Wave Trap

BHARAT HEAVY ELECTRICALS LIMITED TRANSMISSION BUSINESS ENGINEERING MANAGEMENT DOCUMENT No.

TB-STD-510-011

TYPE OF DOC.

TECHNICAL DOCUMENT

NEW DELHI Rev 00 NAME

TITLE

Prepared

Checked

Approved

BA

SKS

RS

31.12.09

31.12.09

31.12.09

TBEM

TBEM

TBEM

SIGN DATE

LINE TRAP

GROUP

STANDARD SPECIFICATION

Contents:

COPYRIGHT & CONFIDENTIAL The information in this document is the property of BHARAT HEAVY ELECTRICALS LIMITED This must not be used directly or indirectly in anyway detrimental to the interest of the company.

S. No.

Description

Total Sheets

1. Cover Sheet

1

2. Scope, Specific Technical Requirements & BOQ

6

3. Check List

5

4. Manufacturing Quality Plan

1

Date Distribution

Altered

Checked

Approved To Copies

Bharat Heavy Electricals Ltd. Doc. No. TB-STD-510-011, Rev 00 Technical Specification LINE TRAP

1.0

SCOPE This specification covers the requirement of design, manufacture, assembly, testing, packing & despatch of Line Traps along with Tuning Units as listed below. No deviation from the requirements specified in various clauses of this specification shall be allowed.

1.1 SPECIFIC TECHNICAL REQUIREMENTS S. No.

Technical Parameters

Unit

Value for 765 kV

400 kV

220 kV

132/kV

1

Max operating voltage of the kV system rms

765

420

245

145

2

Rated short time current for kA 1-second

40

40/50/63

40 /31.5

31.5 / 25

3

Nominal discharge current of kA protective device

4

Type of tuning

5

Rated Blocking bandwidth

6

Capacitance of CVT

7

Max Radio Interference Voltage μV level

8

Rated power frequency

9

Resistive component of ohms impedance within Carrier frequency blocking range

10

Min Corona extinction voltage kV level rms

10/20

Broad Band Typically in the range 30-500 kHz

pF

4400/6600/8800/13200 1000 (for 508 kV rms)

500 (for 280 kV rms )

Hz

500 (for 163 kVrms )

500 (for 97 kVrms)

50 Not less than 450 ohms

Not less than 450 ohms



508

320

156

105

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Line Traps are required with following accessories (a) Hardware (Nuts, Bolts and Washers) for mounting Line Trap

– 1 set with Each Line Trap

(b) Terminals Connectors

– 1 set with Each Line Trap

Following Type of Line Traps are proposed Table (A) : Line Trap Type 765-LT1 765-LT2 400-LT1 400-LT2 400-LT3 400-LT4 220-LT1 220-LT2 220-LT3 220-LT4 220-LT5 220-LT6 220-LT7 220-LT8 220-LT9 220-LT10 220-LT11 220-LT12 220-LT13 220-LT14 220-LT15 220-LT16 220-LT17 132-LT1 132-LT2 132-LT3 132-LT4 132-LT5 132-LT6 132-LT7 132-LT8 132-LT9 132-LT10

kV rms 765kV 765kV 400kV 400kV 400kV 400kV 220kV 220kV 220kV 220kV 220kV 220kV 220kV 220kV 220kV 220kV 220kV 220kV 220kV 220kV 220kV 220kV 220kV 132kV 132kV 132kV 132kV 132kV 132kV 132kV 132kV 132kV 132kV

kA 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 31.5 31.5 31.5 31.5 31.5 31.5 31.5 31.5 31.5 31.5 31.5 31.5 31.5 31.5 31.5 31.5 31.5 31.5

mH 1.0 0.5 1.0 0.5 1.0 0.5 1.0 0.5 1.0 0.5 1.0 0.5 1.0 0.5 0.5 1.0 0.5 1.0 0.5 1.0 0.5 1.0 0.5 1.0 0.5 1.0 0.5 1.0 0.5 1.0 0.5 1.0 0.5

A 3150 3150 3150 3150 2000 2000 2000 2000 1600 1600 1600 1600 1250 1250 1250 2000 2000 1600 1600 1600 1600 1250 1250 1250 1250 800 800 630 630 800 800 630 630

Mounting Pedestal Pedestal Pedestal Pedestal Pedestal Pedestal Pedestal Pedestal Pedestal Pedestal Suspension Suspension Suspension Suspension CVT mounted type Pedestal Pedestal Pedestal Pedestal Suspension Suspension Suspension Suspension Suspension Suspension Suspension Suspension Suspension Suspension CVT mounted type CVT mounted type CVT mounted type CVT mounted type

