Feeder terminal information interaction-based small-current grounding fault location method

A small current grounding and feeder terminal technology, applied in the field of intelligent distribution network, can solve the problems of aliasing of line fault characteristic components, positioning errors, etc.

Active Publication Date: 2015-11-18
合肥庐阳科技创新集团有限公司
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Problems solved by technology

[0008] However, the traditional EMD algorithm is used to deal with the high-frequency component of the fault current. After EMD decomposition, it is easy to alias with the characteristic component of the line fault. If it is directly applied to the fault location, especially when the fault distance is close, the high-frequency disordered zero-mode current component will be mixed. characteristic zero-mode currents, which may cause positioning errors

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  • Feeder terminal information interaction-based small-current grounding fault location method
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  • Feeder terminal information interaction-based small-current grounding fault location method

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[0053] In this example, if figure 1 As shown, a small current grounding fault location method based on feeder terminal information interaction is applied in the distribution network, which contains a master station ( figure 1 Indicated by a square icon) and N feeders connected to it, the main station is the distribution network system control center, and the operator monitors the operation of the entire distribution network and the equipment of the distribution network through the main station, such as the feeder terminal of the present invention Sending the corresponding information and uploading the final positioning information must be completed through the master station. The structure of the distribution network is complex, often composed of multiple feeders, and the branches of the i-th feeder are respectively set with n i Feeder terminal, 1≤i≤N; denoted as Indicates the p-th feeder terminal on the i-th feeder, 1≤p≤n i ;Such as figure 1 The dotted line shows the pos...

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Abstract

The present invention discloses a feeder terminal information interaction-based small-current grounding fault location method. The method includes the following steps that: 1, a feeder terminal acquires the addresses of adjacent feeder terminals; 2, a main station calculates a fault transient characteristic frequency band and issues the fault transient characteristic frequency band; 3, zero-mode current on each branch is measured; 4, characteristic zero-mode current on each branch is obtained through using an improved empirical mode decomposition algorithm; and 5, the feeder terminal acquires waveform similarities and average phase differences between the branches so as to judge a grounding fault and uploads fault information to the main station. With the feeder terminal information interaction-based small-current grounding fault location method of the invention adopted, a power distribution network can automatically carry out fault location, and therefore, fault location judgment efficiency can be improved, and the reliability of electricity use of users can be increased.

Description

technical field [0001] The invention relates to the field of intelligent distribution network, in particular to a small current grounding fault location method based on feeder terminal information interaction. Background technique [0002] In order to suppress the current at the small current grounding fault point, the distribution network in my country has widely adopted the small current grounding method. Although it ensures that the distribution line works in an abnormal state for a short time, due to technical reasons, the current on-site line maintenance personnel still widely use the grounding method. The traditional line-by-line inspection method. Even if the fault is found to go out, the maintenance personnel still need to inspect the line point by point to find the fault location and eliminate the fault. The work is intensive and time-consuming. The traditional fault identification method is often to compare the fixed value of the electrical quantity collected by th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 王磊骆玮曹现峰
Owner 合肥庐阳科技创新集团有限公司
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