7SR120-Reyrolle

Reyrolle 7SR120

The 7SR12 includes directional control of the overcurrent and earth fault functionality and is typically installed where fault current can flow in either direction i.e. on interconnected systems. These relays are typically applied to provide the main protection on feeders and interconnectors and the back-up protection on items of plant such as transformers. On distribution system circuits overcurrent and earth fault protection are often the only protection installed.

The relay functionality allows highly flexible settings for current and time grading making it compatible with all types of overcurrent protection.

The relays are available in single and four pole variants housed in E4 cases with the IEC61850 protocol option housed in an E6 case. 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 or rear electrical RS485 port for remote connection is provided.

Cold load settings

Four settings groups

Password protection - 2 levels

User programmable logic

Self-monitoring

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)

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

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)