Reyrolle 7SR220


7SR220 series relays include for directional control of the overcurrent and earth fault functionality and are typically installed where fault current can flow in either direction i.e. on interconnected systems. Relays have five current and four voltage inputs they are housed in E6 or E8 cases.

Integrated logic is provided to allow the optimal configuration of relay functionality with the relays analogue inputs and binary input/output circuits. The optional auto-reclose feature offers an integrated 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 protection.


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.


Cold load settings

Four settings groups

Password protection - 2 levels

User programmable logic


Circuit breaker trip counter and timer

Fault, event and waveform records

Protection functions

Undercurrent (37)

Broken conductor (46BC)

Negative phase sequence overcurrent (46NPS)

Thermal overload (49)

Overcurrent (50, 51)

Earth fault (50G, 50N, 50SEF, 51G, 51N, 51SEF)

Directional control of overcurrent & earth fault (67)

High impedance REF (64H)

Under/over voltage (27/59)

Negative phase sequence voltage (47)

Voltage controlled overcurrent (51V)

Neutral voltage displacement (59N)

Under/over frequency (81)

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

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