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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Over Voltage Fault due to Disconnection of Consumer’s Transformer Neutral Wire
Author(s)
Erdene Adiyasuren, Enkh-Od Erdene, Sergelen Byambaa and Shagdarsuren Gantumur
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DOI:10.17265/1934-8975/2023.01.002
Affiliation(s)
Mongolian University of Science and Technology, Ulaanbaatar 14191, Mongolia
ABSTRACT
Practically, the load currents in three phases are asymmetric in the power system. It means that the impedances are different in all three phases. If the consumer’s transformer neutral cut off and/or was disconnected from the neutral of power supply source, then there will be some trouble and failure occurred. The current in the neutral wire drops down to zero when the neutral wire is cut off and the phase currents of all three-phase equal to each other since there was no return wire. The currents are equal but the voltages at the phase consumers are different. Especially for residential single-phase consumers, the voltage at the consumers of the phase varies differently for three phase systems when the neutral wire was disconnected at consumer side and even the voltage at the consumers one or two of those three phases becomes over nominal voltage or reaches nearly line voltage. In this case, the electronic appliances in that phase will be fed by high voltage than the rated value and they can be broken down. In the power system of UB (Ulaanbaatar) city, there are some occasional such kind of failures every year. Obviously, many electronic appliances were broken down due to high voltage and the electricity utility companies respond for service charge of damaged parts.
KEYWORDS
Neutral connection and neutral wire, phase and line voltage, single-phase residential consumer, transformer neutral cut off, asymmetric load current, protective earth.
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