A UHF Partial Discharge Online Monitoring System Based on Spatial Filtering Method

Abstract

The invention belongs to the electric equipment partial discharge online monitoring field and particularly relates to an ultra high frequency partial discharge online monitoring system based on a spatial filtering method. The system comprises a signal acquisition unit, a signal processing unit and a display control unit, wherein the signal acquisition unit is externally provided with a spatial filtering cover used for filtering external interference signals and preventing the signal acquisition unit from being influenced by electromagnetic and noise interference to greatly improve monitoring sensitivity, a frequency selection scope of a frequency selection surface filtering structure of the spatial filtering cover is in a range of 300MHz-3GHz, signal interference of non-work frequency ranges can be effectively reduced, through adjusting the number of frequency selection surface layers and dimensions of a metal unit, the selection scope of the frequency can be adjusted randomly, and the system can be widely applied to each frequency range of electromagnetic waves.

Description

technical field [0001] The invention belongs to the field of on-line partial discharge monitoring of electric power equipment, in particular to an ultra-high frequency partial discharge on-line monitoring system based on a space filtering method. Background technique [0002] The safe and stable operation of power equipment is particularly critical to the safety and reliability of power systems. Insulation faults are the main faults in the operation of power equipment. Most of the insulation faults of power equipment are caused by partial discharge. Long-term partial discharge makes power equipment Insulation deterioration occurs, which will cause insulation breakdown or flashover of equipment in a short period of time after it develops to a certain extent, resulting in short circuit of equipment, causing vicious accidents of power grid blackout, and causing huge direct and indirect losses. Therefore, on-line monitoring of partial discharge It is of great practical significa...

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Problems solved by technology

[0002] The safe and stable operation of power equipment is particularly critical to the safety and reliability of power systems. Insulation faults are the main faults in the operation of power equipment. Most of the insulation faults of power equipment are caused by partial discharge. Long-term partial discharge makes power equipment Insulation deterioration occurs, which will cause insulation breakdown or flashover of equipment in a short period of time after it develops to a certain extent, resulting in short circuit of equipment, causing vicious accidents of power grid blackout, and causing huge direct and indirect losses. Therefore, on-line monitoring of partial discharge It is of great practical significance to ensure the safe operation of power equipment to grasp the insulation status of power equipment in time.

[0003] The site situation of power equipment is complicated, and there are a lot of interference signals, such as background noise, corona pulse, internal discharge of other equipment, radio waves, carrier communication, switching actions in the system, etc. The external interference is serious, and the discharge electromagnetic signal is not easy to receive, and Due to the large amount of data, it is difficult to process the data in real time

Traditional partial discharge on-line monitoring devices have poor anti-interference performance, and the monitoring sensitivity and safety cannot be guaranteed. Therefore, it is urgent to provide a new type of ultra-high frequency partial discharge on-line monitoring system with strong anti-interference performance

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