Main Transformer Differential Protection Analysis System and Analysis Method

Abstract

The invention discloses a differential protection analysis system of a main transformer and an analysis method and relates to a differential protection theory value analysis method. At present, a method used for carrying out actual function check generally comprises the step of adding different current to different sides of the main transformer for checking and the possibility of a data check error is large. The differential protection analysis system comprises a basic information input module, a ratio brake differential action characteristic curve parameter processing module, a ration differential characteristic test point theory calculation module, a test result inputting and processing module, a test result storage and export module and a storage module. The method comprises the steps of firstly, randomly taking a point meeting the requirements from a differential characteristic curve and reversely deducing a critical theoretical value of a protection action according to the taken point; setting the added analogue quantity of a tester according to the calculated theoretical value and feeding back the actually measured value to a calculation system; and finally processing the calculation result. The pre-calculation process can be accelerated, the check data error or failure caused by a calculation error can be prevented and the efficiency is improved.

Description

technical field [0001] The invention relates to a method for analyzing theoretical values ​​of differential protection. Background technique [0002] The transformer is the core part of the substation, and the debugging of the main transformer protection is of great significance in the debugging process of the substation. The main protection in the main transformer protection is differential protection and non-electrical protection. In the smart substation, the non-electrical protection is configured locally, and the differential protection is configured in the intelligent main transformer protection device in the relay protection room. As the instantaneous main protection, differential protection is of great significance for protecting the main transformer from internal faults. The current principle of differential protection for main transformer protection is made by mainstream manufacturers. figure 1 The segmented polyline form shown. figure 1 The abscissa and ordinate...

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