Medium Voltage Cable Cu/XLPE/CTS/STA/PVC

Introduction

This cable is used to transmit power on the power transmission and distribution line of A.C.50Hz, rated voltage 36kV or lower. They are suitable for installations indoors: mostly in power supply stations and outdoors: in cable ducts, underground, and on cable trays for industries, switch-boards and power stations.

Executive standard

IEC60502-2 Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um = 1,2 kV) up to 30 kV (Um = 36 kV)
Part 2: Cables for rated voltages from 6 kV (Um = 7,2 kV) up to 30 kV (Um = 36 kV)

Instruction of application

Rated Voltage:

● 3.6/6 (7.2) kV

● 6.0/10(12) kV

● 8.7/15(17.5) kV

● 12/20(24) kV

● 18/30(36) kV

The ambient temperature for cable installation :≥0 ⁰C

This minimum working temperature of the cable is -20 ⁰C

This maximum working temperature of the conductor is 90 ⁰C;

During having a short (lasting less than 5 seconds) the maximum temperature of the cable conductor shall not be above 250 ⁰C;

Bending radius allowance of the cable:

Type of cable	Minimum Bending Radius (mm)
	During Installation	Adjacent to joints or terminals
Single Core Cables	15D	12D
Three Core Cables	12D	10D

Cable Construction Description

Conductor
Class 2 stranded circular or circular compacted

Semi-Conductive Layer for Conductor
Semi-conductive material

Insulation
XLPE (Cross-Linked Polyethylene)

Semi-Conductive Layer for Insulation
Semi-conductive material

Metallic screen
Copper wires / Copper Tape / Copper Wire & Tape

Inner Sheath
PVC (Polyvinyl Chloride)

Amoured

STA- Steel Tape Amoured
Non-magnetic amoured material used for single core cable.

Outer Sheath

PVC (Polyvinyl Chloride)
The conductor Semi-Conductive Layer, XLPE insulation and the insulation Semi-Conductive Layer are extruded simultaneously in one process using triple extrusion method (Continuous Vulcanization Line). Triple extrusion method not only assures clean interfaces between the insulation and stress control layers, but also assures a construction free of Partial Discharge with high operational reliability.

The Main Technical Parameter Of The Cable
1） Cable conductor DC resistance: See the table 1-1
2） Partial discharge test： See the table 1-2
3） AC voltage test: See the table 1-3
4） Rated Voltage，Core Numbers & Nominal Cross-section Area : See the table1-4

Table 1-1 Max. DC resistance of cable conductor at 20 ⁰C

Rated cross area （mm2）		16	25	35	50	70	95	120	150
Cu （Ω/km）	Non tinned	1.15	0.727	0.524	0.387	0.268	0.193	0.153	0.124
	Tinned	1.16	0.734	0.529	0.391	0.270	0.195	0.154	0.126
Al （Ω/km）		1.91	1.20	0.868	0.641	0.443	0.320	0.253	0.206
Rated cross area （mm2）		185	240	300	400	500	630	800	1000
Cu  （Ω/km）	Non tinned	0.0991	0.0754	0.0601	0.0470	0.0366	0.0283	0.0221	0.0176
	Tinned	0.100	0.0762	0.0607	0.0475	0.0369	0.0286	0.0224	0.0177
Al （ Ω/km）		0.164	0.125	0.100	0.0778	0.0605	0.0469	0.0367	0.0291

Rated Voltage (kV)	3.6/6	6/6 6/10	8.7/10 8.7/15	12/20	18/30	21/35	26/35
Test Voltage （kV）	6.23	10.38	15.05	20.76	31.14	36.33	44.98
Discharge capacity （pC）	10	10	10	10	10	10	10

Rated Voltage kV	3.6/6 3.6/10	6/6 6/10	8.7/10 8.7/15	12/20	18/30	21/35	26/35
Test Voltage kV	12.5	21	30.5	42	63	73.5	91
Test Time min	5	5	5	5	5	5	5

U0/Um Area mm2		3.6/6	6/6 6/10	8.7/10 8.7/15	12/20	18/20 18/30	21/35	26/35
Core No.	1	25-630	25-630	35-630	35-630	50-630	50-630	50-630
	3	25-400	25-400	35-400	35-400	50-400	50-400	50-400