power_monitoring.pdf

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Table of Contents
Introduction .......................................................................................2
Monitoring and Managing Electrical Power with ACCESS .......4
Electrical Power Distribution ..........................................................5
Voltage and Current Values .............................................................9
Changes in Voltage and Current ...................................................16
Frequency and Harmonics ........................................................... 22
Power and Power Factor .............................................................. 27
ACCESS System ........................................................................... 37
WinPM and SIEServe ................................................................... 38
Communication Protocols and Standards ................................. 41
Local Area Networks .................................................................... 44
Serial Communication .................................................................. 46
Power Metering ............................................................................. 54
Power Meter Features .................................................................. 63
Protective Relays and Trip Units ................................................. 66
Circuit Breaker Trip Units .............................................................. 68
SAMMS .......................................................................................... 72
S7 I/O Device ..................................................................................74
Lighting Control System ...............................................................76
ACCESS System Application Example ..................................... 79
Review Answers ........................................................................... 81
Final Exam ...................................................................................... 82
1
Introduction
Welcome to another course in the STEP 2000 series, S iemens
T echnical E ducation P rogram, designed to prepare our sales
personnel and distributors to sell Siemens Energy &
Automation products more effectively. This course covers
Power Monitoring and Management with ACCESS and
related products.
Upon completion of Power Monitoring and Management
with ACCESS you should be able to:
•
Identify five benefits of using the ACCESS system
Explain the difference between peak, peak-to-peak,
instantaneous, average, and effective values of AC current
and voltage
•
•
Identify linear and nonlinear loads
•
Explain various industry terms for voltage conditions
•
Describe a CBEMA curve
Explain the effects of harmonics on a distribution system
and associated equipment
•
•
Explain the difference between true power, reactive power,
and apparent power
•
Identify solutions for various power supply problems
•
Select appropriate power meters for use in a distribution
system
•
Explain various communication standards and network
protocols
•
Explain the use of various components in an ACCESS
controlled distribution system
2
This knowledge will help you better understand customer
applications. In addition, you will be able to describe products to
customers and determine important differences between
products. You should complete Basics of Electricity before
attempting Power Monitoring and Management with
ACCESS . An understanding of many of the concepts covered in
Basics of Electricity is required for Power Monitoring and
Management with ACCESS .
If you are an employee of a Siemens Energy & Automation
authorized distributor, fill out the final exam tear-out card and
mail in the card. We will mail you a certificate of completion if
you score a passing grade. Good luck with your efforts.
Sentron and Sensitrip are registered trademarks of
Siemens AG. ACCESS, WinPM, SIEServe, SIPROTEC,
Static Trip III, SAMMS and S7/IO are trademarks of Siemens AG.
Other trademarks are the property of their respective owners.
3
Monitoring and Managing Electrical Power
with ACCESS
Siemens ACCESS™ is more than just power meters, trip units,
and other hardware. The ACCESS power management and
control system is a networked system comprised of a variety of
devices that monitor and control an electrical distribution
system. The ACCESS system provides electrical data necessary
for troubleshooting, power quality studies, preventative
maintenance, and cost allocation. A power monitoring and
management system, such as Siemens ACCESS, can identify
potential problems before they cause costly breakdowns.
There are five benefits to using the ACCESS system.
• Reduce or eliminate unplanned outages
• Proactively manage power systems to minimize utility bills
• Automate sub-billing of utility power bills
• Optimize capital equipment used in power systems
• Measure and analyze power quality
4
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Electrical Power Distribution
Before discussing the Siemens ACCESS system an
understanding of the production, distribution, and use of electric
power is necessary.
Electric power is produced by converting potential energy into
electricity. There are several sources used to produce electric
power. Coal, oil, and uranium are fuels used to convert water
into steam which in turn drives a turbine. Some utilities also use
gas or a combination of gas and steam turbines. There are other
forms of electric power generation such as hydroelectric and
solar energy plants.
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