TRANSMISSION MATERIALS STANDARD SPECIFICATION 11-TMSS-01...

PAGE NO. 2 OF 1611TMSS01R0/AAG

Date of Approval: May 30, 2006

11-TMSS-01, Rev. 0TRANSMISSION MATERIALS STANDARD SPECIFICATION

TABLE OF CONTENTS 1.0 SCOPE 2.0 CROSS REFERENCES 3.0 APPLICABLE CODES AND STANDARDS 4.0 DESIGN AND CONSTRUCTION REQUIREMENTS 4.1 General 4.2 Design Criteria 4.3 Materials 4.4 Fabrication 4.5 Marking 5.0 TESTS 5.1 Routine and Type Tests 5.2 Production Sampling Tests 6.0 PACKING AND SHIPPING FIGURE 1: Cross-Section of XLPE Insulated, 69kV Power Cable (Typical) FIGURE 2: Reel Marking Locations 7.0 DATA SCHEDULE




1.0 SCOPE This Transmission Material Standard Specification (TMSS) specifies the minimum technical

requirements in respect of design, engineering, fabrication, construction, inspection, testing and performance of XLPE insulated, single core, aluminum or copper power cable, rated 69kV intended to be used in the Transmission System of Saudi Electricity Company, Kingdom of Saudi Arabia.

2.0 CROSS REFERENCES 2.1 This Transmission Material Standard Specification shall be read in conjunction with

the Transmission General Specification No. 01-TMSS-01, titled "General Requirements for All Equipment/Materials", which shall be considered as an integral part of this TMSS.

2.2 This TMSS shall also be read in conjunction with Transmission Business Unit

(TBU) of SEC Purchase Order or Contract Schedule for project, as applicable. 3.0 APPLICABLE CODES AND STANDARDS The latest edition of the following Codes and Standards shall be applicable for the

equipment/material covered in this TMSS. In case of conflict, the vendor/ manufacturer may propose equipment/material conforming to one group of Industry Codes and Standards quoted hereunder without jeopardizing the requirements of this TMSS.

3.1 IEC 60228 : Conductors of Insulated Cables

3.2 IEC 60840 : Power Cables with Extruded Insulation and Their Accessories for Rated Voltages Above 30kV (Um = 36kV) up to 150kV (Um=170kV)- Test Methods and Requirements.

3.3 IEC 60949 : Calculation of Thermally Permissible Short-Circuit

Currents, Taking into Account Non-Adiabatic Heating Effects

3.4 ICEA P-45-482 : Short Circuit Performance of Metallic Shields and

Sheaths of Insulated Cable 3.5 AEIC CS7 : Specifications for Cross Linked Polyethylene Insulated

Shielded Power Cables Rated 69 through 138kV 4.0 DESIGN AND CONSTRUCTION REQUIREMENTS 4.1 General 4.1.1 The power cable shall meet or exceed the requirements of this Specification

in all respects.




4.1.2 Manufacturer's drawings shall show the outline of the power cable, together with all pertinent dimensions. Any variations in these dimensions due to manufacturing tolerances shall be indicated.

4.2 Design Criteria 4.2.1 Unless otherwise specified, the cable shall be manufactured in accordance

with AEIC CS7 and tested in accordance with AEIC CS7 or IEC 60840. 4.2.2 The power cable shall be designed for ambient temperature conditions

specified in 01-TMSS-01. 4.2.3 The cable shall be designed to withstand a conductor temperature of 130°C

without any detrimental effects on any of its components. However, the cable sizing shall be based on a maximum permissible continuous temperature of 90°C and emergency loading temperature of 105°C.

4.2.4 The cable design shall prevent ingress of water radially and longitudinally.

Manufacturer shall clearly indicate the cable components providing the above water ingress prevention.

