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REL650 - Line distance protection

Your best choice for cost-efficient line protection applications

REL650 offers an optimum, ‘off-the-shelf’, ready-made application solution for the protection of single breaker connected power lines and cables. The type-tested variant is delivered equipped and configured with complete protection functionality, and with default parameters for easy handling of the product – from ordering, engineering, and commissioning to reliable operation.

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 distance protection REL650 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.

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REL650 provides protection of power lines and cables with high sensitivity and low CT requirements. Measurements and setting of all six zones with several setting groups are realized completely independently from each other to ensure high flexibility. The distance protection function supports both quadrilateral and mho impedance characteristics, selected on a per zone basis. This enables coordination with existing distance protection schemes in any power network.

The distance 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.

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