Electric motor control protector

Abstract

This invention discloses an electromotor control defender, which is series jointed with working circuit of the electromotor, including: breaker; contactor; current monitoring module; controlling and protective module that connects to the monitoring module, the breaker and the contactor, and also to the computer network. The controlling and protective module receives the signal outputted by the current monitoring module and transforms it into the numeral signal and calculates, and receives control order from the computer network, combines the result based on the numeral signal calculation and the instruction produced by the received control order to outputs them to the breaker and the contactor; the controlling and protective module also receives the working state signal of the breaker and the contactor and transmits up to the computer network.

Description

technical field [0001] The invention relates to a motor protection device, more specifically, to a motor control and protection device integrating protection, control and communication functions. Background technique [0002] At present, the short circuit, overload, phase failure protection and frequent intelligent control of motors at home and abroad are generally realized by separate components. Since each component can only realize part of the functions, the following types are often used Combination method: [0003] Communication breaker + contactor + thermal relay (motor protector) (1) [0004] Or: circuit breaker+contactor+communicating motor protector (2) [0005] Or: circuit breaker + communicable contactor + thermal relay (motor protector) (3) [0006] It can be seen from the above combination methods that in devices composed of separate components, especially in communicable devices, often only one of the several separate components has a communication function....

AI Technical Summary

Problems solved by technology

[0008] Obviously, using method (4), not only a large amount of communication data is repeated (such as line current and other information will be repeatedly sampled and recorded in three communicable appliances), but also duplication and waste are caused in hardware (for example, there may be three Current transformers for collecting current signals), in addition, the coordination and cooperation between the protection characteristics of the three components cannot be guaranteed

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