Voltech AT5600, Руководство пользователя

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C H A P T E R 7 – T E S T S A N D T E S T C O N D I T I O N S
AT5600 User Manual 98-119 issue 14
Page 145
7.32. WATX - Wattage (External Source)
Where Used
The Wattage test measures the power needed to energize 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 energize 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 AT5600.
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 AT5600 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 AT5600s internal generator which can provide up to 270V AC
at 25W.