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Neutral‐grounded structure for delta‐connected windings and method thereof
Author(s) -
Chen TsaiHsiang,
Chen TaiJou,
Liao RihNeng
Publication year - 2017
Publication title -
international journal of numerical modelling: electronic networks, devices and fields
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.249
H-Index - 30
eISSN - 1099-1204
pISSN - 0894-3370
DOI - 10.1002/jnm.2242
Subject(s) - electromagnetic coil , ground , contactor , voltage , electrical engineering , engineering , control theory (sociology) , computer science , physics , control (management) , power (physics) , quantum mechanics , artificial intelligence
The use of conventional grounding methods in the delta‐connected windings can lead to differences of the 3 phase‐to‐ground voltages, resulting in a number of problems. For example, when a coil of a contactor in a motor control circuit is connected to the improper phase lines of the delta‐connected windings, the coil might be broken due to effects of grounded points in the conventional grounding methods. Hence, a specific grounding method, the neutral‐grounded structure, was provided for delta‐connected secondary windings in which a grounding winding is disposed in at least 1 of the phase windings. The first end of the grounding winding is connected to a grounded point, which functions as a neutral point. The second end of the grounding winding is connected to a tap of 1 of the other 2‐phase windings. The voltage‐phase displacement between the grounding winding and the corresponding‐phase winding is 180°. According to the above‐mentioned neutral‐grounded structure, all the 3 phase‐to‐ground voltages are uniform as long as the system remains in balance. This paper presents steady‐state models and simulation results by MATLAB/Simulink to verify a neutral‐grounded structure for delta‐connected secondary windings and method thereof.