Desktop Arc Flash Study - 415V to 11KV Switchboard Arc Flash Engineering Analysis

arc flash desktop_imac2013_right.png
arc flash desktop_imac2013_right.png

Desktop Arc Flash Study - 415V to 11KV Switchboard Arc Flash Engineering Analysis

2,500.00 2,777.00
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Scope of Services

As part of this scope we have only allowed for a desktop study and the client is required to provide the following information. 

  • Energy Authority fault contribution and protection grading curve.
  • Switchboard voltage, current rating and fault current rating and circuit breaker protections settngs.
  • Supply cable cross-sectional area and length (e.g. 4x1c 120mmsq over 40 meters).
  • large motor loads.

The above information is not required to order, and we can assist you in finding this information if requited. However we have not allowed to got to site.

As part of the Arc Flash Study we use a software model of the power system using SKM Power Tools Software Suite. The software models and calculates power system fault currents, protection settings, and protection coordination for different system configurations. The completed model allows the software to perform the arc flash calculations.

As an overview, to perform arc flash calculations, the following steps are completed:

  • Determine the system modes of operation e.g. parallel feeders.
  • Calculate 3-phase bolted fault levels at each switchboard of interest using IEC 60909 or AS3851.
  • Calculate the arc-currents using IEEE 1584.
  • Find the protective device characteristics and the duration of arcs. The existing protection settings can be obtained from the power supply protection settings database. Where there are no records of protection settings, the settings should be retrieved directly from the relays.
  • Determine system voltages and classes of equipment.
  • Select the working distance.
  • Determine, from calculated arcing currents, the incident energy at working distance.
  • Calculate arc flash boundaries.
  • Document calculations and produce labels to be placed on the switchgear doors.