Detection test device for thermal overload relay characteristics and control method

Abstract

The invention relates to a detection test device for thermal overload relay characteristics and a control method. The detection test device comprises an industrial personal computer, a contactor control circuit, a motor regulating circuit, a main circuit and a relay control circuit, wherein the contactor control circuit and the motor regulating circuit are controlled by the industrial personal computer; the main circuit is arranged as a 220V power supply which is connected with a primary coil of a voltage regulator; a secondary coil of the voltage regulator is connected with the primary coil of a transformer through two normally open contacts of the contactor; hollow mutual inductors are respectively arranged on the tap sides at different levels on the secondary coil of the transformer; the hollow mutual inductors are connected with the industrial personal computer. The detection test device has the advantages that the current is automatically stabilized; the output scope of the current-stabilizing power is wide; the ratio of the maximal output to the minimal output is 300; the device can automatically time after the ending of the current stabilization; after the sample acts, the action time is automatically recorded and the test result is kept; the device is safe and reliable; the speed is high and the current stabilizing precision can reach 1%; the scope of current output is wide; the current is automatically adjusted, the time is recorded and the test result is stored in the test process.

Description

technical field [0001] The invention belongs to a relay characteristic detection test device, in particular to a thermal overload relay characteristic detection test device and a control method. Background technique [0002] Thermal overload relay is an important low-voltage protection electrical appliance, which is widely used in the field of motor protection. It uses the thermal effect of current to protect the motor from overload and reflect the overload and heating state of the controlled equipment. Its operational reliability is related to the normal operation of the protected equipment. If it fails, it will have an important impact on users and even cause major economic losses. Therefore, the efficiency and accuracy of thermal overload relay detection equipment are particularly important. At present, the current output width of the equipment for testing the characteristics of thermal overload relays is small, and it is manually operated, such as adjusting current, re...

AI Technical Summary

Problems solved by technology

At present, the current output width of the equipment for testing the characteristics of thermal overload relays is small, and it is manually operated, such as adjusting current, recording time, saving data, etc., which leads to increased manpower and time input when testing product characteristics. In addition, manual adjustment Current error is large, more than 5%

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