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, ...

Examples

Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] Insulation fault is one of the most important possible faults in the operation of power equipment. Before the insulation fault of power equipment occurs, there will generally be a gradual partial discharge process, which will eventually lead to insulation breakdown. If partial discharge monitoring and diagnosis of operating equipment can be carried out during this process, partial discharge signals can be detected in time, and defects can be dealt with in advance, so that the occurrence of insulation breakdown faults can be effectively avoided. The positioning of the partial discharge location is also helpful to formulate a more targeted maintenance treatment plan, reduce power outage time, and improve maintenance efficiency.

[0027] The ultra-high frequen...

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, ...

Examples

Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] Insulation fault is one of the most important possible faults in the operation of power equipment. Before the insulation fault of power equipment occurs, there will generally be a gradual partial discharge process, which will eventually lead to insulation breakdown. If partial discharge monitoring and diagnosis of operating equipment can be carried out during this process, partial discharge signals can be detected in time, and defects can be dealt with in advance, so that the occurrence of insulation breakdown faults can be effectively avoided. The positioning of the partial discharge location is also helpful to formulate a more targeted maintenance treatment plan, reduce power outage time, and improve maintenance efficiency.

[0027] The ultra-high frequen...

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