RED650 - Line differential protection

The RED650 IED (Intelligent Electronic Device) is designed for protection and monitoring of overhead lines and cables. In addition, this IED is capable of handling transformer feeders, generator and transformer blocks. It provides differential and impedance protection, with overcurrent backup functionality.

The RED650 IEDs are delivered pre-configured, type tested and set with default parameters for fast and efficient commissioning. These IEDs are configured complete with functionality adapted for single breaker applications with single or three phase tripping. The RED650 features phase-segregated current differential protection with excellent sensitivity for high resistive faults and secure phase selection for up to three line terminals. Two- or three-winding power transformers can be included in the protected zone.

The impedance protection function supports both quadrilateral and mho impedance characteristics, selected on a per zone basis. This enables coordination with existing impedance protection schemes in any power network.

The impedance protection is further enhanced with load encroachment adaptation, which reduces the risk of mal-operation due to high load. This is especially useful in sub-transmission networks where high line load needs to be allowed while high resistive faults need to be detected and cleared. The unique load current compensation in the first zone prevents unwanted trips during resistive faults and high power transfer on the line.

Overcurrent functions provide the necessary back-up protection. Breaker failure protection allows high speed back-up tripping of surrounding breakers and re-tripping of the own breaker.

The 650 series IEDs (Intelligent Electronic Device) have a number of useful features, such as a significantly reduced number of parameter settings and extended IED HMI functionality, including 15 dynamic three-color indication LEDs per page, on up to three pages, and configurable push-button shortcuts for different actions.

In the 650 series IEDs, the most basic parameters are set before delivery from the factory. You only need to set the parameters specific to your application. This allows you to quickly take your IEDs into operation. The application manual includes setting examples to support your protection engineers.

Relion – Complete confidence

Line differential protection RED650 IEDs belong to the Relion protection and control product family. The Relion product family offers a wide range of products for the protection, control, measurement, and supervision of power systems. To ensure interoperable and future-proof solutions, Relion products have been designed to implement the core values of the IEC 61850 standard. With Hitachi Energy's leading-edge technology, global application knowledge, and experienced support network, you can be completely confident that your system performs reliably – in any situation.