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[南方电网]南方电网26年2批笔试真题

  • 2026-06-10 21:01:33
[南方电网]南方电网26年2批笔试真题

1.理想变压器中,同向输入端和反向输入端的电压相等且为零,称为“虚断”。(

2.任意一个非正弦周期函数可以分解为奇函数和偶函数之差。(

3.RC电路在零正和零负之间电容电压不会跳变。(

4.叠加定理只适用于线性电路。(

5.高压引线上放金属扁球的作用。

6.三相半波整流电路导通角多少度时整流电压为0.( D

A.60°B. 90°C. 120°D. 150°

7.戴维南等效电阻计算的概念。

8.定时限过电流保护能够保护本线路及下一线路的全长。(

9.下列属于绝缘试验的是(

A.交流耐压

B. 绝缘电压 

C. 冲击耐压 

D. 直流耐压

10.同步电动机超前运行时吸收还是发出什么功率( 

A.吸收容性无功

B. 吸收感性无功

     C.发出容性无功

     D. 发出感性无功

11.三相变压器线电动势不含三次谐波。( 

   

13.励磁电压下降对定子电流及振幅的影响( 

A.上升

B. 下降 

C. 不变

14.变压器并联运行的条件( 

A.联接组别相同

B.电压比相等

C.短路阻抗相等

D.相序相同

E.阻抗角相同

15.同步电机负载转矩不变,电源电压降低5%,定子电流、定子转速如何变化( 

A.定子电流升高,转子转速不变

B.定子电流降低,转子转速不变

C.定子电流升高,转子转速降低

D.定子电流降低,转子转速升高

16.单相、三相PWM逆变器与单极性、双极性调制的关系(C D 

A.单相只能使用单极性调制

B.三相只能用双极性调制

C.单相能用单极性调制和双极性调制

D.三相能用单极性调制和双极性调制

17.发生短路时,系统网络阻抗( 

A.变小

B. 变大 

C. 不变

18.变压器静态稳定定义的判断。

19.并联电抗器会不会消耗无功功率。

20.下列选项中不属于中性点有效接地的是( 

A.中性点经消弧线圈接地

B.中性点经高电阻接地

C.不接地

D.中性点经低电阻接地

21.PQ法优点

22.无限大电源三相短路出现直流分量的原因是( )的电流不能发生突变。

A.电阻

B. 电导 

C. 电感 

D.电容

23.距离保护的组成、原理、测量阻抗的定义

24.阻抗继电器过原点的是全阻抗。

25.下列属于介质损耗的有( 

A.电导损耗

B.偶极子电极

C.夹层电极

D.电子电极

26.电气距离固定,固体介质沿面闪络电压比纯气体击穿电压更低。

27.三相电压型桥式逆变电路输出线电压不含三次谐波。( 

29.同步电机过励磁运行时,向电网吸收( )无功。

A.不确定B. 容性 C. 感性 D. 阻性

30.异步电机负载转矩不变,电源电压下降50%,稳定运行后定子电流和转矩的变化为(

A.下降,下降

B. 下降,不变 

C. 升高,不变 

D. 升高,下降

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  133. /yingpanguazai/ssd/ssd1/www/f.15386.cn/vendor/topthink/framework/src/think/Cookie.php ( 6.06 KB )
  134. /yingpanguazai/ssd/ssd1/www/f.15386.cn/vendor/topthink/think-view/src/Think.php ( 8.38 KB )
  135. /yingpanguazai/ssd/ssd1/www/f.15386.cn/vendor/topthink/framework/src/think/contract/TemplateHandlerInterface.php ( 1.60 KB )
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  137. /yingpanguazai/ssd/ssd1/www/f.15386.cn/vendor/topthink/think-template/src/template/driver/File.php ( 2.41 KB )
  138. /yingpanguazai/ssd/ssd1/www/f.15386.cn/vendor/topthink/think-template/src/template/contract/DriverInterface.php ( 0.86 KB )
  139. /yingpanguazai/ssd/ssd1/www/f.15386.cn/runtime/temp/884b124e7eb77b19be33fbfc051ff491.php ( 12.06 KB )
  140. /yingpanguazai/ssd/ssd1/www/f.15386.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000972s ] mysql:host=127.0.0.1;port=3306;dbname=f_15386;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001606s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.011151s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001816s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001686s ]
  6. SELECT * FROM `set` [ RunTime:0.001514s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001851s ]
  8. SELECT * FROM `article` WHERE `id` = 466121 LIMIT 1 [ RunTime:0.001770s ]
  9. UPDATE `article` SET `lasttime` = 1781102896 WHERE `id` = 466121 [ RunTime:0.018522s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000802s ]
  11. SELECT * FROM `article` WHERE `id` < 466121 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001231s ]
  12. SELECT * FROM `article` WHERE `id` > 466121 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001344s ]
  13. SELECT * FROM `article` WHERE `id` < 466121 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002049s ]
  14. SELECT * FROM `article` WHERE `id` < 466121 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.012585s ]
  15. SELECT * FROM `article` WHERE `id` < 466121 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001898s ]
0.237384s