FDPro 401
OVERCURRENT RELAY
FDPro 401 protection series are designed to electrical power distribution systems from overvcurrent faults to quickly isolate the grid and provide comprehensive and reliable protection.
Key Features
Protection Functions
FDPro 401 80 provides the following protective functions:
- .ANSI 37: Undercurrent (optional)
- .ANSI 46: Phase Balance
- .ANSI 49: Thermal Overload
- .ANSI 50BF: Breaker Failure
- .ANSI 50G & 51G: Ground Overcurrent
- .ANSI 50P & 51P: Phase Overcurrent
- .ANSI 64REF: Restricted Earthing (optional)
- .ANSI 68: Blocking Relay
- .ANSI 74CT: CT Trouble
- .ANSI 79: Autoreclosing
- .ANSI 86: Lockout Relay
- .CLP: Cold Load Pickup
- .TCM: Trip Circuit Monitoring
Hardware
- 7 Digital Inputs + 6 Digital Outputs + 7 LEDs
- Universal 20-130 V PSU
- Ethernet RJ45 and RS485 Serial Ports
- Configurable 1/5 A Nominal Current
Communication
- Modbus RTU RS485 / IEC 60870-5-103 / DNP3 protocol
- Modbus TCP/IP protocol
- IEC 61850 (optional)
Technical Questions
An overcurrent relay is a protective device used in electrical systems to detect and respond to excessive currents. It's designed to trip or open a circuit when the current flowing through it exceeds a predetermined level, safeguarding the system from damage caused by overloads or short circuits.
Overcurrent relays find applications in power systems, safeguarding against overloads and short circuits in transformers, generators, and transmission lines. In industrial settings, they protect machinery like motors and pumps by detecting and halting excessive currents that could cause damage.
The relay's current rating should be considered to ensure alignment with the maximum expected current in the circuit for accurate tripping during faults. Evaluation of the time-current characteristics is necessary to ensure the relay trips within the required time for the level of fault or overload.
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