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Related Concept Videos

Fault Types01:18

Fault Types

88
When analyzing a single line-to-ground fault from phase A to ground at a three-phase bus, it is important to consider the fault impedance. This impedance is zero for a bolted fault, equal to the arc impedance for an arcing fault, and represents the total fault impedance for a transmission-line insulator flashover. To derive sequence and phase currents, fault conditions are translated from the phase domain to the sequence domain.
For line-to-line faults occurring between phases B and C, the...
88
Design Example: Automobile Ignition System01:14

Design Example: Automobile Ignition System

231
The automobile's ignition system plays a vital role by ensuring the timely ignition of the fuel-air mixture in each cylinder. This ignition is facilitated by a spark plug, which is composed of two electrodes separated by an air gap. A spark forms across this air gap when a substantial voltage is generated between the electrodes, leading to the ignition of the fuel.
One can generate a large voltage using a car battery of 12 volts with the help of inductors. Inductors are known for opposing...
231
Power System Three-Phase Short Circuits01:21

Power System Three-Phase Short Circuits

85
Determining the subtransient fault current in a power system involves representing transformers by their leakage reactances, transmission lines by their equivalent series reactances, and synchronous machines as constant voltage sources behind their subtransient reactances. In this analysis, certain elements are excluded, such as winding resistances, series resistances, shunt admittances, delta-Y phase shifts, armature resistance, saturation, saliency, non-rotating impedance loads, and small...
85
Bus Impedance Matrix01:24

Bus Impedance Matrix

120
Calculating subtransient fault currents for three-phase faults in an N-bus power system involves using the positive-sequence network. When a three-phase short circuit occurs at a specific bus, the analysis uses the superposition method to evaluate two separate circuits.
In the first circuit, all machine voltage sources are short-circuited, leaving only the prefault voltage source at the fault location. The positive-sequence bus impedance matrix can be determined by solving the nodal equations,...
120
Circuit Breaker and Fuse Selection01:23

Circuit Breaker and Fuse Selection

104
A circuit breaker is a device engineered to interrupt fault currents and sometimes reclose automatically. When a fault current is detected, the breaker separates the electrical contacts, which generates an arc. This arc is extinguished by methods such as elongation, cooling, or splitting, depending on the breaker's design. Breakers are categorized based on the voltage they operate at and the medium used for arc extinction, such as air, oil, SF6 gas, or vacuum.
In high-voltage systems,...
104
Fast Decoupled and DC Powerflow01:24

Fast Decoupled and DC Powerflow

192
The fast decoupled power flow method addresses contingencies in power system operations, such as generator outages or transmission line failures. This method provides quick power flow solutions, essential for real-time system adjustments. Fast decoupled power flow algorithms simplify the Jacobian matrix by neglecting certain elements, leading to two sets of decoupled equations:
192

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Electric vehicle fire risk assessment framework using Fault Tree Analysis.

Mohd Zahirasri Mohd Tohir1,2, César Martín-Gómez1

  • 1Department of Construction, Building Services and Structures, Universidad de Navarra, Pamplona, Navarre, Spain.

Open Research Europe
|February 19, 2024
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Electric vehicle (EV) fires pose a growing risk. This study uses Fault Tree Analysis (FTA) to assess EV fire causes and frequencies, providing critical data for safety strategies.

Keywords:
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Area of Science:

  • Electrical Engineering
  • Fire Safety Science
  • Risk Assessment

Background:

  • Rising electric vehicle (EV) adoption presents new fire safety challenges.
  • Media attention on EV fires highlights the need for robust risk assessment.
  • Environmental concerns drive EV adoption, necessitating proactive safety measures.

Purpose of the Study:

  • To develop a framework for assessing fire risks in electric vehicles (EVs).
  • To identify and analyze the primary causes of EV fires.
  • To establish a quantifiable metric for EV fire frequency.

Main Methods:

  • Utilized Fault Tree Analysis (FTA) for a qualitative exploration of EV fire causes.
  • Integrated diverse data sources into a unified dataset for comprehensive analysis.
  • Employed a weighted average approach to calculate annual EV fire frequency per country.

Main Results:

  • Identified five main categories of EV fire causes: human, vehicle, management, external, and unknown factors.
  • Determined an average annual EV fire rate of 2.44 × 10-4 fires per registered EV.
  • Highlighted data quality and reporting discrepancies as areas requiring further research.

Conclusions:

  • Emphasizes the need for data-driven insights and adaptive strategies for EV fire risk management.
  • Provides crucial information for first responders dealing with EV fire incidents.
  • Establishes a foundation for future EV safety measures and policy development.