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2. The ultra-low frequency test device is composed of operation control and high voltage power supply, on-site operation is light and convenient, there is no "breaking" effect on the cable, and it can be used as a test method for rubber cables. The current technical limitations make it mainly used for less than or equal to 35kV. The cable test.
3, frequency conversion resonance test device consists of variable frequency power supply, excitation transformer, resonant reactor, voltage divider, less than or equal to 35kV cable using this method is more troublesome on-site operation, greater than or equal to 66kV cable can use this method as a field test method .
4. For cables larger than or equal to 110kV, the oscillating voltage method is small in size and convenient for on-site operation, but whether it can have the effect of ultra-low frequency and frequency conversion resonance test has yet to be verified.
5, partial discharge test can only detect the special part of the cable (intermediate connector, terminal, etc.), for the cable greater than or equal to 110kV, it is necessary to carry out this test on site.
6. The dielectric loss measurement method is almost useless in the field because of its own limitations.
Several test methods for rubber cable cables
1. The DC voltage withstand test for rubber cables can only find that the insulation of the general rubber cable cable has been significantly deteriorated or broken down. Because the cable has a “damaging†effect, it is used only when it is absolutely necessary and is for reference only.
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