Comparative analysis of the diagnostic tools for dissolved gas analysis of HV/EHV oil-filled shunt reactors at the National Grid Corporation of the Philippines (NGCP) South Luzon-B

Date

7-2014

Degree

Bachelor of Science in Electrical Engineering

Major Course

Major in Power Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Athena P. Lavega

Restrictions

Restricted: Not available to the general public. Access is available only after consultation with author/thesis adviser and only to those bound by the confidentiality agreement.

Abstract

This study aimed to have a comparative analysis of the different diagnostic tools for dissolved gas analysis (DGA) of oil-filled shunt reactors in South Luzon - B. The diagnostic tools used were the Key Gas Concentration Method, Doernenburg's Ratio Method, Rogers Ratio Method and the Duval's Triangle 1 Method. The oil samples from the shunt reactors were taken from the shunt reactors of the National Grid Corporation of the Philippines (NGCP) South Luzon - B. The oil samples were analyzed through the Transport X. The results of DGA were interpreted through the diagnostic tools mentioned. The results for the interpretations were analyzed and compared with the findings of NGCP. For the 15 MVAR and 70 MVAR shunt reactors located in the Naga substation, it was observed that the four diagnostic tools and the NGCP findings had the same results that the shunt reactors were experiencing thermal fault was on the temperature less than 700°C, but then the Duval's Triangle 1 implied that the fault was on the temperature less than 300°C which was more specific. For the 35 MVAR shunt reactor 1 located in the Naga substation, it was observed that the three of the diagnostic tools had almost the same results wherein the shunt reactor was experiencing energy discharges by the third quarter. The Doernenburg's Ratio indicated that the fault was due to partial duscharges while the Rogers Ratio indicated that the fault was due to high-energy discharges. For the 35 MVAR shunt reactor 2 posted in the Naga substation, it was observed that two of the diagnostic tools had the same result that the shunt reactor was experiencing fault due to high-energy discharges. NGCP used the Key Gas Concentration Method as their diagnostic tool for the DGA. NGCP did not utilize the Duval's Triangle as part of their evaluation. At this point, the Duval's Triangle 1 Method provided the outcome with the 100% accuracy level as compared to the other tools for the fault identified were highly specific and provides useful description as the fault progresses.

Language

English

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993 2014 E64 /R53

Document Type

Thesis

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