Transformer direct current magnetic bias online monitoring system

Abstract

The invention discloses a transformer direct current magnetic bias online monitoring system. The transformer direct current magnetic bias online monitoring system can monitor the direct current magnetic bias of a transformer. The transformer direct current magnetic bias online monitoring system comprises: a current collection device which is installed in a transformer neutral point loop and uses to collect a transformer neutral point direct current component in real time; a data processing unit connected with the current collection device and used for operating the direct current signal output by the current collection device; and a background monitoring center, wherein the operating result of the data processing unit is transmitted to the background in a data transmission mode for monitoring.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring of transformers, and in particular relates to an on-line monitoring system for DC bias magnetism of transformers. Background technique [0002] In recent years, as more and more DC transmission lines have been put into operation, DC bias is the main reason for the aggravation of transformer vibration. Although people have a certain understanding of the negative impact of the DC single Incidents of increased transformer vibration in DC transmission grids suggest that this 'impact' is larger than expected. From the field test data, it can be seen that the vibration noise and harmonics of the transformer increase with the increase of the neutral line DC current, and the size of the neutral line DC current is roughly the same as the DC line transmission power and DC line power in the single pole operation mode. related to the polarity of [0003] This phenomenon can be explained by the fa...

AI Technical Summary

Problems solved by technology

[0003] This phenomenon can be explained by the familiar saturation magnetization characteristics of the transformer core: the DC current flowing into the winding becomes part of the excitation current of the transformer, which makes the transformer core biased, changes the operating point of the transformer, and makes the original magnetization curve work As a result, the total excitation current becomes a peak wave, which eventually leads to an increase in transformer vibration; it will cause obvious increase in transformer vibration and noise, core heating, resonance and other problems, affecting the life of the transformer and safe production

Images