CN101641855A - 一种变压器装置 - Google Patents
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Abstract
本发明提供了一种变压器装置，包括具有中性线并且是对称式的变压器，特别是鼠笼式变压器，而且所述变压器具有与其中性线相连的电抗器绕组。该变压器可以是任何一种具有一个中性线的变压器，例如Y－n/Y－n，Z－n/Z－n，Y－n/Z－n或者Z－n/Y－n型变压器。变压器装置通过使变压器与电抗器绕组相连的相为对称，使得该装置具有较轻的重量。这与所有相都是对称的E形铁心变压器相比较而言，该变压器装置具有较轻的重量，因此，当其中一相的接地故障出现的时候，不管是哪相遭受接地故障都无需任何补偿绕阻。
Description
技术领域
本发明涉及一种变压器装置，特别涉及一种包括变压器的变压器装置，电抗器与所述变压器相连用于将变压器与地互联。
背景技术
电力分配是将(销售之前的)电力传输到终端用户的倒数第二阶段。这个过程通常认为包括中压电力线(一般小于50千伏)，电力变电站和装配磁极的变压器，低压电力线(一般小于1千伏)。
在用来电力分配的变压器装置中经常用到电抗器绕组。电抗器绕组是用来产生无功功率的。电抗器绕组应用在很多不同的环境中。电抗器的一种应用是作为接地使用的，用来改变电力传输系统中的电流。由此电抗器可以设计成并用于限制接地故障处的电容电流几乎达到零，这是通过建立接地的无功电流来平衡从电网流出的对地电容电流的流量来实现的。这样的电抗器也称之为消弧线圈(Petersen coil)。
因此，在变压器上增加一个连接到变压器原边中性点的电抗器，就经常使用在电力传输系统的分配网络中的变压器装置之中。
变压器和电抗器的结合一般用在电力分配网络的原边。由于变压器装置比较重，为此需要这种变压器装置重量较轻又不降低性能。而且因为变压器装置较重，并且需要耗费相当贵的材料，为此需要减少制造这种变压器装置所需的材料总量。
因此需要一种易于制造、并且要比传统的电抗器铁心耗费较少的材料的电抗器铁心，从而使其重量更轻。
发明内容
本发明的一个目的是克服由变压器和电抗器绕组构成的现有变压器装置中的一些问题。
本发明的另一个目的是提供一种由变压器和具有易安装且满足材料有效性需要的电抗器绕组组成的变压器装置。
本发明还有一个目的是提供一种由变压器和具有减轻重量的电抗器绕组组成的变压器装置。
本发明的这些以及其他目的由所附权利要求所述来实现。因此，本发明提供了一种包括具有中性线、并且是对称的变压器的变压器装置，尤其是鼠笼式变压器，并且变压器具有一个与变压器中性线相连的电抗器绕组。
该鼠笼式变压器可以是任何一种具有中心线的变压器，例如Y-n/Y-n，Z-n/Z-n，Y-n/Z-n或者Z-n/Y-n型变压器。
通过提供一个具有与电抗器绕组相连的相为对称相的变压器，从而使得变压器装置的重量更轻。这与所有相都是对称的E形铁心变压器相比较，该变压器装置具有较轻的重量。这样如果在这样一相中出现接地故障时，无论哪相出现接地故障都无需任何补偿绕组。在传统的E形铁心变压器中，取决于接地故障发生在哪相，不同的接地故障将会导致需要不同的无功补偿。因此，在传统的变压器装置中，为了补偿不同相的不同接地故障就需要不同类型的额外绕组。
本发明通过提供了一种对称式变压器、尤其是一种鼠笼式变压器，其相对于所有相都是自然对称的并且不管哪相发生了接地故障只需要同样的无功功率，因此本发明解决了现有技术中不同相发生了接地故障时需要利用额外绕组补偿不同无功功率的问题。
因为无须像传统变压器装置在不同的情况下需要额外的绕组，本发明提供的变压器装置大大减轻了重量。而且因为具有更少的需要安装的组件，使得本发明的变压器装置易于制造。
附图说明
下面以非限定的示例方式并参照附图详细描述本发明，其中；
图1是电力的网络分布总图；
图2a是包括变压器和电抗器绕组的变压器装置的示意图；
图2b是为图2a所示装置的俯视图。
具体实施方式
