Siemens Reyrolle 7SR157 – Argus: Check Synchronising Relay

Overview

The Siemens Reyrolle 7SR157 Argus is a combined check and system synchronising relay. It is designed to control the closing of a circuit breaker based on measurements of line and bus voltages. Synchronisation is crucial when connecting two parts of a power system network that contain generation, to prevent shock loading and potential damage to electrical plant. This is achieved by ensuring voltage, frequency, and phase angle differences between the two systems are within acceptable limits.

Synchronisation Limits Diagram Description

A circular diagram illustrates synchronisation parameters. It shows 'Check Sync Limits' and 'System Sync Limits' defined by phase angles relative to 0° and 180°. 'Nominal Voltage' is indicated, along with 'Live Volts' and 'Dead Volts' states. The diagram also depicts 'System Split' conditions.

Key Highlights

• Independent check, system synchronising, and close on zero settings.
• Adjustable slip frequency, phase angle, and voltage blocking.
• Differential voltage blocking.
• Split system detection.
• Configurable dead/live bus and dead/live line voltage settings (2 State and 3 State).
• Integrated manual close guard feature.
• Synchronising bypass logic to connect a dead line or bus to a live line or bus.

Key Functions

Monitoring

• Undervoltage Detector
• Differential Voltage Detector
• Voltage Levels (Live and Dead status)

Control

• System Split Detector
• Voltage Trim (Magnitude and Phase)
• Check Synchronising
• Check Synchronising Close Guard
• System Synchronising
• Close On Zero (COZ) Synchronising
• System Split Lockout
• Synchronising Bypass
• Close Circuit Supervision 74CCS
• VT Fail Supervision 60VT
• Demand

User Interface

• Programmable from fascia.
• User-definable logic via Quicklogic equations and graphical design tool.
• 4 Setting groups.
• 6 User alarms on LCD.
• 4 Line x 20 characters LCD Display.

Monitoring and Data Functions

• Measured values.
• 1000 Event records.
• 10 Fault records.
• 10 Disturbance waveform records.

Hardware

• 2 Voltage Inputs.
• 3 or 6 Binary Inputs.
• 5 or 8 Binary Outputs.
• 9 user-configurable tri-coloured LEDs.

Communications

• Front USB port for relay interrogation.
• System/service RS485 port on rear.
• IEC 60870-5-103.
• DNP 3.0.
• MODBUS RTU.
• IEC 61850.

Configuration Software & Resources

• Configuration software: Reydisp Evolution.
• Webinar series: Reyrolle essentials.
• Catalog: Reyrolle 7SR157 Argus.
• Online shop: Industry Mall.

Application Diagram Description

A block diagram depicts a typical application for the System Synchroniser. It shows two power systems, 'Network A' and 'Network B', interconnected via an 'MV network'. A 'Network Inter-tie System Synchroniser Application' is positioned between them, with 'Check Synchronising' generally applied in each network, and 'Parallelling device' shown for each. This illustrates how the synchroniser manages the connection between separate power networks.

Company Information

Siemens AG
Smart Infrastructure
Electrification & Automation
Mozartstrasse 31c,
91052 Erlangen, Germany

Siemens Industry Inc.
3617 Parkway Lane
Peachtree Corners, GA 30092
United States