ee4503 electrical systems design

Assumption University Thailand

EE4503Electrical Systems Design

Introduction

1


Topics

• Understand the electrical systems design

• Know the standards used in this class

• Electrical Power Systems– Production / Generation

– Transmission

– Distribution + Utilization2


Electrical Systems Design

3


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 Laws4


Where?

5


• Electrical Power Systems– Delivery of the electrical power to the users

– Protection of the electrical systems

• Communication Systems– Delivery of the electrical signal

What?

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• Telephone Systems

• Fire Alarm Systems

• Master Antenna TV Systems

• Security & Closed Circuit TV Systems

• Sound Systems

• Building Automation Systems

What is Communication Systems?

7


• Power Distribution Systems

• Lighting Systems

• Standby Power Systems

• Lightening Protection Systems

• Vertical Transportation Systems (today might include horizontal as well)

What is Electrical Power Systems?

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• 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

What do we have to do?

9


• Single Line Diagrams– Riser Diagram

• Load Schedule Tables

• Plans– Lighting

– Receptacles

What are outcomes?

10


• Requirements

• Specifications– Equipment

• Installation Details

• Wiring diagrams

What are outcomes (details)?

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• Safety

• Minimum Initial Investment

• Maximum Electrical Efficiency (Minimum Operating Costs): e.g. power factor control, transformer loss, zoning lighting control

• Minimum Maintenance Cost

What is a Good Design?

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• 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.

What is a Good Design?

13


Standards

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Common agreement on some technical issues :

• Standards for electrical equipment– Cable, Circuit breaker, Switch, etc.

• Standards for installation *** operation– Safety distance between 12kV cable

What are standards?

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• National Standards: to server the need of each country– NEC, ANSI, BS, DN, VDE, JIS, TIS (มอก.)

• International Standards– ISO, IEC, EN

Is there a single standard?

16


Standard Comparison (examples)• Frequency: 60 Hz

• Voltage: 208/120V, 480/277V

• Cable: AWG

• Dimension: inch, feet

• Weight: pound

• Frequency: 50 Hz

• Voltage: 380/220V, 400/230V

• Cable: mm2

• Dimension: m

• Weight: kg

Electrical System Design, ประสทิธิ ์พทิยพฒัน์

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http://literature.rockwellautomation.com/idc/groups/literature/documents/wd/100-wd001_-en-p.pdf

Electrical Symbols

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Electrical Symbols

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Electrical Symbols

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Electrical Power Systems

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http://venturebeat.files.wordpress.com/2010/10/grid.jpg

Overview of Power Systems

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• Steam power plant: from lignite, oil, natural gas to nuclear

• Combustion power plant: gas-turbine, diesel

• Combined Cycle power plant: combined the above two

Electrical Power Plant (major)

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• Hydro power plant: Dam, pico-hydro

• Solar cell

• Wind turbine

• ** Steam power plant: sterling engine

Electrical Power Plant (minor)

24


• EGAT: Electrical Generating Authority of Thailand

– Generation / Transmission

• MEA: Metropolitan Electricity Authority

– Transmission / Distribution / Utilization

• PEA: Provincial Electricity Authority

– Gen. / Trans. / Distribution / Utilization

Big Three by Thai Law

25


• EGAT is the main electrical power generation (by law)

• Private Power Producer (sell to EGAT)– Independent Power Producer (IPP)

– Small Power Producer (SPP)

Generation

26


• Long distance distribute of power

• High voltage

• High reliability (N-1, N-2, etc.)

• Network of Transmission Power Grid– High reliable, efficiency

Transmission

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http://www2.egat.co.th/apg/images/APG_MAP.png

ASEAN Power Grid

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• Low voltage– 220V 1 phase 2 wires

– 380/220V 3 phase 4 wires

• High voltage– 12kV (11kV), 24kV (22kV)

– 69kV, 115kV

Distribution

29


• Simple Radial

• Primary-Selective System

• Secondary-Selective System

• Loop-primary system

• etc.

Backbone Distribution

30


Electrical Power Distribution Systems Operations, D.B.Campbell

Backbone DistributionSimple Radial

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Backbone DistributionSecondary Selective

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Backbone DistributionPrimary Selective

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Depend on the area

• Overhead cable

• Underground cable from Overhead cable

• Underground cable from Underground cable

Distribution to End-user

34


• Electrical Systems Design, ประสทิธิ ์พทิยพฒัน์

• Electrical Power Distribution Systems Operations, D.B.Campbell

Reference

35

ee4503 electrical systems design

Documents

electrical systems designknow

electrical signalwhat

electrical sighanlpage

power outlets

incoming power source

different rules

regulations laws

works large scale