NUCLEAR POWER CORPORATION OF INDIA LIMITED (A Government of India Enterprise) TECHNICAL SPECIFICATION OF 220 KV CAPACITOR VOLTAGE ANSFORMERS FOR KAIGA GENERATING STATION-1&2
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 1 SECTION-C 1.0 SCOPE OF SUPPLY / WORKS / SERVICES. 1.1 This specification covers the design, engineering, material, construction features, manufacture, inspection and testing at the Contractor's/sub-contractor's works, packing, transportation and delivery at site. 1.2 It is not the intent to specify completely herein, all details of design and construction of the equipment. However, the equipment shall conform in all respects to high standards of engineering, design and workmanship and be capable of performing continuous commercial operation up to the CONACTOR'S guarantees in a manner acceptable to the PURCHASER, who will interpret the meaning of drawings and specifications and shall be entitled to reject any work or material which, in his judgement, is not in full accordance therewith. 1. The scope also includes but not limited to the following items / services described herein and elsewhere in the tender package. 1..1 Whether called for specifically or not all accessories required for normal operation of equipment are deemed to be considered as a part of the CONACTOR'S scope of supply. 1..2 Training of Purchaser's personnel at purchaser s site on installation, maintenance, carrying out adjustments etc. 1.4 In case of SF 6 gas filled CVT, scope of supply shall include SF 6 gas density monitor supply for remote annunciation and protection tripping of respective breaker in case of SF 6 leakage. 2.0 CONTENTS: Description Clause Codes and Standards Specification of Main Equipment and Accessories 4 Equipment Construction & Design Details 5 Inspection & Testing 6 Quality Surveillance 7.0 CODES AND STANDARDS.1 The design, material, manufacture, assembly, inspection, testing and performance of Capacitor Voltage Transformer and other associated equipments shall comply with latest editions (including amendments thereto) of all currently applicable statutes, regulations and safety codes in the locality where the equipment will be installed. The equipment shall also conform to the latest applicable standards. Nothing in this specification shall be construed to relieve the Contractor of his responsibility.
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 2.2 In case of conflict between the standards and this specification, requirements of this specification shall govern.. Other national standards are acceptable if they are established to be equal to or superior to the listed standards. In all such cases, however, copies of English translation of such national standards shall be attached to the tender. The tenders not complying with this requirement are liable for rejection..4 The list of some of the applicable codes and standards are given below. Sl No. Standard No. Title of the Standard 1 IS-5 Colours for ready mixed paints and enamels 2 IS-5 New Insulating Oil IS-51 Cold rolled low carbon steel sheets and strips. 4 IS- 800 General Construction in Steel- Code of Practice 5 IS- 808 Dimensions for hot rolled steel beams, columns, channels and angle sections 6 IS-129 Steel Tubes, Tubular and Other Wrought Steel Fittings 7 IS-189 Criteria for earthquake resistant design of structures 8 IS-1897 Copper strip for electrical purposes 9 IS-2551 Danger notice plates 10 IS-26 Methods of testing uniformity of coating of zinc coated articles 11 IS-2629 Recommended practice for hot dip galvanising on iron and steel 12 IS-4759 Hot-dip zinc coatings on structural steel and other allied products 1 IS-5561 Specification for Electric Power Connectors 14 IS-5621 Hollow insulators for use in electrical equipment 15 IS-1122 Methods for Partial Discharge Measurements 16 IS-826 Methods for radio interference test on high voltage insulators 17 IS-115 Guide for uniform System of Marking and Identification of Conductors and Apparatus. 