Transformer direct current magnetic bias monitoring sensor

Abstract

The present invention provides a transformer direct current magnetic bias monitoring sensor. The transformer direct current magnetic bias monitoring sensor comprises an open-close type shell, a split type amorphous alloy magnetic core and a control circuit board; the split type amorphous alloy magnetic core and the control circuit board are both arranged in the open-close type shell; the open-close type shell is provided with a mounting channel for mounting a transformer neutral point grounding bar; the split type amorphous alloy magnetic core is in matched connection with the inner surface of the open-close type shell; the control circuit board is arranged between the split type amorphous alloy magnetic core and the mounting channel; and the control circuit board is provided with a Hall effect chip, a filtering and amplifying circuit, a temperature and zero-drift correction circuit, an analog-to-digital conversion chip, a digital signal processing chip and a communication isolation and interface circuit, so that the Hall effect chip, the filtering and amplifying circuit, the temperature and zero-drift correction circuit, the analog-to-digital conversion chip, the digital signal processing chip, the communication isolation and interface circuit and the split type amorphous alloy magnetic core can jointly complete the acquisition, feature extraction, computing and digital processing of transformer magnetic bias direct current signals. The transformer direct current magnetic bias monitoring sensor of the invention is a special sensor designed for transformer magnetic bias direct current monitoring and can improve the efficiency and scientificity of transformer magnetic bias monitoring work.

Description

technical field [0001] The invention relates to the field of transformer monitoring, in particular to a transformer DC bias monitoring sensor. Background technique [0002] In recent years, as more and more direct current transmission lines have been put into operation, the problem of the impact of direct current transmission on AC transformers under the single-pole ground circuit and bipolar unbalanced operation mode has become increasingly prominent: it will cause the transformer vibration and noise to increase significantly, Problems such as iron core heating and resonance affect the life of the transformer and safe production. It has become the consensus of more and more experts and scholars to monitor and study the DC bias condition of the transformer so as to solve its influence on the transformer. [0003] In the related art, a DC clamp meter is used to monitor the transformer, but the DC clamp meter has great limitations and has many problems, such as a small calipe...

AI Technical Summary

Problems solved by technology

[0003] In the related art, a DC clamp meter is used to monitor the transformer, but the DC clamp meter has great limitations and has many problems, such as a small caliper that cannot adapt to a wider grounding bar, cannot measure according to the characteristics of the bias magnetic DC signal, and cannot be used for a long time Continuous measurement, unintuitive data reading, low efficiency and error-prone manual data recording and statistics, etc., so there is an urgent need for a professional automatic transformer bias DC monitoring device

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