The fault free operation of power transformers is a factor of major economic importance and safety in power supply utilities and industrial consumers of electricity. In the current economic climate, Industries/Supply Utilities tighten their control on capital spending and make cutbacks in maintenance, an increased awareness is placed on the reliability of the existing electric power supply. Down time is at a premium. Often, the loading is increase on present units, as this will defer purchasing additional plant capacity. Th us, the stress on the transformer increases. The net total effect of the thermal, electrical and mechanical stress brought on by increased service needs to be monitored to ensure reliability. 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. Transformer oil testing is a proven loss prevention technique that shall be a part of any condition based predictive maintenance program. Essentially, an early warning system, transformer oil testing allows management to identify maintenance priorities, plan work assignment schedules, and order necessary parts and materials. In this course, you will start by refreshing the basic of transformers, transformer oil properties and specification and you will learn if your transformer oil is within specifications and the principle of the analysis method used for the transformer oil analysis and their relevant standard methods used. This course will also cover the working principles of transformers including its applications, operation and performance parameters; the chemistry of transformer oil, characteristic properties and specification, physical properties, electrical properties, storage, handling and transport as well as compatibility and contaminants; the insulating of oils, fluids and gases; the principles of transformer oil testing instrumentation; the transformer oil testing; and the presentation of results.