Siemens 7SR210 Non-Directional Overcurrent Protection Relay

The 7SR210 series of relays provide overcurrent and earth fault protection. Siemens 7SR210 Overcurrent Relay is typically applied to provide the main protection on feeders and interconnectors and the backup protection on items of plant such as Transformers, Relays have four current inputs and are housed in E6 or E8 case.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 analog 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 protections.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.

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

The comprehensive range of Reyrolle products provides the total protection requirements of distribution markets and industrial applications – ranging from overcurrent protection via transformer protection and voltage control to a full spectrum of auxiliary and trip relays. The portfolio includes many famous products such as “Argus, “Duobias”, “Solkor”, “Rho, etc. Through successive generations, Reyrolle numerical products have been developed to increase value to system operators. Discover the portfolio!