Siemens Reyrolle 7SR57 Motor Protection Relay
The Siemens Reyrolle 7SR57 Motor Protection Relay provides comprehensive motor protection for industrial and utility applications. Supporting 4/8xI current inputs and 0/4xV voltage inputs, it delivers precise protection against thermal overloads, phase faults, earth faults, stalling, and abnormal operating conditions.
Key Features & Benefits:
- Complete Motor Protection – Safeguards motors against short-circuit, overload, earth fault, and abnormal conditions.
- Enhanced Monitoring – Real-time measurement and fault logging improve system reliability.
- Flexible Application – Suitable for LV and MV motor protection in industrial and utility setups.
- User-Friendly Design – Easy integration with SCADA and automation systems for centralized monitoring.
- Operational Efficiency – Reduces unplanned downtime, improves energy efficiency, and extends motor life.
- Ideal for industries in Mumbai and India, including manufacturing plants, utilities, process industries, and heavy machinery operations.
Application
- Motor protection functions designed to protect during all motor starting and running sequences
- Thermal algorithm optimized to closely match the thermal characteristics of motors
- Thermal monitoring via plant temperature sensors supported
Standard functionality
- 14 Locked rotor protection
- 37/37G Undercurrent protection – phase/earth
- 46BC Broken conductor detection
- 46PR Phase-rotation reversal
- 46UB Phase unbalance
- 50BCL Break capacity limit
- 86 Lockout
Optional functionality – 7SR57
- 27/27Vx Undervoltage protection
- 32 Power protection
- 47 Sequence protection
- 55 Power factor
- 59/ 59Vx Overvoltage protection
- 81R Frequency protection – “df/dt“
Monitoring functions
- Primary, secondary and phase sequence current & voltage
- Frequency, power, and energy
- Fault data, event and records
- Motor start data log
Communication
- IEC 60870-5-103, MODBUS-RTU, DNP3, IEC 61850
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