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The resulting decreased fault clearance time reduces the maximum dc fault current and consequently, leads to lower required ratings for HVDC grid equipment.
Generally speaking, the fault clearance time achieved by the protection system is very short, perhaps less than 1ms, to protect the main power devices from thermal overstress.
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The ARR of reporting problems on EQ-5D items was 1.20 1.35 times higher in the not at fault group.
Without fault clearance, although the fault current is reduced significantly at that time, it will exist for a long time and there is no zero-crossing point.
Computerised evaluations coupled with clearance time targets have led to significant statistical error.
At the same time in the 1990s, with the continuous expansion of the power network, the demand for fast fault clearance to improve system stability encouraged research into non-power system frequency fault detection techniques to increase the speed of the relay response.
To reduce the fault clearing time, this paper proposes two fast backup relaying algorithms which detect local and remote breaker failure before the expected primary fault clearance instant.
Backup relaying algorithms originally developed for ac systems delay the detection of primary protection failure until the expected primary fault clearance instant.
After the fault clearance, the voltage tends to recover.
Fig. 18 Remanence comparison of iron cores in CT after fault clearance.
Then the characteristics of eliminating remanence after fault clearance are compared.
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