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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.

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25 october 2012 gideon evans

25 October 2012

Gideon Evans

LV Network MonitoringDemonstrating thePossibilities


SSE’s Low Carbon homes

Can LV Network Monitoring equipment be retrofitted without taking customers off supply?

Understanding the lv network


Average Demand




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


Monitoring equipment
Monitoring Equipment

Measuring Voltage


Calculated data

Storage of data


Fault management

Transmission of data

Installing Equipment

Measuring Current

Measuring current
Measuring Current

Conventional CTs

Installation would require disruptive substation works

Known choice

Rogowski Sensors

Can be installed around existing cable cores

Accuracy considerations


Sentec GRIDKEY current transducer

Now on the market

Measuring voltage
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


Drummond G clamp

Now on the market

Data aggregation
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


Aerial extensions were required

Data Storage in the data aggregator

Issues with capacity and reliability


Issues with size, weight, IP rating and mounting

Current group open grid
Current Group Open Grid

Chalvey Local s/s


Real and Reactive Power


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


Pi Historian

Further investigation
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
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

Any questions?

Thank you