Dry type transformer-used intelligent protection system based on filter-type alarming circuit

Abstract

The invention discloses a dry type transformer-used intelligent protection system based on a filter-type alarming circuit, which is characterized by mainly comprising a microprocessor, an A / D converter, a storage unit, a display, an alarming circuit and a power supply connected with the microprocessor, a protection circuit connected with the power supply, a filter circuit connected with the protection circuit, a fan motor connected with the filter circuit, and a temperature sensor connected with the A / D converter, wherein the protection circuit is composed of an over current protection circuit whose input end is connected with the step-down circuit and a buffer circuit whose input end is connected with the over current protection circuit and the output end is connected with the filter circuit. The structure is simple and the cost is low; as the protection circuit is arranged between the power supply and the fan motor, the fan motor can be protected from being burnt down; as the alarming circuit is arranged, alarming is carried out when the temperature of the dry type transformer exceeds; and promotion and applications are facilitated.

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 filtering 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 filter alarm circuit that can monitor the temperature of the transformer and protect the fan motor

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