TECHNICAL SPECIFICATION OF ELECTRICAL MATERIALS Insulators & Lightening Arrestor GROUP K & L

Transcription

1 TECHNICAL SPECIFICATION OF ELECTRICAL MATERIALS Insulators & Lightening Arrestor GROUP K & L

2 GROUP C Insulator Sl. No. Item Description Unit Qty KV Pin Insulator No KV Disc Insulator 45KN (T&C type ) 3 11 KV Disc Insulator 45KN (B&S type ) 4 11 KV Disc Insulator 70KN (B&S type ) No No No KV Post Insulator No KV Lightning Arrestor No KV Stay Insulator No LT Stay insulator No LT Pin Insulator(105x80)mm No LT Pin Insulator(100x75)mm No KV Post Insulator No KV Pin Insulator No KV Disc Insulator(B&S) No KV Disc Insulator(T&C) No KV Lightening Arrestor(10KA) No KV Stay Insulator No 625 NB: 1. Bidders should put their authorized signature with office seal on each page of the documents. 2. Bidders should put their offer in the Guaranteed particulars column furnished in the tender documents.

3 3. Purchaser may ask to the bidder who will qualify in Techno- Commercial evaluation of the tenders for submission of Samples for verification, if required. 4. Purchaser reserves the right to increase or decrease the above quantities during placement of purchase order or may cancel any item/items without assigning any reason thereof. Dy. General Manager (C&P) NESCO, Balasore, Odisha

4 TECHNICAL SPECIFICATION 11 KV PIN INSULATOR 1.SCOPE : The specification cover the manufacture, testing at works supply and delivery of Porcelain insulators for overhead power lines with a nominal voltage below 12KV. Both Pin and Shackle type insulators are covered. 2. APPLICABLE STANDARDS: Except when they conflict with the specific requirements of this specification, the insulators shall comply with IS : IS:731 & IS: 3188 or the latest version thereof. 3. GENERAL REQUIREMENTS: The porcelain shall be sound, free from defects, thoroughly vitrified and smoothly glazed. The design of the insulators shall be such that the stresses due to expansion and contraction in any part of the insulator shall not lead to its deterioration. The glaze shall be brown in color for insulators. The glaze shall cover the entire porcelain surface parts except those areas that serve as supports during firing. The insulators shall be suitable for use with all Aluminum Conductor or Copper conductor or ACSR upto 100 sq.mm. The insulators should withstand the conductor tension the reversible wind load as well as the high frequency vibrations set due to wind. 4. SYSTEM CONDITIONS: Frequency : 50 Hz Nominal System Voltage : 11KV Maximum System Voltage LT System : 12 KV Minimum LT Voltage : 11KV Power frequency one minute withstand Voltage(wet): 35KV 5. TYPE OF INSULATORS: The standard Pin insulators shall be of designation Type B of IS : 731 or its latest revision. 6. TESTS: a. Type tests: a) Visual examination b) Verification of dimensions

5 c) Temperature cycle test d) Dry one minute power frequency withstand test e) Wet one minute power frequency withstand test f) Mechanical strength test g) Porosity test 6.2 Acceptance test: The insulators, after having withstood the routine test shall be subjected to the following acceptance tests in the order given below: a) Verification of Dimensions. b) Temperature cycle test c) Mechanical strength test d) Porosity test 6.3 Routine tests: ii) Visual examination 7.TESTING FACILITIES: a. The Bidder must clearly indicate what testing facilities are available in the works of the manufacturer and whether the facilities, are adequate to carry out all the routine as well as type tests. These facilities should be made available to Purchaser s Engineers if deputed to carry out or witness the tests. If any tests cannot be carried out at the manufacturer s works, the reasons should be clearly stated in the tender. b. The Bidder shall furnish detailed type test reports of the offered 11KV Pine insulator as per clause 6.1 of this specification. All the above Type Tests shall be carried out at laboratories, which are accredited, by the National Accreditation Board of Testing and Calibration Laboratories (NABL) of Government of India to prove that the insulators offered meet the requirements of the specification. These Type Tests should have been carried out within five years prior to the date of opening of this tender. c. There offered L.T. shackle Insulators & pin insulators are already fully Type Tested at Laboratories accredited by the National Accreditation Board of Testing and Calibration Laboratories (NABL) within five years prior to the date of opening of the tender. There is no change in the design of Type tested L.T. shackle Insulators and those offers against this tender.

6 8. Drawings : The tender shall be accompanied with the detailed drawings showing the dimensions of the individual insulator, giving all the design dimensions of various component parts. Generally it shall be as per IS. 9. MARKING: a. Each insulator shall be legibly and indelibly marked to show the following: i) Name of Purchaser- NESCO ii)name or trade mark of the manufacturer iii) Year of manufacturer iv) ISI certificate, mark, if any. b. Marking on porcelain shall be applied before firing. 10. Packing : All insulators shall be packed in crates or boxes suitable for rough handling. Packing shall be marked with the strength and voltage rating.

