如何提高继电保护（How to improve relay protection）.doc

如何提高继电保护（How to improve relay protection） Abstract: This paper summarizes the common causes of accidents, and classifies the types of accidents. Combined with the actual situation, the basic ideas and methods of analyzing and dealing with the general microcomputer relay protection accidents are put forward. Key words: relay protection; accident; treatment method 1 types of relay protection accidents 1.1 fixed value problem 1. The error of setting calculation II. Human setting error; device setting drift; a components aging and damage; B temperature and humidity influence; C fixed value drift problem 1.2 、 power supply problems: inverter voltage stabilized power supply, a ripple factor is too high, B output power is insufficient or stability is poor 1.3 TA saturation as the pivotal measure of relay protection TA two system, with the system short-circuit current increases rapidly, in the low pressure system of current transformer saturation has become increasingly prominent, has affected the correct action of relay protection device. W editor. Because the feeder protection is refused because of the saturation of the current transformer, the accident of the three switch of the main transformer and the main switch of the main transformer is happened. Due to the digital relay controlled by microcomputer, the main power supply is only about 5V, the effective range of the data acquisition part of the level is only about 10V, so it can effectively handle the signal range is smaller and the influence of current transformer saturation on digital relay will be greater. The influence on the auxiliary criterion (II) the influence of the algorithm based on the power frequency component, the influence on the different data acquisition methods, and the methods and Countermeasures to prevent the TA saturation. 1.4, the operation experience of anti-jamming shows that the anti-interference performance of microprocessor-based protection is poor, and the use of walkie talkie and other w