18 IS 16227-1 / Instrument transformers - General requirements IEC 61869-1 19 IS 16227-5 / IEC 61869-5 Instrument Transformers - Additional Requirements for Capacitors Voltage Transformers 20 IS-948/ Coupling capacitor and capacitor dividers IEC 6058 21 IEC 60481 Coupling device for power line carriers system 22 IS-1072 / IEC-6076 Specification of technical grade Sulfur Hexafluoride (Sf6) for use in electrical equipment 2 IEC 61462 Composite hollow insulators - Pressurized and unpressurized insulators for use in electrical equipment with rated voltage greater than 1000 V 24 IEC 60815 Selection & dimensioning of HV insulators intended for use in polluted conditions
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 25 IS / IEC 60529 Degrees of protection provided by enclosures (IP code) 4.0 SPECIFICATION OF MAIN EQUIPMENT AND ACCEESSORIES Sl No. Particulars Specification 1.0 Type of mounting Pedestal mounted on GI structure 2.0 Highest voltage for equipment 245 KV at 50 Hz.0 Installation Outdoor 4.0 Insulation Withstand Characteristics 4.1 Power frequency withstand kv 460 (RMS) 4.2 Lightning impulse withstand voltage, 1050 kv (Peak) 5.0 Radio interference voltage 1000 μv at 154 kv (rms) 6.0 Partial discharge level at rated voltage Less than 10 (Pico Coulombs) for capacitance divider 7.0 Design requirements 7.1 Rated primary voltage 220,000/ 7.2 Rated secondary voltage S1 110/ V S2 110/ V S 110/ V 7. Method of connection Primary winding Star S1 Star S2 Star S Star 7.4 Application S1 Metering S2 Protection S Protection 7.5 Rated Burden/Phase S1 100 VA S2 100 VA S 100 VA 7.6 Rated total thermal burden 1000 VA 7.7 Accuracy class S1 0.2 S2 P S P 7.8 Rated voltage factor 1.2 continuous 1.5 for0 Sec 7.9 Total equivalent capacitance (pf) 8800 (+)10%, (-)5% 7.10 Material of primary & secondary windings of electromagnetic unit Copper
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 4 7.11 Suitability for high frequency carrier Required coupling 7.12 Maximum winding temperature As per IEC 61869 7.1 Minimum Secondary cable size S1 10 Sq. mm stranded copper S2 4 Sq. mm stranded copper S 4 Sq. mm stranded copper 7.14 Specific Creepage distance 25 mm/kv 7.15 Corona extinction voltage 156 kv RMS 7.16 Power frequency withstand voltage i) Between LV (HF) terminal and earth 10kV for exposed terminals 4kV for enclosed terminals ii) For Secondary winding kv rms. 7.17 Damping device Passive ferroresonance suppression circuit comprising of permanently connected loading resistor, a saturable inductor and an air gap loading resistor. 5.0 EQUIPMENT CONSUCTION AND DESIGN DETAILS 5.1 General Technical Requirements 5.1.1 The transformers shall be single phase units and shall be supplied with its terminal box. 5.1.2 The CVT shall be suitable for mounting on existing support structures at site. (Dimension drawing of existing CVT mounting is attached in Annexure-1 for reference). 5.1. Its housing shall have profile meeting with IEC-60815 and with required minimum creepage distance corresponding to heavy pollution environment. The insulator shed configuration should be of the "Alternate". 5.1.4 The transformer including hollow insulator shall be sufficiently strong to withstand stresses due to wind pressure, earthquake, conductor tension at the terminals and forces due to dynamic phase short circuit current. In addition, it shall withstand the stresses due to its own weight and internal pressure if any. Cantilever strength of the offered CVT shall be not less than 500 Kg. 5.1.5 The transformer shall be suitable for a trouble free and maintenance free performance. Therefore, the bidder shall ensure that the sealing of transformer is properly achieved. In this connection the arrangement provided by the bidder at various locations including the following ones shall be described, supported by sectional drawings.
