Assumption University
Thailand
EE4503
Electrical Systems Design
Introduction
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Thailand
Topics
• Understand the electrical systems design
• Know the standards used in this class
• Electrical Power Systems
– Production / Generation
– Transmission
– Distribution + Utilization
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Electrical Systems Design
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Thailand
What we have to do?
Design the electrical systems according to
the standards
• Know the standards
• Apply the standards
• Know theory behind the standards
Rules, Regulations  Laws
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Where?
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What?
• Electrical Power Systems
– Delivery of the electrical power to the users
– Protection of the electrical systems
• Communication Systems
– Delivery of the electrical signal
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What is Communication Systems?
• Telephone Systems
• Fire Alarm Systems
• Master Antenna TV Systems
• Security & Closed Circuit TV Systems
• Sound Systems
• Building Automation Systems
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Thailand
What is Electrical Power Systems?
• Power Distribution Systems
• Lighting Systems
• Standby Power Systems
• Lightening Protection Systems
• Vertical Transportation Systems (today
might include horizontal as well)
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Thailand
What do we have to do?
• Design the electrical systems according to
– Safety (including Standards, Rules, Regulations)
– Customer need
• Cooperate with others: mechanical and civil
• Detail specifications of the systems
• Cost estimation
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What are outcomes?
• Single Line Diagrams
– Riser Diagram
• Load Schedule Tables
• Plans
– Lighting
– Receptacles
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What are outcomes (details)?
• Requirements
• Specifications
– Equipment
• Installation Details
• Wiring diagrams
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What is a Good Design?
• Safety
• Minimum Initial Investment
• Maximum Electrical Efficiency (Minimum
Operating Costs): e.g. power factor control,
transformer loss, zoning lighting control
• Minimum Maintenance Cost
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What is a Good Design?
• Maximum Service Continuity: depend to the
need, e.g. hospital, office, computer center
• Maximum Flexibility and Expandability
• Maximum Power Quality: think about turning
on an air condition then computer hangs.
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Standards
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What are standards?
Common agreement on some technical
issues :
• Standards for electrical equipment
– Cable, Circuit breaker, Switch, etc.
• Standards for installation
– Safety distance between 12kV cable
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Is there a single standard?
• National Standards: to server the need of
each country
– NEC, ANSI, BS, DN, VDE, JIS, TIS (มอก.)
• International Standards
– ISO, IEC, EN
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Standard Comparison (examples)
• Frequency: 60 Hz
• Frequency: 50 Hz
• Voltage: 208/120V,
480/277V
• Voltage: 380/220V,
400/230V
• Cable: AWG
• Cable: mm2
• Dimension: inch, feet
• Dimension: m
• Weight: pound
• Weight: kg
Electrical System Design, ประสิ ทธิ ์ พิทยพัฒน์
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Electrical Symbols
http://literature.rockwellautomation.com/idc/groups/literature/documents/wd/100-wd001_-en-p.pdf
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Thailand
Electrical Symbols
http://literature.rockwellautomation.com/idc/groups/literature/documents/wd/100-wd001_-en-p.pdf
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Assumption University
Thailand
Electrical Symbols
http://literature.rockwellautomation.com/idc/groups/literature/documents/wd/100-wd001_-en-p.pdf
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Thailand
Electrical Power Systems
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Thailand
Overview of Power Systems
http://venturebeat.files.wordpress.com/2010/10/grid.jpg
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Electrical Power Plant (major)
• Steam power plant: from lignite, oil, natural gas
to nuclear
• Combustion power plant: gas-turbine, diesel
• Combined Cycle power plant: combined the
above two
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Electrical Power Plant (minor)
• Hydro power plant: Dam, pico-hydro
• Solar cell
• Wind turbine
• ** Stream power plant: stirling engine
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Big Three by Thai Law
• EGAT: Electrical Generating Authority of Thailand
– Generation / Transmission
• MEA: Metropolitan Electricity Authority
– Transmission / Distribution / Utilization
• PEA: Provincial Electricity Authority
– Gen. / Trans. / Distribution / Utilization
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Generation
• EGAT is the main electrical power
generation (by law)
• Private Power Producer (sell to EGAT)
– Independent Power Producer (IPP)
– Small Power Producer (SPP)
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Transmission
• Long distance distribute of power
• High voltage
• High reliability (N-1, N-2, etc.)
• Network of Transmission  Power Grid
– High reliable, efficiency
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ASEAN Power Grid
http://www2.egat.co.th/apg/images/APG_MAP.png
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Distribution
• Low voltage
– 220V 1 phase 2 wires
– 380/220V 3 phase 4 wires
• High voltage
– 12kV (11kV), 24kV (22kV)
– 69kV, 115kV
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Backbone Distribution
• Simple Radial
• Primary-Selective System
• Secondary-Selective System
• Loop-primary system
• etc.
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Backbone Distribution
Simple Radial
Electrical Power Distribution Systems Operations, D.B.Campbell
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Backbone Distribution
Secondary Selective
Electrical Power Distribution Systems Operations, D.B.Campbell
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Backbone Distribution
Primary Selective
Electrical Power Distribution Systems Operations, D.B.Campbell
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Distribution to End-user
Depend on the area
• Overhead cable
• Underground cable from Overhead cable
• Underground cable from Underground
cable
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Reference
• Electrical Systems Design, ประสิ ทธิ ์
พิทยพัฒน์
• Electrical Power Distribution Systems
Operations, D.B.Campbell
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