ABB SPAU140C Voltage Measuring Relay

The ABB SPAU140C is a numerical synchronizing check relay designed for connecting two power systems. This microprocessor-based relay ensures safe and reliable paralleling operations with a variety of advanced features.

Key Features of SPAU140C

Voltage and Frequency Measurement

The SPAU140C measures the voltage and frequency on both sides of the connection. It ensures they are within acceptable limits before paralleling.

Phase Angle Measurement

The relay measures the phase angle between both sides of the connection. It ensures they are in synchronism before paralleling.

Slip Calculation

The SPAU140C calculates the slip between both sides of the connection. It ensures it is within acceptable limits before paralleling.

Dead Bus Detection

The relay detects a dead bus condition on either side of the connection. It prevents paralleling if this condition occurs.

Out-of-Synchronism Closing Prevention

The SPAU140C prevents out-of-synchronism closing by opening the circuit breaker. It does this if the phase angle between both sides exceeds a preset limit.

Under-Voltage Closing Prevention

The relay prevents under-voltage closing by opening the circuit breaker. It does this if the voltage on either side falls below a preset limit.

Fast Operating Times

The SPAU140C operates quickly, ensuring safe and reliable paralleling operations.

Variety of Communication Options

The relay offers various communication options, including RS485, Modbus RTU, and DNP3.

Technical Specifications of SPAU140C

• Voltage Range: 80 to 265 V AC or DC
• Frequency Range: 45 to 65 Hz
• Phase Angle Accuracy: ±0.5 degrees
• Slip Accuracy: ±0.1 Hz
• Operating Time: ≤20 ms
• Communication Protocols: RS485, Modbus RTU, DNP3

Applications of SPAU140C

• Paralleling of generators
• Interconnecting busbars
• Closing ring mains