7 GUARANTEED TECHNICAL PARTICULARS 11 KV PIN INSULATOR Sl. Description Specific Requirement Bidders offer No. Name of Manufacturer. & Address To be specified by the bidder Location of type testing To be specified by the bidder 1 Applicable standard Normal working voltage IS: 731,IS 3188 or the latest version 11 thereof Kv (rms) 2 High system voltage. 12 Kv (rms) 3 Visible Discharge voltage dry PF. 9 Kv (rms) 4 1 Minute withstand voltage wet PF. 65 Kv (rms) 5 1 Minute withstand voltage Kv (rms) 6 PF puncture withstand voltage. 110 Kv (rms) 7 Impulse withstand voltage : 8 Impulse flashover voltage : (+ ve) 80 Kv peak (- ve) 80 Kv peak (+ ve) 90 Kv peak (- ve) 120 Kv peak 9 Minimum failing load. 5 KN. 10 Minimum creepage distance. 240 mm. 11 Colour of glaze. Brown. 12 Weight per unit. 1.4 Kg. (Apprx.) 13 Size of insulator. (Height) 125 mm. (Diameter 125 mm. 14 Material of thimble. ) Lead. 15 Steel head. Small head. 16 Standard. IS : 731/ Tolerance. Tolerance will be allowed as per IS : 731/1971 or latest amendments if any. 18 Drawing To be submitted 19 Conforming standard As per IS NB- Every insulator should bear the marking of manufacturer s name & Purchaser s name and ISI mark. Name & Signature of Bidder with seal

8 TECHNICAL SPECIFICATIONS OF 33 KV PIN INSULATOR 1.0 Scope of Work: This Specification covers design, engineering, manufacture, assembly, stage testing, inspection & testing before supply and delivery at site of the 33KV Pin Insulator. 2.0 APPLICABLE STANDARDS Unless otherwise stipulated in this specification, the insulators shall comply with the Indian standard specification IS: and the insulator fittings with IS:2486(Pt. I )-1971 and IS:2486(Pt. II)-1974 or the latest version thereof. 3.0 INSULATORS 3.1 General Requirements The Porcelain shall be sound, free from defects, thoroughly vitrified and smoothly glazed Unless otherwise specified, the glaze shall be brown in colour. The glaze shall cover all the porcelain parts of the insulator except those areas which serve as supports during firing or are left unglazed for the purpose of assembly The design of the insulator shall be such that stresses due to expansion and contraction in any part of the insulator shall not lead to deterioration. The porcelain shall not engage directly with hard metal Cement used in the construction of the insulator shall not cause fracture by expansion or loosening by contraction and proper care shall be taken to locate the individual parts correctly during cementing. The cement shall not give rise to chemical reaction with metal fittings, and its thickness shall be as uniform as possible. 3.2 Creepage Distance The minimum creepage distance shall be as under: Highest System Voltage Normal and Moderately Polluted Atmospheres(total) Heavily polluted Atmospheres(Total) (1) (2) (3) 36 KV 580 mm 840 mm Note: For insulator used in an approximately vertical position the values given in col.(2) or (3) shall apply. For insulators used in an approximately horizontal position, the value given in col. (2) shall apply but the value in Col.(3) may be reduced by as much as 20%. 3.3 Tests: The insulators shall comply with the following tests as per IS:

9 3.3.1 Type tests a) Visual examination b) Verification of dimensions c) Visible discharge test d) Impulse voltage withstand test. e) Wet power-frequency voltage withstand test. f) Temperature cycle test. g) Electro-mechanical failing load test. h) Mechanical failing load test (for those of type B strin insulator units to which electro mechanical failing load test (g) is not applicable. i) Twenty four hours mechanical strength test (for string insulators only when specified by the purchaser). j) Puncture test k) Porosity test and l) Galvanising test Acceptance Tests The test samples after having withstood the routine tests shall be subjected to the following acceptance test in the rder indicated below: a) Verification of dimensions. b) Temperature cycle test. c) Twenty four hours mechanical strength test(for string insulator units only when specified by the purchaser) d) Electro-Mechanical failing load test. e) Puncture test f)porosity test and g) Galvanising test Routine Test a)visual examination. b) Mechanical routine test (for string insulator units only) and c) Electrical routine test (for string insulator units only) 3.4 Marking Each Insulator shall be legibly and indelibly marked to show the following. a) Name and trade mark of the manufacturer. b) Month and year of manufacture c) Minimum failing load in Newtons d) Country of the manufacturer and e) ISI Certification mark,if any. f) Specific Parameters & Layout Conditions Marking on porcelain shall be printed and shall be applied before firing.

10 3.5 Packing All insulators (without fittings) shall be packed in wooden crates suitable for easy but rough handling and acceptable for rail transport. Where more than one insulator are packed in a crate, wooden separators shall be fixed between the insulators to keep individual insulators in position without movement within the crate. GURANTEED TECHNICAL PARTICULARS OF 33KV PIN INSULATOR Sl.No. Description Specified Bidder's offer 1 Manufacture Name 2 Address of Manufacture 3 Normal working voltage 33KV(rms) 4 5 High system voltage Visible Discharge Voltage dry PF 36KV(rms) 27KV(rms) 6 Dry Power frequency 1 Minute withstand voltage 95KV(rms) 7 Wet Power frequency 1 Minute withstand voltage 75KV(rms) 8 PF puncture withstand voltage 180KV(rms) 9 Impulse withstand voltage 170 KV 11 Minimum failing load 10KN 12 Minimum creepage distance 580mm 13 Colour of glaze Brown 14 Weight per unit To be submitted by bidder 15 Size of Insulator a) Height To be submitted by bidder b) Diameter To be submitted by bidder 16 Material of thimble Lead 17 Steel head Large head 18 Standard IS: 731/1971 Tolerance will be allowed as per IS:731/1971 Tolerance 19 or latest amendments if any. 20 Drawing & Sample To be submitted by bidder PACKING: All insulators shall be packed in wooden crates suitable for easy but rough handling & acceptable for road transport. Where more than one insulator are packed in a crate, Separator shall be fixed between the insulators to keep individual insulator in position without movement in the crate.

