Feb 9, 2023, 11:06 AM

Duration : 15:35

External URL : https://www.youtube.com/embed/1qjw83NapG8

How a failure, to properly perform protection studies, led to a significant substation safety incident and outage. ​Understanding minimum and maximum fault current values are critical in this case study. The shortcomings led to a fault not being removed fast enough.  Short circuit impedances are very valuable, it is critical to have the right cables and impedances of the equipment. An excellent learning from this case study is that line to line arc flash fault exists much longer at medium voltage level. In low voltage we do not see those type of line-to-line arc flash faults because line to line arc flash fault will rapidly turn into a three-phase fault. The arc flash calculator is a great tool to estimate incident energy.  The arc flash calculator shows both methods:  below 15 kv we can use IEEE 1584-2018 to calculate incident energy at 15 Kv, and above our fault calculated method can calculate calories exposure during the fault.

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• Case Study

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