Partial Discharge Detection for Cables

1. Cable Testing Requirements and Preparations Before Testing

1）Prior to partial discharge testing, disconnect and ground the cable, leaving both ends suspended, and set up the safety perimeter.

2) Aim to minimize the cable joint areaPTRemoval of lightning arresters and other equipment.

3) Ensure the cable ends are clean and maintain adequate insulation distance between the cable ends and the surrounding grounding areas.

4) Collect cable parameters such as length, model, type, and commissioning date.

5) Cable Length L: Measurement method on one side of the cable: 50m ≤ L ≤ 3km;

Measurement Method at Both Ends of the Cable:L＞3km。

2. Insulation Resistance Testing

The main insulation resistance test of the 10kV cable was conducted using a 2500V insulation megger. The insulation resistance should show no significant change before and after the test. For the main insulation resistance test of the 10kV cable, the insulation resistance must be greater than 50MΩ to proceed to the next phase of testing.

3. Test the intermediate joint position of the cable and the cable length

AdoptSEBAKMT Easyflex ComMultifunctional Pulse Reflectometer (as shown in the figure)2) The entire cable length and intermediate joint positions were tested to measure cable length and joint locations, as well as to pre-position for cable short-circuit and open-circuit faults.

Testing Requirements:

The full length of the cable must be accurate for calibration purposes.

2) Ensure intermediate joint measurements are as accurate and detailed as possible, which aids in final determination of partial discharge locations.

3) Measurement Range:50m～15000mThe measuring range needs to be adjusted according to the cable length.