lv network monitoring demonstrating the possibilities
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25 October 2012 Gideon Evans. LV Network Monitoring Demonstrating the Possibilities. Introduction. SSE’s Low Carbon homes Can LV Network Monitoring equipment be retrofitted without taking customers off supply?. Capacity. Average Demand. Demand. XX:00. XX:30. - PowerPoint PPT PresentationTRANSCRIPT
25 October 2012Gideon Evans
LV Network MonitoringDemonstrating thePossibilities
Introduction
• SSE’s Low Carbon homes
• Can LV Network Monitoring equipment be retrofitted without taking customers off supply?
Understanding the LV Network
• Capacity– Current– MDI Information– Demand and Generation– more informed decisions
• Performance– Voltage Limits– Power Factor– Power Quality / Harmonics– more informed decisions
Time
Capacity
Average Demand
XX:00 XX:30
Demand
Monitoring Equipment
MDIs
Measuring Current
Measuring Voltage
Transmission of data
Installing Equipment
Storage of data
Calculated data
Rezap
Fault management
Measuring Current
• Conventional CTs– Installation would require
disruptive substation works– Known choice
• Rogowski Sensors– Can be installed around
existing cable cores– Accuracy considerations
• Innovations– Sentec GRIDKEY current
transducer– Now on the market
Measuring Voltage
• Terminal Block Connection– Possible on modern fuse cabinets
(eg Lucy Trifca)– Constrained cable routing– Need to drill holes in enclosures?
• Direct Busbar connection– Requires work on live busbars– Connection leads need to be
routed away from operational area
• Innovations– Drummond G clamp– Now on the market
Data Aggregation
• Manufacturers offered integrated solutions– Current Group offered Open Grid product– GE offered a C650 Relay / RTU, designed to work with ENMAC– Selex Galileo offered their Sentec Gridkey product
• Early versions had limited functionality – They had difficulties with measurement of directional current and harmonics
• Communications– Aerial extensions were required
• Data Storage in the data aggregator– Issues with capacity and reliability
• Cabinets– Issues with size, weight, IP rating and mounting
Equipment Connection
Current Group Current Group Open Grid Open Grid
Harmonics
Real and Reactive Power
Chalvey Local s/s
Selex Galileo / Sentec - GridKey
Communications
• Modes of Operation– Streamed (Real Time measured data)– Half Hour (Calculated data)– Alarms (Un-solicited data)
• Protocol - DNP3– For use with existing SCADA based control systems– Standardised template was needed
• Storage– Pi Historian
Further investigation
• Streamline installation process? (Thames Valley Vision Project)
• Equipment life-cycle – what should we expect from manufacturers? (Thames Valley Vision Project)
• Total monitoring system accuracy?
• Monitoring systems’ own energy usage?
Key Learning Points
• Live retrofitting can be done
• Today’s equipment can monitor complex electrical parameters
• LV network is as unbalanced as we thought!
• Monitoring is a system. Comms and data storage are key features, not bolt on extras
• Manufacturers value access to DNO networks – help them to help you
Any questions?
Thank you