Microelettrica Scientifica

50/51, 87T, 87N/51N

F50/51 : Two phase fault levels (side 1 and side 2)
F87T : Two phase differential level
F87N/51N : Restricted earth fault (side 1 and side 2)
Trip circuit supervision
Associated Circuit Breaker control (OPEN / CLOSE)
Breaker failure protection
Breaker interruption energy ∑i2t
IA,IB,IC : Current
dA,dB,dC : Differential current
2H,5H : 2nd & 5th Harmonic detection current
Io : Neutral current
Event Recording (last 100 events)
Trip Recording (last 10 trips with date & time)
Oscillographic Recording of input quantities (8 chanels, 32 sample/cycle, 2sec each)
Time tagging resolution 1ms
2 Setting programs
6 Output Relays
4 Digital Inputs
CAN BUS port for Input/Output expansion modules connection
Local push-buttons for C/B control
1 RS232 Serial communication port on front face
1 RS485 Serial communication port on rear side
Synchronization with other relays
Multilanguage Display (English, Italian, available - other on request)
Modbus RTU or IEC60870-5-103 communication protocols
Blocking input and Blocking output for pilot wire selectivity coordination
Very powerful CPU (2 microprocessors)
Graphical Display (128x64 dot)
4 Leds for : Power/IRF, Trip/Alarm/TCF
IP44 protection case (on request IP54)
Totally draw-out execution
Autoranging multivoltage power supply
Complete autodiagnostic program