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 5 Locations of emergence of primary and secondary terminals. Interface between porcelain/ composite housing and metal tank/s. Cover of the secondary terminal box. 5.1.6 Insulating oil / SF6 gas required for first filling of the instrument transformer shall be covered in bidder s scope of supply. The oil shall meet the requirements of IS 5 / SF6 gas shall meet the requirement of IS 1072 / IEC 6076. 5.1.7 The wiring diagram for the interconnection of the three single phase CVTs shall be provided inside the marshalling box. 5.1.8 The primary terminal connector required for connection of the CVT to purchaser s bus bar (single ACSR moose conductor), shall be in bidder s scope. 5.1.9 The mounting base arrangement for CVT shall be submitted along with offer. 5.2 Constructional features 5.2.1 The metal tanks shall have bare minimum number of welded joints so as to minimise possible locations of oil leakage / SF6 leakage. The metal tanks shall be made out of mild steel/stainless steel/aluminium alloy, depending on the requirement. The thickness and metal used for fabrication of tank shall be indicated by the bidder in general arrangement drawings to be submitted with the offer. 5.2.2 Surface Finish of all non current carrying metal surfaces exposed to atmosphere shall be given two primer coats of zinc phosphate and two coats of epoxy paint with epoxy base thinner. All metal parts not accessible for painting shall be made of corrosion resisting material. All machine finished or bright surfaces shall be coated with a suitable preventive compound and shall be suitably wrapped or otherwise protected. All paints shall be carefully selected to withstand tropical heat and extremes of weather within the limits specified. The paint shall not scale off or wrinkle or be removed by abrasion due to normal handling. All equipment shall be factory painted. The prime and finish coats shall have a combined minimum dry film thickness of 50 to 75 Microns. 5.2. The housing shall be made of homogeneous, vitreous glazed porcelain of high mechanical and dielectric strength. Glazing of porcelain shall be of uniform brown or dark brown colour with a smooth surface arranged to shed away rain water or condensed water particles. The details of location and type of joint, if provided on the porcelain, shall be furnished by the bidder along with the offer. 5.2.4 In case of SF6 filled CVT; insulator shall be explosion proof design, composite / porcelain. A controlled pressure relief device shall be provided to eliminate unacceptable mechanical stresses in the housing. 5.2.5 The hollow insulators shall be cemented to cast aluminum alloy flanges and hermetically sealed by non-ferrous metallic plate with neoprene rubber or equivalent O-ring gasket.
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 6 5.2.6 Details of attachment of metallic flanges to the porcelain / composite insulators shall be brought out in the offer. 5.2.7 In case of SF6 filled CVT, SF6 leakage rate shall be less than 0.2% per year. 5.2.8 Oil filling, drain plug and oil sight glass having low oil level indication mark shall be provided in case of oil filled electromagnetic unit of CVT. 5.2.9 Oil filling and draining hermetically sealed plugs / SF6 gas online filling plug shall be provided. 5.2.10 In case of SF6 gas filled CVT, suitable SF6 gas density monitoring device with NO / NC contacts shall be provided to facilitate the remote annunciation and tripping in case of SF6 leakage. Provision shall be made of online gas filling also. 5.2.11 Secondary terminals of CVT shall be bought out in a weatherproof terminal box having enclosure protection of IP: 55 as per IS / IEC. The terminal box shall be provided with removable gland plate of adequate size and gland/s suitable. The dimensions of the terminal box and its openings shall be adequate to enable easy access and working space with use of normal tools. 5.2.12 Corona shields (grading rings) shall be of copper or corrosion resistant aluminium. 5.2.1 Nuts and bolts or screws used for fixation of the interfacing porcelain bushings for taking out terminals shall be provided on flanges cemented to the bushings and not on the porcelain. 5.2.14 For gasket joints wherever used nitrite butyl rubber gaskets shall be used. The gasket shall be fitted in properly machined groove with adequate space for accommodating the gasket under compression. 5.2.15 Terminal and polarity marks shall be indelibly marked on each CVT 5.2.16 All ferrous parts including nuts, bolts, plain and spring washers of size M 10 and above, support channels, structures etc. shall be hot dip galvanised to conform latest version of IS 2629 or any other equivalent standard. All other fixing nuts, bolts, washers of size below M 10 shall be made out of stainless steel. 5.2.17 Metal tank of the CVT shall be provided with two separate earthing terminals for bolted connection to 50 x 5 mm MS flat for connection to station earth-mat. 5.2.18 The CVT shall be provided with suitable lifting arrangement, to lift the entire unit. The lifting arrangement shall be clearly shown in the general arrangement drawing. Lifting arrangement (lifting eye) shall be positioned in such a way as to avoid any damage to the porcelain housing or the tanks during lifting for installation/transport. Necessary string guides shall be offered which shall be of removable type. 5. Technical Particulars for Capacitor Voltage Transformers
