How to check for underground cable faults?

How to check for underground cable faults?

Finding buried cable faults is divided into 6 steps: 1. Determine the nature of the faulty cable; 2. Test the cable length; 3. Select the test method; 4. Find out the direction of the cable; 5. Accurately locate the fault point; 6. Analyze the test results .

1. Analyze the nature of cable faults and understand the type of faulty cables;

Different types of cable faults should be tested in different ways, and cables with different media have different test speeds. Cables with different withstand voltage levels have different withstand voltage requirements.

2. Use the low-voltage pulse method of the host to test the length of the cable and check the transmission speed of the cable;

The full length of the test cable can let us know more about the specific situation of the faulty cable, can judge whether it is a high-resistance or low-resistance fault, and can judge whether the inherent radio wave speed is accurate (accurate radio wave transmission speed is the guarantee for improving the test accuracy. When the speed is inaccurate When the speed can be reversed) these can be solved by the low-voltage pulse test method.

3. select the appropriate test method;

Use the mainframe of the cable fault tester to perform rough measurement of cable faults; low-resistance faults are measured by low-voltage pulse method, and high-resistance faults are measured by high-voltage flashover method.

4. Use the path meter to detect the direction of the buried cable;

Before setting the point, you must know the path of the cable. If the path is known, this step can be omitted.

5. Accurately locate the fault point with a pointing instrument;

Connect the high-voltage equipment according to the fixed-point discharge method, and determine the degree of boosting according to the nature of the cable and the withstand voltage level of the cable. Accurate detection of cable fault points.

6. Carry out error analysis on the cable fault test results, and make a record of the completion of the test.

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Underground Cable Tester, Wire Tester Portable Locator Wire Tracker , Detecting Wall and Underground Cables, Electrical Lines, Gas and Water Supply Pipeline Path

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• Detecting cables, electrical lines-water/gas supply pipelines buried in wall or earth

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