Synaptec Cable Fault Detection For Mixed Lines / Hybrid Circuits

Published 05 Aug 2020

Cable Fault Detection

Cable Fault Detection

  • Thanks to Gordon Lindsay Account Director Transmission at Synaptec

The Synaptec Cable Fault Detection solution delivers high availability, not affected by temperature fluctuations, cost-effective and proven technology.

Cable fault detection in a cable or overhead powerline is challenging & expensive. Synaptec Refase™ provides time-synchronized current measurements from any transition point. Works where there is no access or power (under cities, remote or deserts). Enables auto-reclose on overhead faults while blocking auto-reclose for cable section faults.

  • High availability
  • Not affected by temperature fluctuations
  • Cost-effective
  • Proven solution

In hybrid circuits containing both overhead lines and underground cable sections, it is advantageous to determine in which section an electrical fault has occurred. This enables an operator to auto-reclose (AR) in the event of a transient OHL fault, or to block auto-reclose in the event of a permanent cable fault.

This is not typically possible if simple distance protection schemes are deployed, which will typically result in some ambiguity in identification of the faulted section, rendering auto-reclose prohibitively risky.

Ideally, the circuit would be instrumented at every transition point such that robust differential current algorithms may be used to immediately and definitively identify the faulted section in the event of a fault, and so permit or block auto-reclose accordingly.

Cable Fault Detection

Cable Fault Detection

However, to deploy conventional current measurements at remote transition points is typically very expensive, requiring significant local supporting infrastructure including power supplies, active digital telecoms, and GPS access to obtain reliable measurements. Optical NCITs have fundamental limits on range and environmental withstand and consume multiple fibres per instrumented location, fundamentally limiting their deployment at scale.

A single Refase™ system is uniquely capable of instrumenting multiple hybrid circuit sections with passive, highly-multiplexable current sensors over unprecedented range.

This system enables discrete, robust, and scalable differential current monitoring over long-range, with measurements maintaining consistent high accuracy over wide operating temperature ranges when compared to these prior technologies.

Discrete AR block signals are output on protection timescales (milliseconds), allowing an operator to cost-effectively manage hybrid circuits in the most efficient manner possible.

About SynaptecSynaptec

Synaptec radically enhances power system protection, monitoring and asset management using innovative light-speed technology easily deployed on existing infrastructure. The leader in secure, scalable and data-rich, multiparameter, power instrumentation.

Providing immediate and long term analysis of asset health and operational performance. Implement best practices over wide areas and throughout complex networks.

Experts In Equipment for Explosive Atmospheres with ATEX & IECEx Certification

Specialist Suppliers of High Voltage Electrical Equipment & Cable Accessories

Jointing, Earthing, Substation Electrical & Safety Equipment Distributors

Thorne & Derrick International are specialist distributors of LV, MV & HV Cable Installation, Jointing, Duct Sealing, Substation & Electrical Equipment – servicing UK and global businesses involved in cable installations, cable jointing, substation, overhead line and electrical construction at LV, 11kV, 33kV and EHV.

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