Dry-type transformer intelligent protection system based on buck alarm circuit

Abstract

The invention discloses a dry-type transformer intelligent protection system based on a buck alarm circuit. The system is characterized by mainly comprising a microprocessor, an A/D converter, a storage unit, a display, an alarm circuit and a power source which are connected with the microprocessor, a buck circuit which is connected with the power source, a protection circuit which is connected with the buck circuit, a fan motor which is connected with protection circuit, and a temperature sensor which is connected with the A/D converter, wherein the protection circuit is composed of an over-current protection circuit of which the input end is connected with the buck circuit, and a buffer circuit of which the input end is connected with the over-current protection circuit and the output end is connected with the fan motor. The dry-type transformer intelligent protection system is simple in structure and low in cost. The protection circuit arranged between the power source and the fan motor can protect the fan motor from burnout. The alarm can be raised through the alarm circuit when the temperature of a dry-type transformer exceeds a threshold. The dry-type transformer intelligent protection system is suitable for promotion and application.

Description

technical field [0001] The invention relates to a protection system, in particular to an intelligent protection system for a dry-type transformer based on a step-down alarm circuit. Background technique [0002] Dry-type transformers are widely used in local lighting, high-rise buildings, airports, wharf CNC machinery and equipment, etc. Dry-type transformers need to consume a lot of electric energy during work, and these electric energy will be converted into heat energy, which will increase the temperature of dry-type transformers. high. In order to protect the dry-type transformer and prolong the service life of the transformer, it is usually necessary to use a fan to dissipate heat from the transformer. At the same time, a temperature controller is required to monitor the temperature of the transformer. The currently used temperature controller is directly electrically connected to the fan. When the fan motor fails, it is easy to burn out the temperature controller, an...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the defect that the temperature controller is easily burned out when the fan motor of the dry-type transformer used at present fails, thus bringing great economic pressure to the user, and to provide a device that is not only simple in structure, but also low in cost. An intelligent protection system for dry-type transformers based on a step-down alarm circuit that can monitor the temperature of the transformer and protect the fan motor

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