In case of low voltage and heavy load, the relay loadability may replace the thermal loadability, leading to undesirable relay operation and cascading events.
低压重载系统中，保护载荷度可能取代热载荷度，导致保护不合理动作以及后续连锁过程。
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Of course, there is still many problems needed to be solved, but it is believed that the online transmission line loadability estimation will face a good prospect.
This paper demonstrates the use of line stability index termed as fast voltage stability index (FVSI) in order to determine the bus maximum loadability in a power system.