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TRANSMISSION MATERIALS STANDARD SPECIFICATION
12-TMSS-02, Rev. 0
TABLE OF CONTENTS
1.0
SCOPE
2.0
CROSS REFERENCES
3.0
APPLICABLE CODES AND STANDARDS
4.0
DESIGN AND CONSTRUCTION REQUIREMENTS 4.1 4.2 4.3 4.4 4.5 4.6
5.0
TESTS 5.1 5.2
6.0
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General Design Criteria Ratings Materials Fabrication Markings
Type (Design) Tests Sample Tests
DATA SCHEDULE
Date of Approval: August 5, 2006 G
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TRANSMISSION MATERIALS STANDARD SPECIFICATION
1.0
12-TMSS-02, Rev. 0
SCOPE This SEC Transmission Material Standard Specification (TMSS) specifies the minimum technical requirements for design, engineering, manufacture, inspection testing and performance of compression type connectors for overhead transmission lines intended to be used on outdoor bare overhead transmission lines in the Transmission System of Saudi Electricity Company (SEC), Saudi Arabia.
2.0
CROSS REFERENCES This Transmission Material Standard Specification shall be read in conjunction with the latest revision of SEC Transmission General Specification No. 01-TMSS-01 titled “General Requirements for all Equipments/Materials” which shall be considered as an integral part of this TMSS. This TMSS shall also be read in conjunction with SEC Transmission Purchase Order or Contract Schedules for project, as applicable.
3.0
APPLICABLE CODES AND STANDARDS The latest revision/amendments of the Codes and Standards listed hereunder shall be applicable for the equipment/material covered in this specification. In case of conflict, the vendor/manufacturer may propose equipment/materials conforming to one group of Industry Codes and Standards quoted hereunder without jeopardizing the requirements of this TMSS. 3.1
ANSI
C119.4
Electric Connectors – Connectors to use between Aluminum-to-Aluminum or Aluminum-toCopper Bare Overhead Conductors
3.2
ASTM
A153/A153M
Standard Specification for Zinc Coating (HotDip) on Iron and Steel Hardware
3.3
ASTM
B580
Standard Specification Coatings on Aluminum
3.4
BS
3288-1
Insulator and Conductor Fittings for Overhead Power Lines Part I: Performance and General Requirements
3.5
NEMA
107
Methods of Measurement of Radio Influence Voltage (RIV) of High Voltage Apparatus
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Date of Approval: August 5, 2006 G
for
Anodic
Oxide
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TRANSMISSION MATERIALS STANDARD SPECIFICATION
4.0
12-TMSS-02, Rev. 0
DESIGN AND CONSTRUCTION REQUIREMENTS 4.1
4.2
General 4.1.1
The overhead line compression connectors shall be of manufacturer's standard design and shall meet or exceed the requirements of this Specification in all respects.
4.1.2
Manufacturer's drawings, as required in 01-TMSS-01 shall show the outline of the compression connector, together with all pertinent dimensions such as length and diameter of connectors before and after compression and elongation etc. Any variations in these dimensions due to manufacturing tolerances shall be indicated.
4.1.3
Service conditions referenced in 01-TMSS-01 shall be the basis of design criteria and the compression connectors shall be designed to conform with the size and ampacity ratings of the conductors joined.
Design Criteria 4.2.1
The compression connectors shall be designed for use on the type of overhead bare conductors as specified in the Data Schedule.
4.2.2
The overhead line compression connectors shall be designed for making electrical connections between aluminum conductors, or aluminum conductors in combination with copper conductors. The types of overhead line compression connector shall be as follows: a. b. c. d. e.
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Dead-end Connectors Mid Span Splice Connectors Repair Sleeve Connectors Tee Tap Connectors Jumper connectors
4.2.3
All compression connectors shall be classified as full tension except Tee Tap and Jumper Connectors which shall be designed either as full tension or partial tension depending upon their application.
4.2.4
The temperature rise in midspan joints, compression dead ends, tension clamps, jumper terminals and similar components shall not be greater than the temperature rise in the conductor.
