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ABB SPAU140C Numerical Synchro-Check Relay

ABB SPAU140C is a numerical synchronization and voltage-check relay designed for medium- and low-voltage power systems. The relay continuously monitors voltage magnitude, frequency, and phase angle differences between two electrical networks or bus sections.

The SPAU140C permits circuit breaker closing only when synchronization parameters are within predefined limits, minimizing the risk of electrical disturbances and equipment damage. Its dual-stage design supports both synchro-check and voltage-check functions, making it suitable for generator synchronization, busbar coupling, and utility interconnection applications.

The relay incorporates self-supervision diagnostics, event recording, and communication capabilities for integration into modern substation automation systems. It is widely used in power plants, substations, industrial facilities, and renewable energy installations. :contentReference

Reliable Synchronization Control

• Ensures safe synchronization of two power systems before breaker closing.

• Prevents damage caused by phase angle, frequency, or voltage mismatches.

Dual Functional Design

• Synchro-check and voltage-check functions integrated into one device.

• Two independent operating stages for flexible applications.

Enhanced System Protection

• Minimizes risk of network disturbances and equipment failures.

• Improves power system stability and operational reliability.

Advanced Diagnostics

• Continuous hardware and software self-monitoring.

• Rapid fault identification and reduced maintenance time.

Easy System Integration

• Compatible with ABB SPACOM systems.

• Supports communication through SPA bus interface for automation integration.

Proven ABB Reliability

• Designed for long-term operation in demanding industrial and utility environments.

ABB SPAU140C is commonly used in:

• Power Generation Plants

• Electrical Substations

• Utility Grid Interconnection Projects

• Busbar Coupling Systems

• Generator Synchronization Panels

• Industrial Power Distribution Networks

• Renewable Energy Facilities

• Hydroelectric Power Stations

• Wind Power Farms

• Critical Infrastructure Power Systems

Q1: What is the primary function of ABB SPAU140C?

A: SPAU140C is designed to verify synchronization conditions between two power systems before permitting circuit breaker closure.

Q2: Does the relay perform voltage checking?

A: Yes. The device supports both synchro-check and voltage-check functions for enhanced system protection.

Q3: What communication interface does SPAU140C support?

A: The relay supports ABB SPA Bus communication for integration with automation and monitoring systems.

Q4: Can SPAU140C be used for generator synchronization?

A: Yes. It is widely applied in generator synchronization systems, power plants, and grid connection projects.

Q5: Does the relay include self-diagnostic functions?

A: Yes. Continuous self-supervision monitors both hardware and software conditions to ensure reliable operation.

Q6: Is ABB SPAU140C still used in existing installations?

A: Although it is an older SPACOM-series relay, SPAU140C remains widely deployed in substations and industrial power systems where synchronization protection is required. 

Do you provide global shipping services?

Yes. We have local distribution centers on all continents, which can quickly transport parts to any corner of the world.

2. What payment methods and currencies do you accept?

To make your purchasing process as simple as possible, we offer multiple payment methods including bank transfer, check, and PayPal. Meanwhile, we also accept most mainstream credit and debit cards, such as Visa, Mastercard, and American Express. We can accept payments in most major currencies worldwide, but we recommend using US dollars (USD), British pounds (GBP), or euros (EUR) as a priority. Payments in other currencies may incur additional fees. All transactions are securely processed by HSBC Bank and HSBC Merchant Services.

How many parts do you currently have in stock?

We have a vast inventory of thousands of new, refurbished, and outdated automation components, including products from well-known manufacturers such as ABB and Schneider. If you cannot find the required parts, please do not worry. We work closely with a global network of professional suppliers to provide you with tailored quotes even if the part is not listed on our website.

Who can I contact if I encounter any problems?

Our experienced customer service team will handle any issues after you place your order.