During every test, low voltage (less than 1V) is ap-
plied as a safety and connection test. If no safety or
connection failures are found, the test progress as
per the test mode selection.
Auto test mode uses the results of the safety and
connection test to determine
1. If the turns ratio test can be performed in step up
mode, and
2. If a 3Ø turns ratio test is possible. If a 3Ø test is
not possible, a 1Ø test is executed if no safety or
connection issues are present
In auto test mode, magnetic balance chooses the
winding to excite and measure in the following
priority order:
• Wye winding on secondary (Step Up)
• Wye winding on primary if secondary/tertiary is not
a Wye (Step Down)
• Secondary winding if neither winding is a Wye
(Step Up)
If auto mode is not selected, then the magnetic bal-
ance test will excite the winding selected in the test
mode.
Step up applies voltage to the secondary/tertiary and
induces voltage on the primary.
Step down applies voltage to the primary and induc-
es voltage on the secondary/tertiary.
3Ø applies and measures voltage on all three phases
simultaneously
1Ø applies and measures all three phases individually
When a test completes successfully, the screen be-
low will be displayed.
5.23.3 Magnetic Balance
Test Modes
5.23.4 Magnetic Balance
Test Success
Magnetic Balance provides turns ratio
results and Magnetic Balance results.
Magnetic Balance is always performed
with 1Ø excitation
Information subject to change without notice 45
Operation
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