Automatic switching device for economic operation of power transformer

Abstract

The invention provides an automatic switching device for the economic operation of a power transformer, comprising a current signal detection circuit, a current signal judgment processing circuit, a time-delay circuit, a transformer switch-in closing circuit and a transformer switch-off tripping circuit; wherein the current signal detection circuit is connected with the current signal judgment processing circuit; the current signal judgment processing circuit outputs a large fixed value termination point and a small fixed value termination point which are respectively connected with the transformer switch-in closing circuit and the transformer switch-off tripping circuit through the time-delay circuit; when the current detection circuit detects that a current value exceeds a set large fixed value, the closing circuit is started in a time-delay way, and a transformer is automatically switched in for operation; and when a small fixed value is detected, the tripping circuit is started in a time-delay way, and the transformer is automatically switched off for the operation. The automatic switching device can accurately automatically finish the switching in time according to a set economic operation way of the transformer, be used for the parallel operation of the transformer and the operation of a main transformer and a sub-transformer, reduce the complex and heavy switching operation and the misoperation of workers and the operation loss of a power grid and enhance the enterprise and society benefits.

Description

technical field [0001] The invention relates to an automatic switching device for economical operation of power system transformers, which is applied to automatic switching of two or more transformers with two or three windings of various voltage levels in the power system in parallel for economical operation. Background technique [0002] At present, two or more power transformers of various voltage levels in the power system are required to have parallel operation conditions, and the running transformers are required to be connected in parallel. It is cut off from the power grid, and other transformers continue to operate and supply power; second, it can improve the economical efficiency of transformer operation, and the number of transformers put into parallel operation can be adjusted according to the load to improve operating efficiency; , install new transformers in batches. [0003] However, at present, the switch-on and withdrawal operations of transformers operatin...

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Problems solved by technology

[0005] In order to achieve the above purpose, the present invention provides an automatic switching device for transformer economical operation, which over

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