On-line fault distance measurement method for high-voltage cable
A technology for fault location and high-voltage cables, which is applied in the direction of fault location, measuring electricity, and measuring devices, and can solve the problems of not considering the influence of traveling wave velocity of cable operating parameters and low ranging accuracy
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[0085] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0086] Such as figure 1 As shown, a high-voltage cable online fault location method includes the following steps:
[0087] (1) Signal collection: collect transient traveling wave current signals at the beginning and end of the cable;
[0088] (2) Phase-to-mode transformation: convert the current signal in step (1) into 6 mutually independent modulus current signals through phase-to-mode transformation 1 ~i 6 ;
[0089] (3) Decomposition and reconstruction of transient traveling waves: select the modulus current signal i in step (2) 4 Carry out wavelet packet decomposition, use the wavelet packet decomposition coefficient to obtain the energy ratio of each frequency band, and then extract the frequency band with an energy percentage >5% to reconstruct the transient traveling wave; through the decomposition and reconstruction of the transi...
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