Analysis and development of a ride-through device for ac contactors

Silva, Sidelmo M.; Braga, M. F.; Fernandes, Tammy; Milagres, Lígia

doi:10.1109/epe.2007.4417762

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…In the past many investigators have focused their efforts on the impact of the voltage sags upon the dynamic behavior of contactor [4][5][6][7][8]. For example, Pedra et al offered that the dynamic behaviors of contactor during voltage sags occur is not only affected by the magnitude and duration of voltage sags, but also be significantly influenced by the initial phase angle of the applied ac voltage source.…”

Section: Introductionmentioning

confidence: 99%

Development of a new voltage quality improving method for electromagnetic contactor

Chi

2009

JAE

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This paper focuses on a novel control algorithm and its implementation method for providing voltage compensation to the coil of an AC electromagnetic contactor during voltage sags. Firstly, a new diagnosis algorithm is designed for correctly and timely detecting the voltage-sag event. When this new algorithm is embedded in the voltage compensation circuit and in series with the AC core of the contactor, the abnormal disengagement of the contactor contacts during voltage sag event could be eliminated through several experimental results. Another one designing point is that the dynamic position of armature can only be determined by a simple estimation method. In addition, the estimated position of armature and the applied voltage and coil current are taken as inputs by a single-chip based controller and provide the compensation voltage as output if voltage-sag event occurs. The above-mentioned new algorithm has been implemented in the laboratory.

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Section: Introductionmentioning

confidence: 99%