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Table (B): Terminal Connector Type 765-TC1 765-TC2 400-TC1 400-TC2 400-TC3 220-TC1 220-TC2 220-TC3 220-TC4 220-TC5 132-TC1 132-TC2 132-TC3

kV rms 765 kV 765 kV 400 kV 400 kV 400 kV 220 kV 220 kV 220 kV 220 kV 220 kV 132 kV 132 kV 132 kV

4 " Al. Tube Quad. Moose 4 " Al. Tube Quad. Moose Twin Moose 4 " Al. Tube Twin Moose Twin Zebra Single Moose Single Zebra 4 " Al. Tube Single Moose Single Zebra

1.2 LIST OF DOCUMENTS TO BE SUBMITTED at CONTRACT STAGE 1. 2. 3. 4.

OGA Drawings GTP Type Test Reports QA Plan

1.3 APPLICABLE STANDARDS The Line Traps shall comply with applicable parts of the following standards, except as otherwise specified herein: IEC : 60099(Part –1and 4) Surge arrester IEC: 60353 Line Trap. IS 8792 Line Traps. IS 8793 Method of Tests for Line Trap. IEC : 60 High Voltage Test Techniques. IS 3070 (Part I) Specification for Surge Arresters for AC System. IS 5561 Specification of electric power Connectors. The equipment shall also meet with following International publication on the subject: CIGRE 319- 1962 CIGRE 35-01-1974 IEEE (USA) Vol.83 No.7 PAS The equipment shall conform to the latest applicable standards and their amendments.

3 of 6


1.4 FEATURES 1. Line trap shall be inserted into high voltage transmission line to prevent undue loss of carrier signal for all power system conditions. Its impedance shall be negligible at power frequency (50 Hz) so as not to disturb power transmission but shall be relatively high over the frequency band appropriate to carrier transmission. 2. The Line Traps shall be broadband type tuned for its entire carrier frequency range. Resistive component of impedance within carrier frequency blocking range shall not be less than 570 ohms. 3. Line trap shall consist of a main coil designed to carry continuously the rated current without exceeding the limit of temperature rise. It shall be provided with a protective device and a tuning device. Also suitable corona rings shall be provided to meet corona and radio interference performance as detailed above (clause 1.1, serial no. 7 &10). 4. Line Trap shall be provided with a protective device in the form of surge arrester which shall be designed and arranged such that neither significant alteration in its protective function nor physical damage shall result from either temperature rise or the magnetic field of the main coil at continuous rated current or rated short time current. The protective device shall neither enter into operation nor remain in operation, following transient actuation by the power frequency voltage developed across the line trap by the rated short time current. The protective device shall be shunt connected to the drain coil and tuning device. 5. The surge arrester shall be station class current limiting active gap type. Its rated discharge current shall be 10 kA. Coordination, however, shall be done by taking 20kA at 8/20 micro sec discharge current into account. Bidder has to furnish full justification in case the gap-less metal oxide arrester is recommended at contract stage. The SA provided with line trap of each rating shall fully comply with the requirements of IS 3070 Part-I/ IEC-99-1Part-1/IEC-60099-4. The SA provided with the line trap shall be subjected to routine and acceptance tests as per IEC-60099-1 (Part-1) /IEC-60099-4. 6. The Line traps shall be equipped with suitable bird barriers and shall be painted. 7. WELDING All the welding included in the manufacture of line traps shall be performed by personnel and procedure qualified in accordance with ASME-IX and all the critical welds shall be subjected to NDT as applicable. 8. MOUNTING The Line traps shall be suitable for outdoor pedestal or suspension mounting and shall be mechanically strong to withstand the stresses due to wind pressure of 260 kg/sq m. All the accessories and hardware including bolts for fixing the line trap on insulators shall be of non-magnetic material and shall be supplied by bidder. For pedestal mounting, it shall be mounted on a tripod structure formed by three solid core bus post insulators. 9. TERMINAL CONNECTORS 4 of 6


The Line Traps shall be suitable for connecting to 4" IPS Aluminium tube or ACSR bundle conductor with horizontal or vertical take off. Necessary connector shall be supplied by the bidder as per table -B. Terminal Connectors shall conform to IS:5561. No part of clamp or connector (including hardware) shall be magnetic material. All castings shall be free from blowholes, surface blisters, cracks and cavities. All sharp edges shall be blurred and rounded off. Clamps and connectors shall be designed corona controlled. All nuts and bolts shall be suitably shrouded. Clamps/connectors shall be designed for the same current ratings as line trap and temperature rise shall not exceed 35.deg. C over 50.deg. C ambient. No current carrying part shall be less than 10mm thick. Clamps / connectors shall conform to type test as per IS:5561. Type Test reports shall also be submitted for following additional tests at contract stage: a) Visual Corona Extinction Test b) Radio Interference Voltage Measurement.

