Cap Ngam 24KV-1x500mm2

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HCMC PC SPECIFICATION

24KV SINGLE CORE UNDERGROUND CABLE

I. SCOPE :

This specification is applicable to medium voltage single core shieldedpower cable insulated with a EPR or XLPE dielectric.

II. STANDARD OF MANUFACTURE AND TEST :

- ICEA - S68 -516 : EPR - insulated wire and cable for the transmissionand distribution of electrical energy.

- AEIC CS6-87 : EPR - insulated shielded power cables rated 5 through69 KV

- ICEA - S66 -524 : XLPE - insulated wire and cable for the transmissionand distribution of electrical energy.

- AEIC CS5-87 : Thermoplastic and crosslinked polyethylene insulatedshielded power cables rated 5 through 35 KV.

III. DESCRIPTIONS :

A. SERVICE CONDITIONS :

- The single core underground cable shall be designed and fabricated,suitable for installation in the conduit, trench or direct burial underground in wet and dry locations.

- The cables are capable of operating continuously at a maximum

conductor temperature of 90C for normal operation, 130C for

emergency overload conditions, and 250C for short circuit conditions

B. CONSTRUCTION :

Basic construction : Single core concentric compact stranded copper,extruded semi-conducting EPR or XLPE compound conductor screen, EPRor XLPE insulation, extruded semi-conducting EPR or XLPE compound

insulation screen, copper shield tape, binder tape and PE oversheath.

1. Conductor :

- The conductor is constructed from stranded round uncoated softcopper wires. These wires are compacted to minimize diameter of

conductor.- Nominal area of conductor : 500 mm2 .

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- Maximum resistance of conductor at 25 C : 0.0349 /Km2. Conductor screen :

- The screen should be an extruded layer of semi-conducting XLPEcompound for XLPE insulated cable or EPR compound for EPRinsulated cable .

- The minimum average thickness of the screen should be not less than0.635 mm, and the minimum thickness at any point should be not lessthan 0.508 mm .

- Volume resistivity of conductor screen at 90C and 130C : 1000-m- The screen should be easily removable from the conductor and

inseparably bonded the overlaying insulation. It should be compatible

with the insulation and have allowable operating temperatures equalto or higher than those of the insulation .

3. Insulation :

- The insulation should be cross-linked polyethylene (XLPE) or ethylenepropylene rubber (EPR) , and its average thickness shall not be lessthan 6.6 mm (100 % insulation level). The minimum thickness at anycross-section of the insulation should be not less than 90 % of theabove average thickness .

- The insulation should be triple-tandem extruded with the conductor

screen and insulation screens in order to prevent inter surfacecontamination.

- Technical requirements :+ Rate dvoltage : 24 KV+ Maximum partial discharge :

. at Vt = 14,5 KV : 5pc

. at Vt = 21,5 KV : 5pc

. at Vt = 36,0 KV : 5pc

. at Vt = 43,5 KV : 5pc

. at Vt = 57,5 KV : 5pc+ Power frequency withstand voltage for 05 min : 52 KV+ DC withstand voltage for 15 min : 100 KV

+ Lightning impulse (1.2/50s wave) withstand voltage : 150KV

+ Minimum insulation resistance : 3,336M-303m

4. Insulation screen .

- The screen should be an extruded layer of semi-conducting XLPEcompound for XLPE insulated cable or EPR compound for EPR insulatedcable .

-The peel strength when stripping the extruded insulation screen fromthe insulation shall be tested per AEIC CS-5 D1-1 for XLPE insulatedcable or AEIC CS-6 D1-1 for EPR insulated cable.


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- The maximum thickness of the extruded screen should be 2.159 mmand the minimum thickness of the screen should be 1.016 mm.

- Volume resistivity of insulation screen at 90C and 110C : 500 -m

-The outer surface of the insulation screen should be continuouslyprinted with contrasting colored ink LOP BAN DAN : LOAI BO KHILAM HOP NOI - ATTENTION : REMOVE WHEN CONNECTING.

5. Metallic shield : The extruded shield should be covered with onecontinuous bare copper tape which should be 0.127 mm thick andapplied spirally with a 12.5 % nominal overlap.

6. Binder tape : A layer of non-metallic tape shall be lapped on themetallic shield.

7. Oversheath :

- Oversheath should be a 2.79 mm extruded polyethylene (PE)containing a termite repellent additive.

- The minimum thickness at any point should be not less than 80 % ofthe above specified values .

