Fault current
Declare the standards inputs, source and radial network, then review the fault duties.
1 · Standards declaration
Voltage factor c per nominal system voltage IEC 60909-0:2016 Table 1
One declaration per nominal voltage in the chain. Required and empty by design: the engine computes nothing until each band's cmax and cmin are declared with their clause.
2 · Operating conditions
Hz
Minimum-case conductor temperature θe
°C
Temperature coefficient α per material, with its base temperature
1/K
°C
Thermal factors and KT Optional. Undeclared m and n mean Ith is not computed.
3 · Source
4 · Network chain
A result row is emitted at every element boundary; the terminal fault is at the last element. Ratings are optional per node: an unrated node is reported, never graded. Topology is a single radial chain fed by parallel sources at one node; a mesh is unrepresentable here, not approximated.
Results
Terminal fault duty, basis and limits first; per-node detail follows.
Detailed analysis Duties, per-node results, adequacy and assumptions
IEC 60909-0:2016
Document
Project record, calculation notes and references.
Calculation notes
- Every standards value on this document is engineer-declared with its clause — the instrument holds none of them.
- Maximum duty sizes the equipment; minimum duty is the number a protective device must still see at the far end of the run.
- Printed currents are symmetrical RMS with no decrement applied; each X/R is labelled by its own loop.
References
- Awaiting a complete declaration set.
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