Application

Medium and High voltage cables are used for overhead transportation of electricity, buried transportation of electricity, and submarine transportation of electricity.

Standard

IEC 60228; IEC 60502; IEC 60840; IEC 62067

Construction

1. Conductor: Copper conductor, water blocked.

2. Conductor Screening: Extruded semi-conductive compound.

3. Insulation: XLPE.

4. Insulation Screening: extruded semi-conductive compound.

5. Separator: Swelling tape.

6. Core Sheath1: Lead Sheath.

7. Core Sheath2: Semi-conductive PE sheath.

8. Fillers: Polypropylene filler.

9. Fibre-optic Element: Fibre optic cable.

10. Separator: Binder tapes

11. Bedding: Bedding layer.

12. Armour: Galvanized steel wires filled with bitumen compound.

13. Serving: Polypropylene yarn.

Cable Selection

The main difference between medium and high voltage cables and general low voltage cables is their perfect shielding structure.

That is, it has two shielding structures conductor shielding and insulation shielding.

These two shielding layers are very closely related to the cable accessories.

Wire and Cable are Classified According to Voltage Levels.

Low-voltage cables 0.6/1kV
Medium-voltage cables 3-35kV
High voltage cables 35-110kv
and ultra-high voltage cables 110-750kV

Low-voltage cables use ordinary PVC cables, polyethylene cables, and cross-linked polyethylene cables.
And the medium and high voltage cables are all cross-linked cables.
The 6kv-35kv ones are produced using three-layer co-extruded, high-density cross-linked polyethylene.
Common cable models are VV cable, YJV cable, VV22 cable, VV23 cable, YJV22 cable, and YJV23 cable.

The principles of selecting high, medium, and low voltage cables

The general principles for selecting cable cross-section, in order to achieve safety, reliability, economy, and technical reasonableness in power supply, the conductor cross-section should be determined according to the following principles.

(1) According to the long time allowable load current selection of wire cross-section.
Make the wire work under the maximum load for a long time without overheating, that is, not to exceed its long-time allowable temperature.

(2) According to the allowable voltage loss select the cross-section of the wire.
So that the receiving end has sufficient voltage to ensure the quality of the power supply.

(3) Select the wire cross-section according to the economic current density.
So that the annual operating cost of the transmission line is the lowest, to achieve the purpose of economic power supply.

(4) Select the cross-section of the wire according to the mechanical strength.
Avoid breakage during operation or installation, or damage due to smashing pressure to ensure the safe operation of the power supply.

(5) Select the wire cross-section according to the thermal stability of the short-circuit conditions.
When the wire through the short-circuit current does not exceed its short-time allowable temperature.

Electrical Data

6/10(12)KV

Nominal Cross Section Area	Capacitance	Inductance	Current Rating
mm²	μF/mm	mH/km	A
35	0.23	0.43	167
50	0.26	0.41	199
70	0.29	0.38	241
95	0.32	0.37	288
120	0.35	0.35	327
150	0.38	0.34	363
185	0.42	0.33	405
240	0.47	0.32	464

12/20(24)KV

Nominal Cross Section Area	Capacitance	Inductance	Current Rating
mm²	μF/mm	mH/km	A
35	0.17	0.47	171
50	0.18	0.44	199
70	0.2	0.41	243
95	0.22	0.4	292
120	0.24	0.38	328
150	0.26	0.37	364
185	0.28	0.35	408
240	0.31	0.34	467

26/45(52)KV

Nominal Cross Section Area	Capacitance	Inductance	Current Rating
mm²	μF/mm	mH/km	A
95	0.18	0.43	1.5
120	0.19	0.42	1.6
150	0.21	0.4	1.6
185	0.22	0.39	1.8
240	0.24	0.37	2
300	0.26	0.36	2.2
400	0.29	0.35	2.3
500	0.32	0.33	2.6
630	0.35	0.32	2.9
800	0.38	0.31	3.1
1000	0.42	0.3	3.5

