Multisource partial discharge detection method and device of transformer substation based on space characteristic parameters

Abstract

The invention discloses a multisource partial discharge detection method and device of a transformer substation based on space characteristic parameters. The method comprises the following steps of: collecting an ultra-high-frequency signal received by a UHF (Ultra-High Frequency) antenna in pre-set time; obtaining a segment group of a pulse waveform of the ultra-high-frequency signal from the UHF antenna to form a waveform segment group sequence; calculating a time delay of each antenna according to the waveform segment group sequence, calculating a space characteristic vector to form a sequence and carrying out fuzzy clustering analysis on a space characteristic vector sequence; comparing a characteristic of each classified pulse waveform in a result of the clustering analysis with a characteristic of a pre-set ultra-high-frequency pulse waveform; and determining the type of the pulse waveform. With the adoption of the invention, ultra-high-frequency discharge signals are clustered by using a fuzzy clustering method through that the characteristics of the ultra-high-frequency discharge signals generated based on different discharge power supplies in time domains and frequencies are different, so as to separate the partial discharge UHF signals generated by the different discharge power supplies.

Description

technical field [0001] The invention relates to the technical field of high voltage and insulation in power systems, in particular to a method and device for detecting multi-source partial discharges in substations based on spatial characteristic parameters. Background technique [0002] The existing domestic methods for monitoring and locating partial discharge in substations are basically to monitor and locate partial discharge for a single power equipment in the substation, and then evaluate the partial discharge status of the entire substation power equipment based on the monitoring situation of each power equipment. Partial discharge detection for single substation equipment (GIS geographic information system, transformer, capacitive equipment, etc.) is generally realized by monitoring electrical signals, radio frequency signals, acoustic signals or other chemical or physical quantities generated by partial discharge. In the long-term detection and maintenance process, ...

AI Technical Summary

Problems solved by technology

In the long-term detection and maintenance process, because the equipment is always in the maintenance process, the possibility of partial discharge occurring in multiple places of a single equipment at the same time is relatively small. At present, the partial discharge monitoring system applied to a single equipment basically does not consider the multi-source partial discharge. Happening

[0003] For partial discharge monitoring of the entire substation, any high-voltage power equipment in the substation may have a partial discharge fault. Partial discharge monitoring device, which can automatically distinguish the partial discharge signals of different power equipment, but this requires the installation of multiple sets of partial discharge monitoring devices, which requires a lot of time and financial resources for equipment procurement and installation; when testing, it is necessary to carry multiple sets of different types of instruments , the operation is inconvenient; the maintenance and management of many monitoring devices also consume a lot of time and manpower

The current monitoring form is difficult to meet the development needs of remote management of smart substations in the future

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