Dyn11型配变单相感应加压局放试验接线方式探讨

Discussion on Connection Mode of Single Phase Induced Voltage Increasing Partial Discharge Test of Dyn11 Type Distribution Transformer

为提高Dyn11型配电变压器绝缘试验水平,对该类型配电变压器单相感应加压局部放电试验的接线方式进行探讨。经分析,得出低压侧单相加压、高压侧两相接地以及低压侧单相加压、高压侧单相接地这两种接线方式下,配电变压器各相高压绕组承受的电压及各铁心柱中磁通分布情况。基于这两种接线方式存在的弊端,提出了更为合理的接线方式。所提出的接线方式减少了感应耐压试验加压次数,提高了工作效率。

In order to improve the insulation test level of Dyn11 type distribution transformer, connection modes of single phase induced voltage increasing partial discharge test of such type distribution transformers are discussed. By analysis, the withstanding voltages of every phase high voltage windings and the flux distributions of every iron core limbs are obtained under two connection modes including the voltage increasing at the single phase of low voltage side with two-phase grounding at high voltage side and the voltage increasing at the single phase of low voltage side with single phase grounding at high voltage side. More reasonable connection mode is proposed based on disadvantages existed in the two connection modes. The proposed connection mode reduces the times of voltage increasing in the induced withstanding voltage test which improves working efficiency.