the israel electric corporation ltd...4.4.3 - iec publication 60230 "impulse test on cables...

Israel Electric Corporation Ltd. - Customer Division - National Network Unit Edition No.: 5 Specification NPS – 75

for Single Core XLPE Insulated Power

Cable U0/U = 26/45 kV

Issued date: February, 2018

THE ISRAEL ELECTRIC CORPORATION LTD.

National Network Unit

Specification No. NPS - 75

for

Single Core

Extruded Cross - Linked

Polyethylene (XLPE) Insulated

Power Cable

of

Rated Voltage U0/U = 26/45 kV

This issue supersedes specification NPS - 75/4

Haifa, Israel

February, 2018

Israel Electric Corporation Ltd. - Marketing Division - National Network Unit Edition No.: 5 Specification NPS – 75




Page No. 1 of 22

Contents

1 - General

2 - The IECo. catalogue Numbers

3 - Documents to be supplied with the Proposal

4 - Standards

5 - Technical Requirements

6 - Tests

7 - Marking

8 - Packing

9 - Quality Requirements

10 - Prototype approval

11- Questionnaire

Appendix “A” - Test requirements for cables manufactured according to

I.E.C .

Appendix “B” - Acceptance Test requirements

Appendix "C" - Quality Requirements for Contracts Execution

Appendix "D" - Schedule up to prototype approval

APPENDIX "E" – Statement of manufacturer experience

Prepared by : A. Lavian (- signed )

Approved by: N. Grinberg (- signed )





Page No. 2 of 22

1 - General

Scope

This specification defines the technical requirements of power cables with single core

copper/aluminum conductor, extruded solid cross-linked polyethylene insulation (XLPE) of

rated voltage Uo/U=26/45 kV (henceforth referred to as “Cables”).

The cables are designate to be installed in outdoor and underground networks with neutral point

earthed via Peterson Coil but operation with solidly earthed neutral point is also possible.

2 - The IECo catalogue Numbers

The IECo. catalogue Numbers and the relevant conductor cross-section:

Table 1

Type of Cable Conductor Cross Section (mm2) IECo Cat. No.

N2XS (F) 2Y 95 Cu 570754

N2XS (F) 2Y 240 Cu 329060

NA2XS (F) 2Y 240 Al 5228282

NA2XS (F) 2Y 300 Al 5254360

3 - Documents to be supplied with the Proposal

The Proposer shall submit all the following documents to the IECo. with the bid documents.

3.1 Complete and fill in “Questionnaire”;

3.2 A complete Type Test Reports, according to Israeli standard IS 1516-2, issued within the

last 7 years preceding the date of the bid, for the proposed cable or for a similar* cable.

3.3 Certificate issued by the Standards Institution of Israel (SII) or any agreed accredited

institution, attesting that the Manufacturer meets the requirements of the Israeli Standard

IS 1516-2 for MV power cables (identical to IEC standard 60502 part 2)

3.4 Cross-section drawings including dimensions;

3.5 Approval of conformance with ISO 9001 requirements shall be in a form of a certificate

issued by a Certification Body (CB) which is accredited by an Accreditation Body (AB).





Page No. 3 of 22

The certificate should bare the logo of the CB and of its AB and/or the logo of the IAF.

The certificate shall be valid on the date set for submission of the proposal.

The certificate shall be valid for the scope of activities requested in the request for

proposal.

3.6 Document approving experience: the manufacturer actively produced and supplied at

least 150 km of the proposed cable or similar* cable during a period of at least 3 years

during the last 7 years preceding the date of the bid. Additionally, The Proposer shall

submit reference list indicating the quantities of the cables manufactured and sold during

these years;

* Similar cable: Same construction, same conductor cross-section or bigger, the conductor

may be either copper or aluminum.

** All the above documents shall be in English.

4 - Standards

4.1 Standards referenced in this specification, and in supplements to this specification, form

an integral part of this specification.

4.2 All the standards referred to the most current issue, including all amendments, and

supplements, as of the date of the bid.

4.3 The cables that are provided under this specification, shall be designed, manufactured

inspected, tested and preserved in compliance with the standards as specified herein.

4.4 Relevant standards:

4.4.1 - Israeli Standard SI 60228 (IEC Publication 60228) "Conductors of Insulated

Cables";

4.4.2 - IEC Publication 60229 "Test on Cable Oversheaths"

4.4.3 - IEC Publication 60230 "Impulse Test on Cables & their Accessories"

4.4.4 - IEC Publication 60840 "Tests for Power cables with Extruded Insulation for

Rated Voltages Above 30 kV and up to 150 kV"





Page No. 4 of 22

4.4.5 - DIN VDE 0276- 620 part 5c Distribution Cables (3.6/6kV up to and including

20.8/36 kV): XLPE Insulated Single Core Cables with PE

or PVC sheath.