11 TECHNICAL SPECIFICATION 11 KV POST INSULATOR 1. Scope- This specification covers the manufacture, testing and works supply and delivery of 11KV post insulators. The Porcelain insulators shall conform to IS: ammended upto date. Small fittings like spring washers, nuts etc may be electro-galvanised. Frequency : ( 50 ± 3%)Hz Nominal System Voltage : 11 K V Maximum System Voltage : 12 KV No. of phases : 3 Power frequency one minute withstand(dry) : 75 KV Neutral Earthing arrangement System : Effectively Earthed 3.Requirements: The post type insulators shall be suitable for outdoor use and cap & base type. Caps & base shall have plain machined faces & zigs shall be used for drilling bolt holes on the cap & in the base for easy & perfect assembly. Regarding Test for Mechanical strength for post Insulators, all the necessary tests are as per , , & of IS: with latest amendments are to be carried out at the manufacturer s premises. For each of the Post Insulators / Insulator sets Bolts, Nuts, Set Screws & Washers shall be supplied as follows : i. Requisite numbers of set Screws & Spring Washers for assembling the Post Insulator unit. ii. Requisite numbers of set screws & spring washers for fixing bus-bar Support to the cap in the top Post Insulator. iii. One set of Bolts, Nuts & Washers or Lock nuts & plain washers for mounting the Insulators on the support steel structures of bus support. iv. 5% spare Nuts & Bolts with washers shall have to be supplied of no extra cost by the purchaser with each consignment. 4. Creepage Distances : The minimum creepage distance shall 30 mm/kv. 5. Tests: Suitable number of individual units shall be subject to the following tests in accordance with IS:731/1971 with its latest amendments 6. Test Certificate : The Bidder shall furnish detailed type test reports of the offered post Insulators at the NABL approved laboratories to prove that the Disc Insulators offered meet the requirements of the specification. These Type Tests should have been carried out within five years prior to the date of opening of this tender. iii) Their offered Insulators are already fully type tested at approved Laboratory within five years prior to the date of opening of this tender. iv) There is no change in the design of type tested Insulators and those offers against this tender.

12 7. Testing Facilities : The Bidder must clearly indicate what testing facilities are available in the works of the manufacturer and whether facilities are adequate to carry out all Routine & acceptance Tests. These facilities should be available to Purchaser s Engineers if deputed or carry out or witness the tests in the manufacturer works. If any test cannot be carried out at the manufacturer's work, the reasons should be clearly stated in the tender. The insulators shall be tested in accordance with the procedure detailed in IS-731/1971 amended up to date. 8.Drawings : The tender shall be accompanied with the detailed drawings showing the dimensions of the individual insulator, giving all the design dimensions of various component parts. Generally it shall be as per IS. 9. Markings : Each insulator shall be legibly and indelibly marked to show the following: a) Name or trade mark of the manufacturer. b) Voltage Type c) Month and year of manufacturing. d) Country of Manufacturer e) ISI certificate mark 10. Packing : All insulators shall be packed in crates or boxes suitable for rough handling. Packing shall be marked with the strength and KV rating. GUARANTEED TECHNICAL PARTICULARS FOR 11 KV POST INSULATOR Slno. Description Specified Bidder s Offer 1 Name of Manufacturer. & To be specified by the bidder Address 2 Location of type testing To be specified by the bidder 3 Applicable standard IS-731/1971 with latest amendment 4 Nominal System Voltage 11 KV 5 Highest System voltage 12 KV 6 Visible discharge Test voltage 9 KV (Minimum) 7 Impulse withstand voltage 90 KVp (+ve) and 105 KVp(-ve) +(1.2/50 microsecond wave) 8 Impulse flashover 95 KVp (+ve) and 120 KVp (-ve) voltage+(1.2/50 microsecond wave) 9 1min. power frequency flashover 70 KV Voltage kv. (Dry) 10 1min. power frequency flashover 45 KV

13 Voltage kv.(wet) 11 Cantilever strength a. Upright 65 Kg(Min) b. Inverted 400 Kg(Min) 12 Tensile strength 2050 Kg 13 Torsion strength 34 m-kg 14 Compression strength 3600 Kg 15 Conforming standard As per IS 16 Drawing & Sample To be submitted by Bidder NB- Every insulator should bear the marking of manufacturer s name and ISI mark TECHNICAL SPECIFICATIONS OF 33 KV POST TYPE INSULATOR 1.Scope of Work: This Specification covers design, engineering, manufacture, assembly, stage testing, inspection & testing before supply and delivery at site of the 33 KV post type insulator 2.0 INSULATORS 2.1 General Requirements The Porcelain shall be sound, free from defects, thoroughly vitrified and smoothly glazed Unless otherwise specified, the glaze shall be brown in colour. The glaze shall cover all the porcelain parts of the insulator except those areas which serve as supports during firing or are left unglazed for the purpose of assembly The design of the insulator shall be such that stresses due to expansion and contraction in any part of the insulator shall not lead to deterioration. The porcelain shall not engage directly with hard metal Cement used in the construction of the insulator shall not cause fracture by expansion or loosening by contraction and proper care shall be taken to locate the individual parts correctly during cementing. The cement shall not give rise to chemical reaction with metal fittings, and its thickness shall be as uniform as possible. 3.0 Tests: The insulators shall comply with the following tests as per IS: & IS: 5350(PT III) Type tests a) Visual examination b) Verification of dimensions c) Visible discharge test d) Impulse voltage withstand test. e) Wet power-frequency voltage withstand test. f) Temperature cycle test. g) Electro-mechanical failing load test. h) Mechanical failing load test (for those of type B strin insulator units to which electro mechanical failing load test (g) is not applicable. i) Twenty four hours mechanical strength test (for string insulators only when specified by the purchaser).

