Motor-dual-protection automatic control device

Abstract

The invention discloses a motor temperature protection device and especially relates to a motor-dual-protection automatic control device. A first branch is formed by an experiment button SB, a stop button SR, a contactor KM, a normally-closed contact 2KV-1 of a relay 2KV, a normally-closed contact 4KV-1 of a relay 4KV and a normally-closed contact FR-1 of a thermal relay FR, wherein the experiment button SB, the stop button SR, the contactor KM, the normally-closed contact 2KV-1 of the relay 2KV, the normally-closed contact 4KV-1 of the relay 4KV and the normally-closed contact FR-1 of the thermal relay FR are successively connected in series from a U phase of a three-phase power supply; the first branch is connected to a W phase of the three-phase power supply. The experiment button SB is connected in parallel with a normally-open contact KM-4 of a contactor KM, a normally-open contact 1KV-2 of an intermediate relay 1KV and a normally-open contact 3KV-2 of an intermediate relay 3KV. A second branch is formed by a contact 1SP-1 of a first electric contact air pressure gauge, a normally-closed contact KV-1 of the contactor KM and the intermediate relay 1KV, wherein the contact 1SP-1 of the first electric contact air pressure gauge, the normally-closed contact KV-1 of the contactor KM and the intermediate relay 1KV are successively connected in series from an anode of a direct-current power supply; the second branch is connected to a cathode of the direct-current power supply. By using the device of the invention, when one electric contact meter is damaged, a standby electric contact meter is rapidly used so that equipment is guaranteed not to be damaged easily and production reliability is increased.

Description

technical field [0001] The invention relates to a motor temperature protection device, in particular to a motor dual protection automatic control device. Background technique [0002] When the motor continues to run under overload, phase loss, jamming, etc., the motor continues to run. If the running motor cannot be stopped quickly, the insulation of the motor stator coil is easily damaged. [0003] Oil and gas pressurized motors are in normal operation, such as turbine governor motors, which are equipped with two motor electric pressure gauges. When a pair of contacts of the first electric contact pressure gauge is damaged, the protection circuit cannot be quickly protected, resulting in adjustment When the speed system fails at low oil pressure or high oil pressure, the motor of the speed control system will be damaged or the governor will lose the working oil pressure, resulting in the loss of protection of the hydroelectric generator, which will easily cause the runaway ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an automatic control device with dual protection for the motor, which solves the problem that the current automatic control device for oil and gas pressurized motors is not fully protected and cannot ensure timely and fast stop of the motor when a fault occurs

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