ormadis-s Underground prefabricated transformer substations

Transcription

1 Underground prefabricated transformer substations General Instructions IG-209-EN, version 01; 18/03/2013

2 Legal Deposit: BI-0088/2013 CAUTION! When Medium Voltage equipment is operating, certain components are live, other parts may be in movement and some may reach high temperatures. Therefore, the use of this equipment poses electrical, mechanical and thermal risks. In order to ensure an acceptable level of protection for people and property, and in compliance with applicable environmental recommendations, Ormazabal designs and manufactures its products according to the principle of integrated safety, based on the following criteria: Elimination of hazards wherever possible. Where elimination of hazards is not technically or economically feasible, appropriate protection functions are incorporated in the equipment. Provision of information on remaining risks to facilitate the design of operating procedures which prevent such risks, training for the personnel in charge of the equipment, and the use of suitable measures for personal protection. Use of recyclable materials and establishment of procedures for the disposal of equipment and components so that once the end of their service lives is reached, they are duly processed in accordance, as far as possible, with the environmental restrictions established by the competent authorities. Consequently, the equipment to which the present manual refers complies with the requirements of section 11.2 of the forthcoming IEC standard It must only be operated by qualified and supervised personnel, in accordance with the requirements of standard EN on the safety of electrical installations and standard EN on activities in or near electrical installations. Personnel must be fully familiar with the instructions and warnings contained in this manual and in other recommendations of a more general nature which are applicable to the situation according to current legislation State Gazette BOE 269, dated 10 November, and the update in accordance with R.D. 54/2003). The above must be carefully observed, as the correct and safe operation of this equipment depends not only on its design but also on general circumstances which are in general beyond the control and responsibility of the manufacturer. More specifically: The equipment must be handled and transported appropriately from the factory to the place of installation. All intermediate storage should occur in conditions which do not alter or damage the characteristics of the equipment or its essential components. Service conditions must be compatible with the equipment rating. The equipment must be operated strictly in accordance with the instructions given in the manual, and the applicable operating and safety principles must be clearly understood. Maintenance should be performed properly, taking into account the actual service and environmental conditions in the place of installation. The manufacturer declines all liability for any significant indirect damages resulting from violation of the guarantee, under any jurisdiction, including loss of income, stoppages and costs resulting from repair or replacement of parts. Guarantee The manufacturer guarantees this product against any defect in materials and operation during the contractual period. In the event that defects are detected, the manufacturer may opt either to repair or replace the equipment. Improper handling of this equipment and its repair by the user shall constitute a violation of the guarantee. Registered Trademarks and Copyrights All registered trademarks cited in this document are the property of their respective owners. The intellectual property of this manual belongs to the manufacturer. In view of the constant evolution in standards and design, the characteristics of the elements contained in this manual are subject to change without prior notification. These characteristics, as well as the availability of components, are subject to confirmation by Ormazabal s Technical - Commercial Department.

3 General Instructions Contents 3 CONTENTS 1 Description and main characteristics components Prefabricated monoblock concrete enclosure Associated-type compact equipment assembly Name plate Mechanical characteristics Transport Road transport Location of accessories during transport Storage 8 4 Installation Location Planning Personnel required Ground preparation Excavation dimensions Base concreting Levelling process Excavation Drawings Handling the Handling the associated type compact equipment assembly Extraction and seal of the roof Handling the associated-type compact equipment assembly Location and fill-in Rainwater drainage Access and seal of Medium Voltage cables Access to the Medium Voltage and low voltage cable inspection chamber Medium voltage cable connection Low voltage cable connection Earthing circuit Protective Earthing Operational Earthing Earthing network Recommended sequence of operations Remote local operation Medium Voltage feeder operation Disconnection of Medium Voltage switch for transformer protection Manual local operation Operating level Manual operation of the feeder functional unit Manual operation of the protection functional unit Voltage presence indicator Checking voltage presence and phase balance Access to the low voltage board cabinet Voltage presence indicator Opening of single-pole disconnector of CBTO-C Closing the single-pole disconnector of the CBTO-C Operation of transformer tap control Access to the Medium Voltage cable compartment Connection of a generator set prior to zero switching Smart Distribution Management Trip, parametrisation and display log for the ekorsafe safe integral protection unit ekorsafe unit settings and display via WEB page Display of reason for trip of ekorsafe safe integral protection: Front LED Connection to the ekorsafe safe integral protection unit Commissioning Replacing the associated-type compact equipment assembly Maintenance Medium Voltage cubicles Testing of the voltage presence indication unit Distribution transformer General criteria Precautions Review of status of dielectric fluid Overheating Cleaning: flooding Additional information Sizing diagram Oil collection device Pump connection device Accessories included Environmental Information. Recyclability Waste from the enclosure Waste from the Medium Voltage switchgear Low voltage distribution board Distribution transformer immersed in dielectric fluid

4 4 Description and main characteristics General Instructions 1 Description and main characteristics The Ormazabal is an underground Transformer Substation, non-walk-in type, for use in public distribution networks of up to 36 kv, and it may contain a transformer with a power rating of 250, 400, 630 or 1000 kva. The Transformer Substation has been designed to meet the requirements of the following standards: 1.1 components is an associated-type Transformer Substation of reduced dimension, ready for installation on-site, factory-tested, supplied and transported as as single functional unit. Standards IEC IEC IEC IEC IEC UNE EN IEC IEC IEC IEC IEC IEC Description Common specifications for High Voltage switchgear and controlgear standards. Alternating current metal-enclosed switchgear and controlgear for rated voltages above 1 kv and up to and including 52 kv. Alternating current disconnectors and earthing switches. Alternating current switch-fuse combinations. High voltage/low voltage prefabricated transformer substations. Associated-type compact equipment assembly for transformer substations (CEADS) High voltage switches for rated voltages above 1 kv up to and including 52 kv. Degrees of protection provided by enclosures. Voltage presence indicating systems. Low voltage equipment assemblies. Power Transformers Current-limiting fuse-links 1 DEHA-type lifting system (*) 2 Prefabricated reinforced concrete underground enclosure 3 Remote control cabinet 4 Removable roof 5 Ventilation grille 6 Access chamber to distribution transformer tap changer 7 Access door to cable compartment of the Medium Voltage cubicles 8 Manually-operated door to Medium Voltage cubicle 9 Low voltage board cabinet 10 Associated-type compact equipment assembly 11 Medium voltage and low voltage cable inspection chamber (*) DEHA: HALFEN-DEHA, S.L transport anchor system. Fig. 1.1: main components Prefabricated monoblock concrete enclosure The prefabricated concrete building consists of a prefabricate concrete enclosure with a removable roof. The prefabricated concrete enclosure has two compartments, one for the associated-type compact equipment assembly and the other which serves as a chamber for the medium and low voltage cables. Above the cable chamber there are two cabinets. One contains the low voltage board for public distribution and the other houses all the electronic elements corresponding to the.

