How to correctly identify false breakdowns in medium voltage cross-linked cables

Medium-voltage cross-linked power cables factory partial discharge and high-voltage test is carried out in the shielded room disk by disk, then you can consider re-replacing the insulated wire core for retesting, if the replacement of the core, the voltage test is normal through, it should be possible to determine that the cable is really occurring breakdown. Or, re-boosting, if the breakdown voltage shows a trend of gradual reduction, you can also determine the cable occurred in the true breakdown phenomenon, if the cable each time the breakdown voltage is in the same value, you should consider whether the cable end of the breakdown, at this time, you can partial discharge shielding room door chain switch, artificially closed, the shielding room door is open, the voltage, observation of the breakdown phenomenon, and will soon be able to Determine the location of the end breakdown. If after investigation, the cable end does not appear to breakdown, replacement of multiple insulated cores and cables, and even had been made qualified cable retest or no-load retest, the breakdown voltage always maintains the same value, should be able to confirm that when the cable appeared to be a false breakdown phenomenon, should be inspected for equipment, troubleshooting and then test. But for some of the large length of single-core medium-voltage crosslinked cables, should also check whether it has exceeded the permissible load of the test equipment, such a situation, the test process will also be detuned trip phenomenon, do not take the risk of determining that the cable breaks down.

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