Real-time on-line remote monitoring transformer iron core current device

Abstract

The invention provides a real-time on-line remote monitoring transformer iron core current device, which comprises a leakage current sensor (1) used for collecting a current analog signal and an alarm signal of a transformer iron core; the current analog signal is converted into a digital signal via a data collection cabinet (2); and the digital signal and the alarm signal are uploaded to a monitoring and managing device (4) via serial equipment (3). According to the device, the operation state of an electric reactor iron core is comprehensively and visually monitored and is intelligently analyzed in real time to provide more precise, timely and integrated information; the working efficiency is improved, and the labor intensity of workers is lightened; meanwhile, effective technical support is provided for the condition overhaul of the transformer; the grid security maintenance level and the disaster prevention and reduction capability can be improved.

Description

technical field [0001] The invention relates to a transformer current monitoring device, in particular to a real-time online remote monitoring transformer iron core current device. [0002] Background technique [0003] The power transformer is the most important electrical equipment in the power system. Once a fault occurs during operation, it will cause serious consequences to the power system. The iron core of a transformer in normal operation is grounded at one point. If two or more points are grounded at the same time, a current loop will be formed between the iron core and the earth. The maximum current can reach dozens of amperes, which will cause the iron core to overheat or even burn out. [0004] At present, to judge whether there is multi-point grounding in the transformer iron core, the previous monitoring methods are the regular monitoring and recording by testers using handheld instruments, the electrical method of regularly monitoring the grounding current o...

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Problems solved by technology

[0003]The power transformer is the most important electrical equipment in the power system. Once a fault occurs during operation, it will cause serious consequences to the power system

The iron core of a normal operating transformer is grounded at one point. If two or more points are grounded at the same time, a current loop will be formed between the iron core and the earth. The maximum current can reach dozens of amperes, which will cause the iron core to overheat or even burn out.

[0004] At present, it is judged whether there is multi-point grounding in the iron core of the transformer. In the past, the monitoring method is that the tester uses the handheld instrument to monitor and record regularly, and the clamp ammeter regularly monitors the iron core. The electrical method of grounding current, the method of measuring the insulation resistance of the iron core to the ground, and the gas chromatography analysis method of monitoring the characteristic gas of the transformer insulating oil, but these methods cannot detect the multi-point grounding fault of the iron core in time, and once a fault occurs, it is impossible to take corresponding measures in time. measure

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