2.45 WATT - Wattage
The Wattage test is a measure of the input power required to energize a
transformer at no load.
A Wattage test is an excellent check on the magnetic quality of the iron
core and the magnetic joints and would typically be used with iron core
transformers with an operating frequency of around 50Hz.
During the Wattage test, a constant, user specified ac voltage is applied
across the winding in question. All other windings are held open circuit
during this test.
The AT measures the voltage across and current through the winding. The
Wattage is the product of the in phase components of the current and
If, in the program, the WATT test follows either a VOC or MAGI test which
has the same test conditions (voltage and frequency), and is applied to
the same winding, then the measurement results from the previous tests can
be re-used, saving program execution time.
The test signal can have a frequency in the range 20Hz to 1.5KHz, and an
amplitude from 1V to 270V.