Section S7 - DC and AC auxiliary services installations

Transcription

1 S7/2 Section S7 - DC and AC auxiliary services installations Contents S7. Generalities...3 S7. Generalities...4 S7..1 Scope of work...4 S7..2 Dimensioning the auxiliary services equipment...4 S7.1 General requirements for equipment...5 S7.1.1 Standards...5 S7.1.2 Site specific conditions...7 S7.1.3 Parameters of the DC and AC installation...8 S7.1.4 Nameplates, labels...8 S7.1.5 Protective coatings...9 S7.1.6 Earthing...9 S7.2 General requirements for additional equipment...9 S7.2.1 Motors...9 S7.2.2 Low voltage switches...1 S7.2.3 Low voltage disconnectors...1 S7.2.4 Fuses...1 S7.2.5 Selection and control switches, indicating buttons and lamps...1 S7.2.6 Terminal strips...1 S7.3 Technical requirements for the equipment of DC auxiliary services installation...11 S7.3.1 Generalities...11 S7.3.2 Battery...12 S7.3.3 Rectifier...13 S7.4 Technical requirements for the equipment of AC auxiliary services installation...15 S7.4.1 Generalities...15 S7.4.2 Power transformer...15 S7.4.3 Technical requirements for emergency generating set (Diesel Unit)...16 S7.5 Technical requirements for the DC and AC auxiliary services cabinets...19 S7.6 Tests for DC and AC auxiliary services equipment...21 S7.7 TECHNICAL DATA SHEETS...23

2 S7/3 Table B7 Equipment and materials specification B7/1 B7/3 Table C7 Technical conditions and characteristics required and guaranteed for the equipment Table C7.1 Battery C7.1/1 C7.1/3 Table C7.2 Rectifier C7.2/1 C7.2/6 Table C7.3 Inverter C7.3/1 C7.3/3 Table C7.4 Main DC distribution board C7.4/1 C7.4/3 Table C7.5 Power transformer C7.5/1 C7.5/3 Table C7.6 Emergency generator (Diesel unit) C7.6/1 C7.6/4 Table C7.7 Main AC distribution board C7.7/1 C7.7/3 Table D7 Type, routine and site tests D7 / 1 Table E7.1 Spare parts - Recommended E7.1/1 Table E7.2 Maintenance tools and devices E7.2/1 Table F7 Technical documentation included in the contract F7 / 1 Table G7 Deviations from specifications G7 / 1 Record of document modifications: THE REPRODUCTION, LENDING OR EXPOSURE OF THIS DOCUMENT, AS WELL AS THE TRANSMISSION OF THE INFORMATION IT CONTAINS IS ALLOWED ONLY IN THE CONDITIONS STIPULATED IN THE CONTRACT. EXTRACONTRACTUAL USE REQUIRES THE WRITTEN AGREEMENT OF ISPE

3 S7/4 S7. Generalities S7..1 Scope of work These technical specifications includes the equipment needed for the execution of DC and AC auxiliary services installations of. This project provides modern auxiliary services installations in order to achieve the required safety and the integration of the auxiliary services installations into the substation s management system. The auxiliary services installation will have to meet the dimensioning and reliability requirements imposed by the receptors of the primary and secondary equipment of the substation, in accordance with the standard norms and regulations. This section of Tender book includes the technical requirements for the equipment necessary to accomplish the works related to the auxiliary services installation as followings: - 1 substation battery; - 1 rectifier; - 1 inverter; - 1 auxiliary services transformer; - 22 V DC auxiliary services distribution board; - 4 V AC auxiliary services distribution board; - DC and AC distribution cabinets in the control room; - emergency generating set (Diesel power unit). The inverter will feed computers, printers and other control equipment requiring 23 V, 5 Hz auxiliary voltage. An AC secondary distribution box will be included in the scope of supply. A DC terminal box, installed in the proximity of the battery, will be provided to create a separate feeding for the relay protection group 2. An associated DC secondary distribution box will be included in the scope of supply. S7..2 Dimensioning the auxiliary services equipment The sources of continuous current and alternating current and the supply and distribution boards will be dimensioned and equipped for the 11/3 kv substation final stage (including the spares). The Contractor must verify the capacity of the power supply sources: battery, rectifier, inverter, transformer, Diesel unit and dimensioning of the auxiliary services boards, for the

