|
|
中国电机工程学报 2007, 27(34) 52-58 DOI:
ISSN: 0258-8013 CN: 11-2107/TM |
|
|
|
|
本期目录 |
下期目录 |
过刊浏览 |
高级检索
[打印本页]
[关闭] |
|
| 电力系统 |
|
|
基于磁制动原理的特高压变压器励磁涌流快速识别 |
|
|
刘玉欢 陆于平 袁宇波 查申森 林霞 |
|
|
东南大学电气工程学院 东南大学电气工程学院 江苏省电力试验研究院 江苏省电力设计院 东南大学电气工程学院 |
|
|
摘要：
针对特高压大容量三相分体变压器差动保护，提出一种基于磁特性的励磁涌流快速识别新方案，该方案充分考虑了特高压变压器端部接长距离输电线路的实际特点，配合自适应数字低通滤波器计算变压器等效瞬时磁阻，有效解决了内部故障时由于变压器模型简化造成的计算误差问题。根据内部故障和励磁涌流时等效瞬时磁阻的不同变化特征，能够在10 ms识别出励磁涌流，同时还考虑了内部故障TA饱和的影响，能够保证在TA严重饱和情况下做出正确判断。该方案识别速度快、可靠性高、整定方便，具有广阔的工程应用前景。实验结果验证了其快速性和可靠性。
|
|
|
关键词：
特高压变压器
等效瞬时磁阻
励磁涌流
电流互感器饱和
差动保护
|
|
|
A Novel Scheme Based on Flux Restraint Theory Used in Distinguishing Inrush Currents for UHV Transformers |
|
|
|
|
|
|
|
|
Abstract:
As to differential protection for ultra-high voltage (UHV) three-phase divided tank transformer, this paper provides a novel fast magnetizing inrush currents distinguishing scheme based on magnetizing character. With sufficient consideration to realistic application factor of UHV transformer end connecting with long-distance transmission line, and with corresponding calculation for transformer equivalent instantaneous reluctance using adaptive digital low-pass filter, this scheme is good for solving problems of calculation error rising from transformer model simplification. According to different characteristics in variation during internal fault and magnetizing inrush, it can be accomplished to identify magnetizing inrush in just 10ms, at the same time it also gives the consideration to the influence of TA saturation during internal fault in guarantee of correct judgement even TA is in serious saturation. This scheme is with following virtues including real time response, small calculation workload, high reliability, and promising engineering applications. It is proved its real time capability and reliability through test.
|
|
|
Keywords:
ultra-high voltage transformer
equivalent instantaneous reluctance
inrush current
current transformer saturation
differential protection
|
|
|
收稿日期 2006-09-20 修回日期 1900-01-01 网络版发布日期 |
|
|
DOI: |
|
|
基金项目:
|
|
|
通讯作者: 刘玉欢 |
|
|
作者简介: |
|
作者Email: singo-1983@163.com |
|
|
| 参考文献： |
|
| 本刊中的类似文章 |
| 1．文继锋 程骁 张晓宇 陈松林.特高压变压器差动保护研究[J]. 中国电机工程学报, 2009,29(22): 58-62 |
| 2．张文亮 张国兵.特高压变压器用油技术指标及若干问题探讨[J]. 中国电机工程学报, 2009,29(7): 1-6 |
|
| Copyright by 中国电机工程学报 |
