7SR224 Overcurrent Protection Relay
7SR224 series relays include for directional control of three phase overcurrent and earth fault functionality and typically installed as an integral controller for a pole mounted recloser. The controller offers an integrated auto-reclose solution for use on OHL feeders.The relay functionality allows highly flexible settings for current and time grading making it compatible with all types of overcurrent protections.Relays have four current and four voltage inputs and are housed in E10 cases.Integrated logic is provided to allow the optimal configuration of relay functionality with the relays analogue inputs and binary input/output circuits.Protection, instrumentation and metering functionality is accessible via data comms channel(s). A front USB port for local PC connection and rear electrical RS485 port for remote connection are provided as standard, additional ports are available as options.
Undercurrent (37)
Broken Conductor (46BC)
Negative Phase Sequence Overcurrent (46NPS)
Thermal Overload (49)
Overcurrent (50, 51)
Earth Fault (50G, 50SEF, 51G, 51SEF)
High Impedance REF (64H)
Under/Over Voltage (27/59)
Negative Phase Sequence Voltage (47)
Voltage Controlled Overcurrent (51V)
Neutral Voltage Displacement (59N)
Directional Control of Overcurrent & Earth Fault (67)
SUPERVISION FUNCTIONS
CT Supervision (60CTS)
Trip & Close Circuit Supervision (74T/CCS)
VT Supervision (60VTS)
Inrush Detector (81HBL2)
Circuit Breaker Fail (50BF)
CONTROL FUNCTIONS
Auto Reclose (79)
MONITORING FUNCTIONS
Primary/Secondary Current Phases and Earth Direction
Primary/Secondary Line and Phase Voltages
Apparent Power and Power Factor
Real and Reactive Power
W Hr & VAr Hr Forward and Reverse
Historical Demand Record
Positive Phase Sequence (PPS) Voltage & Current
Negative Phase Sequence (NPS) Voltage & Current
Zero Phase Sequence (ZPS) Voltage