VOLTECH AT3600 USER MANUAL TRANSFORMER TESTS
TESTS AND TEST CONDITIONS VPN 98 - 024 PAGE 7.1.53.
1.31. WATX - WATTAGE (EXTERNAL SOURCE)
WHERE USED
The Wattage test measures the power needed to energise a particular winding, usually
the primary, with the remaining windings open circuit. It is usual to configure the test
signal to the normal operating conditions of the transformer to determine the power
needed to energise the transformer.
This test uses an external source to provide the test signal which must be coupled to
the tester via a Voltech AC Source Interface (contact your supplier for details). See
the AC Source Interface user manual or the Editor help system for details of how to
configure external ac sources for use with an AT3600.
This test is suitable for line frequency transformers (25-400Hz) and checks the no
load losses in the transformer.
MEASUREMENT CONDITIONS
During the Wattage (External Source) test, a constant, user specified ac voltage from
an external source is applied across the winding in question. All other windings are
held open circuit during this test.
The AT3600 measures the voltage across and current through the winding. The
Wattage is the product of the in phase components of the current and voltage.
If, in the program, the WATX test follows either a VOCX or MAGX 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 5KHz, and an amplitude
from 5V to 600V depending on the type of external source used. The current rating of
a single AC Source Interface is 10A rms. See also the WATT test which uses the
AT3600s internal generator which can provide up to 270V ac at 40W.
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