Rogramming Ints And Ips - Voltech AT3600 User Manual

C P
REATING THE ROGRAM
3.13. P
The following is a list of points that should be remembered when you are creating
your test programs.
1.
When you are creating your test programs, you should work in the following order:
Note: If you make any changes to the schematic after you have created the list of
i
tests, then some tests may be inadvertently deleted. Examples where this may
happen are: deleting a winding or a terminal, and renaming a terminal.
2.
P 3.3.32.
AGE
ROGRAMMING
Create your schematic first.
a. Initially, create the schematic.
b. Then, set up the program options.
c. Finally, create the list of tests that make up the program.
Use the recommended order for the tests in the program.
The actual tests used in the program are of course dependent on the type of
transformer to be tested, and the number of parameters you have chosen to test.
However, it is recommended that you generally do the tests in the following
order:
a. Continuity.
To detect a transformer not correctly plugged into the test fixture, and any
open circuit windings.
b. Primary inductance or magnetizing current
To detect faulty core material, and the wrong number of primary turns.
c. Turns ratios or open circuit voltages
To detect any windings with the wrong number of turns.
d. Isolation tests such as Insulation Resistance
To detect poor interwinding isolation where safety is not an issue, for
example between two secondary windings.
e. Safety tests such as Hi-Pot
To detect poor interwinding isolation; but this time where safety is an issue,
for example, from a primary winding to a secondary winding on a mains
isolation transformer.
In the above list, items b and c will depend on the type of transformer:
For ferrite cored transformers operating at frequencies higher than 1kHz, it is
preferable to measure the primary inductance and the turns ratios between
windings.
For iron cored transformers operating at the 50 or 60Hz line frequency,
where normal operation extends to the point of core saturation, magnetizing
current and open circuit voltage measurement are normally the preferred
tests.
3. Use test limits which are as wide as possible.
For example, if you are testing the turns ratio between windings where the
actual number of turns on one of the windings is only 10, specify limits of ±
5% (which is equivalent to half a turn).
4. Make use of the Measure button.
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