Добавил:
Опубликованный материал нарушает ваши авторские права? Сообщите нам.
Вуз: Предмет: Файл:

Переходные процессы в системах электроснабжения. Учебное пособие

.pdf
Скачиваний:
1
Добавлен:
08.09.2026
Размер:
2 Мб
Скачать
☆
31
                                            
                ,     
                                 

          

         :

󰇛󰇜
 (3.13)
                   
       - 
                 
 - 
            
 ,  

),
   







- 
  
 
3.

, (3.14)


-  






- 


.

(3.15)



  3.6.

32

         

 
    
.

33


 

- 

   
   

.
  3.    
                        
(

).
     
󰇛󰇜 
              
.
    
   

 

       t  t   :
󰇛󰇜
 


(3.16)

 
      
.

       
  

t=0.
3.3. Начальный ток короткого замыкания
                  

      
 
       




      



󰇛󰇜

󰇛󰇜
 󰇛󰇜
(3.17)
34




󰇛󰇜

󰇛󰇜

0,2
0,13
1,12
1,078

0,35
0,25
1,15
1,21

󰇛󰇜 󰇛󰇜





󰇛󰇜

󰇛󰇜; (3.18)
󰇛󰇜
 󰇛󰇜

(3.19)


󰇛󰇜 󰇛󰇜


󰇛󰇜 , (3.20)
            󰇛󰇜 -         (󰇟󰇛
󰇜
    
].
:


. (3.21)


      
:





. (3.22)


         
         



      

󰇛󰇜  


󰇛󰇜

       
          



   
   

      

 
(3.19);
      

35
       

3.4. Ток короткого замыкания в произвольный момент времени
              

󰇛󰇜


󰇛󰇜
 
󰇛󰇜 (3.23)

      
d q :
󰇛󰇜



󰇛󰇜
󰇛󰇜
󰇛 
󰇛󰇜
(3.24)
󰇛󰇜
󰇛󰇜

󰇛󰇜
󰇜
󰇡
󰇡
󰇢

󰇢
󰇛 

󰇛󰇜

󰇜
󰇡
󰇡

󰇢


󰇢


󰇛󰇜
󰇛󰇜

󰇛󰇜

, (3.25)

 ,, -   
    T              
                  
 
  

󰇛󰇜
󰇛󰇜 󰇛
󰇛󰇜󰇛  󰇛󰇜󰇜


󰇛



󰇜

󰇛󰇜
  󰇛



󰇜



󰇡



-  


 



󰇜
, (3.26)
󰇢

        
      , 
36
     ,     , 
3.5. Установившийся режим короткого замыкания
              


        
       
  -      
   [   󰇛󰇜]    [  
󰇛
      
󰇜]  

,

 

, (3.27)
 ;      


  
 
.

       
   
  


(3.28)

 
. (3.29)

             
 3.8)
󰇛󰇜 󰇛  󰇜
        
. (3.30)


37
   
  



      




 3.
   


󰇛

.
 
󰇜
 
:

󰇛

󰇛



󰇜

󰇜







; ( 3.32)


(3.31)



. ( 3.33)

 
 
󰇛󰇜
󰇛


󰇜

. 3.8

:
38
 
󰇛󰇜
. (3.34)

       I
      
(3.34).  
1.     

 
    







, (3.35)

   

       




.
2. :





. (3.36)









 (3.37)
  
                       
.
39
4. КОРОТКИЕ ЗАМЫКАНИЯ В СИСТЕМАХ ЭЛЕКТРОСНАБЖЕНИЯ
4.1. Виды, причины и последствия коротких замыканий
                   

 
       

-
      
 
- 
        
4.1).
        
󰇛󰇜

󰇛󰇜
󰇛󰇜


󰇛󰇜

󰇛󰇜
 
󰇛󰇜
󰇛
󰇜


 .

  4.2).
      
   47   19,1  26,2   7,7 %.
       
 ;       

; 
40


Режим нейтрали сети
-


-










󰇛󰇜


󰇛󰇜


󰇛

󰇜





󰇛

󰇜


󰇛󰇜


󰇛󰇜


󰇛

󰇜





󰇛

󰇜







󰇛

󰇜



󰇛

󰇜

Соседние файлы в предмете [НЕСОРТИРОВАННОЕ]