Multisource partial discharge detection method and device of transformer substation based on time-frequency characteristic parameters

Abstract

The invention discloses a multisource partial discharge detection method and device of a transformer substation based on time-frequency 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 of a pulse waveform of the ultra-high-frequency signal from the UHF antenna to form a waveform segment sequence; calculating a time-frequency parameter according to the waveform segment sequence and determining a time-frequency characteristic vector; carrying out fuzzy clustering analysis on the time-frequency characteristic vector; 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 of power systems, in particular to a method and device for detecting multi-source partial discharge in a substation based on time-frequency characteristic parameters. Background technique [0002] The existing domestic methods for monitoring and locating partial discharges in substations are basically to first perform partial discharge monitoring and positioning for individual power equipment in the substation, and then comprehensively evaluate the partial discharge status of the entire substation power equipment. Partial discharge detection for individual substation equipment (GIS geographic information systems, transformers, capacitive equipment, etc.) is generally achieved by monitoring the electrical signals, radio frequency signals, acoustic signals or other chemical or physical quantities generated by partial discharge. In the long-term inspection and maintenance process, beca...

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

Images