4.2.5 The construction of the cable shall be essentially as shown in Figure 1. The

ratings and dimensions shall be as indicated in the Data Schedule. 4.3 Materials 4.3.1 Conductor The conductor shall be circular, compacted or compacted segmental, stranded

aluminum or copper, class 2 per IEC 60228. The conductor sizes shall be 400, 630, 800, 1000, 1200, 1400, 1600 or 2000 mm².

4.3.2 Conductor Shield The conductor shield shall consist of an extruded black thermosetting

semiconducting material compatible with the conductor and the extruded insulation. A suitable semiconducting tape may be applied between the conductor and the specified extruded semiconducting layer.

The average thickness and minimum thickness of the conductor shield shall

be as indicated in the Data Schedule. 4.3.3 Insulation The insulation shall be super clean cross-linked polyethylene (XLPE). The average thickness and minimum thickness of the insulation shall be as

indicated in the Data Schedule.




4.3.4 Insulation Shield The insulation shield shall consist of an extruded black thermosetting

semiconducting material compatible with the XLPE insulation. The average thickness and minimum thickness of the insulation shield shall

be as indicated in the Data Schedule. 4.3.5 Metallic Shield The metallic shield shall consist of copper wires with or without binding

copper tape(s). The minimum short circuit current rating of the above metallic shield for one

second duration shall be as indicated in the Data Schedule. IEC 60949 or ICEA Publication P-45-482 shall be used by the manufacturer

to determine the effective cross-sectional area of the metallic shield and its short circuit current carrying capability.

The individual strand of copper wires shall be sized to withstand mechanical

stresses experienced during cable pulling and splicing. 4.3.6 Moisture Impervious Layers The moisture impervious layers shall consist of the following: a. First Layer (longitudinal water barrier) - a layer of semiconductive

water blocking tape or powder between the insulation shield and the metallic shield. The thickness of this first moisture impervious layer shall be independent of that of the extruded insulation shield.

b. Second Layer (longitudinal water barrier) - a layer of semiconductive

water blocking tape or powder between the metallic shield and the third layer.

c. Third layer (radial water barrier) - a layer of aluminum foil coated

with ethylene acrylic acid copolymer or equivalent between the second layer and the overall jacket.

4.3.7 Jacket The jacket material shall be black linear low density polyethylene (LLDPE)

or linear medium density polyethylene (LMDPE) The average and minimum thickness of the jacket shall be as indicated in the

Data Schedule.




4.3.8 Conductive Layer A conductive layer shall be applied over the jacket to serve as an electrode

for testing the integrity of the jacket. The thickness of the conductive layer shall be sufficient so that the jacket

integrity test can be done successfully. Thickness shall be as indicated in the Data Schedule.

4.4 Fabrication 4.4.1 The conductor shield, cross-linked polyethylene insulation and insulation

shield shall be extruded by the simultaneous triple extrusion method to assure homogeneity between the insulation and the semiconducting shields.

The insulation shield shall be bonded firmly and continuously to the

insulation. 4.4.2 The cross-linking process shall be by the dry cure dry cooling or dry cure wet

cooling method. 4.4.3 The power cable shall be free of material and manufacturing defects which

would prevent it from meeting the requirements of this Specification. 4.5 Marking 4.5.1 The jacket for all the cables shall be embossed marked in Arabic and English

at intervals not exceeding one meter with the following minimum information:

a. Electric Cable b. Voltage designation, 69kV c. Type of insulation, XLPE d. Insulation thickness, mm e. Conductor cross-sectional area, mm² and material f. The manufacturer's name or trademark g. Year of manufacture h. Cumulative length at every one meter with the highest length mark on

the outer end of the cable. 4.5.2 All cables shall be marked with “ Property of Saudi Electricity Company” in

both Arabic and English. 4.5.3 Marking by matrix print is not acceptable.




5.0 TESTS All tests results shall be provided for review and acceptance by TBU. 5.1 Routine and Type Tests 5.1.1 Routine and type tests per AEIC CS7 or IEC 60840 are acceptable. 5.1.2 A longitudinal water tightness type test shall be conducted on the cable in

accordance with the requirements of IEC 60840. 5.1.3 The completed reeled cable partial discharge test data shall be submitted on a

printout sheet of an X-Y recorder showing the partial discharge curve of each cable.

