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All-fiber electronic current transformer frequency characteristic testing device and testing method

A frequency characteristic test, current transformer technology, applied in the direction of measuring devices, instruments, measuring electrical variables, etc., can solve problems such as the inability to apply all-fiber electronic current transformers, achieve long-term stability and good repeatability, meet the frequency band , the effect of convenient frequency adjustment

Active Publication Date: 2014-06-04
STATE GRID CORP OF CHINA +3
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Problems solved by technology

[0005] The output of the all-fiber electronic current transformer is a digital signal. Compared with the traditional transformer, the former has undergone major changes in principle, structure and output mode. The existing test methods for the traditional current transformer cannot be applied to All-fiber electronic current transformer

Method used

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  • All-fiber electronic current transformer frequency characteristic testing device and testing method
  • All-fiber electronic current transformer frequency characteristic testing device and testing method
  • All-fiber electronic current transformer frequency characteristic testing device and testing method

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Embodiment Construction

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

[0039] Firstly, the basic principle and mathematical model of the closed-loop operation of the all-fiber current transformer are introduced.

[0040] like figure 1As shown, the light emitted by the light source 1 passes through the coupling beam splitter 2 and reaches the polarizer 3 for polarization, and then passes through 45 . polarized beam splitter 4, and modulated by a square wave in the modulator 5, and converted into two beams of linearly polarized light at the same time, after passing through the fiber d...

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Abstract

Provided are an all-fiber electronic current transformer frequency characteristic testing device and a testing method. The testing device comprises a control calculation and display unit, a frequency response control unit and an equal ampere-turn current raising device. The control calculation and display unit is used for generating reference data and control instructions to drive the frequency response control unit and receive test data from the frequency response control unit. The frequency control unit is used for variable alternating current signals with variable frequency and size variable currents; under the control of a synchronous clock, the frequency control unit collects digitalized output signals of a data interface of a current transformer, and the collected output signals of the tested current transformer are formatted and then are transmitted to the control calculation and display unit. The equal ampere-turn current raising device is used for further raising the variable alternating current signals through an equal ampere-turn method, and the variable alternating current signals are applied to the tested current transformer. According to the testing device, large-range frequency regulation can be carried out conveniently, signals are accurate and stable, and the requirements of the fiber current transformer which has the characteristics of being wide in frequency band and large in dynamic range and the requirement of quantity transmission are met.

Description

technical field [0001] The invention relates to the technical field of all-fiber electronic current transformer testing, in particular to a frequency characteristic testing device and a testing method of an all-fiber electronic current transformer. Background technique [0002] The transformer is an important device for obtaining measurement and protection signals in the power system. As the power capacity transmitted by the power system is getting larger and the voltage level is getting higher and higher, the traditional transformer also presents its own insurmountable problems due to its sensing mechanism, mainly reflected in poor safety performance and poor dynamic measurement accuracy. , The insulation structure is complex, DC cannot be measured, there are many metal consumables, high energy consumption, large floor space, and environmental pollution caused by waste gas and oil. At present, almost every country in the world is facing the pressure of environmental, resou...

Claims

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Application Information

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IPC IPC(8): G01R35/02
Inventor 张勤叶国雄张志鑫郭克勤刘彬童悦王利清潘俏屹刘翔胡蓓黄华谭金权李彬刘东伟万罡冯翔翔杨帆陈鹏邓小聘熊俊军
Owner STATE GRID CORP OF CHINA
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