A controller of a transformer cooler and its control method

Abstract

The invention relates to a controller for a transformer cooler and a control method thereof. The controller comprises a case, at least three case clamp slots formed inside the case, a back panel arranged at the back of the case, and function modules plugged in the back panel through the case clamp slots in a one-to-one correspondence manner. Each function module includes a dual-power switch module, a main control module, and at least one motor start and protection module connected to the output terminal of the main control module, wherein the dual-power switch module and the main control module are successively connected. In addition, the control method also includes: power failure monitoring and displaying are carried out; hand-operated controlling of the cooler is carried out; and automatic controlling of the cooler is carried out. On the basis of control modularization of the transformer cooler, the cooler can be controlled independently; the live plugging and replacement of the modules are realized; the controller and the control method are suitable for controlling of all transformer coolers for maintenance; the types and number of the user spare parts are reduced; the centralized controlling is realized, the size is reduced, and the economic and practical effects are realized; the transformer cooler control as well as maintenance and management becomes convenient; and theblank of the transformer cooler controller is filled.

Description

technical field [0001] The invention relates to automatic control of a power transformer cooler, in particular to a controller of a transformer cooler and a control method thereof. Background technique [0002] At present, the coolers of domestic transformers use AC contactors as the main power actuators. After complex electrical connections, they are assembled into traditional electromagnetic and PLC intelligent cooling control cabinets for centralized control, and all coolers share a dual power switching circuit. In this way, the contactor of the dual power supply circuit carries a large current and is easy to generate heat, resulting in a high failure rate. When the fault needs to be replaced, due to the close connection with other circuits, it is easy to cause the failure of the cooler to stop completely, which will cause the transformer to trip and cause serious damage. Accidents; thermal relays are used as motor protection, the protection accuracy is not high, and the ...

AI Technical Summary

Problems solved by technology

[0002] At present, the coolers of domestic transformers use AC contactors as the main power actuators. After complex electrical connections, they are assembled into traditional electromagnetic and PLC intelligent cooling control cabinets for centralized control, and all coolers share a dual power switching circuit. In this way, the contactor of the dual power supply circuit carries a large current and is easy to generate heat, resulting in a high failure rate. When the fault needs to be replaced, due to the close connection with other circuits, it is easy to cause the failure of the cooler to stop completely, which will cause the transformer to trip and cause serious damage. Accidents; thermal relays are used as motor protection, the protection accuracy is not high, and the versatility is not strong, resulting in more types of spare parts, which brings inconvenience to management, and when troubleshooting occurs, it takes a lot of time and time to replace devices Most of them have to be operated in a power outage, which brings inconvenience to maintenance personnel and many other problems

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