Switch cabinet in-cabinet type bus partial discharge real-time detection system

Abstract

The invention discloses a switch cabinet in-cabinet type bus partial discharge real-time detection system, a temperature, humidity and dust detection module is used for detecting the temperature, the humidity and the dust concentration of a detected part and transmitting a signal to a signal isolation and conditioning module, the signal isolation and conditioning module is used for carrying out pretreatment on a bus partial discharge signal and transmitting to a DSP signal processing module; the DSP signal processing module is used for processing the signal, producing the signal, and transmitting to an output control module; the output control module is used for receiving a control command and controlling an external control device to act; the DSP signal processing module is in communication with an external computer through a communication module; and the DSP signal processing module carries out man-computer interactive communication with a button display module. The switch cabinet in-cabinet type bus partial discharge real-time detection system can detect the bus partial discharge state which does harm to the safe operation of a switch cabinet in a real-time manner, give out a protection signal in time and improve the safety of operation of a power grid.

Description

technical field [0001] The invention belongs to the technical field of fault detection and diagnosis of medium and high voltage electrical equipment, and in particular relates to an in-cabinet system for real-time detection of partial discharge phenomenon of a bus bar of a medium voltage switch cabinet. Background technique [0002] When the switchgear is working, if there are weaknesses and defects inside the busbar insulation, local breakdown of the insulation will occur; and if the busbar body has sharp corners or sharp edges, it will lead to electric field concentration, and the above two situations will occur Partial discharge will occur. When the partial discharge of the busbar of the switchgear occurs, the lighter ones will cause abnormal operation of the equipment and further deterioration of the insulation, and the severer ones will destroy the equipment of the switchgear and cause serious safety accidents. [0003] At present, the technologies for detecting partia...

AI Technical Summary

Problems solved by technology

However, there are various structural or functional deficiencies in the use of these technologies today.

For example: infrared detection and ultrasonic detection are easily affected by ambient temperature and environmental noise, and the sensitivity is not high, while the pulse current method requires a special high-voltage device, etc.

In addition, there is still a big problem that these technologies cannot realize the real-time detection function in the cabinet

Ultrasonic and infrared detection techniques are used to detect partial discharges, but only through special instruments for regular inspections, but not real-time detection, and some instruments are only suitable for power equipment such as transformers and motors

As for the pulse current method, it is necessary to interrupt the operation of the switchgear during the detection, and apply the experimental voltage to extract the pulse signal caused by the partial discharge arc and corona. The detection method is time-consuming and causes the loss of the partial power grid interruption

In addition, during the testing process, the requirements for the technical level of the testing personnel are relatively high, which is not conducive to quickly handling the fault scene

[0004] At present, the technical scheme directly aimed at the real-time detection of partial discharge of switchgear busbars in the cabinet type has not been made public, and it can be said that it is still blank at home and abroad.

Images