Common Application of Busduct

Busduct System
Schneider Busway
Common Application of Busduct
„ Transformer to Switchboard
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Common Application of Busduct
„ Horizontal Plug-in Busduct
– Large Scale Factory, e.g. HAECO
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Common Application of Busduct
„ Vertical Plug-in Riser
– Typical Comm., Ind., Res. in HK
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Common Application of Busduct
„ Switchboard to Switchboard
– Example: Main Sw Bd to A/C Plant
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Basic Construction of Busduct
„ Sandwich type construction
„ Less space requirement
„ Improve heat dissipation
„ Reduce temperature rise
„ Higher current rating available
„ Various IP rating available
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High Grade Copper Busbar
„ High conductivity copper
„ Silver plated over full length, enhance low
contact resistance and high conductivity
„ Thickness of copper bar = 6.3 mm
„ Rectangular design enhance heat dissipation
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Temperature Rise
„ Sandwich construction and high conductivity
copper busbar Ætemp.rise less than 55oC at
full load
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Busbar Insulation
„ 2 layers 0.2mm Mylar insulation
(IEC requires 1 layer)
„ Excellent dielectric properties
„ 0.1mm Mylar can withstand 7000V
„ Class B insulation (130oC)
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Integral Ground Bus
„ 1.6mm Aluminum enclosure
as ground bus
„ 50% continuous capacity
„ Lower ground impedance
„ Comply with international
requirement, UL, IEC, IEE
wiring regulation
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EZ Joint Pak
„ Schneider Patten Design
„ Single bolt connection
– Double head
– Visible tighten torque
– Belleville washer
– Tighten torque = 105N-m (70
lb-ft)
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EZ Joint Pak
„ Electroplated surface reduce
contact resistance
„ Each joint pak allows 3 mm
adjustment for thermal
expansion
„ Reduce installation time and
equipment
„ Improve reliability
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Product Range
„ Feeder, Riser , Plug-in
„ Common Rating 200A-600A & 800A-5000A
„ Rated Voltage = 600V
„ IP rating:
– Feeder : IP40, IP41, IP54, IP65, IP66
– Plug-in / Riser : IP40, IP54
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Common Fitting
„ Elbows
– Standard 90o
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Common Fitting
„ Elbows
– Other shape available upon request e.g.
Double elbows, Offset, Elbow + flanged end
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Common Fitting
„ Flanged End
– For connection to Switchboard
– For connection cable to busduct
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Common Fitting
„ Expansion Joint
– Allow ±38mm expansion
– Apply where busduct pass through structural
expansion joint
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Vertical Hangers
„ Fixed hangers
„ Spring Hangers
– Apply in new building
– Eliminate the effect of
settlement
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Plug-in Units
„ Fusible PIU (30A-1600A)
„ MCCB PIU (16-1600A)
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Plug-in Units
„ High level of safety
– Complete insulated conductor
– Interlocks
– Contact earth terminal first
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System Design
„ Cable Vs busduct
„ Choice of breaking capacity, IP rating
„ Earthing system arrangement
„ Voltage drop consideration
„ Provision for expansion
„ Harmonic issue
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Cable Vs Busduct
„ Busduct system have advantage in high ampere
range, say 600A or up
„ Comparison between cable & busduct
Cable
Busduct
Space requirement
High
Low
Heat Dissipation
Poor
Good
Temperature rise
Poor
Good
Voltage Drop
High
Fair
Electromagnetic Interference
High
Low
Labour Cost
Higher
Lower
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Choice of Breaking Capacity
„ Breaking Capacity
– Main distribution Vs Submain Distribution
– 1 sec and 3 sec requirement
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Choice of IP Rating
„ Minimize water hazard
„ Horizontal Vs Vertical
„ Corridor Vs meter room
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Earthing System Arrangement
„ IGB through out the whole run of busduct
„ No need for additional or external earthing
conductor
„ Each tap-off box bond to IGB
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Voltage Drop Consideration
„ 4% Voltage drop from source to final circuit
(IEE Wiring Regualtion)
„ Longer the busduct length, Higher the voltage
drop
„ Try to shorten length of busduct
„ Upgrade the busduct, e.g use 1200A busduct
for 1000A circuit
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Provision of Expansion
„ Thermal expansion
– Busbar thermal expansion absorbed by joint
pack
– No need to install any expansion joint
„ Structural expansion
– Busduct cannot absorb expansion
– Shear force can damage busduct
– Expansion fitting should be installed
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Harmonic Issues
„ Generated by Non-linear load, e.g. UPS,
Inverters, High frequency lamps
„ Can overheat neutral conductor
„ Alter the operation of Tx, Capacity bank
„ Affect the normal operation of switchgear
Ænuisance tripping
„ 200% neutral busduct cannot solve the
problem
„ Apply power control equipment, like harmonic
filter OR Upgrade the whole busduct
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Installation Procedure
„ Video of Installation (about 8 minutes)
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Water / Dust Precaution
„ Provide alternative path / heating point
„ Damage insulation
„ Latent hazard of short circuit
„ Measurement
– Double packing (plastic bag+carton box)
– Apply “rain coat” provided by manufacturer
after installation each day
– Proper storage management
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Water / Dust Precaution
„ Double packing (plastic bag+carton box)
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Water / Dust Precaution
„ Double packing (plastic bag+carton box)
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Water / Dust Precaution
„ Apply “rain coat” provided by manufacturer
after installation each day
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Water / Dust Precaution
„ Proper storage management
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Quality Project Management Services
„ Product Training
„ Site Measurement
„ Optimum busduct routing design
„ Detail shop drawing preparation
„ On site technical support
„ Training on installation procedure
„ “Missing Link” and “Remedial Units”
„ Joint inspection (not contractual service)
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Missing Links / Remedial Units
„ Missing link – reserve 1 pc of busduct for final measurement
– Increase accuracy of busudct dimension
– Save time for rectifying installation mistake
– Streamline the installation
Missing Link
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Missing Links / Remedial Units
„ A neighborhood factory enhance fast delivery of
missing links and remedial units (within 1 week
delivery to HK)
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Contractor-Supplier Interaction
Project Start
Technical support
and routing deisgn
After sales services
and missing links
AutoCad Drawing
Installation support
We are not only a
busduct supplier
Project
Management
Support
BRASS and
manufacturing
instruction
Fabrication
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Testing & Commissioning - Factory
„ Factory Test – 7500V dc Hi-pot
Test
„ 100% test before delivery
„ Insulation = 10MΩ/ ft
– (IEC require 1MΩ/ ft )
„ Check weak point of insulation
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Testing & Commissioning – On Site
„ Mega test before any energization
– NEMA:
MΩ =100/ Length of Busduct in Ft (1000V)
– HK Code of Practice
0.5 MΩ at 500Vdc
„ Ductile test of entire length
„ Joint inspection by both contractor and supplier
– Alignment, Installation procedure,etc
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Maintenance Issues
„ Vertical spring hanger adjustment
„ Bowing Symptom
„ Thermal checking/ scanning
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Vertical Spring Hanger Adjustment
„ Adjustment need after a period of usage, esp
new building
„ Make compensation for settlement and
concrete shinkage
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Vertical Spring Hanger Adjustment
„ Adjust the length of spring to provide adequate
vertical support to busduct
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Bowing Symptom
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Bowing Symptom
„ Common causes
– Misalignment
– Improper installation, e.g. loosen bolts
– Improper vertical support
„ Uneven pressure or expansion force the
busduct to bend at “weak points”
„ Bowing can make permanent deforming of
busduct
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Thermal Checking / Scanning
„ Improper installation Æ poor contact
„ Abnormal temperature rise (usually
happened in joints)
„ Collect temperature data and compare
„ Find out the abnormal heating point and
rectify
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Trouble shooting
„ Common causes of burnt busduct
– Water/dust ingress during installation stage
– Water ingress after energize (for IP40
mainly)
– Improper installation, e.g. misalignment,
lossen bolts
„ Some real examples
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Some Real Examples
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Some Real Examples
Schneider Busway
Some Real Examples
Schneider Busway
Some Real Examples
Schneider Busway
Some Real Examples
Schneider Busway
Some Real Examples
Schneider Busway
Some Real Examples
Schneider Busway
Some Real Examples
Schneider Busway
Some Real Examples
Schneider Busway
Some Real Examples
Schneider Busway
Some Real Examples
Schneider Busway
Some Real Examples
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Trouble Shooting
„ Recommend spare parts
– 1 pair of flanged ends for each busduct
rating used
– A number of plug-in units
„ 24-hours services hotline provided by
Schneider Busway
– 7298 9771(for HK Market)
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End of Presentation!
Thank you!
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