Core Services

Short Circuit Study

The Short-Circuit Study assures fault tolerant designs and renovations for electrical power systems. This study includes operating scenarios to determine short-circuit under normal and alternate power conditions, including emergency and maintenance modes of operation.

Arc Flash Study

The Arc Flash Study determines the incident energy and arc flash boundary for each location in a power system. The short-circuit study results provide input data calculate the arcing fault current.

Equipment Evaluation

The Equipment Evaluation compares the short circuit current rating (SCCR) of the protective devices to the available fault current at each panel bus in the electrical system. The Equipment Evaluation is essential to determine if the breakers are rated to operate safely to interrupt and isolate fault currents with minimal disruption to the overall system.

Protective Device Coordination

A comprehensive Coordination-Study assures the proper selection and installation of overcurrent protective devices and settings to detect and clear a range of overcurrent and short-circuit currents.Graphical Time Current Characteristic (TCC) Curves are used to determine the optimum settings and coordination between protective devices.

Short Circuit Study

The Short-Circuit Study assures fault tolerant designs and renovations for electrical power systems. Using the source contribution from the utility company, the available fault current is calculated at main service entrance and for each bus in the system. The results are used in the Equipment Evaluation to evaluate the circuit breakers, panelboards and switchgear equipment assemblies, and to coordinate the protective devices.  The short-circuit current ratings (SCCR) for each piece of equipment is compared to the available fault current to determine if the protective devices in the system are rated to safely interrupt and isolate fault currents with minimal disruption to the overall system. The study includes operating scenarios to determine short-circuit under normal and alternate power conditions, including emergency and maintenance modes of operation.

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Equipment Evaluation

The Equipment Evaluation compares the short circuit current rating (SCCR) of the protective devices to the available fault current at each panel bus in the electrical system.  The interrupting rating of breakers must be greater than the calculated fault current available at the equipment location in order to pass the equipment evaluation process. When the criteria limits are met the breaker evaluation status is set to “pass”. However when the limits are exceeded the status is set to “fail” and these devices are considered to be over-dutied.  The over-dutied breakers are tabulated in the equipment evaluation section of the report for corrective action. The Equipment Evaluation is essential to determine if the breakers are rated to operate safely to interrupt and isolate fault currents with minimal disruption to the overall system. Operating scenarios are simulated to evaluate the equipment under normal and alternate power modes, including emergency and maintenance operations.

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Protective Device Coordination

A comprehensive Coordination-Study assures the proper selection and installation of overcurrent protective devices and settings to detect and clear a range of overcurrent and short-circuit currents. The device trip functions are set to sequentially operate with other protective devices to isolate and clear faults with minimum power disruption to other parts of the system. Graphical Time Current Characteristic (TCC) Curves are used to determine the optimum settings and coordination between protective devices. Each TCC curve includes as small section of the riser diagram to identify where the protective devices are located in the electrical system. The TCC Curves are also used to identify areas where the system is exposed to potentially damaging fault currents and to assure system protection.

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Arc Flash Study

The Arc Flash Study determines the incident energy and arc flash boundary for each location in a power system. The short-circuit study results provide input data calculate the arcing fault current. Based on the protective device settings and clearing time, the Incident energy and arc flash boundaries are calculated in accordance with the NFPA 70E and IEEE 1584 standards Custom Labels that display the Incident energy, Flash Protection Boundary, and PPE Clothing Category are provided for switchgear and panelboards throughout the system. These labels are generated from the SKM Power Tools for Windows Software and can be customized to include additional items featured in the client’s electrical safety requirements.  For accurate results, the data collection survey must reflect the as-built conditions as close as possible. The arc flash study should also consider all operating scenarios including normal utility power and backup power from generators, open and closed transition switching modes, and with or without motor contribution to simulate maintenance conditions.

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