Investigation On High Neutral Earthing Resistor Temperature When Islanded Generator Connected To Utility Grid
Electricity supply to Universiti Teknologi PETRONAS (UTP) is provided by two generating units at gas district cooling (GDC) plant located in the campus. Under normal operation, UTP power system is operating in island mode and during emergency, it will be connected to utility grid of Tenaga Nasio...
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| Main Authors: | , , , , , |
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| Format: | Conference or Workshop Item |
| Published: |
2010
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| Subjects: | |
| Online Access: | http://eprints.utp.edu.my/5630/1/P0321.pdf http://eprints.utp.edu.my/5630/ |
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| Summary: | Electricity supply to Universiti Teknologi PETRONAS
(UTP) is provided by two generating units at gas district cooling
(GDC) plant located in the campus. Under normal operation, UTP
power system is operating in island mode and during emergency, it
will be connected to utility grid of Tenaga Nasional Berhad (TNB).
Each generating unit is grounded through neutral earthing
resistor (NER). It has been observed that NER temperature
become high when generator operating in parallel with the grid.
Investigation reveals that triplen harmonics currents continuously
flow through NER during island and parallel operation. Higher
triplen harmonics currents are noticed during parallel operation
as compared to island mode of operation. High NER temperature
is caused by increase in triplen harmonics currents that flow
through it. The above phenomena are described in this paper
together with some proposed measures to overcome the problem. |
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