Adaptive relays for overhead line protection
- 作者：V. Calderaro ; V. Galdi ; A. Piccolo ; P. Siano
- 关键词：Protection system ; Overhead line ; Adaptive relay
- 刊名：Electric Power Systems Research
- 出版年：2007
- 期刊代码：49_03787796
- 类别：et
- 出版时间：October 2007
- 卷：77
- 期：12
- 页码：1552-1559
- 文件大小：367 K
摘要
In the liberalized energy market scenario protective relays play an important role in assuring continuous service in the power system where a malfunctioning could lead to serious damages to a wide number of operators having access to the power system. Considering that power lines are operated many times below a rated load current, in this paper an adaptive procedure is presented in order to manage power distribution systems according to dependability or security requirements. In particular, a procedure to obtain an inverse time trip curve by means of a microprocessor, connected to a relay, is presented. The procedure adapts the trip characteristic depending on the conductor temperature, wind speed, emissivity and solar absorbity and is implemented on a microprocessor Rabbit 2200 considering a Drake conductor, 795 kcmil 26/7 ACSR.