How to deal with special situations of cable fault testers?

Cable fault tester is a very useful tool in the power industry, which can help engineers quickly locate cable faults and improve maintenance efficiency. However, in practical use, we often encounter some special situations, such as high resistance grounding faults, flashover faults, etc., which can bring certain challenges to testing. This article will share some experience in using cable fault testers and explore how to respond to these special situations.

Handling methods for special situations

In cable fault testing, we often encounter some special situations, such as high resistance grounding faults, flashover faults, etc. These situations can pose certain challenges to testing, but through some methods, we can effectively address these special situations.

① High resistance grounding fault

High resistance grounding fault refers to a fault where the grounding resistance is greater than 100 Ω. In this case, the output voltage of the tester will be relatively low, making it difficult to trigger the reflected signal.

Solution: Increase the output voltage by increasing the test voltage, thereby triggering the reflection signal. In addition, the sensitivity of the test can also be improved by increasing the pulse width.

② Flashover fault

Flashover fault refers to the fault point inside the cable, which only occurs under high voltage. In this case, it is difficult for the tester to capture the reflected signal of the fault point.

Solution: Use multiple triggers to repeatedly send pulse signals until the reflection signal of the fault point is captured. In addition, the sensitivity of the test can also be increased by increasing the test voltage or reducing the pulse width.

Cable fault testers are very useful tools in the power industry. By sharing usage experience and handling methods for special situations, we can better utilize cable fault testers and improve maintenance efficiency. When using a cable fault tester, we should understand the basic usage steps and master the methods to deal with special situations, in order to better solve the problem of cable faults.

ZC-705DN Cable fault locator is an easy operation device used to pinpoint the fault point. It integrated the function of acoustic magnetic synchronization method, the step voltage method, the magnetic field strength method to make the pinpointing accuracy.

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