High Reliability Power System Design - IEEE - Argentina

165 Pages·2010·1.55 MB·English

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Buenos Aires, Argentina
June 25 & 26, 2009
Keene M. Matsuda, P.E.
Regional Electrical Manager
Senior Member IEEE
IEEE/PES Distinguished Lecturer
[email protected]
Agenda
3 case studies for high reliability power systems
(cid:122)
Design concepts
(cid:122)
Start with basics for simple circuit design
(cid:122)
Considerations for temperature, safety, etc.
(cid:122)
Build system with transformers, switchgear, etc.
(cid:122)
Overall power system design
(cid:122)
2008 National Electrical Code (NEC)
(cid:122)
“Bible” for designing electrical systems in USA
(cid:122)
Page-2
Page-3
U.S. Typical System Voltages
120 V, for most small loads like laptops
(cid:122)
120/240 V, 1-phase distribution
(cid:122)
208Y/120 V, 3-phase distribution
(cid:122)
480Y/277 V, 3-phase distribution
(cid:122)
4.16Y/2.4 kV, 3-phase distribution
(cid:122)
12.47Y/7.2 kV, 3-phase distribution
(cid:122)
Utility Distribution: 12 kV, 23 kV, 34.5 kV, etc.
(cid:122)
Utility Transmission: 46 kV, 60 kV, 115 kV, etc.
(cid:122)
All at 60 Hz
(cid:122)
Page-4
Simple Circuit Design for 480 V, 100 Hp Pump
480 V, 3-Phase Power
Cables & Conduits
Combination
Circuit Breaker
Motor
(Over Current Protective Device)
Starter
Motor
Motor Contactor
Starter
Motor Overload
Cables & Conduits
M 100 Hp Motor
Page-5
Simple Circuit Design for 480 V, 100 Hp Pump
BASIC ELEMENTS
(cid:122)
Load: 100 Hp pump for moving liquid
(cid:122)
Cables & Conduit: Conveys power, safely, from
(cid:122)
motor starter to pump
Motor Overload: Provides protection to motor from
(cid:122)
overload conditions (e.g., bimetallic strip, electronic)
Motor Contactor: Allows passage of power to motor
(cid:122)
from source
Circuit Breaker (OCPD): Provides overload and short
(cid:122)
circuit protection
Page-6
Simple Circuit Design for 480 V, 100 Hp Pump
Cables & Conduit: Conveys power, safely, from
(cid:122)
power source to motor starter
Power Source: 480 V, 3-phase, 60 Hz
(cid:122)
Control: Not shown in single line diagram
(cid:122)
Control Methods: Level switch, flow sensor, pressure
(cid:122)
sensor, manual start/stop, automated control system,
PLC, DCS, SCADA, etc.
PLC = Programmable Logic Controller
(cid:122)
DCS = Distributed Control System
(cid:122)
SCADA = Supervisory Control and Data Acquisition
(cid:122)
Page-7
Simple Circuit Design for 480 V, 100 Hp Pump
Page-8
Simple Circuit Design for 480 V, 100 Hp Pump
Page-9
Simple Circuit Design for 480 V, 100 Hp Pump
DESIGN CALCULATIONS
(cid:122)
A. Determine full-load current, IFL
(cid:122)
B. Size motor starter
(cid:122)
C. Size overcurrent protection, breaker
(cid:122)
D. Size conductors for cables
(cid:122)
E. Size grounding conductor
(cid:122)
F. Size conduit for cables
(cid:122)
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