Arc Flash Hazards

Power System Studies are an important part of a facilities design, operation and maintenance program. The following system studies are the most important for safe and reliable operation of your facility.
EDA can perform any or all the services listed below using SKM Power Tools Electrical software

Engineering Software:

• Arc Flash Hazard Analysis Study
• Short Circuit Study
• Coordination Study
• Motor Starting Study

Arc Flash Hazard Analysis Study An Arc Flash is a type of electrical explosion or discharge between a phase bar and another phase bar, neutral or ground. This event can release large amounts of energy and result in temperatures as high as 35,000 degrees Fahrenheit. The extreme temperature can cause severe burn injuries or death to workers in the area.
An Arc Flash Study is required in order to determine the available arc fault currents and hazards. Once the potential energy levels are identified, proper personal protective equipment (PPE) and work practices can be established to keep all individuals safe.

Short Circuit Study A Short Circuit Study determines the available fault current at various locations throughout the electrical system and compares this value to the equipment maximum fault current rating. When the equipment is underrated for the fault current, there is a risk that it will not function properly when it is subjected to the extreme forces during a short circuit. Underrated equipment can also rupture and cause severe injuries.
Performing a Short Circuit Study before purchasing electrical equipment will save money and production downtime by not having to replace components later.

Coordination Study A Coordination Study is performed in order to improve the electrical systems reliability and limit the extent of power outages. For example, a failed 25hp motor should only open the breaker for that motor. If the electrical system is coordinated improperly it will open another protective device upstream, causing an unnecessary blackout resulting in loss of production and affect the locations safety.
EDA documents and provides Time Current Curves (TCCs) for all critical protective devices in the electrical system. If potential improvements can be made, new TCCs will be generated and provided for implementation. 

Motor Starting Study A Motor Starting Study is required on electrical systems where operating large motors can have unwanted consequences on its performance and affecting surrounding equipment. Starting an AC motor results in a current spike of several times the normal full load current. This spike can result in the following problems for the electrical system.

• Nuisance tripping of protective devices
• Drop in motor terminal voltages
• Triggering of Under voltage relays
• Stalling of running motors connected to the electrical system
• Excessive starting currents that damage the motors windings
• Equipment damage of heaters, power supplies and other electrical gear

EDA will analyze your electrical distribution system and help determine the best way to start large motors and protect your large investments.

Options for Motor Starting includes:

• Across the line starting
• Auto Transformers
• Soft Starters
• Star Delta Starters
• Variable Frequency Drives (VFDs)