GROUP-D. Capacitor Bank. Parameters:-

Transcription

1 Capacitor Bank Parameters:- GROUP-D Sl No Item Specification 1 Nominal system voltage 11KV 2 Rated voltage of capacitor bank KV 3 Output of capacitor bank at KV 1200 to 6000 KVAR 4 Rated line current 100 to 400 Amp 5 Connection of capacitor bank Single star 6 No. of phases 3 7 Rated voltage of individual capacitor unit 7.3 KV 8 Capacity of individual capacitor unit 100 :150 & 200 KVAR 9 Insulation level RMS-28 KV & Peak-95 KV 10 Maximum temp. rise over ambient measured on container 10 0 C 11 Type of discharge Internally through resistor provided within the unit 12 Type of fuse External/ Internal fuse 13 Type of Installation Outdoors 14 Power Loss (Tan Delta) Not to exceed 0.2 watt/kvar subject to tolerance as per standard.

2 Rating Sl No 11KV rating Capacitor Bank rating at KV Step configuration KVAR X No. of units I 3150 KVA 1200 KVAR 300 x x1 II 5000 KVA 2100 KVAR 300 x x 2 III 6300 KVA 2400 KVAR 600 x x 2 IV 8000 KVA 3000 KVAR 600 x x 2 V KVA 4200 KVAR 600 x x 4 VI KVA 6000 KVAR 600 x x 4 TECHNICAL SPECIFICATION 11KV (OUT-DOOR) AUTOMATICALLY SWITCHED SHUNT CAPACITOR BANKS ALONG WITH 11 KV CAPACITOR CONTROL PANEL AT 33/11KV SUB-STATIONS SPECIAL INSTRUCTIONS TO BIDDER Please read following instructions carefully before submitting your bid. 1. In order to ascertain the highest reliability of system offered, the bidder shall be a manufacturer of critical components of the system, viz. Capacitor Banks or Automatic Power Factor Controller or Vacuum Capacitor Switches. 2. The Bidder shall execute the work on TURN KEY basis i.e. design, engineering, manufacture, testing at manufacturer s works, supply and delivery, erection, testing and commissioning of 11kV Automatically switched ( Outdoor type ) Capacitor banks along with the accessories including Civil works. The design calculation sheet for fixing of Capacitor Bank with capacity to improve p.f. From 0.8 to unity shall also be submitted. 3. All the drawings, i.e. elevation, side view, plan, cross sectional view etc., in Auto CAD format and manuals in PDF format, for offered item shall be submitted. Also the hard copies as per specification shall be submitted. 4. The bidder shall submit Quality Assurance Plan for manufacturing process and Field Quality Plan with the technical bid. 5. The bidder shall have to submit all the required type test reports for the offered item. However, in the event of partial submission or reports older than specified limit, bidder must submit his confirmation for those type test report/s to be submitted in the event of an order, without affecting delivery schedule, before commencement of

3 supply, free of cost. In absence of this confirmation, the evaluation shall be carried out accordingly as non submission of type test reports. 6. The bidder must fill up all the point of GTP for offered item/s. Instead of indicating refer drawing, or as per IS/IEC, the exact value/s must be filled in. 7. All the points other than GTP, which are asked to confirm in technical specifications must be submitted separately with the bid. 8. The bidder is required to impart training in view of manufacture, assembly, erection, operation and maintenance for offered item, at his works, to the person/s identified by NESCO, in the event of an order, free of cost. The cost of logistics will be bear by NESCO. 9. Please note that the evaluation will be carried out on the strength of content of bid only. No further correspondence will be made. 10. The bidder shall bring out all the technical deviation/s only at the specified annexure. 11. The bidder has the responsibility for 10 years maintenance (includes supply of materials and labour) of the installed capacitor Bank for trouble free operation beyond the guarantee period. Bidder has to ascertain that the breakdown occurred in the capacitor bank shall be rectified in a very reasonable time (preferably within two days of occurring of fault). 12. Bidder has liberty to visit the different sites to ascertain the quantum of works required to be taken up before quoting of price. 1. SCOPE: 1.1 This Scope covers design, engineering, manufacture, testing at manufacturer s works, supply and delivery, erection, civil works including testing and commissioning of outdoor type medium voltage three phase automatic capacitor bank consisting of three steps of Capacitor Banks depending upon KVAR requirement at 11 kv. All controls, switching devices, and protection features are enclosed in a sheet steel enclosure. The banks shall come fully suitable for outdoor installation on structure along with the necessary equipments in all respects The specification covers 3 phase, 50 Hz, Out door type automatically switched shunt capacitor bank intended for installation at 11 KV feeders of 33/ 11 KV power transformers in various sub-stations. It also includes Leveling of site, excavation of pits, casting of foundation for elevating structures on concrete plinth and other mounting structures as applicable as per approved drawing, erection, elevating structure and mounting rack, painting wherever required, assembling of capacitor units on the rack, individual connection to make bank formation. The equipment covered in this specification comprises Capacitor banks in steps, 0.2 % Series Reactors, CRCA Cubicle, Vacuum switches/contactors, HT Fuses, RVT, CT/NCT, VCB, CRP, Isolator, LA,Power & Control

