GOOSE-based grounding mode synergistic control conversion method and system

Abstract

The invention discloses a GOOSE-based grounding mode synergistic control conversion method. The GOOSE-based grounding mode synergistic control conversion method comprises the steps of 1, inputting a grounding small resistor in a delay way when a grounding fault occurs, and simultaneously giving out a small resistor input GOOSE signal; 2, performing zero-sequence overcurrent distinguishing of each circuit, automatically tripping to isolate the fault, and simultaneously giving out a small resistor removal GOOSE signal; 3, performing bus fault distinguishing, wherein the step of performing bus fault distinguishing is simultaneously performed with the step 2; and 4, receiving the small resistor removal GOOSE signal to rapid removal the small resistor. The invention also discloses a GOOSE-based grounding mode synergistic control conversion system. By the GOOSE-based grounding mode synergistic control conversion method, rapid distinguishing can be performed and the fault circuit is automatically isolated when a permanent grounding fault occurs, no action is needed when an instantaneous grounding fault occurs, the advantage of high power supply reliability of a small-current grounding system is maintained, automatic switching of the small resistor can be rapidly achieved, the small resistor is short in inputting time, and the risk that the small resistor is heated and burnt is effectively prevented.

Description

technical field [0001] The invention relates to a grounding fault protection method for power transmission and distribution in a power system, in particular to a grounding mode conversion method. Background technique [0002] In the 3-66kV voltage level system of my country's power grid, the neutral point generally adopts a small current grounding method, including neutral point non-grounding, arc-suppression coil grounding, and high-impedance grounding. The above three methods are also called "neutral point indirect grounded" or "neutral not effectively grounded". The characteristic of the low-current grounding system is that when a single-phase grounding fault occurs, no short-circuit loop is formed, the fault current is basically a capacitive current, and the value is small, and the three-phase line voltage of the system remains symmetrical, and there is no obvious impact on normal power consumption in a short time. Affected, it can run for 1-2 hours with faults. Therefo...

AI Technical Summary

Problems solved by technology

However, 80% of the single-phase ground faults are instantaneous ground faults, all of which are directly tripped, which will cause frequent power outages and reduce the reliability of power supply

In theory, instantaneous ground faults can be remedied by automatic reclosing, but for urban power grids, cables are the mainstay, and automatic reclosing operations cannot be performed. Therefore, the small resistance grounding system is more reliable in power supply than the small current grounding system. decreased in sex

[0006] To sum up, the current low-current grounding system and low-resistance grounding system have their own advantages, but there are also some problems that are difficult to solve by themselves.

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