Seattle Office
16122 SE 266th Street
Covington, WA 98042
(253) 639-8535 P.
(253) 639-8685 F. Fuhr@PowerStudies.com
San Francisco Office
2400 Third Street
San Francisco, CA 94107
(415) 828-0529 Tran@PowerStudies.com
The following power system studies are available from PowerStudies.com:
One Line Diagram Revision/Generation We will construct a comprehensive and up-to-date power system one-line diagram using CAD drafting services. We will perform the equipment survey to acquire the data needed to do the study.
An updated one line diagram will:
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Allow for greater ease of on-site electrical system trouble shooting
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Reduce potential mismatches when adding on to an existing facility
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Provide the most up-to-date information for performing accurate power system studies
Protective Device Coordination Study We will determine settings for your protective devices (circuit breakers and relays) and determine ampacities for any fuses in the power system. These settings and ampacities will be determined by plotting the Time Current Curves of the devices and applying NEC, IEEE, ANSI and UL standards.
A protective device coordination study will:
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Increase equipment protection
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Ensure protective device coordination by setting the protective devices to trip in sequence.
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Increase facility reliability by limiting the effects of a disturbance (fault/overload) to smaller areas of the distribution system.
Short-Circuit Study We will calculate the short circuit fault current levels at different locations in the power system. We will compare these calculated fault currents to your equipment short circuit interrupt/withstand ratings in order to determine if you have a problem.
A short circuit study will:
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Identify underrated equipment before extensive system damage can occur
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Increase facility reliability, equipment protection and personnel safety
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Aid in future expansion plans by providing accurate fault current calculations at each location in the system, thereby allowing properly rated equipment to be specified.
Load Flow
We will calculate Kilowatts (KW), Kilovars (KVAR), Power Factor (PF), and voltage drops at various locations in the power system. We will determine how the system will operate in normal and emergency conditions. We will also check for the application of power factor correction capacitors.
A load flow study will:
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Reduce your electric bill by determining the location and size of power factor correction capacitors
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Aid in future planning and present day operation by demonstrating how the electrical system will perform during normal and emergency operating conditions
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Determine the proper transformer tap settings so that the correct voltage will be present at motors and other loads during full load and no load conditions
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Identify under-utilized equipment to which will allow for future load growth
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Identify overloaded equipment
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Increase the distribution system operating efficiency and determine the most optimum operating configuration
Motor Starting We will model and simulate the motors starting on your distribution system. We will calculate flicker and voltage drop due to motor inrush current. We will also determine the best method to start the motor with minimal impact to the rest of the distribution system.
A motor starting study will:
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Reduce voltage flicker or voltage drop problems in the facility
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Increase facility reliability
Harmonic Study
We will identify, monitor and measure harmonics generated by non-linear equipment. The study will determine if your facility exceeds the IEEE 519 Limits. We will determine harmonic mitigation techniques to reduce the harmonics. Examples of these are phase shifting, zig-zag transformers, and filter installation.
A harmonic study will:
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Identify the source of harmonics (internal or external to your facility)
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Evaluate the impact of non-linear loads (harmonic sources) on facility distribution systems
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Evaluate compliance with IEEE 519
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Verify proper size and placement of capacitors when harmonic sources are present
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Verify proper size, configuration and placement of filters, if necessary
Power Factor Study We will select the size and location of capacitors to improve power system efficiency and eliminate penalty charges.
A power factor study will:
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Reduce utility penalties
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Improve voltage profile by raising voltage
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Ensure proper sizing of capacitors
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Ensure proper placement of capacitors
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Verify that there will be no abnormal interaction between harmonic sources and the capacitors
Transient Analysis Study
We will quantify and locate the cause of damaging transients and identify solutions to minimize or eliminate them.
A transient analysis study will:
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Increase equipment protection by eliminating, reducing, or controlling the transients to a safe level
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Increase facility reliability
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Minimize mis-operation of protective devices and switching equipment
Arc Flash Hazard Study
We will calculate the short circuit fault current levels and protective device settings feeding switchboards, panelboards, industrial control panels, and motor control centers. We will calculate the following:
• Flash hazard boundary
• Amount of incident energy
• Shock hazard
• Limited approach
• Restricted approach
• Prohibited approach
• Type of Personnel Protective Equipment (PPE) needed
• We will provide colored custom stick-on labels for each location.
An arc flash hazard study will:
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Increase the awareness of flash hazards
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Increase facility reliability, equipment protection, and personnel safety
