1. General Information
VFR Voltage Frequency Relay
1.2
Instruction Manual: VFR GBM 06/10/2021
*
D
epending on VFR version
1.9 SPECIFICATIONS
SUPPLY VOLTAGE
80V (115V)
264V (300V) Vac (Vdc)
24Vdc -15%, +10%,
48Vdc -15%, +10%
TEMPERATURE
Operational: -20°C +55°C
Storage temperature:
-30
°C
to +70 °C
DIELECTRIC WITHSTAND VOLTAGE
2 kVac, 60s from all circuits and enclosure
2 kVac, 60s between HLV and LV circuit
ELECTRICAL INSULATION CONSTRUCTION
OverVoltage category: III
Pollution degree: 2
Altitude: 2000m (AMSL)
VOLTAGE INPUTS
Rated Input:
240V/120V Vac (ph-ph/ph-N) 50/60 Hz
VT burden:
0,5 VA max.
Max. Continuous:
300 Vac phase-neutral
System: 3 wires, 4 wires
External VT: Wye/Wye or Delta/Delta
MEASURED PARAMETERS
RMS Voltage*:
AN, BN, CN; AB
+
, BC
+
, CA
+
. For ratings:
See Voltage Inputs.
Voltage Unbalance*:
Range 0
→
100%
Voltage Harmonics*:
Up to 11
th
Frequency*:
Based on Voltage Vab
Range: 60Hz +5,-15Hz
df/dt*:
Based on Voltage Vab
Range: ±0.01Hz/s
→
±5Hz/s
ACCURACY
Voltage:
cl. 1% ± 1 digit
Frequency:
± 0.01 Hz ± 1 digit
df/dt:
± 0.1Hz/s ± 1 digit
DIGITAL INPUT
(2) dry contacts
Max connection lengths: 3mt
Rated Voltage: 5 Vdc internally powered
MAX. POWER CONSUMPTION
7 VA (5 W)
RELATIVE HUMIDITY
Max. 90% (non-condensing)
BURN IN
48 hours at 50 °C
OUTPUT CONTACTS
Aux1, Aux2, Aux3, Aux4, Aux5:
Rated Load: 3A@240Vac (Resistive)
3A@30Vdc (Resistive)
Max Switching Voltage: 277Vac/30Vdc
Max Continuous current: 3A
Aux6, Aux7,Aux8:
Rated load: 8A@ 240Vac Resistive
8A@ 24Vdc Resistive (0,2 A @125 Vdc)
Max Switching Voltage: 400 Vac / 150 Vdc
Max Continuous current: 5 A
COMMUNICATION
RS-485 serial port
Protocol: Modbus RTU-Slave
Insulation: 1.5 kVdc
Bluetooth: 4.2 (for manufacturer use only)
UNDERVOLTAGE MONITORING*
Number of Stage: 1
Required voltage:
>0,5V at voltage inputs, applied in all phases
Pickup level:
30%
→
99% of Vn, Steps: 1%
Reset level:
31%
→
100% of Vn, Steps: 1%
Delay time:
0.1s
→
600s
Steps: 0.01s (from 0.1s to 1s); 0.1s (from 1s to 10s);
1s (from 10s to 600s)
Phases:
Any one, any two, all three (programmable)
Minimum Operation level: 0
→
50% of Vn
Accuracy: See Voltage Inputs
Timing accuracy
: ± 0.1s or 1% setpoint (worst case)
OVERVOLTAGE MONITORING*
Number of Stages: 1
Pickup level:
101%
→
150% Vn (Must be under max input V)
Steps: 1%
Reset level:
100%
→
149% Vn, Steps: 1%
Delay time:
0.1s
→
600s
Steps: 0.01s (from 0.1s to 1s); 0.1s (from 1s to 10s);
1s (from 10s to 600s)
Phases:
Any one, any two, all three (programmable)
Accuracy: See Accuracy
Timing accuracy:
± 0.1s or 1% setpoint (worst case)
PHASE REVERSAL MONITORING*
Delay time:
Fixed
0.5s
Timing accuracy:
± 0.1s
UNDER FREQUENCY MONITORING*
Number Stage:7
Required voltage:
>5.1V at voltage input Vab
Pickup level:
47.0
→
59,9Hz, Steps: 0.1Hz
Reset level:
47.1
→
60Hz, Steps: 0.1Hz
Delay time:
0.1
→
600s, Steps: 0.01s (from 0.1s to 1s);
0.1s (from 1s to 10s); 1s (from 10s to 600s)
Threshold Accuracy: See Accuracy
Timing accuracy
: 35ms max, df/dt Cycle=6, (Pickup-Freq)>=
0,05Hz
25ms max, df/dt Cycle=6, (Pickup-Freq)>=
0,5Hz
or 1% setpoint (worst case)
df/dt Cycle=5 add 10ms to max value
df/dt Cycle=4 add 20ms to max value
OVER FREQUENCY MONITORING*
Number Stage:3
Required voltage:
>5,1V at voltage input Vab
Pickup level:
50.1
→
63Hz, Steps: 0,1Hz
Reset level:
50.0
→
62,9Hz, Steps: 0,1Hz
Delay time:
0.1
→
600s, Steps: 0.01s (from 0.1s to 1s);
0.1s (from 1s to 10s); 1s (from 10s to 600s)
Threshold Accuracy: See Accuracy
Timing accuracy
: 35ms max, df/dt Cycle=6, (Freq-Pickup)>=
0,05Hz
25ms max, df/dt Cycle=6, (Freq-Pickup)>=
0,5Hz
or 1% setpoint (worst case)
df/dt Cycle=5 add 10ms to max value
df/dt Cycle=4 add 20ms to max value
df/dt MONITORING*
Number Stage:2
Required voltage:
>5,1V at voltage input Vab
Pickup level: -
0.6
→
-2.0Hz/s, Steps: 0.01Hz
Startup level: 48.0
→
60.0Hz, Steps: 0.1Hz
Delay time:
0.1
→
3.0s, Steps 0.01s
Threshold Accuracy: See Accuracy
Timing accuracy:
55ms max, df/dt=110% pickup level
15ms max, df/dt=200% pickup level
def: Timing error = Trip time
– (delay time + df/dt cycles)