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 7 5..1 Capacitor voltage transformer shall consist of coupling capacitors (a capacitor divider) and an electromagnetic unit housed in independent, non-oil communicating hermitically sealed compartments. It shall be so designed and inter-connected that the secondary voltage of the electromagnetic unit is substantially proportional to and in phase with the primary voltage applied to the capacitor divider unit. The capacitance divider consists of primary and secondary capacitance housed in high quality porcelain insulators filled with oil/ SF 6. The electromagnetic unit comprises compensating reactor, intermediate transformer and protective and damping devices and should have a separate terminal box with the entire secondary terminal brought out. 5..2 CVT should have secondary windings, two of which are intended for protection and one for metering. 5.. CVTs shall be suitable for high frequency (HF) coupling required for power line carrier communication. Carrier signal must be prevented from flowing into potential transformer (EMU) circuit by means of a RF choke/reactor suitable for effectively blocking the carrier signals over the entire carrier frequency range i.e. 40 to 500 KHz. Details of the arrangement shall be furnished along with the bid. H.F. terminal of the CVT shall be brought out through a suitable bushing and shall be easily accessible for connection to the coupling filters of the carrier communication equipment, when utilised. Further, earthing link with fastener to be provided for HF terminal. 5..4 The coupling capacitor unit and the electromagnetic unit should be housed in independent, non-oil communicating hermitically sealed compartments. 5..5 Coupling Capacitor 5..5.1 The coupling capacitor/capacitor divider unit shall consist of an assembly of capacitor elements of high grade aluminium foil and pure ultra thin cellulose paper, housed inside porcelain insulator with corrosion resistant aluminium alloy end fittings. The Unit is to be filled completely with degassed insulating oil / SF6 gas. The oil volume changes caused by temperature variations should be compensated by a stainless steel bellow. The bellow should be pressurized by inert gas so as to have a positive pressure even at low ambient temperature. 5..5.2 The material, construction and assembly of capacitor unit shall be such that the capacitance value does not change with time and that the influence of temperature is kept to a minimum. 5..5. The live mating surface used for the connections between two capacitor units shall be either of brass or tinned copper or corrosion resistant aluminium alloy to provide good electrical joint. 5..6 Electro-magnetic Unit (VT) 5..6.1 The VT shall be housed in a hot dip galvanized tank at the base of the coupling capacitor.
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 8 5..6.2 The electro-magnetic unit comprising compensating reactor, intermediate transformer and protective and damping devices should have a separate hot dip galvanised terminal box with all the secondary terminals brought out. The damping devices, which should be permanently connected to one of the secondary windings, should be capable of suppressing the ferro-resonance oscillations. 5..6. Voltage transformers shall be given tropical treatment for satisfactory operation in hot and humid climate. 5..6.4 The secondary terminal box for the voltage transformers shall include 10A HRC fuses in each secondary circuit for metering and protection. 5..6.5 Hot dip galvanized terminal box shall be provided for mounting carrier protection device, surge protection device. 5..7 Voltage transformers shall be provided with the following accessories: 5..7.1 Rating & diagram plate as required by relevant standards. 5..7.2 Bushings/connections/terminations required between the capacitor and the primary of the VT. 5..8 Performance Requirements 5..8.1 The capacitor voltage transformers should be designed to meet the requirements for accuracy, burden and ferro-resonance requirements specified in this specifications and transient response specified in relevant standards. 5..8.2 The capacitor voltage transformers should be thermally and dielectrically safe when the secondary terminals are loaded with the guaranteed thermal burdens. 5..8. The maximum temperature rise shall not exceed the figures given in applicable standards for operation considering the design ambient temperature of 50 o C. 5..8.4 The capacitance shall be designed for a preferred capacitance rating of the value as stated in this specification for rated system voltage and rated power frequency. If the capacitor offered is designed for any other value, the TENDERER shall indicate reasons /advantages of the same. 5..8.5 The high frequency capacitance values shall be within the limits of 80% and 150% of the rated capacitance, for a frequency range from 40 to 500 KHz and at the temperature limits specified. 5..8.6 The values of stray capacitance and conductance of the low-voltage terminal, with respect to the earth terminal, shall be as low as possible. The terminal design and arrangement shall be such that adverse atmospheric effects of humidity, dust, etc. does not increase the generally recommended limiting values of the stray capacitance and conductance, for coupling capacitor/cvt as stated in applicable standards.
