Basler BE1-CDS220, Instruction Manual

Page: 55 / 476

BE1-CDS220 Input And Output Functions 3-7
Table 3-2. Continued, CT Input Circuit Settings
Transformer Connection CT Connection Compensation
Normal
Phase
Sequence
CT Input
Circuit 1
CT Input
Circuit 2
CT Input
Circuit 1
CT Input
Circuit 2
CT Input
Circuit 1
CT Input
Circuit 2
DAC DAC
WYE WYE WYE (NONE) WYE (NONE)
WYE DAB DAB WYE (NONE)
WYE DAC DAC WYE (NONE)
DAB WYE WYE (NONE) DAB
0
°
LAG DAC WYE WYE (NONE) DAC
DAB DAB WYE (NONE) WYE (NONE)
DAC DAC WYE (NONE) WYE (NONE)
0
°
LAG
DAC DAB WYE WYE DAB DAC
WYE DAC DAB WYE (NONE)
DAB WYE WYE (NONE) DAC
DAB DAC WYE (NONE) WYE (NONE)
60
°
LEAD
60
°
LAG
Additionally, as described in Section 1, General Information, Differential Protection Application
Considerations, Problem 5, if there is a ground source within the protected zone, the user can apply a
numerical, zero sequence trap to remove the zero sequence components from the current to prevent
misoperation on external ground faults. This setting is optional. It is not required to enter a ground source
NOTE
The CT input circuit settings are used by the auto-tap calculation function to
calculate the correct tap adjustment factor for the differential functions. When
entering these settings via the ASCII command interface, the validation routine
and auto-tap calculation is performed on exit after all parameters have been
entered.
When entering these settings using the optional HMI, the validation routine and
auto-tap calculation is performed on exit of each screen. This may cause an out
of range error message from the auto-tap calculation function. The user is
advised to enter valid CT input circuit settings on screen 6.3.1.1,
SETUP\PWR_S\CON\CTP prior to entering the auto-tap calculation settings. If
the user has previously set the auto-tap calculation settings and needs to change
the CT input circuit settings, it may be necessary to temporarily change the auto-
tap function setting to manual on screens 5.1.1.3, 5.2.1.3, 5.3.1.3, and 5.4.1.3,
\PROT\SG#\87\TAP in order to enter the new CT settings.
See Section 4 Protection and Control, Phase Differential Protection for more
information on the auto-tap calculation function.
A
B
C
A
C
B
A
B
C
A
C
B