Power System Studies


National Field Services performs a variety of power system studies, including short circuit studies, protective device coordination studies and arc flash studies. All of our power system services are designed to maximize power quality, improve power system performance and reliability, and increase personnel safety. Our extensive experience in the electrical power distribution industry, in combination with the latest engineering software, produces electrical engineering documentation of the highest quality.


National Field Services performs engineering and power system studies applicable to a broad range of industries including primary metals, pulp and paper, petrochemical, cement, electronics, water treatment, and data processing centers.


Our team of expert engineers utilizes the industry’s most popular electrical engineering software, SKM Power Tools. This, along with our years of experience in power system testing and maintenance, enables us to provide power system studies you can place complete confidence in.


With a National Field Services Power System Study, you can achieve:

  • Reduced Operating Costs
  • Improved Efficiency
  • Increased Availability
  • Increased Personnel Safety
  • Improved Reliability



Short Circuit Study

A short circuit study can help minimize the consequences of a potential fault in your power system by helping identify the ideal short circuit ratings for your switchgear. For example, short circuit interrupting equipment such as circuit breakers and fuses should have ratings greater than the short circuit duties calculated by the study.


When ratings for your power system are too low, equipment may fail to interrupt a short circuit or ground fault. This leads to more widespread effects throughout your electrical power distribution system as more switchgear fail.


National Field Services’ short circuit study calculation procedures are in accordance with ANSI and IEC 60909. Short circuit calculations are also useful when meeting NEC requirements that short circuit interrupting devices have capabilities in excess of the duties imposed on the devices by the system.


Protective Device Coordination Study

A Protective Device Coordination Study recommends settings for adjustable protective devices, which minimize disturbances due to system faults. These devices include switchgear, protective relays, and circuit breaker trip devices, all of which can provide automatic tripping during disturbances.


Recommendations may also be made for revising the type of protective device that is applied. The prime consideration of a coordination study is minimizing the part of the system that is disconnected to remove a fault of abnormal condition. This permits continued operation for the greatest possible remainder of the power system.


Study results are also used to specify protective relays and circuit breaker trip settings, and for establishing impedances of current limiting reactors.


Arc Flash Study

An arc flash study helps reduce the risk of serious personnel injury and death in the event of an arc flash. It requires making sure that proper safety precautions are taken and adequate personal safety equipment (PPE) is worn according to NFPA 70E, IEEE 1584, NEC 110.6, and OSHA standards. An arc flash study calculates the incident energy and arc flash boundary for any point in a power system. Custom flash labels are generated that comply with NEC 110.16 requirements helping to further ensure a safe and productive workplace.


National Field Services’ arc flash study will identify approach boundaries and appropriate levels of PPE for employees. Each study is presented in a clear, tabular format in accordance with all major standards.


Benefits of an Arc Flash Study Include:

  • A written report of findings and recommendations including methods to reduce Arc Flash incident energy levels and enhance worker safety.
  • PPE category recommendations for all electrical equipment within the scope of the study.
  • Arc Flash incident energy equipment labels listing PPE category recommendations for attachment to existing enclosures.
  • NFPA 70E onsite electrical safety training for company personnel.



One-Line Updates

In addition to the power system studies mentioned above, another valuable way to maximize your electrical investment is through documentation updates. By making sure your plant electrical one-line drawings are up-to-date, downtime can be significantly reduced through decreased troubleshooting time and potential problems can be readily identified before they cause downtime.


Additionally, you provide increased personnel safety by providing improved system knowledge. Updated documentation, together with the power system study, provides a safer and more efficient working power system.

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National Field Services | 651 Franklin Street | Lewisville, TX 75057 | 800-300-0157 | 972-420-0157 local | 972-420-0552 fax