In case of differences between the present specification and the said standards, the

present specification is mandatory.





Page No. 5 of 22

5 - Technical Requirements

5.1 Operating Temperatures

5.1.1 Maximum rated conductor temperature: 90C

5.1.2 Short circuit maximum conductor temperature (for duration up to 5 sec): 250C

5.1.3 The conductor temperature under emergency condition: 130C for duration of 8 hours

continuously. The total duration of such overloads may exceed 100 hours per annual.

5.2 Construction

5.2.1 Conductor

5.2.1.1 Material: The conductor shall consist of plane annealed copper wires or aluminum

alloy.

5.2.1.2 Form: The conductor shall be class 2 stranded circular compacted.

5.2.1.3 Dimensions: Table 1 hereafter sets out the cross-sectional areas and characteristics of the

conductors covered by this specification.

Table 2

Nominal Cross-

Section

(mm2)

Diameter

Range

(mm)

Minimum

Number of Wires

Max. DC Resistance at

200C

(/km)

95 Cu 11.0 12.0 15 0.193

240 Cu 17.6 19.2 34 0.0754

240 Al 17.6 19.2 30 0.125

300 Al 19.7 21.6 30 0.100

5.2.2 Conductor Screen

5.2.2.1 The conductor screen shall consist of an extruded cross-linked semi-conducting compound

layer (HD 620, part 5-c sub-clause 2.2).





Page No. 6 of 22

This inner-semi-conducting layer shall not penetrate into the inner wire layers of the

conductor and shall be easily removable during installation. The wall thickness of the inner

semi-conducting layer shall be at least 0.3 mm.

5.2.2.2 Tapes are permitted under the inner-conducting layer if an electrical contact is guaranteed

between the conductor and the inner-conducting layer.

5.2.2.3 The irregularities in the conductor screen, shall be of sizes specified in sub-clause 2.5 of the

standard HD 620, part 5-c.

5.2.2.4 The Resistance, both before and after aging, shall not exceed 1000 m.

5.2.3 Insulation

5.2.3.1 The insulation shall be of extruded cross-linked polyethylene (XLPE).

5.2.3.2 The process of cross-linking or vulcanization may be achieved by any method except

"Curing in Steam" process.

5.2.3.3 The nominal thickness, not including the thickness of any separator or semiconducting

screen on the conductor and over the insulation, shall be 10.5 mm for all the cross-sectional

areas specified in Table 2 of this specification.

5.2.3.4 The average thickness of the insulation shall not be less than the specified nominal value.

5.2.3.5 The thickness at any place may however be less than the specified nominal value

provided that the difference does not exceed 0.1 mm +10% of the specified nominal value

(IEC 60840, sub-clause 4.6.2.a).

5.2.3.6 Wall thickness difference of the insulation between the lowest and the highest values in

one measured plane shall not exceed 1.1 mm.

5.2.3.7 Max. and min. diameter values over the insulation shall be as specified in Table 3:

Nominal

Cross-Section

(mm2)

Minimum

Insulation Diameter

(mm)

Maximum

Insulation

Diameter

(mm)

95 Cu 33.5 35.0

240 Cu 40.6 42.6

240 Al 40.6 42.6

300 Al 42.5 44.8

Table 3





Page No. 7 of 22

5.2.3.8 The irregularities (voids, impurities) in the insulation shall not exceed 0.2 mm as specified

in sub-clause 3.3 of standard HD 620 part 5-C.

.

5.2.4 Non-Metallic Insulation Screen

5.2.4.1 The semi-conducting screen shall be applied directly over the insulation and shall consist

of an extruded cross linked polyethylene. The semi-conducting screen shall be non-

peelable (bonded).

5.2.4.2 The maximum thickness of the semi-conducting screen shall be of 0.6 mm for all the

cables covered by this specification.

5.2.4.3 The minimum thickness of the semi-conducting screen shall be of 0.3 mm.

5.2.4.4 The diameter difference over the non-metallic insulation screen between the lowest and

the highest value shall be maximum 0.5 mm.

5.2.4.5 The inner and the outer semi-conducting layers shall not present any surface roughness,

shall be smooth, and shall adhere perfectly to the insulation all along its periphery.