5.2 Production Sampling Tests 5.2.1 Production sampling tests shall be conducted on the cable in accordance with

the requirements of AEIC CS7. 5.2.2 Production quality requirements for the insulation and semi-conducting

shields shape as per AEIC CS7. 6.0 PACKING AND SHIPPING In addition to the applicable items per 01-TMSS-01, packing and shipping of the cable shall

conform to the following : 6.1 A pulling eye attached to the conductor shall be provided at the outside cable end of

each cable shipping length. 6.2 The cable ends shall be sealed with a waterproof, heat shrinkable plastic or

elastomeric end cap with adhesive type sealing compound. Cable ends shall be properly secured to the reel.

6.3 The cable shall be delivered without splices, on standard sized non-returnable steel

drums of sturdy construction properly packed and lagged externally to prevent the cable from possible damage during transport. Wood lagging shall be used and have a minimum thickness of 50mm.

6.4 Reel Markings 6.4.1 Cable reels/drums shall be marked in legible and indelible letters giving the

following particulars: a. Cable voltage and conductor size b. Type of cable c. Length and weight of cable on reel d. Gross weight




e. Dimensions of reel f. Manufacturer's name and country of origin g. TBU Purchase Order number h. J.O. number/Contract number (if applicable) i. Serial number of reel j. TBU stock number in 10 cm high bold numerals. k. Direction of rolling of reel l. 11-TMSS-01, Rev. 0 Reel marking locations shall be as shown in Figure 2. 6.4.2 All markings shall appear on both sides of the reel.

6.4.3 Cable reel identification shall include any additional information as required by the TBU shipping instructions.




7.0 DATA SCHEDULE

69kV, XLPE POWER CABLE

SEC Enquiry No. Date: SEC Purchase Order No.

Date:

or Contract No. SEC PTS No./Project Title with J.O. No. REFERENCE SECTION NO. DESCRIPTION 'A' 'B' 'C' 3.0 APPLICABLE CODES AND STANDARDS * 4.0 DESIGN AND CONSTRUCTION REQUIREMENTS 4.2 Design Criteria/Rating a. Reference Manufacturing Standard AEIC b. System Short Circuit Current, kA 40 c. Maximum conductor short circuit current

temperature, °C 250

4.2 d. Maximum permissible continuous conductor temperature, °C 90

e. Emergency Loading • Maximum emergency conductor

loading temp.,°C 105

• Permissible Load in Amps, A * • Allowable loading duration; hrs

i) During any 12 months 72 ii) During the life of the cable 1500 4.3 Material Details : 4.3.1 Conductor : Material (A1 or Cu?)

'A' - TBU SPECIFIED DATA/PARAMETERS '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'




7.0 DATA SCHEDULE

69kV, XLPE POWER CABLE REFERENCE SECTION NO. DESCRIPTION 'A' 'B' 'C' No. of strands (400mm², 630mm²) ≥ 53 (1200mm² or 2000mm²) Dia. of strand prior to compaction, mm * Cross-sectional area, mm² (400, 630,1200 or 2000) Diameter, mm Resistance at 20°C, Ω/km Temp. coefficient at 20°C/°C * Skin effect loss factor (ks) * Proximity effect loss factor (kρ) * DC resistance at 90°C, Ω/km AC resistance at 90°C Ω/km Short circuit capability of conductor in kA

for 1 second starting with 90°C conductor temperature up to max. short circuit current temperature

4.3.2 Conductor shield: Material SEMICON Average thickness, mm 400mm² 0.625 630 to 2000mm² 0.750 Minimum thickness, mm 400mm² 0.5 630 to 2000mm² 0.6 Dia. over conductor shield, mm *