4 S7/5 consumptions of the substation s equipment and systems and considering the manufacturing tolerances and diversity factors of the installation. The Contractor will take into account that the switches of power supply sources (auxiliary services transformer, Diesel unit, battery, rectifier, inverter) will be controlled both remotely by the substation s control system as well as locally. S7.1 General requirements for equipment S7.1.1 Standards The equipment must meet the requirements of the applicable IEC regulations, the national standards and the attached requirements Table C. The following standards are considered applicable: - SR EN ISO 91:28 - Quality Management Systems. Requirements. - IEC 65(61) - International Electrotechnical Vocabulary. Electricity production, transportation and distribution. - IEC IT testing techniques; - IEC 671-1,2,3 - Coordination of insulation; - IEC Thermal evaluation and classification of electrical insulation; - IEC Climatic tests for equipment; - IEC , 2-2, Classification of environmental conditions; - IEC Selection and dimensioning of H. V. insulators for pollution conditions; - IEC Degrees of protection provided by cases (IP code); - IEC , 22 - plumb acid stationary batteries - sealed valve types; - IEC Semi-conductor converters - General requirements and switching converters; - IEC General common specifications of IT equipment; - IEC HV AC switches; - IEC Disconnectors and HV AC earthing switches; - IEC High voltage alternating current device in metallic tire, for voltages above 1 kv up to 52 kv inclusively; - IEC Prefabricated HV/LV substations; - IEC Current transformers; - IEC Voltage transformers; - IEC Surge arresters;

5 S7/6 - IEC Insulators for alternating voltage higher than 1V; - IEC 676-series - Power Transformers. - IEC Insulating liquids. Measurement of permittivity, dielectric dissipation and DC resistivity factor; - IEC Specification of new insulating oils for transformers and machines; - IEC Marking-out of the terminals and sockets for the power transformers; - IEC Rotating electrical machines; - ISO Alternating current power units operated by internal combustion engines; - ISO Internal combustion engines; - IEC LV device units; - IEC LV device; - EN Electronic equipment used in power substations; - IEC Electrical relays with a single measure input; - IEC Insulation tests for electrical relays; - IEC Measuring relays and protection equipment; - IEC Alternative components and power failures in the supply of electrical relays; - IEC Directional and power relays; - IEC Differential relays; - IEC Impedance measuring relays; - IEC Protection systems; - IEC Vibration tests; - IEC Shock tests; - IEC Seismic Testing; - IEC High frequency interference tests; - IEC Electrostatic discharge tests; - IEC Radiating electromagnetic fields tests; - IEC Fast transient interference tests; - IEC Contacts performance; - IEC Identification of the equipment terminals and general rules for an alphanumeric marking system; - IEC Identification of conductors by colors or numbers; - IEC Coordination of the equipment insulation within low voltage systems; - IEC Codes for color designation;

6 S7/7 - IEC Telecontrol equipment and systems; - IEC Connectors for cables and optical fibers; - IEC 61 - Electromagnetic compatibility; - IEC Preparation of documents used in Electrotechnology; - IEC Identification of systems, industrial installations and equipment; - IEC All-or-nothing electrical relays; - IEC Telecontrol equipment and systems. Standard transmission protocols for basic applications; - IEC Telecontrol equipment and systems. Communication protocols for the transmission of integrated totals in electric power systems; - IEC Communication networks and systems in power substations; - Law no. 68/21. - Law on Product Conformity Assessment, with subsequent implementations and completions. The equipment that meets the requirements of other approved standards will be accepted if they have provisions equal or better quality than those specified above, or those specified for each piece of equipment, when the Contractor shall clearly justify the differences between the adopted and reference standards within his bidding. The bidding must be accompanied by a copy of the adopted standard. The equipment which deviates from the technical specifications contained in the technical requirements of the tender book, tables, in which they will be highlighted, will be relieved. All equipment will be supplied with all accessories necessary for the assembly, operation and commissioning, control and monitoring. If there are materials or accessories that have not been mentioned in the specifications but are necessary for the proper operation of the equipment, it is the Contractor's obligation to deliver them without a prior request from the Contracting Authority. S7.1.2 Site specific conditions The equipment included in this contract is designed to operate indoors. Microclimate conditions will be provided in the room of the battery in order not to limit their operating performances or lifetime. All equipment must optimally operate under the following conditions: a. Climatic conditions for batteries of storage cells: - place of assembly indoors

