Power System Fault Study Tool
This is a browser-based symmetrical-component fault calculator. It computes fault currents and sequence components for common fault types using positive, negative, and zero sequence networks. You enter source and line impedances and choose a fault type and location, and the tool solves for the resulting phase and sequence quantities.
Who it is for
It is built for protection and system engineers who need quick fault-level checks, and for students learning how symmetrical components describe unbalanced faults.
Inputs and outputs
- Inputs: source and line impedances, fault type, and fault location.
- Outputs: fault currents and symmetrical (sequence) components.
Typical use cases
- Generating fault current inputs for protection settings checks.
- Running quick fault-level checks during system review.
- Learning how the symmetrical-component method works.
What it does not do
It is not a full short-circuit study package. It does not replace IEC 60909 or utility short-circuit software, and it does not replace a stamped engineering study or engineering judgment.
Privacy: This tool runs entirely in your browser. Inputs you enter are processed locally on your computer and are not uploaded to a server.
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Frequently asked questions
- What is a symmetrical-component fault study?
- It is a method that decomposes an unbalanced fault into positive, negative, and zero sequence networks, then combines them to compute the phase and sequence fault currents and voltages at the fault location.
- What fault types are supported?
- Common fault types including three-phase, phase-to-phase, and single-phase-to-ground faults computed from the sequence networks.
- What inputs does it need?
- Source and line impedances along with the fault type and fault location. From these it builds the sequence networks and solves for the fault quantities.
- Does this replace a full short-circuit study?
- No. It is a calculation and learning aid, not a full short-circuit study package. It does not replace IEC 60909 or utility short-circuit software, and it does not replace a stamped engineering study.
- Is my data uploaded?
- No. The tool runs entirely in your browser and your inputs are processed locally on your computer and are not uploaded to a server.
- How does this support protection settings?
- It provides fault current and sequence component magnitudes that can be used as inputs when checking and validating overcurrent, directional, and distance protection settings.