Control circuit ground fault protection function detecting device and method

Abstract

The invention relates to a control circuit ground fault protection function detecting device and method. The device comprises a sampling module, a signal conditioning module, a processor and a step linear load circuit module, wherein the step linear load module comprises a plurality of power relays and a plurality of power resistors; the resistance values of the power resistors stepwise increase or decrease; the processor is connected to the step linear load module and is configured to control the plurality of power relays of the step linear load module to be successively switched off, therebyobtaining the corresponding ground leakage current when each power relay is switched off, and determining and displaying whether a control circuit ground fault protection function is normal or not according to the change trend characteristic of the ground leakage current. The method has a convenient operation process and is suitable for wide-area application. Various signals are directly acquiredand have high measurement precision and reliability.

Description

technical field [0001] The invention belongs to the technical field of circuit function detection, and in particular relates to a control circuit grounding fault protection function detection device and method. Background technique [0002] In the low-voltage electrical control system, the control circuit is generally composed of buttons, various electrical switches, protective electrical contacts, and control relays connected by wires. Two signals, so as to achieve the purpose of automatic control. The so-called ground fault of the control circuit refers to the control circuit under certain conditions, such as deformation of the electrical switch contact, failure of the wire insulation layer, high humidity in the surrounding environment, mistakes in the maintenance process, etc., which cause the electrical switch contacts or lines in the control circuit to fail. The phenomenon that the conductor is connected to the ground wire (Note: such as the metal casing of electrical ...

AI Technical Summary

Problems solved by technology

This method is a lossy test, which will cause the original short circuit of the control circuit, the overcurrent protection device or the main board of the control circuit to operate or burn out, resulting in unavoidable losses.

In addition, during the test process, the uncontrollable current generated by the short circuit may easily cause personal electric shock casualties, and the generated arcs and electric sparks may also easily cause fire accidents.

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