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 9 5..8.7 The accuracy of capacitor voltage transformer shall remain within the specified class when a carrier coupling device is connected to the earth lead of the intermediate voltage capacitor. 5..8.8 The internal insulation of CVTs shall be designed to safely withstand specified over voltage. 6.0 INSPECTION AND TESTING 6.1 General 6.1.1 The routine tests, acceptance tests, special tests and type tests are covered in this section. Inspections and tests at raw material stage, semi finished or module level are detailed in the typical QAP given in Clause-7. 6.1.2 All the equipments offered should have been successfully type tested as per the relevant standards, amended up to date. In case the equipment of the type and design offered has already been type tested, bidder shall furnish type test reports before proceeding with manufacture. Type tests must not have been conducted earlier than five years from the date of opening of bids. In case the type tests were conducted earlier than five years, such type tests shall be carried out by the successful bidder free of cost before commencement of supply. The undertaking to this effect shall be furnished along with the offer without which the offer shall be liable for rejection. As a part of technical offer, bidder shall include a tabulation detailing various type tests on each type of equipment along with applicable type test certificate number, details of the equipment subjected to type test, place of testing and final results. 6.1.4 In the offered CVT, if there are changes in the components or in the design/type as compared to the CVT already type tested, the purchaser reserves the right to demand repetition of tests without any extra cost before commencement of supply. The bidder shall bring out in his offer all such changes made in components, materials, design etc. as the case may be and likely effects of such changes on type qualification. 6.1.5.1. Type Tests Sr. No. Test 1 Impulse voltage withstand test 2 Wet test for outdoor type transformers Power frequency voltage test 4 Temperature rise test 5 Test for accuracy/ errors 6 Corona inception and extinction test 7 Radio Interference Voltage measurement 8 Chopped impulse test 9 Short circuit withstand capability test 10 Ferro resonance tests
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 1 0 11 Transient response tests 12 Tightness test of EMU 1 Type test for carrier frequency accessories 14 Measurement of capacitance and tan δ test 15 Seismic withstand capability 16 Verification of the degree of protection 18 Enclosure tightness test at ambient temperature 19 Pressure test for the enclosure 20 Type test for hollow insulators 6.1.5.1.20. Type tests on capacitor divider units as per IEC 6058 6.1.5.1.20.1. Measurement of high frequency capacitance and equivalent series resistance 6.1.5.1.20.2. Stray capacitance and stray conductance measurement on LV side 6.1.5.1.20.. Determination of temperature coefficient of capacitance. 6.1.5.2. Routine Tests Sr. No. Test 1 Verification of terminal marking and polarity 2 Partial discharge measurement Test for accuracy 4 Measurement of capacitance and dielectric dissipation factor 5 Power frequency withstand tests on primary terminals 6 Power frequency withstand tests on secondary terminals 7 Power frequency withstand tests between sections 8 Ferro-resonance check 9 Test for carrier frequency accessories 10 Pressure test 11 Enclosure tightness test at ambient temperature 12 Dew point measurement test for SF6 gas filled CVT. 1 SF6 alarm / lockout check for SF6 gas filled CVT. 6.1.5.. Special tests Sr. No. Test 6.1.5..1 Tightness design test of capacitor units 6.1.5..2 Thermal coefficient test 6.1.5.. Mechanical tests 6.1.5..4 Transmitted over voltage test 6.1.5..5 Internal arc fault test 6.1.5..6 Enclosure tightness test at low and high temperatures 6.1.5..7 Corrosion test 6.1.5..8 Fire hazard test 7.0 QUALITY SURVEILLANCE 7.1. General
