Distribution automation system ground fault location method based on traveling wave measure and transient zero-module reactive power directions

A technology for distribution automation and ground faults, which is applied to fault locations, fault detection according to conductor types, and electrical measurement. It can solve the difficulties of ground faults in non-effectively grounded power grids at neutral points, and the accuracy of sample data is restricted and restrictive. question

Active Publication Date: 2017-06-13
国网山东省电力公司聊城供电公司 +1
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Problems solved by technology

However, this patent requires a large amount of sample data as a basis, and is restricted by the accuracy of the sample data, which is too restrictive
[0007] To sum

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  • Distribution automation system ground fault location method based on traveling wave measure and transient zero-module reactive power directions
  • Distribution automation system ground fault location method based on traveling wave measure and transient zero-module reactive power directions
  • Distribution automation system ground fault location method based on traveling wave measure and transient zero-module reactive power directions

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[0114] The distribution automation system ground fault location method based on traveling wave measurement and transient zero-mode reactive power direction, using the software MATLAB to establish a model for simulation verification, the distribution automation system is a 110kV / 10kV substation, with 6 feeders, K open When the neutral point is not grounded, when K is closed, it is a resonant grounded system. Such as Figure 7 As shown, the calculation step size of the simulation software is: 1μs, that is, 1×10 -6 s. The fault conditions are as follows: ① The initial phase angle of the fault is simulated in three situations of 30°, 60° and 90° respectively. ② Transition resistance, respectively take 10Ω, 100Ω and 500Ω for simulation. ③ The location of the fault point is 4km, 5km, 6km away from the busbar and the busbar. Specific steps include:

[0115] (1) Use the small current line selection method of traveling wave measurement to point out the possibility of ground faults

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Abstract

The invention relates to a distribution automation system ground fault location method based on a traveling wave measure and transient zero-module reactive power directions. The method comprises the steps that firstly which feeder a ground fault is located on is determined by means of the small current line selection method of the traveling wave measure; secondly, based on the transient zero-module reactive power flow directions, a ground fault point is localized on a fault feeder, wherein on the feeder where the ground fault is located, the transient zero-module reactive power flow directions of any two adjacent feeder terminal units (FTUs) are monitored, if the product of the transient zero-module reactive power flow directions of some two adjacent feeder terminal units (FTUs) is negative, it is explained that the ground fault is located between the two adjacent feeder terminal units (FTUs), and if the product of the transient zero-module reactive power flow directions of some two adjacent feeder terminal units (FTUs) is positive, it is explained that no ground fault exists between the two adjacent feeder terminal units (FTUs). By means of the method, the ground fault is accurately localized, and which two feeder terminal units (FTUs) the ground fault is located between is determined, and good sensitivity is achieved to a high-resistance ground fault.

Description

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Claims

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Application Information

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Owner 国网山东省电力公司聊城供电公司
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