|
|
|
| A Novel Differential Protection With Sector-Ring Restraint Region |
| Zhu Guofang, Lu Yuping |
| Southeast University Nanjing 210096 China |
|
|
|
|
Abstract Synchronization errors lead to phase shifts and the phase shift restraint capacities could describe security characteristics of differential protections caused by synchronization errors. The phase shift restraint capacity of the traditional percentage differential protection gets better when the restraint coefficient increases, with the cost of the sensitivity depression to the internal faults. The paper proposes a new differential criterion whose restraint area in ρ rho plane is a sector-ring defined by the radius setting of the inner restraint circle and the open angle setting in the unit circle. The radius setting controls the limits to magnitude errors and determines the sensitivity of protection during internal faults. The angle setting controls the amount of tolerance to phase angle errors and determines the phase shift restraint capacity of the protection independently. Simulation results show the new protection could resist 3ms time shift and has good sensitivity to inner slight faults and fine capability against current transformer saturation.
|
|
Received: 21 February 2009
Published: 18 February 2014
|
|
|
|
|
|
[1] Brahma S M, Girgis A A. Development of adaptive protection scheme for distribution system with high penetration of distribution generation[J]. IEEE Transactions on Power Delivery, 2004, 19(1): 56-63.
[2] 吴崇昱, 孙雷波, 张军. 一种基于软实时通信的广域保护原理[J]. 电力自动化设备, 2006, 26 (12): 21-24.
[3] 许建德, 陆以群. 新型数字电流差动保护装置中的数据采样同步和通信方式[J]. 电力系统自动化, 1993, 17(4): 23-26.
[4] Li H Y, Southern E P, Potts S, et al. A new type of differential feeder protection relay using the global positioning system for data synchronization [J]. IEEE Transactions on Power Delivery, 1997, 12(3): 1090-1099.
[5] 高厚磊, 江世芳, 贺家李. 数字电流差动保护中几种采样同步方法[J]. 电力系统自动化, 1996, 20(9): 46-49, 53.
[6] 金华锋, 余荣云, 朱晓彤, 等. 用于线路纵联保护的双向复用段倒换环动态延时特性研究[J]. 电力系统自动化, 2006, 30(6): 65-70.
[7] 沈冰, 何奔腾, 张雪松. 基于时钟差的线路电流差动保护数据同步方法[J]. 电网技术, 2006, 30(24): 78-83.
[8] Villamagna N, Crossley Peter A. A symmetrical component-based GPS signal failure-dection algorithm for use in feeder current differential protection[J]. IEEE Transactions on Power Delivery, 2008, 23(4): 1821-1828.
[9] Gangadharan P K, Sidhu T S, Klimek A. Influence of current transformer saturation on line current differential protection algorithms [J]. IET Generation, Transmission and Distribution, 2007, 1(2): 270-277.
[10] 李晓华, 柳焕章, 尹项根, 等. 新型双K值差动保护研究[J]. 中国电机工程学报, 2007, 27 (25): 49-55. |
|
|
|
2009, Vol. 24 
