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首页> 外文会议>Electrical Insulation Conference and Electrical Manufacturing Expo, 2005. Proceedings >A comparison between partial discharge propagation in multiple-/spl alpha/ and single-/spl alpha/ transformer winding
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A comparison between partial discharge propagation in multiple-/spl alpha/ and single-/spl alpha/ transformer winding

机译：多重/ spl alpha /和单/ spl alpha /变压器绕组中局部放电传播的比较

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摘要

Power transformers are in service in different environmental, electrical and mechanical conditions. Many experiences have proved that the inner insulation system degradation may pose the transformer to fail while in service. On the other hand, partial discharges (PD) are recognized as the main cause of insulation deterioration process. Therefore, reaching the optimum inner insulation system is one of the challenges a transformer designer is faced with. The solution lies in the correct and accurate modelling of different types of transformer windings. Transformer strength especially during transient conditions is a criterion for transformer insulation designers. This challenge has made designers switch from ordinary layer and disc windings to multiple-/spl alpha/ windings. Multiple-/spl alpha/ windings have more complicated structure and comprise various parts with different physical structure and electrical characteristic. These kinds of windings have usually more wire length. These characteristics make partial discharge measurements be more hassling. Partial discharges that take place inside the winding propagate along the winding to reach the measuring terminals. Typical partial discharge signals cover a wide frequency range from DC up to hundreds of MHz and different frequency components propagate through the winding depending upon the winding structure in different modes. In this paper a comparison has been made between the results gained when the winding is single-/spl alpha/ and those of multiple-/spl alpha/. A 66 kV/25 MVA interleaved winding, which has 19 fully interleaved discs plays the role of a single-/spl alpha/ winding. When this main winding is connected to the tap winding with different structure and magnitude response, a multiple-/spl alpha/ winding is constructed. In the experimental measurements in the laboratory, the line and neutral-end current signals are detected by two home-made high frequency current transformers (HF-CT) and recorded with a 500 MHz digital oscilloscope. Home-made sensors are designed to provide maximum sensitivity in the desired frequency range.
机译：电力变压器可在不同的环境，电气和机械条件下使用。许多经验证明，内部绝缘系统的性能下降可能会导致变压器在使用过程中发生故障。另一方面，局部放电（PD）被认为是绝缘劣化过程的主要原因。因此，实现最佳的内部绝缘系统是变压器设计人员面临的挑战之一。解决方案在于对不同类型的变压器绕组进行正确而准确的建模。变压器强度，特别是在瞬态条件下的强度，是变压器绝缘设计人员的标准。这一挑战已使设计人员从普通层和盘式绕组切换到多重/ spl alpha /绕组。多个/ spl alpha /绕组的结构更复杂，并包含具有不同物理结构和电气特性的各个部分。这些绕组通常具有更长的导线长度。这些特性使局部放电测量更加麻烦。绕组内部发生的局部放电沿着绕组传播，到达测量端子。典型的局部放电信号覆盖从DC到数百MHz的较宽频率范围，并且取决于绕组结构的不同模式，不同的频率分量会通过绕组传播。在本文中，对绕组为单-/ spl alpha /时和多// spl alpha /时的结果进行了比较。 66 kV / 25 MVA交错绕组，具有19个完全交错的圆盘，起着单/ spl alpha /绕组的作用。当此主绕组连接到具有不同结构和幅值响应的抽头绕组时，就构成了一个多重/ spl alpha /绕组。在实验室的实验测量中，通过两个国产高频电流互感器（HF-CT）检测线路和中性端电流信号，并用500 MHz数字示波器记录下来。自制传感器旨在在所需的频率范围内提供最大的灵敏度。

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