Inlet wire emergency power supply automatic switch-in control method and system

Abstract

The invention discloses an inlet wire emergency power supply automatic switch-in control method which is used for a sectionalized single-bus configuration circuit in a transformer substation, wherein the circuit comprises a first busbar, a second busbar, a bus coupler switch which is located between the first busbar and the second busbar and capable of controlling the connection and disconnection of the two sections of busbars, an inlet wire emergency power supply automatic switch-in device, a first main transformer connected with the first busbar, and a second main transformer connected with the second busbar; the method comprises the steps of after the first main transformer or the second main transformer does protective actions, judging whether the bus coupler switch is switched off, if yes, the inlet wire emergency power supply automatic switch-in device is controlled to act, and an emergency power supply starts to supply power; otherwise, the inlet wire emergency power supply automatic switch-in device is controlled to do no action, and the emergency power supply does not come into use. The method has less influence on the normal running of the transformer substation, and does not affect the safety of power grid and equipment. The invention also discloses an inlet wire emergency power supply automatic switch-in control system.

Description

technical field [0001] The invention relates to the field of automatic input control of standby power supply, in particular to a method for automatic input control of incoming line standby power supply. The invention also relates to an automatic input control system of incoming standby power supply. Background technique [0002] The current 110kV substation mostly uses a single-bus section wiring circuit. In order to ensure the reliability of power supply, the circuit is generally equipped with an automatic input device for incoming line backup power. , the device can control the standby power supply into the circuit, avoiding the situation of power failure of the whole station. [0003] see figure 1 as shown, figure 1 It is a schematic diagram of a single-bus section wiring circuit in a substation. The circuit includes a bus tie switch that divides a single bus into the first bus and the second bus and can control the connection or disconnection between the two bus sect...

AI Technical Summary

Problems solved by technology

[0004] When a fault occurs in the single bus section wiring circuit (for example, the first bus fails), it will cause the protection action of the first main transformer or the second main transformer, and the protection action will control the bus tie switch and the active main transformer. The line switch on the connected incoming line is disconnected, resulting in no current on the incoming line. Since the charging condition of the automatic input device for the incoming line backup power supply in the prior art is not met at this time, the backup power supply will not be put in, that is, the other line The line switch on the incoming line will not be closed, so there is no current on the other incoming line, resulting in a power outage in the entire substation at this time, affecting the normal operation of the substation

[0005] If the bus tie switch refuses to operate, since the bus tie switch is closed at this time, the backup power supply will supply power, but the fault in the line still exists at this time, which will cause the faulty line to be connected to the backup power supply, thus causing the single bus segment wiring circuit to fail. The second-stage protection action, that is, the switch on the opposite side of the incoming line of the circuit will jump off, which will cause impact on the power grid and line switch, thus affecting the safety of the power grid and equipment

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