New high-voltage standby power supply connection method for gas-steam combined cycle power station

Abstract

The invention provides a new high-voltage standby power supply connection method for a gas-steam combined cycle power station. The new high-voltage standby power supply connection method comprises the following steps that: the high-voltage end of a standby transformer is connected with a GIS power distribution device, the low-voltage side of the standby transformer is connected to a standby section switch group through a pouring bus, the standby section switch group is respectively connected with a first unit and a second unit, one end of a first branch switch is connected with a bus incoming switch, and the other end is connected with the first unit and the second unit; and one end of a second branch switch is connected with the bus incoming switch, and the other end is connected with the first unit and the second unit. When a high-voltage standby transformer or a high-voltage standby transformer low-voltage side pouring bus is normally overhauled, if any element of a main transformer-high plant transformer-plant working power supply bus loop of one unit breaks down, the unit does not have a normal accident shutdown power supply, 'hand-in-hand 'station power interconnection can be achieved through the two units, and the other unit provides a shutdown overhauling power supply, thus on-grid electricity quantity is saved, and the created economic benefits are quite good.

Description

technical field [0001] The invention relates to the technical field, in particular to a novel high-voltage standby power lead-in method for a gas-steam combined cycle power station. Background technique [0002] As an important part of the gas-steam combined cycle power station, the utility power system has an important impact on the safe operation of the unit. In order to ensure the normal start and stop of the unit, an outlet circuit breaker is installed at the outlet of the gas turbine generator, and the power for unit start and normal stop is obtained from the power system through the main transformer. The power supply of the high-voltage service transformer is obtained from the T-connection between the outlet circuit breaker of the gas turbine generator and the low-voltage side of the gas turbine main transformer. Usually, two sets of units are specially equipped with one on-load voltage regulating double-winding high-voltage standby transformer, and the power supply o...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this scheme is that during the normal inspection and maintenance of the pouring bus on the low-voltage side of the high-standby transformer or high-standby transformer, if any component of the main transformer-high factory transformer-factory working power bus circuit of a unit fails, the unit does not have For normal accident shutdown power supply, only the diesel engine can be emergency started to supply power to the shutdown load

If the diesel generator fails to start, it will inevitably have a serious impact and damage on the safety shutdown of the whole plant and important process equipment.

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