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Zero-sequence voltage measuring method and device

A zero-sequence voltage and measurement method technology, which is applied to measuring devices, measuring electrical variables, measuring current/voltage, etc., can solve problems such as functional loss and single fault diagnosis function, and achieve the effect of improving accuracy and solving functional loss

Active Publication Date: 2017-05-31
STATE GRID BEIJING ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The embodiment of the present invention provides a method and device for measuring zero-sequence voltage to at least solve the technical problem of single-phase grounding fault diagnosis function due to the lack of functionality in zero-sequence voltage measurement in the related art

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  • Zero-sequence voltage measuring method and device

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Embodiment 1

[0031] According to an embodiment of the present invention, an embodiment of a zero-sequence voltage measurement method is provided. It should be noted that the steps shown in the flow chart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and, Although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.

[0032] figure 1 is a schematic flow chart of a zero-sequence voltage measurement method according to an embodiment of the present invention, such as figure 1 As shown, the method includes the following steps:

[0033] Step S102, obtaining the working frequency of the power distribution system, and calculating the power frequency period according to the working frequency;

[0034] Step S104, perform synchronous sampling according to the time synchronization of short-distance wireless communication,...

Embodiment 2

[0090] According to another aspect of the embodiment of the present invention, a zero-sequence voltage measuring device is also provided, Figure 6 is a structural schematic diagram of a zero-sequence voltage measuring device according to an embodiment of the present invention, such as Figure 6 shown, including:

[0091] The obtaining module 62 is used to obtain the working frequency of the power distribution system, and calculates the power frequency cycle according to the working frequency; the period division module 64 is used to perform synchronous sampling according to the short-distance wireless communication time synchronization, and to perform power frequency cycle according to the sampling frequency Period division to obtain N periods; Sampling module 66 is used to sample the three-phase voltage in N periods to obtain the sampling data corresponding to each period; Calculation module 68 is used to calculate the amount of voltage mutation in the sampling data, and Ju...

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Abstract

The invention discloses a zero-sequence voltage measuring method and device. The method includes the steps: acquiring working frequency of a power distribution system, and calculating working frequency periods according to the working frequency; performing synchronous sampling for time according to short-distance wireless communication, and performing time period division for the working frequency periods according to sampling frequency to obtain N time periods; performing sampling for three-phase voltage in the N time periods to obtain sampling data corresponding to time periods; calculating voltage sudden variables in the sampling data, and judging whether the voltage sudden variables are larger than or equal to threshold values; executing corresponding processes according to judging results. The zero-sequence voltage measuring method solves the technical problem of single-phase ground fault diagnostic functions caused by functional deficiencies of zero-sequence voltage measuring aspects in correlation technique.

Description

technical field [0001] The invention relates to the application field of electrical technology, in particular to a method and device for measuring zero-sequence voltage. Background technique [0002] my country's 10 kV distribution network mainly adopts the neutral point non-effective grounding operation mode. The overhead mixed network is increasing year by year, and the insulation rate of overhead lines is low. Operation statistics show that the probability of single-phase grounding faults in my country's 10kV distribution network is high, resulting in about 70% above unplanned outages. However, the single-phase ground fault current is small, and it is difficult to locate the fault area. If the location of the single-phase ground fault section can be realized, the difficulty of fault line inspection can be greatly reduced, and the probability of phase-to-phase short circuit caused by single-phase ground fault can be reduced, the loss of power failure can be reduced, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
CPCG01R19/00
Inventor 刘漫雨吕立平郭上华张维林涛迟忠君辛锋袁清芳谷君闻宇许冲冲
Owner STATE GRID BEIJING ELECTRIC POWER