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BESTCOMSPlus Navigation Path: Settings Explorer, System Parameters, Transformer Setup
HMI Navigation Path: Settings Explorer, System Parameters, Transformer Setup
Setting
Tap Calculation Mode
MVA Rating
kV Rating
Tap
CT Connection
Phase CT Ratio
Transformer Connection
Ground Connection
Differential Circuit
Polarity
Phase Relationship
Connection Settings for Current Differential
When the zone of protection includes a transformer, it may be necessary to provide phase angle and zero
sequence compensation to the currents used by the Phase Current Differential Protection (87) element.
See Figure 271 and Figure 272. For each input circuit, a setting is provided to enter the transformer
connections associated with that input.
Configuration
Figure 270. Transformer Setup Screen
Table 114. Transformer Settings
Range
Manual or Automatic
0.5 to 10,000
0.01 to 1,000
2 to 20 (5A CTs) or 0.4 to 4 (1A CTs)
Set on the Sensing Transformers screen
Set on the Sensing Transformers screen
WYE, DAB, DAC, ZAB, ZAC, NA
Yes or No
Primary, Secondary, or None
Yes or No
A, B, or C
9424200994 Rev N
Increment
Unit
Default
n/a
n/a
Manual
0.1
n/a
n/a
n/a
0.01
n/a
2.00
n/a
n/a
n/a
n/a
n/a
n/a
WYE
n/a
n/a
n/a
n/a
Primary
n/a
n/a
n/a
n/a
BE1-11g
0.5
n/a
n/a
n/a
No
No
A
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Troubleshooting
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