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Self-healing optical current transformer

A technology of current transformers and current sensors, applied in inductors, voltage/current isolation, circuits, etc., can solve the problems of poor operation reliability, low measurement accuracy, and poor temperature stability, and achieve high reliability and measurement accuracy. High, good temperature stability effect

Inactive Publication Date: 2012-02-22
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention proposes a self-healing optical current transformer in order to solve the problems of low measurement accuracy, poor temperature stability and poor long-term operation reliability existing in the existing optical current transformer

Method used

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specific Embodiment approach 1

[0011] Specific implementation mode one: combine figure 1 Describe this embodiment, this embodiment is made up of optical current sensor 2, self-healing calibrator 3 and algorithm realization unit 4; Algorithm realization unit 4 is made up of digital signal demodulation module 4-1, power frequency filtering module 4-2 fault judgment module 4-3 and the coefficient correction module 4-4; the optical current sensor 2 and the self-healing corrector 3 are respectively installed on the power transmission bus 1, and the data signal output terminal of the optical current sensor 2 is connected with the digital signal solution in the algorithm realization unit 4 The data signal input end of the modulation module 4-1 is connected, the first signal output end of the digital signal demodulation module 4-1 is connected with the second signal input end of the power frequency filter module 4-2, and the digital signal demodulation module 4-1 The second signal output end of the self-healing cor...

specific Embodiment approach 2

[0012] Specific implementation mode two: combination Figure 8 Describe this embodiment. The difference between this embodiment and the specific embodiment is that the self-healing calibrator 3 is composed of a light-load coil module 3-1, a sampling resistor module 3-2, a high-voltage power supply module 3-3, and a high-voltage side circuit 3- 10 and the low-voltage side circuit 3-11; the high-voltage side circuit 3-10 is composed of an overvoltage protection circuit 3-4, a bias circuit 3-5, a frequency modulation circuit 3-6 and a high-voltage electro-optical conversion circuit 3-7; the low-voltage side The circuit 3-11 is composed of a low-voltage electro-optical conversion circuit 3-8 and a signal demodulation circuit 3-9; the signal input end of the light-load coil module 3-1 is the signal input end of the self-healing calibrator 3, and the light-load coil module 3-1 The signal output terminal of 1 is connected to the signal input terminal of the sampling resistor module 3...

specific Embodiment approach 3

[0013] Specific implementation mode three: combination figure 2 Describe this embodiment, the difference between this embodiment and the specific embodiment is that the optical current sensor 2 is composed of an optical current sensing unit 2-1, a light source 2-2, a photodetector 2-3 and an analog signal processing circuit 2-4 The light emitting end of the light source 2-2 is connected with the light incident end of the optical current sensing unit 2-1, the signal output end of the optical current sensing unit 2-1 is connected with the signal input end of the photodetector 2-3, and the photoelectric The data signal output end of the detector 2-3 is connected with the data signal input end of the analog signal processing circuit 2-4, and the data signal output end of the analog signal processing circuit 2-4 is the data signal output end of the optical current sensor 2. Other compositions and connection methods are the same as those in Embodiment 1.

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Abstract

The invention discloses a self-healing optical current transformer, which relates to a current transformer and is disclosed so as to solve the problems that a traditional optical current transformer has low measurement accuracy, low temperature stability and low reliability after running for a long time. An optical current sensor and a self-healing corrector are arranged on an electric power transmission bus; the data signal output ends of the optical current sensor and the self-healing corrector are respectively connected with the data signal input ends of a digital signal demodulation module and a power frequency filtering module in an algorithm realizing unit; the signal output end of the digital signal demodulation module is respectively connected with the signal input ends of the power frequency filtering module and a factor correction module; and the data signal input end and the data signal output end of a fault judgment module are respectively connected with the data signal output end of the power frequency filtering module and the data signal input end of the factor correction module. The self-healing optical current transformer has the advantages of high measurement accuracy, high temperature stability and high reliability.

Description

technical field [0001] The invention specifically relates to a current transformer. Background technique [0002] Modern power systems require current transformers with accurate measurements, safe insulation and digital outputs. Due to the magnetic circuit saturation problem of traditional electromagnetic current transformers, the transient measurement accuracy cannot meet the requirements of protection control and dynamic observation; the insulation safety is not ideal, and insulation safety failures occur from time to time; problems such as analog output have been Can not meet the needs of digital power system construction. With the development of modern optical fiber technology and electronic technology, it has become an inevitable trend for electronic current transformers to replace traditional electromagnetic current transformers. [0003] At present, there are two main types of electronic current transformers: air-core coil electronic current transformers and optical...

Claims

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Application Information

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IPC IPC(8): H01F38/28H01F38/32G01R15/18G01R15/24
Inventor 郭志忠于文斌张国庆路忠峰申岩王贵忠孙如京
Owner HARBIN INST OF TECH
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