Siemens Reyrolle 7SR157 Check Synchronising Protection Relay
The Siemens Reyrolle 7SR157 Argus is an advanced check and system synchronising relay that ensures controlled and safe circuit breaker closing based on line and bus voltage measurements. It prevents closing when voltage magnitude, phase angle, or slip frequency differences exceed set limits, ensuring network stability and protection during synchronization operations
Technical Specifications
Model: 7SR157 Argus
Type: Check and System Synchronising Relay
Function: Controlled circuit breaker closing through voltage measurement
Case: 4U, size E4
Communication: USB (front), RS485 (rear) – MODBUS RTU / IEC 60870-5-103
Input/Output: Fully integrated with data logging and fault reporting
Monitoring Functions:
Undervoltage Detector (25) • Differential Voltage Detector (25) • Voltage Level (live/dead status) (25) • Close Circuit Supervision (74) • VT Fail (60)
Control Functions:
Voltage Trim (magnitude/phase) (25) • System-Split Detector (25) • Check Synchronizing (25) • Synchronizing Close Guard (25) • System Synchronizing (25) • Close on Zero Synchronizing (25) • System-Split Lockout (25) • Synchronizing Bypass (25)
Features:
Prevents circuit breaker closure when voltage, phase angle, or slip frequency exceed limits
Enables automatic or manual closing when parameters are within range
Provides full instrumentation, data logging, and fault reporting
USB and RS485 communication for local and remote access
Ideal for industrial, substation, and grid synchronization applications
Type: Check and System Synchronising Relay
Function: Controlled circuit breaker closing through voltage measurement
Case: 4U, size E4
Communication: USB (front), RS485 (rear) – MODBUS RTU / IEC 60870-5-103
Input/Output: Fully integrated with data logging and fault reporting
Monitoring Functions:
Undervoltage Detector (25) • Differential Voltage Detector (25) • Voltage Level (live/dead status) (25) • Close Circuit Supervision (74) • VT Fail (60)
Control Functions:
Voltage Trim (magnitude/phase) (25) • System-Split Detector (25) • Check Synchronizing (25) • Synchronizing Close Guard (25) • System Synchronizing (25) • Close on Zero Synchronizing (25) • System-Split Lockout (25) • Synchronizing Bypass (25)
Features:
Prevents circuit breaker closure when voltage, phase angle, or slip frequency exceed limits
Enables automatic or manual closing when parameters are within range
Provides full instrumentation, data logging, and fault reporting
USB and RS485 communication for local and remote access
Ideal for industrial, substation, and grid synchronization applications
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