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首页> 外文会议>9th Power Systems Protection amp; Control Conference >A novel flux-based protection scheme for power transformers
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A novel flux-based protection scheme for power transformers

机译：一种新颖的基于磁通的电力变压器保护方案

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摘要

Power transformers as an important and expensive apparatus in the power system must be protected against the faults and should be monitored permanently to increase power system reliability and to decrease maintenance costs. Internal Turn-Turn faults (TTF) are the most common failures in power transformers, which could seriously reduce the useful long life of these equipment. Although the common protection schemes such as differential relays are able to detect some of internal faults, some other ones (such as TTFs and short circuit near the neutral point) cannot be detected by them. Also, these relays may trip erroneously due to energizing inrush currents, transformer over excitation, and occurring CT saturation at one side. In this paper a novel Linkage Flux Based (LFB) scheme is proposed to detect TTF in power transforms, which uses some Search Coils (SC) located on the transformer legs to sense the related linkage flux. Any difference in induced voltage in the corresponding SCs (located in any leg) suggests passing unsymmetrical linkage fluxes through them (against the normal conditions), which stands for occurrence a fault inside the transformer. The proposed technique not only can be used to protect power transformers, but also can be employed to find the fault location during repair activities, as well.
机译：电力变压器是电力系统中重要且昂贵的设备，必须加以保护以防止故障，并应对其进行永久监控，以提高电力系统的可靠性并降低维护成本。内部匝间故障（TTF）是电力变压器中最常见的故障，可能会严重缩短这些设备的使用寿命。尽管常见的保护方案（例如差动继电器）能够检测到一些内部故障，但它们无法检测到其他一些故障（例如TTF和中性点附近的短路）。同样，由于激励浪涌电流，变压器过励磁以及一侧出现CT饱和，这些继电器可能会错误跳闸。本文提出了一种新颖的基于联动通量（LFB）的方案来检测功率变换中的TTF，该方案使用位于变压器腿上的一些搜索线圈（SC）来感应相关联动通量。相应SC（位于任何支路上）中感应电压的任何差异都表明（不正常情况下）使不对称的链接磁通通过它们（这代表正常情况）。所提出的技术不仅可以用于保护电力变压器，而且还可以用于在维修活动中查找故障位置。

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