7 S7/8 - maximum temperature +27 C - minimum temperature +18 C - relative humidity 2 C) 9% 4 C 5% - normal conditions of dust, smoke, fumes, salt. b. Climatic conditions for rectifier, inverter, distribution boards, emergency generating set: - place of assembly indoors - maximum temperature 4 C - minimum temperature -5 C - relative humidity 2 C) 9% 4 C 5% - normal conditions of dust, smoke, fumes, salt c. All equipment installed indoors and outdoors shall be protected against condensed water. d. Altitude 1 m f. Conditions for earthquake protection according to P1-1/26 (construction): - ground acceleration (ag).24 g - corner period (Tc).7 sec. according to IEC horizontal acceleration at ground level: 3 m/s² S7.1.3 Parameters of the DC and AC installation a) DC installation The DC consumers supply voltage is 22 V. The installation operates isolated from the earth. The power supply sources (the battery and rectifier) will ensure that the supply voltage (at their terminals) is maintained within the limits allowed by the receptors and the installation. b) AC installation The AC consumers supply voltage is 3x23/4 V. The installation will operate with the directly earthed neutral. In order to ensure the proper operation of the consumers, the supply voltage (at their terminals) will be maintained within the limits allowed by the receptors and the installation. S7.1.4 Nameplates, labels a) A nameplate made of a corrosion resistant material will be applied in a visible place on each equipment and auxiliary device. At least the following data regarding the equipment will be

8 S7/9 legibly written on the name plate: name of manufacturer, type of equipment, serial number, year of manufacture, product identification number and all technical data in accordance with the equipment s appropriate standard. b) Labels will be provided for the equipment and materials included in the bidding, and mounted their own or control cabinets and tiles on the connections from terminals to the interior and exterior of the cabinet and on the inner connection conductors for their fast identification or to give guidance on certain tasks (if and where appropriate). The labels and tiles for conductors will be thus written down in order not to be deleted and to maintain a good legibility in time. The standard ring-type tiles applied to conductors are preferred. c) In places provided by the labor protection regulations in force, and wherever deemed necessary, warning labels will be provided. d) The marking-out of the auxiliary services or control cabinets will be made according to IEC All labels will be written in Romanian. S7.1.5 Protective coatings a) All parts of equipment or materials involved in the Contract shall be protected against corrosion during transportation, storage, assembly and operation, by applying a surface treatment corresponding to each item. b) The Contractor will send data about the coating process including: - Type of coating proposed for each important surface of the equipment; - Methods of coating preparation, application and inspection; - Sequence and duration of operations; - Standards for the coating procedure and the coating material constituent elements. S7.1.6 Earthing All metal parts of the equipment, other than those included in the electrical circuits, will allow a smooth connection to the main earthing facility through special terminals provided with screws. S7.2 General requirements for additional equipment S7.2.1 Motors All motors will meet the requirements of IEC 634 and will be able to operate continuously under normal conditions, without dangerous overheating, at frequencies comprised between

