Processing method of double-bus single-section bus-couple CT wire break based on topological constraints

Abstract

The invention discloses a treatment method for CT disconnection of double-bus single-section bus tie based on topological constraints, which includes the following steps: (1) setting double-bus single-section wiring mode, and the protection range of the busbar protection device is I and II , III three-section busbar; (2) When the device is not interconnected, it is calculated that the large difference A phase difference flow is zero, and the I bus and II bus have a small difference A phase difference flow, indicating that the bus connection 1 between I and II bus occurs Phase A CT is disconnected, and the busbar protection device sends out an alarm signal of "bustie 1 CT disconnection"; (3) If the busbar 1 with CT disconnection is not adjacent to the busbar, that is, Phase III, a phase A fault occurs in the area, and all three buses have differential currents , After eliminating the influence of bus coupler 1, the device locks the I and II bus differentials, trips all branch circuit breakers on III bus, and removes the fault. In the present invention, after the 1CT of the bus coupler is disconnected, the bus protection device correctly responds to the fault in the area, does not expand the scope of fault power failure, does not accidentally trip the non-fault bus, ensures the safety of power consumption, and reduces the impact of the bus fault on the power grid system and users.

Description

technical field [0001] The invention relates to the field of busbar protection in relay protection, in particular to a treatment method for CT breakage of double-bus and single-section bus tie based on topology constraints. Background technique [0002] As a measuring device for primary circuit current information, current transformer (CT) is widely used in the power grid to provide raw data for power system relay protection equipment and ensure the safety of the power system. During the operation of the system, there will inevitably be a CT disconnection fault. After the bus coupler (section) CT is disconnected, according to the electrical characteristics of the large difference and no flow, and the small difference of the busbars on both sides of the bus coupler (section), there is flow. In the past, the busbar protection often adopts the following treatment methods: [0003] (1) The busbars on both sides of the busbar (section) with CT disconnection are treated as interc...

AI Technical Summary

Problems solved by technology

However, for the double-bus single-section wiring method, if a bus that is not adjacent to the CT disconnected bus (section) fails, the device will cut off the bus (section) of the non-faulty bus, which expands the fault range, changes the system structure, is not conducive to failure analysis

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