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
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