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GRD150
FEATURES
Protection functions
Non-directional and directional overcurrent and
earth-fault protection and sensitive earth fault
protection (option)
Overvoltage and undervoltage protection
Thermal overload protection
Underfrequency or overfrequency protection
Negative phase sequence overcurrent
protection
Undercurrent protection
Circuit breaker failure protection
Autoreclose function (option)
Control functions
Indication of the status of switching devices, i.e.
circuit breakers and disconnectors
Open and close commands for switching
devices
Synchronism check function (option)
MIMIC configuration display
Monitoring and Metering
Circuit breaker condition monitoring
Trip circuit supervision
Metering: three-phase currents and voltages,
residual current and voltage, frequency, active
and reactive power, power factor, and max.
demand values.
Recording
Event record: 480 most recent events
Alarm record: 32 most recent alarms
Fault record: 8 most recent faults
Disturbance record: 9 analog and 32 binary
signals
User Interface
Menu-based HMI system
Graphical LCD display
PLC function
Configurable binary inputs and outputs
Configurable LED indications
Communication Interface: RS485, Fibre optic
or Ethernet LAN (option)
APPLICATION
GRD150 feeder manager is designed for protection,
control, metering and supervision of medium voltage
networks.
GRD150 includes multiple, high accuracy, overcurrent
protection elements (for phase and/or earth fault) with
inverse time (IDMTL) and definite time delay (DTL)
functions. All phase, earth and sensitive earth fault
overcurrent elements can be independently subject to
directional control. The directional elements provide
user-settable characteristic angles.
Other protection functions are also available, including
thermal protection to IEC60255-8, negative sequence
overcurrent protection, under/overvoltage and under/
over frequency protections.
GRD150 provides continuous monitoring of internal
circuits and of software. External circuits are also
monitored, by trip circuit supervision, CT and VT
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
Alarm recording
Disturbance recording (available via
communications ports)
Figure 1 - Front View
2
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