Under-voltage coil detection device and power distribution cabinet detection system

Abstract

The invention relates to an under-voltage coil detection device and a power distribution cabinet detection system. The device comprises a low-frequency voltage generation module, a protection impedance and a metering loop, the input end of the low-frequency voltage generation module is connected with a power supply end, and a first output end of the low-frequency voltage generation module is connected with one end of the protection impedance. The other end of the protection impedance is connected with a second output end of the low-frequency voltage generation module through an under-voltage coil and a metering loop; a working voltage is connected between a first wiring terminal of the under-voltage coil and a second wiring terminal of the under-voltage coil; the low-frequency voltage generation module is used for performing frequency conversion voltage reduction processing on the working voltage and inputting the working voltage to the protection impedance; the low-frequency alternating-current voltage is input to the first wiring terminal of the under-voltage coil through the protection impedance; and the metering loop is used for calculating a resistance value between the first wiring terminal and the second wiring terminal according to the voltage on the first wiring terminal, and determining whether an under-voltage coil exists in the to-be-detected circuit. The device can realize live detection of the under-voltage coil.

Description

technical field [0001] The present application relates to the technical field of undervoltage coil detection, in particular to an undervoltage coil detection device and a power distribution cabinet detection system. Background technique [0002] The undervoltage coil is used to realize undervoltage protection, and it can be used in conjunction with circuit breakers and other devices that control the on-off of the circuit. The circuit breaker can be closed to cut off the downstream power supply to protect the downstream electrical appliances. However, most of the undervoltage states in the line to be tested are instantaneous, and the undervoltage coil in the line to be tested will also cut off the downstream power supply in the state of instantaneous undervoltage, and frequent power outages will cause damage to downstream electrical appliances. Damage, so it is necessary to detect whether there is an undervoltage coil on the line to be tested. [0003] At present, the detec...

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