PRONY method can get the damping ratio of transient signals which can be used to predict and detect the early back corona failure efficiently, and this method makes up the deficiencies of ESP volt-ampere curve.

• 同样，PRONY方法抽取出的ESP瞬态信号的阻尼因子可以有效的区分出两种容易混淆的ESP故障一ESP反电晕故障和ESP极间距变小故障，弥补了原有的判断ESP极间距变小故障方法的不足，是诊断ESP极间距变小故障方法的发展;