Page 20 - 九控电气科技有限公司

▁ 常用三相变压器线圈连接方式的特点与适用范围
Characteristics and application range of common three-phase transformer coil connection mode

Y/Y

• 线圈导线截面大，线圈的空间利用率高，适用于配电变压器、联络变压器 及三相负载对称的特种变压器。
• 中性点可引出，适用于三相四线制负载，但对于单相变压器级成的三相组（以下简称单相组）或三相三柱旁轭式铁心的变压器（以上简
称三柱旁轭式） 其一次侧中性点必须与电源中性点连接，否则不能采用此种连接法。
• 对于三相三柱式铁心的变压器（以下简称三柱子式），其一次侧中性点不能与电源中性点连接。而二次侧供三相四线制负载时，中线电
流应加以限制。
• It is suitable for distribution transformer, connection transformer and special transformer with symmetrical three-phase load.
•The neutral point can be drawn out and is applicable to three-phase four-wire load, but for single-phase transformer grade three-phase group
(hereinafter referred to as single-phase group) or three-phase three-pillar side-yoke type core transformer (above referred to as three-pillar
side-yoke type) one of the secondary neutral point must be connected to the power supply neutral point, otherwise this connection method
cannot be used.
•For transformer with three-phase three-pillar core (hereinafter referred to as three-pillar core), its secondary neutral point cannot be connected
with the power neutral point. When the secondary side is loaded with three-phase four-wire system, the Central Line current should be limited.

△ / △

• 线圈导线截面小，线圈的空间利用率低，只适用于低电压大电流变压器。
• 允许三相负载不对称，一相发生故障时，其余相按 V 接法可继续运行，此时三相输出容量减为原来的 0.866（对于三相变压器，故障相
的线圈应与其余两相断开并开路，如故障由于匝间短路，则不能改接成 V 接法继续运行）。
• 无 3 次谐波电压，不能供三相四线制负载，也不适用于高电压变压器。

• a small coil wire section, coil space utilization rate is low, only suitable for low voltage large current transformers.
• allow the asymmetric three-phase load, a failure occurs, press V connection can continue to run the rest, the three-phase output capacity
is reduced to the original 0.866 (for three-phase transformer, the fault phase coil should disconnect with the rest of the two phase and open
circuit, such as fault because of turn-to-turn short circuit, cannot convert into a V connection to continue running).
•no harmonic voltage 3 times, can't for three phase four wire system load, also does not apply to high voltage transformer.

Y / △ △ / Y

• 无 3 次谐波电压，适用于各类大、中型变压器。△ /Y 形连接法用于配电变压器时，允许三相负载不对称程度比 Y/Z 形连接法大些，中性
线电流允许达到额定电流 75% 左右，但引线结构较复杂，△形接法的缺点同△ / △形连接法的第一条。 11

• Y 形接法的中性点可引出。
• 任意一相的一个线圈发生故障，变压器必须停止运行。
• no 3 times harmonic voltage, suitable for all kinds of large and medium-sized transformers. < / p > < p > Y connection method for
distribution transformer, allow three-phase load asymmetry degree than Y/Z connection method is larger, neutral line current allows rated
current 75% or so, but lead structure is more complex, the disadvantages of the shape connection method with the first train/train connection
method.
• Y connection of the neutral point can lead to.
• a coil of any phase fails, the transformer must stop running.