4.2.5
The design of dead ends shall be such as to facilitate the formation and fitting of jumper loops for the electrical or mechanical continuity of the conductor or shield wire. The design of all compression fittings (tension clamp and tension splices and compression type repair sleeves) shall be such that only one pair of dies is necessary for each size of conductor.
Date of Approval: August 5, 2006 G
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TRANSMISSION MATERIALS STANDARD SPECIFICATION
4.2.6
4.3
12-TMSS-02, Rev. 0
The conductivity of all conductor splice fittings in which the conductor is not continuous shall not be less than that of an equivalent length of conductor.
Ratings When installed as an assembly, the compression connectors shall have the following ratings: 4.3.1
Tensile Strength a.
Full Tension – Compression dead-end and mid span splice (except jumper connectors) shall be designed for full tension use, developing a minimum of ninety five percent (95%) of the rated strength of the weaker of the conductors being joined. The connectors shall not permit slipping of or cause damage to or failure of the complete line conductor or any part thereof at a load less than ninety five percent (95%) of the ultimate strength of the conductor. The repair sleeve shall restore the conductor to ninety five percent (95%) of conductor rated strength on conductors with up to one-third (1/3) of the aluminum strands damaged.
4.3.2
4.4
12TMSS02R0/SW
b.
Partial Tension - Forty percent (40%) of the rated strength of the weaker of the conductors being joined.
c.
Minimum Tension - Five percent (5%) of the rated strength of the weaker of the conductors being joined.
d.
Slipping strength of jumper terminals shall not be less that twenty five percent (25%) of conductor strength.
All compression connectors shall be corona free at a voltage of 48kV, 80kV, 92kV, 160kV and 265kV line-to-ground for 69kV, 110/115kV, 132kV, 230kV and 380kV transmission lines respectively.
Materials 4.4.1
The compression sleeve, barrel and keeper of the aluminum compression connectors shall be made from wrought aluminum.
4.4.2
The steel metal parts of the compression dead-end and mid span splice shall be made from forged steel.
4.4.3
Nuts, bolts, and washers to connect jumper terminal pad with the dead-end compression terminal pad shall be made of aluminum or stainless steel. The bolts, nuts and washers shall be of minimum 12 mm diameter.
Date of Approval: August 5, 2006 G
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TRANSMISSION MATERIALS STANDARD SPECIFICATION
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12-TMSS-02, Rev. 0
4.4.4
The steel metal parts shall be galvanized in accordance with General Specification 01-TMSS-01.
4.4.5
The aluminum metal parts shall be anodic oxide coated in accordance with ASTM B580.
4.4.6
The compression connectors for making connections between aluminum and copper conductors shall be hot-tin coated aluminum bodied connectors.
Fabrication 4.5.1
The compression dead-end and mid span splice for ACSR/AW type conductors shall be of two-piece compression type consisting of inner steel sleeve for joining steel core and an outer aluminum sleeve for connecting aluminum strands. The aluminum sleeve shall be provided with filler hole and aluminum plug for filler (oxide inhibiting or sealing) compound. Appropriate filler compound shall be supplied as part of the compression connectors.
4.5.2
The compression dead-end and mid span splice for ACAR type conductors shall be of one-piece compression type and shall be prefilled with an appropriate filler (oxide inhibiting or sealing) compound and capped.
4.5.3
The tongue or terminal pad of the compression dead-end connector shall be constructed with a 15-degree angle. Both sides of the pad shall have even electrical contact surfaces.
4.5.4
The jumper sleeve shall be one piece compression type, prefilled with an appropriate filler (oxide inhibiting or sealing) compound and capped. It shall be possible to use any jumper terminal with any dead-end terminal pad, and to connect the two-bolt pads with four bolt pads.
4.5.5
The compression type repair sleeve shall consist of interlocking body and keeper parts when compressed. This shall provide locking against relaxation of the parts, resulting in a permanent grip on the conductors.
4.5.6
The tee-tap connectors shall be of open-run type cable to flat connection.
