10/08/20151 graybar point heating presentation graeme j ford eng.tech. miet. iod managing director...
TRANSCRIPT
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GrayBarPoint Heating Presentation
Graeme J Ford
Eng.Tech. MIET. IoD
Managing Director
GrayBar Limited
UK
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GrayBar
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Welcome Who are we ? Our Customers Railway Cable Accessories Railway Points Heating Systems DC Contact Rail Heating System Design Manufacture Commission
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Product Locations UK – Network Rail UK – Light Rail & Tram Systems Northern Ireland Iarnrod Eireann Belgium France Sweden Finland Norway USA
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Introduction
Basic principles of Point Heating Installations
Why Heat Points ?
How is Point Protection achieved ?
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Efficient Point Heating
Many railway switch points suffer during the winter months, from snow and ice restricting the moving rails and point mechanisms
The solution is efficient and reliable electric point heating
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Types Of Point Heating
High performance Self Regulating Heaters
Traditional Constant Wattage Heaters
Constant Wattage Pad & Cartridge Heaters
Gas Heating Oil Heating
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Constant Wattage Heaters
Disadvantages; Traditional – Old Technology Short Fixed Lengths Limited life span Constant current draw Ridged inflexible heater Poor low temperature performance 12 month product warranty
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Self-Regulating Heaters
Advantages; High Performance polymer Extremely reliable - no filament Flexible elements Long circuit lengths Long life ( 40+ years) Efficient power draw Universally accepted 10 year product and system Warranty
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•Assesses ambient/rail temperature along entire heater length
•Equivalent to millions of hot and cold rail sensors
•Unlike ‘constant wattage’ heaters cannot suffer ‘burnout’
•Only draws current required to heat rail at that specific point
•Flexible heater
•Easy transportation and storage
•Long circuit lengths available
Self – Regulating Heater Element
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Chamber Test Self-regulating Point Heating
-30-25-20-15-10
-505
10152025
1hr 2hr 3hr 4hr 5hr 6hr 7hr 8hr
Air Temp
Current
Rail Temp
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xx
Poor Heater Positioning
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Correct Heater Strip Positioning
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Rev Date By Description Ckd Aprd
GrayBar Tel: 01933 676700
Fax: 01933 676800
Project
Catalogue Drawing Title
Heater Layout – 113lb 4-Way Drawn By Date Checked By Date Approved By Date
ALT Mar 02 Scale Sheet size
NTS A4 Drawing No.
DRO 144 This drawing is the property of GrayBar and may not be reproduced without permission.
Switch RailStock Rail
Section A - A
A
A
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Insulated Self–Regulating Heaters
Spring clip fixing Fibreglass heat
shield; Improves heat
transfer to rail; Compliant with
Network Rail Specification
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Fitted Heater Elements
Example of self-regulating insulated heaters and GRP heatshield fitted to bullhead rail points in a DC electrified area (Network Rail)
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Typical UIC 60 type point heating installation
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Heating fitted to HPSS type point
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Point Heating Design
Utilise all the benefits of Self-regulating insulated heaters,
Install combined control/transformer cubicles with simple weather sensors,
Minimise Cabling on-track e.g. use longer heater elements (up to 22 metres) and remove the need for rail probes,
Use off-track junction boxes, Reduce material and installation costs, Keep maintenance needs to a minimum.
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Controlling The Heaters
Transformers to provide the correct voltage to the heaters
Control cubicle Associated cabling Suitable power supply
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Simple Controls for Self-regulating Point Heating
Air temperature sensor Snow detector Set point e.g. +3°
Note
No need for Rail temperature probes
No need for complex switching of heaters
No PLC required
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Basic circuit arrangement
PRECIPITATIONSENSOR
TEMPERATURECONTROLLER
HOT/COLD RAILSENSORS
REMOTE CONDITION
MONITORING
MANUALOVERRIDE
CONTROLSYSTEM
CONTACTORFOUR
CONTACTORONE
CONTACTORTWO
CONTACTORTHREE
TRANSFORMERS1 TO 3
TRANSFORMERS4 TO 6
TRANSFORMERS7 TO 9
TRANSFORMERS10 TO 12
POINT HEATING,POINTS 1 TO 3
POINT HEATING,POINTS 4 TO 6
POINT HEATING,POINTS 7 TO 9
POINT HEATING,POINTS 10 TO 12
CONTROLROOM
WIRELESSGSM LINK
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Typical R.C.M. Cable Layout - Complex Design
Roadway
Pavement
Pavement
OHL Structure
Transformer
Control Cubicle
Supply Cubicle
Network Rail
Boundary Fence
Signal Location Case
Signal Post
Barrier/Handrail
Hot and Cold Rail sensors
Steel Bridge
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Roadway
Pavement
Pavement
OHL Structure
Control Cubicle
Supply Cubicle
Network Rail
Boundary Fence
Signal Location Case
Signal Post
110v 8-Core Heater Feed/Monitoring Cable
Recommended Point Heating Layout
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Premier Cubicle GrayBar trackside
control cubicle
All controls in the cubicle
Can control all forms of electric strip point heating
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Cubicle Transformers Integral
transformers mounted inside control cubicle
Easy maintenance in a safe location
All cable connections are base entry
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Channel Tunnel Rail Link This is a Universal Back
to Back Cubicle (St.Pancras throat).
Front houses the system controls
The back houses the transformers
All in the one location for a safer and more reliable maintenance regime
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St Pancras Station Approach
Graybar designed, manufactured and commissioned the point heating for whole of the high speed Channel Tunnel Rail Link (HS1) between London and the Channel Tunnel
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GrayBar Kits – Clip it and goTools needed:
-Hammer
-Screwdriver
Tools supplied in our heater kit:
-grease brush
-wire brush
-full installation instructions
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Self-regulating heater around chair block
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Off Track Junction Box
For connecting the heater leads to the heater feeder cable
Safe method of working off the track
Easy access to all cable connections
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Heater kit packaging
Complete Heater Kits In Easy To Transport, Store & Carry Boxes
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Transportation to site
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Special Installations
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Swingnose Heating
Swingnose with 380 Watt Per Metre double element insulated self-regulating heaters with heat shield (Network Rail)
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DC Contact Rail Heating
Illustration of general arrangement of 750 volt DC conductor rail heating. Self-Regulating heater circuits up to 200 metres in length
Section of rail
Side view
DRO 03
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Light Rail & Tram Point Heating
The light rail and tram systems in the UK have exclusively selected Graybar self-regulating heaters since 1990 e.g…
Croydon (South London) Tram
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Tram Points Heating
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Tram Control Cubicle
Stainless steel modular tram control cubicle similar to our Network Rail cubicles but modified for public street locations
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Installing Cables on a Tram System
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Connection box
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London Underground, Metronet have recommended and installed the Graybar self-regulating insulated heating system over many years
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London Underground installation
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Network Rail Company Line Standard and Code of Practice
RT/E/S/40045 & RT/E/C/45002
Graybar self-regulating point heating system has product approval:
NR Certificate PA05/688
Performance Specification and Code of Practice
•Allows innovative solutions
•Mandatory Documents
•Important Note: Graybar self-regulating heaters with a heat shield have been proven to comply with the low temperature performance requirements of the standard
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CTRL Section 2 GrayBar Point Heating
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HPSS Applications
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In Action – snow melted
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Sweden
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End of our presentation
Now the start of the Points Heating Season
Plan now for optimum end results
GrayBar for all Your Points Heating © GrayBar
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Cable Accessories