Technical Specifications

FAQ

1. What is the ABB REC670 1MRK002814-AC used for?
The ABB REC670 1MRK002814-AC is a Relion 670 Series protection and control IED designed for electrical power systems. It can be used for transmission line protection, substation automation, bay control, monitoring and coordinated protection functions. Depending on the selected configuration, the device can combine line differential protection with other protection and control functions, allowing multiple protection requirements to be handled within one integrated IED.

2. What is the main purpose of line differential protection in the REC670?
Line differential protection compares the current information measured at different ends of a protected transmission line. Under normal load conditions or faults outside the protected zone, the current relationship remains within the expected operating range. When a fault occurs inside the protected zone, the differential current increases and the protection can issue a trip command. This provides fast and selective fault clearing and is particularly useful for high-voltage transmission and sub-transmission applications.

3. Does the REC670 support communication-assisted protection schemes?
Yes. The REC670 platform supports communication-assisted protection functions that can exchange protection information between line terminals. These functions can be used with schemes such as permissive transfer trip, blocking and other teleprotection arrangements, depending on the selected configuration. Communication-assisted protection can significantly reduce fault-clearing time while maintaining selectivity for transmission-line faults.

4. What communication protocols can be used with the REC670?
The REC670 platform supports several station and protection communication technologies depending on the hardware and configuration. IEC 61850 is commonly used for substation communication, including MMS and GOOSE functions, while IEC 60870-5-103/104, DNP3 and other interfaces may be available for specific applications. The exact communication options should be confirmed from the complete ordering configuration before engineering or replacement.

5. Can the REC670 perform functions other than line differential protection?
Yes. The REC670 is a multifunction protection and control platform rather than a single-purpose differential relay. Depending on its configuration, it can provide overcurrent and earth-fault protection, voltage and frequency protection, distance-related functions, breaker failure protection, automatic reclosing, synchronism checking, disturbance recording and bay control. The functions available in a specific unit depend on its hardware, software and ordered application configuration.

6. How is the REC670 configured and engineered?
ABB PCM600 is used for engineering and configuration of compatible Relion 670 Series IEDs. Engineers can use PCM600 to manage IED settings, application configuration, communication parameters, signal mapping and other engineering functions. After configuration, the relay should be tested to verify protection elements, control logic, communication signals and interlocking functions before being placed into normal service.

7. What should be checked when commissioning the REC670 line differential protection?
Commissioning should include verification of CT and VT ratios, polarity, phase sequence, protection settings, differential protection parameters and communication channels between the relevant line terminals. Engineers should also test trip outputs, breaker control, interlocking, teleprotection signals and disturbance recording. For IEC 61850 installations, GOOSE or process-bus signals should be verified end-to-end rather than checked only at the local IED.

8. What are common causes of line differential protection problems on the REC670?
Common causes include incorrect CT polarity or ratio settings, communication-channel problems, incorrect differential protection configuration, synchronization issues and errors in the application logic. Communication-assisted protection can also be affected by incorrect channel configuration or loss of the remote terminal signal. When troubleshooting, it is important to check the relay event records and disturbance records together with CT measurements, communication status and protection settings to determine whether the problem originates from the measurement system, communication path or protection configuration.