Evaluation method of aging state of xlpe cable insulation water tree based on current offset coefficient
A cable insulation and current offset technology, which is applied in the directions of measuring electricity, measuring electrical variables, and testing dielectric strength, etc., can solve hidden dangers of safe and stable operation of power systems, convenient detection methods that have not been widely used, insulation breakdown accidents, etc. problems, achieve high economic and social significance, improve the utilization of equipment assets, and avoid insulation breakdown
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[0018] The present invention will be further described below with reference to the accompanying drawings and specific implementation processes.
[0019] figure 1 Shown is the flow chart of the method for evaluating the aging state of XLPE cable insulation water tree based on the current offset coefficient, which includes the following steps:
[0020] Step 1: Perform an ultra-low frequency differential frequency response current test on the XLPE cable:
[0021] The XLPE cable to be evaluated is connected to the difference frequency detection system, and two sinusoidal voltages with multiple frequencies are applied to it: First, the step-up method is used to apply the frequency voltage to the cable, starting from 0kV at a speed of 1kV / min. Then, adjust the amplitude and frequency of the low-voltage signal source, so that the voltage amplitude of the low-voltage superimposed source is 80V, and the frequency output is 100Hz (twice the power frequency), and the resulting ultra-low...
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