4 cables and its termination along with suitable terminal connectors, Conductors, foundation bolts and earthing connection materials for all equipments & structures etc It is not be the intent to specify completely here in all the details of design & construction of material. However the material shall conform in all respects to high standards of Engineering, design and workmanship operation in manner acceptable to the purchaser, who will interpret the meanings of drawings and specification and shall have the power to reject any work or material which in his judgment is not in accordance therewith. The offered material shall be complete with all components necessary for their effective and trouble free operation. Such components shall be deemed to be within the scope of bidders supply irrespective of whether these are specifically brought out in his specification and / or purchaser order or not In order to ascertain the highest reliability of system offered, the bidder shall be a manufacture of critical components of the system, viz. Capacitor Banks, Automatic Power Factor Controller and Vacuum Capacitor Switches. 1.5 Site surfacing are also to be done by spreading 20mm nominal crusher broken HG metals in two compacted layers to maintain 100 mm thickness for the entire area of the proposed capacitor bank. The spreading of metal shall be done after spreading of good quality organic free river bed sand of 150mm thickness (compacted). The spreading of sand shall be done after making antiweed treatment as per standard practice and instruction of Engineer in Charge. 1.6 Laying of earth mat (75X10 mm GI Flat) and other earth riser (50 X 6 mm GI Flat) to the equipment and structural (50X6 mm GI Flat) and treated earth pit are also under the scope of this contract. Under this scope, the bidder has the responsibility for 10 years maintenance (includes supply of materials and labour) of the installed capacitor Bank for trouble free operation beyond the guarantee period. Bidder has to ascertain that the breakdown occurred in the capacitor bank shall be rectified in a very reasonable time (preferably within two days of occurring of fault). Minimum spare list is enclosed for reference and quoting the AMC price, which shall be on LOT/Package basis.. 2. CLIMATIC CONDITION: 1. Max. ambient air temperature 50º C 2. Min. ambient air temperature 5º C 3. Average Daily Max. ambient temperature 35º C 4. Max. altitude above mean sea level (Meters) Minimum Relative Humidity (%age) 30

5 6. Max. Relative Humidity (%age) Avg. No. of Rainy days/year Avg. annual rainfall 1000 mm 9. Wind Zone, Maximum wind pressure Zone- V, 50 m/sec. 3. APPLICABLE STANDARD: ISS No. TITLE : 1998 or IEC Specification for H.T, Shunt Capacitor IS Vacuum Contactors/Capacitor Switch IS Isolator IS 2705 Current Transformer IS 3070 Lighting Arrestor IS 3156 R.V.T IS 5553 Series Reactor IEC Automatic Power Factor Controller The other components such as Vacuum Circuit Breaker Panel and other Auxiliary equipment shall comply with the latest version of relevant Indian Standards/International standards. Equipment conforming to other internationally accepted standards which ensure equal or higher quality than the above mentioned standards would also be acceptable. In such case bidders, who wish to offer material conforming to standards other than listed above, shall clearly bring the salient points of difference between the standards forward/adopted and specified herein above. Four copies of such standards with authentic English Translation shall be furnished along with the offer. In case of conflict order of preference shall be (1) ISS (2) IEC (3) other standards. In case of any difference between provisions of these standards and provision of this specification of the provision contained in this specification shall prevail. All IS/IEC shall be read with latest amendments in vogue on the date of technical bid opening KV CAPACITOR BANK 4.1 SCOPE: The capacitor banks are for use in a 3 phase 50 Hz 11 KV system. Capacitor bank shall consists series/parallel combination of small units of capacitor cells per phase, each with an out put rating of 100 or 150 or 200 or 400 KVAR or any other combination of 7.3 KV single phase. Capacitor units should be connected in externally star with appropriate number of capacitors in parallel as per requirement to achieve p.f. to the level of 0.95 to 1.0. For Example 3 single units connected in star to obtain 300/600 KVAR at KV 3 phase or 2 capacitors units of 150 kvar in parallel per phase with 3 phase connection in star to obtain 600 or 1200 or 900 KVAR at KV 3 phase. Necessary number of steps should be provided to meet requirement given in the schedule.

6 i) Each capacitor unit should be provided with external / internal expulsion fuse 12 KV class and suitable current rating. Capacitor shall meet following specifications: ii) Each capacitor unit shall have scaled sheet steel container with suitable mounting bracket which can easily be fixed to frame structures. The container shall be built from heavy gauge Stainless Steel, 1.6 mm thick sheet steel with welded seams, mechanically strong, rigid and hermetically sealed. The container of capacitor Unit shall be designed to allow for expansion and contraction due to all ambient & loading conditions expected during the life of the unit. iii) The capacitor elements shall be thoroughly dried and impregnated with an impregnant that has been completely refined so as not to leave any gas or impurities which may cause deterioration of the dielectric. The impregnant used shall have low viscosity and high chemical stability. It should be non-pcb (NPCB). It shall be incombustible and have a high dielectric constant. Capacitor dielectric shall be 100% polypropylene. However, in case of 100% polypropylene capacitor the polypropylene shall be hazy and aluminum foil should be embossed for proper impregnation. The Characteristics of the oil used for impregnation shall be furnished in the bid. The total thickness of dielectric (excluding aluminum foil) should be clearly indicated in the bid. The nos of layers of dielectric shall be three of more. The details of aluminum foil shall also be furnished. The impregnation shall be carried out under high vacuum & unit shall be totally sealed. The raw material to be used for manufacturing of capacitor unit i.e. polypropylene film, non PCB non toxic oil and aluminum foil shall be of best quality. List of raw material sources shall be submitted with technical bid. iv) Each unit shall have two bushing for terminal connection. The rating of bushing should not be less than 15 kv, suitable for series / parallel connection with other units to form capacitor bank at 50 Hz. The bushing shall be of porcelain suitable for heavily polluted atmosphere having required creepage distance not less than 375 mm. v) The capacitor shall have low value of loss which shall not exceed 0.2 watt per KVAR. The loss value of discharge device/resistor and capacitor unit shall be indicated in GTP. The tan delta characteristics of the capacitor unit shall be furnished. The losses in watts for each capacitor unit including losses in fuses and discharge resistors forming integral part of the capacitors along with losses for series reactor shall be guaranteed. If these figures of capacitor losses exceed 0.2W/KVAR, the capacitors will be liable for rejection. vi) Capacitors having self healing property MPP Technology with some added feature can be preferred. vii) Total losses shall be complied as below: 6 x (W x n + losses in series reactor) Where, n is number of capacitor units per phase of star connection and W is the total loss in a capacitor unit. The loss temperature characteristics, capacity temperature characteristics and insulation resistance temperature characteristics shall also be furnished.

