Protective device for single-phase transformer applicable to traction substation

Abstract

The invention provides a protective device for a single-phase transformer applicable to a traction substation, which covers related protective functions of the single-phase transformer such as differential protection, back-up protection, non-electric quantity protection and the like. The protective device is concise and complete and is applicable to a conventional V / V wiring protection mode for the single-phase transformer and a wiring mode for the single-phase transformer under an AT power supply mode in the high speed railway traction substation. The protective device is simple and has high performance and convenient maintenance.

Description

technical field [0001] The invention relates to the field of electrified railway traction power supply system. In particular, it relates to the field of single-phase transformer protection widely used in high-speed electrified sections. The invention realizes the protection, measurement and control functions of a dedicated single-phase traction transformer. Background technique [0002] High-speed railway has a history of 40 years in the world, but it is still in the planning stage in China. With the implementation of my country's "medium and long-term railway network planning", especially in the context of the global financial crisis, my country has added 2 One trillion yuan is used for railway construction, and my country's railway construction has ushered in a new round of peaks, among which high-speed railways have become the focus of railway construction. Compared with conventional railways, high-speed railways have higher speed and higher power, and AC-DC-AC electric ...

AI Technical Summary

Problems solved by technology

[0004] 1. Due to the need to consider and be compatible with transformer protection in various wiring forms at the same time, the software configuration is more complicated, and the transformer protection function is also completed by different devices, which makes the secondary wiring and drawing design more complicated, the cost is high, and the pertinence is not good. powerful;

[0005] 2. The V / V wiring is composed of 2 single-phase transformers. The main protection device or the backup protection device of the original 1 transformer must protect 2 single-phase transformers at the same time. The independent operation of the single-phase transformer cannot be realized. The maintenance of the transformer Maintenance is also inconvenient; the protection device cannot separate the protection and measurement circuits due to the limitation of the AC acquisition circuit, resulting in insufficient measurement accuracy

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