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

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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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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