9 S7/ Hz and a voltage between.85 U n 1.1 U n. S7.2.2 Low voltage switches The low voltage switches and mini-switches, with less than 1 kv voltage, must be manufactured and tested according to IEC They will be provided both with main and auxiliary contacts necessary for the distance signaling of the main contacts position of their operation mode (protection or deliberate activation). All DC and AC circuit switches will be thus chosen so that to ensure the selectivity of the protections. All switches will be equipped with thermal and electromagnetic protection. S7.2.3 Low voltage disconnectors The low voltage disconnectors for a voltage rating less than 1 kv (69 Vac) must be manufactured and tested according to IEC and IEC 624. They will be used for disconnecting or switching functions. The distance between open contacts must prevent the arc ignition and the drive lever position must always correspond with the main contacts. S7.2.4 Fuses The fuses must comply with the requirements of IEC 6269 and will be dimensioned so as to ensure their selective and indicated operation in relation to other protective devices within the respective circuit. S7.2.5 Selection and control switches, indicating buttons and lamps The switches must meet the requirements of IEC , 5. Their construction must not allow their incorrect activation or interlock, and the packages must be well tight and isolated. The control buttons and indicating lamps must be manufactured and tested according to IEC S7.2.6 Terminal strips The terminal strips must meet the requirements of IEC , 7 and will have electrical characteristics (ampere rating, voltage rating and holding voltage) corresponding to serviced circuits. The terminals will have a robust construction, and will be made of inflammable materials. The movement of the terminals along the rails should take place easily. For single-core conductors, with a cross section up to 6mm 2 and multi-core conductors with a cross section up

10 S7/11 to 16mm 2, pressing screw clips, which carries out the contact pressure, not directly on the conductor, but on a notched bridge which ensures a good contact on the conductor, will be used. The pressing screws will have a firm locking device and the area entering the clip will be protected from touching, so that no live metal part is exposed. For the single-core conductors with a cross section higher than 6 mm 2 and multi-core conductors with a cross section higher than 16mm 2, the terminals will be provided with bolts; the bolts will be blocked so as not to allow rotation. For this type of terminals, the conductors will have terminal ends provided with thimbles (connectors) fixed by crimping. For each cabinet, a terminal strip will be provided separately for the control system interface. The terminal strips will be thus executed so as to allow easy access to the terminals. They will be protected against direct touching. At least one terminal will be left free between the circuits with different polarities. The terminals will allow the connection of some testing devices without having to interrupt the circuit. A 2% reserve of line clips will be provided for each line of clips. S7.3 Technical requirements for the equipment of DC auxiliary services installation S7.3.1 Generalities All continuous current consumers related to the 11 kv and 3 kv substations as well as of the power transformer will be supplied from a stationary, sealed battery, without maintenance and gas emission. The battery will provide for a period of 3 hours (in case of failure of.4 kv network) the permanent consumption of the control installation - protection, telecommunications and emergency lighting, and at the end of this period it will provide the consumption necessary to simultaneously activate the 11 kv circuit breaker and 5 of 3 kv circuit breakers, followed by their successive switching in. At the end of this regime, the battery s voltage must not fall below 1.8 V / element. The DC installation diagram is with simple bus-bar. The continuous current consumers will be radially supplied. The battery will operate in "floating" conditions with an automatic voltage stabilization and current limitation rectifier. If necessary, the Contractor will be able to resize the continuous current auxiliary services equipment, in accordance with the consumptions of the delivered equipment, but by observing the solution and the operating condition described above.

11 S7/12 S7.3.2 Battery a) The Contractor will deliver a stationary acid battery for the 11/3 kv substation. The battery must provide the entire continuous current consumption of the respective installation in case of decommissioning of the rectifiers. The bidder shall submit the selection and verification calculations for the rectifiers and battery once with the bidding. b) The technical requirements of this paragraph are additional to the technical requirements outlined in the Technical Data Sheets - Table C. Type The battery will be with acid and Pb-Ca alloy plates, waterproof constructed, without gas emission and maintenance free. The entire quantity of electrolyte will be immobilized in gel. The battery must withstand the entire substation DC consumption for at least 3 hours. The casual charging of the battery (after a 3 hour discharging) will be done automatically. The duration of this charging will be determined taking into account that the maximum casual load voltage will be 2.3 V/element. Constructive characteristics The tank of each battery element will be fitted with a safety valve. The battery s elements will be arranged in multi-level racks, in an anti-seismic assembling. The racks will be made of steel profiles covered with an insulating and protective layer resistant to acid and will be provided with electric insulating spacers both between the racks and elements and between the racks and the floor. The racks will be mounted at minimum 15 mm above the floor, by support elements which are to be attached with bolts in the concrete floor. The connections between the elements will be protected and insulated in order to protect the operating personnel against touching the live parts. The connection between each battery and the corresponding supply and distribution cabinet will be achieved by 2 insulated cables (one for each polarity). Limit of supply The limit of the bidding complies with the specification list for the equipment - Table B. Each battery will be delivered in a functional anti-seismic assembly with: - supporting structures (racks) - the bolts for their fastening in the floor - a complete set of accessories for the battery s installation, connection and operation consisting of:

