Monitoring system of transformer iron core current

Abstract

The invention discloses a monitoring system of transformer iron core current. The system comprises a zero-flux CT current sensor, the zero-flux CT current sensor is arranged at a ground copper bar ofa main transformer iron core, and the current sensor is fixed by welding and installing a bracket at the ground copper bar of the main transformer iron core, and then the ground copper bar penetratesthe sensor inner diameter; the signal conversion is performed on the current sensor through a signal preprocessing circuit in order, a current signal is collected through a collection circuit, and then the signal is transmitted to a control circuit; the control circuit transmits the signal to a storage circuit to store, the control circuit is connected with a display at the same time, and the signal is displayed through a display. The current detection of the main transformer iron core is performed through the zero-flux CT current sensor, the installation is convenient and the measurement is precise; the detected signal is preprocessed and converted, and then transmitted to the collection circuit, and then the signal is displayed through the display circuit; the storage circuit stores thecurrent signal data, and the monitoring is convenient.

Description

technical field [0001] The invention relates to a transformer detection system, in particular to a transformer core current monitoring system. Background technique [0002] There are many reasons for transformer faults, and there are many types of transformer faults. Relevant data statistics show that the proportion of faults caused by iron core problems accounts for the third of all kinds of faults in transformers. Therefore, it is necessary to prevent the occurrence of transformer core faults to the greatest extent, and to detect and deal with them in time to ensure the safe and reliable operation of the entire power system. [0003] When the power transformer is in normal operation, the iron core must be reliably grounded at one point. If there is no grounding, the floating potential of the core to the ground will cause intermittent breakdown and discharge to the ground. After the core is grounded at one point, the possibility of forming the floating potential of the co...

AI Technical Summary

Problems solved by technology

However, when the core is grounded at two or more points, the uneven potential between the cores will form a circulating current between the grounding points, and a sudden increase in the current will appear on the grounding line.