Tripping monitoring method for a 10kV circuit breaker

Abstract

The invention discloses a tripping monitoring method for a 10kV circuit breaker. The method specifically includes the following steps that: step 1, a signal acquisition module acquires signals; step 2, a signal conditioning module filters and amplifies the acquired signals in step 1 and transmits the signals to a processor; step 3, the processor judges whether the acquired signals exceed a set threshold value during an acquisition process; step 4, the processor performs wavelet denoising on the acquired signals; step 5, contact linear displacement L is calculated according a circuit breaker spindle angular displacement which has been subjected to wavelet denoising; step 6, the tripping time of the circuit breaker is calculated; and Step 7, the processor uploads the tripping time of the circuit breaker to a circuit breaker status monitoring IDE, so that the health condition of the circuit breaker can be monitored, and the service life of a contact can be predicted. With the tripping monitoring method for the 10kV circuit breaker of the invention adopted, the tripping time of the circuit breaker can be calculated accurately, and therefore, the health condition and mechanical life of the circuit breaker can be judged.

Description

technical field [0001] The invention belongs to the technical field of smart grid power distribution automation, and in particular relates to a bouncing monitoring method for a 10kV circuit breaker. Background technique [0002] Circuit breakers are the most critical electrical equipment for insulation and arc extinguishing in switching electrical appliances. During normal operation, it is used to switch the operation mode of the equipment or line, and put the equipment or line into or out of operation. When equipment and lines fail, quickly remove and isolate the fault to ensure the normal operation of non-faulty users. Therefore, the circuit breaker is the most frequent switching device in the power system, and the circuit breaker will bounce every time it is opened / closed. The bounce time is an important factor affecting the electrical life and mechanical life of the circuit breaker, and if the bounce time is too long, it will cause a series of faults, such as contact w...

AI Technical Summary

Problems solved by technology

In addition, if the circuit breaker is operated with electricity, if there is a bounce between the two contacts, the arcing time of the arc will be prolonged, which will increase the depth and breadth of melting on the surface of the contacts. The two contacts are fused and welded together, and the opening force of several thousand Newtons of the operating mechanism cannot be pulled apart.

If the welding spot is very small, although the opening force can be pulled apart, the surface of the contact is often pulled and deformed, resulting in a short circuit of the recovery voltage after breaking

Therefore, the result of fusion welding may cause short-circuit breaking failure, and sometimes even cause damage to the arc extinguishing chamber

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