EPDM Insulating rubber compound for medium voltage cable

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Product Description:

EPDM Insulating rubber compound for medium voltage cable

I.     Type and application

Type

Product

Application

XJ-34A

90 Insulation rubber compound for medium  voltage cable

Insulating  rubber compound for  630KV  flexible medium voltage cable

XJ-34B

90 Insulation rubber compound for  medium  voltage cable

Insulating  rubber compound for 6/10KV medium voltage cable

XJ-34C

90 Insulation rubber compound for  medium  voltage cable

Insulating  rubber compound for 8.7/15KV medium voltage cable

XJ-34D

90 Insulation rubber compound for  medium  voltage cable

Insulating  rubber compound for 10/20KV medium voltage cable

XJ-34E

90 Insulation rubber compound for  medium  voltage cable

Insulating  rubber compound for 26/35KV medium voltage cable

II.   Product description

XJseries  insulating rubber compound formedium voltage cable, based on EPDM rubber, is mixed with various additives,and is elaborated in the extra-clean conditions. Voltage grade of cable is from6kV to 30kV. The compound has outstanding performances of vulcanization, processing, physical,mechanical, aging and electrical properties. The compound is complied withQ/320585JSDT058-2003 standard.

III.  Processing

Processing Equipment

Compression ratio

L/D

Processing temp.

Recommended vulcanize temp.

Common rubber extruder

1.111.51

151201

60110

160-200℃

IV.   Maximum useful shelf life

12 months at 20℃, 6 months at 30℃.


V.     Properties

Table

Item

XJ-34 A

XJ-34B

XJ-34C

XJ-34D

XJ-34E

Standard

Typical

Standard

Typical

Standard

Typical

Standard

Typical

Standard

Typical

Tensile Strength N/mm2

≥7.0

10.9

≥8.5

11.0

≥8.5

9.4

≥8.5

11.5

≥8.5

11.0

Elongation at Break %

≥300

430

≥200

400

≥200

280

≥200

410

≥200

400

Oven aging

135168h

135168h

135168h

135168h

135168h

Variation on Tensile Strength  %

±15

+14

±30

+11

±30

+6.5

±30

+10.5

±30

+11

Variation on Elongation at Break %

±15

-3

±30

-4

±30

-7

±30

-8.5

±30

-7

Dielectric Loss Angular Tangent value

≤0.003

0.0019

≤0.003

0.0026

≤0.003

0.0025

≤0.003

0.0024

≤0.003

0.0020

Dielectric Constant  ε

≤2.8

2.60

≤2.8

2.65

≤2.8

2.64

≤2.8

2.62

≤2.8

2.60

Dielectric Strength MV/m

≥25

31.9

≥25

30

≥25

30

≥25

30

≥25

32

Air  bomb aging test  127℃40h

Tensile Strength  N/mm2

10.0

Variation    %

±15

-5

±30

-5

±30

-5

±30

-4

±30

-4

Elongation at Break  %

420

Variation     %

±15

-3

±30

-3

±30

-2

±30

0

±30

0

Hot Prolongation  15min20N/cm

250

250

250

250

250

Elongation Under Load %

≤100

25

≤175

50

≤175

50

≤175

50

≤175

50

Permanent Elongation after cooling  %

≤10

1

≤15

0

≤15

0

≤15

0

≤15

0

Volume Resistivity at20Ωm

1.0×1014

2.6×1014

1.0×1012

7.2×1013

1.0×1012

7.0×1013

1.0×1012

1.5×1014

1.0×1012

5.2×1014

Volume Resistivity at90Ωm

1

Elastic Modulus

At 150% Elongation /mm2

≥4.5

6.0

≥4.5

6.1

≥4.5

6.2

≥4.5

7.2

At 50% Elongation N/mm2

≤7.5

5.1

≤7.5

5.0

≤7.5

5.2

≤7.5

6.1

Capacitance variation after water  immersion  50±2℃

Between one day and seven days  %

≤15

6

≤15

5

≤15

5

≤15

5

Between seven days and fourteen days  %

≤5

1

≤5

1

≤5

1

≤5

1

Ozone Resistance

Ozone Concentration  2-3.33PPM

Surface Variation

Non cracking

Pass

Non cracking

Pass

Non cracking

Pass

Non cracking

Pass

Non cracking

Pass

Hardness IRHD

--

68

≥80

80

≥80

80

≥80

80

≥80

80

Density

--

1.21


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