Raytech USA, Inc.
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9
OPERATION
After following the connection instructions previously listed, switch on the power to the TR-Spy
or Mark II and also on the T-Rex. (Power on sequence is not critical as the TR-Spy or Mark II
and the T-Rex communicate constantly). After a 2 second delay both systems should turn on.
The T-Rex should have all three phase lamps illuminated and the TR-Spy or Mark II should have
the display screen illuminated.
The first step in operation of the T-Rex is to ascertain the correct Vector phasing (Phase
displacement) of the transformer under test if unknown
(See also “
Test Result Notes
”
on the
next page). This can be accomplished by running a standard Ratio test on the transformer using
the TR-Spy or Mark II.
If the Phase displacement is known proceed to step 2.
1. Select the correct transformer configuration on the TR-
Spy or Mark II then select “?” if the
Vector phasing is unknown. Run a standard ratio test (refer to the TR-Spy or Mark II
manual). The TR-Spy or Mark II will display the correct vector phasing at the completion of
the test.
2. Select the following screen on the TR-Spy or Mark II to initialize operation of the T-Rex:
T-Rex Operation screen
3. Enter the Phase displacement number
or enter “0”.
Note 1: The Phase displacement (number 11 shown in the example) should be the same as
previously tested. The Phase displacement number can be changed if desired.
Note 2: By selecting the Phase displacement prior to testing, the actual phase result will be the
most accurate phase result obtainable. The displayed phase is then added or subtracted
from the vector setting. For example: Phase displacement of 1 is set and the instrument
shows 0.13º result. The actual phase displacement is 30.13º
4.
Press “GO” then “ALL” on the TR
-Spy or Mark II and the test sequence will check,
calibrate, and test each phase sequentially (A, B, C) while applying three phase voltage to the
transformer.
5. The Results of the voltage ratio and phase relationship will be displayed on the TR-Spy or
Mark II screen.
6. End of Test. It is now possible to print or store the test results.
(see the TR-Spy or Mark II manual)