5 General Instructions Description and main characteristics 5 The roof has horizontal ventilation grilles and separate accesses to the manual operation compartment of the medium voltage cubicle, to the medium voltage cable compartment and to the distribution transformer unit compartment Associated-type compact equipment assembly An associated-type compact equipment assembly is installed inside the enclosure and contains the following elements: 1.2 Name plate Each has a name plate, located in a visible position on the inside of the enclosure, which indicates, in a clearly legible and permanent manner, the following data: MANUFACTURER: Ormazabal DESIGNATION: xxxx kva, xx kv CATALOGUE REFERENCE: SERIAL NUMBER: XXXX-XXXXX(*) STANDARD: EN YEAR OF MANUFACTURE: XXXX DETAILS OF TRANSFORMER, ETC. (*) In the event of incident, the serial number should be quoted to Ormazabal. 1 Medium / low voltage distribution transformer, in accordance with IEC immersed in dielectric fluid with hermetically sealed, integral filling technology up to 1000 kva / 36 kv. Interconnection of low voltage cables: 3x4+1x2 of 240 mm 2 XZ1 0.6/1 kv. 2 Direct interconnection of screened and inaccessible single-pole medium voltage, ormafuse. 3 Compact medium voltage SF 6 fully insulated cubicle up to 36 kv, 400/630 A, in accordance with the IEC standard. 3a Medium voltage cable compartment and protection compartment 3b BR-A driving mechanism for transformer protection function 3c BM driving mechanism for feeder functions 4 Reinforced concrete monoblock floor 5 DEHA-type lifting system Fig. 1.2: associated-type compact assembly equipment Fig. 1.3: name plate

6 6 Description and main characteristics General Instructions 1.3 Mechanical characteristics The dimensions and weights of the family are as follows: Dimensions Total Exterior cabinets Length [mm] 5,460 1,000 Depth [mm] 2, Total Height [mm] 3,100 - Underground [mm] 2,000 - Visible height [mm] 1,100 1,100 Fig. 1.4:Dimensions of (units in mm) Weight Power (kva) Compact equipment (kg) 3,430 3,573 4,058 4,621 Roof [kg] 3,050 Total (t) Not including floor. Pressure on ground 0.3 kg/cm 2. For further information, see section 7.1.

7 General Instructions Transport 7 2 Transport 2.1 Road transport Transport should be in a low loader truck with a platform height of less than 0.9 m. In this case, a special transportation permit is not required. The application for permits and planning of the route without overhead obstacles must be prepared in advance. The total height of the transport ranges between 4 m in a low loader truck to 4.50 m on a platform. During transport, the must be firmly secured to the truck bed using the four DEHA inserts designed for the lifting process. Two wooden boards, measuring 15 mm thick x 100 mm wide x 2500 mm long, should be inserted between the base of the prefabricated concrete enclosure and the truck bed at the height of the DEHA inserts. During transport the covers on the cable chambers should be secured to prevent their fall during transport. 2.2 Location of accessories during transport Depending on the mode selected, is supplied with the following: Ormazabal's IG-209 General Instructions Document Low voltage board control diagram General Instructions for the selected remote control and automation units. Manual operating lever for the driving mechanisms of the Medium Voltage cubicles. Manual operating lever for the disconnection mechanism of the low voltage board. Access key to the manual operation covers of the Medium Voltage cubicles, access cover to the Medium Voltage cable compartment and access chamber to the transformer tap changer. Access keys to the remote control and low voltage board cabinets.

8 8 Storage General Instructions 3 Storage No special measures are required for storing the. The floor on which it is stored should be even. At least two wooden boards, measuring 15 mm thick x 100 mm wide x 2500 mm long, should be inserted between the base of the prefabricated concrete enclosure and the floor at the height of the DEHA inserts. The must be stored so as to prevent rainwater or sunlight from falling directly onto the compact equipment. Do not store in harsh environments. Storage temperature: Maximum +55 ºC Minimum - 15 ºC Maximum height above sea level: 1000 m Fig. 3.1: Conditions for the storing of ATTENTION Do not store in corrosive or saline environments

9 General Instructions Installation 9 4 Installation When installing in its location, local standards and legislation must be met. The instructions listed in this document must be observed. The site must be visited in advance to check vehicle access and whether there is sufficient space for unloading operations, taking into account the distances to overhead lines, slopes, etc. (see figura 4.1). 4.1 Location The exact site must be defined, indicating alignment levels and the height to reference points, level 0, finish of surrounding area, rainwater outlets and the position of the access covers. The position of should be considered prior to installation to ensure correct medium and low voltage cable entry. See section On the location sketch or drawing, mark out the spaces available for the crane and the transport truck. Pay special attention to the position of the crane to ensure the support jacks are not too close to the excavation, which could lead to collapse. The support jacks shall be more than 3 m from the excavation. The existence of any circumstance or object that could impede or obstruct the smooth operation of the installation must be indicated (posts, cables, ditches, walls, pipelines, etc.), marking their positions on the drawing with the corresponding measurements. 4.3 Personnel required Depending on the conditions of the excavation, the assembly manager shall decide on the personnel required for the work to be completed correctly. 4.2 Planning 4.4 Ground preparation Excavation dimensions See section 4.6. Fig. 4.1: Download operation Power rating of the cranes* Weight**] t 5 m 6 m 7 m 8 m 9 m 10 m (*) The power rating is in t at 3 m. (**) Weight with 1000 kva transformer. Tab. 4.1: Maximum distance D for self-propelled crane tabla 4.1 shows the recommended values for the different crane power ratings, remembering that these are provided as a guide and each individual case should be confirmed with Ormazabal. The floor plan dimensions of the excavation will depend on the ground.. The specific applicable national regulations regarding health and safety on construction sites must be observed during the excavation work. The following should be remembered: Before starting the excavation, conduct a preliminary study of the ground to establish its stability and the possible existence of conduits. Avoid accumulating excavated material and equipment at the edge of the excavation, taking the necessary precautions to prevent the walls from caving in and materials from falling into the hole. As a general rule, an area around the excavation of approximately 3 m in diameter should be kept free of loads and traffic. When the excavation is equal to or deeper than 2 m, protect the crown edges with a regulatory handrail.