8. Cable identification :

The following identifying legend should be repeatedly embossed on the

outer surface of the PE oversheath at one meter intervals :

- Type of cable : 24 KV XLPE (EPR) / PE 1C - CU -500 mm2.- Manufacturer's name :- Year of manufacture :

9. Metre marking of cable :

- Cable length should be sequentially marked numerically at 1mintervals . The metre marking should be limited to six digits and anydrum length may start at any integral number . The height of thenumber should be not less than 5 mm .

- The cable should be wound on the drum with the lowest number at thedrum outer end.

10. Length of cable per drum :

a/ Length of cable per drum : Tenderer shall offer clearly the length anddimension of drum.b/ Cable drum :


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- Maximum outside diameter of cable drum : 2.5m- Maximum width of cable drum : 1.4m- The central hole of the cable drum shall be reinforced with a steel

plate of thickness not less than 10mm to fit for an axle size 95mmdiameter

11. Continuous current : 640 AThe above continuous current shall be calculated at the followingconditions :- Installation : Direct burial under ground, flat form.

- Ground temperature : 15C

- Maximum conductor temperature : 90C

- Thermal resistivity of soil : 1.2Cm/W

-Depth of burial cable : 0.8m

12. Short time withstand current : The cable must withstand the shortcircuit current of 70KA for one second without damage. (based on initialtemperature of conductor of 90C and final temperature of 250C forcopper screen)

IV. TESTING REQUIREMENTS :

1. Testing items :

a. Routine tests :

- Power frequency voltage withstand dry test on the main circuit- Measurement of the resistance of the main circuit- Mechanical operation tests

b. Type tests :

- Dielectric tests- Radio interference voltage test

- Temperature rise tests- Measurement of the resistance of the main circuit- Short time and peak withstand current tests- Test to prove the short-circuit making performance- Operating and mechanical endurance tests- Operation at the temperature limit

2. Requirements :

In order to ensure the quality of supplied goods , in case of bidwinning , the Tenderer shall supply routine test and copies of type test

reports met the following requirements :

a. Routine test shall be performed for each equipment.


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b. Type test report shall be approved by an lawful, reputable,independent testing laboratory with the following content :

- Testing sample : the same as the supplied item (manufacturer,country of origin, manufactures code as specified in tender document).

- Testing items : Including at least testing items as specified inSection IV.1 of this specification.

- Testing values shall be corresponding values as stated in Section IIIof this specification. If in section III, there are no corresponding values,testing values will be selected according to the standard specified insection II of this specification.

V. REQUIREMENT OF TENDER TECHNICAL DOCUMENTS :

- Detailed summary of deviations to inquiry specification.- Completed inquiry data sheet expressed at section VI of this

specification.- Catalogues containing outline dimensions, electrical data and

installation details.- Certificate of quality management.- Dimension drawings of cable drum.- The proposal bidding has Type Test Report which meets the

requirements as specified in item IV 2.b will be preferable .

VI. DATA SHEET :

No

SPECIFICATION UNIT REQUIREMENT TENDER

1. Item No.2. Manufacturer3. Country4. Manufacturers code5. Standards of factory and

test- ICEA - S68 -516and AEIC CS6-87

OR- ICEA - S66 -524and AEIC CS5-87

6. Standards of qualitymanagement

7. Member approve ofcertificate of management

8. In case of bid winning , theTenderer shall supplyroutine test and copies of

type test report met therequirements of section IV .

Yes

A. SERVICE CONDITIONS


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9. The single coreunderground cable shall bedesigned and fabricated,

suitable for installation inthe conduit, trench ordirect burial under groundin wet and dry locations.

Yes

10. The cables are capable ofoperating continuously at amaximum conductor :- for normal operation- for emergency overload

conditions-

for short circuitconditions

C

C

C

90130

250

B. CONSTRUCTION :11. Basic construction Single core

concentric compactstranded copper,extruded semi-

conducting EPR orXLPE compound

conductor screen,EPR or XLPE

insulation, extrudedsemi-conducting EPRor XLPE compoundinsulation screen,

copper shield tape,binder tape and PE

oversheath.1. Conductor :

12. - The conductor isconstructed fromstranded round uncoatedsoft copper wires.

- These wires arecompacted to minimizediameter of conductor.

Yes

Yes

13. - Nominal area ofconductor

mm2 500

14. - Maximum resistance ofconductor at 25 C

0.0349 /Km

2. Conductor screen :15. - The screen should be an

extruded layer

semi-conducting

XLPE compound forXLPE insulated cable

or EPR compound


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for EPR insulatedcable .

