GRD110
2
FEATURES
Overcurrent protection for phase and earth
faults with IDMTL or DTL.
Three instantaneous elements with DTL.
Programmable reset characteristics.
Sensitive earth fault protection (SEF).
Restricted earth fault protection
Undercurrent protection with DTL.
Thermal overload protection.
Negative phase sequence overcurrent
protection (NPS).
Broken conductor detection.
Circuit breaker fail protection.
Inrush current detector for blocking differential
and/or overcurrent trip at energisation.
Cold load pick-up feature.
Five shot, three phase auto-reclose (six trips to
lockout).
Sequence co-ordination with in-series auto-
reclosing devices.
Four settings groups.
Configurable binary inputs and outputs.
Circuit breaker condition monitoring.
Trip circuit supervision.
Automatic self-supervision.
Menu-based HMI system.
Configurable LED indication.
Metering and recording functions.
Communication for remote setting and data
download is provided via the RSM (Relay
Setting and Monitoring) system.
Front mounted RS232 serial port for local PC
communications.
Rear mounted RS485 or fibre optic serial port
for remote PC communications.
The IEC60870-5-103 protocol is provided for
communication with substation control and
automation systems.
APPLICATION
The GRD110 is a range of fully numeric multi-function
protection relays. GRD110 has five models which
differ according to the number and type of current
inputs fitted, see Table 1.
Table 1 - GRD110 Models
Model
Configuration
GRD110-110 Earth Fault and Sensitive Earth Fault
GRD110-400 Three Phase Fault and Earth Fault
GRD110-420 Three Phase Fault, Earth Fault and
Sensitive Earth Fault
GRD110-500 Three Phase Fault and Earth Fault
and Auto-reclose
GRD110-520 Three Phase Fault, Earth Fault,
Sensitive Earth Fault, and Auto-reclose
All models include multiple, high accuracy, overcurrent
protection elements (for phase and/or earth fault) with
inverse time and definite time delay functions. Other
protection functions are available according to model
type, including phase undercurrent protection with
definite time delay, thermal protection to IEC60255-8,
negative sequence overcurrent protection and a broken
conductor detection feature, see Table 2.
All models provide continuous monitoring of internal
circuits and of software. External circuits are also
monitored, by trip circuit supervision and CB condition
monitoring features.
A user-friendly HMI is provided through a backlit LCD,
programmable LEDs, keypad and menu-based operating
system. PC access is also provided, either for local
connection via a front-mounted RS232 port, or for remote
connection via a rear-mounted RS485 or fibre optic
port. The communication system allows the user to
read and modify the relay settings, and to access data
gathered by the relay’s metering and recording functions.
Data available either via the relay HMI or
communications ports includes the following functions.
Metering
Fault recording
Event recording
Disturbance recording (available via
communications ports)
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Summary of Contents for GRD110
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