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1. Voltage restored in the event of a three-phase terminal fault
The restored voltage is calculated using the system of symmetrical direct, inverse and homopolar components (indices d, i and 0)
This method, published in 1918 by C.L. Fortescue, solves the problem of calculating current distribution in unbalanced polyphase networks.
It is also a relatively simple way of determining the restored voltage (or pole factor) when each pole of a circuit-breaker is disconnected. The TTR can then be deduced by multiplying the peak value of the restored voltage by the amplitude factor.
This calculation is detailed here because it is difficult to find the complete determination of pole factors (ratio between the voltage restored on a pole and the voltage between phase...
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Voltage restored in the event of a three-phase terminal fault
References
Reference documents
Standardization
International Electrotechnical Commission (IEC)
- (cf. CEI 62271-100). - CEI 60056 - 06-2001
- Rapport Technique : Guide d'application des normes de disjoncteurs à haute tension. - CEI XXX - 2001
- Technique des essais à haute tension. - CEI 60060-1 - 1989
- Coordination de l'isolement. - CEI 60071-1 - 11-1993
- Coordination de l'isolement. - CEI 60071-2 - 12-1996
- Sectionneurs à courant...
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