5.2.4.6 The electric Resistivity of the layers, both before and after aging, shall not exceed

500 m at 200C .

5.2.4.7 Conductor screen, insulation and insulation screen shall be laid by triple extrusion

process.

5.2.5 Semi-Conductive Bedding Tape

A swelling semi-conductive Bedding tape shall be applied lapped all over the non-

metallic insulation screen.

5.2.6 Metallic Screen

5.2.6.1 A metallic screen shall be applied helical over the bedding semi-conductive tape. The

screen shall consist a concentric layer of copper wires, bounded together with one or

two copper tapes, having thickness of at least 0.1 mm and a minimum cross-sectional

area of l mm2.





Page No. 8 of 22

The copper tape shall be applied helical so that the helix lay will not be greater than the

cable diameter underneath the concentric layer of copper wires times 4.

5.2.6.2 The metallic screen dimensions and resistance shall be as specified in Table 4:

Table 4

Total Cross-Sectional Area

of the Screen Wires

[mm2]

Wires’ Minimum

Diameter

[mm]

Max DC Resistance of

the Screen at 200C

[/km]

25 0.5 0.727

5.2.7 Watertight Measures

5.2.7.1 The cables shall be longitudinally watertight protected on the screen area.

5.2.7.2 The watertight layer shall be made of special swelling tape.

5.2.8 Outer Sheath

5.2.8.1 The outer sheath shall be made of HDPE polyethylene compound, ST7 type (IEC

publication 60502-2 table 4).

5.2.8.2 The color of the outer sheath shall be black.

5.2.8.3 The nominal thickness shall be 2.5 mm and the minimum thickness shall be not less than

2.03 mm for all the cables covered by this specification.

5.2.8.4 The diameter over the outer sheath shall be within the range specified in Table 5:

Table 5

Conductor Cross Section

Area

[mm2]

Min. outer sheath

Diameter

[mm]

Max. outer sheath

Diameter

[mm]

95 Cu 41 47

240 Cu 48 54

240 Al 48 54

300 Al 50 57





Page No. 9 of 22

6 - Tests

6.1 General

Tests shall be performed in accordance with the requirements of Annex “A” of this

specification and will meet the latest published recommendations of the standards prescribed

under clause 4 of this specification, by and at the expense of the Contractor. In case that the

Proposer has a type test of one of the said standards, he will complete the tests according to

Annex “A”.

6.2 Type Tests

6.1 Type Test

Within 3 months after from the date on which a binding contractual obligation has been created,

the Contractor shall submit type test report that was performed on the first manufactured batch

of the cable to be supply to the IECo.

The type test shall be performed according to Annex "A" in an independent authorized laboratory

(ISO/IEC 17025 or EN 45011 approved).;

The IECo. reserves the right to attend during the performance of the Type Test

Exemption: If the Contractor had supplied identical cable to the IECo. during the last 7 years

preceding the date of the present bid, and if the manufacturing method was not changed, the

Contractor can introduce type test report if it was approved by the IECo. in the former supply.

6.2 Routine Tests

The Contractor shall perform and submit test reports for all routine tests for each cable that is

wrapped on each drum.

The Contractor shall submit to IE Co. the routine test reports for approval prior to delivery of

the cable

The cable shall be delivered only after approval of the routine test report of the cable.





Page No. 10 of 22

6.3 Acceptance Test

Acceptance tests shall be performed according to the standards in para. 3 and shall include tests

required in Appendix "B"

In case that the cable under test will not fulfill all requirements specified in Appendix "B" the

IECo. has the right to reject the consignment.

6.4 The tests shall be performed by and at the expense of the Contractor. The contractor shall make

all the necessary arrangements to enable the IECo.’s inspectors to be present at the tests.

6.5 The following data shall be indicated on each test certificate:

Manufacturer's name;

Name and address of the testing laboratory;

Serial number of the test certificate;

The certificate issue date;

Test report of special test shall specify the pertained batch number of the cables;

A signature of the person responsible for tests and his position.

6.6 The test certificate should contain results for each test according to the test requirements with

reference to appropriate Clauses and Sub-clauses of standards and this specification.





Page No. 11 of 22

7 - Marking

Throughout whole cable length, at intervals not exceeding 100 cm, the following identification

marks shall be indelibly imprinted in white color, embossed or by reproduction in relief on the outer

sheath.

a) Manufacturer’s name or trade mark (logo)

b) The structure: " N2XS (F) 2Y - l x (cross-sectional area in mm2), 18/30 kV "

c) Year of production

d) "Property of the Israel Electric Corp."

e) Running length (in meters) No. marked on each one of the cable ends (the first and the

last No.)

