Refase™ is Synaptec’s powerful multi-zone protection instrumentation, designed to enable robust protection of complex, wide-area, or distributed networks and assets.

The unique ability of Refase™ to access many measurements over a wide geographical area, or traversing multiple feeder sections within a substation, enables convenient centralised protection and control functions. This includes multi-zone protection – with up to 10 protected sections per fiber – combined with intelligent and highly-selective auto-reclose (AR or DAR). This means that we can provide very granular unit protection of lines, cables, and other assets – including at very remote locations where it would be challenging and costly to install conventional monitoring equipment.

Each Refase™ system can issue time-critical trip and control commands, typically using GOOSE communications, and can interface with existing SCADA systems. Sample Value data streams can also be provided to existing substation equipment.

Multi-zone protection

Our unique multi-zone protection capability can be applied to feeders, hybrid circuits (composed of multiple underground cable and overhead line sections), busbars within substations, and individual sections of offshore wind farm export cables. This approach is also ideal for monitoring, protecting, and controlling distributed generation – particularly wind farms.


There are several technical, practical, and cost benefits arising from this integrated, centralised protection approach:

  • Auto-reclose of healthy sections, with highly granular selectivity, reduces outages and customer minutes lost (CML)
  • Minimised loss of income following faults – particularly for remote generators and offshore wind farms where maintenance is challenging
  • Avoids double exposure to fault currents caused by manual fault location
  • Highly cost-effective busbar protection
  • Faster-acting multi-ended differential protection, due to elimination of the typical wide-area communications delay of 2-6 ms, and elimination of other complications such as asymmetrical delay
  • Enables rapid and discrete post-event response – all measurements are accurately time synchronised which facilitates examining fault records for complex events
  • Readily supports new grid connections with minimal civil engineering works
  • Multiple uses from same instrumentation infrastructure

Proven technologies

Through our field deployments with Scottish Power Energy Networks and Statnett, our platform is proven to support modern digital substation protocols, including IEC 61850-9-2 Sampled Values, IEC 61850-8-1 GOOSE, and IEC 61850-9-3 (IEEE 1588 PTPv2). The hardware also supports the PRP redundancy protocol.

See our application notes on multi ended protection and cable fault detection for more information on the ground-breaking applications of Refase™.

More Information

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Introduction to our technology
Synchromerger™ – synchronous real-time measurements
Synthesis™ – instrumentation & analysis platform