Rectifier transformer in power system and setting method for overcurrent protection on it

Abstract

The invention discloses a rectifier transformer of a power system, wherein, the action current setting value of the definite time limit overcurrent protection device is set according to the overload capacity of the rectification transformer; the current setting value of the low voltage blocking overcurrent protection device operating condition is set according to The short-circuit current flowing through the high-voltage side of the low-voltage side of the rectifier transformer in the minimum operation mode of the avoidance system is set for two-phase short-circuit, and the voltage setting is set according to the lowest operating voltage that may occur on the low-voltage side of the rectifier transformer; the low-voltage blocking overcurrent protection device The action time of the definite-time overcurrent protection device is the same as that of the definite-time overcurrent protection device, and it is set according to a time difference higher than that of the lower-level instantaneous protection. It can avoid the occurrence of overcurrent protection misoperation and tripping accidents when the load within the allowable range is heavy, and can ensure the safe and reliable operation of the rectifier transformer. Also disclosed is a rectifying transformer overcurrent protection setting method used in the power system.

Description

technical field [0001] The present invention relates to the technical field of transformers, more specifically, to a rectifier transformer of a power system, and also to an overcurrent protection setting method for a rectifier transformer of a power system. Background technique [0002] According to the safety requirements of the industry, the rectifier transformer should be equipped with the following protections: 1. Current quick-break protection for multi-phase short circuit inside the transformer and its primary line; 2. Definite time overcurrent protection for rectifier group short circuit; 3. Inverse time limit for rectifier group overload Overcurrent protection; 4. Gas protection for internal faults of transformers; 5. Temperature signal device for excessive temperature rise of transformers. [0003] When actually performing protection setting, the rectifier transformer is equipped with protections such as current quick break, definite time overcurrent, overload (send...

AI Technical Summary

Problems solved by technology

[0014] In view of this, the first purpose of the present invention is to provide a rectifier transformer for a power system, which can effectively solve the problem of poor operation stability of current rectifier transformers, and the second purpose of the present invention is to provide a rectifier transformer Setting Method for Overcurrent Protection of Rectifier Transformer Used in Power System

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