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2020 International Conference on Electrotechnical Complexes and Systems (ICOECS), 2020
It is demonstrated that at the occurrence of geomagnetic disturbances the value of quasi-direct current acting on a generator step-up transformer depends on the type and number of blocks "synchronous generator – generator step-up transformer" as parts of a power plant, phase wire parameters, geographic direction of overhead power lines extending away ...
Vera Vakhnina +3 more
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It is demonstrated that at the occurrence of geomagnetic disturbances the value of quasi-direct current acting on a generator step-up transformer depends on the type and number of blocks "synchronous generator – generator step-up transformer" as parts of a power plant, phase wire parameters, geographic direction of overhead power lines extending away ...
Vera Vakhnina +3 more
openaire +1 more source
Evaluation of negative-sequence-current compensators for high-speed electric railways
2016 IEEE Energy Conversion Congress and Exposition (ECCE), 2016This paper evaluates three alternative topologies for a static compensator (StatCom), suitable to eliminate the negative-sequence currents in a railway system. The compensator is placed in a transformer substation, which feeds two separate sections of the catenary.
Antonios Antonopoulos, Jan R. Svensson
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Negative Sequence Current in Megawatt Hydro Generators at Uprated Unbalanced Loads
2018 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES), 2018The allowable negative sequence current (NSC) in large generator is 10% of its rated current as per IEC 60034-1 standard, irrespective of its rotor arrangement. This paper scrutinizes the NSC capability of a 250 MW salient pole hydro-generator following an unbalance at rated and above rated loads.
C. Carunaiselvane +2 more
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IEEE Transactions on Appiled Superconductivity, 1999
A SuperSMES is composed of inverters connected in series to a power system and another inverter in parallel, and a superconducting magnet for energy storage. It is a universal power quality controller because of its multi-purpose ability. The application presented here aims at a general filtering system in large industrial power consumers.
T. Ise, J. Ishii, S. Kumagai
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A SuperSMES is composed of inverters connected in series to a power system and another inverter in parallel, and a superconducting magnet for energy storage. It is a universal power quality controller because of its multi-purpose ability. The application presented here aims at a general filtering system in large industrial power consumers.
T. Ise, J. Ishii, S. Kumagai
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Real-Time Detecting Method of Negative Sequence Current in Traction System
2007 8th International Conference on Electronic Measurement and Instruments, 2007When electric locomotive moves in power system, it will produce negative sequence current, which will threat the electric equipments and the power system security operation. So it is very important to measure the value of negative sequence current rapidly and exactly. This paper introduces one new kind of method to measure the negative sequence current.
Dai Wenjin, Wu Songhui
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Use of a static var compensator for generator negative-sequence current reduction
Electric Power Systems Research, 1996Abstract The presence of negative-sequence current in a generator, due to system imbalance, induces double-frequency currents in the rotor iron. These currents may cause rotor overheating and serious damage if permitted to persist. Negative-sequence current relaying practices that alarm or trip the generator before damage can occur are well ...
Jen-Hung Chen +2 more
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The design of negative sequence current monitoring instrument based on DSP and ARM
2011 International Conference on Electric Information and Control Engineering, 2011The negative sequence current monitoring instrument named NSCM can monitor the negative sequence current, which affect the safety and stability of the generator directly according to the criterion when generator drive unbalanced load. The hardware structure of the NSCM and the algorithm of the negative sequence based on average filtering are expressed ...
Zhi-qin Wang, Jian Liu, Xiao-dong Yan
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Using negative sequence current to detect line-to-line faults in transformers
2016 IEEE Pulp, Paper & Forest Industries Conference (PPFIC), 2016Faults inside the primary 15KV windings of transformers usually begin as line-to-line faults, not involving ground, and with current magnitudes far lower than three phase bolted faults or the time-over-current or instantaneous feeder circuit settings.
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Impact of Inverter-Based Resources on Negative Sequence Quantities-Based Protection Elements
IEEE Transactions on Power Delivery, 2021Aboutaleb Haddadi +2 more
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