10 10 Installation General Instructions In the case of rain and puddles, carefully inspect the excavation using qualified technicians before resuming the work. Carry out immediate pumping out of water that may be present inside the excavation in order to prevent the stability of the slope from being altered. At least one step-ladder must be provided per work team. This ladder should protrude above the edge of the excavation by 1 m. Engine driven machines that generate gases such as CO must not be placed inside the excavation unless adequate equipment is used to extract the gases. The operators that work inside the excavation must be properly trained and informed and must use a safety hat as well as the appropriate protective clothing for each specific hazard. Recommendations for the slope of the embankment depending on the nature of the ground are listed below: Type of ground Excavations in virgin soil or very old homogeneous embankments Angle to horizontal Slope Hard rock 80º 5/1 Soft or cracked rock 55º 7/5 Rubble, rocky or stony 45º 1/1 Strong soil (mix of sand and clay) with stone and vegetable matter Recently dug or recent embankments 45º 1/1 35º 7/ Base concreting To ensure a correct level, reinforcement of the base of the and distribution of electrical earthing, the base of the excavation must be concreted as indicated in the attached plans, leaving 4 iron rods visible on the surface for connection to the metallic parts earth. The concrete should be 0.2 m thick (approximately 2.8 m 3 of concrete). The mesh should be made of 100 x 100 mm squares made of iron wire with a cross-section of 8 mm 2. Approximately 50 mm should be respected for subsequent levelling and settling of the sand filling. 4.5 Levelling process The final level 0 must be defined in advanced before this operation and those of subsequent sections can be performed. Quantity See section 4.6. Recommended Equipment 1 Spirit level. 1 Square-end spade 8 Levelling tools 1 5 m ladder ATTENTION Poor levelling may result in the break of the base of, with the resultant entrance of water.

11 General Instructions Installation Excavation Drawings Fig. 4.2: excavation drawings

12 12 Installation General Instructions 4.7 Handling the The ormadis_s Transformer Substation has a number of DEHA inserts which enable it to be handled using the proper lifting beam, slings and hooks in order to guarantee a hoisting as balanced as possible. The standardised slings measuring 5.1 m long with a DEHA-type head for a load group of t include the extensions, a simple ring measuring 200 mm long and a simple ring with a PVG connection (on two of the slings). Therefore there are 3 measurements: 5.1, 5.3 and 5.43 m with which it is possible to ensure the balanced lifting of the. Fig. 4.3: Correct coupling method using DEHA hooks 1 Lifting beam, BEZABALA type, 35 t. 2 Slings measuring 5.1 m length with a DEHA-type head for load group t. Fig. 4.4: hoisting process 4.8 Handling the associated type compact equipment assembly Extraction and seal of the roof If it is necessary to replace the associated-type compact equipment assembly, the following points should be considered to ensure the correct handling and seal of the roof: The four eye-bolts for handling the roof are included in the low voltage board cabinet. The materials required for sealing the roof (Roundex rubber and Lanco sealant) are available as spares and accessories. Please contact Ormazabal. Remove the sealant and the rubber from the edge of the roof using a sharp tool (cutter, electrician's knife, etc.) so that it can be easily removed. Disconnect the earth connection located on the cover of the access to the transformer tap changer (see Figure 4.11). Screw the four eye-bolts supplied with into the holes designed for this purpose and continue with the extraction. Roof weight kg Check that the rubber profile used to support the roof is intact and complete. This is important in order to ensure a correct seal. Proceed with the handling of the compact equipment as indicated in section On completion of the handling, replace the concrete roof in the same position, making sure that the rubber seal is in good condition and there is no dirt or grit preventing the roof from fitting correctly. Insert the Roundex rubber profile into the gap between the perimeter wall of the roof and the enclosure, pressing it into the groove in order to adjust it. Using a putty knife, cover the gap around the roof using Lanco sealant as evenly as possible and trying to leave as little porosity as possible in order to compact the rubber and the sealant and to ensure it is correctly attached to the sides of the profile.

13 General Instructions Installation Handling the associated-type compact equipment assembly The ormadis_s associated-type compact equipment assembly has a number of DEHA inserts which allow it to be handled using the proper lifting beam, slings and hooks in order to guarantee a hoisting as balanced as possible. When handling the compact equipment the universal DEHA-type hook should be installed, reference: /2.5 to the standardised slings measuring 5.1 m long with DEHA-type head for load group t as indicated in the figure below. The slings include the following components: Extensions Simple ring measuring 200 mm long Simple ring with PVG connection (on two of the slings) Therefore there are 3 measurements: 5.1, 5.3 and 5.43 m with which it is possible to ensure the balanced lifting of the compact equipment. 4.9 Location and fill-in The earthing ring must be made before starting this operation. See section Once the is in position and on completion of the levelling on the concrete slab, the excavation should be filled in to the level of the cable entries. Gravel, sand, soil or similar, or even «lean» concrete (FCK 140 kp/cm 2 type or similar) can be used for the fill. Approximately 24 m 3 will be required, depending on the excavation Rainwater drainage A rainwater drainage system should be connected to the water outputs in the ventilation chambers. Connection to the rainwater drainage system must be made when placing the in the excavation. The connection level is m from the zero level. The rainwater drainage pipe from the ventilation chambers has a diameter of 90 mm. See section 4.6. This connection should prevent the possibility of the water returning to the along the rainwater drainage system. If this is difficult to achieve, a non-return valve, a water collection well or other similar device should be fitted. The can be supplied with the non-return valves installed on request. If necessary, these can be removed by accessing the ventilation chambers through the grilles. Materials and dirt accumulated in the bottom of the rainwater drainage chambers must be regularly removed. 1 Lifting beam, BEZABALA type, 35 t. 2 Slings measuring 5.1 m length with a DEHA-type head for load group t. 3 ormadis equipment floor handling Kit (DEHA universal head / safety hook and double joint) Fig. 4.5: Lifting equipment for the associated type compact equipment assembly