14 j) Puncture test k) Porosity test and l) Galvanising test. 3.2 Acceptance Tests The test samples after having withstood the routine tests shall be subjected to the following acceptance test in the rder indicated below: a) Verification of dimensions. b) Temperature cycle test. c) Twenty four hours mechanical strength test(for string insulator units only when specified by the purchaser) d) Electro-Mechanical failing load test. e) Puncture test f) Porosity test and g) Galvanising test. 3.3 Routine Test a) Visual examination. b) Mechanical routine test(for string insulator units only) and c) Electrical routine test(for string insulator units only) 3.4 Marking Each Insulator shall be legibly and indelibly marked to show the following. a) Name and trade mark of the manufacturer. b) Month and year of manufacture c) Minimum failing load in Newtons d) Country of the manufacturer and e) ISI Certification mark, if any. f) Specific Parameters & Layout Conditions Marking on porcelain shall be printed and shall be applied before firing. 3.5 Packing All insulators (without fittings) shall be packed in wooden crates suitable for easy but rough handling and acceptable for rail transport. Where more than one insulator are packed in a crate, wooden separators shall be fixed between the insulators to keep individual insulators in position without movement within the crate.

15 GUARANTEED TECHNICAL PARTICULARS FOR 33 KV POST INSULATOR Slno. Description Unit Specified Bidder s UNIT STACK Offer Manufacture Name Address of Manufacture Reference Standard (s) of Insulator To be Submitted by Bidder To be Submitted by Bidder IS: & IS:5350(PT-III)-1971 Height mm Insulating Part Diameter mm Pitch Circle Diameter a) Top Metal Fitting mm b) Bottom Metal Fitting mm Minimum creepage Distance 8 Cantilever Strength mm a) Upright Kgf b) Inverted Kgf Tensile Strength Kgf Torsional Strength Kgfm Compression Strength Kgf Nominal System Voltage KV(rms) a) b) Highest System Voltage Power frequency withstand voltage (Dry) Power frequency withstand voltage (Wet) Impulse-withstand test voltage(1.2x50 microsecond wave) Positive Negative KV(rms) KV(rms) KV(rms) KVP KVP Caps Padestal Material of Cap Aluminium Alloy Cap 17 Drawing & Sample To be submitted by bidder

16 11 KV Disc insulator 45 KN (T&CType) TECHNICAL SPECIFICATION FOR 11 KV 45 KN DISC INSULATORS 1. SCOPE : This specification covers the manufacture, testing and works supply and delivery of 11 KV Disc insulators. The Porcelain insulators shall conform to IS: ammended upto date. Insulators shall be of Tongue & Clevis type (T&C).Disc insulators made of glazed porcelain shall be used as insulators on dead ends or on suspension type lines of 11 KV and above. Tongue & Clevis type (T & C) disc insulators of mechanical strength not less than 45KN shall be used confirming to IS: 731/1971. These shall be mounted on metallic cross-arms with the help of suitable non-magnetic galvanised iron hardware fittings. Small fittings like spring washers, nuts etc may be electro-galvanised. 2. SERVICE CONDITIONS : The insulators to be supplied against this specification shall be suitable for satisfactory continuous operation under the following tropical conditions Maximum ambient temperature (Degree C) Minimum ambient temperature (Degree C) Relative Humidity (%) 10 to Maximum Annual Rainfall (mm) Maximum Wind pressure (kg/m.sq.) Maximum wind velocity (km/hour) Maximum altitude above mean sea level (meter) Isoceraunic level (days/year) Seismic level (Horizontal acceleration) 0.3 g Moderately hot and humid tropical climate conductive to rust and fungus growth 3. System Particulars : a) Nominal System Voltage 11 KV b) Corresponding highest system Voltage 12 KV c) Frequency 50 Hz with 3% tolerance d) Number of phase 3 e) Neutral earthing effectively grounded. f) Min. Impulse withstand voltage 75 KV 4. Standards : Unless otherwise specified elsewhere in the specifications insulators shall confirm to the latest revisions of all relevant standards. 5. General Requirements

17 i) The Porcelain insulators shall generally conform to IS: and any amendments up to date to the same. ii) Conductors : iii) The Disc Insulators will be used on lines on which the conductors will be A.A.A. Conductor of size up to 100 sq. mm. The insulators should withstand the conductor tension, the reversible wind load as well as the high frequency vibrations due to wind. Type a) Insulator shall be suitable for both the suspension and strain type of load & shall be of Tongue and Clevis type. The insulators shall conform to Type B of IS: b) Diameter of porcelain disc insulator shall be 255mm. The center to center distance between Tongue and Clevis shall be 145mm. c) Insulator Ends. Disc Insulators shall have Tongue and Cleave ends. The security clips will have to be provided as per fig. 25 of I.S (Part-2) 1989 ( amended up to date) REC Specification 3/1971(Revised 1993). d) The colour of the units shall be brown for 45 KN Disc Insulators. e) The number of units to be used both on suspension and tension strings shall be as given below : Voltage Class Suspension Strings Tension Strings. Single Double Single Double x2 3 3x x2 2 2x x2 1 1x2 iv). Electromechanical & Mechanical Strength : The mechanical and electromechanical strength of the individual and the complete Disc shall be 45 KN. v) Creepage Distances : The minimum creepage distance for each 11KV disc Insulator shall 320mm. 6.0 Tests : Suitable number of individual units and complete string shall be subject to the following tests in accordance with IS:731/1971 with its latest amendments. i) Type Tests : Following Type test shall be carried out on porcelain insulators as specified in IS: 731 /971 amended up to date. 1. Visual Examination. 2. Verification of dimensions. 3. Visible Discharge Test.

