Commissioning and Test Procedure of Power Cable and Equipment



Commissioning and Test Procedure:

Testing methods for power cable insulation depend basically on type and material of cable insulation. Cross-linked Polyethylene (XLPE) is now spreading widely for power cable insulation at the rated voltage of 66 to 500 kV world-wide.

Quick and easy understanding for commissioning test for transmission line and major equipment. Here specially focused on underground power transmission line, underground cable megger testing, cable fault location and main causes of cable fault, some manufacturing fault. You also find some megger test procedure for transformer or circuit breaker or common methods for insulation test or megger test.   

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Typical Electrical Test for Power Cable

01. Resistance measurements through bolted connections with a low-resistance ohmmeter;

02. Insulation-resistance test individually on each conductor with all other conductors and shields grounded. Apply voltage in accordance with manufacturer’s published data;

03. Shield-continuity test on each power cable;


04. In accordance with ICEA, IEC, IEEE and other power cable consensus standards, testing can be performed by means of direct current, power frequency alternating current, or very low frequency alternating current. These sources may be used to perform insulation-withstand tests, and baseline diagnostic tests such as partial discharge analysis, and power factor or dissipation factor.


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