Method and system for designing transient step loop parameters of direct-current current transformer

Abstract

The invention discloses a method and system for designing transient step loop parameters of a direct-current transformer, and the method comprises the following steps: 1, carrying out the direct current accuracy test of a shunt, and obtaining a direct current error Ez of the shunt; 2, calculating the real resistance Rz of the shunt; 3, performing a harmonic current accuracy test on the shunt to obtain a shunt N * i harmonic current error Exi; 4, calculating equivalent inductance Li corresponding to the N.i-th harmonic by using the real resistance Rz obtained in the step 2 and the N.i-th harmonic current error Exi obtained in the step 3; 5, calculating the equivalent inductance L of the shunt; and 6, calculating the parameters of the filter, and ending the design. On the basis of existing test equipment and means, the transient step test effect which cannot be carried out at present is achieved, the obtained shunt parameters provide a basis for accurate design of transient step loop parameters, and the method has universality and feasibility and can improve the design level and design efficiency of the direct-current electronic current transformer.

Description

Technical field [0001] The present invention belongs to the technical field of DC electronic transformer, and more particularly to the design method and system of transient step jumper parameters of DC current transformer. Background technique [0002] In the national standard "GB / T26216.1 high-voltage DC transmission system DC current measuring device Part 1: Electronic DC current measuring device", DC electronic current transformers used in high-voltage DC transmission systems, when step transformation The characteristics have the following requirements: the maximum overshoot <20%, the rise time, that is, 90% of the step value is less than 400Us, the time, that is, the amplitude error does not exceed the step value of 1.5%, less than 5 ms. [0003] In my country's special high voltage DC and flexible DC transmission systems, most current transformers are based on spliter principles. Such as image 3 As shown, it can be divided into three major parts: the splitter ST, the r...

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Problems solved by technology

[0007] In order to solve the deficiencies in the prior art, the purpose of the present invention is to provide a design method and system for the transient step circuit parameters of DC current transformers, how to Use the existing test methods to measure the equivalent inductance L, so as to facilitate the precise design of the filter device parameters in the remote module, so as to ensure that the transient step characteristics of the transformer meet the standard requirements

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