Method for applying a phase-fault overload protection device of isolating switch motor drive mechanism

Abstract

The invention discloses a method for applying a phase-fault overload protection device of a motor with an isolating switch motor driven operating mechanism, which comprises the following steps that: a secondary electric control system of the operating mechanism is divided into two parts, namely a motor circuit and a control circuit; lines A, B and C of the motor circuit pass through three mutual inductor holes of the phase-fault overload protection device respectively, and the symmetry degree of current is transmitted to the phase-fault overload protection device through the induction of a mutual inductor for the motor circuit; and lines D and E of the control circuit are connected to two connection points of the phase-fault overload protection device, and the phase-fault overload protection device controls current of the control circuit. If the current is asymmetrical, namely the current lacks phase and the current exceeds a normal range, the phase-fault overload protection device can automatically cut off a power supply to eliminate potential safety hazard.

Description

technical field [0001] The invention relates to a method for isolating a phase loss and overload protection device of a motor operating mechanism of a switch motor. Background technique [0002] At present, the common high-voltage isolating switch motor operating mechanism motor used in the market does not have phase loss protection, and the power-off time for overload is also relatively long, generally around 12 seconds. Since the motor operating mechanism is the main power to control the opening and closing of the high-voltage isolating switch and the grounding switch, when the high-voltage isolating switch and the grounding switch do not adopt effective electrical locking, if the operator of the substation accidentally misoperates, due to the ordinary high-voltage isolation The above-mentioned shortcomings of the switch motor operating mechanism motor, at this time, there is a mechanical lock between the isolation switch and the grounding switch, which causes the motor to...

AI Technical Summary

Problems solved by technology

Since the motor operating mechanism is the main power to control the opening and closing of the high-voltage isolating switch and the grounding switch, when the high-voltage isolating switch and the grounding switch do not adopt effective electrical locking, if the operator of the substation accidentally misoperates, due to the ordinary high-voltage isolation The above-mentioned shortcomings of the switch motor operating mechanism motor, at this time, there is a mechanical lock between the isolation switch and the grounding switch, which causes the motor to be blocked. , causing great security risks

At the same time, when the mechanical transmission parts of the high-voltage isolating switch are stuck, due to the above-mentioned shortcomings of the electric operating mechanism, the motor will also be blocked and burned, and the large locked-rotor torque will also damage the product components.

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