On-line detection device and detection method for opening and closing state of grounding knife switch

Abstract

The invention relates to an online detection device and an online detection method for the opening / closing state of a grounding knife switch. The detection device comprises a transmitting magnetic ring, a receiving magnetic ring, a transmitting box and a handheld control box, wherein the transmitting magnetic ring is arranged on a cable shielding layer grounding wire; the transmitting box is connected with the transmitting magnetic ring; the receiving magnetic ring is arranged on a switch cabinet grounding wire; and the handheld control box is connected with the receiving magnetic ring. The detection method comprises the following steps that the transmitting box transmits a signal, and the signal is coupled to a cable shielding layer by the transmitting magnetic ring; the receiving magnetic ring receives the signal from the transmitting magnetic ring; and the handheld control box performs amplification, filtering and digital-to-analogue conversion processing on the signal received by the receiving magnetic ring, transmits the signal to a signal processor, and the signal processor judges the current opening / closing condition of the grounding knife switch according to the amplitude of the received signal, and displays a judgment result on a liquid crystal display screen. Compared with the prior art, the device and the method have the advantages of capability of improving the power supply safety and reliability, adaptive adjustment function, wide application range and the like.

Description

technical field [0001] The invention relates to a detection device and method for electric equipment, in particular to an on-line detection device and detection method for the opening and closing state of a grounding knife switch. Background technique [0002] During the operation of the equipment, the grounding knife operating mechanism is prone to gradually produce local permanent cumulative damage (metal fatigue) due to the principle of leverage. After a certain number of cycles, there is the possibility of cracks or a sudden complete fracture process, and the material The quality and production process will also affect the long-term normal operation of the organization. Therefore, after long-term operation, the occurrence of events like link breakage may be unavoidable. The deformation of the grounding knife switch operating link will cause the indication of the grounding knife switch position indicating device to be inconsistent with the actual position. In addition, ...

AI Technical Summary

Problems solved by technology

[0002] During the operation of the equipment, the grounding knife operating mechanism is prone to gradually produce local permanent cumulative damage (metal fatigue) due to the principle of leverage, and the possibility of cracks or sudden complete fracture after a certain number of cycles exists, and the material The quality and production process will affect the long-term normal operation of the organization

Therefore, after long-term operation, the occurrence of events like link breakage may be unavoidable

The deformation of the grounding knife switch operating link will cause the indication of the grounding knife position indicator device to be inconsistent with the actual position

In addition, due to the limited space of the 10kV switch room, the operator cannot go to the back of the 10kV switch cabinet to check the actual position of the grounding switch

Therefore, in the operation of opening and closing the grounding knife switch, when the aforementioned problems occur and the actual position of the switch knife cannot be checked, the failure to close the grounding knife switch may cause personal safety accidents for maintenance personnel, and the failure to separate may cause grid safety accidents

Images