Transformer DC magnetic bias monitoring method and device
A DC bias and monitoring device technology, applied in the direction of measuring devices, instruments, measuring electricity, etc., can solve problems such as imprecise, inaccurate, and unscientific, and achieve the effect of improving accuracy
Active Publication Date: 2018-12-07
BEIJING GUOWANG FUDA SCI & TECH DEV
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Therefore, it is inaccurate, unscientific and imprecise to regard the transformer bias current as a pure DC current to evaluate the influence of DC bias on the transformer.
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[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0039] In the prior art, the existing DC bias measurement technology generally considers the transformer bias current as a pure DC current, collects a data point in several seconds to tens of seconds during the collection, and considers this data as the transformer bias current.
[0040] E.g, figure 2 It is the waveform trend chart of the neutral point current of a 500kV transformer in Shandong between 6 o'clock and 8 o'clock on March 27, 2016. ...
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The invention provides a transformer DC magnetic bias monitoring method and device, wherein the method comprises the following steps: measuring a mixed current signal at the grounded neutral point ofa main transformer by a current measuring device, wherein the current measuring device comprises a Hall element installed at the grounded neutral point of the main transformer, and the mixed current signal includes a DC magnetic bias current, a magnetic bias response current, and a power-frequency unbalanced current; analyzing the mixed current signal to determine the DC magnetic bias current andthe magnetic bias response current; and determining the magnetic bias response degree of the transformer based on the magnetic bias response current. The method can accurately detect and monitor the DC magnetic bias current flowing into the transformer when a DC system operates in a single-pole ground mode; and monitors the magnetic bias response degree of the transformer after the DC magnetic bias current flows into the transformer, thereby evaluating the influence of the magnetic bias on the transformer and further determining whether to take restraint measures.
Description
technical field [0001] The invention relates to the technical field of power transformer applications, in particular to a transformer DC bias monitoring method and device. Background technique [0002] In recent years, as more and more domestic DC transmission projects have been put into operation, the DC current flowing into the earth under the single-pole operation mode of DC transmission projects has become more and more commonly coupled with the AC transmission system. The specific coupling relationship is as follows: figure 1 shown. Monitoring shows that in AC transmission substations within 100 kilometers of the DC grounding pole, the main transformers whose neutral points are directly grounded are affected to varying degrees by the DC current flowing into the earth. This DC current flows from the earth to the neutral point of the transformer. Through the transformer and the AC transmission line network, part of the DC current that originally only passes through the e...
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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 郭志广郭哲贾跟卯高方玉郎庆凯郑鹏超于洪亮赵爽魏雷
Owner BEIJING GUOWANG FUDA SCI & TECH DEV