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  • What is the voltage for VLF cable test?

    DerVLF cable tester under Wuhan UHV can help many power workers conduct various power tests more conveniently.


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    Core Voltage Parameters


    1.Base Standard:
    VLF testing applies 0.1 Hz AC high voltage at 2 to 3 times the cable’s rated voltage (U₀).
    Examples:
    10 kV rated cable → Test voltage: 22–28 kV (typically 28 kV).

    35 kV rated cable → Test voltage: 70–105 kV (commonly 52–65 kV, subject to standards).


    2.Calculation Basis:
    Formula: Test voltage = (2.0 ~ 3.0) × Rated Voltage (U₀).
    International Standards:
    IEEE 400.2: Mandates 2U₀ for 15 minutes or 3U₀ for 30 minutes.

    IEC 60502-2: Requires 3U₀ for new cables; diagnostic tests on aged cables may use 2U₀.


    3.Safety Limits:
    Never exceed 3U₀: Higher voltages risk damaging healthy insulation.

    XLPE Cable Protection: 0.1 Hz polarity reversal prevents space charge buildup, ensuring test safety.


    Special Scenario Adjustments


    Aged/Damaged Cables: Voltage may be reduced to 1.6U₀ (supported by tanδ diagnostics).
    Post-Repair Verification: 2U₀ for 15 minutes (per IEEE 400.2).
    Note: Actual voltages must align with cable type (XLPE/EPR/PILC), service age, and local standards (e.g., GB/T 12706.4).

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