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 1 1 7.1.1. The general requirements regarding quality assurance, organisational set up for quality surveillance, qualification and experience details of personnel of quality Assurance department, QA Manual, Mock up test procedures etc. are covered in Section C-0 and the GCC. 7.2. Quality control plan This indicates the requirements expected from the contractor/manufacturer of the Instrument Transformers. Subsequent to the placement of Purchase Order contractor/manufacturer shall submit for purchaser s approval a quality assurance plan in line with this document incorporating specific document numbers for format of records, acceptance norms and reference documents Abbreviations: V P W H Verified by Performed by Witnessed by (After lapse of due notice to NPCIL, manufacturer may proceed with manufacture) Hold (Unless a written clearance is obtained from NPCIL, manufacturer shall not proceed to next stage) 1 NPCIL QS 2 Prime Supplier / EPC Contractor Approved External Laboratory or Sub Vendor QC (if vendor QC / facility not available.) AD- PC Approved Document such as Tender Document, Purchase order, Drawings & Test Procedures - Test Report - Plant Standard CHP - Customer Hold Point (Customer is NPCIL) IS - Indian Standards IEC - International Electro-technical Commission standards - Institute of Electronics and Electrical Engineers standards Notes: Wherever V & W are both indicated, NPCIL QS to witness test or review s. s not more than five year old from date of opening of Part-I of tender shall be reviewed for acceptance. Otherwise test shall be carried out. Minor: The characteristic of a component, process or operation whose failure neither materially reduce the usability of the product in operation, nordoes it affect the aesthetic aspects. : The characteristic of a component, process or operation whose failure may cause operation failure which cannot be readily corrected at site or cause substandard performance, increased erection and maintenance cost, reduced life or seriously affect aesthetics or ergonomics.
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 1 2 Critical: The characteristics of a component, process or operation failure of which will surely cause operating failure or intermittent troubles which is difficult to rectify at site or render the unit unfit for use or safety hazards. Failure of a characteristic means failure to meet the acceptance norms. Sampling: Generally in accordance with IS: 2500. Sampling will be used as under:- If witness is carried out by Prime contractor, NPCIL will witness on sample basis, or if witness of tests is carried out by subcontractor, Prime contractor will witness on sample basis. Any deviation to this QAP shall be brought out by vendor in his offer failing which this QAP shall be complied with fully.
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 1 Quality Assurance Plan for Capacitor Voltage Transformer Sr. No. Component Characteristic Categor y Method Extent of check Extent of check Accep tance norms Format of record Agency V P W H Rem arks 1.0 Aluminium Foil a. Presence of foreign particles and surface finish b. Dimensions c. Tensile strength d. Foil purity e. Wet ability Visual measurement physical chemical Physical Sampling - Do - - Do - - Do - - Do - 2.0 Condenser tissue paper 1.Damage 2. a. Thickness b. Density. Dielectric Strength 4. Mineral Ash content 5. PH Value 6. Conductivity aqueous extract 7. Freedom from conducting path 8. Chlorine content 9. Loss Angle Visual measurement physical Electrical Chemical Chemical Electrical Electrical Chemical Electrical Sampling - Do - - Do - - Do - - Do - - Do - Do - Do - Do -
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 1 4.0 Enamelled Copper wire 1. Insulation defect. 2. Dimensions. Electrical resistance 4. Elongation 5. Jerk test 6. Resistance to Abrasion 7. Heat shock 8. Cut Through 9. Cure test 10. Solvent test 11. Break Down Voltage 4.0 Core 1. Surface Defects 2. Dimension. Magnetic property 5.0 Porcelain / composite insulator Electrical Measurement Electrical Physical Physical Physical Physical Physical Physical Chemical Electrical Visual Measurement Physical - Do - - Do - Do - Do - Do - Do - Do - Do - Do - Do - Do - Sampling Sampling 1. Dielectric strength HV Test IS/IEC IS/IEC 2. Visual, creepage & Measurement IS/IEC IS/IEC dimension. Temperature cycle Measurement IS/IEC IS/IEC 4. Pressure Test Measurement 5. Porosity Measurement Sample IS/IEC IS/IEC 6. Internal flaw Ultrasonic 7. Bending strength Measurement Sample IS IS 8. Bending Strength at 70 % of withstand bending strength Measurement IS IS
