The Experts below are selected from a list of 72 Experts worldwide ranked by ideXlab platform
P L Chong - One of the best experts on this subject based on the ideXlab platform.
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the study of directional overcurrent Relay and directional Earth Fault protection application for 33 kv underground cable system in malaysia
International Journal of Electrical Power & Energy Systems, 2012Co-Authors: A H A Aka, Hazlie Mokhlis, H A Illias, P L ChongAbstract:Abstract Differential protection scheme is based on comparison of measured variables such as current and voltage at the two ends of a line via a communication channel such as pilot wire. This scheme is preferred and extensively used in distribution feeder protection system in Malaysia due to its fast operation. However pilot-wire differential scheme has its own drawbacks especially on the maintenance of the pilot-wire. Once the plot-wire is out of service, the feeder protection is jeopardised. One of the options to overcome such maintenance issue is to adopt directional Relay as the feeder protection. This paper investigates a suitable Relay connection and the maximum torque angle for the directional Relay for 33 kV underground network. In this study, a section of 33 kV underground network in Kuala Lumpur (KL) city has been analysed. All Faults types have been simulated at all possible location in the network. The obtained voltage and current were then used to determine the operation of directional overcurrent and Earth-Fault Relay. The simulation results indicate that 30° Relay connection with 0° maximum torque angle (30°/0°) is the most suitable setting to be applied for 33 kV underground network in KL, as against the best general and most versatile setting, 45°/90°.
A H A Aka - One of the best experts on this subject based on the ideXlab platform.
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the study of directional overcurrent Relay and directional Earth Fault protection application for 33 kv underground cable system in malaysia
International Journal of Electrical Power & Energy Systems, 2012Co-Authors: A H A Aka, Hazlie Mokhlis, H A Illias, P L ChongAbstract:Abstract Differential protection scheme is based on comparison of measured variables such as current and voltage at the two ends of a line via a communication channel such as pilot wire. This scheme is preferred and extensively used in distribution feeder protection system in Malaysia due to its fast operation. However pilot-wire differential scheme has its own drawbacks especially on the maintenance of the pilot-wire. Once the plot-wire is out of service, the feeder protection is jeopardised. One of the options to overcome such maintenance issue is to adopt directional Relay as the feeder protection. This paper investigates a suitable Relay connection and the maximum torque angle for the directional Relay for 33 kV underground network. In this study, a section of 33 kV underground network in Kuala Lumpur (KL) city has been analysed. All Faults types have been simulated at all possible location in the network. The obtained voltage and current were then used to determine the operation of directional overcurrent and Earth-Fault Relay. The simulation results indicate that 30° Relay connection with 0° maximum torque angle (30°/0°) is the most suitable setting to be applied for 33 kV underground network in KL, as against the best general and most versatile setting, 45°/90°.
Minkley Warick - One of the best experts on this subject based on the ideXlab platform.
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Analysis of restricted Earth Fault Relay application within a shunt capacitor bank design impacting on protection stability
Faculty of Engineering the Built Environment and Information Technology, 2013Co-Authors: Minkley WarickAbstract:This research is aimed at analyzing the performance of the restricted Earth Fault Relay used on a 400kV capacitor bank scheme used on the Eskom Transmission network. After the commissioning of two Capacitor Banks using the above mentioned scheme design the plant was energized. As a result of the energization the Shunt Capacitor Bank (SCB) then experienced spurious trips. The cause of the trips was found to be the operation of the restricted Earth Fault Relay. In this research project, restricted Earth Fault protection on SCBs in the Eskom Transmission environment will be the area of interest. The proposed research will analyze the current SCB protection scheme in service specifically looking at the restricted Earth Fault circuit design and Relay performance. An equivalent model of the SCB from primary plant perspective based on theory will be derived. Recording and analyzing of Comtrade transient waveforms respectively, when the bank is nergized, will be done in order to provide a reference base to work from. Manual alculations of various parameters from the derived model including transient inrush currents and Fault currents will be performed to access applicable scheme parameters. Further calculations will include the voltage setting for the restricted Earth Fault Relay. As a result of the analysis a recommendation will be made on a viable solution or a revised design will be put forward, based on the results, to improve the scheme’s performance. The protection scheme is used on the two 400kV 100MVAR capacitor banks 11 and 12 at Hydra Substation