1.5 RATING PLATE Each Line Traps shall be provided with anodized aluminium rating plate of thickness not less than 2 mm, secured permanently on the main coil, tuning device and protective device as per clause 15 of IEC: 60353. In addition to above requirements, the name of ultimate customer & BHEL shall be given on the rating plate.

1.6 TESTS The Line Traps, Connectors & Surge Arresters shall be accompanied by Type, routine and acceptance testing as per latest IS/ IEC standards. Bidders shall submit valid reports of type tests carried out within five years of bid opening at contract stage. These reports should have been conducted on identical / similar equipment to those offered, in case less than five years old type test reports OR valid type tests are not furnished, the tests shall be conducted free of charge. No separate type test charges shall be paid. All valid type test reports as per latest IS/ IEC for Line Traps shall be submitted for approval at contract stage, which shall include the following a) Short time current & peak withstand test. 5 of 6


b) Temperature rise test. c) Corona extinction voltage test d) Radio Interference Voltage test. e) Measurement of Inductance of main coil f) Insulation Test The SA provided with the WT of each rating shall fully comply with the requirement of IS: 3070 Part-1 & IEC-60099-1/IEC-60099-4. It shall conform to type tests as applicable & type test certificate for the same shall be submitted by the Bidder for approval. The SA provided with Line Trap shall be subject to routine & acceptance tests as per IEC-60099-1/IEC-60099-4. Bidder shall also submit type test charges for conducting type tests on Line Traps, Connectors & Surge Arresters in the event of these tests being conducted even after availability & approval of valid type tests reports. Such tests shall be conducted on payable basis.

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CHECK LIST FOR INFORMATION TO BE FURNISHED WITH OFFER RETURN THIS CHECKLIST AS PART OF THE OFFER DULY SIGNED The offer may not be considered if the following information and this Checklist are not enclosed with the Offer.

BHEL ENQUIRY NO: BIDDER: OFFER REFERENCE: A) S.No.

Parameters

Data

1.

Applicable Standard

IEC: 60353 with amendment, IS:8792,IS 8793, IEC: 60099 (Part I&IV), IS : 3072 (Part -I) and IS : 5561

2. 3.1

Type Rated Inductance (Indentor to tick) Rated Frequency

3.2 3.3 3.4

System Voltage (Indentor to tick) Rated current (Indentor to tick)

0.5 mH

3.6

3.7

1.0 mH

50 Hz 765kV 3150 Amp. 1250 Amp.

3.5

Yes / No

400kV

220 kV 2000 Amp. 800 Amp.

132 kV

1600 Amp. 630 Amp. 25 kA for 1Sec

Rated Short Circuit Current (Indentor to tick) Tuning device type (Indentor to tick)

40 kA for 1 sec.

31.5 kA for 1 sec.

Factory fixed

Field adjustable

Type of tuning

Broad Band

Remarks

3.8

Tuning range (Indentor to tick from from frequency planning of PLCC)

50 to 90 kHz (for 1mH)

90 to 500 kHz (for 1mH)

90 to 150 kHz (for 0.5 mH)

150 to 500 kHz (for 0.5 mH)

3.9

Minimum blocking Impedance or resistance

Not less than 450 ohm (for 400 kV)



3.10

Visual Corona Extinction voltage (Indentor to tick)

Not less than 320kV (rms) (for 400kV)

Not less than 156 kV (rms) (for 220 kV)

Not less than 105 kV (rms) (for 132 kV)

S.No.