18 4. Impulse voltage withstand test. 5. Impulse voltage flashover test. 6. Wet one Minute Power Frequency withstand test and West Flashover test. 7. Temperature Cycle test. 8. Electromechanical failing load test. 9. Power frequency puncture withstand test. 10. Porosity test. 11. Galvanizing test. ii) Acceptance Tests : The test samples after having withstood the routine test shall be subject to the following acceptance tests in order indicated below: 1. Verification of dimensions. 2. Temperature Cycle test. 3. Twenty four hour mechanical test. 4. Electromechanical failing load test. 5. Power Frequency puncture withstand test. 6. Porosity test. 7. Galvanizing test. iii) Routine Tests: 1.Visual Examination 2. Mechanical test 3. Electrical test 4. Twenty four hours mechanical test 5. Electro mechanical failing load test 7 Test Certificate : The tenderer shall furnish detailed type test reports of the offered Disc Insulators as per clause 6.1 of the Technical Specifications at the NABL approved laboratories to prove that the Disc Insulators offered meet the requirements of the specification. These Type Tests should have been carried out within five years prior to the date of opening of this tender. i) Their offered Disc Insulators are already fully type tested at approved Laboratory CPRI/NABL within five years prior to the date of opening of this tender. ii) There is no change in the design of type tested Disc Insulators and those offers against this tender. iii) Such tenderers complying (i) and (ii) above shall furnish an undertaking in the format schedule. The purchaser reserves right to demand repetition of some or all the Type Test in presence of purchaser s representative at purchaser s cost. For this purpose, the tenderer shall quote unit rates for carrying out each Type Test. However, such unit rates will not be considered for evaluation of the offer. In case the unit fails in the Type Tests, the complete supply shall be rejected. 8. Testing Facilities : The tenderer must clearly indicate what testing facilities are available in the works of the manufacturer and whether facilities are adequate to carry out all Routine & acceptance Tests. These facilities should be available to Board's Engineers if deputed or carry out or witness the tests in the manufacturer works. If any test cannot be carried out at the manufacturer's work, the reasons should be clearly stated in the tender. The insulators shall be tested in accordance with the procedure detailed in IS-731/1971 amended up to date.

19 9. Material Quality and Workmanship : The quality of porcelain and hardware in case of porcelain insulators and core & housing in case of polymeric insulators shall be of the highest grade and best workmanship such as is suitable and customary for extra high tension lines and shall conform to current IS or IEC (only in absence of the relevant I.S.S.). The porcelain shall be sound, free from defect, thoroughly vitrified and smoothly glazed and brown in colour. Unless otherwise specified the glaze shall cover all exposed porcelain parts of the insulator. Glazing shall be uniform and free from defects. Small and isolated defects in the insulator glaze of a total surface less than 0.5 sq.cm. will however be ignored. Deviation on this account may be supported by relevant IS. 10 Mechanical Design : The design shall be such that stresses due to expansion and contraction in any part of insulator shall not lead to deterioration. Cement used in manufacture of the insulators shall not cause fracture due to expansion or loosening due to contraction. 11. Drawings : The tender shall be accompanied with the detailed drawings showing the dimensions of the individual Disc giving all the design dimensions of various component parts. The drawing for Insulators should clearly show the method of cementing the porcelain to the metal caps and balls. Generally it shall be as per IS. 12. Markings: 12.1 Each insulator shall be legibly and indelibly marked to show the following : a) Name or trade mark of the manufacturer. b) Voltage Type c) Month and year of manufacturing. d) Electromechanical strength in KN e) Property of NESCO The W clip shall be marked with/punched with the ball and socket sizes for which it is meant e.g.16b,20 etc Marking on porcelain shall be printed and shall be applied before firing. 13 Packing : All insulators shall be packed in crates or boxes suitable for rough handling. Packing shall be marked with the strength and KV rating.

20 GUARANTEED TECHNICAL PARTICULARS FOR 45 KN DISC. INSULATOR ( T&C TYPE) Sl. No Particulars Specific Requirement Bidders offer 1. Name of Manufacturer. & Address To be specified by the bidder 2. Location of type testing To be specified by the bidder 3 Applicable standard IS-731/1971 with latest amendment 4 Type of insulator T&C type Disc insulator 5 Nominal System Voltage 11 KV 6 Highest System voltage 12 KV 7 Visible discharge Test voltage (Minimum) 9 KV 8 Dry Impulse withstand voltage +(1.2/50 microsecond wave) 75 KV 9 Dry Impulse flashover voltage+(1.2/50 microsecond wave) 90 KV 10. Dry 1 min. power frequency withstand Voltage kv. 60 KV 11 Wet 1 min. power frequency withstand Voltage. 35 KV 12 1 min. power frequency flashover Voltage kv. (Dry) 65 KV min. power frequency flashover Voltage kv.(wet) 45KV 14 Power frequency puncture voltage 105 KV 15 Mechanical Routine test load 18 KN 16 Mechanical impact strength 45 KN 17 Shattered strengths (Glass).. KV 18 Electromechanical Failing Load 45 KN 19 Safe working load 18 KN 20 Minimum Failing Load 45 KN 21 Creepage Distance 320 mm 22 Type and Grade of Materials : i) Insulators Porcelain ii) Cap iii) Pin iv) Locking Malleable Casting or S.G Forged pin Split pin v) Cement Portland 23 Type of semi conducting Glaze Ceramic 24 Colour of Insulators Dark Brown 25 Weight of single disc. kg. 4 Kg(Approx.) 26 Number of Insulators per crate 4 nos./ 6 nos. 27 Cross weight of Loaded crate Kg 28 Whether drawing showing dimensional details have been furnished along with bid. To be enclosed by bidder NB : Every insulator should bear the marking of Purchaser s name/ Manufacturer s name and ISI mark.

