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电力变压器中性点接地方式选择最佳吗?

2017/12/07

  电力变压器中性点接地方式选择最佳吗?

  在电力系统大功率电力变压器的实际运行中,中性点接地的处理是整个变压器装配过程中的重要环节,直接关系到电力变压器的稳定运行。在今天的文章中,让我们来看看最好的方法来选择不同类型的电力变压器,以及如何选择接地方式。信任技术人员多的了解,对大功率电源变压器专用的接地系统的制造,首先要准备一个接地,是需要挖一个至少2米深,10米长的沟,在不远的地方,远离变压器,然后用镀锌钢G80 2米长的沿沟槽3然后传播距离,安静下来,直到它在探槽揭示底部的管头。然后我们需要焊接三管头50x5的镀锌扁铁,然后导致地面和填土夯实。接地杆完成后,电源变压器的接地线可与50×5镀锌扁铁连接。在接地电极的规划过程中,电力变压器的容量将决定其接地线的大小。

  在电力系统中,大功率电力变压器中性点接地方式一般可分为中性点直接接地和低阻抗接地两大类,即大接地电流系统。另一种是中性点接地,通过消弧线圈或高阻抗接地,这种方法也被称为小接地电流系统。让我们看看在实践中适用于电力变压器的两种选择。

  在实际使用中,对10kV电力系统,因为据认为是线电压的设备的绝缘水平对设备成本的影响不大,为了提高供电可靠性,一般采用中性点不接地或经消弧线圈接地可以满足设备安全运行的需要。对于110kV以上的电力系统,主要考虑的是降低设备的绝缘水平。因此,为了简化继电保护装置,通常选用中性点接地方式。为提高供电可靠性,在线路全线采用避雷线和主动重合闸装置。

  在20-60kv电力系统,在地面上一般的三相变压器,其电容电流不大,内部网络结构不是很凌乱,进步或降低成本的影响设备的绝缘水平不明显,所以现在业界普遍会选择选择中性点经消弧线圈接地方式。和1KV以下电网中性点不接地的多。但是,如果电压为380伏/伏,电力变压器需要选择三相五线制。


  Power transformer neutral grounding method to select the best?

  In the practice of high-power power transformer in power system, the treatment of the neutral line grounding is an important part of the whole transformer assembly process, which will directly relate to the stable operation of the power transformer. In today's article, let's take a look at the best ways to choose different types of power transformers, and how to choose the grounding way. Trust many technical personnel to understand, to manufacture large power supply power transformer special grounding system, the first job is to prepare a grounding, is the need to dig a at least 2 meters deep, 10 meters long trench in the place not far away from the transformer, and then use galvanized steel G80 2 meters long along the trench 3 and then spread distance, pipe down, until it is revealed in the trench at the bottom of the tube head only. Then we need to weld three pipe heads with 50x5's galvanized flat iron, then lead to the ground and fill the soil and tamp. After the completion of the ground pole, the grounding wire of the power transformer can be connected with the 50*5 galvanized flat iron. In the planning process of this grounding electrode, the capacity of the power transformer will decide the size of its grounding wire.

  In power system, the neutral point grounding method of high-power power transformer can be generally divided into two main categories, one is neutral point direct grounding or the other is through low impedance grounding, which is also known as the large grounding current system. The other is neutral grounding, through arc suppression coil or high impedance grounding, this method is also known as the small grounding current system. Let's take a look at the two options that are suitable for the selection of power transformers in practice.

  In practical use, the power system of 6-10kV, because the equipment insulation level according to the line voltage considered has little effect on the cost of equipment, so in order to improve the reliability of power supply, generally used in ungrounded or grounded by arc suppression coil can be satisfied the needs of equipment safety operation. For the power system of 110kV or above, because the primary consideration is to decrease the insulation level of the equipment. Therefore, in order to simplify the relay protection equipment, the neutral point grounding method is usually chosen. In order to improve the reliability of power supply, the line of lightning arresters and the installation of active reclosing equipment are used in the whole line of transmission lines.

  The power system on 20-60kV, a general phase power transformer in the ground, its capacitance current is not large, the internal network structure is not very messy, equipment insulation level of progress or decline of cost effect is not obvious, so now the industry generally will choose the selection of neutral point earthing via arc suppression coil way. And the neutral points of the power grid below 1KV are mostly ungrounded. But if the voltage is 380/220V, the power transformer needs to choose the three phase five wire system.

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