4.5.7
For extra-high voltage application (230 kV and above), connectors shall have rounded edges and corners for suppression of corona discharges.
4.5.8
The ends of compression accessories (midspan joints, deadends and jumper terminals) shall be tapered in such a manner that the pressure shall be gradually reduced to zero on that part of the conductor
Date of Approval: August 5, 2006 G
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TRANSMISSION MATERIALS STANDARD SPECIFICATION
12-TMSS-02, Rev. 0
leaving the accessory and that the conductor stresses caused from bending and vbration are reduced to a minimum.
4.6
4.5.9
Where mating surfaces of jumper termials are to be bolted to the main body of the tension clamp, they shall be factory protected by removable plastic or other means acceptable to SEC.
4.5.10
Repair sleeves shall consist of two interlocking parts of aluminum alloy suitable for compressing over the conductor.
Markings To facilitate proper identification during installation, the following information shall be marked in legible and indelible on each compression connector. 4.6.1 4.6.2 4.6.3 4.6.4 4.6.5 4.6.6 4.6.7
5.0
Manufacturer's Name and Country of Origin Catalog Number Die Index Number Conductor Size Start Knurl Stop Knurl Knurl Locations (if applicable)
TESTS All test results shall be provided for review and acceptance by SEC. 5.1
Type (Design) Tests Following type (design) tests shall be performed on a representative unit or on the first unit of every new design or rating. The compression connectors (deadend, mid span splice, repair sleeve and Tee Tap connector) shall be assembled in accordance with the manufacturer’s recommendations on the conductors of the size and type with which these are to be used. The conductor to be used for these tests shall be arranged by the manufacturer. The test results shall be supplied to SEC: 5.1.1
Mechanical Type Test The assembly when tested in accordance with BS 3288-1 or ANSI C119.4 shall withstand a load of minimum ninety five percent (95 %) of the rated strength of the conductor. There shall be no movement of the conductor relative to the connector and no failure of the connector due to slip during one-minute hold period at ninety percent (90 %) of the conductor rated strength.
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TRANSMISSION MATERIALS STANDARD SPECIFICATION
5.1.2
12-TMSS-02, Rev. 0
Electrical Type Tests In lieu of the actual type tests, certified test reports of tests performed on an identical unit may be submitted to SEC for review and approval during the bidding stage. a.
Resistance Test The electrical resistance of the assembly when tested in accordance with BS 3288-1 or ANSI C119.4 shall not exceed seventy five percent (75 %) of the measured resistance of the equivalent length of the conductor. The test shall be made with a direct current and test shall be repeated with the polarity and the average of the two results taken as the measured value.
b.
Heat Cycle Test A tensile load of about twenty percent (20 %) of the rated strength of the conductor shall be applied to the assembly and shall be tested in accordance with BS 3288-1 or ANSI C119.4. Test current shall be passed continuously through the assembly for period as may be necessary to raise the conductor temperature 40ºC above the ambient temperature. The current shall then be interrupted and the conductor shall be allowed to cool within 5ºC above the ambient temperature. The sequence of operations shall be repeated for 250 cycles of heating and cooling. During the last five cycles the maximum temperature, measured when the current is flowing, at any point on the surface of compression connector, shall not exceed that of the conductor. At the end of the test the connector shall meet the requirements of the resistance test specified above. The connectors when opened shall not show any sign of local heating, burning or fusing of any part of the connector or of the conductor, as a result of this test.
c.
Corona (Visible Discharge) Test The connectors shall be attached to a length of conductor of the size and type with which these are to be used. The connectors when tested in accordance with NEMA 107 shall not exhibit any sign of visible corona at a power frequency voltage of a value as specified in Clause 4.3.2 of this specification. For 380 kV, the test shall be performed on a quad bundle conductors arrangement with inter spacing of 457 mm.
