- Tests and evaluation - Understand liquid tests including dielectric breakdown, neutralization, interfacial tension, color, visual condition, power-factor, and water-content tests, as applicable. Perform oxygen content tests in transformers. Recognize fault gases commonly found in insulating liquids.
- Transformer Oil Sampling [PDF] This article discuss transformer oil sample tests other than dissolved gas analysis (DGA).
- Dielectric Response Analysis of Transformers [PDF] There are new tests available to the power industry where more complete diagnosis can be performed. Tests such as sweep frequency response analysis and dielectric response analysis make the high-end diagnosis possible for transformers, motors, generators, and cables.
- What is Sludge? [PDF] The development of sludge in a transformer is deleterious and presents a number of problems.
- Transformer Insulating Oil Test Methods (ASTM) Know the most common ASTM insulating oil tests and the significance of each.
- Polychlorinated Biphenyls (PCBs) Understand current EPA regulations regarding PCB content in insulating oils.
- Transformer Insulating Oil and Types of Transformer Oil An introduction to transformer insulating oil.
- Causes of Hydrogen Gas in Transformers If hydrogen is the main gas being produced in significant quantities, the likely causes may be stray gassing of the oil or partial discharges in the transformer.
- A Guide to Transformer Oil Analysis [PDF] Regular sampling and testing of insulation oil taken from transformers is a valuable technique in a preventative maintenance program. If a proactive approach is adopted based on the condition of the transformer oil, the life of the transformer can be extended.
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