广元干式变压器：配电广元干式变压器容量选择

配电广元干式变压器容量选择 　　
由广元干式变压器的效率曲线可知，当广元干式变压器的输出功率为零时，效率也为零；当输出功率增大时，效率也加大；当效率达到大值，如果继续增大广元干式变压器的输出功率，效率便会下降。这是因为在一定的电压下，广元干式变压器的铁损是个常数，当输出功率较小时，因铁损不随负载而变化，则广元干式变压器效率就降低。又因为广元干式变压器的铜损与负载电流的二次方成正比，当负载电流增加到一定程度时，铜损增加的速度更快。用数学分析方法可以证明，当铜损和铁损相等时，广元干式变压器的效率高。
广元干式变压器空载运行时，需用较大的无功功率，这些无功功率要由供电系统供给。广元干式变压器的容量若选得过大，不但增加初投资，而且使广元干式变压器长期处于轻载运行，出现“大马拉小车”的现象，使空载损耗的比重增大，功率因数降低，网络损耗增加；广元干式变压器的容量若选得过小，会使广元干式变压器长期过负载，易损坏设备。
广元干式变压器的佳负载率是在40%—70%之间，负载率过高，损耗明显增大;另一方面，由于广元干式变压器容量裕度小，负载稍有增长，便需增容，更换大容量的广元干式变压器，或新增一台广元干式变压器。频繁增容势必增加投资，且影响供电。因此，必须合理地选用广元干式变压器的额定容量，应考虑以下几点：
1)额定容量应能满足全部用电负载的需要，即满足全部用电设备总计算负载的需要。就是说，不能使广元干式变压器长期处于过负载状态下运行。
2)对于具有两台及以上广元干式变压器的变、配电所，应考虑其中任何一台广元干式变压器故障时，其余广元干式变压器的容量应能满足1、2类全部负荷的需要。
3)选用的容量种类应尽量少，以达到维修方便及减少备品备件的目的。
4)广元干式变压器的经常负载应以大于广元干式变压器额定容量的60%为宜。
5)若广元干式变压器容量过大，可能使低压线路延伸过长，会增加线路损耗。
6)不应过分地增大备用容量，否则不仅会增加投资，而且因为负载系数过低，功率因数低，使网损耗增大。
7)为了限制低压侧短路时的短路电流，配电广元干式变压器容量不宜超过1000kVA。
总之，选择配电广元干式变压器的容量，要以现有负荷为依据，适当考虑负荷发展。《农村低压技术规程》中规定了选择配电广元干式变压器容量按照5年发展计划确定。

Distribution transformer capacity selection

Curve indicated by the efficiency of the transformer when the transformer output power is zero, the efficiency is zero; when the output power increases, the efficiency is also increased; when the efficiency reaches its maximum, if it continues to increase the output power of the transformer, the efficiency will will decline. This is because in a certain voltage, the transformer iron loss is a constant, when the output power is small, due to iron loss does not vary with load changes, the transformer efficiency is reduced. Because the transformer copper loss and the load current is proportional to the quadratic, when the load current increases to a certain extent, the increase in copper loss faster. Mathematical analysis can be shown that the copper loss and iron loss is equal to the highest efficiency of the transformer.
Power transformer no-load operation, the required reactive power, reactive power supplied by the power supply system. If the capacity of the transformer selected to华盈非晶合金变压器有限公司是具备生产220KV电压等级变压器的现代化机械制造企业，公司注册资本8800万元，现有员工300余人，占地面积300余亩，公司拥有各种生产和使用设备100余台，产品工艺水平高，检测设备齐全，企业管理严格，产品质量可靠。求精务实，开拓创新，为用户提供完美的变压器解决方案，满足各层次客户的需求。主要产品有非晶合金变压器，干式变压器，SH15-M系列非晶合金变压器，非晶合金铁芯配电变压器，SCRBH15非晶合金干式变压器，SGBH15非晶合金变压器（10KV级），SCRBH15非晶合金卷铁芯干式变压器，35kv非晶干变变压器 35kv非晶油变变压器，超强过载能力变压器、电力变压器、油浸式变压器、矿用变压器、整流变压器、电炉变压器、特种变压器、等等，并提供新能源发电的升压及并网解决方案。我公司除生产以上10多个系列200多个品种，600多种规格的变压器外，还向用户提供非标特种产品的设计、制造。以上产品符合GB1094、GB/T6451、GB6450标准和等效IEC（国际电工委员会）标准。o large, not only to increase the initial investment, a long period of light load and the transformer, the emergence of the phenomenon of "horse cart", so the increase of the proportion of no-load loss, lower power factor increase in network losses; If the capacity of the transformer selected too small, the transformer will be long-term overload, and easy to damage the device.
Transformer load rate is between 40% -70%, the load rate is too high, the loss is significantly increased; the other hand, the load increased slightly due to the transformer capacity margin is small, will be required Capacity, the replacement of large-capacity transformer, or a new transformer. The frequent compatibilizer is bound to increase investment, and affect the power supply. Therefore, must be reasonable selection of the rated capacity of the transformer, should consider the following:
1) The rated capacity should be able to meet the needs of all electricity load is met by the needs of all electrical equipment is the total computational load. That is, you can not make the transformer a long period of running under load conditions.
2) for two and above the transformer, power distribution, you should consider any failure of a transformer, the remaining capacity of the transformer should be able to meet the needs of the full load of classes 1 and 2.
3) selection of the capacity of the species should be minimized in order to achieve the purpose of easy maintenance and reduce spare parts.
4) the transformer is often load should be greater than 60% of the rated capacity of the transformer is appropriate.
5) If the transformer capacity is too large, may make the low pressure line extension is too long, it will increase the line losses.
6) should not unduly increase the reserve capacity, or will not only increase investment, but also because of the low load factor, low power factor, the electricity network losses increase.
7) In order to limit the short circuit of the low voltage side of the short-circuit current, power distribution transformer capacity not more than 1000kVA邮 箱：1262980066@qq.com.
In short, the choice of distribution transformer capacity to the existing load, give due consideration to the development of the load. The rural low voltage power, the technical regulations specified in the select distribution transformer capacity determined in accordance with the five-year power development plan.

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