ABB | SPAU 140 C | Synchro-Check Relay | Protective Control Device

Product Description

The ABB SPAU 140 C Synchro-Check Relay is a protective device engineered to supervise voltage, frequency, and phase angle between two power sources before circuit breaker closing. By ensuring synchronization conditions are met, it prevents unsafe switching operations and supports reliable grid stability in utility and industrial power systems.

Technical Specifications:

• Manufacturer: ABB

• Model Number: SPAU 140 C

• Product Type: Synchro-Check Relay

• Rated Voltage Inputs: Suitable for typical secondary measurement ranges in medium- and high-voltage systems

• Frequency Range: Adjustable supervision for synchronization control

• Phase Angle Supervision: Configurable closing angle limits

• Voltage Difference Limits: Selectable thresholds for safe breaker operation

• Auxiliary Supply: Compatible with standard control voltages

• Output Contacts: Relay outputs for breaker control and interlocking functions

• Mounting: Panel-mounted protective relay housing

• Interface: Front-panel indicators and configuration switches

Key Features:

• Synchro-Check Function: Allows breaker closing only when voltage, frequency, and phase angle meet preset limits.

• Dead-Bus Detection: Enables closing when one side of the system is de-energized.

• Selectable Operating Modes: Adaptable to different system configurations.

• Fast Response: Provides rapid synchronization for breaker operation.

• High Reliability: Built on ABB’s proven protection relay platform.

• Clear Indications: LED signaling for operational status and supervision.

• Flexible Settings: Wide adjustment ranges for precise system matching.

Applications:

• Power generation plants requiring safe synchronization of circuit breakers

• Industrial facilities with multiple power sources

• Utility substations needing reliable synchro-check protection

FAQ:

• Q: What conditions must be met for breaker closing?  A: Voltage, frequency, and phase angle must be within preset limits.

• Q: Can the SPAU 140 C detect a dead bus?  A: Yes, it supports dead-bus detection for safe closing when one side is de-energized.

• Q: How is configuration performed?  A: Settings are adjusted via front-panel switches, with LED indicators for monitoring.

Comparison with Similar Models:

• SPAU 120 C: Basic synchro-check relay with limited adjustment ranges

• SPAU 140 C: Advanced supervision with configurable thresholds and dead-bus detection

• SPAU 160 C: Extended functionality with enhanced communication interfaces