38/66(72.5)KV

Nominal Cross Section Area	Capacitance	Inductance	Current Rating
mm²	μF/mm	mH/km	A
95	0.17	0.44	2
120	0.18	0.43	2.1
150	0.19	0.41	2.3
185	0.2	0.4	2.4
240	0.22	0.38	2.6
300	0.24	0.37	2.8
400	0.26	0.35	3.1
500	0.29	0.34	3.5
630	0.32	0.33	3.7
800	0.35	0.32	4.1
1000	0.38	0.31	4.6

64/110(123)KV

Nominal Cross Section Area	Capacitance	Inductance	Current Rating
mm²	μF/mm	mH/km	A
185	0.14	0.46	2.8
240	0.15	0.43	3
300	0.17	0.41	3.5
400	0.2	0.38	3.9
500	0.22	0.37	4.3
630	0.24	0.36	4.7
800	0.26	0.34	5.2
1000	0.28	0.33	5.6

76/132(145)KV

Nominal Cross Section Area	Capacitance	Inductance	Current Rating
mm²	μF/mm	mH/km	A
185	0.13	0.47	3
240	0.14	0.44	3.4
300	0.16	0.42	3.8
400	0.18	0.4	4.3
500	0.2	0.38	4.6
630	0.21	0.37	5.1
800	0.23	0.36	5.6
1000	0.25	0.35	6.1

87/150(170)KV

Nominal Cross Section Area	Capacitance	Inductance	Current Rating
mm²	μF/mm	mH/km	A
240	0.13	0.47	3.4
300	0.14	0.44	3.7
400	0.15	0.42	4.1
500	0.17	0.4	4.7
630	0.19	0.38	5.3
800	0.21	0.37	5.7
1000	0.23	0.36	6.3

127/220(245)KV

Nominal Cross Section Area	Capacitance	Inductance	Current Rating
mm²	μF/mm	mH/km	A
500	0.14	0.43	5.7
630	0.16	0.41	6.4
800	0.17	0.4	6.9
1000	0.19	0.38	7.4

160/275(300)KV

Nominal Cross Section Area	Capacitance	Inductance	Current Rating
mm²	μF/mm	mH/km	A
500	0.14	0.44	6.8
630	0.16	0.42	7.7
800	0.17	0.4	8.3
1000	0.18	0.39	9

Dimension and Weight

26/45(52)KV

Nominal Cross Section Area	Nominal Conductor Diameter	Nominal Insulation Thickness	Nominal Diameter Over Insulation	Nominal Lead Sheath Thickness	Nominal Overall Diameter	Weight
mm²	mm	mm	mm	mm	mm	kg/m
95	11.2	8	29.6	1.3	109	20.8
120	12.6	8	31	1.3	112	22.3
150	14.2	8	32.6	1.4	116	24.4
185	15.8	8	34.2	1.4	119	26.2
240	18.1	8	36.5	1.5	124	29.5
300	20.4	8	38.8	1.6	130	32.9
400	23.2	8	41.6	1.7	136	37.9
500	26.2	8	45	1.8	144	43.2
630	29.8	8	48.6	1.9	152	49.7
800	33.7	8	52.5	2.1	162	58.6
1000	37.9	8	57.3	2.2	173	68.1

38/66(72.5)KV

Nominal Cross Section Area	Nominal Conductor Diameter	Nominal Insulation Thickness	Nominal Diameter Over Insulation	Nominal Lead Sheath Thickness	Nominal Overall Diameter	Weight
mm²	mm	mm	mm	mm	mm	kg/m
95	11.2	9	31.6	1.3	113	21.6
120	12.6	9	33	1.4	116	23.8
150	14.2	9	34.6	1.4	120	25.7
185	15.8	9	36.2	1.4	124	28
240	18.1	9	38.5	1.6	129	31.3
300	20.4	9	40.8	1.6	134	34.3
400	23.2	9	43.6	1.7	141	39.2
500	26.2	9	47	1.9	149	45.4
630	29.8	9	50.6	2	157	52
800	33.7	9	54.5	2.1	167	60.1
1000	37.9	9	59.3	2.3	178	70.7

