Technical Data P746/EN TD/G31
MiCOM P746
(TD) 2-3
TD
Output Contacts
Standard Contacts
General purpose relay outputs for signalling,
tripping and alarming:
Rated voltage:
∗ 300 V
Continuous current:
∗ 10 A
Short-duration current:
∗ 30 A for 3 s
Making capacity:
∗ 250A for 30 ms
Breaking capacity:
∗ DC: 50W resistive
∗ DC: 62.5W inductive (L/R = 50ms)
∗ AC: 2500VA resistive (cos φ = unity)
∗ AC: 2500VA inductive (cos φ = 0.7)
Response to command:
∗ < 5ms
Durability:
∗ Loaded contact: 10000 operations
minimum,
∗ Unloaded contact: 100000 operations
minimum.
Fast operation and High Break Contacts
Dedicated purpose relay outputs for tripping:
∗ Uses IGBT technology
Make and Carry:
∗ 30 Amps for 3 sec, 30A @ 250V resistive
Carry:
∗ 250 Amps dc for 30ms
Continuous Carry:
∗ 10 Amps dc
Break Capacity:
∗ 10 Amps @ 250V resistive (10,000
operations) 10 Amps @ 250V L/R=40ms
Operating time:
∗ <200us & Reset time: 7.5ms
Watchdog Contacts
Non-programmable contacts for relay
healthy/relay fail indication:
Breaking capacity:
∗ DC: 30W resistive
∗ DC: 15W inductive (L/R = 40ms)
∗ AC: 375VA inductive (cos φ = 0.7)
IRIG-B 12X Interface (Modulated)
External clock synchronization per IRIG
standard 200-98, format B12X.
Input impedance 6kΩ at 1000Hz
Modulation ratio:
∗ 3:1 to 6:1
Input signal, peak-peak:
∗ 200mV to 20V
IRIG-B 00X Interface (Un-modulated)
External clock synchronization per IRIG
standard 200-98, format B00X.
Input signal TTL level
Input impedance at dc 10kΩ
Environmental Conditions
Ambient Temperature Range
Ambient temperature range
Operating temperature range
–25
°C to +55°C (or –13°F to +131°F)
Storage and transit
–25
°C to +70°C (or –13°F to +158°F)
Tested as per
IEC 60068-2-1: 2007
-25
°C (–13°F) storage (96 hours)
-40
°C (–40°F) operation (96 hours)
IEC 60068-2-2: 2007
+70
°C (+158°F) (storage (96 hours)
+85
°C (+185°F) operation (96 hours)
Ambient Humidity Range
Per IEC 60068-2-3: 1969:
∗ 56 days at 93% relative humidity and +40
°C
Per IEC 60068-2-30: 1980:
∗ Damp heat cyclic, six (12 + 12) hour cycles,
93% RH, +25 to +55 °C
Corrosive Environments
Per IEC 60068-2-60: 1995, Part 2, Test Ke,
Method (class) 3
Industrial corrosive environment/poor
environmental control, mixed gas flow test.
21 days at 75% relative humidity and +30°C
Exposure to elevated concentrations of H2S,
NO2, Cl2 and SO2.
Type Tests
Insulation
Per IEC 60255-27: 2005,
∗ Insulation resistance > 100MΩ at 500Vdc
(Using only electronic/brushless insulation
tester).
Creepage Distances and Clearances
Per IEC 60255-27: 2005
∗ Pollution degree 3,
∗ overvoltage category III,
∗ impulse test voltage 5 kV.
High Voltage (Dielectric) Withstand
(EIA RS232 ports excepted).
(i) Per IEC 60255-27: 2005, 2 kV rms, AC, 1
minute:
Between all case terminals connected together
and the case earth.
Also, between all terminals of independent
circuits.
∗ 1kV rms AC for 1 minute, across open
watchdog contacts and across open
contacts of changeover output relays.
(ii) Per ANSI/IEEE C37.90-1989 (reaffirmed
1994):
∗ 1.5 kV rms AC for 1 minute, across open
contacts of changeover output relays.
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