7 The use of P.C.B. as dielectric for capacitor shall not be acceptable. The dielectric medium to be used shall be nonpoisonous and non-toxic in nature and shall not cause pollution of environment. Sl No. Item Specification 1 Nominal system voltage 11 KV 2 Rated voltage of capacitor bank KV 3 Output of capacitor bank at KV 1200 to 6000 KVAR 4 Rated line current 100 to 400 Amp 5 Connection of capacitor bank Single Star 6 No. of phases 3 7 Rated voltage of individual capacitor 7.3 kv unit 8 Capacity of individual capacitor unit 100;150 & 200 KVAR 9 Insulation level RMS-28 KV Peak-95 KV 10 Maximum temp. rise over ambient 10º C measured on container 11 Type of discharge Internally though resistor provided within the unit 12 Type of fuse External / Internal fuse 13 Type of Installation Outdoors 14 Power loss (Tan delta) Not to exceed 0.2 watt/kvar subject to tolerance as per standard 4.2 Capacitor Bank Rating: Sr. No 11kV Rating Capacitor Bank Rating at KV Step configuration kvar X No. of units I KVA 1200 KVAR 300x2+600x1 II 5000 KVA 2100 KVAR 300x1+900x2 III 6300 KVA 2400 KVAR 600x1+900x2 III 8000 KVA 3000 KVAR 600x2+900x2 IV KVA 4200 KVAR 600x1+900x4 V KVA 6000 KVAR 600x4+900x4 Each capacitor unit shall be provided with external / internal HT HRC fuse of 12 KV class with suitable current rating. Capacitor shall meet following specifications: 4.3 Temperature Category: The capacitor shall be suitable for operation with upper limit of ambient temperature 60 ºC.

8 4.4 Rated Voltage: The rated voltage of 3 phase capacitor banks shall be 11 KV (phase to phase) and maximum operational voltage shall be rated for kv. 4.5 Rated Output: The Rated output of 3 phase capacitor banks shall be 600, 1200, 2400, 3000, 3600, 4800, 6000 or 7200 KVAR at the maximum operational voltage of KV intended for use in suitable combination on power transformers rating of 3.15 MVA, 5 MVA, 6.3 MVA, 8 MVA, 10 MVA, 12.5 MVA & 16 MVA. The standard basic unit rating of capacitors (single phase) shall be 100/150/200KVAR. The unit shall be connected in externally star formation with floating neutral. (i) Voltage : The maximum rms voltage that may safely be applied to the capacitor, rated for continuous duty, shall not exceed the rated rms voltage of the capacitor by more than 10%, and its peak or crest value shall not exceed the same rms voltage by more than 56%. (ii) Current : The capacitor unit shall be suitable for continuous operating at rms line current not exceeding 30 percent over the current which would flow through capacitors at + 10% rated voltage and + 1% to - 5% rated frequency. (50 HZ). iii) Discharge : Each capacitor unit shall contain a directly connected internal discharge resistors, which shall be capable of reducing the residual voltage from crest value of the rated voltage to 50 volts or less within 5 minutes after the capacitor is disconnected from the source of supply. Time of quick switching on & off shall be specified. During quick switching on and off, the discharge device shall reduce the residual voltage to 10% or less of the rated voltage between switching on and switching off operations 4.6 Permissible Overloads: For capacitor covered in this specification, the maximum permissible overloads with regard to voltage, current and reactive output shall not exceed the limits specified in IS: Power Loss: The power loss in capacitors shall not exceed 0.2 watt / KVAR (Subject to tolerance of + 10 %). 4.8 Discharge device: Suitable discharge device shall be connected across the capacitor unit in accordance with the provision of IS: The discharge device shall reduce the residual voltage from the crest value of the rated voltage to 50 V or less within 5 Minutes after the capacitor is disconnected from the source of the supply. 5. Protective Measures The container of each capacitor unit shall be provided with suitable earthing terminal clearly marked with Earth symbol.