21 11KV (LIGHTNING ARRESTERS) TECHNICAL SPECIFICATION FOR 9 KV 10 KA DISTRIBUTION CLASS HEAVY DUTY SURGE ARRESTERS (LIGHTNING ARRESTERS) 1.0 SCOPE: 1.1 This specification provides for the design, engineering, manufacture, assembly, stage testing, inspection and testing before despatch, packing, forwarding and delivery of Metal Oxide (gapless) Surge Arresters complete with accessories 11 KV system as specified hereunder. 1.2 It is not the intent to specify completely herein all the details of design and construction of Surge Arresters, However, Surge Arresters shall conform in all respects to the high standard of design and workmanship and be capable of performing in continuous commercial operation up to Bidder's guarantee in a manner acceptable to Purchaser, who will interpret the meanings of drawings and specifications and shall have the power to reject any work or material which in his judgment are not in accordance therewith. The Arresters offered shall be complete with all parts, necessary for their effective and trouble free operation. Such components shall be deemed to be within the scope of supply, irrespective of whether they are specifically brought out in the commercial order or not. 2.0 STANDARDS: 2.1 The Surge Arresters shall conform to the latest editions and amendments available at the time of supply, of the standards listed hereunder: Note: S. Standard Title No. Ref No. 1. IEC 99-4 Specification Part. 4 for Surge Arresters without gap for AC system. 2 IS:3070 (Part-III) Specification for Lightning Arresters for alternating current System 3 IS:2629 Recommended practice for hot dip galvanising of iron and steel. 4 IS:2633 Method for testing uniformity of coating on Zinc coated articles. 5 IS:5621 Specification for large hollow porcelain for use in electrical installation. 6 IS:2147 Degree of protection provided by enclosures for low voltage switchgear and control gear. 7. Indian Electricity Rules i) For the purpose of this specification all technical terms used hereinafter shall have the meaning as per IEC specification. ii) For the parameters of the Arrester which are not specified in IEC specification for Surge Arresters, the provisions of ISS 3070 (Part.III) shall be applicable.

22 2.2 Surge Arresters meeting with the requirements of other authoritative standards, which ensure equal or better quality than the standards mentioned above shall also be acceptable. Where the equipment offered by the Bidder conforms to other standards, salient points of difference between the standards adopted and the specified standards shall be clearly brought out in the offer. Four (4) copies of the reference standards in English language shall be furnished along with the offer CLIMATIC CONDITIONS: 3.1 The Surge Arresters and accessories shall be suitable for continuous satisfactory operation under climatic conditions listed below. 1. Maximum ambient Air 50 C Temperature in shade (deg.c). 2. Minimum Ambient Air (-) 5 C Temperature in shade(deg.c). 3. Maximum daily average ambient air temperature 40 C 4. Maximum relative humidity(%) 100% 5. Height above mean sea level 1000M 6. Maximum wind pressure 260 Kg m² 7. Average No. of thunder Storm 70 days. Days / annum. 8. Average annual rainfall (mm) 1500 mm 9. Average No. of months of 4 tropical monsoon condition p.a. All the electrical devices shall be given tropical and fungicidal treatment to enable their satisfactory operation in the above climatic conditions. 4.0 PRINCIPAL PARAMETERS: The Surge Arresters offered under this specification shall conform to the parameters given below. S. No Particulars System parameters for 9 KV Distribution type 1 Nominal system voltage (kv rms) 11 2 Highest system voltage (kv rms) /50 microsecond impulse voltage with stand level a Transformer and reactors (kvp) 75 b Other equipment and lines (kvp) 75 4 Minimum prospective symmetrical fault 10 current for 1 second at Arrester location (KA rms) 5 Anticipated levels of temporary over voltage and its duration.

23 a Voltage(p.u.) 1.5 b Duration(Seconds) 1/10 6 System frequency(hz) 50 + / Neutral Grounding Effectively earthed 8 Number of Phases Three Note 1. 1 p.u. = 12 x 2KV peak / GENERAL TECHNICAL REQUIREMENTS: 5.1 The Surge Arresters shall conform to the technical requirements as per Annexure-A. 5.2 The energy handling capability of each rating of Arrester offered, supported by calculations, shall be furnished in the offer The Station Type Surge Arresters shall be fitted with pressure relief devices and arc diverting ports and shall be tested as per the requirements of IEC specification for minimum prospective symmetrical fault current as specified in Annexure-A The grading ring on each complete Arrester for proper stress distribution shall be provided if required for attaining all the relevant technical parameters. 5.4 PROTECTIVE LEVELS: The basic insulation levels and switching impulse withstand levels of the lines and equipment to be protected have been specified in clause 4.0, "Principal Parameters". The protective characteristics of the Arresters offered shall be clearly specified in the schedule of guaranteed technical particulars. 5.6 GENERAL REQUIREMENTS: The materials and components not specifically stated in this specification but which are necessary for satisfactory operation of the equipment are deemed to be included in the scope of supply unless specifically excluded Unless otherwise brought out separately by the Bidder in the schedule of deviations the Surge Arresters offered shall conform to the specification scrupulously. All deviations from the specification shall be brought out in the schedule of deviations. The discrepancies between the specification and the catalogues or literature submitted as part of the offer shall not be considered as valid deviations unless specifically brought out in the schedule of deviations Any deviation which has not been specifically brought out in the schedule of deviations of the Bid Proposal Sheets, shall not be given effect to. The deviations brought out in the schedule shall be supported by authentic documents, standards and other references Each individual unit of Surge Arresters shall be hermetically sealed and fully protected against ingress of moisture. The hermetic seal shall be effective for the entire life time of the Arrester and under the service conditions as specified. The Bidder shall furnish sectional view of the Arrester, showing details of sealing employed The bidder shall furnish in the offer, a sectional view of pressure relief device employed in the Station type Surge Arresters offered The Surge Arresters shall be suitable for hot line washing.