14 14 Installation General Instructions 4.11 Access and seal of Medium Voltage cables The enclosure containing the associated-type compact equipment assembly has two holes for the entrance and exit of the Medium Voltage cables and six holes for the exit of the low voltage cables towards the cable chamber. The Medium Voltage feedthroughs are supplied closed. The low voltage feedthroughs are supplied with the low voltage interconnection to the low voltage board prepared and sealed at the factory. To seal the Medium Voltage cables correctly, proceed as follows: 1) Select the best entrance to the cable chamber and push the cable as far as the selected feedthrough. 1 Low voltage feedthrough 2 Medium Voltage feedthrough 3 Cable chamber Fig. 4.6: Location of cable entry 2) Cut off the corresponding lugs at the cut-off line, according to the diameter of the cable. For easier identification, each lug has the corresponding diameter printed on it. 1 Bushing 2 Clamp 3 Medium Voltage Cable 4 Cut-off line Fig. 4.7: Details of the Medium Voltage feedthrough The attached table shows the diameters of the cables with reticulated polyethylene insulation or ethylene propylene for standard third class type A or B networks: Medium Voltage CABLES 12 / 20 kv Crosssection [mm 2 ] [mm] cut-off [mm] Medium Voltage CABLES 18 / 30 kv Crosssection [mm 2 ] [mm] cut-off [mm] (*) 50 mm2 insulated earthing cable to be used always when cable is run outdoors. Tab. 4.2: Cable diameters for third class networks 3) Insert the corresponding "non-ferrous" stainless steel clamp (supplied with the kit) and then insert the cable. 4) Close the clamp in the position indicated in figura 4.7 (behind the notch). 5) Should the feedthrough be accidentally cut in the wrong place, please contact Ormazabal. The Medium Voltage feedthrough can be replaced on site. ATTENTION Do not use polyurethane foam or any other type of sealant Access to the Medium Voltage and low voltage cable inspection chamber The insulated cable underground feeders comply with that indicated in ITC-LAT-06. The insulated cables are normally laid directly underground or in casings. has an inspection channel, with an interior width of 600 mm, for the connection and output of the Medium Voltage and low voltage cables. The inspection channel has three layers of concrete. On request, the concrete covers can be supplied with cast iron covers that are easier to handle to improve access the cable chamber. The inspection channel forms part of the concrete enclosure. This has entrances for casings measuring Ø 200 mm. These entrances are pre-broken and designed to take casings with a diameter of 200 mm, or the casing can be inserted in the channel up to a diameter of 160 mm. The drawings in figura 4.8 show the points at which the entrances to the inspection channel have been pre-broken.

15 General Instructions Installation 15 1 Medium Voltage cable input / output or low voltage cable output 5 Emergency supply access 2 Medium Voltage cable input/output 6 Low voltage cable access chamber 3 Low voltage cable output 7 Medium Voltage cable access chamber 4 Medium Voltage cable input / output or low voltage cable output Fig. 4.8:Layout of cable inputs and outputs on inspection channel

16 16 Installation General Instructions Medium voltage cable connection The Medium Voltage cable connection in the input and output feeder functions is designed for three single-pole dry cables with synthetic insulation and a cross-section of up to 240/16 mm 2 and a rated voltage of 18/30 kv. The Medium Voltage cables on the input and output feeder functions must be connected through a horizontal front connection with interface for threaded C-type removable connector, in accordance with the CENELEC EN and EN standards, according to the procedure specified below: 1) Connector to the earthing switch as shown in section 5.2 2) Access the Medium Voltage cable compartment, as shown in section ) Remove the cover of the cable compartment as indicated in section ) Connect the terminals on the front bushings and secure the cables using the cable support and clamp. 5) Connect the terminal earth connectors, if applicable, and the cable screen earth connectors in accordance with the manufacturer's instructions. 6) Seal the cables as indicated in section ) Put the cable compartment cover back in place. Dry Make Medium Voltage Cable Type Crosssection [mm²] Protection EUROMOLD KM-400TB Screened EUROMOLD KM-400TB Screened PRYSMIAN MSCT Screened PRYSMIAN MSCT Screened Tab. 4.3: Recommended interfaces for type C threaded connector up to 36 kv (630 A) This list is not exhaustive, and CENELEC terminations are usually valid. For other terminations, please contact Ormazabal Low voltage cable connection The phase output of each of the size 2 BTVC-2-type bases of the low voltage board in the low voltage board cabinet uses the screws on the underside of the three-pole bases. The tightening torque for the electrical connections is set in the following table: Fig. 4.9: BTVC output connections 4.12 Earthing circuit has an internal earthing circuit to facilitate the connection of the different elements to the earthing circuit external to the Transformer Substation. There are two earth disconnection boxes inside the low voltage board cabinet enclosure. These are for the: Protective earthing circuit (metal part earthing). Metric Tightening Torque [Nm] 8.8 Steel A2 Stainless M12 56 M10 32 Tab. 4.4: Tightening torque for electrical connections Operational earthing circuit (transformer neutral earthing). A disconnection box may be provided if it is necessary to join both earthing circuits, the protective earthing circuit and operational earthing circuit. If both earthing circuits are linked due to maintenance work and/or operations, on completion of this work, the circuits should be returned to the state they were in prior to the work.

