The transformer cabinet is similar to the capsule type structure, consisting of cabinet, corrugated core, pipeline, oil level meter, etc. The cabinet and the core system is formed into a runway shape, the core material is stainless steel
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Separate primary and secondary windings facili-tate high voltage input/output isolation, especially important for safety in off-line applications. Ideally, a transformer stores no energy–all energy is transferred instantaneously from input to output. In practice, all transformers do store some undesired energy:
If the transformer is installed in an enclosure, the enclosure should be cleaned like switchgear cubicles. Dust accumulation on the enclosure ventilation opening is an indication that an intemal inspection should be made. In addition to cleaning the following should also be carried out during the inspection:
If the transformer is permanently on, it will eventually burn out and cease working. Then again, if it is frequently switched on and off, it will eventually burn out and cease working. Having the transformer permanently on will likely use more electricity. How much more will depend on the efficiency of the transformer.
Before starting maintenance work, the transformer has to be disconnected from the network and earthed. When the circuit breaker and the isolator have been opened, they shall be locked in an open position to prevent inadvertently closing during maintenance work. Items to be considered are:
The transformer is only de-energised for a few hours when the equipment is connected and disconnected from the transformer. If the oil is in good condition, except from particles present in the oil, filtering can be recommended for removal of the particles. Often it is recommended to do both drying and reclaiming on the same transformer.
In consumer or industrial applications, a trans-former temperature rise of 40-50°C may be accept-able, resulting in a maximum internal temperature of 100°C. However, it may be wiser to use the next size larger core to obtain reduced temperature rise and reduced losses for better power supply efficiency.
