Method for realizing circuit optical fiber longitudinal differential protection by matching electronic mutual inductor and electromagnetic mutual inductor

Abstract

The invention relates to a method for realizing circuit optical fiber longitudinal differential protection by matching an electronic mutual inductor and an electromagnetic mutual inductor, comprising: (1) current phasors of optical fiber longitudinal differential protection devices at the sides of the electronic mutual inductor and the electromagnetic mutual inductor are detected; if the current phasors of the two optical fiber longitudinal differential protection devices are correct, the step (2) is executed, or the current circuits of the two optical fiber longitudinal differential protection devices are adjusted again; (2) angular difference of the two side current is read in the optical fiber longitudinal differential protection device at the side of the electronic mutual inductor, and time-delay compensation constant value is calculated; (3) the obtained time-delay compensation constant value is input into the optical fiber longitudinal differential protection device at the side of the electronic mutual inductor, and current occurrence time on an actual transmission line can be obtained by using the optical fiber longitudinal differential protection device to subtract the time-delay compensation constant value, thus completing the process of realizing the circuit optical fiber longitudinal differential protection by matching the electronic mutual inductor and the electromagnetic mutual inductor. The method can calculate sampling time delay of three links which are a collector, a communication transmission unit and the merging unit for realizing time-delay compensation, and has the characteristic of simple and effective implementation method.

Description

Technical field [0001] The invention belongs to the field of digital substations, in particular to a method for realizing line optical fiber longitudinal differential protection through the cooperation of an electronic transformer and an electromagnetic transformer. Background technique [0002] At present, the digital substation with primary equipment intelligence, secondary equipment networking, and communication platform standardization as the main features represents the future development direction of substations. The intelligence of primary equipment is embodied in electronic transformers and smart switches with digital output; the networking of secondary equipment is embodied in the communication of the upper and lower secondary equipment through the network; the standardization of communication platform is embodied in the IEC61850 standard. [0003] Transformers are important devices that provide current / voltage signals for electric energy metering, measurement, control, pr...

AI Technical Summary

Problems solved by technology

In the above processing process, there will be a sampling delay from the three links of the collector, communication transmission and merging unit, which will cause the problem of synchronous realization of the line optical fiber vertical difference protection coordinated by the two transformers

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