Distance Protection for Series-Compensated Transmission Line
Contributed By: FY On Sunday, August 23, 2009 - Views: 4957
Distance protection is the most common type of protection in practical use for protecting power transmission lines.
Distance protection is the most common type ofprotection in practical use for protecting power transmission lines. The function of the distance protectionsystem is to detect a short-circuit fault on the transmission line, and to senda tripping command to the line circuit breaker following the faultdetection. The fault detection is basedon real-time distance-to-fault measurement derived from the calculation of theimpedance of the line section between the protection and fault location.
Following the restructuring of the power supplyindustry, the trend for interconnecting separate power systems is on theincrease. The interconnections oftenrequire long-distance power transmission lines. However, the power transfers amongst the interconnected systems arelimited by the transmission line lengths, and system stability margin can bereduced. Series compensation increasesthe power transfer capability of the transmission line and system transientstability.
However, the use of series compensation which isbased on capacitors will influence the impedance calculation required indistance protection.
The objectives of the project are to investigatethe impact of series compensation on the accuracy of distance protectionresponses, and to design schemes to counter the impact.
Assumptions are not defined for this project.
Duration is not defined for this project.
References are not defined for this project.