Krypton is a risk assessment tool developed as part of my Capstone project for my B.A.Sc. degree in Electrical Engineering at UBC. This project is based upon IEEE 80-2013 [1] and IEC-60479 [2] industry electrical standards in North America and designed to mimic Argonium [3].

Krypton calculates the probability of fibrillation for a given set of parameters to simulate a ground fault scenario at a high voltage transmission line. This tool is developed for BC Hydro and is designed for their specific needs.

The tool is written in JavaScript (with JQuery) and styled with Bootstrap elements following the BC Hydro style guidelines. Dynamic graphs are generated using ChartJS.

[1] 80-2013 - IEEE Guide for Safety in AC Substation Grounding. IEEE., 2015.

[2] Energy Networks Association Limited, EG-0 Power System Earthing Guide Part 1: Management Principles. Barton, ACT, 2010.

[3] “Quantitative Risk Assessment for Earthing,” Argonium. [Online]. Available: https://argonium.com.au/. [Accessed: 18-Oct-2019].

Special thanks to Prof. Hamed Ahmadi for his support throughout the project!

Krypton is a risk assessment tool based upon industry standards, IEEE-80 [1] and IEC-479 [2], similar to the currently used Argonium [3] application developed by Energy Networks Australia.

For the *individual* case, we define coincidence as the following two events:

- Contact is established during the presence of a fault
- A fault occurs during contact

We calculate the probability of coincidence separately for the case of step voltage versus touch voltage. In a step voltage scenario, we assume the individual is present at the target location for a “gathering” and consider only the fault parameters and the gathering parameters. In a touch voltage scenario, we assume the individual is in contact with the faulted element and consider on the fault parameters and the contact parameters.

Ventricular fibrillation occurs probabilistically relative to the body current (or the fibrillation current). We derive an equivalent circuit modelling the step/touch voltage and the resistances of the path through the body and ground. The probability is based on an approximation through the logarithmic normal distribution and empirical mean/standard deviation values.

The probability of fatality can be calculated as the product of the probability of coincidence and the probability of fibrillation. The results section features:

- Probability of fibrillation value
- Risk classification
- Group coincidence curve
- Fibrillation curve

*Risk classification* is based upon the BC Hydro risk matrix and can be adjusted in the
settings.

*Group coincidence curve* shows the probability of coincidence for a given group size
and is overlayed with BC Hydro risk matrix thresholds calculated in conjunction with the
probability of fibrillation.

*Fibrillation curve* shows the probabilistic variation of ventricular fibrillation
relative to the body current for the specified fault duration (clearing time).

[1] 80-2013 - IEEE Guide for Safety in AC Substation Grounding. IEEE., 2015.

[2] Energy Networks Association Limited, EG-0 Power System Earthing Guide Part 1: Management Principles. Barton, ACT, 2010.

[3] “Quantitative Risk Assessment for Earthing,” Argonium. [Online]. Available: https://argonium.com.au/. [Accessed: 18-Oct-2019].

Developed by Lucy, Jenny, Leo, Marko, and Berk.

See user guide for detailed instructions.

No processed data.

Load Krypton template.

Save current inputs into Krypton template.

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