Electrical power transformer Is a rather critical piece of equipment, and this makes its installation and maintenance quite a demanding task. Power transformer testing and inspection should ideally begin with the installation of the transformer and continue throughout the life of the transformer. Initial acceptance inspection, testing, and start-up procedures are extremely important. Inspection, both internal and external, will reveal any parts or elements that have been damaged in transit. It will also help you verify that the transformer is made in accordance with the terms of reference. Acceptance tests will also show manufacturing defects if master data for future testing is identified.
Start-up procedures must ensure that the transformer is properly wired and that no hidden defects are present before the transformer is connected. It is necessary to ensure the first switching on of the transformer in accordance with the manufacturer's acceptance documentation. Manufacturers recommend a wide range of acceptance and start-up procedures, and better strictly to them to follow.
The power transformer is the most reliable piece of electrical distribution equipment. With no moving parts, transformers require minimal maintenance and are capable of withstanding overloads, surges, errors, and in some cases even superficial physical damage. While transformers can withstand large amounts of electrical fluctuations, their technical condition deteriorates with increasing service life, and thus transformers need constant monitoring in order to detect and correct problems before they escalate into expensive overhauls. This is where good inspection and testing can save you a lot of money.
High temperature, humidity and pollution (resulting in reduced cooling) are the main enemies of the reliable operation of the transformer. High temperature makes the insulation of the transformer brittle and accelerates chemical reactions if the transformer windings are contaminated with reactive substances. The main task of the maintenance personnel is to maintain the transformer in conditions of normal humidity and ventilation. And also to exclude severe contamination of the surface and windings, because this is what leads to overheating and, as a consequence, premature failure of the transformer. Particular attention should be paid to the cleanliness of the heat-dissipating parts of the transformer, its radiator, timely oil change.
The oil in the transformer should be as clean as possible. Dirt and moisture trigger chemical reactions in the oil that reduce its electrical resistance and cooling ability. If the transformer is open, contamination is the root cause of premature transformer failure. Most of the transformer oil is already contaminated before being charged into the transformer. It is important to determine the dynamics of how strong and how quickly the pollution occurs. This can only be determined by continuously monitoring the quality of the oil at regular intervals. By the nature and speed of oil contamination, conclusions can be drawn about the condition of the transformer,his remaining resource.
Although the methods of maintenance and diagnostics are already very well developed, the main task of the maintenance personnel is to track the main changes in the operation of the transformer, keep a log of routine maintenance and prepare the transformer for overhaul in time.
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