9 The capacitor units shall be provided with internal/external fuses. Wherever specified, for the protection of each capacitor unit suitable expulsion type internally/externally mounted fuses of adequate rupturing capacity shall be provided. It shall conform to IS-9402: The characteristics of the fuse should be such that it shall isolate the faulty unit only, and protect it against mechanical destruction due to internal failure. The fuses shall not melt or deteriorate when subjected to inrush currents which occur during the life of the bank. The fuses shall not make any healthy capacitor element out of circuit, either in course of isolating the faulty element or due to any external fault, which should be taken care of by the other protective gears earlier to operation of fuses. The selection of fuse to be done in such a manner that characteristic of fuse shall match suitably with over current withstand characteristic of associated capacitor unit. The fuses shall be of adequate thermal capacity to cater for the increased heating which may occur due to harmonics and capacitor current fluctuations. Fuses shall be capable of disconnecting the faulty element over a wide range of unit terminal voltages from 70 to 150%. In case of all the elements in the same row are fused out in cascade in an internal fuse unit then the fuse element blown out shall be capable of successful disconnection with a voltage of not less than 100% rated voltage appearing across its terminals. The capacitor units shall be so arranged in the bank as to avoid bird faults, by providing adequate clearance between the body of the capacitor unit, of one phase, and the line terminal or the common bus for the units of the adjacent other phases. Necessary bird guards at required locations and insulating sleeve on conductor shall be provided. The units shall be so arranged that uniform temperature of complete bank is maintained when installed in open yard. The termination to the Capacitor Banks shall be full-proof and shall be fixed rigidly. In case of protection by internal fuses, each unit shall be provided with fuses for each of its element, so that the faulty element within the unit is automatically out of circuit. The operation of the bank shall not be disturbed (except change in capacity within the unit) in any way by switching out of the faulty element. Isolation of one capacitor unit in a group should not cause voltage unbalance of more than 110% rated voltage on the remaining capacitors in the group. 6.0 General Requirements: The capacitor shall be of non-pcb type, using polypropylene film as the dielectric. Complete mounting brackets supporting insulators and all other components for formation of capacitor banks racks shall be supplied along with the capacitor units. Necessary foundation bolts/nuts shall also be supplied. The outside of the capacitor container and other structures should have smooth and tidy look and should be coated with the weather proof, corrosion-resistant paint of white or light grey. Marking: The capacitor unit shall be provided with a rating plate and terminal markings as stipulated in IS: The bidder shall submit the type test report along with the bid for the ratings offered or higher ratings of individual units

10 7.0 TESTS: The bidder shall submit the type test report along with the bid.the switched capacitors shall be subjected to all the type, routine and acceptance test in accordance with IS: Routine Tests: 1) Visual inspection 2) Sealing Test 3) Measurement of output and capacitance 4) Insulation resistance between terminals and containers 5) Capacitor loss tangent (tan delta) measurement 6) Voltage test between terminals and containers 7) Test of discharge device 7.2 Type Tests: The tests indicated in the IS:13925 with latest amendments shall constitute the type tests. All the type tests as under shall be carried out at the laboratories accredited by National Accreditation Board of Testing and Calibration Laboratories (NABL) or any International Lab. Accredited Cooperation (ILAC) in accordance with IS:2834 with latest amendments. a) Voltage test between terminals b) Ac voltage test between terminals and containers c) Thermal stability test d) Capacitor loss tangent (tan delta) measurement e) Lightening impulse test between terminals and container f) Short circuit The Type test report shall be submitted along with the Tender & the same shall not be more than 5 years old on the date of Tender opening. 8.0 AUTOMATIC CONTROL UNIT (ACU) 8.1 Switching Arrangement The Automatic control unit shall be provided inside the control room to continuously monitor total KAVR requirement on secondary side of the transformer and shall automatically switch ON or switch OFF the capacitor banks through the operation of 12 KV Capacitor Switch.. Overriding provision shall be made for electrical switching ON or OFF of the capacitor switch by the operator from the ACU control box. The Power factor controller will automatically switch equal or unequal capacitor bank stages in or out to regulate the System power factor to a preset value. The controller shall

11 monitor individual stages for loss in kvar, and shall continue to regulate to a preset value in the event there is a defective stage 8.2 Time Delay: An interposing factory set on-delay shall be provided to prevent the energization of a capacitor bank in less than 10 minutes. The manufacturer of the bank shall confirm that when going from the Manual position to the Auto position on any stage, that the corresponding stage will not be energized in less than 10 minutes. The switching OFF operation of relevant steps will be instantaneous. 8.3 Controls The Automatic control unit shall instantly switch OFF the incomer VCB of capacitor bank in the following contingencies occurring in any of the phases. a) Voltage increased by 10% above the rated voltage of 11 KV. b) Power transformer current impedance (due to single phasing and for any other reasons) between any of the two phases exceeding 20 % of the lowest. c) Current increases in any capacitor unit by 30% above the rated current (only the relevant capacitor switch will open). Current between any of the two phases of the capacitor bank differs more than 15% of the lowest current of the 3 phases (only the relevant capacitor switch will open). 8.4 Monitoring Facility: A suitable ammeter with selector switch to indicate the capacitor current in each phases of the capacitor bank shall be provided on the ACU panel inside the control room. Indicating lamps will also be provided to indicate ON & OFF status of each capacitor bank. In addition, the controller shall consists of the following features: Digital setting of individual parameters including target power factor, switching time, no. of steps, etc. Digital indication of preset power-factor, preset parameters, and specified installation data. Facility to Connect a Mini-printer. Plug-in Terminal Connection. Automatic elimination of defective capacitor steps and their indication on the LCD display as also by LED indicators on the front fascia of the Controller. Visual Display of Harmonic Overload Alarm A counter that counts the number of times each stage has been energized shall be provided. Each stage shall be equipped with on/off/auto switches, stage on indicator (green) and stage faulty indicator (red) Control Power: The DC control voltage for operation of the ACU shall be taken from sub-station battery. The standard DC control voltage at the 33/11 KV sub- station is 24 volts. The AC supply is from (230 V) Station Transformer.

