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1. General Information
VFR Voltage Frequency Relay
1.1
Instruction Manual: VFR GBM 06/10/2021
1.
General Information
(*) The following options are available depending on the VFR model version
[
General Information: 1.9 ORDER CODE
].
1.1 DESCRIPTION
The device has been designed for continuous monitoring of the system’s voltage, frequency and related variations. It is able to
disconnect one or more loads in case of underfrequency (up to 7 stages) or frequency negative rate of change (up to 2 stages).
The VFR protects industrial and commercial power networks in case of voltage disturbances.
1.2 APPLICATIONS
•
Commercial, industrial and public utility
1.3 DIGITAL MEASUREMENT*
•
Phase and Line Voltages
•
Phase Sequence
•
Voltage Average
•
Voltage Unbalance
•
Voltage THD
•
Voltage Harmonics
•
Frequency (Hz)
•
Frequency variation (negative rate of change df/dt)
1.4 FEATURES
•
Digital input functions:
o
Remote TRIP
o
Remote RESET
1.5 APPLICABILITY
•
Systems: Wye or Delta three-phase
•
Frequency: 60 Hz
•
Voltage: up to 277/480Vac (direct measure) or up to 65kV with external VT
1.6 COMMUNICATION
•
RS485 port, Modbus RTU Protocol
1.7 SIGNALLING AND PROGRAMMING
•
Graphic LCD & LED based HMI
•
Indication of fault conditions
•
Indication of the relay status
•
Available leds:
Led
Description
Duty Cycle
Status
-Slow blinking: the device is switched ON and the self-diagnosis has not encountered any
problems.
-Fast blinking: this means an error in discrepancy, flash memory, RAM memory, ADC or
Bluetooth BLE. See [
Troubleshooting]
.
OFF = 3s
ON = 0.1s
OFF = 0.3s
ON = 0.3s
Memory
If ON: a new event has occurred
It will turn OFF after RESET or after access to the EVENT LIST
-
Trip
If ON: the protection function has activated the related relay.
It will turn OFF after RESET
-
In case of discrepancy, check
[Troubleshooting]
.
1.8 PROTECTION AND FUNCTIONALITY*
•
Over Voltage
•
Under Voltage
•
Phase Sequence
•
Underfrequency (up to 7 stages)
•
Overfrequency (up to 3 stages)
•
df/dt (up to 2 stages)