Positioning method of single-terminal radiation-type power-distribution-network single phase grounding fault

Abstract

The invention discloses a positioning method of a single-terminal radiation-type power-distribution-network single phase grounding fault. A specific frequency amplitude ratio in an initial zero mode voltage traveling wave first wave head signal at a measuring point and a phase difference are used to represent a distortion degree of a zero mode traveling wave high frequency component. A core idea is that a single phase grounding fault is applied to a selected position in a distribution network simulation system; a head and tail end zero mode voltage traveling wave first wave head high frequency component amplitude of a feed line and a phase are extracted to establish a standard amplitude ratio vector and a phase difference vector; through comparing an amplitude ratio and a phase difference acquired via actual fault calculation with a standard amplitude ratio and a phase difference, line selection and line section positioning are performed; and branch positioning is realized through energy of a zero mode current traveling wave first wave head high frequency component. Simulation shows that the method is not influenced by factors of an arc, a synchronous measurement error and the like, and high economical efficiency and a good practical value are possessed.

Description

technical field [0001] The invention belongs to the technical field of electric network fault location, and in particular relates to a single-phase ground fault location method of a single-end radiation distribution network. Background technique [0002] With the advancement of smart distribution network construction, fault location technology is of great significance for quickly finding faults, quickly restoring power supply time, and reducing economic losses for all parties. The topology of the distribution network is relatively complex, its line connection methods are also diverse, and various imbalances are common. These factors have brought many challenges to fault location. [0003] According to the scope of fault location, fault location methods for single-ended radial distribution network can be mainly divided into two categories: one is the general estimation method of the fault area, including line selection, branch (section) and line section location methods; the ...

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Problems solved by technology

[0005] In order to solve the technical problems raised by the above-mentioned background technology, the present invention aims to provide a method for locating a single-phase ground fault in a single-ended radial distribution network, which overcomes the shortcomings of the traditional traveling wave method such as complex implementation and high synchronization requirements

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