Presentation on theme: "Prototype Development of Automated Ring Main Unit System TNB Distribution Presentation Meeting."— Presentation transcript:
Prototype Development of Automated Ring Main Unit System TNB Distribution Presentation Meeting
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: 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?
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.
Customer Requirements ??
Deliverables A prototype RMU Motorization Unit for operation of manually operated F&G* Ring Main Units.
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.
Project Methodology Stages of prototype development: 1.Torque and dimension measurements 2.Study of Actuation Mechanism 3.Grip frame design and material selection 4.Sensors & Alignment 5.Power & Controls 6.Testing & Trials
RMU Automation Operational Block Diagram M1 M2 M3 Manual push relays & Indicators Microcontroller Motor Driver w max current limit 28VDC 10A SCADA Auto/Remote Local/Manual CW Local/Manual CCW Load switch limit switch Power Supply Unit CW/CCW control signal
Components List 1.Power supply unit 2.Grip Frame 3.Motor Mounting Rails Assembly 4.Programmable Logic Controller 5.Motor Driver/controller 6.Auto/Manual Cam Selector Switch 7.Push Power Relays 8.Limit/position Sensors 9.Geared DC Motors 10.Miscellaneous
Features 1.Light-weight (require only one person for mounting & installation) 2.Simple gripping and holding mechanism 3.Ready for remote and local operation 4.Completely detachable motor unit for manual operation 5.Continuous Breaker load switch status indicator 6.Motor over-current protection 7.Response time of < 5 seconds 8.Motor interlock operation
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
Initial survey and testing in ILSAS Initial motor selection Load breaker switch sizing
Motor mount and torque testing Continuation of motor selection
DC Motor on mount Testing torque capability
A closer look at the Motor Mounting Rail Assembly
Further testing on actual F&G RMU
Procurement of Test Bed RMU
Installation of Mount on Grip Frame
Motor mount installed on grip frame on an F&G RMU
Rear view of gripping clamp
F&G ZZTT and ZZT RMUs in UNITEN ZZT F&G RMUZZTT F&G RMU
Detachable Motor Mounting Rail Assembly
Motor Selection and Testing – ILSAS 30VDC Circuit Breaker Motor
Gearbox Failure – Specified Torque 25N-m
Switching Key Failure
Testing on RMUs in UNITEN
Play Video Motor Mounting Rail Assembly
Play Video Motor Mounting Rail Assembly
Thank you. Questions & Discussions
Timeline Month 1Month 2Month 3Month 4 Actuation Mechanism Assy Fabrication and assy Test and Trials Cross Slide Traversing Assy Design and Procurement Fabrication Actuation and Cross slide integration Test and Trials Sensors & Alignment SelectionProcurementIntegrationTest and Trials Power & Controls System Selection and Procurement ProgrammingTest and Trials Networking and Communication PDSB
Uniten Procurement Procedures Requestor 1. Fill PR Form 2. Prepare Tech. Spec. Officer-in-Charge approves requirements Finance verifies availability of budget Approval of PR Approving Authority (PR) : ≤ RM 5K - Dean ≤ RM 100 K - TNC > RM 100 K - NC Call for Quotation / Tender Evaluation with Endorsement by Dean / HOS Approval / Award ≤ RM 1 K - Dean ≤ RM 5 K - College Tender Committee ≤ RM 10 K - NC ≤ RM 500 K - TNC(P) Tender Committee Create PO ≤ RM 5 K : Procurement Manager ≤ RM 100 K : TNC(P) > RM 100 K : NC Supplier delivers product / provide service Quotation Value: ≤ RM 100 K Float period: days Min. : 3 companies Tender Value: > RM 100 K Float period: days Min. : 5 companies