Method for Detecting Additional Dynamic Component of Rogowski Coil Electronic Current Transformer

Abstract

The invention discloses a method for detecting an additional dynamic component of a Rogowski coil electronic current transformer. The Rogowski coil electronic current transformer includes a Rogowski coil, a collector and a merging unit; it also includes a digital / analog converter and a broadband amplifier, It includes the steps of constructing the Rogowski coil model and the equivalent load model of the collector; the steps of constructing the power grid simulation model; the steps of connecting the automatic scanning test device; the steps of performing the automatic scanning test at the time when the GPS second pulse is sent out; and repeating after a delay Automated scanning of the test steps. Utilize the method proposed by the present invention, can simulate various transient phenomena of the transmission line current, detect the dynamic response behavior of the Rogowski coil electronic current transformer, in order to test the ability of the Rogowski coil electronic current transformer to adapt to the operation requirements of the substation, and improve the technology performance helps.

Description

technical field [0001] The invention relates to the technical field of intelligent substation testing, and relates to a method for detecting the additional dynamic component of a Rogowski coil electronic current transformer. Background technique [0002] Smart substations use electronic current transformers to convert the current of high-voltage transmission lines into digital signals for use in substation relay protection devices. Electronic current transformers based on the principle of Rogowski coils have been applied in smart substations in my country. [0003] figure 1 A typical block diagram of a Rogowski coil electronic current transformer is given. In the figure, the primary current i passing through the Rogowski coil induces a voltage signal u proportional to the differential of the primary current on the Rogowski coil, and the collector performs filtering processing and analog / digital conversion on the voltage signal output by the Rogowski coil The digital signa...

AI Technical Summary

Problems solved by technology

[0004] Operation practice has proved that during live operation of the transmission line, additional dynamic components that do not exist in the transmission line current i may appear in the measurement signal i' of the Rogowski coil electronic current transformer, and this additional dynamic component may cause the relay protection device to malfunction

[0005] At present, the detection method research and instrument development are mainly aimed at the delay characteristics and accuracy characteristics of electronic current transformers when measuring power frequency signals at home and abroad. There are no reports on the causes and detection methods of the additional dynamic components of electronic current transformers.

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