Determination Of Correction Factor For Differential Relay Setting On Distribution Transformer Protection System Under Harmonic Condition

In this thesis a new method is implemented to overcome the miss-operation problem of differential relay for distribution power transformer operates under harmonic condition. Correction factor as a new method to overcome this problem is introduced and implemented for the relay setting, so that the re...

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Main Author:	Nisja, Indra
Format:	Thesis
Language:	English
Published:	2013
Subjects:	TK1-9971 Electrical engineering Electronics Nuclear engineering
Online Access:	http://eprints.usm.my/43507/1/Indra%20Nisja24.pdf
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id	my-usm-ep.43507
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spelling	my-usm-ep.435072019-04-12T05:26:09Z Determination Of Correction Factor For Differential Relay Setting On Distribution Transformer Protection System Under Harmonic Condition 2013-11 Nisja, Indra TK1-9971 Electrical engineering. Electronics. Nuclear engineering In this thesis a new method is implemented to overcome the miss-operation problem of differential relay for distribution power transformer operates under harmonic condition. Correction factor as a new method to overcome this problem is introduced and implemented for the relay setting, so that the relay works properly even though operates under harmonic conditions. In order to determine the correction factor, the effects of harmonics to all components error has been obtained through laboratory test. The tests have been conducted to determine the errors that occur in power transformers and CT when operating under harmonic condition. From the error obtained, the differential current error flow through the relays was defined and differential relay setting was also determined. Experimental results for THDi ranging from 4.6% to 40.88% show that the maximum errors occurred on CT at secondary power transformers is found to be 27.21% and CT at primary power transformers is 10.12%. The maximum error occurred at power transformer found to be 8.57%. For the same THDi the correction factor which was implemented is 30.14. A relationship between THDi and differential relay setting has been established through the differential current error occurred caused by harmonic currents. Correction factor method has able to overcome the miss-operation problem of differential relay for distribution power transformer up to 40% THDi. 2013-11 Thesis http://eprints.usm.my/43507/ http://eprints.usm.my/43507/1/Indra%20Nisja24.pdf application/pdf en public phd doctoral Universiti Sains Malaysia Pusat Pengajian Kejuruteraan Elektrik & Elektronik
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	TK1-9971 Electrical engineering Electronics Nuclear engineering
spellingShingle	TK1-9971 Electrical engineering Electronics Nuclear engineering Nisja, Indra Determination Of Correction Factor For Differential Relay Setting On Distribution Transformer Protection System Under Harmonic Condition
description	In this thesis a new method is implemented to overcome the miss-operation problem of differential relay for distribution power transformer operates under harmonic condition. Correction factor as a new method to overcome this problem is introduced and implemented for the relay setting, so that the relay works properly even though operates under harmonic conditions. In order to determine the correction factor, the effects of harmonics to all components error has been obtained through laboratory test. The tests have been conducted to determine the errors that occur in power transformers and CT when operating under harmonic condition. From the error obtained, the differential current error flow through the relays was defined and differential relay setting was also determined. Experimental results for THDi ranging from 4.6% to 40.88% show that the maximum errors occurred on CT at secondary power transformers is found to be 27.21% and CT at primary power transformers is 10.12%. The maximum error occurred at power transformer found to be 8.57%. For the same THDi the correction factor which was implemented is 30.14. A relationship between THDi and differential relay setting has been established through the differential current error occurred caused by harmonic currents. Correction factor method has able to overcome the miss-operation problem of differential relay for distribution power transformer up to 40% THDi.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Nisja, Indra
author_facet	Nisja, Indra
author_sort	Nisja, Indra
title	Determination Of Correction Factor For Differential Relay Setting On Distribution Transformer Protection System Under Harmonic Condition
title_short	Determination Of Correction Factor For Differential Relay Setting On Distribution Transformer Protection System Under Harmonic Condition
title_full	Determination Of Correction Factor For Differential Relay Setting On Distribution Transformer Protection System Under Harmonic Condition
title_fullStr	Determination Of Correction Factor For Differential Relay Setting On Distribution Transformer Protection System Under Harmonic Condition
title_full_unstemmed	Determination Of Correction Factor For Differential Relay Setting On Distribution Transformer Protection System Under Harmonic Condition
title_sort	determination of correction factor for differential relay setting on distribution transformer protection system under harmonic condition
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Kejuruteraan Elektrik & Elektronik
publishDate	2013
url	http://eprints.usm.my/43507/1/Indra%20Nisja24.pdf
_version_	1747821229069303808

Determination Of Correction Factor For Differential Relay Setting On Distribution Transformer Protection System Under Harmonic Condition

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