A detection method and device for a main contact fault of a high-voltage DC contactor

Abstract

The invention discloses a method for detecting faults of a main touch point of a high-voltage direct-current contact. Two ends of the main touch point of the direct-current contact are respectively connected with a piece of electric equipment and a first direct-current power supply; the electric equipment is connected with the first direct-current power supply; two ends of an auxiliary touch point of the direct-current contact are respectively connected with a dropping resistor and a second direct-current power supply; the dropping resistor is connected with the second direct-current power supply; the auxiliary touch point is linked with the main touch point; the method comprises the following steps of: when the first direct-current power supply needs to stop supplying power to the electric equipment, controlling to power off the voltages exerted to two ends of a direct-current contact coil; detecting the voltages at two ends of the auxiliary touch point; and if the voltages at the two ends of the auxiliary touch point are not set voltages, transmitting a first alarming signal to represent that the main touch point of the direct-current contact has adhesion faults. The invention also discloses a device for detecting the faults of the main touch point of the high-voltage direct-current contact.

Description

technical field [0001] The invention relates to the technical field of high-voltage direct current transmission, in particular to a detection method and device for a main contact failure of a high-voltage direct current contactor. Background technique [0002] A DC contactor is a control device that uses a low-voltage line to remotely control the switching on and off of a DC high-voltage line. Start, stop, reverse and reverse braking, which are also used to frequently switch on and off lifting electromagnets, solenoid valves, electromagnetic coils of clutches, etc. [0003] The working voltage of the DC contactor is relatively high. When the operating environment is harsh and the operation is frequent, the main contact is often stuck and unable to be disconnected due to mechanical fatigue or instantaneous arc. The main contact adhesion refers to the adhesion of the contacts that should be relatively movable due to metal melting, which is usually caused by two reasons: 1) In...

AI Technical Summary

Problems solved by technology

[0006] However, the existing technical solutions can only judge the faults such as open circuit and short circuit of the control circuit, and cannot monitor and judge specific faults such as the adhesion fault of the main contact of the relay or the mechanical jam fault, so the cause of the fault cannot be determined quickly and correctly and locate the fault location

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