Transformer grounding wire alternating current and direct current component detection device

Abstract

The invention relates to a transformer grounding wire alternating current and direct current component detection device. The device comprises current sensors, a collector and a display terminal; the current sensors comprise a plurality of TMR magneto-sensitive current sensors; the TMR magneto-sensitive current sensor array is installed in a protection shell in an array manner; the collector comprises a sampling circuit, a main control unit and an edge computing terminal; the TMR magneto-sensitive current sensors are electrically connected with the input end of the sampling circuit; the output end of the sampling circuit is electrically connected with the input end of the main control unit; and the main control unit is connected with the edge computing terminal and the display terminal. The plurality of TMR magneto-dependent current sensors realize measurement of alternating current and direct current components, higher harmonics and magnetic bias signals. With the TMR magneto-dependent current sensors adopted, the problem that a conventional current sensor is low in parameter monitoring precision and the like can be solved.

Description

technical field [0001] The invention relates to the technical field of measuring and calculating AC and DC components of a transformer grounding wire, in particular to a detection device for AC and DC components of a transformer grounding wire. Background technique [0002] At present, a combination of electromagnetic induction coil and Hall sensor is used to monitor the AC and DC conditions at the ground line of the transformer. For example, patent document CN 205015382U discloses a transformer neutral point DC component detection device. However, they have complex structures, high power consumption, and high field failure rate. On the one hand, the engineering application is complex, and the operation and maintenance workload is large. On the other hand, the Hall sensor application has low precision, poor interchangeability, signal changes with temperature, and nonlinear output. The reason is that the monitoring accuracy of parameters such as AC, DC and harmonics is low, ...

AI Technical Summary

Problems solved by technology

However, they have complex structures, high power consumption, and high field failure rate. On the one hand, the engineering application is complex, and the operation and maintenance workload is large. On the other hand, the Hall sensor application has low precision, poor interchangeability, signal changes with temperature, and nonlinear output. The reason is that the monitoring accuracy of parameters such as AC, DC and harmonics is low. The above problems are not conducive to the lean management requirements of equipment.

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