Fault Assistance Centre presentation
Fault Assistance Centre David Talbot & Chris Armstrong 24-25 September 2014 1 Agenda Introduction Fault overview Solution and case studies Questions and answers 2 Connecting the North West £8 billion of network assets 5 million 2.4 million 25 terawatt 3 Introduction Early location and repair of faults before they become permanent, avoids loss of customer supply The FAC enables early intervention to reduce the impact of cable faults on the LV underground network Together with latest techniques and equipment the FAC will prevent many faults from becoming permanent 4 Fault progression Transitory Irregular voltage dips Intermittent Irregular fuse operations Persistent Repetitive fuse operations Permanent Open circuit or welded short circuit Impact on customers 5 Probability of further fault activity Probability Insulation cooling Minutes Hours Moisture absorption Days Weeks 6 Frequency of faults 6 5 Time elapsed between faults 4 3 2 1 0 1 2 3 4 5 Number of Events 7 Faults showing distance from substation Fault A Fault C Fault D Fault B 8 What does it cost our business? Impact of transient faults on CIs and CMLs Greater than 3 events Greater than 5 events If 3rd and 4th trip can be reclosed within 3 minutes 35% of CIs and 31% of CMLs 19% of CIs and 16% of CMLs £700,000 saving £1.4 million lost revenue Improved customer satisfaction Incentive revenue 9 LV transient faults over a year 1800 1600 1400 1200 1000 800 600 400 200 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Transient Events 10 LV fault management - REZAP Can be installed on LV boards - indoor substations Controlled, reset and monitored remotely via Gateway Multiple-shot auto-recloser Single phase impedance based fault location 11 LV fault management – Modular REZAP Multiple-shot auto-recloser Can be installed in LV cabinets – outdoor substations Controlled, reset and monitored remotely via Gateway Single phase impedance based fault location 12 LV fault management – Bidoyng (smart) Single-shot auto-recloser Can be installed in most pillars and cabinets – outdoor substations Monitored via Gateway 3 phase impedance based fault location 13 WEEZAP World leading LV vacuum circuit breaker Advanced measurement and protection capability Safe LV interconnection, live monitoring and control Improves supply reliability and restoration through fault management and detection 14 TP22/23 fault location equipment Fault disturbance recorder with communications Multiple TDRs for transient faults Single TDR for permanent faults Travelling wave using two units 15 TP22/23 fault location equipment 16 Exploiting the potential of LV devices Devices are widely used to reduce CI and CML figures Further benefits can be obtained from the data they provide Analysis of data is a specialised subject area/training issue Only key ‘champions’ can perform this analysis Solution: Kelvatek’s Fault Assistance Centre (FAC) that will actively monitor the equipment installed on ENW’s LV network – trial under IFI 17 Business case Actively monitors equipment installed on LV network Faster fault location and repair Fault Assistance Centre business benefits Identification of 2nd and 3rd faults on the network Observation of fault ‘pecking’ Identifies circuits with overloading problems Identifies areas with poor health Helps us understand how best to use the LV kit 18 FAC process flow Transient identified Fault location from Kelvatek to Electricity NW Electricity NW fit REZAP/Bidoyng/ TP22/23 Confirm location Details sent to Kelvatec FAC Repair fault 19 Fault found - Radcliffe Details sent to Kelvatek FAC Fault location returned of 146 metres Next rupture confirmed with sniffer (two metres out) Fault repaired in four days of fitting REZAP 20 Fault found – Radcliffe 21 Fault found - Radcliffe 22 Fault found - Radcliffe 23 Melting Bidoyngs 24 Melting Bidoyngs – winter 2013/14 Red phase fuse blowing in outdoor cabinet Bidoyngs fitted on all three phases Received 2000 primary fuse ruptured / fuse replaced messages Visited site, found Bidoyng had ‘melted’ Conclusion Load related transient – 550 Amps 25 New Street – first fault 26 New Street – first fault 27 New Street – second fault 28 New Street – second fault 29 Multiple faults Overlaid first fault Second fault developed several months later Second fault never taken fuses Will this fault ever develop into a transient ? How does a DNO deal with these faults ? Targeted asset management ! 30 Summary • LV transient faults difficult to find • Faults progress to permanent state needing lengthy repair time • Faster fault location and repair • Identifies circuits with overloading problems • Improves customer service • Saves money • Expensive and time consuming to repair permanent faults • Impact on customer satisfaction Challenge Benefit Impact Solution • FAC exploits potential of existing LV fault devices • Actively monitors the equipment installed • Data supplied to determine fault location 31 QUESTIONS ANSWERS & 32 Want to know more? e [email protected] www.enwl.co.uk/thefuture 0800 195 4141 @ElecNW_News linkedin.com/company/electricity-north-west facebook.com/ElectricityNorthWest youtube.com/ElectricityNorthWest Thank you for your time and attention 33
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