The article presents the most common diagnostic measurements on instrument transformers (current and voltage transformers) used to assess their condition and reliability. The measurements reveal possible failures which can occur due to aging processes during the lifetime of an instrument transformer. The failures are either related to the transformers’ electro-magnetic circuit (for example, short, or open circuits) or to their insulation (for example, partial discharge, moisture ingress). Case studies are presented to underline the importance of conducting regular diagnostic tests
Cellulosic paper and oil insulation in a transformer degrade at higher operating temperatures. Degra...
Infrared Thermography, Ultrasonic Noise Analysis, Partial Discharge Detection, Dissolved Gas Analysi...
This article discusses verification of the ability of a transformer to survive short circuit. Fault ...
Part 1 of this article, published in Volume 3 Issue 4, pages 100ff, describes the measurements of ex...
Basically, the life expectancy of a power transformer is quite long, known to be around forty years ...
Instrument transformers for medium- and high-voltage applications play a key role in energy supply. ...
The condition of the internal cellulosic paper and oil insulation are of concern for the performance...
This article discusses the application of dielectric frequency response for the analysis of the insu...
To prevent unexpected outages it is necessary to implement a field test programme. It has to be deci...
This article discusses verification of the ability of a transformer to survive short circuit. Fault ...
The average age of transformers in service is increasing and approaching the end of design life. Hen...
Power transformers are a key component of electrical networks, and they are both expensive and diffi...
Power transformers are interface between different voltage levels of essential importance. Because o...
Power transformers are interface between different voltage levels of essential importance. Because o...
This paper addresses the subject of condition monitoring and diagnostics of power transformers. The ...
Cellulosic paper and oil insulation in a transformer degrade at higher operating temperatures. Degra...
Infrared Thermography, Ultrasonic Noise Analysis, Partial Discharge Detection, Dissolved Gas Analysi...
This article discusses verification of the ability of a transformer to survive short circuit. Fault ...
Part 1 of this article, published in Volume 3 Issue 4, pages 100ff, describes the measurements of ex...
Basically, the life expectancy of a power transformer is quite long, known to be around forty years ...
Instrument transformers for medium- and high-voltage applications play a key role in energy supply. ...
The condition of the internal cellulosic paper and oil insulation are of concern for the performance...
This article discusses the application of dielectric frequency response for the analysis of the insu...
To prevent unexpected outages it is necessary to implement a field test programme. It has to be deci...
This article discusses verification of the ability of a transformer to survive short circuit. Fault ...
The average age of transformers in service is increasing and approaching the end of design life. Hen...
Power transformers are a key component of electrical networks, and they are both expensive and diffi...
Power transformers are interface between different voltage levels of essential importance. Because o...
Power transformers are interface between different voltage levels of essential importance. Because o...
This paper addresses the subject of condition monitoring and diagnostics of power transformers. The ...
Cellulosic paper and oil insulation in a transformer degrade at higher operating temperatures. Degra...
Infrared Thermography, Ultrasonic Noise Analysis, Partial Discharge Detection, Dissolved Gas Analysi...
This article discusses verification of the ability of a transformer to survive short circuit. Fault ...
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