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High-voltage ac. controllable parallel-connection reactor high-differential protection method

A high-voltage AC and differential protection technology, applied in the field of power systems, can solve the problems of fixed high-resistance configuration longitudinal differential protection, homodyne protection cannot be protected, etc.

Active Publication Date: 2007-06-13
BEIJING SIFANG JIBAO AUTOMATION +1
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AI Technical Summary

Problems solved by technology

For the inter-turn fault and ground fault of the secondary winding of the high-voltage AC controllable shunt reactor, the differential protection, homodyne protection and backup protection of the fixed high-resistance configuration cannot be protected.

Method used

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  • High-voltage ac. controllable parallel-connection reactor high-differential protection method
  • High-voltage ac. controllable parallel-connection reactor high-differential protection method
  • High-voltage ac. controllable parallel-connection reactor high-differential protection method

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Embodiment Construction

[0042] specific implementation plan

[0043]In order to protect the internal faults of the high-voltage AC controllable shunt reactor, especially the turn-to-turn fault and ground fault of the secondary side, the author proposes a high-voltage AC controllable shunt reactor based on the analysis of the design parameters of the high-voltage AC controllable shunt reactor The shunt reactor is equipped with a large differential protection scheme. Theoretical analysis and simulation calculations found that although the leakage reactance of the controllable high reactance is as high as 100%, the characteristics of the air gap magnetic circuit and iron core are different from those of ordinary transformers, the current of the primary side and the current of the secondary control winding still satisfy the transformation ratio relationship, The head-end current of the primary and secondary sides can be taken to form a large differential protection, and for the high-voltage AC controllab...

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Abstract

The method includes steps: sampling waveforms of current transformer (TA) at primary and secondary sides of high voltage, AC controllable type shunt reactor, protector of reactor obtains instantaneous values of current; using Fourier algorithm determines complex form of each electric quantity; based on TA transformation ratio input from user to calculate balance coefficient automatically, and to output the coefficient for users to check it out; using the balance coefficient to calculate secondary current at secondary side of reactor after compensation of balance; calculating differential current and braking current; based on differential quick break and ratio brake characteristic to determine protection logic of large differential in order to carry out protection action. The method also includes tests of vacancy throw, TA DC saturation, and TA abnormity. The invention protects fault inside the said reactor, especially winding and grounding faults of coil at secondary side.

Description

technical field [0001] The present invention relates to the field of power systems, and more particularly to a method for relay protection. Background technique [0002] First, the related art of the present invention is briefly described based on the following references. [0003] 1. Chen Weixian, Chen He. Controllable adjustment of shunt reactor [J]. High Voltage Technology, 2006, 26(5). [0004] 2. Li Dayi, Chen Qiaofu, etc. New principle of adjustable reactor based on flux control [J]. Chinese Journal of Electrical Engineering, 2003, 23(2). [0005] 3. Tian Kexing, Li Qingfu. Magnetic field and parameter calculation of transformer-type controllable reactor [J]. Journal of Xi'an Jiaotong University, 2005, 39(6). [0006] High-voltage shunt reactors are an important part of ultra-high voltage and ultra-high voltage power grids. The installation of a high-voltage shunt reactor can compensate the capacitive power of the line, and can limit the operating overvoltage, the c...

Claims

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Application Information

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IPC IPC(8): H02H3/26H02H7/00
Inventor 苏毅屠黎明邹东霞刘建飞黄少锋
Owner BEIJING SIFANG JIBAO AUTOMATION
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