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Siemens Reyrolle 7SR157 Check Synchronising Protection Relay

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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

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