Advertisement
1. Introduction
GRD150 feeder manager relay is designed for protection, control, monitoring and metering of
medium voltage networks.
The GRD150 series provides the following protection functions.
• Non-directional and directional overcurrent and earth-fault protections
• Non-directional and directional sensitive earth fault protection (depending on the relay
models)
• Non-directional and directional negative phase sequence overcurrent protection
• Undercurrent protection
• Thermal overload protection
• Broken conductor detection
• Circuit breaker failure protection
• Cold load pick-up feature
• Overvoltage and undervoltage protection
• Zero phase sequence overvoltage protection
• Negative phase sequence overvoltage protection
• Frequency protection (over-/under-frequency and frequency rate-of-change)
• Autoreclose function (depending on the relay models)
The GRD150 series provides the following 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 (depending on the relay models)
• MIMIC configuration picture
The GRD150 series provides the following monitoring and metering functions.
• 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.
The GRD150 series provides the following recording function.
• 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
⎯
⎯
9
6 F 2 S 0 8 4 2
Advertisement
