Low-current grounding intelligent route selection method and apparatus

A technology of small current grounding and line selection method, which is applied in the direction of measuring devices, measuring electricity, fault locations, etc., can solve the problems of complex structure of distribution network and failure to meet the reliability of power supply, and achieve the effect of improving the accuracy of line selection

Inactive Publication Date: 2009-07-15
NANJING INTELLIGENT DISTRIBUTION AUTOMATION EQUIP
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Problems solved by technology

With the development of distribution network, the structure of distribution network is becoming more and more complex, and the m

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  • Low-current grounding intelligent route selection method and apparatus
  • Low-current grounding intelligent route selection method and apparatus
  • Low-current grounding intelligent route selection method and apparatus

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[0050] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0051] The theoretical basis of the fault line selection method based on wavelet analysis is as follows:

[0052]The transient current generated by a small current ground fault is many times larger than the steady-state current. The charging and discharging between the system-to-ground capacitance and the fault point will produce high-frequency transient components with amplitude many times larger than the steady-state fundamental frequency. The transient signal contains abundant information and is easy to measure, and the frequency of the transient is relatively high. At this time, the arc suppression coil is equivalent to an open circuit and has no effect on the transient. Therefore, it is advantageous to use the fault transient information to select the line. The transient equivalent circuit is as follows figure 1 Shown.

[0053] Foundation figure 1 The ca...

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Abstract

A low current grounding intelligent route selecting method comprises: firstly judging whether the grounding fault happens or not; then acquiring the zero sequence current data before or after the fault to judge the route selecting. The steps for processing the obtained current data by sampling comprise: selecting the appropriate wavelet function; performing the wavelet decomposition for the fault signal; selecting the decomposition dimension with the maximum value as the characteristic dimension information of the fault; performing the wavelet reconstruction for the characteristic dimension information; judging the fault line. The apparatus for implementing the method comprises an event management module, a data processing module, a data acquiring module, a data communication module, a power supply module, a display and control module and a CAN communication module; the power supply module is connected with each module for supplying power; the output signal of the data acquiring module is transferred to the data processing module, the data processing module is connected with the event management module to perform the data communication; the event management module output is connected with the display and control module and the CAN communication module. The invention solves the problems existing in the prior art.

Description

Technical field: [0001] The invention belongs to the field of relay protection, in particular to a small current grounding intelligent line selection method and device for single-phase grounding faults in a small current grounding system. Background technique: [0002] my country's medium-voltage distribution network generally adopts the method of not grounding or grounding through arc suppression coils, which is what we call a small current grounding system. When a small-current grounding fault occurs, the symmetry of the system voltage is not destroyed and the current value is small, so the relevant regulations stipulate that the small-current grounding system can continue to run for 1 to 2 hours when a single-phase grounding fault occurs. However, since the voltage of the non-faulted phase rises to the line voltage when a fault occurs, long-term operation will cause single-phase grounding to become a multi-point short circuit. Moreover, when an arc is grounded, it will c...

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Application Information

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IPC IPC(8): G01R31/08G01R31/02
Inventor 徐建源孙浩
Owner NANJING INTELLIGENT DISTRIBUTION AUTOMATION EQUIP
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