Circuit breaker fault state diagnosis method and circuit breaker fault state diagnosis device
A circuit breaker fault and state diagnosis technology, which is applied in the field of circuit breaker fault state diagnosis device and circuit breaker fault state diagnosis, can solve the problem of fast and accurate diagnosis and unfavorable circuit breaker fault state that cannot satisfy the accuracy of circuit breaker and difficult circuit breaker issues such as real-time monitoring
Active Publication Date: 2015-08-12
FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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[0003] Zhang Yongkui of Hebei University of Technology and others published a DSP-based hardware circuit in the second issue of Volume 49 of "High Voltage Apparatus (High Voltage Apparatus)". Through the combination of wavelet analysis and dynamic time warping, the signal is processed and the circuit breaker is identified. The method of fault type, however, this method introduces wavelet decomposition, which reduces the speed of signal processing and is not conducive to the real-time monitoring of circuit breakers
[0004] In the Chinese invention patent with the publication number CN 103336243 A, a fault diagnosis method based on the current signal of the opening and closing coil is announced, which involves particle swarm algorithm, fuzzy C-means clustering algorithm and vector machine algorithm, although its analysis ideas have Feasibility, but due to its complicated calculation method and the uncertainty of the field measured signal, it cannot meet the accuracy of the online status evaluation of the circuit breaker
[0005] In summary, it is difficult for the existing technical solutions to quickly and accurately diagnose the fault state of the circuit breaker
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[0028] The specific implementation of the circuit breaker fault state diagnosis method of the present invention will be described in detail below with reference to the accompanying drawings.
[0029] reference figure 1 As shown, figure 1 It is a flowchart of the method for diagnosing a fault state of a circuit breaker of the present invention, including the following steps:
[0030] Step S101: Obtain the characteristic value f of the current signal of the closing and opening coil of the circuit breaker factory test 0 (t 10 , I 10 , S 0 ), where the core starting time t 10 , The core starting instantaneous current i 10 , The coil is energized to the core starting current is integrated with time S 0 .
[0031] reference figure 2 As shown, figure 2 It is the current signal characteristic waveform diagram of the opening and closing coil of the circuit breaker (the horizontal axis is time, the vertical axis is current), including five stages (①~⑤), respectively:
[0032] ①t=t 0 -t 1 , T 0...
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The invention provides a method and device for diagnosing the failure state of a circuit breaker. The method comprises the following steps of obtaining a current signal characteristic value f0 (t10, i10 and S0) of an opening and closing coil in a circuit breaker predelivery test; obtaining a current signal, in the power-on process, of the opening and closing coil of a circuit breaker to be tested; performing morphological filtering processing on the current signal to obtain the de-noised current signal of the opening and closing coil of the circuit breaker to be tested; calculating a corresponding characteristic value f1(t11, i11 and S1) of the de-noised current signal; judging whether the value meets the formula shown in the specification; if the value meets the formula shown in the specification, further judging whether the value meets a formula shown in the specification; if the value does not meet the formula shown in the specification, judging that an iron core of the circuit breaker is normal and a power supply of the opening and closing coil fails; if the value does not meet the formula shown in the specification, further judging whether the value meets the formula that (S1-S0) / S0 is larger than theta; if the value meets the formula that (S1-S0) / S0 is larger than theta, judging that starting lagging failures happen to the iron core of the circuit breaker. According to the technical scheme, the diagnosing efficiency can be improved, and the diagnosing precision can be obviously improved. The requirement that the circuit breaker is diagnosed online on site can be well met.
Description
Technical field [0001] The present invention relates to the technical field of circuit breaker monitoring, in particular to a circuit breaker fault state diagnosis method and a circuit breaker fault state diagnosis device. Background technique [0002] Circuit breakers are important equipment in power systems. The reliability of the performance of the circuit breaker is directly related to the operational reliability of the entire power grid, so the real-time evaluation of the working state of the circuit breaker is of great significance. More and more different online monitoring methods are proposed. The existing literature usually uses wavelet transform to extract the waveform characteristics of the monitored object, or only records the characteristic points of the monitored object's waveform without any processing. Correspondingly, in terms of high-voltage circuit breaker state evaluation and fault diagnosis, the existing literature can only judge according to the characteris...
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IPC IPC(8): G01R31/327
Inventor 李恒真孔华东刘益军黄松波刘根才董镝任亚英陈邦发黄静
Owner FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID