Synaptec’s Refase™ system identifies faulted sections at low cost for operators.

Wide-area protection causes operators many problems, with existing solutions proving costly. Our Refase™ systems can quickly and easily identify faulted sections over long distances, and is completely passive, reducing operating costs.

Get in touch

Saul Matthews

Saul Matthews

Head of Commerical Development

Nitin Mahajan

Nitin Mahajan

Business Development – Power Grids (India, GCC & SE Asia)

Challenges in wide-area protection

The instrumentation and protection of new grid connections, for example to renewable generation or data centre projects, can be challenging to deliver economically.

Distance protection schemes, often favoured from the perspective of cost and simplicity, cannot determine the faulted branch and present issues relating to over- or under-reach. The more robust alternative, line differential protection, introduces its own challenges, including:

  1. A requirement for dedicated telecommunications infrastructure
  2. Accurate time synchronisation required at all remote points
  3. A lack of space in older, more remote substations in the area where renewables often connect

Our solution

Our Refase™ systems can instrument and reliably identify any number of faulted sections in these complex circuits over longer distances. This improves on the limitations of distance protection while avoiding the traditional capital cost of line differential protection.

By eliminating the need for new power supplies, copper wiring, dedicated telecommunications networks, or local GPS time sources, Refase™ radically reduces the capital cost of instrumentation for differential line protection in complex circuits with multiple branches.

Download our SSEN case study

Read our data privacy policy here. By registering above, you are opting in to our newsletter and communications.


Mixed circuit protection

OHL sag, ampacity and Dynamic Line Rating (DLR)

Wide area multi-ended differential protection

Digital substations

Cable condition monitoring

Wide area monitoring

Related posts



The Interrogator is the core component in all Synaptec installations, responsible for performing centralised, light-speed interrogation of every sensor in the array. It fully supports any mix of Synaptec’s electrical and mechanical sensors and performs real-time...

read more
Secondary Connected Module (SCM)

Secondary Connected Module (SCM)

Synaptec’s SCM enables the incorporation of conventional CT or VT secondaries into a passive photonic sensing system to reduce cost and equipment footprint while enhancing visibility and control of complex MV-HV power systems. [button...

read more


Refase™ is Synaptec’s powerful multi-zone power system protection solution, designed to protect complex, wide-area, or distributed networks and assets. The unique ability of Refase™ to simultaneously access many current measurements over a wide...

read more

Sectors we support

Power grids