
Sweep Frequency Response Analyzer (SFRA) User Guide
3-14
72A-2570-01 Rev. K 07/2011
6.
Remove temporary static-discharge grounds (
).
Figure 3.23 Removed Temporary Static-Discharge Grounds
7.
Isolate terminals not under test and ensure that they are floating, unless
otherwise specified in the test template.
Step 3: Prepare the Transformer for Testing
For optimal test results, always follow these practices:
•
Make good electrical connections. Clean, file, or wire-brush
connection points at bushing terminals and bases if necessary.
•
Replicate the setup used the last time the transformer was tested.
Any
change in setup affects the consistency of test results.
Do not
change the tap position, DETC position, or core ground connections
from one test to the next.
•
Ensure that all three phases are solidly shorted together when you
make short-circuit measurements.
•
Attach the green reference leads to a stud or bolt at the base of the
bushings under test and ensure that good electrical contact is
established. Replicate the positions of the reference leads on all three
bushings, if possible, to eliminate reference variation as a source of
measurement.
•
Record all relevant information, including tap position, oil level, test
lead position (Black/Red), and terminals of other windings (grounded
or shorted).
SFRA
Instrument
Содержание SFRA
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