12 S7/13 connections between the battery s elements; cable insulating elements and their associated output terminals. S7.3.3 Rectifier a) The Contractor shall deliver an automatic rectifier for the "floating" operation with the battery. The rectifiers must provide the battery s charging in floating or occasional condition (permanent) and, at the same time, the supply all DC permanent consumers. The rectifier should have the ability to take over the entire continuous current consumption corresponding to the substation. b) The technical requirements of this paragraph are additional to the technical requirements outlined in the Technical Data Sheets - Table C. Type Automatic rectifier with automatic stabilization of the output voltage within the limits of ±1%, regardless of AC supply voltage variation and dual current limiting (of total current and the battery charging current). Constructive characteristics Design data a) Supply voltage rating 3 x 4 V, 5 Hz. The alternating voltage may contain transitional waves and impulses due to switching, or abnormal conditions. The rectifier must block these waves and impulses at the AC input with limiting filters. The rectified voltage will be filtered in order to reduce the ripple in DC below 2 V (1% Un); this value also corresponds to the case when the battery is disconnected. b) On the DC side, the rectifier must provide: - battery charging voltage in a normal operating condition (floating) - battery charging voltage in an occasional operating condition - consumers supply: * in continuous operating condition, the rectifier must provide the load related to the permanent consumers and the battery charging current; * the rectifier must provide the full recharge of the battery, after each maximum 3 h discharge, switching automatically to occasional charging. Construction: The rectifier will be fully automated, providing the output voltage adjustment and stabilization,

13 S7/14 compensating the supply voltage variations and the output current limiting in all operating conditions. The rectifier will be designed to be integrated into a telecontrol system and fitted with monitoring and measurement systems. The ventilation of the rectifier cabinet will be through natural convection. On the output (DC side) diodes will be provided for avoiding the battery discharging on the rectifier in case of failure of the AC power supply network. Protection devices such as automatic switches or wire fuses will be provided, with the necessary short-circuit and overload dimensioned protection. The rectifier will allow to choose the loading condition and adjust the charging parameters in floating or occasional condition. For the occasional charging of the battery, a timer will be provided with manual adjustment possibility, and at the end of this period the system must automatically return to its normal charging condition. For remote supervisory the rectifier will have the necessary facilities; minimum remote signaling with potential free contacts or ma signal for: - DC and AC current - DC and AC voltage - earthing in DC network; - rectifier s failure; - minimum and maximum DC voltage; - alternating voltage failure; - alarms at: * minimum voltage; * common alarms; * no supply voltage (AC side) * maximum voltage; * earthing Limit of supply The limit of the bidding complies with the specification list for the equipment - Table B3. The rectifier will be supplied with all necessary accessories.

