191 / 2018-09-02 08:01:48

Practice & Statistics Analysis of 10kV XLPE Power Cable Aging Assessment in China Eastern

Statistical Analysis,10kV,XLPE,Cable Aging

ABSTRACT
In recent 3 years China ICEMPE field has adopted VLF TanDelta aging method in 6kV-35kV XLPE distribution cables. Most China case studies in 2012-2017 have found Chapter 5.4 of IEEE400.2-2013 international standard IEEE Guide for Field Testing of Shielded Power Cable Systems Using Very Low Frequency (VLF) (less than 1Hz) is not well fit for China 6kV-35kV XLPE distribution cables aging assessment, especially its criterion is too strict to China power cable asset practice because of (1) poor quality control during manufacturing & poor workmanship during cable laying and cable accessories installation in China most industries; (2) Table 4-Historical figures of merit for condition assessment of serviced-aged PE-based insulation using 0.1Hz in Chapter 5.4 IEEE400.2-2013 coming from western power utilities practice and historical data during 2001-2012, no local experience or data in China at that time. This paper presents measures & mathematical statistics analysis conclusion of VLF TanDelta Aging data on 60 circuits rated voltage 8.7/10kV XLPE power cable systems of State Grid in China JiangSu, ZheJiang, AnHui, and Shanghai provinces in 2018.
This paper is devoted to study more appropriate criteria of VLF 0.1Hz aging by VLF 0.1Hz TanDelta method for China XLPE distribution cable asset, from three dimensions (within IEEE400.2-2013 framework): time Stability, Differential TanDelta (1.5Uo-0.5Uo), and Mean VLF TanDelta. This paper also provided a further site verification for a drafted version of VLF TanDelta aging assessment code with water tree observation under microscope. This fact makes VLF TanDelta interesting for China power grid operators and VLF TanDelta measurement instruments producers.