16. - The minimum averagethickness of theconductor screen

mm 0.635

17. - The minimum thicknessat any point of theconductor screen

mm 0.508

18. - Volume resistivity of

conductor screen at 90C

and 130C

-m 1000

19. The screen should be easilyremovable from the

conductor and inseparablybonded the overlayinginsulation. It should becompatible with theinsulation and haveallowable operatingtemperatures equal to orhigher than those of theinsulation .

Yes

3. Insulation :20. Material cross-linked

polyethylene (XLPE)or ethylene

propylene rubber(EPR)

21. Average thickness ofinsulation

mm 6.6

22. The minimum thickness atany cross-section of theinsulation

mm 90 % averagethickness

23. Requirement of fabricated

method conductor screen,insulation and insulationscreen

The insulation should

be triple-tandemextruded with theconductor screnn

and insulationscreens in order to

prevent inter surfacecontamination.

24. Rated voltageMaximum partial discharge :. at Vt = 14,5 KV. at Vt = 21,5 KV. at Vt = 36,0 KV. at Vt = 43,5 KV

KV

pcpcpcpc

24

5555


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. at Vt = 57,5 KV pc 525. Power frequency withstand

voltage for 05 minKV 52

26. DC withstand voltage for 15min

KV 100

27. Lightning impulse (1.2/50swave) withstand voltage

KV 150

28. Minimum insulationresistance

3,336 M-303m

4. Insulation screen .29. The screen should be an

extruded layersemi-conducting

XLPE compound forXLPE insulated cable

or EPR compound forEPR insulated cable

30. The peel strength whenstripping the extrudedinsulation screen from theinsulation

According to AEICCS-5 D1-1 for XLPE

insulated cableor AEIC CS-6 D1-1 forEPR insulated cable

31. The maximum thickness ofthe extruded insulationscreen

mm 2.159

32. The minimum thickness ofthe insulation screen

mm 1.016

33. Volume resistivity of

insulation screen at 90C

and 110C

-m 500

34. The outer surface of theinsulation screen should becontinuously printed withcontrasting colored inktitle :

LOP BAN DAN :LOAI BO KHI LAM

HOP NOI -ATTENTION :

REMOVE WHENCONNECTING.

5. Metallic shield :35. The extruded shield should

be spirally covered with onecontinuous bare coppertape

Yes

36. Thickness of bare coppertape

mm 0.127

37. Nominal overlap of coppertape

12.5 %.

6. Binder tape :

38. A layer of non-metallic tapeshall be lapped on themetallic shield.

Yes


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7. Oversheath :39. Oversheath should be an

extruded layer polyethylene (PE)40. Oversheath must contain a

termite repellent additiveYes

41. The thicness of Oversheath mm 2.7942. The minimum thickness at

anypoint of Oversheath

80 % of thethicness ofOversheath

43. 8. Cable identification :The following identifyinglegend should be repeatedlyembossed on the outer

surface of the PEoversheath at one meterintervals:- Type of cable : 24 KVXLPE (EPR) / PE 1C - CU -500mm2.- Manufacturer's name :- Year of manufacture :

Yes

Yes

YesYes

9. Metre marking of cable :44. Cable length should be

sequentially markednumerically at 1m intervals. The metre marking shouldbe limited to six digits andany drum length may startat any integral number .

The height of the numbershould be not less than 5mm .

Yes

45. The cable should be woundon the drum with the lowest

number at the drum outerend

Yes

10. Length of cable perdrum :

46. Length of cable per drum : Tenderer shall offerclearly the lengthand dimension of

drum.47. Maximum outside diameter

of cable drumm 2.5

48. Maximum width of cabledrum

m 1.4

49. The central hole of the Yes


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cable drum shall bereinforced with a steel plateof thickness not less than

10mm to fit for an axle size95mm diameter

50. 11. Continuous current A 640The above

continuous currentshall be calculatedat the followingconditions :

- Installation : Direct

burial under ground,flat form.- Ground

temperature : 15C- Maximumconductor

temperature : 90C- Thermal resistivity

of soil : 1.2Cm/W- Depth of burialcable : 0.8m

51. 12. Short time withstandcurrent:

The cable mustwithstand the shortcircuit current of70KA for one secondwithout damage(based on initialtemperature of conductor of 90Cand finaltemperature of

250C for copper

screen)

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Cap Ngam 24KV-1x500mm2