All-fiber current transformer and half-wave voltage correction method thereof

Abstract

The invention relates to an all-fiber current transformer and a half-wave voltage correction method thereof, and belongs to the technical field of power system automation. The correction method comprises the following steps: before operation, acquiring emergent light in real time, and calculating a light intensity value of the emergent light and an additional light intensity difference, wherein the extra light intensity difference is the difference between the light intensity value of the first transition period after 2[pi] overflow and the light intensity value of the last transition period before 2[pi] overflow; and taking the extra light intensity difference as zero as a target, correcting the half-wave voltage, completing the initialization process, obtaining a corrected half-wave voltage value, and taking the corrected half-wave voltage value as the initial half-wave voltage during operation to measure the current. Before the current is measured by the all-fiber current transformer, the half-wave voltage is corrected by taking zero extra light intensity difference as a target, and the initialization process is completed. If the deviation of the half-wave voltage is large, correction of the half-wave voltage is completed before measurement, so that the measurement efficiency and accuracy of the current are improved.

Description

technical field [0001] The invention relates to an all-fiber current transformer and a half-wave voltage correction method thereof, belonging to the technical field of power system automation. Background technique [0002] The current transformer is one of the most critical power transmission and transformation equipment in the power system. It is widely used in relay protection, current measurement and power system analysis. With the rapid development of the power system, the traditional electromagnetic induction current transformer has continuously exposed a series of shortcomings: poor insulation performance, low resistance to electromagnetic interference, small dynamic range, narrow frequency band, unable to measure DC, etc., it is difficult to meet the new requirements. The development needs of a generation of power system on-line detection, high-precision fault diagnosis, and power grid digitization. [0003] Therefore, it is urgent to develop new electrical measureme...

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Problems solved by technology

[0006] The purpose of this application is to provide a half-wave voltage correction method for an all-fiber-optic current transformer, which is used to solve the problem of low accuracy and low efficiency of correcting the half-wave voltage while measuring the current in the existing method when the deviation of the half-wave voltage is large At the same time, it also provides an all-fiber-optic current transformer to solve the problem of low accuracy and low efficiency when the half-wave voltage is corrected while measuring the current in the existing all-fiber-optic current transformer when the half-wave voltage deviation is large

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