Filter bank circuit breaker closing resistor insulation fault detection method

Abstract

The invention relates to a filter bank circuit breaker closing resistor insulation fault detection method, which comprises the following steps of: extracting characteristic parameters capable of representing whether a closing resistor flashovers or not by analyzing inrush current waveforms in a resistor switching process under the conditions of no insulation fault and insulation fault of the filter bank circuit breaker closing resistor; establishing a BP neural network fault detection model according to the extracted characteristic parameters and a BP neural network, wherein the BP neural network is used for establishing a mapping relation between the characteristic parameters and the insulation fault information of the closing resistor of the circuit breaker for the filter bank; acquiring actual characteristic parameters of the to-be-detected circuit breaker for the filter bank by using existing characteristic parameter acquisition equipment; and taking the actual characteristic parameters as input parameters of a BP neural network fault detection model, and judging whether the to-be-detected circuit breaker for the filter bank has a fault or not by using the BP neural network fault detection model.

Description

technical field [0001] The invention relates to the technical field of insulation fault detection of a circuit breaker closing resistance, in particular to a method for detecting an insulation fault of a circuit breaker closing resistance for a filter bank. Background technique [0002] Vigorously develop hydropower, wind power, and thermal power resources in the west, implement power transmission from west to east, and at the same time realize mutual power supply between the north and the south, and national networking, so as to realize optimal allocation of resources and optimal energy supply across the country. basic strategy. [0003] High-voltage direct current transmission has obvious advantages in long-distance large-capacity transmission and power system networking, and plays an important role in my country's west-to-east power transmission. Nonlinear components such as converter valves in HVDC converter stations consume a large amount of reactive power and generate...

AI Technical Summary

Problems solved by technology

The filter bank circuit breaker not only operates frequently, but also bears the action of AC and DC mixed voltage during the opening and closing process, and its internal closing resistor also needs to bear high voltage, which is prone to failure during operation

[0004] For example, because the closing resistor is stacked in a three-column parallel spiral structure, the overall length is long, and it is easy to cause abnormal discharge between the closing resistor and the insulating column during switching, resulting in the generation of metal dust during the closing process, which makes the electric field inside the gas chamber Distortion and flashover faults occur, so that the switching current waveform has no smooth suppression stage during the closing resistor input period, and there is obvious oscillation, which even affects the breaking life of the circuit breaker; the circuit breaker closing resistor for the filter bank is usually packaged as a whole In the tank of the circuit breaker, it is often difficult to directly observe the resistor body. If a non-permanent intermittent insulation flashover fault occurs, it cannot be obtained directly from the outside at the first time, and it is very likely to be ignored by the operation and maintenance personnel. The insulation of the closing resistor will be damaged. Further deterioration may eventually lose the effect of limiting the closing inrush current when it is put into operation

Images