Distribution network ground fault location method and device based on integrated node injection current

Abstract

The invention discloses a distribution network grounding fault location method and device based on node comprehensive injection current. The line between nodes is divided into a section; use the zero-mode voltage and zero-mode current detected by each measuring point at the end of the network to calculate the voltage of each branch point on the estimated path between the measuring point and the section, and then obtain all branch lines Zero-mode current; use the calculated zero-mode current and measured current to calculate the node injection current; then based on the multi-time measurement data, obtain the node comprehensive injection current; finally output the section corresponding to the minimum sum of the node comprehensive injection current as the fault area part. In this way, the present invention can realize blind zone-free positioning of the ground fault section in the scene where the measuring point is locally limited, and the positioning accuracy of the fault section is not affected by the neutral point grounding method, transition resistance and initial fault phase angle, and has the advantages of Good application prospects.

Description

technical field [0001] The invention belongs to the technical field of location of distribution network fault sections, and more specifically relates to a distribution network ground fault location method and device based on node integrated injection current. Background technique [0002] There are many branch nodes in the distribution network, and the branch points divide the feeder into multiple sections, and the section location is to determine the section where the fault point is located. Fault section location is the premise of precise fault location, and it is also the key to fault isolation and power restoration in non-faulty areas. Therefore, it is of great practical significance to carry out research on the fault location of distribution network. [0003] Existing distribution network fault section location methods mainly include matrix method, artificial intelligence method and zero-mode current detection feature method; matrix method and artificial intelligence m...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects and improvement needs of the prior art, the present invention provides a distribution network ground fault location method and device based on node comprehensive injection current, aiming at solving the problem that the existing distribution network ground fault location method assumes that the measuring points are completely However, due to the limitation of the space and force of the tower, usually the measuring points can only be arranged at the end of the network and some branch points, which causes the technical problem of inaccurate ground fault location

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