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Life evaluation method of high voltage circuit breaker based on online monitoring of mechanical, electrical and gas states

A high-voltage circuit breaker and gas state technology, which is applied in the field of life evaluation of high-voltage circuit breakers, can solve problems such as low system reliability and failure to consider parts repair

Active Publication Date: 2019-11-08
STATE GRID JIANGSU ELECTRIC POWER CO LTD MAINTENANCE BRANCH +2
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Problems solved by technology

The traditional series reliability model based on the reliability block diagram does not take into account the repair of parts. At the same time, it is considered that the parts are in a simple series relationship, and the obtained system reliability results are low. It is necessary to find other system reliability analysis methods to analyze high-voltage open circuits. Lifetime assessment of device mechanical reliability; the present invention addresses such issues

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  • Life evaluation method of high voltage circuit breaker based on online monitoring of mechanical, electrical and gas states
  • Life evaluation method of high voltage circuit breaker based on online monitoring of mechanical, electrical and gas states
  • Life evaluation method of high voltage circuit breaker based on online monitoring of mechanical, electrical and gas states

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Embodiment Construction

[0067] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0068] The life evaluation method of high-voltage circuit breaker based on on-line monitoring of mechanical, electrical and gas conditions includes the following steps:

[0069] Step 1, through the Markov process principle, obtain the state transition probability density for a system with n states; the specific process is as follows: For a Markov process, as long as the previous state X(t n-1 ) has been determined, then the next state X(t n ) can be determined according to the previous state, while the state X(t n ) is not linked to an earlier state, i.e.

[0070] P{X(t n )|X(t n-1 )}=P{X(t n )|X(t 1 ),X(t 2 ),…,X(t n )} (1)

[0071] Equation (1) indicates that the previous state is X(t n-1 ) and the first n-1 states are X(t n-1 ), X(t n-1 ),...,X(t n-1 ), t n The state at time is X(t n ) is the same conditional probability, acco...

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Abstract

The invention discloses a high-voltage circuit breaker lifetime evaluation method based on online monitoring of mechanical, electrical and gas states. According to the high-voltage circuit breaker lifetime evaluation method, failure and on-off of an SF6 circuit breaker are monitored by means of SF6 gas pressure, switching-on / off coil currents and operating mechanism vibration signals, and are provided to a Markov model as a basis; the operating mechanism vibration Markov model considers failure states including a normal state, a spring force output anomaly and the like, the model is closer to the actual situation, the lifetime evaluation is more precise; a high-voltage circuit breaker system reliability analysis model based on a fault tree model and the Markov model is established, a failure rate curve of each part is obtained through fitting by means of the MATLAB, a relation curve of system reliability and operation times is obtained through calculation, and finally the lifetime evaluation of the circuit breaker is carried out, thus the obtained result is more precise and reliable.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a life evaluation method for high-voltage circuit breakers. Background technique [0002] High-voltage circuit breakers play an important role in protection and control in the power system. On the one hand, as a dispatching control device for the power grid, according to the needs of power grid operation, the high-voltage circuit breaker implements the operation of putting in or cutting off specific lines, and on the other hand, it protects the power system. In the event of a short-circuit fault in the system, the circuit breaker can cut off the huge short-circuit current to ensure the stable and normal operation of the system. The fault types of high-voltage circuit breakers are complex, including failures of machinery, insulation, control loop, liquid leakage and gas leakage. The research on the overall reliability of high-voltage circuit breakers is a huge systematic project invol...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/327G01M13/00
CPCG01M13/00G01R31/3271G01R31/3274
Inventor 田涛陈昊朱超陈玮光谭风雷张兆君许驰张建忠
Owner STATE GRID JIANGSU ELECTRIC POWER CO LTD MAINTENANCE BRANCH
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