In-cabinet cable head fault positioning method and system based on phase CT and zero sequence CT
A technology of fault location and cable head, which is applied in the direction of fault location, information technology support system, fault detection according to conductor type, etc., can solve problems such as inability to locate, achieve improved safety and reliability, high correct rate of line selection, and reduce Effects on personal injury
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Embodiment 1
[0070] like figure 1 , a method for locating cable head faults in a cabinet based on phase CT and zero-sequence CT, including steps 1 to 4.
[0071] Step 1: Collect the neutral point zero-sequence voltage of the distribution network, the synthetic zero-sequence current of the three-phase CT, and the zero-sequence current of the zero-sequence CT.
[0072] Preferably, in step 1, the real-time sampling frequency of each electrical quantity in the distribution network is not lower than 12 kHz.
[0073] Preferably, in step 1, for any line, the currents of the three-phase CTs are added to obtain the combined zero-sequence current of the line.
[0074] Step 2, according to the real-time mutation and real-time amplitude of the neutral point zero-sequence voltage, determine whether a single-phase ground fault occurs in the system.
[0075] Preferably, in step 2, when at least one of the following two conditions is met, it is determined that there is a single-phase ground fault:
[0...
Embodiment 2
[0108] Embodiment 2 of the present invention establishes in ATP simulation software such as figure 2 The 10kV simulation model shown, the transition resistance is 80Ω, the synthetic zero-sequence current of phase CT and the zero-sequence current signal of zero-sequence CT are obtained when the fault occurs at different positions.
[0109] The parameters of each line and fault transition resistance are shown in Table 1 below:
[0110] Table 1 Line parameters
[0111]
[0112] When a fault occurs on the busbar, such as figure 1 For fault 1 shown, the combined zero-sequence current of the three-phase CTs on each line is as follows: image 3 shown. The combined zero-sequence current waveforms of lines 1 to 4 are similar, and the combined zero-sequence current value gradually decreases as the distance between the line and the bus fault point increases. Depend on image 3 It can be seen that the synthetic zero-sequence current signal of the three-phase CT shows that no faul...
Embodiment 3
[0133] Cable head fault location system in cabinet based on phase CT and zero-sequence CT, including: electrical quantity acquisition module and single-phase ground fault location device;
[0134] The electrical quantity acquisition module is used to collect the neutral point zero-sequence voltage of the distribution network, the three-phase current and zero-sequence current of each line in the distribution network in real time with a sampling frequency of not less than 12kHz; the electrical quantity acquisition module, the The neutral point zero-sequence voltage of the distribution network, the three-phase current and zero-sequence current of each line in the distribution network are all input to the single-phase grounding fault location device;
[0135] The fault location results output by the fault location module include: cable line fault, busbar fault, and cable head fault in the switch cabinet of the line.
[0136] The electrical quantity acquisition module includes: neu...
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