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Design of Test System on Zero Sequence Current Transformers
2010 International Conference on Machine Vision and Human-machine Interface, 2010The zero sequence current transformer is one of the key component of permanent magnetism leakage circuit protection breaker and release relay. A C8051F120 microcontroller is used as the controller of performance test system of an intelligent zero sequence current transformers.
Da-neng Pi, Hai-zhou Gao
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A novel approach to eliminate zero-sequence harmonics current
APCCAS 2008 - 2008 IEEE Asia Pacific Conference on Circuits and Systems, 2008Zero-sequence harmonics caused by nonlinear loads usually result in high voltage distortion levels throughout the facility, neutral conductor overloading, motor heating, transformer heating, increased losses, and excessive harmonic injection onto the utility supply system. This paper presents a novel method to eliminate zero-sequence harmonics by using
Qipeng Song +5 more
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Soil resistivity: Field tests and estimation of zero-sequence currents
2017 IEEE AFRICON, 2017In this study, field measurements of soil resistivity using the 4-point Wenner test method were conducted in several parts of Gauteng, a province in South Africa. The data obtained were used to determine soil resistance values, and therefore to estimate zero-sequence current for a DigSilent™ simulated ground fault.
Quentin Louw, Pitshou N. Bokoro
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Zero-sequence Circulating Current Suppression Strategy for Microgrid Inverters
2021 IEEE International Conference on Mechatronics and Automation (ICMA), 2021The parallel connection of inverters in the microgrid system increases the system capacity, but also provides a basis for the generation of zero sequence circulating current (ZSCC). In order to solve the problems of system loss caused by ZSCC, an improved controller was designed.
Xuesong Zhou +3 more
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Performance improvement of brushless DC machine by zero-sequence current injection
IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society, 2015A novel current control strategy for Brushless DC machines (BLDCs) is presented in this paper. It aims to increase BLDC exploitation compared to conventional current commutation (two-phase-on) and three-phase-on control approaches. The proposed current control strategy consists in injecting a suitable zero-sequence current in order to exploit the BLDC ...
SERPI, ALESSANDRO +4 more
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A study of zero-sequence current induced in a cable system
IEEE Transactions on Power Delivery, 1991Large zero-sequence currents found in an actual crossbonded cable system led to a study of their causes and a solution to the problem. Measured values were compared to calculated results by the BPA-EMTP circuit analysis program. It was found that the zero-sequence currents were circulating between different circuits in the cable system and that they ...
H. Nakanishi +6 more
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A novel technique for reducing leakage current by application of zero-sequence voltage
2014 International Power Electronics Conference (IPEC-Hiroshima 2014 - ECCE ASIA), 2014This paper proposes a technique for reducing the leakage current flowing into a power source as a conducted noise. This leakage current may have an adverse effect on the peripheral equipment, e.g., causing malfunctions. The proposed technique requires us to add a zero-sequence voltage to the output voltage reference of the inverter.
Hideki Ayano +2 more
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Operational constraints of zero-sequence current feeding in bearingless PM synchronous machines
e & i Elektrotechnik und Informationstechnik, 2021For magnetically levitated drives with a 3-phase stator winding, one degree of freedom in the rotor motion can be controlled through a zero-sequence current. For example, an axial active magnetic bearing or a single-phase motor winding can be fed by this zero-sequence current. The zero-sequence current feeding is advantageous due to the saving of power
Daniel Dietz, Andreas Binder
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APF-based cancellation of the source-end zero sequence current
2010 International School on Nonsinusoidal Currents and Compensation, 2010Analytical assessment of the successful neutral current cancellation methods is the main goal of this paper. Furthermore, proposing a generalized time-domain method is pursued in order to achieve full cancellation of the source-end neutral current under unbalanced and distorted load voltage waveforms.
Ehsan Pashajavid, Mohammad Tavakoli Bina
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The zero sequence circulating current suppression based on virtual impedance
2012 Power Engineering and Automation Conference, 2012There are zero sequence circuits, when inverters work in parallel directly, and zero sequence circulating current would flow, when zero sequence voltage of the inverter is different with that of the gird. The mechanism of the zero sequence circulating current is analyzed.
Xu Tieyan, Luo Yaohua
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