Eaton Power Xpert C445 - Table 67. Zero-Sequence Ground Fault Parameterization; Table 68. C445 Zero-Sequence Current Transformers

Chapter 10—C445 Ground Fault Monitoring and Protection
Power Xpert C445 Global Motor Management Relay MN042003EN—January 2019 www.eaton.com 209
Zero-sequence Ground Fault Monitoring and
Protection
The zero sequence sense current transformer (also called
core balance current transformer, window current
transformer, or toroidal current transformer) is the basis for
sensitive ground fault protection of motors.
When Ground Fault Module (GFM) is recognized, the C445
system no longer uses current information from the
C445M… measurement module for ground fault current
calculations. The measurement module is still used for
current, voltage, and power information including overload
protection that is provided to the C445B… base module.
Table 67. Zero-sequence Ground Fault Parameterization
Zero-sequence Ground Fault monitoring requires the use of
an external zero-sequence CT that is connected to a
C445XG-MOD adapter module (GFM) coupled to a
zero-sequence CT. Current sense range for the Ground Fault
Module (GFM) is 0.03 – 10.0 Amps which encompasses all
four (4) C445XG-CT… current transformers.
Table 68. C445 Zero-sequence Current Transformers
The C445XG-MOD GFM may be either DIN rail mounted or
directly mounted with screws by utilizing the optional
mounting tabs. The GFM has two (2) RJ12 terminals to
enable easy connection to the C445 system with
D77E-QPIP… cabling used on the base and measurement
modules. Connection to the CT is made via a screw terminal
connector on the GFM and screw terminals on the CT.
Note: If the C445 has been powered up and configured prior
to connecting the GFM and/or the D77E-QPIP…
cables have been moved to different RJ12 terminals, a
Repair action may be necessary to reconfigure the
C445 system.
Parameter Value Debounce (Milliseconds)
Fault
Code Action Modbus Units Frame Min. Max. Default Min. Max. Default Modbus
4 Fault Trip 1060 Amps C445XG-CT… 0.03 10.0 4 0 60,000 1,000 1063
Fault Trip Indication Only 1087 Amps C445XG-CT… 0.03 10.0 4 0 60,000 1,000 1063
Shunt trip 1089 Amps C445XG-CT… 0.03 10.0 4 0 60,000 1,000 1063
Fault Warning 1061 Amps C445XG-CT… 0.03 10.0 3.4 200 5,000 2,000 1079
Fault Trip Delay At Powerup 0s 5s 0s 1062
Fault Trip Inhibit 1064 Disable Enable Disable
Catalog Number Current (A) Aperture
C445XG-CT2 45 28mm round
C445XG-CT3 90 52mm round
C445XG-CT4 135 63mm round
C445XG-CT7 800 175mm(w) x 80mm (h)