Welcome to the rd. Annual Northern Ohio. 3 rd Energy Management Conference September 30, 2008
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1 Welcome to the rd Annual Northern Ohio 3 rd Energy Management Conference September 30, 2008
2 Recover Lost Dollars Demand Side Electrical Energy Savings By Improving Distribution System Efficiency, Capacity and Power Quality Presented by Benjamin Rosolowski
3 Basic Issues Related to Electrical Distribution Reliability Capacity Safety Operating Costs
4 Terms & Definitions Sinusoidal Wave Forms Power Quality Electrical Loads Types Harmonics RMS Power Factor
5 Nature of a Sine Wave 1 cycle 360 degrees 1/60 second Positive peak AMPLITUDE AMPLITUDE Negative peak ZERO CROSSING WAVE ANGLE IN DEGREES (OR TIME)
6 Utilities Typically Supply Pure Efficient Power
7 Terms & Definitions Sinusoidal Wave Forms Power Quality
8 What is Power Quality? Power Quality is the quality of the electric power supplied to electrical equipment. There is no single way to completely quantify the quality of Power. Poor power quality can result in misoperation of the equipment and higher energy costs.
9 Most Common Power Quality Issues Voltage sags, dips & swells Voltage & Current Distortion Transients Harmonics Voltage Unbalance & Regulation Flicker Frequency variations Inrush Poor Power Factor
10 Poor power quality is reflected in your monthly electric bill as increased kw/kva (Demand) and kwh (Usage).
11 Symptoms of power quality problems can be categorized into two main areas: Equipment failure and misoperation Economic considerations
12 Terms & Definitions Sinusoidal Wave Forms Power Quality Electrical Load Types Resistive, Inductive Linear vs. Non Linear
13 Electrical Distribution System 64kV Utility Feed Typical Plant Loads Buss Duct DC Drives VFD s Outlets 480V/277V Xformer Motors Lighting 13.2kV/480V Dist. Xformer 2000A 3 Switchgear UPS s PC s MDP 400A 208V/120V HVAC Robotics Induction Furnace ARC Welder VFD s Typical Office Loads
14 Examples of Resistive Loads Incandescent Light Bulb Hot Plate Electric Hot Water Tank
15 Examples of Inductive Loads Transformers Motors Lighting Ballasts Induction Furnaces
16 Linear & Non-Linear Linear Load - The current waveform looks like the voltage waveform Non-linear Load The current waveform does not look like the voltage waveform The more the current looks like the voltage, the more linear the load
17 What do Non-Linear Loads have in common? Convert AC into DC Contain some kind of rectifier Induce harmonic currents React with the source to produce harmonic voltage distortion
18 Linear & Non-Linear Loads What is important? Linear Loads Draw their power at 60 Hz Non-linear Loads Draw their power from 60 Hz ; however, they reflect large amounts of harmonic current back into the distribution system
19 Single-Phase 2-pulse Diode Bridge (Schematic Diagram) + _
20 Electrical Distribution System 64kV Utility Feed Typical Plant Loads Buss Duct DC Drives VFD s Outlets 480V/277V Xformer Motors Lighting 13.2kV/480V Dist. Xformer 2000A 3 Switchgear UPS s PC s MDP 400A 208V/120V HVAC Robotics Induction Furnace ARC Welder VFD s Typical Office Loads
21 Three-Phase 6-Pulse Diode Bridge (Schematic Diagram) + _
22 Typical Non-Linear Loads (Two Pulse and Six Pulse Rectifiers) Computers Copy & Fax Machines Solid-State Lighting Ballasts Programmable Controllers DC Drive Systems VFD s Electroplating Processes Solid State UPS s Induction Furnace
23 Terms & Definitions Sinusoidal Wave Forms Power Quality Electrical Loads Types Harmonics
24 What are Harmonics? Integer multiples of the fundamental frequency (Voltage or Current at 60 hertz)
25 Table of Harmonics HARMONIC FREQUENCY U.S. POWER AIRCRAFT
26 Harmonic Waveforms Algebraically add and subtract to distort the fundamental waveform FUNDAMENTAL 3rd HARMONIC AMPLITUDE 5th HARMONIC WAVE ANGLE
27 Poor Power Quality ( Dirty ) <60%
28 Symptoms of Harmonic Problems Overheated phase conductors, panels, and transformers Random tripping of circuit breakers Premature failure of transformers and UPS systems Reduced system capacity Very high neutral currents Low Power Factor
29 Electrical Distribution System 64kV Utility Feed Typical Plant Loads Buss Duct DC Drives VFD s Outlets 480V/277V Xformer Motors Lighting 13.2kV/480V Dist. Xformer 2000A 3 Switchgear UPS s PC s MDP 400A 208V/120V HVAC Robotics Induction Furnace ARC Welder VFD s Typical Office Loads
30 Terms & Definitions Sinusoidal Wave Forms Power Quality Electrical Loads Types Harmonics RMS
31 What is RMS? (Root Mean Square) & Why is it Important?
32 Definition of RMS Values (rms means root mean square) Q I ( rms ) = I 2 n n= 1 I I 2 I 2 I 2... I ( rms ) = w n I ( rms ) = = 93 amps
33 Why is RMS Important? The importance of RMS voltage and current are that they can be directly used to calculate the total or true power.
