P746/EN TD/G31 Technical Data
(TD) 2-2
MiCOM P746
TD
Receiver Optical Characteristics – 100 base
FX interface
(T
A = 0°C to 70°C, VCC = 4.75 V to 5.25 V)
Parameter Sym Min. Typ. Max. Unit
Input Optical Power
Minimum at Window
Edge
P
IN
Min.
(W)
–33.5 –31
dBm
avg.
Input Optical Power
Minimum at Eye
Center
P
IN
Min.
(C)
–34.5 –31.8
dBm
avg.
Input Optical Power
Maximum
P
IN
Max. –14 –11.8
dBm
avg.
Fiber defect connector (watchdog relay) –
Redundant Ethernet board
Connector (3 terminals): 2NC contacts
Rated voltage: 250 V
Continuous current: 5 A
Short duration current: 30 A for 3 s
Breaking capacity
DC: 50 W resistive
DC: 25 W resistive
AC: 1500 VA resistive (cos φ = unity)
AC: 1500 VA inductive (cos φ = unity)
Subject to maxima of 5 A and 250 V
Ratings
AC Measuring Inputs
Nominal frequency:
∗ 50 and 60 Hz (settable)
Operating range:
∗ 45 to 65Hz
Phase rotation:
∗ ABC or ACB
AC Current
Nominal current (In):
∗ 1 and 5 A dual rated.
Nominal burden per phase 1 A:
∗ <0.04VA at rated current
Impedance per phase 1 A:
∗ <40mΩ over 0 - 30In
Nominal burden per phase 5 A:
∗ <0.15VA at rated current
Impedance per phase 5 A:
∗ <8mΩ over 0 - 30In
Thermal withstand:
∗ continuous 4 In
∗ for 10 s: 30 In
∗ for 1 s; 100 In
Linear to 64 In (non-offset AC current).
AC Voltage
Nominal voltage (Vn):
∗ 100 to 120 V phase-phase
Nominal burden per phase:
∗ < 0.02 VA at 110/√3 V
Thermal withstand:
∗ continuous 2 Vn for 10s: 2.6 Vn
Power supply
Auxiliary Voltage (Vx)
Three ordering options:
(i) Vx: 24 to 48 Vdc
(ii) Vx: 48 to 110 Vdc, and 40 to 100Vac (rms)
(iii) Vx: 110 to 250 Vdc, and 100 to 240Vac (rms).
Operating Range
(i) 19 to 65V (dc only for this variant)
(ii) 37 to 150V (dc), 32 to 110V (ac)
(iii) 87 to 300V (dc), 80 to 265V (ac).
With a tolerable ac ripple of up to 12% for a dc
supply, per IEC 60255-11: 1979.
Nominal Burden
Quiescent burden: 12 W
Additions for energized binary inputs/outputs:
Per opto input:
∗ 0.09W…(24 to 54V),
∗ 0.12W...(110/125V),
∗ 0.19W...(220/250V).
Per energized output relay: 0.13W
Per energized high break output relay:0.73W
Power-up Time
Time to power up < 8s.
Power Supply Interruption
Per IEC 60255-11: 1979
The relay will withstand a 20ms interruption in
the DC auxiliary supply, without de-energizing.
Per IEC 61000-4-11: 1994
The relay will withstand a 20ms interruption in
an AC auxiliary supply, without de-energizing.
Note: the use of a E124 extends these limits
In addition to IEC 60255-11 compliance, P746
withstands:
DC Power supply
voltage
DC Power supply interruption
24V 20ms
48V 100ms with Vx ordering option (i),
20ms with Vx ordering option (ii)
110V 200ms with Vx ordering option (ii),
50ms with Vx ordering option (iii)
220V 200ms
Battery Backup
Front panel mounted Type ½ AA, 3.6V
Field Voltage Output
Regulated 48Vdc
Current limited at 112mA maximum output
Digital (“Opto”) Inputs
Universal opto inputs with programmable
voltage thresholds. May be energized from the
48V field voltage, or the external battery
supply.
Rated nominal voltage: 24 to 250Vdc
Operating range: 19 to 265Vdc
Withstand: 300Vdc.
Nominal pick-up and reset thresholds:
∗ Pick-up: approx. 70% of
battery nominal set,
∗ Reset: approx. 66% of
battery nominal set.
Recognition time: 7ms
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