当故障导致供电系统与外电网断开后，此时供电系统因有功不平衡，将出现频率崩溃现象，导致大面积停电事故。
When disconnected with external power grid due to certain fault, it will result in frequency collapse, and even leads to large-scale blackout owing to the active power imbalance.
另外，大用户还可向执行保险人职能的电网公司购买备用容量，以便及时代替发生停电事故的合同发电商来供电。
Big customers can take out insurance policies for the loss caused by power supply interruption in order to ensure power quality and reduce the risk of power supply interruption.
前者能够有效地提高配电网的供电安全性，在较大程度上增强系统对负荷波动的承受能力和对偶然事故的应变能力；
The former improves the power supply security of distribution networks efficiently, strengthens the capability in treating occasional faults of the systems.
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