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发电厂电力变压器运行知识大全(全新课件).ppt

  • 2026-04-06 04:41:04
发电厂电力变压器运行知识大全(全新课件).ppt

来源:电厂运行班

变压器接线组别 

定义:反映变压器高、低压绕组的联结方式以及高、低压绕组对应线电动势的相位关系。

表示方法

联结方式:Yd;Dy;Yy;YNy;Dyn

相位关系:联结组别号表示

联结组别号的数字乘以30°,就是二次绕组的线电动势滞后于一次侧电动势的相位角。

时钟表示法-高压绕组线电压相量作为分针指向12点,低压绕组线电压相量作为时针指向的点数就是三相变压器的联接组别号

我国常用电力变压器联结组

Yyn0 —— 用于低压配电变压器(如10/0.4kV)

Yd11 —— 用于中低压变压器(如35/10.5kV)

YNd11 —— 用于高压变压器(如220/110kV)

三相变压器空载试验

试验分析

变压器空载损耗主要是铁芯损耗,此外包括少量的铜损和附加损耗。

变压器铁损与负载电流无关。电压偏离额定值时,由于磁路饱和的原因,空载电流和空载损耗将非线性地显著增大或减少。 

与制造厂参数比较空载电流百分数、空载损耗应无明显变化。

变压器压器在空载情况下,高压绕组的电压与低压绕组的相电压之比称为变压比。变压比试验是在变压器一侧施加电压,用仪表或仪器测量另一侧电压。

变压器负载(短路)试验

负载试验指变压器任意一侧绕组短路,从另一侧绕组加入额定频率的交流电压,使绕组内的电流为额定值时,测量短路阻抗和负载损耗。

负载试验目的

计算和确定变压器是否满足并联运行条件;计算和试验变压器短路时的热稳定和动稳定;计算变压器的效率;计算变压器二次侧电压由于负载改变而产生的变化。 

变压器可采用改变分接头的方法来调节输出电压的高低,每个分接头的调整量在1%~2.5%范围内。

1.变压器常见异常及故障原因

变压器绕组故障占变压器总故障的比例较大,问题突出。

变压器铁心过热,包括多点接地,硅钢片段间短路和零序磁通导致铁心夹件过热等。

线圈导电流回路的过热,主要是分接开关接触不良,引出线接头松动等。

变压器套管故障,包括电容芯劣化,受潮和接头发热等。

有载分接开关故障,包括接触不良和元件老化等操作失灵。

冷却器故障有渗漏(渗出油,漏入空气)、有金属颗粒、油泵和风扇机械故障等。

储油柜胶囊呼吸不畅,压力释放装置和瓦斯继电器误动等。

高压电抗器特有的铁心和夹件过热,线圈绝缘损坏和局部放电也时有发生。

变压器异常运行声音及处理

若变压器声音夹有放电的“吱吱”声时,可能是变压器器身或套管发生表面局部放电。若是套管的问题,在气候恶劣或夜间时,可见到电晕或蓝色、紫色的小火花,应在清除套管表面的脏污,再涂RTV涂料或更换套管。如果是器身的问题,把耳朵贴近变压器油箱,则可能听到变压器内部由于有局部放电或电接触不良而发出的“吱吱”或“噼啪”声,此时应停止变压器运行,检查铁心接地或进行吊罩检查。 

若声响中夹有水的沸腾声时,可能是绕组有较严重的故障或分接开关接触不良而局部严重过热引起,应立即停止变压器的运行,进行检修。

当响声中夹有爆裂声时,既大又不均匀,可能是变压器的器身绝缘有限击穿现象。应立即停止变压器的运行,进行检修。

响声中夹有连续的、有规律的撞击或摩擦声时,可能是变压器的某些部件因铁心振动而造成机械接触。如果是箱壁上的油管或电线处,可增加距离或增强固定来解决。另外,冷却风扇、油泵的轴承磨损等也发出机械摩擦的声音,应确定后进行处理。

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*免责申明:文章为作者独立观点,不代表【变压器与成套视界】立场。如因作品内容、版权等存在存在问题,请于本文刊发30日内联系【变压器与成套视界】进行删除或洽谈版权使用适宜。线上广告合作:17301750044

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  1. CONNECT:[ UseTime:0.000492s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000671s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000241s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001563s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000737s ]
  6. SELECT * FROM `set` [ RunTime:0.001043s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000774s ]
  8. SELECT * FROM `article` WHERE `id` = 489683 LIMIT 1 [ RunTime:0.005528s ]
  9. UPDATE `article` SET `lasttime` = 1775452638 WHERE `id` = 489683 [ RunTime:0.002018s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000377s ]
  11. SELECT * FROM `article` WHERE `id` < 489683 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001919s ]
  12. SELECT * FROM `article` WHERE `id` > 489683 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002390s ]
  13. SELECT * FROM `article` WHERE `id` < 489683 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.016244s ]
  14. SELECT * FROM `article` WHERE `id` < 489683 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.015594s ]
  15. SELECT * FROM `article` WHERE `id` < 489683 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003973s ]
0.146165s