Relay protection action delay time grading test system and method

Abstract

The invention discloses a relay protection action delay time grading test system and method on the basis of Rogowski coil transient simulation. The system comprises an upper computer and a test host computer; the upper computer is provided with a data source generating module and a delay time test module; the test host computer comprises a master controller, a data generating module, a data acquisition module, a D / A module, an A / D module and an acquisition interface module. According to the system and method, firstly, a transient simulation model of the Rogowski coil under electrical power system failure conditions is established by the data source generating module, and then transient simulation data is sent to the test host computer in real time; differential small analog quantity signals are sent to a collector through the data generating module and the D / A module to establish whole interval dynamic analog data; at the same time, the small analog quantity signals are used as a standard source, and then serial data signals, merged unit 9-2 data, digital relay protected GOOSE data and intelligent terminal switching values are collected, and therefore, a whole set of test system is established; a delay time of those signals relative to the transient standard source and an overall action delay time can be tested.

Description

technical field [0001] The invention relates to the technical field of relay protection detection, in particular to a relay protection action delay classification test system and method based on Rogowski coil transient simulation. Background technique [0002] As an important part of smart grid, smart substation is the main direction of grid construction at present. During the construction of smart substations, Rogowski coil electrical and electronic transformers have been applied to a certain extent. The basic principle of Rogowski coil to measure current is Faraday's law of electromagnetic induction and Ampere's loop law. Rogowski coil is an air-core coil made of non-magnetic material as the skeleton. In the air-core coil, the secondary winding is on the non-magnetic skeleton without ferromagnetic material. This sensor has good linearity, no saturation and no hysteresis, so the air-core coil has excellent frequency response capability. However, the voltage e(t) of the se...

AI Technical Summary

Problems solved by technology

This method relies on high hardware test conditions and high investment, and it is necessary to build a system physical dynamic model laboratory, which basically makes it impossible to test the operating time characteristics of digital relay protection based on the transient data of electronic transformers.

The delay characteristics of electronic transformers are basically measured under steady state conditions, which cannot directly reflect the overall operating time of digital relay protection based on electronic transformers

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