Fast switching arc and harmonic elimination-based single-phase grounding fault line selection and location method

Abstract

The invention relates to a fast switching arc and harmonic elimination-based single-phase grounding fault line selection and location method and belongs to the circuit protection technical field. According to the fast switching arc and harmonic elimination-based single-phase grounding fault line selection and location method, when grounding occurs, zero sequence voltage triggers a line selection device to enter a collection state to collect zero-sequence current in each loop, and the zero-sequence current in each loop is processed, and first-stage zero-sequence current data of each loop is extracted; if arc light grounding occurs, an arc elimination device forcedly converts the arc light grounding into metal grounding, and the line selection device enters the collection state again to collect the zero-sequence current in each loop, so that second-stage zero-sequence current data can be obtained; corresponding first-stage zero-sequence current data are subtracted from the second-stage zero-sequence current data of each loop, so that incremental values can be obtained, and a line with the largest increment is a fault line; and one or more positioning methods are combined together to carry out fault interval positioning. The fast switching arc and harmonic elimination-based single-phase grounding fault line selection and location method of the invention is not affected by factors such as the magnitude of grounding resistance and the distance of a short-circuit point, and can select a fault line within 3ms after a grounding fault occurs. The method is stable and reliable and has high precision.

Description

[0001] Technical field: [0002] The invention relates to the technical field of circuit protection, in particular to a single-phase ground fault line selection and positioning method based on fast switch arc suppression and harmonic elimination. [0003] Background technique: [0004] Line selection protection in the prior art has long been a major problem in field operation, and its difficulties are mainly reflected in five aspects: [0005] (1) The fault steady-state signal is weak and the detection sensitivity is low [0006] (2) The single-phase grounding situation is complicated, and the arc at the fault point has a great influence [0007] (3) On-site interference is large and signal-to-noise ratio is small [0008] (4) The compensation degree of the arc suppression coil has a great influence [0009] (5) The fault transient characteristics are complex [0010] In addition to the technical difficulties discussed above, there is another very important reason: the exis...

AI Technical Summary

Problems solved by technology

[0023] The technical problem to be solved by the present invention is to overcome the existing technical defects, and provide a rapid switch arc suppression and harmonic elimination system that is not affected by factors such as the size of the grounding resistance and the distance of the short-circuit point, and has rapid line selection, stability, reliability, and high precision. Single-phase ground fault line selection and location method

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