阳泉干式变压器：阳泉干式变压器试验项目

阳泉干式变压器试验项目 　　
阳泉干式变压器的试验项目在GB6450-1986(阳泉干式变压器)中规定，局部放电测量为特殊试验。现在GB/T10228-1997《阳泉干式变压器技术参数和要求》中规定，应手 机：13287501888包括包封绕组并采用浇注工艺的阳泉干式变压器.应进行局部放电测量，且该试验为例行试验。
在测量视在电荷q值(以pC表示)时.对于阳泉干式变压器，按机械行业标准JB/T56009- 1998《阳泉干式变压器产品质量分等》中对局部放电测量规定.包封绕组优等品为5pC，一等品为10pC；合格品为30pC。
由上述可见.对于阳泉干式变压器的局部放电我国要求是很严格的.尤其是对包封绕组，绝缘中不能含有或很少存有气隙(气泡).方能达到合格品及以上要求。
关于雷电冲击试验, IEC标准不要求做截波试验。有的国家认为，入侵的雷电波是避雷器动作后.在阳泉干式变压器上出现的波形为单一极性衰减振荡波，振荡波的放电电压比全波高11.7%—33.6%。但有的也认为振荡波与截波不是等同的。
外绝缘闪络引起的截波是否存在.美国电气和电子工程师协会(IEEE)对超高压阳泉干式变压器绝缘中认为电站内其它设备闪络发生的事实存在，因而明确认为做截波试验是正确的。
对于阳泉干式变压器匝间绝缘故障，尤其是匝间短路，是阳泉干式变压器，特别是树脂绝缘阳泉干式变压器关心的问题之一。因为匝间短路是无法修复的.而且必须退出运行，过去较为普遍认为匝间短路是在雷电作用下，特别是绕组的首端匝间梯度电压过高引起的，但也有的认为在正常运行电压下也有发生匝间绝缘故障的实例。
我国标准GB311.1—1997(高压输变电设备的绝缘配合)中，雷电冲击波试验采用了全波和截波试验，在波尾截断的标准雷电冲击截波具有2—6μs之间的截断时间。

Dry-type transformers pilot project

Dry-type transformers pilot project in GB6450-1986 (dry type power transformers) stipulates that the partial discharge measurements for special tests. GB/T10228-97 "dry-type power transformers technical parameters and requirements" provisions should be included encapsulated windings and the transformer of the pouring process. Partial discharge measurements should be carried out, and that the test as a routine test.
Measurement of apparent charge q value (expressed by the pC) for dry-type transformers, machinery industry standards JB/T56009- 1998 dry type power transformer product quality grading in partial discharge measurements provide superior product of the encapsulated winding for 5pC, first-class products for 10pC; qualified products 30pC.
Seen from the above. For dry-type power transformers, partial discharge of the requirements are very strict, especially encapsulated windings, insulation not contain little or there is the air gap (air bubbles). In order to reach the qualified products and the above requirements.
The lightning impulse test, the IEC standard does not require to do the cut-off wave test. Some countries believe that the invasion of lightning surge arrester action. Waveform in the transformer for a single polarity attenuation Sasser, Sasser discharge voltage of 11.7% -33.6% higher than the full-wave. But some also believe that Sasser chopper is not equivalent.
External insulation flashover caused by chopper exists. American Institute of Electrical and Electronics Engineers Inc. (IEEE) on EHV transformer insulation that the power plant within other equipment flashover occurred in fact exist, and thus clear that the chopped wave test is correct.
For transformer interturn insulation failure, especially inter-turn short-circuit dry-type power transformers, in particular, is one of the greatest concern of the resin dry-type power transformers. Interturn short circuit can not be repaired and must be out of operation, the past is more common that interturn short circuit lightning effect, especially the first side of the winding interturn gradient voltage is too high due to, but some believe that in the normal operating voltage the next occurrence of an instance of the interturn insulation failure.
Of the standard GB311.1-1997 (high-voltage power transmission equipment, insulation coordination), the lightning shock wave experiment using full-wave and chopped wave tes企业账号：1611 0032 092 00213 086t, the standard lightning impulse wave tail truncation chopper truncated time between 2-6μs .

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