Segmented spare power automatic switching device for bus hard connection main transformer low-voltage double-branch configuration and implementation method thereof

Abstract

The invention relates to a segmented spare power automatic switching device for bus hard connection main transformer low-voltage double-branch configuration and an implementation method thereof. The device comprises a voltage input configuration unit, a current input configuration unit, a switching value input configuration unit, a device tripping and closing output configuration unit and a devicepower supply, communication and signal output unit. Spare power switching can be used all the time when a main transformer low-voltage side is provided with double branch switches in different operation modes, the configuration requirement of corresponding main wiring spare power automatic switching after long-range No.3 main transformer expansion hard connection is removed is met, and field device configuration change and loop adjustment are facilitated.

Description

technical field [0001] The invention relates to the field of distribution network power supply, in particular to a segmented backup self-injection device with a bus hard-connected main transformer low-voltage double-branch configuration and an implementation method thereof. Background technique [0002] As an important device to improve the reliability of power grid power supply, the standby automatic switching device has increasingly high requirements for the reliability and adaptability of the standby automatic switching work under the circumstances that the current grid connection is increasingly close and the reliability of power supply is high. . At present, most infrastructure projects are in the initial stage of substation construction or expansion stage. Most #2 main transformers are equipped with double branches on the low-voltage side to supply 10kV II and III (or IV) busbars respectively. In order to realize the failure of #2 main transformer Therefore, during th...

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Problems solved by technology

[0003] According to the above-mentioned backup self-switching wiring mode of the fixed branch of #2 main transformer, when the first-hand car circuit breaker of the low-voltage side branch of the #2 main transformer has a problem during operation, the first-hand car circuit breaker of the low-voltage side branch is decommissioned, and the second-hand car circuit breaker of the second-hand car branch is put into operation. This wiring cannot meet the 10kV I and II stage standby automatic switching mode. At this time, the standby automatic switching exits synchronously; or when the two branches on the low-voltage side of the main transformer need to be operated alternately or the two branches run at the same time, it will also cause 10kV I and II Segment standby automatic switch out of operation

In this mode of operation, when any one of the main transformers fails and trips, it will cause the corresponding busbar to lose voltage, which greatly reduces the reliability of the grid power supply.

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