Air cooled Transformer
Alternating Current (AC)
An electrical current flow of continuously changing polarity, which rises to a maximum voltage in one direction, decreases to zero and then sinks to the maximum voltage in the other direction before changing polarity once again. This pattern is referred to as a sinusoidal wave and the number of cycles per second is equal to the frequency, which is measured in Hertz.
Ambient Noise level
The level of acoustic noise existing at a given location like room or compartment etc. Ambient noise level is measured based on sound level meter or in decibels (db).
ANSI was formed in 1918. American National Standards Institute is a recognized body which approves standards for transformers. ANSI 89.1 is mostly used for dry type transformers.
The amount of voltage present between electrodes of different potential or between an electrode and ground. The magnitude is determined by the distance between electrodes and the dielectric constant of the medium surrounding them.
BIL Basic Insulation level
It is an insulation system that can withstand very high voltage surges.
The ferrous center part of a transformer or inductor used to increase the strength of the magnetic field. It carries the flux and forms the magnetic coupling between primary and secondary.
Current Transformer (CT)
The connection between a delta source and a wye load.
Drive Isolation Transformer
The percentage of time a transformer will be supplying the Full Rated Power to the load. Percentage of time a unit is expected to perform at Full Rated power versus time spent in idle can significantly affect the physical size of a transformer.