24 5.7 Construction: All the units of Arresters of same rating shall be interchangeable without adversely affecting the performance The Surge Arresters shall be outdoor and suitable for pedestal/ clamp type mounting All the necessary flanges, bolts, nuts, clamps etc., required for assembly of complete Arrester with accessories and mounting on support structure to be supplied by the Purchaser shall be included in Bidder's scope of supply The drilling details for mounting the Arrester on Purchaser's support shall be supplied by the Supplier The minimum permissible separation between the Surge Arrester and any earthed object shall be indicated by the Bidder in his offer PORCELAIN / POLYMERIC HOUSING: The housing may be of Porcelain or Polymeric Where the bidders are quoting for Surge Arresters with Porcelain Housing, all porcelain housings shall be free from lamination cavities or other flaws affecting the maximum level of mechanical and electrical strengths The porcelain shall be well vitrified and nonporous The creepage distance of the Arrester housing shall be as per Annexure-A The porcelain petticoat shall be preferably of self cleaning type (Aerofoil design). The details of the porcelain housing such as height, angle of inclination, shape of petticoats, gap between the petticoats, diameter (ID and OD) etc., shall be indicated by the Bidder in his offer in the form of a detailed drawing The Arrester housing shall conform to the requirements of IEC specification GALVANISATION, NICKEL PLATING ETC.: All ferrous parts exposed to atmosphere shall be hot dip galvanised as per IS:2629 as amended from time to time. Tinned copper / brass lugs shall be used for internal wiring. Screws used for electrical connections shall be either made of brass or nickel plated Ground terminal pads and name plate brackets shall be hot dip galvanised The material shall be galvanised only after completing all shop operations ACCESSORIES AND FITTINGS: All necessary accessories and earthing connection leads shall be in the Bidder's scope of supply Terminal connector conforming to IS: 5561 shall be supplied along with the arrester The grounding terminal shall be suitable for accommodating Purchaser's grounding

25 connection to steel earth mat Name Plate: The arrester shall be provided with non-corrosive legible name plate indelibly marked with the following information: 1. Purchaser s Name : NESCO 2. Order No.: 3. Manufacturer's name, address, trade mark and identification no. of the Arrester being supplied. 4. Rated Voltage. 5. Maximum continuous operating voltage. 6. Type. 7. Rated Frequency. 8. Nominal discharge current. 9. Line discharge class. 10. Pressure relief current in ka rms. 11. B.I.L. of the equipment to be protected. 12. Year of manufacture. 13. Date of despatch. 14. Date of Expiry of Warranty TESTS: 6.1 TEST BEFORE DESPATCH: The Surge Arrester of various rating and accessories shall be subjected at maker's works before despatch, to the following tests as per relevant standards. A) ROUTINE TEST ON EACH UNIT AS PER RELEVANT STANDARDS: 1. Measurement of reference voltage. 2. Residual voltage test. 3. Satisfactory absence from partial discharges and contact noises. 4. For arrester units with sealed housing leakage check shall be made on each unit. 5. Current distribution test for multi Column arrester. 6.2 TYPE TESTS: The bidder shall furnish valid and authenticated type test reports from a Govt. approved / Govt. recognized / NABL Accredited laboratory of similar rating and design of tendered material along with detailed dimensional drawing duly signed & verified by testing agency also showing size & numbers of blocks dimensions contained in the housing along with bid as per requirement of the Tender Specification. Such type test certificates should not be older than 5 years as on the date of bid opening. For this purpose date of conducting type test will be considered. The type test certificates shall be furnished either in original or copy duly attested by notary. The bidder should furnish documentary evidence in support of the laboratory whose type test have been furnished, that the said laboratory is a Govt. / a Govt. approved / a Govt. recognized / NABL accredited laboratory / ILAC accredited (in case of foreign laboratory). The bids of only those bidders shall be considered to be meeting the type test criteria who furnishes complete type test certificate with the bid as per above provision : Following type tests shall be conducted on one unit of each rating as per relevant standard.

26 1. Insulation withstand test. 2. Residual voltage test. 3. Bending test on arrester housing assembly. 4. Long duration current impulse withstand test. 5. Operating duty test. 6. Pressure relief test (Only for station type) 7. Test of arrester disconnectors (For 9 KV Feeder Type) 8. Artificial pollution test on porcelain. 9. Partial discharge test. 10. Housed arresters. a) Temperature cycle test. b) Porosity test. 11. Galvanising test on exposed ferrous metal parts. 12. Any other type test which are not specified above but covered as per amendment/latest edition of relevant IS/IEC. 6.3 TEST ON BOUGHT OUT ITEMS: Tests are not required to be performed on bought out equipments/items like, Terminal connector etc. at the works of manufacturer. Furnishing Test Certificate of bought out items from the original equipment manufacturers shall be deemed to be satisfactory evidence. Inspection of the tests at Sub- contractors works will be arranged by the supplier whenever required. 6.4 ROUTINE/ACCEPTANCE TESTS: The following tests shall be got conducted in presence of purchaser's representative, as per stipulation of the relevant standards. Acceptance tests whenever possible shall be conducted on the complete arrester unit. No. of samples to be selected for acceptance tests shall be nearest lower whole number to the cube root of the number of arresters to be supplied. 1. Measurement of power frequency reference voltage on the complete arrester at the reference current measured at the bottom of the arrester. 2. Lightning Impulse residual voltage. 3. Partial discharge test. 4. Visual inspection & verification of dimension. 5. Special thermal stability test. 6. Galvanising test on Ferrous metal parts. 7. Any other tests as per IS. 6.5 TOLERANCE ON TEST RESULTS: As per relevant standards/specifications CHECKING AT STORES (TEST AT CTL): One out of every 50 nos. Surge Arresters will be selected for checking at Store for visual, dimensional, weight, marking etc. as per relevant ISS/GTP/approved drawing. 7.0 INSPECTION: All the tests (as mentioned at Clause 6.4) and Inspection shall be made at the place of manufacturer unless otherwise especially agreed upon by the bidder and purchaser at the time of purchase. The bidder shall afford the inspection officer(s) representing the purchaser all reasonable facilities without charges, to satisfy him that the material is being supplied in accordance with this specification. The purchaser has the right to have the tests carried out at his own cost by an independent agency whenever there is a dispute regarding the quality of supply.

