Abstract
This paper presents a technique that increases the second-zone coverage of distance relays without causing overreach problems. The technique is based on the impedance seen by distance relays when faults are simulated on the reach of zone-1 relays. The approach checks the relay operation for the maximum as well as the minimum generation outputs of the power system. The proposed technique can be used for different reach setting for zone-1. Results show that it is possible to increase the coverage provided by zone-2 distance relays without causing coordination problems with the primary relays that protect the lines emanating from the remote bus. The proposed method is modified for use in an adaptive protection system. It is shown that further improvements can be achieved when settings are calculated using the proposed method and the prevailing system conditions. The proposed method and its adaptive version were applied to a part of the Power system. The simulation of the system is done by using PSCAD-EMTDC software. The simulated results are observed and compared with the conventional and proposed technique.
Highlights
It is a general practice to use high-speed primary protection along with slower speed backup protection in power systems
This paper presents a technique that increases the second-zone coverage of distance relays without causing overreach problems
The technique is based on the impedance seen by distance relays when faults are simulated on the reach of zone-1 relays
Summary
It is a general practice to use high-speed primary protection along with slower speed backup protection in power systems. Coordination with the zone-1 relays protecting the lines emanating from the remote bus is achieved by delaying the trip outputs. These delays are of the order of 0.4 to 0.5 s that subject the power system to substantial shock. One technique for settings of transmission system distance protection based on an intelligent analysis of events and their consequences which include the zone reaches and zone time delays, as in the existing approaches, and the optimal impedance operating characteristics, the fault detection settings, and the required relay sensitivities in terms of voltage and current [6]. To demonstrate and simulate the part of the power system for zone-2 setting of distance relay by conventional, proposed and adaptive method the PSCAD/EMTC software is used [8]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
