25
TRT33A Getting Started
5.3
Accuracy
Accuracies defined below are valid at 20
0
C ambient temperature and for results obtained using standard
test cables supplied by IBEKO Power.
5.3.1 Typical accuracies of TRT33A
Typical Ratio Accuracy is given in the table 9:
Table 9:
Typical Ratio Accuracy
Ratio
Range
Typical
Accuracy
Ratio
Range
Typical
Accuracy
Ratio
Range
Typical
Accuracy
Ratio
Range
Typical
Accuracy
0,8
– 999
± 0,05 %
0,8
– 999
± 0,05 %
0,8
– 999
± 0,05 %
0,8
– 999
± 0,05 %
1 000
– 1 999
± 0,1 % 1 000
– 3 999
± 0,1 % 1 000
– 3 999
± 0,1 % 1 000
– 3 999
± 0,1 %
-
-
4 000
– 15 000
± 0,2 % 4 000
– 15 000
± 0,2 % 4 000
– 15 000
± 0,2 %
@ 1 V AC Test Voltage
@ 8 V AC Test Voltage
@ 40 V AC Test Voltage
@ 100 V AC Test Voltage
Typical Excitation Current Accuracy is ± 1 mA. Typical Phase Angle Accuracy is ± 0,05 Degrees.
5.3.2 Guaranteed accuracies of TRT33A
Guaranteed Ratio Accuracy of TRT33A is given in the table 10:
Table 10:
Guaranteed Ratio Accuracy
Ratio
Range
Guaranteed
Accuracy
Ratio
Range
Guaranteed
Accuracy
Ratio
Range
Guaranteed
Accuracy
Ratio
Range
Guaranteed
Accuracy
0,8
– 999
± 0,125 %
0,8
– 999 ± 0,125 %
0,8
– 999 ± 0,125 %
0,8
– 999
± 0,125 %
1 000
– 1 999
± 0,25 % 1 000
– 3 999
± 0,25 % 1 000
– 3 999
± 0,25 % 1 000
– 3 999
± 0,25 %
-
-
4 000
– 15 000
± 0,5 % 4 000
– 15 000
± 0,5 % 4 000
– 15 000
± 0,5 %
@ 1 V AC Test Voltage
@ 8 V AC Test Voltage
@ 40 V AC Test Voltage
@ 100 V AC Test Voltage
Guaranteed Excitation Current Accuracy is ± 2 mA. Guaranteed Phase Angle Accuracy is ± 0,1 Degrees.
5.4
Viewing Results of Previous Tests
TRT33A stores up to 100 Test Records and each can contain 100 Test Readings. They can be viewed in
the
MEM
menu. When the new Test Record is selected, Test Reading automatically starts from position
01. Go to
MEM
menu using
SET
. Press
UP
or
DOWN
to move the cursor through Test Reading. Press
SET
again to go from Test Reading position to Test Record position. Next, pressing on
SET
will return
you to the
CONFIGURATION
menu.
Each Test Reading contains the following:
measured transformer ratio,
percentage error - measured ratios compared with calculated ratios,
excitation current,
phase displacement error,
vector group of transformer under test,
memory position of these results.
