assumption university thailand ee4503 electrical systems design cable 1
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Assumption University Thailand
EE4503Electrical Systems Design
Cable
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Assumption University Thailand
Topics
• Introduction to Cables
• Cables for low voltage
• Cables for high voltage
• Cable selection
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Assumption University Thailand
Cables
• Functionality
– Conduct electrical power from one point to other
• Components
– Conductor
– Insulator (optional)
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Assumption University Thailand
Cables - Conductor
• Physical
– Solid
– Strand: flexible, reduce skin effect
• Material
– Copper
– Aluminum
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Assumption University Thailand
Cables - Conductor
http://www.cedengineering.com/upload/Electrical%20Conductors.pdf http://www.geindustrial.com/Newsletter/Aluminum_vs_Copper.pdf
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Assumption University Thailand
Cables - Insulator
• Prevent the physical contact: between two
cables, cable-to-ground
– Physical durable e.g. impact, heat
– Chemical durable, e.g. erosion
• Commonly used
– Polyvinyl Chloride (PVC)
– Cross linked Polyethylene (XLPE)6
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Assumption University Thailand
Cables - Insulator
http://www.gridcables.com/power-cable.html
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Assumption University Thailand
Cables for High Voltage
• Withstand the high voltage: insulator (if any)
need to be good.
• Long distance transmission: Cable cost &
Installation cost (e.g. electricity pole)
• Two main types
– Bare Wires (reduce cost)
– Insulated Wires8
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Assumption University Thailand
High Voltage CablesBare Wires
• Made of Aluminum for lower cost
• Transmission system (not distribution system
for safety): Reduce usage: animals, accident, etc.
• AAC: All Aluminum Cable
• AAAC: All Aluminum Alloy Cable
• ACSR: Aluminum Conductor Steel Reinforced9
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Assumption University Thailand
High Voltage CablesBare Wires
• AAC: Basic type, for shorter span
• AAAC: Improve the property of Aluminum by making it as an alloy stronger, larger span, corrosion resistance (e.g. sea)
• ACSR: Insert the steel in the core to have more tension.
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Assumption University Thailand
High Voltage CablesInsulated Wires
• For safety and prevent interruption
• PIC: Partial Insulated Cable
• SAC: Space Aerial Cable
• XLPE: Cross-linked
Polyethylenehttp://www.huffingtonpost.co.uk/2012/03/26/northamptonshire-fire-crew-hot-air-balloonist_n_1378971.html
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Assumption University Thailand
High Voltage CablesInsulated Wires - PIC
http://www.thaiyazaki-electricwire.co.th/products/pdf/edit_pdf/hvmvpc/33kv_oc.pdf
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Assumption University Thailand
High Voltage CablesInsulated Wires - SAC
http://www.thaiyazaki-electricwire.co.th/products/pdf/edit_pdf/hvmvpc/35kv_cc.pdf
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Assumption University Thailand
High Voltage CablesInsulated Wires - XLPE
http://www.thaiyazaki-electricwire.co.th/products/pdf/edit_pdf/hvmvpc/115kv_ce.pdf
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Assumption University Thailand
Cables for Low Voltage
• Below 750V
• Conductor: Aluminum or Copper
• Insulator: PVC or XLPE
• Number of Conductor: 1 or many
• Special Type to suite the need: Fire Retardent
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Assumption University Thailand
Cables for Low Voltage(see pdf)
• PVC
– NAY (aluminum)
– THW
– VAF
– VCT
– NYY (double shealth)
• XLPE
– CV
• MI
• Fire Safety Cable
– Flame Retardant
– Fire Resistant16
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Assumption University Thailand
Cables for Low VoltageFire Resistant Cable
• Flame Retardancy
• Flame Propagation
• Acid and Corrosive Gas Emission
• Smoke Emission
• Fire Resistance (Circuit Integrity)
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Assumption University Thailand
Cables for Low VoltageFire Resistant Cable
• Fire Alarm System
• Building Automation System
• Emergency Lighting System
• Public Address System
• Standby Power System
• Computer Network System
• Closed Circuit TV System
• Elevators and Escalators System
• Fire Pumps and Pressurized Stairs
• Etc.
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Assumption University Thailand
Assignments
• Take pictures of the cable that you can see and classify the types of those cables.
