30kV VLF Testing Equipment for 10kV Cross-linked Power Cable

30kV VLF Testing Equipment for 10kV Cross-linked Power Cable

Technical Index of 30KV VLF Testing Equipment

1) Accuracy: ± (3% of full scale +0.5 KV)

2) Voltage waveform distortion:≤5%

3) Condition of use:  indoor, outdoor; temperature:  -10℃∽+40℃; humidity: ≤85%RH

4) Power supply: AC 50 Hz,220V ±5%

How to conduct  AC withstand voltage on power cables using 30KV VLF Testing Equipment ?

1)Please make sure that all the connection equipment of test products is divest from the cable of test products.

2)Separately cable insulation resistance test by 10000V Megger test items and recorded the test values.

3)Test voltage peaking values:Ｕmax＝３Ｕo,Ｕo is rated working voltage between cable conductor-to-ground or metal shield ,for examples, rated voltage 10KV cable, single-phase rated voltage Ｕo:

Uo＝10/√3KV

Voltage peaking values of test is :Umax＝3Uo

＝3*10/√3KV

＝√3*10KV

＝17.32KV

4)Test times:3 minutes .

5)Test separately . cable capacitor values of test products is within the instrument loading capability . pressure test can operation at the same times by cable three–phase lines in parallel .

6)Connecting the instrument with the test products’ cable by special flexible connecting cable ( accessory ) according to wiring diagram. Power on the instrument and finished setting the test frequency , times ,voltage, over-voltage protection values in the high-pressure sides,over current protection values then start boost test . Please pay attention to the high-pressure feedback circuit and checking if there are un-normal sounds in the cable of test products . You can record test times and test voltage when boost to test voltage .

7)The instrument will showdownautomotive if the test times finished and the products pass the pressure test if there are disruptive discharge happened .

8)Please stop the instrument boost ,power off the machines if there are some problems such as current un-normal enlarge ,voltage instability , unusual smell , smoke or noise or flash branding phenomena in the test products cables happened in the boost and pressure procedure .then checking it . the pressure test is failure if it is by the cable insulation weak part of test items . you can retest it if you confirm it is by the humidity or dirty surface .

9)Please do the pressure test again if the instrument is over current protection by the reasons except the cable insulation defects.

What is the significance of conducting AC withstand voltage on power cables?

1) The AC withstand voltage test of cables can detect hidden faults in cables in advance, reduce the frequency of cable failures during operation, and lower the risk of sudden power outages caused by cable failures.

2) To avoid unsuccessful power transmission and ensure a successful first power transmission.

3) Planned power outage maintenance and AC withstand voltage testing can reduce the frequency of temporary repairs and improve power supply reliability. So there should be an annual power outage maintenance plan for power cables.

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