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Photoelectricity and CT (Computed Tomography) mixed differential protection system and method for isolation transformer

An isolation transformer and differential protection technology, which is applied in the direction of measuring electrical variables, emergency protection circuit devices, instruments, etc., can solve the problems of transformer excitation inrush braking and differential protection misoperation, etc., and achieve the solution of excitation inrush braking, easy Realize and judge the effect of simple method

Active Publication Date: 2015-03-11
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Discontinuous corner braking will also cause differential protection misoperation due to discontinuous corner deformation
[0005] Therefore, a new method is needed to identify the excitation inrush current, so as to finally solve the problem of excitation inrush current braking of transformer differential protection

Method used

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  • Photoelectricity and CT (Computed Tomography) mixed differential protection system and method for isolation transformer
  • Photoelectricity and CT (Computed Tomography) mixed differential protection system and method for isolation transformer
  • Photoelectricity and CT (Computed Tomography) mixed differential protection system and method for isolation transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] like figure 1 , a photoelectric CT hybrid isolation transformer differential protection system, the system includes a primary side unit, an isolation transformer, a secondary side unit, a secondary protection system, a system incoming line, a system outgoing line, and a circuit breaker; a system incoming line and a system The outgoing lines are respectively connected to the primary side and the secondary side of the isolation transformer through the primary side unit and the secondary side unit. Both the primary side unit and the secondary side unit are connected to the secondary protection system. between side units.

[0058] The primary side unit includes the first all-fiber optic current transformer OCT1 and the first electromagnetic current transformer CT1; the first all-fiber optic current transformer OCT1 is used to measure the current of electrical equipment, and is wound on the primary side of the isolation transformer through optical fibers On the incoming lin...

Embodiment 2

[0069] like Figure 4 , a photoelectric CT hybrid isolation transformer differential protection system, the system includes a primary side unit, an isolation transformer, a secondary side unit, a secondary protection system, a system incoming line, a system outgoing line, and a circuit breaker; a system incoming line and a system The outgoing lines are respectively connected to the primary side and the secondary side of the isolation transformer through the primary side unit and the secondary side unit. Both the primary side unit and the secondary side unit are connected to the secondary protection system. between side units.

[0070] The primary side unit includes the first all-fiber optic current transformer OCT1 and the first electromagnetic current transformer CT1; the first all-fiber optic current transformer OCT1 is used to measure the current of electrical equipment, and is wound on the primary side of the isolation transformer through optical fibers On the incoming li...

Embodiment 3

[0081] like Image 6 , a photoelectric CT hybrid isolation transformer differential protection system, the system includes a primary side unit, an isolation transformer, a secondary side unit, a secondary protection system, a system incoming line, a system outgoing line, and a circuit breaker; a system incoming line and a system The outgoing lines are respectively connected to the primary side and the secondary side of the isolation transformer through the primary side unit and the secondary side unit. Both the primary side unit and the secondary side unit are connected to the secondary protection system. between side units.

[0082] The primary side unit includes the first all-fiber optic current transformer OCT1 and the first electromagnetic current transformer CT1; the first all-fiber optic current transformer OCT1 is used to measure the current of electrical equipment, and is wound on the primary side of the isolation transformer through optical fibers On the incoming lin...

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PUM

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Abstract

The invention provides a photoelectricity and CT (Computed Tomography) mixed differential protection system and method for an isolation transformer. The system comprises a primary-side unit, the isolation transformer, a secondary-side unit, a secondary protection system, a system incoming line, a system outgoing line and a circuit breaker, wherein the system incoming line and the system outgoing line are respectively connected to a primary side and a secondary side of the isolation transformer through the primary-side unit and the secondary-side unit; the primary-side unit and the secondary-side unit are respectively connected with the secondary protection system; the circuit breaker is positioned between the system incoming line and the primary-side unit. According to the photoelectricity and CT mixed differential protection system and the method for the isolation transformer, provided by the invention, the system is compact in structure, high in anti-jamming capability and high in reliability; differential protection is braked by accurately judging excitation surge current of the transformer; the application range covers all differential protection systems of the transformer.

Description

technical field [0001] The invention relates to the technical field of transformer protection, in particular to a differential protection system and method for an isolation transformer mixed with photoelectricity and CT. Background technique [0002] With the continuous development of the power system, the application of large-capacity transformers is becoming more and more extensive, and higher requirements are put forward for the reliability and quickness of transformer protection. Transformer differential protection has been widely accepted due to its good selectivity and rapidity. Pay attention to. As the key technology of power transformer relay protection, differential protection is widely used in traditional analog protection and new microcomputer protection. Long-term operation experience shows that the main problem of current transformer differential protection is still focused on the identification of internal faults and excitation inrush current. When a magnetiz...

Claims

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Application Information

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IPC IPC(8): H02H7/045G01R31/00
Inventor 蔡林海荆平陈硕陈国富王江波蒋晓春赵国亮
Owner STATE GRID CORP OF CHINA
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