Testing of Electrical Power Cable | Type Test | Acceptance Test | Routine Test

1. The following tests are the type test of electrical power cable.

   Physical tests for insulation and sheath

1. Tensile strength and elongation at break

2. Aging in an air oven

3. Aging in air bomb

4. Aging in an oxygen bomb

5. Hot set

6. Oil resistance

7. Tear resistance

8. 
   

9. Insulation resistance

10. High voltage (water immersion) test

11. Flammability test (only for SE-3, SE-4)

12. Water abortion test (for insulation)

13. Persulphate test (for copper )

14. Annealing test (for copper)

15. Tensile test (for Aluminium)

16. Wrapping test (for Aluminium)

17. Conductor resistance test (for all)

18. Test for thickness of insulation (for all)

19. Measurement of overall diameter (where specified)(for all)

20. 
    

2. Acceptance test: The following shall constitute acceptance test:

1. Annealing test (for copper)

2. Tensile test (for Aluminium )

3. Wrapping test (for Aluminium )

4. Conductor resistance test

5. Test for the thickness of insulation and sheath and overall diameter

6. Tensile strength and elongation at break of insulation and heath

7. Hot set test for insulation and sheath

8. High voltage test

9. Insulation resistance test

3. Routine test: The following shall constitute the routine test.

1. Conductor resistance test

2. High voltage test

3. Insulation resistance test

High Voltage Test (Water Immersion Test) :
Approximate 3 meters long core is removed as a sample from the finished cable or cord. The sample then is so immersed in a water bath at room temperature that its ends protrude at least 200 mm above the water level. After 24 hours, an alternating voltage of the required level is applied between conductor and water. This voltage is raised as per requirement within 10 sec and hold constant at this value for 5 min. If the sample fails in this test, one more sample can be subjected to this test.

Test on completed cables (Acceptance and routine test) :
This test shall be carried out between conductors or between conductor and screen/armor. The test shall be carried out on required voltage the test shall be carried out at room temperature and the time of application shall be 5 min no failure of Insulation shall occur.

Flammability Test :
Period of burning after removal of the flame shall not exceed 60 sec and the unaffected portion from the lower edge of the top clamp shall be at least 50 mm.

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