34 Single-Phase 2-pulse Diode Bridge (Schematic Diagram) + _
35 Single-Phase 2-Pulse Diode Bridge (Waveform) Voltage Current WAVE ANGLE IN DEGREES
36 Single-Phase 2-Pulse Rectifier (Typical for Personal Computers) CURRENT % FUNDAMENTAL HARMONIC NUMBER
37 Electrical Distribution System 64kV Utility Feed Typical Plant Loads Buss Duct DC Drives VFD s Outlets 480V/277V Xformer Motors Lighting 13.2kV/480V Dist. Xformer 2000A 3 Switchgear UPS s PC s MDP 400A 208V/120V HVAC Robotics Induction Furnace ARC Welder VFD s Typical Office Loads
38 Three Phase Variable Frequency Drive (VFD)
39 Three-Phase 6-Pulse Diode Bridge (Schematic Diagram) + _
40 Electrical Distribution System 64kV Utility Feed Typical Plant Loads Buss Duct DC Drives VFD s Outlets 480V/277V Xformer Motors Lighting 13.2kV/480V Dist. Xformer 2000A 3 Switchgear UPS s PC s MDP 400A 208V/120V HVAC Robotics Induction Furnace ARC Welder VFD s Typical Office Loads
41 6-Pulse Diode Bridge Rectifier Harmonic Current Spectrum (Half & Full Speed Operation) CURRENT % FUNDAMENTAL HARMONIC NUMBER HALF LOAD FULL LOAD
42 Unloaded
43 Fully Loaded
44 7 th Harmonic Current Distortion (420Hz)
45 Terms & Definitions Sinusoidal Wave Forms Power Quality Electrical Loads Types Harmonics RMS Power Factor
46 Utility Billing Parameters kw kwh kva kvar kvarh PF Thousand Watts Thousand Watt hours Thousand Volt Amps Thousand Volt Amps Reactive Thousand Volt Amps Reactive Hours* Power Factor * No unit cost typically associated with this parameter. Used by utility to calculate PF.
47 kw Kilowatts Working power (kw) to perform the actual work of creating light, heat, torque, etc. Measured on a wattmeter in kilowatts. kw (Watts) Working power
48 kwh Kilowatt-Hour Number of actual watts times the hours they do work
49 kvar Kilo-Volt Amperes Reactive Power required to sustain the magnetic field of an inductive load. Performs no useful work Circulates between the power supply and the load Measured by the utility as kvar demand Reactive Power
50 Power Factor Triangle Working Power in watts Reactive Power in kvar
51 kva Kilovolt-Amperes (Supplied Power) Supplied Power (kva) is made up of working power (kw) and reactive power (kvar). Measured in kilovolt-amperes (kva) Working Power Supplied Power Reactive Power
52
53 POWER FACTOR θ kw (Working Power) kva (Total Supplied Power) kvar (Reactive Power) Power Factor = kw (working power) kva (total supplied power)
54 How Poor Power Factor Relates to Wasted System Capacity Working Power (kw) Wasted System Capacity Supplied Power (kva) Reactive power (kvar)
55 Simply Put! Poor Power Factor means more current is flowing through the electrical distribution system than is necessary to do the required work.
56 Line Loss (I 2 R) = Watt Loss Working Power (kw) Wasted System Capacity Supplied Power (kva) Reactive power (kvar)
57 Total Power Factor with Harmonics kw 60 kva rms kvar 60 kva 60 DISPLACEMENT PF = kw 60 kva 60 = 0.87 TOTAL PF = kw 60 kva rms = 0.77 Harmonic Content
58 Poor Power Quality & Poor Power Factor Putting it all together
59 Unloaded Electrical System, Perhaps Your Transformer Capacity 1000 kva Total System Capacity
60 Poor Power Quality Low PF No Available System Capacity Poor PQ & Low PF No Available System Capacity (kw) Total System Capacity
61 Good Power Quality High Power Factor More Available System Capacity Good PQ & High PF More Available System Capacity (kw) Total System Capacity
62 How efficient is your system?
63 You can t control what you don t measure!
64 You can t capture ($ s) if you don t invest in expertise and equipment that pays you back!
65 Applied Technologies
66 Basic Steps Toward Improving Electrical Efficiency 12 Months Billing History Power & Energy Study Determine Load Ratio Power Quality Assessment Evaluate Data & Information Design a Comprehensive Strategy Select Appropriate Technology/Operational Adj. Life Cycle Cost Analysis Submit a Project Appropriation Request
67 Thank You! Phone : Fax : Web : cpigroupltd.com br@cpigroupltd.com
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