Current Voltage Power Feeder Protection Relay
SMPR
Current Voltage Power Feeder Protection Relay
The SMPR has been designed to measure the line and the ground RMS currents and supply RMS voltages under normal conditions or under disturbances.
This information is internally processed by the microprocessor, to take the protection actions defined by the user under ANSI, IAC or IEC standards. The operational conditions of the breaker or disconnector are also signaled.
Document PDF
On request: Ethernet comunication port (Modbus TCP/IP)
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
- Ethernet communication port (Modbus TCP/IP) - on request
Protection and Functionality
- 27) Undervoltage
- (32) Directional power
- (37) Undercurrent
- (46) Negative sequence current
- (47) Phase-sequence voltage
- (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
- (55) Power factor
- (59) Overvoltage
- (68) Blocking output
- (81) Underfrequency and Overfrequency
- (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
- RMS line or phase voltages
- Active power (kW), reactive power (kvar) and apparent power (kVA)
- Active energy (MWh) and reactive energy (Mvarh)
- Power factor and system frequency
- Positive and negative real power (kW) and reactive power (kvar)
- Demand and maximum demand: current in each phase (A), real power (kW), reactive power (kvar)
Accessories for the Feeder Protection Family
Current transformers