14 S7/15 S7.4 Technical requirements for the equipment of AC auxiliary services installation S7.4.1 Generalities The supply voltage rating of the alternating current consumers is 3 x 23 / 4 V, 5 Hz. The installation will operate with the neutral connected directly to earth. The alternating current auxiliary services installations will ensure the consumption related to the final profile (including the spares) of the 11/3 kv substation. The supply of the.4 kv alternating current auxiliary services installation will be made out of two distinct sources: - the auxiliary services transformer - the emergency generating set (Diesel unit) The power supply diagram is with simple bus-bar. The AC consumers will be radially supplied. The alternating current auxiliary services installation will be provided with an automate switching to the emergency source. If necessary, the Contractor will resize the alternating current auxiliary services equipment in accordance with the consumptions of the delivered equipment but by observing the solution and the operating condition described above. The Contractor must submit the dimensioning calculations for the proposed auxiliary services equipment. S7.4.2 Power transformer a) The Contractor must deliver the power transformer, dry type, for the alternating current auxiliary services supply of the 11/3 kv substation. b) The technical requirements of this paragraph are additional to the technical requirements outlined in the Technical Data Sheets - Table C. Type Power three-phased transformers, with dry insulation and natural circulation cooling have been provided for the supply of the AC auxiliary services installations. The transformer will be mounted in the designated room. The core, arranged in three columns, will be made of siliceous steel sheets with oriented silicon crystals, cold lamination, and inorganic insulation on both sides. The coiling will be made of copper conductors with F class insulation according to IEC 685 with superior dielectric characteristics, low aging, fireproof, resistant to flame propagation (selfextinguishing). The tap changer will be connected to the HV winding inlets and intended for the change of the

15 S7/16 ratio of conversion in the load absence. The stiffening framing of the magnetic core and the basic frame will be made of steel, in a robust construction, in order to withstand the mechanical stress under operating and transporting condition. The metallic parts will have surface coatings for anti-corrosion protection. The LV winding neutral will be accessible to the terminals and will be dimensioned to the value of phase current. The MV connection at the transformer s terminals will be executed by insulated cable. The terminals will allow the cables connection in a completely isolated solution (plug-in). The temperature will be monitored by the sensors installed in the windings. The temperature will be remote monitored. The transformer will have reduced no-load losses, with the tolerances specified by IEC 676. The transformer must be able to withstand temporary overload according to IEC without damaging the windings, insulation, tap changer, insulated bushings, etc.. The transformer should withstand the short-circuit current under the conditions specified by IEC Limit of supply The transformer will be provided with at least the following items: - connection box for secondary circuits - HV and LV insulated bushings - earthing terminals (2 pieces) - nameplate - lifting eye - wheels - other accessories according to IEC 676. S7.4.3 Technical requirements for emergency generating set (Diesel Unit) a) The Contractor will ensure the delivery of a three-phased power Diesel unit, with automatic start as a source of backup power b) The technical requirements of this paragraph are additional to the technical requirements outlined in the Technical Data Sheets - Table C. Type Three-phased power unit, with automatic start, equipped with fuel supply system, with air compensator and intake pipes, pipes and acoustic absorbent silencer for the outside exhaust

16 S7/17 of gas and power-operated louver system for air intake and exhaust. The power unit together with the annexes will be indoor in a special designated room. The power unit and the annexes must form a functional installed and factory tested unit. Constructive characteristics The power unit will be constructed as a complete installation, where the engine and the generator are mounted on a common frame. The power unit will operate individually, being automatically activated, upon the loss of voltage on the AC bus-bars and will reach its maximum load within max. 15 sec. from receiving the start command. When the voltage returns in the network, the unit will stop automatically. The manual control of the unit is also provided for testing. The fuel supply is made from its own fuel tank (day). For the expansion of the power unit range, a storage tank will be installed in the same room. The transfer of fuel from the storage tank to the day tank will be automatically done. The group will be self-ventilated, with the engine s fan directly driven by the motor, with the exhaust of the entire quantity of heat given off by the unit during its operation. The generator will have no brushes, being provided with built-in automatic voltage regulator. The generator s voltage will be of 3~23/4 Vac, with the neutral accessible at the terminal box. The equipment will provide all the necessary functions by: - Diesel engine s preheating installation; - start battery charging rectifier; - fuel tank filling pump; - engine for the activation of air inlet and outlet louvers; - electric pump for pre-lubrication of Diesel engine; - automatic three-pole switch for the connection / disconnection of the generator within the circuit; - starter; - selection of the operating condition, with remote, local or testing control; - automatic/manual start of Diesel engine; - automatic/manual stop of Diesel engine; - control of normal operation of pre-lubrication, preheating and rectifier; - oil level control - control of generator s electrical parameters (voltage, frequency, intensity)

