Essays about: "distance relays"

Showing result 1 - 5 of 7 essays containing the words distance relays.

1. 1. The impacts of series compensated EHV lines on distance protection, and a proposed new mitigation solution

   University essay from KTH/Elektroteknisk teori och konstruktion

   Author : Syed Arif Ullah Shah; [2017]
   Keywords : Series compensation; metal oxide varistor; voltage inversion; current inversion; sub-synchronous oscillation; quadrilateral characteristic distance relay; digital high-pass filter; Seriekompensation; metalloxidvaristor; spänningsinversion; ströminversion; subsynkron oscillation; fyrsidig karakteristiskt distansrelä; digitalt högpassfilter;

   Abstract : Series compensation is extensively applied to the transmission lines to increase the power transfer capability of transmission lines, reduce transmission losses, improve voltage profiles, and improve power oscillation damping and transient stability of power systems. But it modifies the apparent impedance of the transmission lines during fault conditions and might cause the distance protection of transmission lines to encounter directional discrimination issues and reach problems. READ MORE

3. 2. DIFFERENTIAL CODE SHIFTED REFERENCE IMPULSE-BASED COOPERATIVE UWB COMMUNICATION SYSTEM

   University essay from Blekinge Tekniska Högskola/Institutionen för datalogi och datorsystemteknik

   Author : Shoaib Amjad; Rohail Khan Malhi; Muhammad Burhan; [2013]
   Keywords : Bit error rate; Cooperative system; Differential code shift Reference and Ultra wide band communication.;

   Abstract : Cooperative Impulse Response – Ultra Wideband (IR-UWB) communication is a radio technology very popular for short range communication systems as it enables single-antenna mobiles in a multi-user environment to share their antennas by creating virtual MIMO to achieve transmit diversity. In order to improve the cooperative IR-UWB system performance, we are going to use Differential Code Shifted Reference (DCSR). READ MORE

4. 3. Performance Evaluation of 2-Hop and 3-Hop Relay Network using DF, AF and DAF Relaying Protocols

   University essay from Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

   Author : Mohsin Kamal; Theera Yukong; [2012]
   Keywords : Amplify and Forward; Decode and Forward; Decode Amplify and Forward; Relay network; 2-hop and 3-hop cognitive radio networks ;

   Abstract : Cognitive radio is an evolving wireless technology employed to increase the frequency spectrum utilization of the limited spectral resources. Cooperative communications has been established as a potential method of solving the fading effects in wireless communications, improving the reliability of network performance, network throughput, and adaptability. READ MORE

5. 4. Code Shift Reference Impulse Based Cooperative UWB Communication System

   University essay from Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

   Author : Pir Meher Ali Shah; Ashik Gurung; Mohammad Abdul Rub; [2011]
   Keywords : Transmitted Reference TR UWB; Frequency Shift Reference FSR UWB; Code Shift Reference UWB; Cooperative Communication; Impulse Radio UWB; Decode and Forward. ;

   Abstract : Ultra wideband (UWB) is a radio technology in which the transmission of information is done over a large bandwidth with very short pulses at low energy levels. UWB technology has gained a high popularity in the field of short-range wireless communications. READ MORE

6. 5. Pilot Protection Based on Directional Detection

   University essay from KTH/Elektriska energisystem

   Author : Sepehr Sefidpour; [2009]
   Keywords : Transmission line protection; UHS relaying; Traveling wave; Numerical relay.;

   Abstract : Nowadays two main types of protection schemes widely used in protection of transmission lines are: distance protection and differential protection schemes. However, it has been noticed from industrial practice that the distance protection scheme used today generally is limited in tripping speed and selectivity. READ MORE