12 8.6 Temperature Variation: The control equipment and associate circuitry shall be suitable for operation at an ambient temperature in the range of +5º C to (+) 60º C. 8.7 Protection of ACU: Besides in-built protection against lines surges and transient over voltages, suitable fuses/mcbs shall be provided for protection against over current. The ACU shall remain fully functional during and after line surges and transient over voltages. 8.8 Control Unit Casing: Except for the terminals, the ACU shall be enclosed in a suitable casing so as to avoid ingress of dust. 8.9 TESTS The Automatic Power Factor Controller must be Type tested for Accuracy and for compliance to EMI/EMC to the relevant standards in any International Lab. Accredited Cooperation (ILAC). or an external NABL accredited laboratory. The Type test report shall be submitted along with the Tender & the same shall not be more than 5 years old on the date of Tender opening kv CAPACITOR SWITCHES 9.1 SCOPE This specification covers 11 KV, 50 Hz, out-door type automatic capacitor switches suitable for switching capacitor banks of 300 KVAR, 600 KVAR and 1200 KVAR ratings or any other higher rating specified. 9.2 APPLICABLE STANDARDS Unless otherwise stipulated in this specification the capacitor switch shall comply with the latest version of IS:9920 (AC Switches for voltages above 1000 V). Capacitors should be tested by International Laboratories as per IEC : ( 1998 ) 9.3 RATED VOTAGE The rated voltage for the capacitor switch shall be 12 KV. This represents the highest system voltage corresponding to the nominal system voltage of 11 KV. 9.4 RATED CURRENT The standard rated normal current shall be 200A. 9.5 RATED CAPACITIVE SWITCHING CURRENT The rated capacitive switching current shall not be less than 50A. Note: The capability of the switch shall also take into account the parallel switching of capacitor bank steps. 9.6 RATED SHORT TIME CURRENT

13 The rated short time symmetrical current for 1 second shall be 10KA (rms A.C. component). 9.7 RATED MAKING CURRENT The rated making current shall be 2.5 times the rms value of the a.c. component of rated short time capacity. 9.8 BASIC IMPULSE LEVEL (BIL) The rated basic impulse level of switch to earth as also across the open terminals shall be 75 KV. 9.9 CONTROL SUPPLY The control power for closing the switch shall be 230 V single phase AC supply. The closing mechanism shall be suitable for a voltage variation of (+) 10% to (-)20% DESIGN & CONSTRUCTION REQUIREMENSTS 1. TYPE The switches shall be of either vacuum or SF6 type. 2. The capacitor switches shall be of three phase construction and shall be suitable for remote operation. 3. The capacitor switch shall be suitable for outdoor installation and shall have sealed weather proof type construction. 4. The capacitor switch shall be provided with a mechanical indicator to show whether the contact is in open/closed position, locally, as also through indication on the ACU panel. Provision shall also be made for manual closing and opening. 5. The metallic enclosure of the capacitor switch shall be provided with two earthing terminals marked with the earth symbol. 6. The bushing provided on the switch shall have clamp type of terminals to directly receive aluminium conductors up to 10mm dia in both horizontal and vertical directions. The terminal arrangement shall be such as to avoid bimetallic corrosion OPERATING MECHANSIM The operating mechanism shall be either solenoid or motor charged spring for which the control supply shall be as per clause 31

14 9.12 MECHANICAL AND ELECTRICAL ENDURANCE The switch shall be capable of performing not less than 10,000 mechanical operations and 10,000 electrical operations at 50A capacitive current without getting damaged MARKING The capacitor switch shall be provided with a legible and indelibly marked name plate with the following: a) Name of the manufacturer. b) Type, designation and serial number. c) Rated voltage and current. d) Rated frequency. e) Number of poles. f) Rated short time current (symmetrical). g) Rated making current. h) Rated capacitive switching current. I) Year of manufacture j) Property of NESCO 9.14 TESTS The Capacitor switch shall be subjected to the following tests in accordance with the IS:9920 (Part-IV) &also should be tested by International Lab. Accredited Cooperation (ILAC)as per IEC : ( Type Tests I. Tests to verify the insulation level, including withstand tests at power frequency voltages on auxiliary equipment. II. Tests to prove that the temperature rise of any part does not exceed the specified values III. Radio influence voltage test IV. Rated making current. V. Rated breaking tests including tests for the rated capacitive current. VI. Tests to prove the capability of the switch to carry the rated short time current. VII. Tests to prove satisfactory operation and mechanical/electrical endurance. The Type tests for compliance to the relevant standards should have been carried out in an external NABL accredited laboratory. The Type test report shall be submitted along with the Tender & the same shall not be more than 5years old on the date of Tender opening Routine Tests a) Power frequency voltage dry tests.

15 b) Voltage tests for auxiliary circuits. c) Measurement of the resistance of the main circuits. d) Tests to prove satisfactory operation AUXILARY EQUIPMENTS 10.1 TECHNICAL SPECIFICATION FOR 11 KV ISOLATOR SCOPE This specification provides for design, manufacturer, testing at manufacturer s Works and delivery,supervision of erection, commissioning(if required )of outdoor station type 11 KV, 3 phase triple pole double break gang operated centre rotating type (Single Isolator with earth switches, with electrical inter lock (castle key), insulators and complete in all respect with bimetallic connectors arcing horns operating mechanism, auxiliary switches, indicating devices, fixing detail etc. as described hereinafter. Double Tandem operating GI pipes (40mm Dia. medium gauge) & down pipe of 50mm dia, medium gauge GI pipe has to be used. Isolator should be of Switchgear and Structurals, CGL / GR POWER / AREVA / SIEMENS / EPICAST make Main features Type: 11 KV 1. Main switch Double end break center post rotating, gang operated 2. Service Outdoor 3. Applicable standard - IS : 9921 / IEC-129/IEC Pole : 3 pole gang operator 5. Rated voltage nominal / 11/12 Maximum (kv) 6. Rated Frequency 50 HZ + 5% 7. System earthing effectively earthed 8. Temperature rise As per relevant IS/IEC publication 9. Insulation level impulse with stand voltage : a) Across Isolating distance (kv peak) 85 b) To earthed & between poles