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 1 5 6.0 Tank & Tank cover 7.0 H.V. Bushing 1. Surface Defects 2. Dimension. Dielectric tests 8.0 Spark gap 1. Dimension 2. Breakdown voltage 9.0 Oil / SF6 All characteristics as per standard 10.0 Capacitor foil 1. Destructive check winding of foil 11.0 Stack pressure 1. Pressure 2. Height 9. Parallelism & Mechanical IS IS eccentricity 10. Hydrophobicity Mechanical (For composite insulator) 11. Chemical Mechanical Samplin composition (For composite insulator) g 12. Acceptance and Measurement IEC / IEC / Routine tests IS IS 1. Type test Measurement Samplin g IEC / IS IEC / IS 1. Dimensions. Measurement Sampling 2. Leakage test Physical. Fabrication Physical 1 4. Galvanizing / Physical 1 painting Visual Measurement Electrical Measurement Electrical Test Sampling IS / IS / IEC IEC Physical -do- Physical Physical 1 1 1 2 2 2 2 2
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 1 6 12.0 Drying & Impregnation 1.0 Pressing of stack after impregnation 14.0 Tests on complete Capacitor unit 15.0 Tests on Electromagnetic Unit 16.0 Tests on complete CVT. 1. Control of Process 1. Pressure 2. Height All routine tests Natural frequency test All routine tests Natural frequency test All routine tests All type tests Special tests Physical measurement Visual/Electrica l -do- Critical Critical -do- -do- Sampling Sampling IEC IEC IEC IEC IEC IEC IEC IEC IEC IEC 1 1 1 1 1 1
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 1 7 SECTION-D 1. GUARANTEED TECHNICAL PARTICULARS The TENDERER along with his offer shall furnish following guaranteed technical particulars for the Capacitance Voltage Transformers covered by this specification: Sl No. Description UOM Bidders Compliance 1.0 Manufacturer's name 2.0 Type (Oil/SF6).0 Designation 4.0 Applicable standards 5.0 Rated frequency 6.0 Number of secondary windings 7.0 Rated primary voltage 8.0 Rated secondary voltage Sec. winding - 1 Sec. winding - 2 Sec. winding - 9.0 Method of connections 9.1 Primary winding 9.2 Secondary winding Sec. winding - 1 Sec. winding - 2 Sec. winding - 10.0 Rated voltage factor Continuous 5 sec. 0 Sec. 11.0 Rated VA burden on secondary windings Sec. winding - 1 Sec. winding - 2 Sec. winding - 12.0 Rated power factor for secondary windings at rated VA Sec. winding - 1 Sec. winding - 2 Sec. winding - 1.0 Accuracy class of secondary windings 14.0 Class of insulation of windings 15.0 Maximum temperature rise of windings at 110% excitation at rated burden and at rated
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 1 8 frequency, when referred to specified ambient temperature (50 C) 16.0 Whether CVTs are suitable for carrier coupling 17.0 Capacitance values at rated frequency and at rated temperature for i) High voltage capacitance ii) Intermediate voltage capacitance iii) Equivalent capacitance for carrier coupling. 18.0 Natural Frequency of coupling 19.0 Self tuning frequency (capacitor part) 20.0 Band width 21.0 Maximum permissible impedance at power frequency of carrier coupling device 22.0 Rated temperature at which above values are indicated 2.0 Capacitance temperature coefficient 24.0 Rated intermediate voltage 25.0 Rated primary voltage of electromagnetic unit 26.0 Insulation withstand test voltages i) Power frequency test voltage for CVT ii) Capacitor voltage divider unit iii) Low voltage terminal of the capacitor voltage divider iv) Primary winding of electromagnetic unit v) Secondary winding of electromagnetic unit 27.0 1.2/50 microsecond lightning impulse withstand test voltage for capacitor units of CVT 28.0 250/2500 micro sec switching impulse withstand test voltage for capacitor units of CVT 29.0 Radio interference voltage at 1.1 x Um/ for frequency between 0.5 MHz to 2 MHz
