巴中干式变压器：防雷配电巴中干式变压器性能差的原因

防雷配电巴中干式变压器性能差的原因 　　
普通巴中干式变压器防雷性能差原因
据统计，在雷电活动频繁的地区，配电巴中干式变压器的损坏约有40%为雷击所致。事故后检查避雷器均正确动作，这就说明击穿原因是巴中干式变压器本身造成的。为防道受雷击过电压的作用，配电巴中干式变压器采用三点一起接地的防雷保护.即高压侧避雷器接地、低压绕组中性点接地和巴中干式变压器油箱接地连在一起接地。普通巴中干式变压器都采用Yyn联结。
当高压侧三相进波时，引起避雷器动作放电，避雷器阀片电阻上产生很大的电压降——残压.作用在高压绕组上.此残压是高频电压波，雷电流经高压绕组匝间或饼间电容和对地电容，而在高压绕组内产生不均匀的冲击电压分布.高压侧三相进波时避雷器放电的电流在接地电阻上产生一个很大的冲击电压降，它遇过中线而大部分施加在低压级组上，在低压绕组内又流过雷电流，由此而产生的零序磁通将感应到高压绕组上.在高压绕组上产生很高的感应电压，通常称为逆变换过电压，其方向与残压相反，所以大值出现在高压中性点上，它的幅值比残压大几倍到几十倍。当侵入避雷器电流为1000A，接地电阻为10Ω时，一般中小型巴中干式变压器高压绕组中性点电位可达150kV，往往使其中性点附近被击穿。
当低压侧三相进波时，冲击电压分配在低压绕组和接地电阻上。侵入的雷电流通过电磁感应在高压绕组上产生感应电压.由于低压绕组中性点接地，低压绕组流过冲击电流，其值大小相等、方向相同，在高压绕组中感应出电动势。高压绕组接成Y型，三相方内相同、大小相等的冲击电流没有通路。因此，在高压绕组中虽有感应的脉冲电动势，但无冲击电流，即无反磁通。于是，低压绕组中的冲击电流全部成为励磁电流，所产生的磁通按电压比关系使高压侧中性点的电位升高，出现危险的过电压，称为正变换过电压。
上海巴中干式变压器厂与上海交通大学对30kVA/l0kV Yyn0联结的配电巴中干式变压器进行试验的结果。若雷电从低压绕组三相进波，其雷电幅值为10kv,接地电阻为5Ω。
因此，不管是正变换过电压，还是逆变换过电压，均是由于低压绕组中有雷电流流过，并在高压绕组中感应出高电压而击坏巴中干式变压器的。因此Yyn0联结的配电巴中干式变压器防雷性能较差。

Common reasons for poor performance transformer lightning
According to statistics, in an area of ??intense lightning activity, distribution transformers, about 40% of the damage caused by li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。ghtning. Check the arrester after the accident were the correct action, which shows the breakdown caused due to the transformer itself. To prevent over-voltage lightning channel by the role, power distribution transformer with a grounded three-point lightning protection lightning arrester ground that the high side, low-voltage winding neutral grounding transformer tank ground together and grounded. Ordinary transformer are used Yyn link.
When the three-phase high-pressure side into the wave, caused by lightning discharge action, arrester valves have a great resistance on the voltage drop - residual pressure. Role in the high-voltage winding. This residual pressure is high-frequency voltage wave, lightning flows through the high voltage winding Turn cake from time to time between the capacitance and capacitance to ground, and in the high voltage winding of the impact of the non-uniform voltage distribution into the three-phase high-pressure side of the arrester discharge current wave resistance in the ground to produce a great impact on the voltage drop, which met Most middle-class group on the applied voltage, low-voltage windings and in the lightning current flows, the resulting zero-sequence flux to the high voltage winding on the sensor in the high voltage winding to generate a high induced voltage, usually called voltage for the inverter replaced, the residual pressure with the opposite direction, so the maximum in high-voltage neutral point, its magnitude is several times larger than the residual pressure to a few times. When the invasion of arrester current is 1000A, grounding resistance 10Ω, generally small and medium sized high-voltage winding of the transformer neutral point potential of up to 150kV, often to near the neutral point of breakdown.
When the low pressure side of the three-phase into the wave, the impulse voltage distribution in the low-voltage winding and grounding resistor. Invade the lightning current through electromagnetic induction to generate the high voltage winding induced voltage due to low voltage winding neutral ground, the impact of current flow through the low-voltage winding, and its value is equal, in the same direction, the electromotive force induced in high-voltage winding. Into a Y-connected high voltage winding, three-phase side of the same, the impact of the current does not equal access. Thus, although the high voltage winding of the pulse induced electromotive force, but no impact on current, that is, without anti-flux. Thus, the impact of current low-voltage windings all become exciting current, the magnetic flux ge联系人：陈经理nerated by the voltage than the relationship between the high pressure side of the neutral point potential rise, a dangerous over-voltage, over-voltage is called positive transformation.
Shanghai Transformer Factory, Shanghai Jiaotong University with links to the 30kVA/l0kV Yyn0 distribution transformer test results. If the lightning into the waves from the low-voltage three-phase winding, the lightning a企业账号：1611 0032 092 00213 086mplitude 10kv, grounding resistance of 5Ω.
So, whether it is being over-voltage transformation or voltage inverter replaced, due to low voltage windings are lightning current flows in and out of the high voltage winding of high voltage induced in the transformer Jihuai. So join Yyn0 poor lightning performance of distribution transformers.

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