Phase Current & Ground Directional Protection Relay

SMPR-2

Features

• CT primary ratio selectable in 5 A steps (5 to 6000 A)
• Touchpad programming
• 1 trip relay
• 3 auxiliary relays that can be associated to the various functions
• Power loss or internal fault control relay
• 3 programmable Digital inputs and 1 Digital input for breaker status
• Breaker operation failure alarm on trip command
  

Applications

• Primary and backup protection for utility feeder, power plants and industrial distribution systems
• Protection of transformers, overhead lines, cables and generators
  

Communication

• Communication port: (1) RS232 and (2) RS485
• Remote programming of the setpoints
• Communication Protocol: Modbus RTU
  

Protection and Functionality

• 49) Thermal Overload
  
• (50) Instantaneous phase overcurrent
• (50N/50G) Instantaneous ground overcurrent
• Overload alarm pickup level
• (51) Inverse time phase overcurrent
• (51N/51G) inverse time ground overcurrent
• ANSI, IAC or IEC/BS142 curves included:
• moderately inverse
• normal inverse
• very inverse
• extremely inverse
• definite time
• (67N) Neutral Directional Overcurrent
• (68) Blocking output
• (86) Lockout
• Accumulated KA per phase on breaker 
• interruption
  

Signalling

• LED and LCD display indication
• Last trip cause and relative data
• Indication and storage of fault condition and their values
• Indication of the breaker status (open, close, earthed)
• RMS line and ground currents