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
Not less
than 570
ohms
Not less
than 570
ohms
508
320
156
105
1 of 6
Bharat Heavy Electricals Ltd.
Doc. No. TB-STD-510-011, Rev 00
Technical Specification
LINE TRAP
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
2 of 6
Bharat Heavy Electricals Ltd.
Doc. No. TB-STD-510-011, Rev 00
Technical Specification
LINE TRAP
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
Bharat Heavy Electricals Ltd.
Doc. No. TB-STD-510-011, Rev 00
Technical Specification
LINE TRAP
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
Bharat Heavy Electricals Ltd.
Doc. No. TB-STD-510-011, Rev 00
Technical Specification
LINE TRAP
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
Bharat Heavy Electricals Ltd.
Doc. No. TB-STD-510-011, Rev 00
Technical Specification
LINE TRAP
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.
6 of 6
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)
Not less
than 570
ohm (for
220 kV)
Not less
than 570
ohm (for
132 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