Relay protection system and method

Abstract

The invention provides a relay protection system and method. The system comprises a relay, a resistance sampling circuit and a control unit, wherein the resistance sampling circuit is connected with the relay and is used for acquiring a first resistance value of a corresponding coil when the relay is switched off and a second resistance value of the corresponding coil when the relay is switched on; the control unit is connected with the resistance sampling circuit, and is used for receiving the first resistance value and the second resistance value sent by the resistance sampling circuit, calculating the actual working temperature of the coil according to the first resistance value, the second resistance value and the current environment temperature of the relay during working, and realizing the protection of the relay according to the actual working temperature. In the system, the current actual working temperature of the relay coil is judged by detecting the resistance change of therelay coil, so that when the actual working temperature reaches an alarm, corresponding cooling treatment can be carried out in time, the relay is effectively protected, and the possibility that the relay is damaged due to the fact that the working temperature is too high is prevented.

Description

technical field [0001] The invention belongs to the technical field of relays, in particular to a relay protection system and method. Background technique [0002] With the increase in the demand for explosion-proof items of household appliances using refrigerants such as air conditioners and refrigerators, the demand for explosion-proof devices is also increasing year by year. Among them, the explosion-proof of relays is divided into open-hole and sealed explosion-proof, while for high-current relays, only sealed ones can be used. Explosion-proof, however, along with the sealing and explosion-proof, the heat dissipation performance of the relay decreases, and the decrease of the heat dissipation performance of the relay will cause the working temperature of the relay to rise, and when it rises to a certain temperature value, it will cause damage to the relay. [0003] At present, the existing relay system does not have the function of monitoring the working temperature of t...

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Problems solved by technology

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a relay protection system and method, which is used to solve the problem in the prior art when the operating temperature of the relay is too high due to the inability to obtain the actual operating temperature of the relay in real time. Failure to detect and cool down in time, resulting in damage to the relay

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