Longitudinal differential protection synchronization remote test method

Abstract

The invention discloses a longitudinal differential protection synchronization remote test method. The method specially comprises steps: 1, two relay protection testers with time synchronization analog output functions are adopted to be connected onto an M side and an N side of a substation respectively, and the relay protection testers are connected with a GPS receiving device; 2; the two relay protection testers are used for applying current analog to circuit longitudinal differential protection devices, and output current of the two testers has a phase difference of Delta phi=180 DEG; 3, current magnitudes at the M side and the N side and a corresponding phase relationship are displayed via the circuit longitudinal differential protection devices; 4, when differential current on the circuit longitudinal differential protection devices is larger than 100mA, a problem exists in differential protection on two sets of circuit longitudinal differential protection devices and data synchronization performance of sampling circuits of the circuit longitudinal differential protection devices; and 5, the phase difference phi MN of current at two sides of the circuit longitudinal differential protection device is calculated, and when the difference value between phi MN and Delta phi is in a range of +/-1.5 DEG, phase of the circuit longitudinal differential protection device is shown to be correct.

Description

technical field [0001] The invention relates to a remote testing method for synchronism of longitudinal differential protection in an electric power system. Background technique [0002] In the high-voltage power grid of 220kV and above, before the transmission line is put into normal operation, the relay protection and channel equipment at both ends of the line should be jointly debugged. The conventional test method is to complete the respective protection test and channel test on both sides of the line. However, in the testing and accident analysis of this kind of protection system, because the fault data cannot be added to both sides of the line at the same time, it is impossible to simulate the real short-circuit fault experiment, and the protection and channel joint debugging in the true sense cannot be realized. hidden failures are not discovered in time. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a...

AI Technical Summary

Problems solved by technology

However, in the testing and accident analysis of this kind of protection system, because the fault data cannot be added to both sides of the line at the same time, it is impossible to simulate the real short-circuit fault experiment, and the protection and channel joint debugging in the true sense cannot be realized. Hidden failures are not discovered in time

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