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ABB SPAU 140C Synchro-Check and Voltage-Check Relay

The ABB SPAU 140C, also cataloged as the SPAU 140C Synchro-Check and Voltage-Check Relay, operates as a dedicated hardware component for synchronizing voltage conditions and supervising circuit breaker closing operations within ABB SPACOM protection and control systems.

Hardware Specifications

Parameter	Specification
Model	SPAU 140C
Brand	ABB
Product Type	Synchro-Check and Voltage-Check Relay
Series	SPACOM Protection Relay Series
Dimensions	Subrack / flush mounting case module configuration
Operating Temp	-10 deg C to +55 deg C
Storage Temp	-40 deg C to +70 deg C
Rated Voltage	100 VAC, 110 VAC, 115 VAC, or 120 VAC configurable
Auxiliary Power Supply	80 to 265 VAC/DC or 18 to 80 VDC versions available
Voltage Difference Setting	0.1 to 0.8 x Un adjustable range
Upper Voltage Level Setting	0.5 to 1.0 x Un adjustable range
Output Relay Contact Rating	250 VAC/DC switching voltage, 5 A continuous current
Dielectric Test	2 kV, 50 Hz, 1 min
Impulse Test	5 kV, 1.2/50 us, 0.5 J
Insulation Resistance	Greater than 100 Mohm at 500 VDC

ABB Industrial Control Interface Characteristics

The SPAU 140C integrates microprocessor-based voltage supervision logic for AC network synchronization tasks. It evaluates phase angle difference, voltage deviation, and frequency slip conditions before enabling breaker closing commands.

Furthermore, the relay provides dual-stage synchro-check functions and voltage-check functions for live busbar and dead-line detection. The output relay contacts execute auxiliary switching actions after the configured synchronization conditions are satisfied.

The unit belongs to the ABB industrial protection platform family and supports serial communication integration for substation automation applications. Additionally, ABB relay engineering practices include backplane bus communication velocity management, Profinet / EtherNet-IP deterministic network concepts in related automation platforms, and firmware flash compatibility across supported control environments.

Frequently Asked Questions

Q: What electrical conditions does the SPAU 140C evaluate before breaker closing?
A: The SPAU 140C evaluates phase angle difference, voltage difference, and frequency slip between two AC networks before allowing a synchronization command.

Q: Does the SPAU 140C support both live-line and dead-line checking?
A: Yes. The relay includes voltage-check functions that supervise live or dead line and busbar conditions according to configured voltage thresholds.

Q: Can the SPAU 140C operate with different auxiliary supply ranges?
A: Yes. Available versions support auxiliary power supply ranges including 80 to 265 VAC/DC and 18 to 80 VDC.

Field Installation Guidelines

• Install the SPAU 140C in the specified subrack or flush mounting arrangement according to the mechanical installation requirements.
• Verify AC voltage transformer wiring before energizing the relay input circuits.
• Maintain separation between voltage measurement wiring and high-current power cables to reduce electrical interference.
• Connect communication wiring with appropriate shielding and grounding practices according to the substation control system requirements.
• Confirm auxiliary supply polarity for DC versions before applying power.
• Check configured voltage thresholds, phase difference limits, and synchronization parameters during commissioning.
• Perform insulation and functional tests after installation before placing the relay into service.

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