Investigation on high neutral earthing resistor temperature when islanded generator connected to utility grid

Author

Bin Abdullah, Mohd Faris ; Bin Hamid, Nor Hisham ; Bin Baharudin, Zuhairi ; Bin Khamis, Mohd Fatimie Irzaq ; Binti Hashim, Nik Siti Rashidah ; Bin Yusof, Sallehhudin

Author_Institution

Electr. & Electron. Eng. Dept., Univ. Teknol. PETRONAS, Tronoh, Malaysia

fYear

2010

fDate

27-29 Oct. 2010

Firstpage

642

Lastpage

647

Abstract

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.

Keywords

cooling; earthing; electricity supply industry; power grids; power system harmonics; power system interconnection; resistors; synchronous generators; NER temperature; electricity supply; gas district cooling; generating units; harmonics currents; islanded generator; neutral earthing resistor; power system; utility grid connection; Current measurement; Generators; Harmonic analysis; Heating; Power system harmonics; Resistors; Temperature measurement; Neutral earthing resistor (NER); generator; triplen harmonics currents;

fLanguage

English

Publisher

ieee

Conference_Titel

IPEC, 2010 Conference Proceedings

Conference_Location

Singapore

ISSN

1947-1262

Print_ISBN

978-1-4244-7399-1

Type

conf

DOI

10.1109/IPECON.2010.5697072

Filename

5697072