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Analysis of restricted Earth Fault Relay application within a shunt capacitor bank design impacting on protection stability
Nelson Mandela Metropolitan University, 2013Co-Authors: Minkley WarickAbstract:This research is aimed at analyzing the performance of the restricted Earth Fault Relay used on a 400kV capacitor bank scheme used on the Eskom Transmission network. After the commissioning of two Capacitor Banks using the above mentioned scheme design the plant was energized. As a result of the energization the Shunt Capacitor Bank (SCB) then experienced spurious trips. The cause of the trips was found to be the operation of the restricted Earth Fault Relay. In this research project, restricted Earth Fault protection on SCBs in the Eskom Transmission environment will be the area of interest. The proposed research will analyze the current SCB protection scheme in service specifically looking at the restricted Earth Fault circuit design and Relay performance. An equivalent model of the SCB from primary plant perspective based on theory will be derived. Recording and analyzing of Comtrade transient waveforms respectively, when the bank is energized, will be done in order to provide a reference base to work from. Manual calculations of various parameters from the derived model including transient inrush currents and Fault currents will be performed to access applicable scheme parameters. Further calculations will include the voltage setting for the restricted Earth Fault Relay. As a result of the analysis a recommendation will be made on a viable solution or a revised design will be put forward, based on the results, to improve the scheme’s performance. The protection scheme is used on the two 400kV 100MVAR capacitor banks 11 and 12 at Hydra Substatio
H A Illias - One of the best experts on this subject based on the ideXlab platform.
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the study of directional overcurrent Relay and directional Earth Fault protection application for 33 kv underground cable system in malaysia
International Journal of Electrical Power & Energy Systems, 2012Co-Authors: A H A Aka, Hazlie Mokhlis, H A Illias, P L ChongAbstract:Abstract Differential protection scheme is based on comparison of measured variables such as current and voltage at the two ends of a line via a communication channel such as pilot wire. This scheme is preferred and extensively used in distribution feeder protection system in Malaysia due to its fast operation. However pilot-wire differential scheme has its own drawbacks especially on the maintenance of the pilot-wire. Once the plot-wire is out of service, the feeder protection is jeopardised. One of the options to overcome such maintenance issue is to adopt directional Relay as the feeder protection. This paper investigates a suitable Relay connection and the maximum torque angle for the directional Relay for 33 kV underground network. In this study, a section of 33 kV underground network in Kuala Lumpur (KL) city has been analysed. All Faults types have been simulated at all possible location in the network. The obtained voltage and current were then used to determine the operation of directional overcurrent and Earth-Fault Relay. The simulation results indicate that 30° Relay connection with 0° maximum torque angle (30°/0°) is the most suitable setting to be applied for 33 kV underground network in KL, as against the best general and most versatile setting, 45°/90°.
Hazlie Mokhlis - One of the best experts on this subject based on the ideXlab platform.
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the study of directional overcurrent Relay and directional Earth Fault protection application for 33 kv underground cable system in malaysia
International Journal of Electrical Power & Energy Systems, 2012Co-Authors: A H A Aka, Hazlie Mokhlis, H A Illias, P L ChongAbstract:Abstract Differential protection scheme is based on comparison of measured variables such as current and voltage at the two ends of a line via a communication channel such as pilot wire. This scheme is preferred and extensively used in distribution feeder protection system in Malaysia due to its fast operation. However pilot-wire differential scheme has its own drawbacks especially on the maintenance of the pilot-wire. Once the plot-wire is out of service, the feeder protection is jeopardised. One of the options to overcome such maintenance issue is to adopt directional Relay as the feeder protection. This paper investigates a suitable Relay connection and the maximum torque angle for the directional Relay for 33 kV underground network. In this study, a section of 33 kV underground network in Kuala Lumpur (KL) city has been analysed. All Faults types have been simulated at all possible location in the network. The obtained voltage and current were then used to determine the operation of directional overcurrent and Earth-Fault Relay. The simulation results indicate that 30° Relay connection with 0° maximum torque angle (30°/0°) is the most suitable setting to be applied for 33 kV underground network in KL, as against the best general and most versatile setting, 45°/90°.
