Introduction
The ABB REG670 (1MRK002826-AA) Generator Protection Relay is a high-performance intelligent electronic device (IED) designed for comprehensive protection, control, and monitoring of synchronous generators in power generation systems. As part of ABB’s Relion® 670 series, it delivers advanced digital protection functions that ensure generator stability, system reliability, and fast fault isolation in critical energy environments.
This relay is engineered for modern power plants where generator safety, grid compliance, and continuous operation are non-negotiable. It combines high-speed protection algorithms with flexible configuration capabilities, making it suitable for both utility-scale and industrial generation systems.
Technical Specifications
| Parameter | Details |
|---|
| Model | REG670 |
| Order Code | 1MRK002826-AA |
| Manufacturer | ABB (Hitachi Energy) |
| Product Type | Generator Protection Relay (IED) |
| Series | Relion® 670 Series |
| Protection Functions | Differential, overcurrent, overvoltage, earth fault, loss of excitation |
| Application Scope | Generator protection in power plants |
| Voltage Rating | Up to medium/high voltage generator systems |
| Frequency Range | 47.5 – 63 Hz |
| Communication | IEC 61850, SCADA integration protocols |
| Data Functions | Event recording, disturbance monitoring |
| Diagnostics | Built-in self-testing and supervision |
| Operating Temperature | -20°C to +70°C |
| Humidity | Up to 95% non-condensing |
| Mounting | 19-inch rack / control panel installation |
| Weight | ~2–4 kg (variant dependent) |
Applications
The ABB REG670 is widely used in power generation and industrial energy systems, including:
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Thermal power plants
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Hydropower stations
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Gas turbine generator systems
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Industrial captive power plants
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Renewable energy generation plants
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Grid-connected synchronous generators
It is especially critical in systems where generator faults must be isolated instantly to prevent damage to expensive rotating machinery and to maintain grid stability.
Advantages
The REG670 delivers comprehensive generator protection in a single integrated platform, reducing the need for multiple standalone protection devices. Its modular design allows flexible configuration based on generator size, grid requirements, and protection philosophy.
A key strength is its ultra-fast fault detection capability, particularly for generator differential protection, ensuring rapid isolation of internal faults to prevent catastrophic damage.
Its advanced earth fault protection system, including 100% stator protection techniques, enhances safety even under low-current fault conditions that are traditionally difficult to detect.
The relay also supports IEC 61850 communication and full SCADA integration, enabling seamless digital substation connectivity, real-time monitoring, and remote control.
Additionally, built-in disturbance recording and self-diagnostic functions provide valuable operational insights, improving maintenance planning and reducing unplanned downtime.
Technical FAQs
1. What is the main function of the REG670 relay?
It provides full protection and control for synchronous generators in power systems.
2. What types of faults does it detect?
It detects differential faults, earth faults, overcurrent, overvoltage, and loss of excitation.
3. Is it suitable for power plants?
Yes, it is specifically designed for generator protection in power generation plants.
4. What communication protocol does it support?
It supports IEC 61850 and SCADA-compatible industrial communication systems.
5. Does it support disturbance recording?
Yes, it records fault events and system disturbances for analysis.
6. What is its operating temperature range?
Typically from -20°C to +70°C depending on configuration.
7. Can it protect large generators?
Yes, it is designed for medium to large synchronous generators.
8. Does it include self-diagnostics?
Yes, it continuously monitors internal health and functionality.
9. What industries use this relay?
Power generation, utilities, and large industrial energy systems.
10. What is its key advantage?
Fast, selective, and comprehensive protection of generator assets in critical power systems.
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