16 (kv Peak) minute power frequency with stand voltage a) Across Isolating distance (kv Peak) 32 b) To earthed & between poles (kv Peak) Rated current Short time current for 3 sec. 25KA 13. Operating mechanism Manual 14. Auxiliary voltage 11 KV a) Control & Inter lock 24V DC 80% to 110% 15. Safe duration of overload a) 150% of rated current 5 minute b) 120% of rated current 30 minute 16. Minimum creepage distance of support and Rotating insulator 500mm i. Mounting structure Upright on G.I structure ii. Terminal connector type Bimetallic clamp size as per Requirement iii. Control Local REMARKS: The operating mechanism for earth switch 11 KV shall be manual operated STANDARDS Disconnecting switches covered by this specification shall conform to latest edition IEC-129/IEC I.S.1813 and IS: 9921,IS-325,and unless specifically stated otherwise in this specification TYPE The 11 KV Isolators shall be outdoor type with three phase double break centre rotating type [Single (SI) Isolators suitable for manual operation and local operation. They shall have crank and reduction gear mechanism. All Isolators offered shall be suitable for horizontal upright mounting on steel structures. Each pole unit of the multiple Isolators shall be of identical construction and mechanically linked for gang operation. Each pole of the Isolator shall be provided with two sets of contacts to be operated in series and the moving contact blades shall rotate in horizontal plane. The design shall be such that the operating mechanism with the linkages shall be suitable for mounting on any of the outer pole ends without much difficulty and with minimum shifting of parts. Moving contacts of all isolators shall rotate through 90 deg from their fully closed position to fully open position so that the break is distinct and clearly visible from ground level. The 11 KV Isolators offered by the Bidder shall be designed for Normal rating current for 800 amp It should suitable for continuous service at the system voltages specified herein. The Isolators shall be suitable to carry the rated current continuously and full short circuit current of 25 KA for 11 KV respectively for 3 second at site condition without any appreciable rise in temperature. These shall also be suitable for operation at 110% rated (normal) voltage. The Isolators shall be suitable for Isolating low capacitive / inductive currents of 0.7amp at 0.15 power factor. The isolators shall be so constructed that they don t open under the influence of short circuit conditions. The Isolators and earthing switches are required to be used on electrically exposed installation and this should be taken into account while fixing the clearance between phases and between phase and earth MAIN CONTACTS & MOVING ARM

17 All Isolators shall have heavy duty, self aligning and high pressure line type contacts made of high conductivity, corrosion resistant, hard-drawn electrolytic copper strips with 5 mm minimum thickness and proper contact area. Also current density to be mm²=1.5 Amp. Fixed contact should consist of loops of above copper strips suitable for 800 Amps ratings for 11 KV Isolators. The hard dawn electrolytic copper strips should be silver plated 10 micron thickness or more as per the requirement and fixed contacts should be backed by powerful phosphor bronze/stainless steel springs of suitable numbers. However, the thickness and contact area of the contact should conform to the drawing approved during type test. These fixed and moving contacts shall be able to carry the rated current continuously and the maximum fault current of 25 KA for 11 KV for 3 seconds without any appreciable rise in temperature. The Isolator blades shall retain their form and straightness under all conditions of operation including all mechanical stress arising out of operation as well as under rated short circuit condition. Fixed guides shall be provided so that even when the blades are out of alignment by one inch (maximum), closing of the switches, proper seating of the blades in between contacts and adequate pressure to give enough contact surface is ensured. Wherever possible, the blades shall be counter balanced by weights and springs. The contact shall be self cleaning by the wiping action created by the movements of the blades. The surface of the contacts shall be tendered smooth and silver plated. The Isolator shall be self cleaning type so that when isolator remain closed for long periods in a heavily polluted atmosphere, binding does not occur. No undue wear or scuffing shall be evident during the mechanical endurance tests, contacts and springs shall be designed so that adjustment of contact pressure shall not be necessary throughout the life of the isolator. Each contact or part of contacts shall be independently sprung so that full pressure is maintained on all contact at all times ARCING HORN AND GRADING HORN Suitable arcing horn made of tinned electrolytic copper which are required for guiding contacts shall be provided on the fixed and moving contacts of all Isolators. The contacts shall be of make before and break after type ELECTRICAL INTERLOCK / MECHANICAL INTERLOCK The disconnecting switches whenever required shall be with an approved type electrical interlock for interlocking with the associated circuit breakers and earth switch. Electrical interlock assembly should be more right in construction and properly mounted to ensure reliable operation. The design should be such that the electrical circuit for the interlocking mechanism will only remain energised during operation of the switches AUXILIARY SWITCHES All isolators and earthing switches shall be provided with 24VDC auxiliary switches for their remote position indication on the control board and for electrical interlocking with other equipment. The auxiliary switch shall be provided with a minimum of auxiliary contacts normally 4 open and normally 4closed contacts with 10 amp current carrying capacity EARTH SWITCH Line earth switch shall consist of three earthing blades for Isolator which normally rest against the frame when the connected Isolator is in closed position. The earthing blades for three phase shall be mechanically linked to a coupling shaft which shall be capable of being fitted on either side of the Isolator. The earthing blades shall match and be similar to the main switch blades and shall be provided at the hinge; with suitable flexible conductors with terminal lugs for connecting to the station ground bus. The earthing blades shall be operated by a separate mechanism but shall be mechanically interlocked with the main switch so that the earthing blades can be closed only when the main switches are in open position and vice-versa. The earthing blades shall be gang operated and all the three blades will operate simultaneously OPERATING MACHANISM The operating mechanism shall be simple and shall ensure quick and effective 1000 operation. The design shall be such as to enable one man to operate it with nominal effort. The operating mechanism box shall be made out of Aluminum extruded (Aluminum Alloy) sections of minimum 3mm thickness.