17 S7/18 - control of Diesel engine parameters (oil pressure, speed, oil temperature, water temperature); - generator s protection against external short-circuit, overcharge, overheating of Diesel engine; - coupling / uncoupling of the main switch; - the blocking in three failed attempts of start at the remote control, the release being made by hand; - distance transmission (in the control room) and triggering of the alarm signals. At least the following signals must be transmitted: - Diesel unit failure; - minimum 1% fuel level - day tank; - minimum 1% fuel level - external tank - rectifier s failure / start battery s minimum voltage; - operational Diesel unit: distance transmission (in the control room) of the values of the frequency and output current, voltage; local signaling of all operating parameters; alternator protection device; maximum voltage protection; reverse power protection; saturation protection. The Diesel engine will be equipped with a battery, without maintenance, for its startup. The rectifier for charging the battery will be an automatic rectifier supplied to the voltage of 23 V, 5 Hz. In order to ensure the start-up and operation of the Diesel engine, the unit will be equipped with a pre-lubrication, pre-heating, starting, air supply, fuel supply, cooling, ventilation, and gas exhaust installation. Its fuel tank (day) will have double walls and should provide the necessary amount of fuel to operate at least 8 hours. In order to fill the tank from an external tank, an electric pump (included in the scope of supply) will be used. The Diesel unit will stop automatically when the achieved values are more dangerous than the level at which the alarm signal has been reached. The unit must be equipped with an engine fuel supply stop system in case of fire detection. The power unit must be maintained in an "able for intervention" condition.

18 S7/19 The consumables deemed as necessary for the warranty period will be delivered together with the power unit. Limit of the bidding. The limit of the bidding complies with the specification list for the equipment - Table B. The unit will be delivered with the necessary accessories, at least those listed below: - electric pump for filling the tank; - own fuel tank and connecting pipes; - start battery and rectifier; - ventilation system for air intake and exhaust (flexible tube and wall grids) and electrically operated louvers; - fully equipped automation cabinet and power cables and secondary circuits between the unit and the cabinet; - accessories for fixing the unit on the concrete foundation. S7.5 Technical requirements for the DC and AC auxiliary services cabinets In order to build the LV cabinets, it must be met the execution and operation requirements of the auxiliary services installation and the following general conditions: - the steel sheet used for the construction of cabinets will be 1.5 mm thick; - the minimum enclosure (according to IEC 6529) of the cabinets will be IP42; - the cubicles will be provided with front windowed door and, if necessary, two back doors; - the window s size will be big enough in order to allow the outdoor visibility, even with the door closed, of the position or status of the equipment inside the cabinet; - the cabinets will be equipped with dismountable steel doors, which are air-tight closed and locked, fixed in the hinges so that they can be open at 15 º; - the cabinets will be equipped with vertical supports and horizontal supports for fixing the devices with front connections; - the metal (horizontal and vertical) clamps for mounting the equipment inside each cabinet will be galvanized and will ensure the continuity of the equipotential connections inside the cabinet; - the upper section of each cabinet will be designated for mounting the bus-bars; - each cabinet will be equipped indoors with the following: lamp (lamps) for lighting mounted in the upper part, controlled by the door position mini-