17 General Instructions Installation 17 Fig. 4.10: Optional disconnection box for earth disconnection Protective Earthing The protective earthing circuit (metallic parts earth) uses a bare copper wire with a cross-section of 50 mm 2. The protective earth connects the following components: Low voltage board cabinet enclosure Remote control cabinet enclosure Associated-type compact equipment assembly Roof (in the event of insulated roof, this connection is not made) Enclosure body Medium Voltage cubicles Medium voltage cable display Distribution transformer This protective earthing circuit (metallic parts) is connected to the protective disconnection box that is fitted on the inside of the low voltage board cabinet of the, to the left of the door to the low voltage board. The torques to be observed are as follows: TIGHTENING TORQUE [Nm] METRICS 8.8 Steel A2 Stainless M8 21 M10 32 M12 56 Tab. 4.5: Protective earthing circuit tightening torques 1 Metallic parts earth disconnection box 2 Neutral disconnection box 3 Metallic parts earth 4 Low voltage board neutral earth 5 Low voltage board cabinet earth 6 earth collector 7 Remote control cabinet earth 8 Associated-type compact equipment assembly earth 9 Associated-type compact equipment assembly earth collector 10 Medium Voltage cubicle earth 11 Removable roof earth 12 Concrete enclosure earth Fig. 4.11: Earth Circuit Fig. 4.12: Protective disconnection box

18 18 Installation General Instructions Operational Earthing The operational earthing line (neutral) connects the LVB neutral busbar to its disconnection box fitted inside on the right side of the low voltage board cabinet. This connection is made using an insulated copper cable of 0.6/1kV with a cross-section of 50 mm 2. The protective and operational earthing connections can be made on site once the characteristics of the ground and the operating conditions of the Transformer Substation have been determined. TIGHTENING TORQUE [Nm] METRICS 8.8 Steel A2 Stainless M8 21 M10 32 M12 56 Tab. 4.6: Operational earthing circuit tightening torques Fig. 4.13: Operational Disconnection Box WARNING The neutral bar on the low voltage board is not connected to the protective earth connection bar (metal parts). The protective earthing circuit and the operational earthing circuit are independent. The copper braided wire cross-section, the terminations' contact surface and tightening torques must be suitable for a fault current delimited by network protections Earthing network The following elements should be used for the installation of the protective earth connection electrode (metallic parts) in : A perimeter ring at the base of the excavation at a distance of approximately 0.4 m with respect to the perimeter of the concrete enclosure of. This perimeter ring must be connected to the bottom plate at the bottom of the excavation at a minimum of two points. Another perimeter ring at a distance of 1 m from the perimeter, at -0.8 m from the zero level. Both rings must be connected together using bare copper cable and the 2 rings are connected to the protective earthing point (in the corresponding disconnection box) of. Bare copper cable with a cross-section of 50 mm 2 is recommended for the protective earthing circuit, including the electrode. figura 4.14 is a diagram of the recommended configuration of the external earthing network: The Transformer Substation project must include a section corresponding to the earthing installation (check the Utility's standard project), as well as a justification of its size. The requirements for this type of installation are established in the section on Earth Connection Installations in the Spanish Regulations on Power Plants, Substations and Transformer Substations. Adequate earthing measures around the Transformer Substation must be provided to prevent dangerous touch and step voltages.

19 General Instructions Installation 19 Fig. 4.14:Recommended external earthing network (measurements in mm)

20 20 Recommended sequence of operations General Instructions 5 Recommended sequence of operations All operations and accesses recommended in this specification must comply with the procedures indicated by the Utilities, and the electrical safety regulations including National Regulations governing Electricity Power Plants, Substations and Transformer Substations, the Electrotechnical Regulation for low voltage and the minimum national provisions for the protection of workers' health and safety from the risk of electrical shock. 5.1 Remote local operation The remote local operation of the medium voltage feeder switches is by accessing the remote local operation and status panel located in the remote control cabinet. Access to the remote control cabinet is from level zero. The door is fitted with an Ormazabal-type lock which can be encoded. The door is locked at two points. If is remote controlled, it will also have a change-over switch to select local operation or remote operation. The default setting is remote control. if performing a remote local operation from the remote control cabinet, in accordance with owner procedures, this should be changed to local operation Medium Voltage feeder operation Access to the push-buttons for the opening and closing operations has a cover which can be locked with a padlock. For other types of lock, please contact Ormazabal. The procedure for the operation is as follows: 1) Open the door to the remote control cabinet. Fig. 5.2: Opening and closing operation push-buttons Fig. 5.1: Access to the remote control cabinet 2) Lock the door 3) Cordon off the area. Fig. 5.3: Location of remote local control panel WARNING Operators must be suitably trained and qualified and equipped with the correct personal protective equipment for the operation in question Disconnection of Medium Voltage switch for transformer protection The transformer unit medium voltage can be disconnected from the same remote control cabinet panel by pressing the push-button. This push-button can be locked with a padlock. The power fuse protection switch is connected to the transformer unit manually as indicated in section

21 General Instructions Recommended sequence of operations Manual local operation The manual local operation of the switches is by opening the access cover to the driving mechanisms and following the procedure established by the Utility. To open the local operation cover: 1) Turn the square-headed screw anti-clockwise using the Ormazabal wrench supplied. The opening of the cover is gas-spring assisted. 2) Once the lock has been unlocked, the cover opens approximately 10 mm to permit manual elevation. Fig. 5.4: ATTENTION In low ambient temperatures this distance may be lower. In high ambient temperatures, caution is recommended as it is possible that once the cover has been unlocked, it will open fully without requiring manual assistance. Opening local operation cover Once the cover is open, it is necessary: 3) To interlock it using the mechanism provided for this purpose 4) To cordon off the area. WARNING Operators must be suitably trained and qualified and equipped with the correct personal protective equipment for the operation in question. To correctly close the cover, proceed as above but in reverse order. Special attention should be given to ensuring the seal is in good condition and no foreign objects or dirt have entered in the groove of the lock. Once the manual operation cover has been opened and correctly interlocked, prior to performing any operation and in accordance with the procedures of the Utility, proceed as follows: Confirm that the equipment and elements required for the operation are to hand. If the is remote controlled, check that the remote control cabinet change-over switch is set to local operation. Check that manometer for the function to be operated shows the correct reading (please refer to the corresponding general instructions document) The opening and closing operations of the earthing switches for the protection and feeder functions to the transformer must be carried out in accordance with the procedures of the Utility Operating level The operating lever is located below the access cover to the driving mechanisms. WARNING For safety reasons, maintenance operations performed directly on the driving mechanism must be performed WITHOUT any actuating lever inserted. This lever is used for performing closing (I) and opening (O) operations in the switch/disconnector respectively, without exceeding the medium voltage cubicle's manoeuvring limits. Fig. 5.5: Driving mechanism lever