18 The Isolator blades shall be in positive continuous control throughout the entire cycles of operation. The operating rods and pipes shall be rigid enough to maintain positive control under most adverse conditions and to withstand all torsional and bending stresses arising from operation. Operation of the switches at any speed should not result in improper functioning, in displacement of parts / machines after final adjustment has been made. All holes in cranks, linkages etc. having moving pins shall be drilled and fitted accurately so as to prevent slackness and lost motion. Provision shall be made for padlocking the operating mechanism of disconnecting and earth switches in both open and closed positions. Bearings shall be ball and roller type shall be protected from weather and dust by means of cover and grease retainers. Bearings pressures shall be kept low to ensure long life and care of operation CONTROL CABINET The control cabinet of the operating mechanism shall be made out of aluminium sheet of minimum 3mm thickness. Hinged door shall be provided with pad locking arrangement. Sloping rain hood shall be provided to cover all sides. 15 mm thick neoprene or better type of gaskets shall be provided to ensure degree of protections of at least IP 55 as per IS 2147/IS The cabinet shall be suitable for mounting on support structure/or on a separate plinth foundation with adjustment for vertical, horizontal and longitudinal alignment. Details of these arrangements shall be furnished along with the offer POSITION INDICATOR A position indicator to show the isolator is in ON or OFF position to be provided NAME PLATE Isolator, earthing switches and their operating devices shall be provided with name plate. The name plate shall be weather proof and corrosion proof. It shall be mounted in such a position that it shall be visible in the position of normal service and installation. It shall carry the following information s duly engraved or punched on it. Name : NESCO Name of manufacturer Order No. Manufacturers serial No. Rated voltage Rated normal current Rated short time current (rms) and duration Weight All components shall be given adequate treatment of climate proofing as per IS:3202 so as to withstand corrosive and severe service conditions. All metal parts not suitable for painting such as structural steel, pipes, rods, levers, linkages, nuts and bolts used in other than current path etc. shall be hot dip galvanized as per IS Complete details of painting, galvanizing and climate proofing of the equipment shall be furnished in the offer TESTS i) Type Tests Isolators offered, shall be fully type tested as per the relevant standards. The Bidder shall furnish three sets of the following valid type test reports for their different type of offered Isolators along with the offer. The Purchaser reserves the right to demand repetition of some or all the type tests in the presence of purchaser s representative. For this purpose the Bidder may quote unit rates for carrying out each type test and this will be taken during bid price evaluation, if required. a) Short time withstand & peak withstand current test for Isolator & Earth Switch. b) Power frequency (Dry & Wet), Lightening Impulse dry withstand Test. c) Mechanical endurance Test. d) IP-55 test.

19 During type tests the isolator shall be mounted on its own support structure or equivalent support structure and installed with its own operating mechanism to make the type tests representative. Drawing of equivalent support structure and mounting arrangements shall be furnished for Purchaser s approval before conducting the type tests. The type tests shall be conducted on the isolator along with approved insulators and terminal connectors. Mechanical endurance test shall be conducted on the main switch as well as earth switch of one isolator of each type. ii) ACCEPTANCE AND ROUTINE TEST All acceptance and routine test as stipulated in the relevant standards shall be carried out by the supplier in presence of Purchaser s representative. Mechanical operation test (routine test) shall be conducted on isolator (main switch and earth switch) at the supplier s works as well as purchaser s substation site. Immediately after finalisation of the programme of type / acceptance, routine testing the supplier shall give sufficient advance intimation (clear 20 days advance intimation), along with shop routine test certificates, valid calibration reports from Govt. approved test house for the equipments, instruments to be used during testing for scrutiny by the purchaser to enable him to depute his representative for witnessing the tests. If there will be any discrepancies in the shop routine test certificates and calibration reports furnished by the firm then after settlement of the discrepancies only, purchaser s representative will be deputed for witnessing the tests. Special tests proposed to be conducted (if decided to conduct) as type test on isolators.. These special type test charges shall be quoted along with all other type tests as per relevant IEC standard and these charges shall be included in the total bid price. No material shall be dispatched from its point of manufacture unless the material has been satisfactorily inspected and tested. The acceptance of any quantity of the equipment shall in no way relieve the supplier of his responsibility for meeting all the requirements of this specification and shall not prevent subsequent rejection if such equipment are later found to be defective PACKING AND FORWARDING. The equipment shall be packed in crates suitable for vertical / horizontal transport, as the case may be and suitable to withstand handling during transport and outdoor storage during transit. The supplier shall be responsible for any damage to the equipment during transit, due to improper and inadequate packing. The easily damageable material shall be carefully packed and marked with the appropriate caution symbols. Wherever necessary, proper arrangement for lifting, such as lifting hooks etc. shall be provided. Any material found short inside the packing cases shall be supplied by supplier without any extra cost. Each consignment shall be accompanied by a detailed packing list containing the following information: (a) (b) (c) (d) (e) (f) Name of the consignee. Details of consignment. Destination. Total weight of consignment. Handling and unpacking instructions. Bill of material indicating contents of each package. The supplier shall ensure that the bill of material is approved by the purchaser before despatch TECHNICAL REQUIREMENT FOR 11KV CURRENT TRANSFORMERS The Current Transformers under this specification shall conform to the parameters given below:

