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Impedance Matching Balance Transformer Protection

Author: HuangZhenNing
Tutor: GaoHouLei
School: Shandong University
Course: Proceedings of the
Keywords: Impedance matching balance transformer PSCAD / EMTDC Current differential protection Fault component
CLC: TM41
Type: Master's thesis
Year: 2008
Downloads: 187
Quote: 0
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Abstract

Rail transport is the main mode of transport industry, railway electrification systems Traction Transformer is an important electrical equipment, it's safe to run or not directly related to the railway electrification system can work continuously and stably. Matching balance transformer is to adapt to the development needs of the new electrified railway traction transformer, which has a better suppression of negative sequence current impact on the power system, higher capacity utilization, etc., has become China's electrified railway traction transformer primary wiring type. Therefore, in-depth study of the internal structure of the impedance matching balance transformer and protection principle, for speeding up China's high-speed electrified railway construction and development, the development of higher quality, more powerful, better performance of the protection device has very important significance. Text based on the internal structure of the transformer and electromagnetic relations, analyzes the basic properties matching balance transformer, operating principles and parameters derived from the primary side to the secondary side of the three-phase voltage converting two-phase equivalent circuit voltage, current discussion and voltage conversion coefficient values ??relationships and impedance matching, and then on the balance transformer fault state were analyzed, and the corresponding short-circuit current is calculated. This article briefly describes the conventional transformer protection problems faced and solutions, in a detailed analysis of the current balance transformer differential protection based on the principle, by comparing current and full current fault component differential sensitivity criterion, tried to propose a new type of component based on all current and fault current differential protection criterion combining and traction power supply system with the characteristics given based on the content of even harmonics inrush criterion, which to some extent, a better solution of the balancing transformers problems faced by the differential protection. In this paper, using PSCAD / EMTDC electromagnetic simulation software, built electrified railway traction power supply system model, through this model in normal operation status, fault status, and load switching inrush carried out under conditions such as a large number of simulations, a detailed analysis of impedance matching balun in a variety of operating conditions of the electrical characteristics of the waveforms harmony Potter volume, while for component based on all current and fault current differential protection criterion combines the sensitivity has been verified. Based on the study balancing transformer differential protection based on the outlines for the balun configuration microcomputer need to consider some other protection, and gives protection scheme logic diagram, making the balancing transformer protection as a whole, for the latter part of the hardware design to provide some theoretical basis.

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