The Experts below are selected from a list of 12 Experts worldwide ranked by ideXlab platform
F Blazquez - One of the best experts on this subject based on the ideXlab platform.
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novel rotor ground fault detection algorithm for synchronous machines with static excitation based on third harmonic Voltage Phasor comparison
IEEE Transactions on Industrial Electronics, 2016Co-Authors: F R Blanquez, C A Platero, E Rebollo, F BlazquezAbstract:This paper presents a new algorithm for detecting ground faults in rotor windings. This location method is suitable for synchronous generators with static excitation, whose excitation field winding is fed by controlled rectifiers through an excitation transformer. This new algorithm is an improvement of an online ground-fault location method presented previously, in which the effect of the rotor capacitance has a high influence in the correct detection of the fault. The detection of the ground fault is performed by the supervision of the phase angle between two Phasor Voltages. The first one is the third-harmonic Phasor Voltage obtained from the measurement of the field Voltage, which is used as a reference. The second one is the third-harmonic Voltage Phasor obtained by the measurement in a grounding resistance placed in the neutral of the excitation transformer. It allows not only detecting the ground fault along the field winding but also distinguishing the cases of ground fault in the rotor winding, from the cases of high influence of the rotor capacitance in healthy condition. This new algorithm has been tested with satisfactory results in a 106-MVA hydro generating unit.
F R Blanquez - One of the best experts on this subject based on the ideXlab platform.
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novel rotor ground fault detection algorithm for synchronous machines with static excitation based on third harmonic Voltage Phasor comparison
IEEE Transactions on Industrial Electronics, 2016Co-Authors: F R Blanquez, C A Platero, E Rebollo, F BlazquezAbstract:This paper presents a new algorithm for detecting ground faults in rotor windings. This location method is suitable for synchronous generators with static excitation, whose excitation field winding is fed by controlled rectifiers through an excitation transformer. This new algorithm is an improvement of an online ground-fault location method presented previously, in which the effect of the rotor capacitance has a high influence in the correct detection of the fault. The detection of the ground fault is performed by the supervision of the phase angle between two Phasor Voltages. The first one is the third-harmonic Phasor Voltage obtained from the measurement of the field Voltage, which is used as a reference. The second one is the third-harmonic Voltage Phasor obtained by the measurement in a grounding resistance placed in the neutral of the excitation transformer. It allows not only detecting the ground fault along the field winding but also distinguishing the cases of ground fault in the rotor winding, from the cases of high influence of the rotor capacitance in healthy condition. This new algorithm has been tested with satisfactory results in a 106-MVA hydro generating unit.
C A Platero - One of the best experts on this subject based on the ideXlab platform.
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novel rotor ground fault detection algorithm for synchronous machines with static excitation based on third harmonic Voltage Phasor comparison
IEEE Transactions on Industrial Electronics, 2016Co-Authors: F R Blanquez, C A Platero, E Rebollo, F BlazquezAbstract:This paper presents a new algorithm for detecting ground faults in rotor windings. This location method is suitable for synchronous generators with static excitation, whose excitation field winding is fed by controlled rectifiers through an excitation transformer. This new algorithm is an improvement of an online ground-fault location method presented previously, in which the effect of the rotor capacitance has a high influence in the correct detection of the fault. The detection of the ground fault is performed by the supervision of the phase angle between two Phasor Voltages. The first one is the third-harmonic Phasor Voltage obtained from the measurement of the field Voltage, which is used as a reference. The second one is the third-harmonic Voltage Phasor obtained by the measurement in a grounding resistance placed in the neutral of the excitation transformer. It allows not only detecting the ground fault along the field winding but also distinguishing the cases of ground fault in the rotor winding, from the cases of high influence of the rotor capacitance in healthy condition. This new algorithm has been tested with satisfactory results in a 106-MVA hydro generating unit.
E Rebollo - One of the best experts on this subject based on the ideXlab platform.
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novel rotor ground fault detection algorithm for synchronous machines with static excitation based on third harmonic Voltage Phasor comparison
IEEE Transactions on Industrial Electronics, 2016Co-Authors: F R Blanquez, C A Platero, E Rebollo, F BlazquezAbstract:This paper presents a new algorithm for detecting ground faults in rotor windings. This location method is suitable for synchronous generators with static excitation, whose excitation field winding is fed by controlled rectifiers through an excitation transformer. This new algorithm is an improvement of an online ground-fault location method presented previously, in which the effect of the rotor capacitance has a high influence in the correct detection of the fault. The detection of the ground fault is performed by the supervision of the phase angle between two Phasor Voltages. The first one is the third-harmonic Phasor Voltage obtained from the measurement of the field Voltage, which is used as a reference. The second one is the third-harmonic Voltage Phasor obtained by the measurement in a grounding resistance placed in the neutral of the excitation transformer. It allows not only detecting the ground fault along the field winding but also distinguishing the cases of ground fault in the rotor winding, from the cases of high influence of the rotor capacitance in healthy condition. This new algorithm has been tested with satisfactory results in a 106-MVA hydro generating unit.
Aboul’fotouh El’gharably - One of the best experts on this subject based on the ideXlab platform.
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Proposed Application for Rate of Change of Phasor Voltage in Fault Detection and Coordination Studies in MV Distribution Networks
Iranian Journal of Science and Technology Transactions of Electrical Engineering, 2021Co-Authors: Mohamed Ahmed Dawoud, Doaa Khalil Ibrahim, Mahmoud Ibrahim Gilany, Aboul’fotouh El’gharablyAbstract:Selectivity, reliability and security of electrical distribution systems are important issues in modern power systems. The protection coordination approach that depends on fault current only is no longer valid for medium Voltage (MV) distribution systems; it has major limitations because of varying network conditions. In this paper, a new protective coordination technique is proposed in MV distribution networks. The proposed technique is based on calculating the rate of change of Phasor Voltage ( ROCOV ) in each feeder to discriminate and locate the faulty section. The measured ROCOV values and the required relay operating time take the shape of the standard inverse-time characteristics that are used for overcurrent relay. The system allows full coordination between the primary and backup relays. Without any need for communications, the proposed technique proved good robustness during different transient healthy conditions. The setting of the proposed relay does not need to be re-adjusted with the changes in network operating conditions since it depends on system Voltage not the loading current. The proposed technique is tested using extensive MATLAB simulations under different faulty and healthy conditions in a MV distribution system. The results indicate that the proposed technique meets the fundamental protective requirements such as selectivity, reliability, sensitivity, and speed as well.