Method for calculating optimal repair cycle of relay protection device in view of software and human factors

Abstract

The invention discloses a method for calculating an optimal repair cycle of a relay protection device in view of software and human factors, and belongs to the technical field of power system protection. The method comprises the steps as follows: listing out all the states of the relay protection device, which includes software failure and the human factors, and establishing a Markov state transition diagram; determining parameters in a Markov model according to practical measurement data of a power grid; obtaining an unavailability calculation formula of the relay protection device according to the established Markov model, that is, the relation between the unavailability and the repair cycle; and calculating the repair cycle corresponding to the minimal unavailability according to the relation between the unavailability and the repair cycle, that is, the optimal repair cycle of the relay protection device. According to the method, the software and the human factors are considered, so that the fault state of the delay protection device can be more accurately reflected, so as to enable the optimal repair cycle to be calculated more accurately.

Description

technical field [0001] The invention relates to a method for calculating the optimal maintenance cycle of a relay protection device considering software and human factors, and belongs to the technical field of power system protection. Background technique [0002] The relay protection device is an important device to ensure the safe operation and reliable power supply of the power supply system. When the power grid fails, if the relay protection device cannot operate correctly, it will not only expand the fault of the power system, but may even cause the entire power grid to collapse due to an adverse chain reaction, resulting in a large-scale power outage, which will seriously affect people's normal life and economic development. and social stability are seriously affected. Therefore, ensuring the reliability of the relay protection device is a very important content to ensure the safe and stable operation of the power grid. Reliability analysis and research on the relay ...

AI Technical Summary

Problems solved by technology

However, if the maintenance interval of preventive maintenance is too short, excessive maintenance will occur (statistics in the network show that the troubleshooting rate of periodic inspection is less than 2%), which increases the possibility of personnel fault, and the more frequent the maintenance, the worse the project will be. If it is cumbersome, the possibility of human error is greater (that is, the probability of mishandling, miswiring, and missetting is increased (a large number of misoperation accidents show that 80% of them are attributable to humans)

However, the existing Markov model for relay protection devices has not yet proposed a more reasonable Markov model including human failure and software failure factors, so the calculation method of the optimal maintenance cycle based on the Markov model almost ignores the influence of human factors and software failure

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