8 - Packing

8.1 The following data shall be printed legibly on a tag strongly attached on each drum:

f) Manufacturer's Name g) The IECo. Order No.

h) Drum Serial No. i) Manufacturing Date

j) Cable Type k) Cross Sectional Area in mm2

l) Cable Length m) Gross Weight

n) Cable Standard o) The IECo. Catalog No.

p) The IECo. Specification No. (NPS-75) l) Manufacturer's Plant address

8.2 The cables shall be furnished in lengths of 500÷650 (±5) meters wound on seaworthy metal or

metal framed wooden drums. The accurate length and type of drum should be coordinated

according to the tender requirements.

The cable on the drum shall be protected against damage by a suitable cover easy to be

removed, mounted around the drum flanges, so that the drum shall be closed from all sides.

8.3 The supplied drums shall be with max. flange diameter 2240 mm and max. width 1200 mm.

8.4 The supplied cable's ends shall be hermetically sealed with watertight caps that shall prevent

the ingress of humidity and fine dust into the cable's ends.





Page No. 12 of 22

8.5 COT of the conductor material should be attached to each consignment;

9- Quality Requirements

For quality system and other specific quality requirements, see Appendix A: Q-APP-02.

Bidder shall submit with his proposal the following (In English):

Quality system Certificate;

Quality manual;

Certificates that demonstrate the Bidder's compliance with the requirements specified

or implied in this specification;

Example of an inspection & test plan and/or Quality plan which pertain to the cable to

be supplied;

Formal confirmation that he will conform to the requirements of Q-APP-02.





Page No. 13 of 22

10 PROTOTYPE APPROVAL

10.1 Prototype approval for new suppliers.

New supplier – Supplier that didn’t supply the ordered item to the IECorp. in the last five (5) years.

10.1.1 In a period of max three (3) months from the date on which a binding contractual obligation

has been created, and before production for IEC of all ordered items, the Contractor shall perform

Prototype Approval

10.1.2 For purposes of the Prototype approval, the manufacturer shall perform the complete type

tests as required in this specification.

10.1.3 The contractor shall be responsible to conduct successfully all the necessary tests, and to

deliver to the Israel Electric Corp. all the necessary required reports, in a manner, which will not

interfere with or delay any of the time schedules, pertaining to any action or undertaking, required of

the winning bidder, including, but not limited to delivery schedule. Such responsibility shall include

proper and reasonable advance notifications to the Israel Electric Corp., prior to any action, required

of it.

If type and special tests have already been conducted with reference to the identical cable which is

offered by the proposed and the Israel Electric Corp. approves the reports, pertaining to such tests,

the Israel Electric Corp. shall have a right (but not a duty) to waive all or part of the required tests.

10.1.4 The Israel Electric Corp. reserves the right to cancel the order for the supply of equipment if

the prototype will not be approved by the Israel Electric Corp. In any case, the contractor shall not

resume manufacture of the rest of the ordered equipment before receiving the Israel Electric

final approval of the prototype.

10.1.5 Required schedule up to prototype approval (after notification of award) is attached in

APPENDIX: "D".





Page No. 14 of 22

11 – Questionnaire

Tender No.: __________________ Name of Proposer : ________________

Subject Insert all data in this column

Manufacturer’s name and address

Specify the standards that the cable will comply:

1 – Cable

1.1 Coding

1.2 Rating voltage (U0/U) (kV)

1.3 Current rating (in soil having 1 km/W at 300C, at a load

factor of 1.0, laying depth 0.7 m) (A)

1.4 Short circuit rating current for 5 sec duration (A)

1.5 Corona level (pC/kV)

1.6 Inductive resistance at 50 Hz (Ω/km)

1.7 AC effective resistance at 900C (Ω/km)

1.8 Capacitance (F/km)

2 – Conductor

2.1 Material:

2.2 Nominal cross-sectional area (mm2)

2.3 Number and nominal diameter of wires (mm)

2.4 Designed diameter (mm)

2.5 Max DC resistance at 200C (Ω/km)

2.6 Max permissible continuous temp. (0C)

2.7 Max permissible Short circuit temp. (0C)





Page No. 15 of 22

3 – Conductor Screen

3.1 Material:

3.2 Min thickness (mm)

3.3 Max electrical resistivity at operating temp. (Ω/km)

3.4 The irregularities sizes (mm)

4 - Insulation

4.1 Material:

4.2 Nominal thickness (mm)

4.3 Nominal diameter (mm)

4.4 Difference between lowest and highest value of wall

thickness in one measured plane (mm)

