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NETWORK / 26 / JUNE 2016 Num eatem utem ipsusae que consequatiae vel ipiet aperionsequi num fugitibus, tem quisquatur? Quis ut fugit doluptaero min- imin nobis dene inum eligendit ipitatum etur rerchitibust derchit aut hitat unt pos- tius dolo ipiendunt abo. Ut ommoditam, occus quaspit laborep eligentur se incto es si cusam ium quat autamus. Ari ipsaper ferchil incia quaepudaero mint que pa volest occumqui atur? USE CASE SP ENERGY NETWORKS – SUB.NET MONITORING What is a sub.net monitor? A sub.net monitor is a substation- based multifunction disturbance recorder that is connected to voltage and current transformers, and to auxiliary contacts from protection relays and switchgear. It can assess various elements of power system performance, process that information at site and send event reports to individual users by email. It can do this in about three minutes. S P Energy Networks (SPEN) is installing sub.net monitors across its network of primary substations in lower Scotland and North Wales to reduce outage times and asset risk across its network. The rollout represents a multimillion-pound investment for the DNO, but early indications show that financial, operational and service returns will be sub- stantial. The monitors, which were supplied by Irish technology company eMS, record and analyse fault events and link these to the network map. They enable early indication of 11kV fault locations, confirm that overhead line protec- tion or automation schemes are functioning properly and can de- termine if circuit breaker operating times are within acceptable limits. They can also help address power quality phenomena, according to SP Energy Network's IFI annual report for 2008/09 when the DNO assessed the technology trials. SP Energy Networks identi- fied three "sticky" breakers on its network during sub.net trials and by intervening before these break- ers were called on in the event of an actual fault, the DNO estimates that it has saved £500,000. Another key benefit was the identification of transient faults using imped- ance maps. SPEN's sub.net monitor rollout began in late 2015 and is continuing The effectiveness of the technology was proven in a £130,000 collaborative Innovation Funding Incentive (IFI) project Slow or sticky circuit breakers tend to increase interruptions to customer supply because a slow breaker will let a network fault escalate Over the course of the IFI project, the technology is thought to have progressed from a technology readiness level of six to eight