20 Sl. No. Item Specification 11KV 1. Type of CT/ Installation Single phase, dead tank, oilfilled / Poly Crate hermetically sealed/ outdoor, self-cooled. 2 Type of mounting Pedestal type 3 Suitable for system frequency 50 HZ 5% 4 Rated Voltage (KV rms) 11 5 Nominal System Voltage (KV rms) 11 6 Highest System Voltage (KV rms) 12 7 Current Ratio (A/A) A 8 Method of earthing the system where the Effectively earthed current transformers will be installed 9 Rated continuous thermal current (A) 120% of rated primary current 10 Acceptable limit of temperature rise above 50 0 C ambient temperature for continuous operation at rated continuous thermal current (a) Winding 40 0 C (b) Oil 35 0 C (c) External surface of the core, metallic parts in contact with or adjacent to, insulation C /50 micro second lighting impulse 95 withstand voltage (KVP) (dry) 12 1 Minute dry power frequency withstand 28 voltage primary (KV rms) 13 1 Minute dry power frequency withstand 3 voltage secondary (KV rms) 14 Minimum creepage distance of porcelain Housing (mm) 350

21 15 Rated short time withstand current for 3 25 second duration at all ratios (KA rms) 16 Instrument security factor at all ratios for Not more than 5.0 metering core 17 Maximum rated short time thermal current 92 density of the primary winding copper conductor (A/mm2 ) at all ratios 18 Application, current ratio, output burden, Enclosed in separate sheets for accuracy class, minimum knee point each rating of the current voltage, secondary winding resistance, Transformers. maximum excitation current at minimum knee point voltage etc. 19 Type of Core Torroidal type 20 Seismic acceleration 0.15g (Vertical) 0.3g (Horizontal) 21 Accuracy class of standard C.T to be used 0.05 or better. during testing towards determination of ratio errors and phase angle errors for metering cores. REQUIREMENT FOR 12KV CURRENT TRANSFOMERS OF RATIO (a) A/ 1 1 A Maximum No. of Cores Core No. Current ratios (A/A) Output burden VA Accuracy class as per IS: 2705 Minimum knee point voltage (V k ) at all ratios in volts CT resistance R CT in ohms at 75 0 C at all ratios at highest Maximum excitation current at 50% of Vk in ma at all ratios Instrument security factor Remarks tap

22 / / Two 400/1 - PS /1 - PS TEST i)type TEST The current transformers, offered should have been subjected to the following type tests in an independent NABL approved test laboratory or CPRI or any International Lab. Accredited Cooperation (ILAC).. The bidder shall furnish four sets of type test reports along with the offer for 0.5 accuracy class C.Ts. These tests must not have been conducted earlier than 05(Five) years from the date of opening of the bid. For any change in the design/type already type tested and the design/ type offered against this specification, the purchaser reserves the right to demand repetition of some or all type tests without any extra cost to NESCO in the presence of NESCO s representative at the cost of the supplier. Lightning Impulse Voltage Test and High voltage power frequency wet withstand voltage Test. Short time current test Temperature rise test Determination of errors or other characteristics according to the requirements of the appropriate designation and accuracy class as per individual part of IS:2705. Instruments Security Test IP-55 Test on Secondary Terminal Box Lightning Impulse Test and High Voltage power frequency wet withstand voltage Tests must have been carried out on the same transformers. After the current transformers have been subjected to lightning Impulse Test and High Voltage power frequency set withstand voltage tests, they must have been subjected to all the routine tests as per IS:2705 (part-i to IV). ii)routine TESTS. The following routine tests shall be conducted on each Current Transformer in the presence of representatives of NESCO. Appearance and Dimensional Check Verification of Terminal Marking and polarity Verification of all individual parts/ components of the Current Transformer so as to ensure to have compiled the above specification Measurement of Insulation Resistance

23 Power frequency Dry withstanding Test on Primary and Secondary winding including primary intersections Over- Voltage Interturn test Knee point voltage and excitation current measurement for PS class cores Secondary winding resistance measurement Determination of errors ISF Test Leakage Test Magnetization Characteristics of the Current Transformers Turn ratio error of PS class cores iii)test REPORTS Four copies of type test reports shall be furnished to the purchaser with the tender offer for 0.2 accuracy class CTs. Copies of acceptance test reports and routine test reports shall be furnished to the purchaser. One copy will be returned, duly certified by the purchaser and only thereafter shall the materials be dispatched. All records of routine test reports shall be maintained by the supplier at his work for periodic inspection by the purchaser All test reports of tests, conducted during manufacture shall be maintained by the supplier. These shall be produced for verification as and when required for by the purchaser TECHNICAL SPECIFICATION FOR 11KV OUTDOOR VACUUM CIRCUIT BREAKER 12.1 SCOPE This specification covers design, engineering, manufacture, testing, inspection before dispatch, packing, forwarding, transportation, insurance during transit, delivery to site/ stores of 11KV outdoor Vacuum circuit Breaker for use in the Capacitor Banks. All vacuum circuit breakers must be manufactured by ISO 9000 certified Organization and shall have been type tested at CPRI or any Govt. approval laboratory within five years as on the date of bid opening and in satisfactory operation for a period not less than three years. The scope of supply includes the provision of type tests at any of the NABL accredited Laboratory /International Lab. Accredited Cooperation (ILAC) / CPRI within last 5 Years. The Dimension of Type Tested VCBs can only be accepted. The scope also includes G.I. supporting structure for the circuit breaker and current and potential transformers, operating mechanism, local/ remote control cabinet, relay control panel, foundation bolts, all the accessories and auxiliary equipment mandatory spares and special tools for satisfactory installation and operation. The circuit breakers shall conform in all respects to the highest standards of engineering, design, workmanship, this specification and the latest revisions of relevant standards at the time