Test method for lockout function of bus protective composite voltage

Abstract

The invention relates to a test method for the lockout function of the bus protective composite voltage, and belongs to the technical field of power system protection. Sequence components of positive-sequence low voltage, negative-sequence overvoltage and zero-sequence overvoltage of the composite voltage are set according to a fixed value of the bus protective composite voltage; three-phase voltage amplitude and phase angle are distributed by utilizing the symmetrical component principle, so that the different sequence components and protective logic behavior do not interfere with each other; and a fault quantity which satisfies the experiment requirements is calculated, and the lockout function of the bus protective composite voltage is tested according to the fault quantity. According to the bus protection standard, it is not required to modify the fixed value of the composite voltage sequence components, the three-phase voltage amplitude and phase angle are distributed by utilizing the symmetrical component principle, the different sequence components and protective logic behavior do not interfere with each other, and the fault quantity which satisfies the experiment requirements is calculated; and thus, the protection performance is tested and verified, and the test efficiency of onsite protectors is improved.

Description

technical field [0001] The invention relates to a method for testing the composite voltage blocking function of busbar protection, which belongs to the technical field of power system protection. Background technique [0002] Busbar protection is an important part of the relay protection of the power system. The busbar is an important device of the power system and plays a very important role in the entire power transmission and distribution process. Bus failure is a very serious failure in the power system. It directly affects the safe and reliable operation of all equipment connected to the bus. It may cause large-scale power outages or serious damage to equipment, causing system stability damage. For the entire power system is extremely harmful. With the continuous development of power system technology and the continuous increase of grid voltage level, the requirements for the speed, sensitivity, reliability and selectivity of busbar protection are also getting higher a...

AI Technical Summary

Problems solved by technology

The new six unified standards for busbar protection require that the low-phase voltage, negative-sequence and zero-sequence voltages of the voltage blocking components used for differential protection be set at 40V, 4V and 6V, which are respectively fixed in the protection and cannot be adjusted.

Since the positive-sequence low voltage, negative-sequence voltage, and zero-sequence voltage in the composite voltage are OR logic, they cannot be adjusted. It is very inconvenient to test and verify the blocking function of the composite voltage sequence component separately.

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