7.0 DATA SCHEDULE

69kV, XLPE POWER CABLE REFERENCE SECTION NO. DESCRIPTION 'A' 'B' 'C' Thermal resistivity, K.m/W * 4.3.3 Insulation: Material SUPER

CLEAN XLPE Average thickness, mm 16.5 Minimum thickness, mm 14.85 Diameter over insulation, mm * Thermal resistivity, K.m/W * Relative permittivity or

dielectric constant (ε) *

Loss factor (δ ) * Specific Resistance, MΩ-km

(Actual Test Value) *

4.3.4 Insulation shield: Material SEMICON Average thickness, mm 1.720 Minimum thickness, mm 1.375 Diameter over insulation shield, mm * Thermal resistivity, K.m/W * 4.3.5 Metallic shield: Material COPPER Wire size, mm² * No. of wires * Binding Copper tape * thickness, mm * Total effective cross-sectional area mm² * Diameter over metallic shield, mm * Temp. coefficient at 20°C,/°C * DC resistance at 20°C, Ω/km * AC resistance at 20°C Ω/km * Self inductance, mH/km * Short circuit capability in kA for 1 second

of the metallic shield computed per ICEA Publication P-45-482, starting with 90°C conductor temperature :




7.0 DATA SCHEDULE

69kV, XLPE POWER CABLE REFERENCE SECTION NO. DESCRIPTION 'A' 'B' 'C' 4.3.6 Moisture impervious layer (first layer): Material SEMI-CONDUCTIVE

SWELLING TAPE OR POWDER

Thickness, mm 0.25 Diameter over the layer, mm * Moisture impervious layer (second layer): Material SEMI-CONDUCTIVE

SWELLING TAPE OR POWDER

Thickness, mm 0.25 Diameter over the layer, mm * Moisture impervious layer (third layer): Material Coated Aluminum Foil Thickness, mm * Diameter over the layer, mm * 4.3.7 Jacket: Material (LLDPE or LMDPE?) Average thickness, mm 3.95 Minimum thickness, mm 3.55 Overall cable diameter, mm * 4.3.8 Conductive layer : Material * Thickness, mm * 6.0 PACKING a. Total quantity required, m b. Are matched sets of cable reel

length required?

c. If "YES", how many reels are required per set?

d. Tolerance in cable length of matched reel sets

e. Conductor weight, kg/km * f. Cable weight, kg/km * g. Reel and cable weight, kg * h. Cable length per reel, m *




7.0 DATA SCHEDULE

69kV, XLPE POWER CABLE REFERENCE SECTION NO. DESCRIPTION 'A' 'B' 'C' i. Cable reel diameter, mm * j. Cable reel width, mm * OTHER REQUIRED INFORMATION a. Life expectancy of cable, years Over 30

b. 3-phase inductance in trefoil formation, mH/km *

c. 3phase capacitance in trefoil

formation µF/km

*

d. Maximum permissible overload in

% of 3 cables in underground cable duct trefoil formation, at 40°C soil temperature, for 1/2/3 hours (I1-hour/ I2-

hours/I3-hours) starting with a prior loading of

I1-hour/ I2-hours/

I3-hours

I1-hour/ I2-hours/

I3-hours

50% / / / / 75% / / / / 100% / / / / e. Maximum pulling Tension (kN) * f. Maximum sidewall pressure, kN/m * g. Minimum bending radius, mm *




7.0 DATA SCHEDULE

69kV, XLPE POWER CABLE

ADDITIONAL TECHNICAL INFORMATION OR FEATURES TO BE FURNISHED BY SEC:

A.

ADDITIONAL SUPPLEMENTARY DATA OR FEATURES PROPOSED BY BIDDER/VENDOR/SUPPLIER/CONTRACTOR:

B.

OTHER PARTICULARS TO BE FILLED UP BY BIDDER/VENDOR/SUPPLIER/ CONTRACTOR:

B.

Actual Manufacturer

of Equipment/Material 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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