Cable insulation monitoring method and system based on high-voltage power frequency and low-voltage ultralow frequency
A cable insulation and ultra-low frequency technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of inability to timely and accurately evaluate the aging state of cable insulation, achieve small amplitude, reduce measurement errors, and facilitate detection Effect
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[0063] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0064] Such as figure 1 As shown, a cable insulation monitoring method based on high-voltage power frequency and low-voltage ultra-low frequency includes the following steps:
[0065] (1) In a power grid composed of multiple cable lines, couple low-voltage ultra-low frequency signals to cable lines where low-voltage ultra-low frequency signals do not exist;
[0066] (2) Collect the zero-sequen...
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