64/110(123)KV

Nominal Cross Section Area	Nominal Conductor Diameter	Nominal Insulation Thickness	Nominal Diameter Over Insulation	Nominal Lead Sheath Thickness	Nominal Overall Diameter	Weight
mm²	mm	mm	mm	mm	mm	kg/m
185	15.8	16	50.2	2	156	40.9
240	18.1	15	50.5	2	157	42.5
300	20.4	14	50.8	2	157	44.1
400	23.2	13	51.6	2	159	47.2
500	26.2	13	55	2.1	167	53
630	29.8	13	58.6	2.3	176	60.7
800	33.7	13	62.5	2.4	185	69.5
1000	37.9	13	67.3	2.6	197	80.5

76/132(145)KV

Nominal Cross Section Area	Nominal Conductor Diameter	Nominal Insulation Thickness	Nominal Diameter Over Insulation	Nominal Lead Sheath Thickness	Nominal Overall Diameter	Weight
mm²	mm	mm	mm	mm	mm	kg/m
185	15.8	18	54.2	2.1	165	44.9
240	18.1	17	54.5	2.1	166	46.3
300	20.4	16	54.8	2.1	167	48
400	23.2	15	55.6	2.1	168	51.1
500	26.2	15	59	2.3	176	58
630	29.8	15	62.6	2.4	185	65.2
800	33.7	15	66.5	2.5	194	74
1000	37.9	15	71.3	2.7	206	85.4

87/150(170)KV

Nominal Cross Section Area	Nominal Conductor Diameter	Nominal Insulation Thickness	Nominal Diameter Over Insulation	Nominal Lead Sheath Thickness	Nominal Overall Diameter	Weight
mm²	mm	mm	mm	mm	mm	kg/m
240	18.1	21	62.5	2.4	184	55.5
300	20.4	20	62.8	2.4	185	57.3
400	23.2	19	63.6	2.4	187	60.5
500	26.2	18	65	2.5	190	65.1
630	29.8	17	66.6	2.5	194	69.7
800	33.7	17	70.5	2.7	204	79.8
1000	37.9	17	75.3	2.8	215	90.5

127/220(245)KV

Nominal Cross Section Area	Nominal Conductor Diameter	Nominal Insulation Thickness	Nominal Diameter Over Insulation	Nominal Lead Sheath Thickness	Nominal Overall Diameter	Weight
mm²	mm	mm	mm	mm	mm	kg/m
500	26.2	24	77.6	2.9	219	81.3
630	29.8	23	79.2	3	224	86.7
800	33.7	23	83.1	3.1	234	95.3
1000	37.9	23	87.3	3.1	241	104

160/275(300)KV

Nominal Cross Section Area	Nominal Conductor Diameter	Nominal Insulation Thickness	Nominal Diameter Over Insulation	Nominal Lead Sheath Thickness	Nominal Overall Diameter	Weight
mm²	mm	mm	mm	mm	mm	kg/m
500	26.2	26	81.6	2.9	229	84.7
630	29.8	24	81.2	3	228	88.9
800	33.7	24	85.1	3.1	237	97.6
1000	37.9	24	89.3	3.1	247	106.3

Power Cable

Power cables are used to transmit and distribute electrical energy. Power cables are commonly used in urban underground power grids, power station lead-out lines, power supply within industrial and mining enterprises, and over-the-river transmission lines.

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CORPORATE SOCIAL RESPONSIBILITY

ZMS Cable have a wide product scope, includes: Power cables up to 500kV, AAC, AAAC, ACSR conductors, ABC Cable,electric wires, instrument cable, telecommunications cable, Stay wires. With advanced manufacture technology, rich human resource and effective management system, we guarantee all products are manufactured strictly in accordance with GB, IEC, BS, NFC, ASTM, DIN standards,etc. Beyond quality control, ZMS have been trying its best to offer much higher standard of services rather than expected.

The Adjuster: All customised cables designed by our cable engineer will be subject to testing to relevant standards and appropriate performance criteria. Bespoke cable testing will be conducted under our CNAS accreditation where appropriate. Where required by industry or application, we can submit for relevant cable certification and cable approval processes. For more information or to discuss possible custom designed cable solutions, please complete an enquiry form, contact our technical experts on the Technical Hotline +86 (0)371 6782 9333, or email:sales@zmscable.com; Case Studies