22 22 Recommended sequence of operations General Instructions Manual operation of the feeder functional unit To perform this operation, it is necessary to access the driving mechanism compartment as indicated in the introduction to section 5.2. If the is remote controlled, before starting manual operations, check that the remote control cabinet change-over switch is set to local operation. Opening Operation from the Earthing Position 1) Insert the lever in the actuating shaft of the earthing switch (yellow zone) and turn it anticlockwise. Fig. 5.8: Turn lever clockwise 2) Remove the lever. 3) Check that the functional unit is in the connected position. Fig. 5.6: Turn lever anti-clockwise 2) Remove the lever. 3) Check that the functional unit is in the disconnected position. Fig. 5.9: Feeder function in connected position Opening Operation from the Switch-Disconnector Closed Position 1) Insert the lever in the actuation shaft of the switch-disconnector (grey area) and turn it anticlockwise. Fig. 5.7: Feeder function in disconnected position Connection of the switch-disconnector from the disconnected position 1) Insert the lever in the switch-disconnector actuation shaft (grey area) and turn clockwise. Fig. 5.10: Turn lever anti-clockwise

23 General Instructions Recommended sequence of operations 23 2) Remove the lever. 3) Check that the functional unit is in the disconnected position. Fig. 5.11: Feeder function in disconnected position Earthing Operation from the Open Position 1) Insert the lever in the actuating shaft of the earthing switch (yellow zone) and turn it clockwise. Fig. 5.13: Feeder function in the earthing position Manual operation of the protection functional unit To perform this operation, it is necessary to access the driving mechanism compartment as indicated in section 5.2. Opening Operation from the Earthing Position 1) Insert the lever in the actuating shaft of the earthing switch (yellow zone) and turn it anticlockwise. Fig. 5.12: Turn lever clockwise 2) Remove the lever. 3) Check that the functional unit is in the earthing position. Fig. 5.14: Turn lever anti-clockwise 2) Remove the lever. 3) Check that the functional unit is in the disconnected position.

24 24 Recommended sequence of operations General Instructions Fig. 5.15: Protection function in disconnected position Connection of the switch-disconnector from the disconnected position (with BR-A mechanism) 1) Insert the lever in the switch-disconnector actuation shaft (grey area) and turn clockwise. In the same turn, the switch-disconnector is closed and the retaining springs are charged. This operation requires more effort than the operations in the feeder function. Fig. 5.17: Protection function in connected position Opening Operation from the Switch-Disconnector Closed Position 1) Open manually using the push-button located on the front of the cubicle. Fig. 5.16: Turn lever clockwise 2) Remove the lever. 3) Check that the functional unit is in the connected position. Fig. 5.18: Turn lever anti-clockwise 2) Check that the functional unit is in the disconnected position. Fig. 5.19: Protection function in disconnected position

25 General Instructions Recommended sequence of operations 25 Earthing Operation from the Open Position 1) Insert the lever in the actuating shaft of the earthing switch (yellow zone) and turn it clockwise. The voltage detection unit has the following displays: Fig. 5.20: Turn lever clockwise 2) Remove the lever. 3) Check that the functional unit is in the earthing position. Fig. 5.21: Protection function in the earthing position 5.3 Voltage presence indicator Ormazabal uses the ekorvpis unit for the voltage presence indication. This unit has been designed in accordance with the UNE-EN standard. Therefore, the voltage presence indication is displayed when the phase-earth voltage is equal to or greater than 45% of the rated voltage and is not visible when the phase-earth voltage is less than 10% of the rated voltage. This unit provides a clear visual indication for the user, without needing an auxiliary power supply for its operation. For each of the three phases, the presence of voltage is indicated by intermittent flashing of the indicators. 1 L 1, L2 L3 Display each of the indicator phases The numbering corresponds to the order of the phases, from left to right, seen from the front of the cubicle. Each phase has a test point for checking the phase balance between cubicles. 2 Voltage presence indicator A flashing light indicates the presence of voltage in that phase. 3 Phase test points Each phase has a test point for checking the phase balance between cubicles. 4 Earth test point This is only used for comparing the phases. Fig. 5.22: ekorvpis voltage presence indicator unit. The purpose of the test points for the three phases and earth is to make it easier to check the phase balance between cubicles. Ormazabal's specific phase comparator ekorspc can be used to do this. WARNING With the ekorvpis, if the indicators do not light up, use other means to check that there is no voltage.

26 26 Recommended sequence of operations General Instructions 5.4 Checking voltage presence and phase balance To perform this operation, it is necessary to access the driving mechanism compartment as indicated in section 5.2. Ormazabal's ekorspc phase comparator should be used for checking that the Medium Voltage cables are correctly connected to the feeder cubicles. For further information about the ekorspc unit, please see the Spares and Accessories Instructions, RA-111. Optionally, other comparison devices which comply with the IEC standard may be used. Fig. 5.25: ekorspc unit 1) Remove the mimic diagram located on the mechanisms by undoing the four fastening bolts using an adjustable wrench. Fig. 5.26: Connection of the ekorspc unit Fig. 5.23: Remove mimic diagram 2) Unscrew the protective box for the ekorvpis unit. 1 Comparison of balanced phases There is NO indication on the comparator 2 Comparison of unbalanced phases There is an indication on the comparator Fig. 5.27: Phase comparator display on the ekorspc unit Fig. 5.24: Remove protective box Connect the red cables of the ekorspc unit to the corresponding phase test points on the ekorvpis units, and the black cable to the earth test point. This operation must be repeated for all the phases: L1, L2 and L3 ATTENTION On completion of the phase comparison, replace and screw back the protection box for the ekorvpis units, applying a torque of between 4 and 6 Nm, making sure that the seal is correctly fitted on the box, guaranteeing the seal of the ekorvpis units.

