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  • POWERGUARD

    Powerguard Testing Recommendations                                                                                          
    June 7, 2016


    Regarding field testing cables for commissioning, we recommend the VLF Testing in Accordance to IEEE 400: IEEE Guide for Field Testing and Evaluation of the Insulation of Shielded Power Cable Systems in accordance to Table 1 IEEE400.2 VLF Test Voltage Levels for Sinusoidal, Cosine-Rectangular. Voltage Peak
    values are shown in brackets for Cosine-Rectangular and Squarewave.

    The most important application part of the new IEEE400.2 cable testing guide is the Table 1 below that shows the recommended VLF Hipot voltage testing levels for the various medium voltage cable ratings for both new (Acceptance and Installation Testing) and old (Maintenance Testing) cable installations.

    This is a Pass/Fail type test, the cable either withstands the specified test voltage or it does not.
    The IEEE400 defines types of field tests:

    Installation Test
    This test is conducted after the installation of the cable but before the installation ofaccessories like the splices and terminations. Its purpose is to detect any transport, manufacturing, storage or installation defects.

    Acceptance Test
    This test is performed after the installation of the accessories, but before energization ofthe cable. It checks for installation defects of the complete cable system, as well as defects as a result of shipping, manufacturing or storage.

    Test Frequency
    VLF test frequency is 0.1Hz of a testing of 30 minutes.

    Cable Rating
    phase to phase
    (RMS)
       Installation Test
    phase to ground
      Acceptance Test
    phase to ground
    Maintenance
    Test

    phase to ground
    kV rms  kV rms
    (or peak) 
    kV rms
    (or peak) 
    kV rms
    (or peak)
    5 9 (13)  10 (14)  7 (10)
    8 11 (16)  13 (18)  10 (14)
    15 18 (25)  20 (28)  16 (22)
    25 27 (38)  31 (44)  23 (33)
    35 39 (55)  44 (62)  33 (47)

     

     

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