Phase sequence problem of transformer in parallel operation

In the daily operation and maintenance of the power system, the parallel operation of transformers is very common, but the phase sequence problem is very important and can not be ignored.

コンテンツ

1. Phase sequence: the “order cornerstone” of the power system

Phase sequence refers to the order of the voltage of each phase of the three-phase AC power supply reaching the maximum value, with positive order, negative order and zero order. For the parallel operation of transformers, the positive phase sequence is the key. Just as the traffic rules ensure the smooth road, it “guides the direction” of power transmission, so that the current shuttles between the transformer and the electrical equipment in an orderly manner. Once the order is chaotic, the power transmission will fall into chaos, causing subsequent problems.

2. The “catastrophic consequences” in different order

If the phase sequence of the transformer is inconsistent in parallel, the consequences are extremely serious. The most direct is to cause a short circuit, different phase sequence voltage collision, instantly produce a huge current impact, like the flood washed down the dam, the strong current will burn the transformer winding, destroy the connection line, may also trigger a large area of power failure chain reaction, to bring a heavy blow to production and life. At the same time, the voltage fluctuation also follows, the unstable voltage makes the equipment can not operate normally, precision instrument failure, industrial production line stagnation, resulting in huge economic losses.

3. Phase sequence detection and safeguard measures

In order to avoid the hidden danger of phase order, the strict detection process is indispensable. Before the parallel operation, a professional phase sequence table must be used to accurately detect, to ensure that the phase sequence of each transformer is consistent, just like a doctor doing a fine physical examination for a patient. In addition, in the whole process of power system design, installation and operation and maintenance, there should be a rigorous operation process, strict control of line connection, equipment identification and other links, regular inspection and review, eliminate potential hidden dangers in time, and “escort” the smooth operation of the power system.

概要

In short, the phase sequence of the transformer in parallel operation is related to the safety and stability of the power system. Only by understanding its importance, knowing the harm, and taking scientific detection and safeguard measures, can the transformer operate in parallel safely and efficiently, continuously and stably provide power supply, and ensure the normal operation of production and life.

連絡先

廬山,est。 1975年には中国の専門職の専門メーカーの電力変圧器及び原子炉のための50+る。 主製品 単相トランス、三相絶縁変圧器、電気トランス、物流トランス、ステップの下、信用リスク以外のリスクにつきトランス、低電圧トランス、高電圧トランス、制御トランス、トロイダルトランス、Rコアトランス直流インダクター、AC炉では、フィルタリング炉、負荷炉chokes、フィルタリングの原子炉は、中間体、高周波製品.

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