Small current fault line selection system based on piezoelectric ceramic voltage acquisition

A piezoelectric ceramics, fault line selection technology, applied in the field of electric power, can solve the problem of inability to accurately analyze and provide sufficient fault lines, and achieve the effect of reducing misjudgment

Pending Publication Date: 2018-06-22
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a small current fault line selection system based on piezoelectric ceramic voltage acquisition to solve the problem that the existing small current fault line selection device cannot provide sufficient data support for accurate analysis of fault lines

Method used

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  • Small current fault line selection system based on piezoelectric ceramic voltage acquisition
  • Small current fault line selection system based on piezoelectric ceramic voltage acquisition

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Embodiment Construction

[0021] see Figure 1 to Figure 2 , the embodiment of the present invention provides a small current fault line selection system based on piezoelectric ceramic voltage collection, including: power cable 1, zero-sequence current transformer 2, overhead wire 3, piezoelectric ceramic voltage transformer 4, waveform Recorder 6, small current fault line selection device 8 and processor 9.

[0022] Wherein, the power cable 1 includes an A-phase bus 11 , a B-phase bus 12 and a C-phase bus 13 , and in this embodiment, the power cable 1 is a three-phase four-wire transmission line. The overhead conductors 3 include a first overhead conductor 31 connected to the A-phase bus 11 , a second overhead conductor 32 connected to the B-phase bus 12 , and a third overhead conductor connected to the C-phase bus 13 33.

[0023] The piezoelectric ceramic voltage transformer 4 includes a first piezoelectric ceramic voltage transformer 41 , a second piezoelectric ceramic voltage transformer 42 and a...

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Abstract

The invention provides a small current fault line selection system based on piezoelectric ceramic voltage acquisition. The system comprises a power cable, a zero sequence current transformer, an overhead conductor, a piezoelectric ceramic voltage transformer, a waveform recorder, a small current fault line selection device and a processor. The piezoelectric ceramic voltage transformer collects thephase-to-ground voltage of a line. The zero sequence current transformer collects the zero sequence current of the line when the line is failed. When the jump of the zero sequence current of the lineor the phase-to-ground voltage of the line exceeds the trigger value of the waveform recorder, the waveform recorder records voltage and current waveforms and transmits the recorded current and voltage waveform data to the processor. The processor can determine the fault type according to the current and voltage waveforms, and then transmits a faulty line signal to the small current fault line selection device. Sufficient data support including the zero sequence current of the line and the phase-to-ground voltage of the line is provided for accurate analysis of the faulty line. The system canbe used as an auxiliary means for line selection of the small current line selection device.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a small current fault line selection system based on piezoelectric ceramic voltage collection. Background technique [0002] 10kV and 35kV power distribution lines are the end of the power grid and the power supply of customers. Their reliable and stable operation is crucial to the reliability of power supply of the grid and the production of customers. When a single-phase ground fault occurs in the distribution line, it is necessary to accurately determine the faulty line, cut off the faulty line urgently and take corresponding safety measures to avoid further aggravation of the fault. [0003] In the prior art, a small current fault line selection device is usually used to determine the faulty line. The small current fault line selection device is a monitoring device installed in a substation and used to judge line faults when a single-phase grounding occurs on a distr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/02
CPCG01R31/085G01R31/50
Inventor 朱启龙刘红文钱国超李昊段兵
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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