在图1中，示出了具有三相的电力传输系统的示意图。该系统包括一个与Y或者Z相连接的并且设有一个消弧线圈(L)的变压器。该消弧线圈(L)与变压器原边的中性线(N)和地(E)之间互连。三相中的任何一相分别与一个容性损耗电容(capacitive losses CE)相连。当电力传输线的三相被紧密的放置在一起、例如在一个地下电缆中时，在这种情况下，容性损耗电容与空中的电力传输线相比较将变得更大，但是虽然比地下电缆小，空中电力传输线仍然有电容性损耗。
在L1，L2或者L 3任何一相发生接地故障的情况下，消弧线圈(L)将会产生由于接地故障而开始在系统中流动的无功电流(IL)对电容性电流(I2，I3，Ic)进行补偿。
在图2a中，示出了一种变压器装置。该变压器装置包括一个具有中性线和三相的鼠笼式变压器(T)。该变压器装置进一步包括连接到变压器中性线的电抗器绕组，有时称之为消弧线圈(L)。在一个优选实施例中，当俯视看时变压器具有大体为三角形的形状，而电抗器绕组位于变压器的下方并且当俯视时也成大体为三角形的形状。具有与大体三角形变压器装置一起设置的大体三角形绕组的上述设置，使得组合装置比相应的常规装置小的多。在图2b中，示出了该装置从上往下看时，具有三角形的变压器和三角形的电抗器绕组共同设置于一起。
此外，该变压器可以是任何一种具有对称相和中性线的变压器，例如Y-n/Y-n，Z-n/Z-n，Y-n/Z-n或者Z-n/Y-n型的变压器。
通过让变压器与电抗器绕组互联，从而使得变压器装置的重量更轻。而且与使用E形铁心做为变压器相比较，该变压器装置具有较轻的重量是因为，当其中一相出现接地故障时，所有相都是对称的。在传统的用E形铁心作为变压器的变压器装置中，取决于接地故障发生在哪相，不同的接地故障将会导致需要不同的无功补偿。因此，为了补偿不同相的不同接地故障结果，就需要不同类型的额外绕组。
使用如上所述的变压器装置和系统，就使得利用额外绕组对不同相进行补偿显得完全没有必要了。因为无须像传统变压器装置在不同的情况下需要考虑额外的绕组，本发明描述的变压器装置可以具有较轻的重量。而且因为具有更少的需要安装的组件，使得本发明的变压器装置易于制造。
Claims (6)
1、一种变压器装置，包括具有中性线的变压器，所述的中性线与电抗器的第一端相连，而电抗器的第二端适于与地面相连接，其特征在于，所述的变压器是对称的。
2、根据权利要求1所述的变压器装置，其特征在于，所述的变压器是鼠笼式变压器。
3、根据权利要求1或者2所述的变压器装置，其特征在于，所述的变压器连接方式是：Y-n/Y-n，或Z-n/Z-n，或Y-n/Z-n或Z-n/Y-n型。
4、根据权利要求1-3中任何一项所述的变压器装置，其特征在于，所述的变压器从一个方向看时具有大体为三角形的形状。
5、根据权利要求1-4中任何一项所述的变压器装置，其特征在于，所述的电抗器从一个方向看时具有大体为三角形的形状。
6、根据权利要求1-5任何一项所述的变压器装置，当变压器和电抗器从一个方向看都大体为三角形的形状时，其特征在于，所述的变压器和电抗器通过各自的三角形形状的边彼此相对而紧密地设置在一起。
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| CA2680051A1 (en) | 2008-09-12 |
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| SE0700560L (sv) | 2008-09-08 |
| WO2008108704A1 (en) | 2008-09-12 |
| US20100295645A1 (en) | 2010-11-25 |
| SE530911C2 (sv) | 2008-10-14 |
| US8217744B2 (en) | 2012-07-10 |
| JP2010520636A (ja) | 2010-06-10 |
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