National standards and inspection standards for insulating tubes

Distribution room voltage: 10KV Choose 8mm thick; Power frequency withstand voltage test 10000V, no breakdown for 1 minute. In the power frequency withstand voltage test 18000V, breakdown in 20 seconds. Distribution room voltage: 35KV Choose 10-1……

Distribution room voltage: 10KV

Choose 8mm thick;

Power frequency withstand voltage test 10000V, no breakdown for 1 minute. In the power frequency withstand voltage test 18000V, breakdown in 20 seconds.

Distribution room voltage: 35KV

Choose 10-12mm thick;

Power frequency withstand voltage test 15000V, no breakdown for 1 minute. In the power frequency withstand voltage test 26000V, breakdown in 20 seconds.

Distribution room low voltage

Choose 5mm thick;

Below 500V

Power frequency withstand voltage test 3500V, 1 minute without breakdown. In the power frequency withstand voltage test 10000V, 20 seconds without breakdown!

Inspection standards

(taking 8mm insulating rubber sheet as an example)

  1. Appearance:

1) The depth and height of the smear does not exceed the tolerance of the thickness of the rubber sheet

2) Within the square meter, no more than 5 bubbles of less than 1cm2 in area, and the distance between any two bubbles is not less than 40mm.

3) The depth and length of the impurity shall not exceed 1/64 of the thickness of the rubber sheet. The edge is not uniform or the width of the sea surface is not more than 10 mm, and the length is not more than 1/105 of the total length of the rubber sheet.

  1. Hardness (Shore A): 55-703.

Tensile strength and elongation at break:

1) Tensile strength (Mpa) ≥ 5.0

2) Elongation at break ≥250%

  1. Fixed stretch (150%), permanent deformation ≤ 25%
  2. Hot air aging (70 ° C * 72h): tensile strength reduction rate ≤ 30%
  3. Water absorption ≤ 1.5%
  4. Electrical insulation performance test:

1) Withstand voltage test: 25KV (effective value), keep 1min, there should be no breakdown

2) Breakdown voltage test ≥35KV (effective value)

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