琼海干式变压器：琼海干式变压器局部放电试验

琼海干式变压器局部放电试验 　　
概述
工频电压、雷电冲击电压和操作冲击电压试验，其所施加的试验电压值，只是考核了产品能否经受住各种过电压的作用。但是，这种过电压值的试验与运行中长期工作电压的作用是有区别的，经受住了过电压试验的产品，能否在长期工作电压作用下保证安全运行，还需要进行局部放电试验。
所谓“局部”是指绝缘介质就其整个厚度上并非“贯穿”，只是在厚度的一个局部产生放电现象。由于局部放电的能里很小，一般仪表上不会显示出来。
局部放电的发生，有下列几个因素：
1)电场过于集中于某点。
2)固休介质有气泡，有害杂质未除净。
3)油中含水、含气、有悬浮微粒。
4)不同的介质组合中。在界面处有严重的电场崎变。绝缘内部存在的气隙(气泡)，其介电常数比绝缘材料的介电常数要小，故气隙承受的电场强度比邻近的绝缘材料上的电场强度要高。另外，气体(特别是空气)的绝缘强度却比绝缘材料低.这样，当外施电压达到某一数值时，绝缘内部所含气隙上的电场场强就会先达到使之击穿的程度.从而气隙先发生放电。这种绝缘内部气隙的放电就是一种局部放电。
还有，绝缘结构中由于设计或制造上的原因。会使某些区域的电场过于集中.在此电场集中的地方.就可能使局部绝缘(如油隙或固体绝缘)击穿或沿固体绝缘表面放电。另外，产品内部金属接地部件之间、导电体之间电气连接不良.也会产生局部故电。
绝缘内部的局部放电虽然不形成贯穿性通道，但放电会产生热量，使介质出现局部的温度升高，甚至碳化。另外，由于放电的电解作用，会产生一些活性气体(如臭氧、一氧化氮和二氧化氮等)，它们对绝缘有腐蚀作用。可见，局部放电的持续发展，会逐渐造成绝缘的损伤，促使绝缘的老化，甚至后导致整个绝缘的击穿。

Partial discharge test

Outline
Frequency voltage, lightning impulse voltage and switching impulse voltage test, the test voltage value, but they imposed this aspect of the product can withstand the role of a variety of over-voltage. However, the role of such a voltage value of the test and run the long-term operating voltage there is a difference, have withstood over-voltage test products to ensure safe operation, whether in the role of long-term operating voltage, but also the need for partial discharge test.
The so-called "local" refers to an insulating medium throughout its thickness, not "run through", but in the thickness of a partial discharge phenomenon. Partial discharge energy inside a small, general instrument will not be displayed.
The occurrence of partial discharge, the following factors:
1) the electric field is too much focus on certain points.
2) solid off-media bubble, harmful impurities, not in addition to the net.
3) Oil, water, gas and suspended particles.
4) in different media combinations. Serious electric field of distortion at the interface. Insulation within the air gap (air bubbles), the dielectric constant than the dielectric constant of the insulating material to a small air gap withstand the electric field strength is higher than the adjacent insulation material on the electric field strength. In addition, the gas (especially air) dielectric strength than insulating materials so that when the applied voltage reaches a certain value, the insulation contained within the air gap on the farm field 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。strength will be reached first by the degree of breakdown thus air-gap discharge. Insulated internal air-gap discharge is a kind of partial discharge.
Also, the insulation structure due to design or manufacturing reasons. Make certain areas of the electric field is too concentrated. Central place in this electric field can lead to partial insulation (such as the oil gap or solid insulation) breakdown or surface discharge along the solid insulation. In addition, the internal parts of the metal ground conductivity between the electrical connection is bad. Also have a local so the power.
Partial discharge of the insulation within the forms throughout the channel, but discharge generates heat to medium local temperature, even carbonation. In addition, due to the electrolysis of the discharge will produce some reactive gases (such as ozone, nitric oxide and nitrogen dioxide), have a corrosive effect on the insulation. Visible, the continued development of partial discharge, will gradually cause insulation damage, promote insulation aging, and eventually lead to the insulation breakdown.

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