Actually measured data based calculation method for time-varying failure rate of relay protection apparatus

Abstract

The present invention discloses an actually measured data based calculation method for a time-varying failure rate of a relay protection apparatus. The method comprises: acquiring historical failure data of the relay protection apparatus, and according to a predetermined basis of determination, screening out random failure data and ageing failure data from the historical failure data; estimating a random failure rate lambda 0 on the random failure data by adopting an estimation method for a constant failure rate; with respect to the aging failure data, performing distribution calculation on the aging failure data by using a mathematical expectation formula as an empirical distribution function, and performing fitting calculation on a distribution calculation result to obtain a failure probabilistic distribution function of the relay protection apparatus so as to calculate an aging failure rate lambda 1(t); and according to the random failure rate lambda 0 and the ageing failure rate lambda 1(t), estimating the time-varying failure rate of the relay protection apparatus. The method provided by the present invention can be applied to the time-varying failure property study based on the failure data of the protection apparatus in a station, so that the calculation of the failure rate better meets an actual condition, and the failure state of the apparatus can be predicted according to a calculation result.

Description

technical field [0001] The invention relates to the technical field of power system protection, in particular to a method for calculating a time-varying failure rate of a relay protection device based on measured data. Background technique [0002] The relay protection device is an important barrier for the stable operation of the power system and an important device to ensure the quality of power and the safety of the power grid. If the relay protection device cannot quickly and accurately cut off the fault when a fault occurs, it will not only make the local fault more serious, but also expand the scope of the fault. Serious impact on electricity safety, economic development and normal life. [0003] In view of this, evaluating the reliability of the relay protection device and studying its failure characteristics can make guiding suggestions for the operation and maintenance of the relay protection device, which is more conducive to the stable and safe operation of the r...

AI Technical Summary

Problems solved by technology

[0004] However, at present, the reliability evaluation of relay protection devices mostly stays in the stage of reliability evaluation of fixed values

However, in actual situations, the failure characteristics of relay protection devices have an important relationship with time. Simply considering device reliability as a fixed probability problem cannot truly reflect the failure characteristics of relay protection devices.

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