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Modulation type optical current transducer and method thereof for measuring alternating current and direct current

A current transformer and modulation type technology, applied in the field of modulation type optical current transformer and its measurement of AC and DC current, to achieve the effects of improving measurement accuracy, preventing pollution and ensuring measurement accuracy

Active Publication Date: 2011-11-16
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0003] Aiming at the deficiency that the frequency band of the measured DC current overlaps with the noise of the optical measurement system mentioned in the above background technology, the present invention proposes a modulation-type optical current transformer and its method for measuring AC and DC currents

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  • Modulation type optical current transducer and method thereof for measuring alternating current and direct current
  • Modulation type optical current transducer and method thereof for measuring alternating current and direct current
  • Modulation type optical current transducer and method thereof for measuring alternating current and direct current

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Embodiment Construction

[0039] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0040] The invention provides a modulated optical current transformer and a method for measuring AC and DC currents, which eliminates the defect of frequency band noise overlapping when measuring DC currents, and further improves the measurement accuracy of the optical DC current transformer.

[0041] The light emitted by the intelligent modulation light source is divided into two beams of light through the pre-optical splitter. The two beams of light are modulated lights with a center frequency far away from the photoelectric noise frequency band. One optical signal enters the optical path of the magneto-optical sensor. The optical signal output by the optical path enters the downstream photoelectric converter, and th...

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Abstract

The invention discloses a modulation type optical current transducer and a method thereof for measuring alternating and direct current in the technical field of high-voltage circuit current measurement of electric power systems. The current transducer comprises an intelligent modulation light source, a front light splitter, a forward photoelectric converter, a magneto-optical sensing circuit, a backward photoelectric converter and an intelligent photoelectric demodulator, wherein light emitted by the intelligent modulation light source is divided into two beams of light through the front light splitter, one beam of light passes through the magneto-optical sensing circuit and is introduced into the backward photoelectric converter, while the other beam of light is connected to the forward photoelectric converter; electric signals of the backward photoelectric converter and the forward photoelectric converter are input into the intelligent photoelectric demodulator; and a feedback photoelectric signal can be input into the intelligent modulation light source by the intelligent photoelectric demodulator. By utilizing the modulation type optical current transducer, the influences of environmental temperature, unstable light source output and other factors are overcome, and the measurement accuracy of the optical current transducer is improved.

Description

technical field [0001] The invention belongs to the technical field of current measurement of high-voltage lines in power systems, and in particular relates to a modulated optical current transformer and a method for measuring AC and DC currents. Background technique [0002] The current transformer is an important equipment for power system measurement and protection control. After long-term development, the accuracy of the electromagnetic current transformer in measuring the steady-state current can reach a few ten thousandths, or even higher; but in the case of a short-circuit fault, the electromagnetic current transformer Severe magnetic saturation occurs in the relay, which leads to the distortion of the secondary output current waveform and cannot describe the transition process of the short-circuit current. This is one of the main reasons for the relay protection to malfunction and refuse to operate. In the future, the monitoring and control of the power system will m...

Claims

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Application Information

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IPC IPC(8): G01R15/18G01R15/24G01R19/00
Inventor 刘君李岩松
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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