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Prototype Development of Automated Ring Main Unit System

Prototype Development of Automated Ring Main Unit System. TNB Distribution Presentation Meeting. Project Background. RMUs Presently Used. What is an RMU? Who operates it? Are there safety concerns?. RMU Operation. Opening/closing of the load break switch or earthing switch :

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Prototype Development of Automated Ring Main Unit System

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  1. Prototype Development ofAutomated Ring Main Unit System TNB Distribution Presentation Meeting

  2. Project Background

  3. RMUs Presently Used • What is an RMU? • Who operates it? • Are there safety concerns?

  4. RMU Operation • Opening/closing of the load break switch or earthing switch: • Key/lever • Pushed to overcome spring force • Turn 90˚ at ~20 N.m (clockwise or counter-clockwise depending on usage) • Who operates it? • Are there safety concerns? • Can it function remotely?

  5. Project Objectives • To design a motorized retrofit for automatic operation of (F&G*) Ring Main Unit (RMU) as per technical specifications provided by TNB Distribution.

  6. Customer Requirements • ?? • ??

  7. Deliverables • A prototype RMU Motorization Unit for operation of manually operated F&G* Ring Main Units.

  8. Project Impact • The proposed system would be able to switch the RMU breakers in a safe manner via remote control. • Reduce downtime via remote operation and enhance the safety of TNB’s personnel by eliminating the need for manual operation of the RMU.

  9. Project Methodology Stages of prototype development: • Torque and dimension measurements • Study of Actuation Mechanism • Grip frame design and material selection • Sensors & Alignment • Power & Controls • Testing & Trials

  10. RMU Automation Operational Block Diagram Auto/Remote Manual push relays & Indicators Local/Manual CW Local/Manual CCW M1 Power Supply Unit Motor Driver w max current limit M2 28VDC 10A M3 CW/CCW control signal Load switch limit switch Microcontroller SCADA

  11. Components List • Power supply unit • Grip Frame • Motor Mounting Rails Assembly • Programmable Logic Controller • Motor Driver/controller • Auto/Manual Cam Selector Switch • Push Power Relays • Limit/position Sensors • Geared DC Motors • Miscellaneous

  12. Features • Light-weight (require only one person for mounting & installation) • Simple gripping and holding mechanism • Ready for remote and local operation • Completely detachable motor unit for manual operation • Continuous Breaker load switch status indicator • Motor over-current protection • Response time of < 5 seconds • Motor interlock operation

  13. Estimated Costing* per 2+1 RMU (3 motor set) • Mechanical works (motor mounting and grip frame) – ~ RM1300 • Geared motors – 3 x RM700 • Controller – RM400 • Motor driver – RM700 • Sensors and electronics components – RM400 • Power Supply Unit – RM900 (for prototype only) • TOTAL COST – ~RM5000 (without PSU) * For large quantities of order

  14. Initial survey and testing in ILSAS Load breaker switch sizing Initial motor selection

  15. Continuation of motor selection Motor mount and torque testing

  16. Testing torque capability DC Motor on mount

  17. A closer look at the Motor Mounting Rail Assembly

  18. Further testing on actual F&G RMU

  19. Procurement of Test Bed RMU

  20. Installation of Mount on Grip Frame

  21. Motor mount installed on grip frame on an F&G RMU

  22. Rear view of gripping clamp

  23. F&G ZZTT and ZZT RMUs in UNITEN ZZT F&G RMU ZZTT F&G RMU

  24. Grip Frame

  25. Detachable Motor Mounting Rail Assembly

  26. Motor Selection and Testing – ILSAS 30VDC Circuit Breaker Motor

  27. Gearbox Failure – Specified Torque 25N-m

  28. Switching Key Failure

  29. Testing on RMUs in UNITEN

  30. Motor Mounting Rail Assembly Play Video

  31. Motor Mounting Rail Assembly Play Video

  32. Thank you. Questions & Discussions

  33. Timeline

  34. Uniten Procurement Procedures Tender Value: > RM 100 K Float period: 14 - 21 days Min. : 5 companies Quotation Value: ≤ RM 100 K Float period: 3 - 14 days Min. : 3 companies

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