27 General Instructions Recommended sequence of operations Access to the low voltage board cabinet Access to the low voltage board cabinet is from level zero. The door is fitted with an Ormazabal-type lock which can be encoded. The door is locked at two points. For other types of lock, please contact Ormazabal. 3) Using the operating tool, open the poles of the disconnector one after the other starting at the top and working downwards. To open each pole, insert the tool in the pole through the upper opening as far as possible and pull the tool downwards, then remove the tool through the lower opening. Repeat the operation for each pole. 1) Open the door to the cabinet. Fig. 5.28: Access to the low voltage board cabinet 2) Lock the door 3) Cordon off the area. WARNING Operators must be suitably trained and qualified and equipped with the correct personal protective equipment for the operation in question. Fig. 5.29: Opening using the operating tool On completion of the operation, replace the operating tool in its position. 4) Confirm the opening of the single-pole disconnector at the test points. WARNING Do not handle the load disconnector. ATTENTION In the event of query or for further information, please contact Ormazabal. The criteria contained in standards UNE-EN and UNE-EN should always be followed when handling the low voltage board Voltage presence indicator The CBTO-C board is fitted with an Ormazabalvoltage presence indicator, downstream of the disconnection and upstream of the BTVC bases Opening of single-pole disconnector of CBTO-C On the left, the CBTO-C has four manually-operated single-pole disconnectors permitting its isolation from the distribution transformer. The operating sequence for opening the disconnector is as follows: 1) Open the Medium Voltage fuse protection switch 2) Check that no voltage is present in the CBTO-C. Fig. 5.30: Check opening of single-pole disconnector Closing the single-pole disconnector of the CBTO-C To close the disconnector, proceed as follows: 1) Check that the medium voltage fuse protection switch is open, or open if necessary (see section 5.2). 2) Check that no current is present in the CBTO-C.

28 28 Recommended sequence of operations General Instructions 3) Using the operating tool, close the four poles of the disconnector one after the other starting at the bottom and working upwards. 10) Cordon off the area. 11) Stand over the cover on the transformer fuse protection switch function. 12) Check that the switch is open (see section 5.2). 13) Check for the absence of voltage in the transformer medium voltage fuse protection switch function. 14) Switch and set the transformer medium voltage fuse protection switch to earth. (see section 5.2) 15) Lock the Earthing Switch. Fig. 5.31: Closing using the operating tool 5.6 Operation of transformer tap control To change the medium voltage tap control of the transformer, first open the access cover to the tap changer and then proceed as indicated by the Utility. WARNING Operators must be suitably trained and qualified and equipped with the correct personal protective equipment for the operation in question. The recommended sequence of operations for changing the position of the tap changer for the Transformer Substation transformer is as follows: 1) Remove energy sources from the Medium Voltage side and from the low voltage side. This should be performed in accordance with RD 614/ 2011, section B.4, non-live work in power transformers. 2) Open the low voltage board cabinet door. 3) Block the door. 4) Cordon off the area. 5) Set the transformer medium voltage protection functional unit switch to disconnected position (see section 5.2). 6) Check for the absence of return voltage along the low voltage feeders. 7) Open the four single-pole disconnectors of the low voltage board connection, starting with the neutral. 8) Open the access cover to the controls of the medium voltage switches (see section 5.2). 9) Block the door. Fig. 5.32: Access cover to the transformer tap changer open 16) Open the access cover to the transformer tap changer. To open the local operation cover, turn the squareheaded screw anti-clockwise using the wrench supplied. 17) Lock the access cover to the transformer tap changer using the mechanism provided for this purpose. 18) Cordon off the area. To close the cover correctly, proceed in the reverse order to the opening procedure. Special attention should be given to ensuring the seal is in good condition and no foreign objects or dirt have entered in the groove of the lock. 19) Unlock and set the tap changer to the required position. Then, lock the tap changer control. 20) Restore service by following the above procedure in reverse order.

29 General Instructions Recommended sequence of operations Access to the Medium Voltage cable compartment WARNING Operators must be suitably trained and qualified and equipped with the correct personal protective equipment for the operation in question. For local manual access to the medium voltage cable compartment, first open the access cover to the medium voltage cable connection and then follow the procedure established by the Utility. To open the medium voltage cable compartment access cover. 1) Turn the square-headed screw anti-clockwise using the Ormazabal wrench supplied. The opening of the cover is gas-spring assisted. Once the lock has been unlocked, the cover opens approximately 10 mm to permit manual elevation. ATTENTION In low ambient temperatures this distance may be lower. In high ambient temperatures, caution is recommended as it is possible that once the cover has been unlocked, it will open fully without requiring manual assistance. 2) Interlock the access cover using the mechanism provided for this purpose 3) Cordon off the area. To correctly close the cover, proceed as above but in reverse order. Special attention should be given to ensuring the seal is in good condition and no foreign objects or dirt have entered in the groove of the lock. After the access cover to the medium voltage cable compartment has been opened and correctly interlocked, the procedure established by the Utility for accessing the medium voltage cable compartment should be followed. The medium voltage cable compartment is interlocked. To unlock it, proceed as indicated in section Connection of a generator set prior to zero switching The low voltage board cabinet has an opening for the entrance of the cables from the generator set measuring 156 mm in diameter and located at a height above the ground of 200 mm. 1 Generator set cable entry Fig. 5.33: View of access for generator set connection To release the cover, it is necessary to access the low voltage board as indicated in section 5.5. The cover is released by unscrewing the thumb nut holding it down. Each pole of the disconnector has two connection points for a generator set. Each of these connection points can take the connection of a cable with a cross-section of up to 240 mm 2 with a compression terminal with a maximum blade width of 36 mm. The connection of the power cable from the auxiliary unit to the disconnector, once the opening of the medium voltage fuse protection switch and the absence of current (momentary interruption of service) in CBTO-C has been confirmed, is as follows: WARNING Working in the vicinity of live voltage. Operation only to be performed by specialised personnel 1) Open the disconnector in accordance with the instructions of section ) Using an insulated M6 Allen key, undo the connection screw to the auxiliary feeder located at the front of the disconnector. 3) Move the connection bolt towards the outside of the disconnector by pulling on the blue plug. 4) Open the cover and insert the cable in the disconnector. 5) Using the insulated Allen key, tighten the bolt to a torque of 32 Nm.