4.5 Dielectric permeability

5 - Non-Metallic Insulation Screen

5.1 Material:

5.2 Extruded layer peelabe / non-peelable

5.3 Thickness (min – max) (mm)

5.4 Max electrical resistivity at operating temp. (Ω/km)



6 - Bedding semi-conductive tape is applied on the

nonmetallic insulation screen Yes/No

7 - Metallic Screen

7.1 Number and diameter of wires (mm)

7.2 Number, thickness and width of tapes (mm)

7.3 Nominal cross-sectional area (mm2)

7.4 Electrical resistance at 200C (Ω/km)





Page No. 16 of 22

8 - A swelling tape shall be applied over the metallic screen (yes/no)

9 - Outer Sheath

9.1 Material:

9.2 Nominal thickness (mm)

9.3 Nominal diameter (mm)



9.5 Color:

9.6 Marking embossed according sub-clause 7

10 - General Data

10.1 Cable Weight (kg/km)

10.2 Permissible bending radius (m)

10.3 Permissible pulling force (kg)

11 - Drum

11.1 Type:

11.2 Material:

11.3 Weight of empty drum (kg)

11.4 Flange diameter (cm)

11.5 Barrel diameter (cm)

11.6 Overall Width (cm)

11.7 Gross weight (drum with cable) (kg)

11.8 Length of cable per drum (kg)

12- Packing

12.1 A tag with all details as required in sub-clause 8.1 shall be

attached

Yes/No

12.2 The cable shall have sealing caps Yes/No

12.3 The drum shall be protected as required in sub-clause 8.2 (Yes/No)





Page No. 17 of 22

13 - Attached Documents

13.1 The IEC certification of being in the list of approved

suppliers (Yes/No)

13.2 ISO 9001:2000 certificate (valid in the questionnaire date)

(Yes/No)

13.3 Catalogue (Yes/No)

13.4 Inspection and test plan, QA manual (Yes/No)

Proposer’s address: Email address:

Fax. No. : Tel. No. :

Contact: Cellular:

Date: Signature:





Page No. 18 of 22

Annex "A"

TEST REQUIREMENTS

for

CABLES MANUFACTURED

ACCORDING TO

The IECo SPECIFICATION NPS - 75





Page No. 19 of 22

Annex "B"

SPECIFICATION

for

ACCEPTANCE TESTS

of

CABLES MANUFACTURED

ACCORDING TO

The IECo. SPECIFICATION NPS - 75

–





Page No. 20 of 22

QUALITY SPECIFICATIONS

THE ISRAEL ELECTRIC CORPORATION LTD.

ORGANIZATION AND QUALITY DIVISION QUALITY CONTROL UNIT

Q - APP - 02 3

03/2005

Spec. No. Rev.

Status Volume

APPENDICES FOR CONTRACTS / ORDERS TITLE

QUALITY REQUIREMENTS FOR CONTRACTS EXECUTION

SUB TITLE

ANNEX "C"

ORGANIZATION, QUALITY AND SAFETY DIVISION

QUALITY CONTROL UNIT

APPENDIX FOR CONTRACTS / ORDERS

REV. 4

Volume 03/ 2011

Spec. No. Q - APP - 02

QUALITY REQUIREMENTS





Page No. 21 of 22

Appendix. D – Schedule for prototype approval





Page No. 22 of 22

APPENDIX "E" - STATEMENT OF MANUFACTURING EXPERIENCE

I, ______________________________ (Enter name), do hereby state the following:

1. I am a position holder at ________________________ ("The factory") occupying the position of

____________________________ (Enter job title and description, i.e. partner, production

manager, sales manager, etc.)

2. I have been occupying this position since ___________________ (Enter date).

3. I give this statement in regards to I.E.C Tender number __________________ ("The Tender").

4. The facts/details given in this statement have been checked and verified by me.

5. _________________ (The factory) has actively produced and supplied at least 150 km of the

proposed cable or similar* cable during a period of at least 3 years during the last 7

years prior to submission.

* Similar cable: Same construction, same conductor cross-section or bigger, the conductor

may be either copper or aluminum.

6. I hereby undertake to provide, upon IEC's request and at its sole discretion, any other documents

(reference list, quantity ,dates of supply, letter of recommendations etc ) or other information

requested for this Tender for purposes of proving said experience.

_______________

Signature

_______________

Date