中文摘要：

为了从提取的放电信息中了解放电的发展趋势及材料的绝缘状况,对已提取信号要进行分析处理。目前国内对于直流局部放电的分析无统一方法,大多仅限基于Q,n,t的Q-n,Q-t,n-t曲线等基本参数,但这些参数所蕴含的放电信息量较少,不能完全真实地反映介质内部局放的发展趋势及对绝缘介质的危害程度。为此,介绍了Delta（t）分析法,它是借鉴发展较成熟的交流局放分析法中的相位参量φ,将其影射成Δt参量（两次放电的时间间隔）。将该法应用于直流下带有缺陷的高压储能电容器局放信号的分析,得到了较好的分析结果,验证了Delta（t）法的有效性和可行性。

英文摘要：

The main aim of measuring partial discharge signals of insulation materials is to realize the development of partial discharge （PD） and insulation state of materials, so signal analysis is important. At present ,there are no uniform methods to analyze partial discharge under DC（direct current）, Commonly, the basic parameters of DCPD （partial discharge under direct current） are discharge magnitude Q, number of discharge n and time t where dis- charge occurs and some curves such as Q-n ,Q-t ,n-t. But they can not reflect the true development of PD and damage degree of insulation. So this paper introduces the Delta （t） method, the parameter At （interval between two partial discharge） corresponds to parameter φ under ACPD（partial discharge under alternating current） ,so the mature analytical method of ACPD can be referred. And its feasibility and validity is proved by applying it to analyze partial discharge signals of high voltage storage capacitor with defects under DC.