A relay protection action blocking motor starter

Abstract

The invention discloses a relay protection action blocking motor starting device, which includes a table program controller, the input end of the table program controller is electrically connected with the protection action output contact of the microcomputer comprehensive protector of the motor; The comprehensive protector of the model includes a protection action blocking module and a fault reset module, and the protection action blocking module and the fault reset module are electrically connected; a high-voltage switch cabinet closing circuit, and the high-voltage switch cabinet closing circuit is connected to the fault The reset module and the output terminal of the table program controller are electrically connected; 24VDC power module, the positive pole of the 24VDC power module is electrically connected with the positive pole of the program controller, and the negative pole of the 24VDC power module is electrically connected with the negative pole of the table program controller. even. The beneficial effect of the present invention is to avoid the need for manual reset each time after the motor trips due to minor faults or loads, resulting in waste of human resources and delaying the time for restarting the motor, which affects the continuity of the production process of the enterprise.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a relay protection action blocking motor starter. Background technique [0002] In the power system, the function of the relay protection device is to automatically, quickly and selectively remove the fault from the power system when the protected component fails, to ensure the normal operation of other equipment, and to prevent the faulty component from being further damaged. For the motor, when the running motor trips due to a fault, the operator of the production unit cannot understand the cause of the trip because the comprehensive protector is installed in the substation, and may start the motor repeatedly, causing the motor to The degree of damage is aggravated. When the situation is serious, it may cause an impact on the entire power system and affect the stable operation of the power system. Therefore, when the motor trips due to a fault, th...

AI Technical Summary

Problems solved by technology

[0002] In the power system, the function of the relay protection device is to automatically, quickly and selectively remove the fault from the power system when the protected component fails, to ensure the normal operation of other equipment, and to prevent the faulty component from being further damaged. For the motor, when the running motor trips due to a fault, the operator of the production unit cannot understand the cause of the trip because the comprehensive protector is installed in the substation, and may start the motor repeatedly, causing the motor to The degree of damage is aggravated. When the situation is serious, it may cause an impact on the entire power system and affect the stable operation of the power system. Therefore, when the motor trips due to a fault, the motor should be prohibited from starting again or the number of repeated starts should be limited according to the nature of the fault. Currently, the most widely used The relay protection device is a microcomputer comprehensive protection device, and the functions of different brands of comprehensive protectors are also different. Among the comprehensive protectors put on the market, only a few brands have the function of "protection action blocking", and most of the comprehensive protectors do not. With this function, when the motor fault trips, it is impossible to prohibit the motor from starting again. At the same time, there is a drawback in the existing comprehensive protection device protection blocking function, which cannot distinguish the fault situation. All faults will be blocked and started as long as they are activated once. The substation can only start up again after the fault reset of the comprehensive protector. There are many cases where the motor over-current protection action trips due to load fluctuations on site. In this case, the motor is allowed to restart 1 or 2 times. It needs to be reset, which is time-consuming and labor-intensive, especially for production devices with high requirements for continuous production, which also has a great impact on the continuity of the production process

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