• Take pictures of the name-plates
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Assumption University Thailand
Cable Selection
• Usage: Table 5-16 (EIT Standard 2001-51) for low
voltage cable
• Rated Voltage: 300V or 750V
• Rated Current
• Multiple Conductors
• Voltage Drop20
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Assumption University Thailand
Cable Selection – Rated Current
• Size of Conductor
• Type of Insulator
• Ambient Temperature
• Installation Conditions:
– Calculation: BCC - Technical_data_Cable
– Table: BCC - InstallationGuide, AS_NZS_3008.1.1_2009
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Assumption University Thailand
Cable Selection – Rated CurrentInstallation Conditions (3.1)
Handout: BCC - Installation Guide.pdf
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Assumption University Thailand
Cable Selection – Rated CurrentInstallation Conditions (3.1t)
Handout: BCC - Installation Guide.pdf
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Assumption University Thailand
Cable Selection – Rated CurrentInstallation Conditions (3.2)
Handout: BCC - Installation Guide.pdf
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Assumption University Thailand
Cable Selection – Rated CurrentInstallation Conditions (3.2t)
Handout: BCC - Installation Guide.pdf
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Assumption University Thailand
Cable Selection – Rated CurrentInstallation Conditions (3.3)
Handout: BCC - Installation Guide.pdf
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Assumption University Thailand
Cable Selection – Rated CurrentInstallation Conditions (3.3t)
Handout: BCC - Installation Guide.pdf
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Assumption University Thailand
Cable Selection – Rated CurrentNumber of Cables in a Conduit
Handout: BCC - Installation Guide.pdf
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Assumption University Thailand
Cable Selection – Multiple Conductors
• To increase the rated current
Handout: BCC - Installation Guide.pdf
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Assumption University Thailand
Cable Selection – Multiple Conductors
• Only for cable from 50 sq.mm. and up
• Same type of cables
• Same length
• Same wiring method
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Assumption University Thailand
Cable Selection – Voltage Drop
• Voltage drop due to the impedance of the cable
• NEC
– Main incoming to load: no more than 5%
– Feeder: no more than 2%
– Branch Circuit: no more than 3%
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Assumption University Thailand
Cable Selection – Voltage Drop
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Zcable
Zload
220 V (AC)
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Assumption University Thailand
Cable Selection – Voltage Drop
• Load: is from the consumption and power factor: or
• Cable: is from the table ( and )
– depends on the wiring configurations.
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Assumption University Thailand
Cable Selection – Voltage DropCalculation
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• Use the normal voltage divider in the calculation.
– =
– =
– ????
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Assumption University Thailand
Cable Selection – Voltage DropCalculation
http://www.east-med.schneider-electric.com/documents/electrical-distribution/en/shared/eig_guide2010/Doc-pour-visualisation_basse_def.pdf
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Assumption University Thailand
Cable Selection – Rated CurrentCalculation
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http://www.east-med.schneider-electric.com/documents/electrical-distribution/en/shared/eig_guide2010/Doc-pour-visualisation_basse_def.pdf
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Assumption University Thailand
Equivalent CircuitsImpedance: table for PVC cables
and
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Size () Resistance()
Reactance()
2.5 7.400 0.155
4 4.625 0.141
6 3.083 0.131
10 1.850 0.121
16 1.156 0.113
25 0.740 0.107
35 0.529 0.103
50 0.370 0.100
Electrical Systems Design: ประสิ�ทธิ์�� พิ�ทยพิ�ฒน์�
Size () Resistance()
Reactance()
70 0.264 0.097
95 0.195 0.096
120 0.154 0.094
150 0.123 0.092
185 0.100 0.091
240 0.077 0.090
300 0.062 0.089
400 0.051 0.088
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Assumption University Thailand
Cable Selection – Rated CurrentFrom Table
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http://www.east-med.schneider-electric.com/documents/electrical-distribution/en/shared/eig_guide2010/Doc-pour-visualisation_basse_def.pdf
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Assumption University Thailand
Cable Selection – General Rules
• 20% to 25% factor.
• Using current or VA (not power).
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Assumption University Thailand
Cable Selection – Examples
• Water Heater 6kW
– in Air or in Metal Conduit
• Microwave 2,300VA
• Industrial Heater 40kW, 400V 3phase
– 40oC or 50oC
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Assumption University Thailand
Cable Selection – Examples
• Motor 37kW, 400V, In=72A
– DOL & Star-Delta
• Motor 60kW, 400V, pf.=0.8
• Room
– receptacles 2.5kVA
– lighting 500VA41
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Assumption University Thailand
Handout
• BCC - Installation Guide
• HELUKABEL - Installation Operating Conditions
• AS_NZS_3008.1.1_2009
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Assumption University Thailand
• Electrical Systems Design: ประสิ�ทธิ์�� พิ�ทยพิ�ฒน์�• Thai Electrical Code 2002: EIT Standard 2001-51
• http://www.bangkokcable.com
• http://www.thaiyazaki-electricwire.co.th
• Electrical Installation Guide 2010: schneider-electric
Reference
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