Fault Current Calculator

This calculator can be used to determine the symmetrical RMS fault current in an electrical power system based on system voltage and system impedance.

Input Parameters

Calculation Results

Calculation Formula

Fault Current (If) = V / Z

Where:
V = System Voltage (Volts)
Z = System Impedance (Ohms)

Fault Current Calculator Usage Guide

Learn how to use the Fault Current Calculator and its working principles

How to Use the Fault Current Calculator

  1. Enter the system voltage in volts (V) in the "System Voltage" field.
  2. Enter the system impedance in ohms (Ω) in the "System Impedance" field.
  3. Click the "Calculate" button to compute the fault current.
  4. The calculated fault current in amperes (A) will be displayed in the "Fault Current" field.
  5. If the input values are invalid or the impedance is zero, an error message will be displayed.

Working Principle

The fault current is calculated using Ohm's Law, which states that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (or impedance Z) of the conductor.

The formula used is: If = V / Z, where If is the fault current, V is the system voltage, and Z is the system impedance.

Applications

This calculator is useful for electrical engineers and technicians in power system design, fault analysis, and protective device coordination. It helps determine the level of fault current that may occur in a system, which is essential for selecting appropriate circuit breakers, fuses, and relays.