Relay protection safety evaluation method

Abstract

The invention discloses a safety evaluation method for relay protection. Firstly, the safety evaluation index system for relay protection is divided; the evaluation index system includes three types of secondary indexes: safety index taking into account protection failure, protection fixed value safety Margin indicators and protection device safety indicators; according to the actual needs of the project, select specific evaluation indicators as the underlying indicators; assign weights to the selected underlying indicators according to their importance; determine the actual measurement of the underlying indicators based on the current actual power grid operating data value; find the reference value provided in the relevant literature to determine the standard value of the underlying index, compare the measured value with the standard value, and convert the measured value of the underlying index into a score value; combine the score value and the assignment of the underlying index The weighted results are calculated to obtain the evaluation score under the safety dimension of relay protection. The above method can provide the maintenance and management R&D personnel of the relay protection device with an operation analysis idea of ​​protection within the safety dimension, and the evaluation results are more credible.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a safety evaluation method for relay protection. Background technique [0002] At present, my country's power grid has the characteristics of complex interconnected grid structure and AC-DC hybrid connection. While the super-interconnected power grid brings great benefits to people, it also brings great challenges to the operation and maintenance of the power grid. Relay protection is the first line of defense for the safety and security of the power system. Whether the relay protection can work normally has a significant impact on the operation of the power system. In large-scale interconnected power grids, local accidents may cause large-scale blackouts of the entire system, and the probability of accidents will increase as the scale of the power system expands. [0003] Relay protection is an important guarantee to prevent the expansion of accidents or chain reactions. ...

AI Technical Summary

Problems solved by technology

The safety of the relay protection system refers to the ability of the design characteristics of the protection system and the planned safety resources to meet the protection requirements. The existing technology has not conducted in-depth research on the safety index system of the relay protection, and the safety of the relay protection The content of indicators is becoming more and more important with the upgrading and development of current protection devices. If the framework of relay protection safety indicators is not scientifically divided and further research is carried out on this basis, it is impossible to comprehensively and accurately evaluate relay protection.

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