A method for selecting the parameters of the neutral point grounding reactor of the converter transformer

Abstract

The invention discloses a parameter selection method for a neutral point grounding reactor of a converter transformer. The method can quickly select the reactance value X of the neutral point grounding reactor of a converter transformer according to a calculation formula N and rated thermal short-circuit current I N ; The parameters of the grounding reactor selected by this method can meet the requirements of the short-circuit current limit and the insulation level of the neutral point of the converter transformer at the same time, which makes the parameter selection of the grounding reactor more rapid, reasonable and effective.

Description

technical field [0001] The invention relates to the technical field of power transmission and transformation, in particular to a parameter selection method for a neutral point grounding reactor of a converter transformer. Background technique [0002] With the continuous expansion of the scale of the interconnected power grid, the connection of the power grid is getting closer and closer, and the short-circuit current continues to rise. Many domestic power grids have experienced a situation where the short-circuit current exceeds the breaking capacity of the switch. At present, the measures for excessive single-phase short circuit include the following three: first, replace the switch with a larger breaking capacity. This method has no inhibitory effect on the short circuit current. Current breaking requirements, but the replacement of switches usually involves a large number of investment, and will cause multiple substations to be in abnormal operation mode during the repla...

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Problems solved by technology

[0004] In the prior art, when limiting the excessive single-phase short-circuit current of the converter station in the DC transmission system, there is no general parameter selection specification for the neutral point grounding reactor of the converter transformer, and the method of trial and error is usually adopted. A parameter is randomly given in advance, and the simulation program is used to calculate and check whether the short-circuit current limit and the neutral point insulation of the transformer meet the requirements. First, the speed is slow and the efficiency is low; second, the simulation calculation under limited conditions cannot guarantee the installation of grounding Safety of Transformer Neutral Point Insulation After Reactor

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