作为电力系统安全分析中的重要组成部分，偶然事故的选择由于在分析过程中加入了对事故发生率的考虑而变得更具有合理性。
As an essential part in the power system security analysis, the whole process of contingency selection becomes more sensible by taking the probability aspect into consideration.
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.
事故的发生具有偶然性、必然性和可预防性等特性，充分认识事故的这些特性对提高安全意识水平有重要的意义。
Accidents have characteristics of contingency, inevitability and preventability. Fully realization of these characteristics is of great significance in raising the level of safety awareness.
事故的发生具有偶然性、必然性和可预防性等特性，充分认识事故的这些特性对提高安全意识水平有重要的意义。
Accidents have characteristics of contingency, inevitability and preventability. Fully realization of these characteristics is of great significance in raising the level of safety awareness.
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