Dielectric Response Analysis of Mineral Oil Immersed Transformer Insulation during Manufacturing Process

被引:0
|
作者
Nganpitak, Tritod [1 ]
Nimsanong, Phethai [1 ]
Maneerot, Sakda [1 ]
Pattanadech, Norasage [1 ]
机构
[1] King Mongkuts Inst Technol Ladkrabang, Fac Engn, Elect Engn Dept, Bangkok, Thailand
来源
2019 IEEE 20TH INTERNATIONAL CONFERENCE ON DIELECTRIC LIQUIDS (ICDL) | 2019年
关键词
mineral oil; oil-paper insulation; polarization current; depolarization current; dielectric response analysis;
D O I
10.1109/icdl.2019.8796642
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Polarization and Depolarization current (PDC) method is one of non-destructive insulation testing methods that can be used for diagnosis the insulation conditions of high voltage equipment. This paper presents the PDC analysis of an oil immersed distribution transformer measured during the manufacturing process. A 22 kV, 30 kVA single phase transformer was designed and constructed. During manufacturing process, the polarization current and depolarization current of the transformer insulation were measured for 6 case studies as follows: 1) paper insulation between iron core and low voltage (LV) windings before dry and vacuum in the oven, 2) paper insulation between LV and high voltage (HV) windings before dry and vacuum in the oven, 3) paper insulation between iron core and LV windings after dry and vacuum in the oven, 4) paper insulation between LV and HV windings after dry and vacuum in the oven, 5) oil-paper insulation between iron core and LV windings after dry and impregnation process and 6) oil-paper insulation between LV and HV windings after dry and impregnation process. Then, PDC test results were analyzed. It was found that the moisture content in the paper insulation clearly affected the capacitance at power frequency, and PDC shapes. Besides, the impregnation process had a good effect on the capacitance ratio and dielectric dissipation factor. Moreover, the current difference of dry paper insulation between HV and LV windings presented the nonlinear characteristic both before and after impregnation process.
引用
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页数:4
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