5.2
Sample Tests Sample tests to be carried out on the compression connectors shall include but not be limited to the following:
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TRANSMISSION MATERIALS STANDARD SPECIFICATION
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12-TMSS-02, Rev. 0
5.2.1
Visual Inspection
5.2.2
Galvanizing (zinc coating thickness) Test
5.2.3
Dimensional tests: These shall include length and diameter of the connectors before and after compression and percentage elongation.
Date of Approval: August 5, 2006 G
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TRANSMISSION MATERIALS STANDARD SPECIFICATION
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12-TMSS-02, Rev. 0
DATA SCHEDULE
COMPRESSION TYPE CONNECTORS FOR OVERHEAD TRANSMISSION LINES SEC Enquiry No.
Date:
SEC Purchase Order No. or Contract No.
Date:
SEC PTS No./Project Title with J.O. No. REFERENCE SECTION NO.
3.0
DESCRIPTION
'A'
'B'
'C'
APPLICABLE CODES AND STANDARDS Standards to which material shall conform
*
4.0
DESIGN AND CONSTRUCTION REQUIREMENTS
4.2
Design Criteria Voltage Class (69kV / 110kV / 115kV / 132kV / 230kV / 380kV) Corona Extinction Voltage (48kV / 80kV / 92kV / 160kV / 265kV) Conductor Type Conductor Size Current Rating (Amps) Mechanical Strength (kN)
*
'A'- SEC SPECIFIED DATA/PARAMETER. 'B'- BIDDER/SUPPLIER/VENDOR/CONTRACTOR PROPOSED DATA/PARAMETERS. 'C'- REMARKS SUPPORTING THE PROPOSED DEVIATION IN COLUMN 'B'. (*)- DATA/PARAMETER TO BE PROVIDED/PROPOSED BY THE BIDDER/SUPPLIER/ VENDOR/CONTRACTOR IN COLUMN 'B'.
12TMSS02R0/SW
Date of Approval: August 5, 2006 G
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TRANSMISSION MATERIALS STANDARD SPECIFICATION
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12-TMSS-02, Rev. 0
DATA SCHEDULE
COMPRESSION TYPE CONNECTORS FOR OVERHEAD TRANSMISSION LINES REFERENCE SECTION NO. 4.0
DESCRIPTION
'A'
a. b. c. d. e. f.
'C'
DESIGN AND CONSTRUCTION REQUIREMENTS (Continued) Material of Connector
a. b. c. d. e. f.
'B'
*
Type of Connectors Dead-end connectors Mid Span Splice Connectors Repair Sleeve Connectors Tee Tap Connectors Jumper Connectors Others (specify)
Yes Yes Yes Yes Yes
Design strength (as percentage of rated strength of conductor) Dead-end connectors (%) Mid Span Splice Connectors (%) Repair Sleeve Connectors (%) Tee Tap Connectors (%) Jumper Connectors (%) Others (specify) (%) Conductor Type
/ / / / / *
Yes Yes Yes Yes Yes
/ / / / /
No No No No No
* * * * * *
Connector die index number
*
Length before compression (mm)
*
Length after compression (mm)
*
Diameter before compression (mm)
*
Diamaeter after compression (mm)
*
Percentage elongation (%)
*
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No No No No No
Date of Approval: August 5, 2006 G
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TRANSMISSION MATERIALS STANDARD SPECIFICATION
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12-TMSS-02, Rev. 0
DATA SCHEDULE
COMPRESSION TYPE CONNECTORS FOR OVERHEAD TRANSMISSION LINES A.
ADDITIONAL TECHNICAL INFORMATION OR FEATURES TO BE FURNISHED BY SEC:
B.
ADDITIONAL SUPPLEMENTARY DATA OR BIDDER/VENDOR/SUPPLIER/CONTRACTOR:
C.
OTHER PARTICULARS TO BE FILLED UP BY BIDDER/VENDOR/SUPPLIER/ CONTRACTOR:
FEATURES
Actual Manufacturer of Equipment/Material
PROPOSED
BY
Vendor/Supplier/ Contractor
Name of the Company Location and address
Name and Signature of authorized epresentative and date
Official Seal/Stamp of the Company & Date
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Date of Approval: August 5, 2006 G
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