Overview of the power transformer park and diagnostic methods in Latvia

Poiss, Gints; Vītoliņa, Sandra

doi:10.1109/powereng.2015.7266301

Cited by 1 publication

(1 citation statement)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It affects the reliability of the power system, and the failure of a transformer can cause larger incidents with wide-ranging consequences. Many of power transformers in the power transmission system of Latvia have already been in service for 26-40 years [1]; similar situation also is in the USA, Poland and elsewhere in Europe [2][3][4]. Therefore, it is important to ensure safe operation of power transformers and to detect the incipient faults as early as possible, because when the age of the power transformer increases so does the probability of failure [5].…”

Section: Introductionmentioning

confidence: 99%

Study of approaches to incipient fault detection in power transformer by using dissolved gas analysis

Liepniece¹,

Vītoliņa²,

Marks³

2017

energetika

Self Cite

View full text Add to dashboard Cite

To maintain the reliability of power transmission it is important to detect the incipient fault of power transformer as early as possible. If the fault of a power transformer is not detected promptly, it can evolve resulting in high repair costs or even failure of the power transformer and decreasing reliability of power transmission. The most commonly used method for power transformer fault detection is the dissolved gas analysis (DGA) of transformer oil. Various methods have been developed to interpret the data of dissolved gas analysis, but not many are applicable for the detection of the incipient fault. The detection of the incipient fault of a power transformer is included in both IEEE C57.104-2008 “Guide for the Interpretation of Gases Generated in Oil-Immersed Transformers” and Standard of Latvian Electrotechnical Committee LEK 118 “Transformer Oil Inspection Standards”. In both standards, the limits of dissolved gases in transformer oil are divided into levels, each corresponding to different technical conditions of the power transformer including the level that indicates the incipient fault. However, these approaches vary to a great degree – one approach mostly indicates that transformers are in good condition with several cases that must be additionally evaluated, but the second approach mostly results in warning about the incipient fault, which must be confirmed by additional evaluation. The objective of this paper is to determine the most suitable approach to detect the incipient fault of power transformers. A case study is provided, which includes analysis of DGA data of 48 power transformers installed in the transmission network in Latvia with both methodologies mentioned above for detecting the incipient fault.

show abstract

Section: Introductionmentioning

confidence: 99%