Parameters

Not less than 450 ohm (for 765 kV) Not less than 508 kV (rms) (for 765kV) Data

3.11

Radio Interference voltage (Indentor to tick)

3.12

Material of main coil Mounting arrangement (Indentor to tick) Line Trap shall be mechanically strong enough to withstand the stresses due to maximum wind pressure 260 Kg /m2

3.13

3.14

Not Not exceed exceed 1000 μV 500 μV at at 280 kV 508kV (rms) (rms) (for 420 (for 765 kV) kV) Non magnetic Pedestal mounting 260 Kg /m2

Yes / No Not exceed 500 μV at 163 kV (rms) (for 245 kV)

Not exceed 500 μV at 97 kV (rms) (for 132 kV)

Suspension mounting

Remarks

4.1

4.2

5.1

5.2

Station class current limiting type Lightning arrestor . Rated discharge current of lighting arrestor Terminal connectors (Indentor to tick) Terminal connection (Indentor to tick)

Provided

10 /20 kA

Provided

Not provided

4 " IPS Al. tube Twin Bersimis Twin Zebra

5.3

Visual Corona Extinction voltage for clamps and connectors (Indentor to tick)

Not less than 508 kV (rms) (for 765kV) Not exceed 1000 μV at 508 kV (rms) (for 765 kV)

Not less than 320 kV (rms) (for 400 kV) Not exceed 500 μV at 280 kV (rms) (for 400 kV)

5.4

Radio Interference voltage for clamps and connectors (Indentor to tick)

5.5

Material of clamp and connector

Non magnetic

6.0

Bird barriers

Provided

3 " IPS Al. tube Quad Moose Single Moose Not less than 156 kV (rms) (for 220 kV)

Quad Bersimis Twin Moose Single Zebra Not less than 105 kV (rms) (for 132 kV) Not Not exceed exceed 500 μV 500 μV at 163 kV at 97 kV (rms) (for (rms) 245 kV) (for 132 kV)

B) TYPE TESTS i)Whether type test reports of the following test conducted earlier on identical or similar material are available(test reports are of the test conducted not earlier than 5 (five) years prior to the date of bid opening). (YES / NO) S.No.

TESTS

1 2

Temperature rise test Measurement of Radio influence test Corona Extinction voltage test Insulation Test Impulse test Power frequency voltage test on tuning device Short time current test Measurement of the rated inductance of the main coil Measurement of power frequency inductance of the main coil Measurement of blocking resistance and blocking impedance Measurement of tapping loss and tapping loss based on the blocking resistance Tests on Lighting arrester used in Line Trap Measurement of power frequency spark over voltage Standard lighting impulse spark over voltage Lighting impulse spark

3 4 (a) (b)

5 6

7

8

9

10

(a)

(b)

(c)

REPORT NO.

Date

Conducted at accredited laboratory or witnessed by independent authority

S.No.

(d)

(e)

(f) (g) (h) (i) (j) 11

(a) (b) (c) (d) (e) (g)

over voltage /time current test TESTS

REPORT NO.

Date

Conducted at accredited laboratory or witnessed by independent authority

Measurement of front of wave impulse spark over voltage Switching impulse spark over voltage / time curve test Measurement of residual voltage Current impulse withstand test Operating duty test Pressure relief test Tests of arrestor disconnectors Test on terminal connector used in Line trap Short time current test Visible corona test Radio Interference voltage test Tensile test Resistance test Temperature rise test

ii) If type test reports are not acceptable to BHEL/Customer then above tests shall be conducted by the bidder free of cost . (YES / NO)

Date:

Signature of the authorized representative of Bidder Company Seal

Bharat Heavy Electricals Ltd Doc. No. TB-STD-510-011 Rev. 00 Technical Specification Line Trap

ANNEXURE C

MANUFACTURER’S NAME & ADDRESS

BHEL SL. No.

1

MANUFACTURING QUALITY PLAN

PROJECT:

ITEM:

PACKAGE: CONTRACT NO.: CONTRACTOR: BHEL/ TBD/ NEW DELHI

QP No. __________ Rev No. __________ Date ____________ PAGE __ OF __

SUBSYSTEM:

COMPONENT AND OPERATION

CHARACTERISTIC

2

3

CLASS

4

TYPE OF CHECK

QUANTUM OF CHECK

REFERENCE DOCUMENT

ACCEPTANCE OF NORMS

5

6

7

8

FORMAT OF RECORD

9

D*

P

AGENCY W V

10

REMARKS

11

LEGEND: * RECORDS IDENTIFIED WITH ‘TICK’ SHALL BE ESSENTIALLY INCLUDED BY CONTRACTOR IN QA DOCUMENTATION.

MANUFACTURER/ SUB-CONTRACTOR

CONTRACTOR

SIGNATURES

FORMAT - QS-01-QAI-P-09/F1-R0

Indicate ‘P’ ‘PERFORM, ‘W’ WITNESS and ‘V’ VERIFICATION

REVIEWED BY

Name & Sign of Approving Authority & Seal