DIAGNOSIS OF OLTC USING DGA AND STATIC WINDING RESISTANCE TEST
On Load Tap Changer (OLTC) failure occurs is due to the insulation degradation and contacts failure inside it. Other than that, contacts wear influences the OLTC performances. The worn contacts will cause hotspots in the OLTC tank and cause the insulating oil to degrade faster. As a result, thi...
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| Main Authors: | , , , , |
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| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
2012
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| Subjects: | |
| Online Access: | http://eprints.utem.edu.my/id/eprint/6756/1/ICEI_2012_Mohd_Shahril.pdf http://eprints.utem.edu.my/id/eprint/6756/ |
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| Summary: | On Load Tap Changer (OLTC) failure occurs is
due to the insulation degradation and contacts failure inside
it. Other than that, contacts wear influences the OLTC
performances. The worn contacts will cause hotspots in the
OLTC tank and cause the insulating oil to degrade faster.
As a result, this will lead to the damage of complete
transformer unit. Thus, the research work that has been
carried out applied the Dissolved Gas Analysis (DGA) via
latest Duval Triangle method during the diagnosis of OLTC
rated at 33/11kV, 30MVA at the first stage to provide early
indication of OLTC�s breakdown. The Static Winding
Resistance Test is then applied at the second stage to figure
out any increase of contact resistances for all phases. In
addition, it is expected to have a relationship between both
results. The results showed that it was proven that by
performing DGA via latest Duval Triangle method, the
early indication of OLTC�s breakdown can be obtained.
Besides, this paper revealed that the Static Winding
Resistance Test was capable to provide any sign of bad
contacts in fixed condition as well as looses connections. |
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