Twofold startup method protected by microcomputer protecting equipment

Abstract

The invention discloses a microwave oven protection device and a dual startup method. The method includes the procedures of current increment measurement during each sampling period, current increment comparison, counter operation, Fourier transformation and CPU output, etc. The invention combines the traditional threshold startup method and the newly added increment startup method, i.e. the threshold startup method is adopted for backup protection and the increment method is adopted for main protection and other protection types, thereby, the CPU occupation rate is reasonably arranged, the work efficiency of the CPU is improved, and the requirement of different startup types of the microcomputer is satisfied; in addition, the invention adopts two protection startup modes, thereby, the system tasks can be rationally allocated, the system load can be alleviated, and the speed, flexibility and reliability of protection is also improved.

Description

technical field [0001] The invention relates to the field of microcomputer protection of electric power systems, in particular to a dual-start method for protection by a microcomputer protection device. Background technique [0002] The microcomputer protection device is a relay protection device composed of a microprocessor. Because of its high reliability, high selectivity, high sensitivity, and high information program, the microcomputer protection device has been used in the power system relay protection. widely used. [0003] At present, all the functions such as rapidity and high sensitivity possessed by the microcomputer protection device are realized through the start-up mode of the protection of the microcomputer protection device. The start-up mode of the traditional microcomputer protection device protection is a single threshold start-up method. Since the threshold-value start-up method uses a timing query method, it is necessary to continuously query various in...

AI Technical Summary

Problems solved by technology

The start-up mode of the traditional microcomputer protection device protection is a single threshold start-up method. Since the threshold-value start-up method uses a timing query method, it is necessary to continuously query various information, which leads to the threshold-value start-up protection mode. A large amount of CPU running time affects the protection sensitivity of the microcomputer protection device, especially the sensitivity of the differential protection cannot be further improved, and its rapidity and reliability are difficult to guarantee; at the same time, with the development of computer technology and semiconductor technology With rapid development, the functions of microcomputer protection devices are becoming more and more powerful, and the degree of informatization is also getting higher and higher. Its application field has also rapidly expanded from a single professional power user to end users such as factories, mines, enterprises, businesses, and troops. Therefore, in Under the requirements of high informationization and high sensitivity of users, the protection selectivity, sensitivity and reliability of traditional microcomputer protection devices cannot meet the high needs of users.

Therefore, the protection start-up method of the traditional microcomputer protection device can no longer meet the needs of users, and it is imperative to improve the protection start-up method of the microcomputer protection device

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