Online monitoring device for grounding current of transformer core

Abstract

The invention relates to an online monitoring device for grounding current of a transformer core. The online monitoring device comprises a monitoring device body and a straight-through current transformer. The monitoring device body comprises a totally closed electromagnetic interference preventing housing. The external surface of the totally closed electromagnetic interference preventing housing is provided with a liquid crystal display screen and a device state indicating lamp. The totally closed electromagnetic interference preventing housing is internally provided with a signal acquiring and processing module, a communication module and a display interface module. The signal acquiring and processing module comprises a signal conditioning module, a digital-to-analog conversion circuit and a microprocessor unit. The signal conditioning module comprises a signal conversion circuit, a filter circuit and a signal amplification circuit. According to the online monitoring device, the straight-through current transformer is utilized for acquiring a leakage current signal of a grounding line of the transformer core, and a plan that the totally closed electromagnetic interference preventing housing and the current transformer are separately arranged is utilized. The online monitoring device has advantages of accurate and reliable monitoring data, high outer interference resistance and high convenience in mounting and maintenance.

Description

technical field [0001] The invention relates to a grounding current detection device for power equipment, in particular to an on-line monitoring device for the grounding current of a transformer iron core, which belongs to the field of power equipment monitoring. Background technique [0002] As users have higher and higher requirements for power supply reliability, the safe and stable operation of the power grid is becoming more and more important. The power transformer is the "heart" of the power grid. Ensuring the normal operation of transformers, early detection of accident symptoms, and targeted emergency repairs to minimize various losses caused by accidents are related to the comprehensive social and economic benefits of power grid enterprises. At present, the country is vigorously developing the intelligent power grid, and the online monitoring system of the transformer iron core is a relatively important part of the intelligent grid. Through the online monitoring o...

AI Technical Summary

Problems solved by technology

[0004] The present invention discloses a new scheme for the on-line monitoring device for the grounding current of the transformer iron core, which uses a through-core current transformer to collect leakage current signals, and adopts a monitoring device body set in a fully enclosed anti-electromagnetic interference casing and a separate setting from the current transformer outside the casing On the basis of ensuring the precision and accuracy of the measurement data of the monitoring device and finding faults in time, the solution enhances the ability of the monitoring device to adapt to the external harsh operating environment, improves the convenience of the installation and maintenance of the whole device, and solves the problem of the existing monitoring device. Poor interference ability, inconvenient installation and maintenance

Images