19 S7/2 switches, supplied in 23 Vac; a 23 Vac socket with a safety contact; a thermostatic-operated anti-condensation resistance. - each cabinet must be naturally ventilated; - the cabinets should allow their installation on the concrete floor; - in the bottom part, the cubicles will be provided with dismountable metal plates for cable entry; - the interior equipment and the terminal strips should be easily accessible, without affecting the neighboring equipment; - the interior wiring should be protected from mechanical damage by trough; - the minimum section of the interior secondary connections will be 2.5 mm²; the selection of the cross section of the conductor for internal connections from the bus-bar to the device and from it to the line of clips will be made in accordance with the applicable regulations, depending on the load of the circuit, the used protection device and the laying conditions; - the internal connection color codes will be: black feeders. blue signal circuits. red measuring circuits yellow-green AC neutral and protection neutral - all internal connections will be made with flexible multi-core conductors for fixed installations; - all cabinets will be delivered completely equipped and wired; - each cabinet will be properly labeled so as to allow an easy identification, both with the access door closed and open; - each indoor installed device must be properly labeled in accordance with the wiring diagram, so as to be easily identified either in front of the cabinet or from the connections (back of the cabinet or back of reversible frames); - the cabinets will be provided with fences for the protection against electrocution in the area of the bus-bars and the area of the danger of electric shock circuits, being labeled with warning inscriptions. Also, warning inscriptions will be placed on the front and back doors. - all cubicles will be corrosion protected by their electrostatic painting;

20 S7/21 - each cabinet must allow a smooth connection of the metal construction to the main earthing switch through special terminals equipped with screws; - in the bottom part, each cubicle will be provided with a copper bus-bar for the earthing, to which all devices and lines of clips provided in the cabinet will be electrically connected; - the external connection cables will be protected when passing through the lower metal plate of the cabinet by cable glands included in the scope of supply; - each cabinet will be equipped with envelope-type pocket for plans. S7.6 Tests for DC and AC auxiliary services equipment a) The type tests should be performed in an independent laboratory or if they are carried out in the laboratory of the manufacturer they will be performed in the presence of a neutral witness or confirmed by an established laboratory. b) The Contractor must provide the test results in accordance with the latest edition of IEC. c) The Contractor must submit the reports for the type tests performed for each type of equipment once with the technical documentation according to Table E. d) The Contracting Authority will decide whether it participates or not in individual tests. Battery a) Type and routine tests will be carried out in accordance with IEC , 22, BS 629, BS 6334 or DIN Type tests: - Verification of materials - Verification of the size and mass - Verification of voltage rating - Verification of rated capacity - Verification of loading - unloading cycle endurance - Verification of constant voltage endurance - Verification of loading conservation - Determination of short circuit current and internal resistance - Determination of the mechanical stress endurance - Determination of endurance in short-circuit conditions - Determination of terminal tightness

21 S7/22 Routine tests: - Verification of materials - Verification of size and mass - Verification of voltage rating - Verification of rated capacity b) For routine tests, the representatives will select a number of 12 elements from each battery to be tested. c) The acceptance tests should be performed according to IEC Rectifier At least the following tests will be performed in accordance with IEC : Type tests: - Insulation resistance measurement - Operating test, including no-load operation, earthing the DC pole, terminal short-circuit - Ampere rating loading test - Verification of measuring and signaling devices - Protection devices test - Heating Test Routine tests: - Insulation resistance measurement - Operating test - Verification of measuring and signaling devices - Protection devices test The acceptance tests will be performed in accordance with IEC Power transformer The test will be performed according to IEC 676 and shall include: a). Routine tests: - verification of the conversion ratio and the group of connections - Measurement of no-load losses and load current - Measurement of the short-circuit impedance and losses - Measurement of winding resistance - Insulation resistance measurement - Routine dielectric tests according to IEC 676-3

22 S7/23 b). Type tests: - Routine tests - Heating test (IEC 676-2) - Type dielectric tests (IEC 676-3). Diesel Unit At least the following tests will be performed: - Visual check - Inspection of mechanical unit - verification of connections continuity - functional tests for the power and automation cabinet and annexes, preheating, rectifier, louvers, fuel transfer pump - Operating under load test - Operational tests including tests in: Overload, 8% load step (from no-load) Surge Over-saturation Reverse power Over-temperature Short-circuit protection. The acceptance tests will be performed in accordance with the applicable ISO and IEC standards. DC/AC services boards Individual and type tests will be carried out for the LV component of the cabinets according to applicable IEC standards. The acceptance tests of cabinets and block terminals will be performed in accordance with IEC The required commissioning tests will be indicated by the contractor in Table D for each part of offered equipment. S7.7 TECHNICAL DATA SHEETS