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 1 9 0.0 Partial discharge Test voltage Magnitude 1.0 Corona Extinction Voltage 2.0 Minimum creepage distance for insulator housing.0 Insulator shed configuration details 4.0 Insulator shed profile drawing furnished 5.0 Mechanical strength of CVT actually provided 6.0 Whether the earth terminal of the voltage divider is provided i) If yes, the rated voltage ii) One minute power frequency withstand voltage 7.0 Whether the protective gap across the primary side of electromagnetic unit is provided in case of CVT i) If yes, the spark over voltage 8.0 Whether the series reactance/ high voltage choke/ compensating coil is provided in case of CVT i) If yes, rated voltage ii) One minute power frequency withstand voltage 9.0 Terminal box details i) Degree of protection ii) Whether space heater or anti-condensation paint is provided iii) Whether the cable glands are supplied loose iv) If yes, the size and quantity 40.0 Whether the following items are provided in a separate housing for CVT HF ground switch, Drain coil, Over voltage suppressor for HF coupling unit, If yes, indicate the values for
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 2 0 i) Drain coil ii) Over voltage suppressor iii) Degree of protection for separate housing 41.0 Whether separate TB for VHF terminal provided for carrier coupling 42.0 Provision made for accepting the changes in oil volume 4.0 Make of hollow porcelain / composite insulator housing 44.0 Overall dimensions 45.0 Shipping dimensions 46.0 Weight 47.0 Shipping weight 48.0 Quantity of oil / SF6 gas and standard to which it conforms 49.0 All type tests as per Section C, Clause-6 carried out 50.0 Drawings/information as called for under Clause-6 submitted with the bid. 51.0 Mean Time between Failures (MTBF) 52.0 Recommended Test Frequency 5.0 Impact of ageing on equipment performance 54.0 Life in terms of i) Number of cycles of operation ii) Years of operation. 55.0 Recommended calibration frequency 56.0 SF6 gas filled pressure (if applicable) 57.0 SF6 gas alarm pressure (if applicable) 58.0 SF6 gas lockout pressure for CB tripping (if applicable) 59.0 SF6 gas pressure where refilling is required (if applicable)
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 2 1 2. SCHEDULE OF PROPOSED EQUIPMENT MANUFACTURER S GENERAL PARTICULARS The TENDERER shall furnish here the following general particulars of the Equipment manufacturers of all the equipment covered in this specification: 1.0 Name of the manufacturer: 2.0 Address of the manufacturer:.0 Telegraphic and email addresses of the manufacturer: 4.0 Name and designation of the Officer of the manufacturer to whom all reference shall be made for expeditious technical co-ordination: 5.0 Place of manufacture & assembly: 6.0 Current registration number with DGS & D: 7.0 Whether service facilities available, if so details: 8.0 Whether sufficient spares are available in stock: 9.0 Are all technical particulars called for in the section D filled up: 10.0 Are all deviations pointed out in the schedule of deviation: SEAL OF COMPANY SIGNATURE DESIGNATION COMPANY DATE
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 2 2. DRAWINGS TO BE SUBMITTED ALONG WITH THE TENDER As part of the proposal the TENDERER shall furnish the following for preliminary study: a) General arrangement drawing for Capacitor Voltage Transformers, loading on foundation etc. b) Detailed literature/catalogues of the equipment being offered under this contract. f) Any other drawings necessary for the correct and complete understanding of the proposal. NOTE All drawings and data shall be annotated in English. SEAL OF COMPANY SIGNATURE DESIGNATION COMPANY DATE
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 2 4. PERFORMANCE DATA, INCLUDING PERFORMANCE CURVES ETC. TO BE SUBMITTED ALONGWITH THE TENDER Tenderer shall submit a tabulation indicating rating of the CVT type tested, type tests carried out, severity levels, place of type testing, type test certificate reference number, data of testing and whether any modification to the type tested equipment has been carried out after type testing and whether the type tested equipment and the equipment offered are identical. SEAL OF COMPANY SIGNATURE DESIGNATION COMPANY DATE
220 KV CAPACITOR VOLTAGE ANSFORMERS P a g e 2 4 Annexure-1 Existing CVT Mounting Dimension Drawing