27 The Inspection may be carried out by the purchaser at any stage of manufacture/before despatch as per relevant standard. Inspection and acceptance of any material under the specification by the purchaser, shall not relieve the bidder of his obligation of furnishing material in accordance with the specification and shall not prevent subsequent rejection if the material is found to be defective. The Bidder shall keep the purchaser informed in advance, about manufacturing programe so that arrangements can be made for inspection. The purchaser reserves the right to insist for witnessing the acceptance/routine testing of the bought out items. GUARANTEED TECHNICAL PARTICULARS FOR SURGE ARRESTERS METAL OXIDE (GAPLESS) S. No. Particulars Requirement of parameters 1 Name of Manufacturer. & Address To be specified by 2 Location of type testing the To be bidder specified by 3 Applicable standard IS:3070 (Part-III) or the latest version thereof 4 Rated arrester voltage (KV) 9 Bidder s offer 5 Maximum continuous operating 10 voltage (MCOV) KV (rms) 6 Installation Outdoor 7 Class Distribution Class 8 Type of construction Single column, single phase 9 Nominal discharge current corresponding to 8 / 20 micro second wave shape (KA peak) Type of mounting Pedestal 11 Connection (between phase to earth) / Phase to Earth (between phase to phase) 12 Line discharge class 2 13 Ratio of switching impulse residual voltage to rated voltage of arrester As per provision of IEC 99 4 (latest amended) 14 Minimum prospective symmetrical fault current for pressure relief test (KA rms) Terminal connector suitable for the upto 100 mm² single a) conductor b) Take off For both vertical & horizontal 16 Voltage (corona extinction) (KV rms) Rated voltage of arrester

28 17 Partial discharge As per provision of IEC 99 4 (latest amended) 18 Whether insulating base and No discharge counter with milli ammeter are required 19 Minimum creepage distance of arrester 300 mm housing 20 Drawing To be submitted by bidder Name & Signature of Bidder with seal SCOPE TECHNICAL SPECIFICATION OF 33KV LIGHTNING ARRESTOR 14.1 This Specification provides for the design, manufacture, inspection and testing before dispatch, packing and delivery F.O.R. (destination) of metal oxide (gapless) Surge Arresters with discharge counters, insulating base, terminal connectors and other accessories as specified here in. Following is the list of documents constituting this Specification. : (i) Technical Specification (TS) (ii) Check-List. Annexure-B (iii) Calibration Status of testing equipments and meters/ Instruments. Annexure-C (iv) Check-list towards Type Test Reports. Annexure-D Note : Annexure-B,C,& D are to be filled up by the Bidder. All the above along with amendments thereof shall be read and interpreted together. However, in case of a contradiction between the Technical Specification and any other volume, the provisions of this volume will prevail The Surge Arrester shall conform in all respects to high standards of engineering, design, workmanship and latest revisions of relevant standards at the time of offer and purchaser shall have the power to reject any work or materials, which in his judgment is not in full accordance therewith STANDARDS:- Except to the extent modified in the Specification, the Surge Arrester shall conform to the latest editions and amendments of the standards listed hereunder. Sl. No. Standard Title. 1 IEC-99-4 Ref. No. Specification for Surge Arresters without gap for AC System. 2 IS:2147 Degree of protection, provided by enclosures for low voltage switchgear and control. 3 IS:2629 Recommended practice for hot dip galvanization of iron and steel. 4 IS:2633 Method for testing uniformity of coating on zinc coated articles.

29 5 IS:3070 Specification for surge arresters for alternating current 6 IS:5621 system. Specification for large hollow porcelain for use in electrical & IEC installation. 7 IEC-60-1 High-Voltage Test technique. 8 IEC-270 Partial discharge measurements. 9 IEC-99-1 Non-linear resistor type gapped arresters for a.c. systems. 10 Indian Electricity Rules, IEC Shed profile of hollow porcelain Insulator Surge Arresters with the requirement of other authoritative standards, which ensure equal or better quality than the standards, mentioned above shall also be acceptable. Where the equipment offered by the supplier conforms to other standards, salient points of difference between the standards adopted and the specified standards shall be clearly brought out in the offer. 4 (Four) copies of the reference standards in English language shall be furnished along with the offer GENERAL TECHNICAL REQUIREMENTS: The Surge Arrester shall confirm the technical requirements The energy handling capability of each rating of Arrester offered, supported by calculations, shall be furnished with the offer The Surge Arresters shall be fitted with pressure relief devices and arc diverting paths and shall be tested as per the requirements of IEC for minimum prospective symmetrical fault current as specified in Appendix-I A grading ring shall be provided if required, (for attaining all the relevant technical parameters) on each complete Surge Arrester PROTECTIVE LEVELS: Surge Arresters shall be capable of providing protection to sub-station equipments, designed for the withstand levels, given in the following table. Sl. Equipment to be protected Insulation Level of 36KV System No. L.I. Level (KVP) 1 Power Transformers Instrument Transformers Reactors Circuit Breakers/Isolators. (i) Phase to ground. 170 Surge arrester shall be suitable for the following duty cycles of circuit breaker at the following system voltages: 14.7 DUTY REQUIREMENT: 36 KV Circuit Breaker sec-co-3 min-co Surge Arresters shall be of heavy-duty station class and gapless type without any series or shunt gaps. i. Surge Arresters shall be capable of discharging over voltages occurring during switching of unloaded transformers, lines, capacitors and reactors.