On-site acquisition type optical fiber type current measuring device

Abstract

The invention relates to the technical field of current detection equipment, in particular to an on-site acquisition type optical-fiber current measuring device. The device comprises a light source, apolarization maintaining optical fiber beam splitter, a detector and a sensing light path used for measuring current. The light source is connected with an optical signal input end of the polarization maintaining optical fiber beam splitter, an optical signal of a first optical signal output end of the polarization maintaining optical fiber beam splitter passes through the sensing optical path and returns, and the returned optical signal is transmitted to the detector from a second optical signal output end of the polarization maintaining optical fiber beam splitter; the signal output end ofthe detector is connected with the processor; the signal output end of the processor is connected with the light source, and the working current of the light source is adjusted according to the errorbetween the actual optical power and the standard optical power, so that the actual optical power received by the detector falls within the set range of the standard optical power, the accuracy of thedetection result of the detector is improved, and the reliability of the current measuring device is obviously improved; in addition, a manual adjustment mode is avoided when problems occur, so thatthe current measuring device is convenient to operate and manage.

Description

technical field [0001] The invention relates to the technical field of current detection equipment, in particular to an on-site collection type optical fiber current measurement device. Background technique [0002] DC measurement devices have always been the core unit in conventional DC and flexible power transmission systems. Currently, they are mainly divided into two types of measurement devices: shunts and all-fiber current transformers. All-fiber current transformers are widely used in various fields because of their fast response speed, large dynamic measurement range, and wide frequency response range. With the continuous increase in the number of all-fiber current transformers put into operation, some problems have gradually become prominent. [0003] In particular, the failure rate of the optical fiber loop is high, and the optical fiber loop is the physical basis for the all-fiber optic current transformer to realize current transmission, which directly affects i...

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Problems solved by technology

[0005] The purpose of the present invention is to provide an on-site collection type fiber optic current measuring device to solve the problem that the current all-fiber current measuring device is affected by temperature changes or optical fiber aging, resulting in inaccurate detection results and low reliability of the current measuring device. bad question

[0006] In order to realize the light source control of the fiber-optic current measuring device, solve the problem that the existing all-fiber-optic current measuring device is affected by temperature changes or optical fiber aging, which leads to inaccurate detection results and poor reliability of the current measuring device; The ground-collecting fiber-optic current measurement device includes a light source, a polarization-maintaining fiber splitter, a detector and a sensing optical path for measuring current. The light source is connected to the optical signal input end of the polarization-maintaining fiber splitter, and the polarization-maintaining fiber splitter The optical signal at the first optical signal output end of the beam splitter passes through the sensing optical path and returns, and the returned optical signal is transmitted from the second optical signal output end of the polarization-maintaining optical fiber beam splitter to the detector; the signal output end of the detector is connected to A processor, the signal output end of the processor is connected to the light source, and the working current of the light source is adjusted according to the error between the actual optical power and the standard optical power, so that the actual optical power received by the detector falls within the set range of the standard optical power , where the standard optical power is the optical power corresponding to the optimal signal-to-noise ratio of the matching detector

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