ABB SPAU 140C Numerical Synchronization Check Relay

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1. Product Overview

ABB SPAU 140C Numerical Synchronization Check Relay is a proven digital protection relay designed to verify synchronization conditions before closing a circuit breaker between two power systems.
It measures voltage magnitude, phase angle difference, and frequency difference, ensuring that closing is permitted only when predefined synchronization criteria are met, thus protecting equipment and maintaining system stability.

2. Technical Specifications

• Model: SPAU 140C

• Product Name: Numerical Synchronization Check Relay

• Manufacturer: ABB

• Relay Type: Digital synchro-check relay

• Main Functions:

  • Synchro-check

  • Voltage-check

• Measured Quantities:

  • Voltage difference

  • Phase angle difference

  • Frequency difference

• Operation Stages:

  • Two independent synchro-check stages

• Rated Measuring Voltage: 100 V / 110 V AC

• Frequency Range: 45 to 65 Hz

• Auxiliary Power Supply:

  • 18 to 80 V DC or

  • 80 to 265 V AC / DC (depending on power module)

• Power Consumption: Low power consumption

• Output Contacts:

  • Rated voltage: 250 V AC / DC

  • Continuous current: 5 A

  • High short-time making capacity

• Display and Operation:

  • Digital display for measured values and settings

  • Front-panel keypad for parameter setting

• Communication Interface:

  • SPA serial communication bus

• Mounting Method:

  • Flush-mounted or control cabinet installation

• Operating Environment:

  • Suitable for industrial and power system applications

• Self-Supervision:

  • Continuous hardware and software self-monitoring

3. Advantages and Features

1. High Accuracy Synchronization Evaluation

   • Digital measurement ensures precise synchronization checking

2. Dual Independent Operation Stages

   • Suitable for multiple breaker or bus-tie applications

3. High Reliability and Safety

   • Built-in self-supervision enhances operational security

4. User-Friendly Operation and Maintenance

   • Clear digital display simplifies commissioning and service

5. Proven ABB Protection Technology

   • Designed for long-term, continuous operation

4. Typical Applications

• Generator synchronization to the power grid

• Busbar coupling and transfer schemes

• Automatic breaker closing supervision

• Industrial power distribution systems

• Power plants, substations, and large industrial facilities

5. Installation and Maintenance Notes

1. Verify System Ratings Before Installation

2. Correct Wiring and Phase Sequence

3. Do Not Install or Remove Under Power

4. Environmental Conditions Must Be Observed

5. Periodic Testing and Parameter Verification Recommended

The structure and details of the product：

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