RCD (Residual Current Device) detection device and detection method

Abstract

The invention discloses an RCD (Residual Current Device) detection device. A detection circuit in the detection device can generate a simulation drain current on the basis of a first control signal output by a controller, and the processed simulation drain current is output to the controller, a differential current transformer can output a drain current obtained in the detection to a signal processing unit which can process and output the drain current to the controller, a trip circuit can generate a simulation voltage based on a second control signal output by the controller and can output the simulation voltage to the controller and a tripping device, and the controller can determine whether the differential current transformer and / or the signal processing unit has faults or not according to the comparison results of the simulation drain current and the drain current, and determine whether the trip circuit and / or the tripping device has faults or not according to the comparison results of the attenuation ratio of the simulation voltage with a preset attenuation ratio, cue signals denoting the detection results can be output to a detection result cue unit, and the detection result cue unit can output the detection results according to the obtained cue signals. The invention further discloses an RCD detection method. By adopting the RCD detection device and the detection method provided by the invention, an RCD (Residual Current Device) can be detected in the case of the connection of a circuit breaker with a power grid.

Description

technical field [0001] The invention relates to protector detection technology, in particular to an RCD detection device and detection method. Background technique [0002] In the low-voltage power grid, when the operator touches the live part of the electrical device, a leakage current will be generated, which may easily cause personal electric shock casualties; Current, the leakage current is likely to cause a short circuit in the line, and then cause a fire. When the above two situations occur, the power supply needs to be cut off to ensure safety. [0003] In the low-voltage power grid, installing a protector is an effective protective measure to prevent personal electric shock casualties, electrical fires and electrical equipment damage. A residual current device (Residual Current Device, RCD) is a protector that detects leakage current. The protector is installed on a circuit breaker. When the RCD detects that there is a leakage current in the low-voltage power grid,...

AI Technical Summary

Problems solved by technology

[0011] In order to realize the accurate detection of leakage current by RCD, the existing RCD detection method requires experienced operators to manually detect the internal circuit components of the RCD when the connection between the RCD and the low-voltage power grid is cut off; and each time the internal circuit components of the RCD are detected The interval time is long, and the failure of the internal circuit components of the RCD cannot be detected in a timely and effective manner.

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