Chapter 10-C445 Ground Fault Monitoring And Protection; Ground Fault Monitoring Methods; Table 66. Residual Ground Fault Parameterization - Eaton Power Xpert C445 User Manual

Chapter 10—C445 Ground Fault Monitoring and Protection
Chapter 10—C445 Ground Fault Monitoring and Protection

Ground Fault Monitoring Methods

Residual Ground Fault Protection
●
Zero-sequence (Core Balance) Fault Protection with
●
Ground Fault Module
Pulse Detection Protection – Low Voltage High Resistance
●
Ground Fault Pulsing Systems (LVHRGPS)
The C445 Motor Management Relay provides three (3)
ground fault monitoring and protection methods for use in
industrial applications. These applications may encompass
solid ground, low resistance ground, high resistance ground,
or high resistance ground systems pulsed ground detection.
Only one (1) protection configuration (Residual or
Zero-sequence) can be active in a system. The C445 can
monitor and respond to an application that has been
configured with a pulsing system. The C445 does not
generate the pulse waveforms required for such systems.
All methods may incorporate Fault Trip, Fault trip Indication
Only, and Fault Warning responses to events that trigger the
C445 protection protocols. Additionally, delay times may be
set for selected parameters to optimize system
performance.

Table 66. Residual Ground Fault Parameterization

Fault
Code Action
4 Fault Trip
Fault Trip Indication Only
Shunt trip
Fault Warning
Fault Trip Delay
Fault Trip Inhibit
Fault Trip Inhibit - Run
208 Power Xpert C445 Global Motor Management Relay MN042003EN—January 2019 www.eaton.com
Modbus Units Frame
1060 Amps C445MA2P4...
C445MA005...
C445MA032...
C445MA045
C445MB072...
C445MC090
C445MC136...
C445M...EXT
1087
1089
1061
—
1064
1065 %
Residual Ground Fault Monitoring and Protection
Residual Ground Fault protection monitors the ground
current of the motor and will react with a Fault action if the
ground current exceeds the set threshold. The Ground Fault
protection is always active. Ground Fault protection may be
set to Fault Trip, Fault Warning, of Fault Trip Indication Only
status.
The vector sum of the 3-phase currents is calculated from
each phase current transformer (CT) in the C445M...
Measurement Module and is transmitted to the C445B...
Base Module for signal processing. At such time the signal
exceeds a user settable threshold, the C445 will react with a
Fault action in accordance with programmed parameters. At
such time the signal returns to the allowable operating range
programmed into the C445, the Fault action will extinguish.
Fault reset requirements such as Manual Reset or
Auto-Reset will occur in accordance with programmed
parameters.
Parameter Value
Min. Max. Default
0.12 2.4 1
0.25 5 3
1 9.6 3
1 13.5 3
3 21.6 3
3 27.0 3
34 40.8 34
30% of 50% of 50% of
CT Primary CT Primary CT Primary
At Powerup
Disable Enable Disable
25 100 50
Debounce (Milliseconds)
Min. Max. Default Modbus
0 60,000 1,000 1063
0 60,000 1,000 1063
0 60,000 1,000 1063
0 60,000 1,000 1063
0 60,000 1,000 1063
0 60,000 1,000 1063
0 60,000 1,000 1063
0 60,000 1,000 1063
0 60,000 1,000 1063
0 60,000 1,000 1063
200 5,000 2,000 1079
0s 5s 0s 1062