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Differential protection device based on Faraday magneto-optical effect

A differential protection device, Faraday magneto-optical technology, applied in the direction of automatic disconnection emergency protection device, emergency protection circuit device, measuring device, etc., can solve problems such as large error components

Active Publication Date: 2016-06-29
HARBIN INST OF TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing differential protection device will generate a large error component in the differential operation and cannot accurately judge the internal fault and external fault in the protection zone, and provides a protection device based on the Faraday magneto-optical effect. Differential protection device

Method used

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  • Differential protection device based on Faraday magneto-optical effect
  • Differential protection device based on Faraday magneto-optical effect
  • Differential protection device based on Faraday magneto-optical effect

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specific Embodiment approach 1

[0014] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the differential protection device based on the Faraday magneto-optical effect described in this embodiment, it includes a light source 1, a first multimode optical fiber 2a, a second multimode optical fiber 2b, a first optical current sensor 3, a polarization maintaining optical fiber 4. The second optical current sensor 5 and the electronic processing unit 6;

[0015] The first optical current sensor 3 and the second optical current sensor 5 are arranged at both ends of the protection interval 7 in the power system, and the light beam emitted by the light source 1 is sent to the first optical current sensor 3 through the first multimode optical fiber 2a. The optical signal output end of the first optical current sensor 3 is connected to the optical signal input end of the second optical current sensor 5 through the polarization maintaining optical fiber 4, and the optical si...

specific Embodiment approach 2

[0017] Specific implementation mode two: the following combination figure 1 This embodiment will be described. This embodiment will further describe the first embodiment. The first optical current sensor 3 includes a first multimode fiber collimator 11a, a polarizer 12, a first Faraday magneto-optical element 13a and a first protection Polarizing fiber collimator 14a; The second optical current sensor 5 includes a second polarization-maintaining fiber collimator 14b, a second Faraday magneto-optical element 13b, a polarizer 15 and a second multimode fiber collimator 11b;

[0018] The polarizer 15 of the second optical current sensor 5 is arranged at an angle of 45° relative to the polarizer 12 of the first optical current sensor 3;

[0019] The light signal sent by the light source 1 is sent to the first multimode fiber collimator 11a of the first optical current sensor 3 through the first multimode fiber 2a, and the first multimode fiber collimator 11a injects the received li...

specific Embodiment approach 3

[0020] Specific implementation mode three: the following combination figure 1 This embodiment will be described. This embodiment will further describe the second embodiment. The current i 1 The direction flowing from the inner side to the outer side of the protection zone 7 is positive, and the current i 2 The direction of flow from the inner side to the outer side of the protection zone 7 is positive.

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Abstract

The invention discloses a differential protection device based on a Faraday magneto-optical effect, relating to a differential protection device, belonging to the field of relay protection of a power system. According to the differential protection device, the problems that large error components can be generated in differential operation and an internal fault and an external fault inside a section can not be accurately judged in an existing differential protection device. The differential protection device comprises a light source, a first multimode fiber, a second multimode fiber, a first optical current sensor, a polarization maintaining optical fiber, a second optical current sensor and an electronic processing unit; the first optical current sensor comprises a first multimode optical fiber collimator, a polarizer, a first Faraday magnetic-optical element and a first polarization maintaining collimator; and the second optical current sensor comprises a second polarization maintaining optical fiber collimator, a second Faraday magnetic-optical element, a polarization analyzer and a second multimode optical fiber collimator. The differential protection device is used in relay protection of the power system.

Description

technical field [0001] The invention relates to a differential protection device, which belongs to the field of relay protection of electric power systems. Background technique [0002] At present, the relay protection device in the power system transmits the current information detected by the conventional electromagnetic current transformer to the relay protection device in the form of an electrical signal, and the calculation and calculation of the fault criterion are carried out in the relay protection device. The result is judged. The purpose is to reduce the cost and weight of the relay protection device. (Japan) Patent Application No. 2000-59987 and Patent Application No. 11-224821 propose a protective relay device based on a photocurrent sensor with a differential operation function to replace the existing current measurement method based on a winding-type current converter . The relay protection device described in this patent only uses the differential current s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/28G01R19/00
Inventor 于文斌张国庆宋平黄华炜张朝阳郭志忠申岩王贵忠
Owner HARBIN INST OF TECH
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