30 30 Recommended sequence of operations General Instructions Fig. 5.34: Tighten bolt using an insulated Allen key To connect the generator set, follow the procedures established by the company conducting the work and the company responsible for supplying the electricity. To connect the generator set, follow the procedures established by the company conducting the work and the company responsible for supplying the electricity. 5.9 Smart Distribution Management The ekorgid Smart Distribution Management Unit combines Telemanagement, Monitoring of low voltage and medium voltage networks and automation, along with its associated communications, in the transformer substations. The ekorgid Smart Distribution Management Unit is located in the remote control cabinet and contains the components required for carrying out the following functions: 1) Telemanagement: Collect and process information from the low voltage customer meters. The STG connection permits the collected and processed information to be sent to the telemanagement System. 2) Monitoring of the low voltage network Measure and process the electrical characteristics of low voltage consumption. 3) Monitoring of the Medium Voltage network Measure and process the electrical characteristics of Medium Voltage consumption, alarms from the Transformer Substation and faults. 4) Automation of the Medium Voltage network 5) Communications: Acts as a communication link between the Dispatching Centre and the corresponding elements for the Monitoring and Automation functions. Fig. 5.35: View of ekorgid in 5.10 Trip, parametrisation and display log for the ekorsafe safe integral protection unit To access the ekorsafe safe protection unit, go to the compartment located in the remote control cabinet. The ekorsafe safe integral protection unit is autopowered and is connected to the low voltage network, directly at 230 V ac or via a safe power system of batteries. In the event of protection operations and the opening of the transformer protection switch, the exterior power supply of 230 V ac is lost. In these cases, if batteries are available (estimated capacity of 48 hours to maintain all electronic equipment on), the equipment will remain on and direct access is possible. However, if the equipment is off, it must be powered using the miniusb connector with a PC, mobile phone, etc. The ekorsafe safe protection unit displays the reason for the trip as a consequence of: Overcurrent (3x50/51/50N/51N (Medium Voltage) & 1x 50N/51N (low voltage) Excess temperature protection in transformer (3x26, Ta) Excess temperature protection (fire) on low voltage board (3x26, Tbt) Internal defect in transformer unit (Fuse TRIP)

31 General Instructions Recommended sequence of operations 31 Loss in level of dielectric fluid in transformer unit (N TRIP) Excess pressure in transformer unit (P TRIP) It also has the following alarms: Power Inversion Protection (32R) Undervoltage protection (3x27) ekorsafe unit settings and display via WEB page Display and settings of protection settings are made online via WEB. It is also possible to collect them in XML format and the settings can be edited on XML files and sent via WEB. Adjustable parameters: P, transformer power. V n, rated line voltage. Utility. Transformer alarm temperature (default setting 85 ºC). Transformer trip temperature (default setting95ºc). Measurement display I1, I2, I3 and IN (Medium Voltage part) InLV (low voltage part) Voltage meter: Transformer and busbar part : measurement V1/V2/V3 Three-phase P and Q. Single-phase P and Q. Measurement of Ta (Temperature of transformer), Tt (Ambient temperature in remote control cabinet) and Tcb (Temperature en low voltage board cabinet) Compound voltages: V12/V23/V31 Arguments of V1, I1, V2, I2, V3, I3 and IN Cos single-phase and three-phase These measurements are collected directly from the compact equipment assembly and are updated every 3 seconds Display of reason for trip of ekorsafe safe integral protection: Front LED In the event of the opening of the medium voltage protection disconnector switch due to a fault, the reason for the trip can be viewed, without needing to connect to the ekorsafe safe protection system, via the front LED of the equipment. The protection trips are logged in these LED. The equipment has 6 LEDS. The operation and meaning of each one is as follows (from top to bottom): LED 6-Red: N/P Trip (Trip due to activation of transformer Level and Pressure contacts) LED 5-Red: Fuse Trip (Trip due to Blown Fuse) LED 4-Red: TRIP (General Trip: This is activated with the action of any of the protections. If at the same time, LED 5 and LED 6 are not lit, the reason for the trip belongs to the overcurrent group.) LED 3 Flashing yellow: Eth.1 (Front): Indicates communication via Front Ethernet (Enabled for LOCAL access). LED 2 Flashing yellow: Eth.2 (Remote): Indicates communication via Rear Ethernet (Enabled for REMOTE access). LED 1 -Two-colour (Green and Red) : OK/Fault: Green: Equipment operating correctly. Red: Equipment operating incorrectly. Off: Equipment off. Status and alarm display: Digital input and output status. Equipment alarms. Download and display registers: Register and display of last 20 faults. Register and display of last 200 events. Register and display of measurement log (200 entries): I1, I2 y I3: maximum and average V1, V2 and V3: Average P and Q: Average Fig. 5.36: LEDs ekorsafe If the LED 1 ON/OFF is not lit this means that the battery supply has run out (minimum 48 hours). In this case, connect a PC, tablet or mobile phone via the miniusb connection to power the ekorsafe system. If LED 5 and/or LED 6 are lit, Ormazabal recommends the replacement of the compact equipment as the transformer unit has an internal defect. If LED 4 is not lit, this means that the order has been given to open either the feeder switches or the transformer protection switch. Check for voltage from the medium voltage grid.

32 32 Recommended sequence of operations General Instructions If LED 4 is lit but neither LED 5 nor LED 6 are lit, the defect should be found and repaired before restoring the service Connection to the ekorsafe safe integral protection unit It is possible to connect to the ekorsafe safe integral protection unit to collect data or change settings using the miniusb connection or via the Ethernet connection. Connection is made via Web server with a PC, data tablet or smartphone. The owner's programme is not required. With the connection via WEB all the equipment information is available including the settings, display or download if the different logs Commissioning 1) Check that the medium voltage supply of the transformer is suitable for the electrical installation project (see name plate and test protocol). 2) Before powering the Transformer Substation, check that the transformer tap changer is set to the correct position (*) and that it is interlocked. In the case of a dual-voltage transformer in Medium Voltage, check that the rated voltage of the transformer corresponds to the service voltage of the mains. The tap changers must always be actuated without voltage in the circuit. (*) Position in which the deviation with respect to the rated voltage is 0 V. 3) Power the medium voltage switchgear (see section 5.2) with the transformer at no-load (fuse holder bases of the low voltage board open). 4) From the low voltage board check the service voltage with the compact equipment connected at no-load to the medium voltage network. Measure the voltage on the low voltage board as indicated, to check the correct connection and position of the tap changer. If the service voltage is incorrect, follow the steps given in section 5.6 until the service voltage on the low voltage board is appropriate. 1 miniusb connector 2 Ethernet connector Fig. 5.37: Front ekorsafe Fig. 5.38: WEB connection via USB Fig. 5.39: WEB connection via front Ethernet