PROGRAMMING TESTS VOLTECH AT3600 USER MANUAL
PAGE 3.4.22. VPN 98 - 024 TEST PROGRAM EDITOR
4.11. TRL - TURNS RATIO (BY INDUCTANCE)
The TRL test measures the turns ratio between a pair of windings by comparing their
inductance. This is different from the TR test, which compares the voltage used to
energize one winding, with the voltage induced on a second. The TRL test is
preferable to the TR test when the coupling between the primary and secondary
windings is poor.
An alternating voltage is applied to each winding in turn. The alternating currents
that flow and the applied voltage at the transformer are measured. From these
measured currents and voltages a complex-impedance is derived, and the inductance
is then calculated. The turns ratio is computed by dividing the square root of the
primary inductance by the square root of the secondary inductance.
On selecting ‘TRL Turns Ratio (from inductance)’ from the available tests window, a
dialogue box will be displayed.
To program the test :
1. In the fields provided, insert the voltage and frequency you require for the test
(see chapter 7 - ‘Test Conditions’).
Note also that the Measure button may be used here as outlined in section 3.9 of
this chapter, with the combinations of test parameter specification shown in the
following table:
Voltage
Specified Auto Auto
Frequency
Specified Specified Auto
2. Select (mouse click the button) the integration time you require.
'Medium' is the default setting. 'Long' will give more stable readings (for tighter
limits) at the expense of an increased test time, and 'Short' will test at the
maximum speed, but may give a slightly noisier reading.
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