Grey Silane XLPE Compound for 10KV and Below Aerial Hanging Cable with Monosil Method

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Product Description:

Description

Grade 4255G is silane XLPE compound with monosil method (one step), it is specially used for 10kv below aerial hanging power cable, it is composed by selected PE resin, gray anti-ageing masterbatch and other additives. The product’s major characteristics are

◆Outstanding anti-ageing property

◆Outstanding electrical property

◆Simple processing technique

Standard

After crosslinked in the tepid water, the cable made from the product grade 4255G can comply with the standard of IEC60502-2004, GB/T14049-2008

Main Properties & Typical Values

Test Items

Unit

Test Method

Standard

Typical value

Tensile strength

MPa

GB/T1040.3

≥13.5

18.5

Elongation at break

%

GB/T1040.3

≥300

460

Heat ageing properties (Test temperature 135℃, 168hr)

Maximum tensile strength change      

Maximum elongation at break change

%

%

GB/T8815

±20

±20

7.2

7.5

Heat elongation (200±3)℃x15minx0.2MPa)

Maximum elongation change under load      

Maximum permanent elongation change after cooled

%

%

GB/T2951

≤80

≤5

60

2

Impact brittle temp. (-76℃)  

Impact brittle

Failure no.

GB/T5470

≤15/30

Pass*

Dielectric Strength

MV/m

GB/T1408.1

≥30

40*

Dielectric loss factor 50Hz, 20℃

--

GB/T1409

≤1×10-4

2×10-4*

Dielectric constant 50Hz, 20℃

--

GB/T1409

≤2.35

2.2*

Volume resistance (20℃)

Ω·m

GB/T1410

≥1.0×1014

6×1014*

Pressure crack test F50

hr

GB/T2951

1000

Pass*

Artificial atmosphere ageing properties:

Ageing After 42days,

Maximum tensile strength change      

Maximum elongation at break change

Ageing after 42days vs. after 21days

Maximum tensile strength change      

Maximum elongation at break change

%

%

%

%

GB/T14049

±30

±30

±15

±15

-18

-20

-10

-9

Typical values were tested onthe sample strip by squeezing film extrusion and be boiled in hot water at 90℃ for four hours.

*Especially, these typical values were tested by press moulding sample (A and B mixed at percentage of 90:10), under the condition of 180±2 ℃, 15min, and pressure over 15Mpa, then boiled in 90℃ water for four hours.

Recommended Processing Technique

1.   Extrusion Equipment

Most extruders for PVC and PE suit for 4255G

The recommended equipment and processing technique is as following.

Ratio of length and diameter                    18—25:1

Diameter                                                45—120mm

Ratio of compressing                              1.5—3.5

Ratio of elongation                                  1:1.0—1:1.5

Filtering mesh                                         40/60/40

2.   Extruder processing temperature and other related settings

Temperature Setting:  Specific processing temperature should be based on different equipment and pressing conditions, reference settings are as following:

Feeding Section(℃)

Compression Section(℃)

Measurement Section

(℃)

Die head and Mould

(℃)

140~155

155~175

175~195

195~205


Die head setting:
Tubing extrusion style is recommended.

   

3.   Crosslink

After extrusion and cooling, the cable can be crosslinked by immersed in hot water (90℃) or exposed in low pressure vapour. The time required for crosslink is based on the thickness of the insulation and the coil size, the thicker the insulation and the greater the coil size, the longer the crosslink time required. The crosslink time can be calculated according to the equation of 4hr/mm for 90℃.


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