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11kV Ring Main Unit Remote Control and Automation Project
Customer Profile

• LPN operate and manage the UK's capital city electrical network.
- Around 2 Million customer connections
- LPN's distribution area covers some 665km2
- Mostly densely populated region covering sensitive sites.
• To meet and exceed the regulators requirements.
• Improve quality of supply
- Supply security.
- Customer Interruptions (CI's).
- Customer Minutes Lost (CML).
• Reduce overheads.
• Remote Control Introduced 1998
• In 2002 nearly 5000 Distribution Substations fitted with full remote control.


System Topology:
System Description:
  • Multi-user, Multi-site System
  • Multi-user, Multi-site System
  • Communications Redundancy
  • Integration with NMS
  • Automation Functions
  • Circa 0.5 Million Data Points
  • RTU Quantities (2 or 3 Switch GMU):
    - PMR RTUs 5000
    - PSTN RTUs 400
    - GSM RTUs 100


Typical Network Configuration:

Automation Example:


 

Benefits / Features:


  • Quicker / Easier Fault Location
  • Quicker Load Restoration
  • Quicker Line Repairs
  • Improved Customer Minutes Lost
  • Less / No Penalties
  • User Definable Automation
  • Same RTU Types throughout
  • Unsolicited Reporting
  • Transducerless AC Measurements
  • Analogue Data Archives
 
Actual Results
• Installation of over 5000 units.
• Most secure electricity supply in the UK.
• In the last 5 years, remote control alone has saved 20 Customer Minutes Lost per Annum.
• Automatic Switching logic introduced in 2001 - Most customers have interruptions of less than 3 minutes.
• 60% of customers affected by HV faults are restored within 30 minutes.
- Note: LPN has 13,000 distribution substations around 5300 are automated.

R.C. Network Performance

Future
• L.E's Options:
-Increase number of Zones.
-Second stage restoration by using intermediate remotes.
-Logic at normal open points
-Improve communications speed.
-Introduce dynamic network reconfiguration.

References
• Ofgem - 2001/02 Electricity Distribution Quality of Supply Report - June 2003.

• CIRED 2003 - A Case Study of Extensive MV Automation in London.

 
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