变压器接线分组，你了解多少？
变压器连接组，这是一种技术性很强的表示形式，用于描述变压器初级和次级绕组的组合接线形式。在电力系统中，它的重要性怎么强调都不为过。通常，普通变压器具有两种类型的连接: 高压侧的三角形和星形。三角连接方式具有结构紧凑、稳定性强的特点，适用于一些对电压稳定性要求较高的场合。星形连接方法在减少谐波干扰和改善电能质量方面非常出色。在低压侧，三角形或星形连接也可。这些连接彼此组合以形成各种布线形式。此外，由于高压侧和低压侧的电压之间存在一定的角度差，这进一步丰富了变压器的性能特点和应用场景。
In addition, there are two completely different ways to ground and not to ground the neutral point on the high and low voltage side. Neutral grounding can effectively improve the safety of the system and reduce the risk of electric shock. The non-grounding method plays a unique role in certain specific environments and needs.
It is these numerous factors that are intertwined and together form all the key elements of the transformer connection group. For example, the connection groups marked on the nameplates of transformers that we commonly use in our daily life and work, such as DYN11. So, what does this mean exactly? It means that the high-voltage side is triangular and the low-voltage side is star-shaped, and the neutral point on the low-voltage side is grounded. When we have a deep understanding of the internal laws of the transformer connection group, no matter how complex the nameplate identification, we can understand the mystery at a glance, so as to accurately grasp the performance and scope of application of the transformer, and provide a solid guarantee for the stable operation and efficient work of the power system.
▷ Transformer connection groups and winding methods: In the authoritative and normative system of IEC standards, the latest and detailed representation of transformer winding connection groups is clearly specified. As far as the three-phase transformer winding is concerned, when it is connected into several different forms, such as star, triangle and zigzag, the high-voltage winding is represented by the capital letters Y, D and Z with specific meanings and identification functions. For medium and low voltage windings, in order to distinguish them, they are represented by lowercase letters y, d, and z, respectively.
更进一步来讲，如果是星形或曲折形联结并且存在中性点引出的情况，那么则会分别通过大写的 YN 或 ZN，以及小写的 yn 或 zn 来进行精准的表示。这种细致且严谨的表示方式，旨在确保在电力领域中对于变压器绕组联结情况的描述准确无误。要知道，变压器的绕组联结并非简单的组合，而是按照高压、低压绕组联结的先后顺序进行有机组合，如此形成的特定组合形式，便是所谓的绕组的联结组。
▷ Common connection groups and scope of application of transformers:1. The significance of Dyn11: The "D" in it represents the triangular connection on the high-voltage side. This connection has good stability and voltage resistance, and can withstand high voltage and current shocks. The "y" indicates that the low-voltage side is a star connection, which helps to reduce harmonic interference and improve power quality. "N" means that the neutral point on the low pressure side is drawn out, and this design provides convenient conditions for the grounding protection of the system. The "11" refers to a 30-degree phase difference on the high and low pressure sides.
2. The meaning of Yyn0: "Y" indicates that the high-voltage side is a star-shaped connection, and there is no neutral point to lead. This connection simplifies the wiring structure on the high-voltage side to a certain extent. "Y" indicates that the low-pressure side is also star-shaped, and "N" represents the neutral point leading out. "0" means that the phase difference between the high and low pressure side is 0 degrees. Occasions of use: basic balance of three-phase load; The harmonics of the power supply system are not serious; Commonly used in 10KV systems.
3. Yd1 significance: "Y" represents the high-voltage side for the star connection, which is conducive to reducing the insulation requirements of the high-voltage side and saving costs. "D" indicates that the low-voltage side is triangular connection, which can provide a better loop current path and enhance the load capacity of the transformer. "1" indicates that the phase difference between the high and low pressure side is 30 degrees. In terms of use occasions, the Yd1 connection method is commonly used in 35KV power distribution systems.
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