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7. Typical malfunctions
7.1 Incorrect zero-sequence settings on current-operated protection devices
When the underground network expands and we "forget" to take into account the new value of the capacitive current of the feeder to be protected, the condition I setting > 1.2 × 3I c may no longer be met.
The protection opens its circuit-breaker unexpectedly when a low-resistance single-phase fault occurs on...
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Typical malfunctions
Bibliography
- (1) - WILLHEM (R.), WATERS (M.) - Neutral grounding in high voltage transmission. - Elsevier publishing company.
Also in our database
Standards and norms
- Technical decree – Technical requirements for electrical power distribution - UTE C11-001 -
- Postes de livraison établis à l'intérieur d'un bâtiment et alimentés par un réseau de distribution publique HTA (jusqu'à 33 kV) - NF C13-100 -
- Effects of current on humans and pets – Part 1: General aspects - CEI 60479-1 -
- Effects of current on humans and pets – Part 5: Contact voltage threshold values...
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