Prototype Development of Automated Ring Main Unit System TNB Distribution Presentation Meeting.
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Transcript of Prototype Development of Automated Ring Main Unit System TNB Distribution Presentation Meeting.
Prototype Development ofAutomated Ring Main Unit SystemTNB 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: 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 measurements2. Study of Actuation Mechanism3. Grip frame design and material selection4. Sensors & Alignment5. Power & Controls6. Testing & Trials
RMU Automation Operational Block Diagram
M1
M2
M3
Manual pushrelays & Indicators
Microcontroller
Motor Driver w max current
limit
28VDC 10A
SCADA
Auto/RemoteLocal/Manual
CWLocal/Manual
CCW
Load switch limit switch
Power Supply Unit
CW/CCWcontrol signal
Components List
1. Power supply unit2. Grip Frame3. Motor Mounting Rails Assembly4. Programmable Logic Controller5. Motor Driver/controller6. Auto/Manual Cam Selector Switch7. Push Power Relays8. Limit/position Sensors9. Geared DC Motors10.Miscellaneous
Features1. Light-weight (require only one person for
mounting & installation)2. Simple gripping and holding mechanism3. Ready for remote and local operation4. Completely detachable motor unit for manual
operation5. Continuous Breaker load switch status
indicator6. Motor over-current protection7. Response time of < 5 seconds8. 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 RMU ZZTT F&G RMU
Grip Frame
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
TimelineMonth 1 Month 2 Month 3 Month 4
Actuation Mechanism Assy
Fabrication and assy
Test and Trials
Cross Slide Traversing Assy
Design and Procurement
FabricationActuation and
Cross slide integration
Test and Trials
Sensors & Alignment
Selection Procurement Integration Test and Trials
Power & Controls System
Selection and Procurement
Programming Test and Trials
Networking and Communication
PDSB
Uniten Procurement Procedures
QuotationValue: ≤ RM 100 KFloat period: 3 - 14 daysMin. : 3 companies
TenderValue: > RM 100 KFloat period: 14 - 21 daysMin. : 5 companies