Transformers

 

A view of the oil cooling tubes of a transformer. (Approx. 1500 KVA)


Notice that the outer cooling tubes are cooler than the inner cooling tubes, this is due to a low oil level. When carrying out surveys of transformers, the HT and LT cable boxes are surveyed to determine if there are any problem areas on the cable terminations

LT cables exiting transformer box.


Heat pattern appears to be from gland nuts inside terminal box. Glands would be heating up due to induced eddy current Notice the temperature difference in the cables would indicate that a higher current is been drawn in this phase.

View of the LT cables exiting the cable box on a transformer


The heat pattern indicates a problem inside the cable box which could be due to either faulty lug crimp on the cable or a faulty cable terminal.

View of core windings of a transformer prior to assembly


This image was taken as pat of a series of images to determine the temperature rise on the core as the current drawn is increased. This was undertaken as a quality control prior to assembly by a company repairing a transformer.