High repulsive force value between contact members arising mostly at contact closure and/ or in transient under short circuit conditions is a real hazard for power contact switch. 真空断路器在动静触头闭合或电路短路的瞬时,接触单元之间经常产生很大的排斥力,对电力接触开关的危害极大。
However, transient flow in pipe network system will be caused when large users start to run or to close. The hazard made by transient flow can result in intensive breakage of pipeline. 然而,某些大用户开启或关闭都将导致管网系统中产生瞬变流现象,由瞬变流动而产生的水击压力波可能导致管段的强度破坏。