¡¶µçÁ¦µç×Ó¼¼Êõ¡·Ï°Ìâ½â´ð(1) ÏÂÔØ±¾ÎÄ

¡¶µçÁ¦µç×Ó¼¼Êõ¡·Ï°Ìâ½â´ð

µÚ2Õ ˼¿¼ÌâÓëϰÌâ

2.1¾§Õ¢¹ÜµÄµ¼Í¨Ìõ¼þÊÇʲô? µ¼Í¨ºóÁ÷¹ý¾§Õ¢¹ÜµÄµçÁ÷ºÍ¸ºÔØÉϵĵçѹÓÉʲô¾ö¶¨? ´ð£º¾§Õ¢¹ÜµÄµ¼Í¨Ìõ¼þÊÇ£º¾§Õ¢¹ÜÑô¼«ºÍÑô¼«¼äÊ©¼ÓÕýÏòµçѹ£¬²¢ÔÚÃż«ºÍÑô¼«¼äÊ©¼ÓÕýÏò´¥·¢µçѹºÍµçÁ÷£¨»òÂö³å£©¡£

µ¼Í¨ºóÁ÷¹ý¾§Õ¢¹ÜµÄµçÁ÷ÓɸºÔØ×迹¾ö¶¨£¬¸ºÔØÉϵçѹÓÉÊäÈëÑô¼«µçѹUA¾ö¶¨¡£

2.2¾§Õ¢¹ÜµÄ¹Ø¶ÏÌõ¼þÊÇʲô? ÈçºÎʵÏÖ? ¾§Õ¢¹Ü´¦ÓÚ×è¶Ï״̬ʱÆäÁ½¶ËµÄµçѹ´óСÓÉʲô¾ö¶¨?

´ð£º¾§Õ¢¹ÜµÄ¹Ø¶ÏÌõ¼þÊÇ£ºÒªÊ¹¾§Õ¢¹ÜÓÉÕýÏòµ¼Í¨×´Ì¬×ª±äΪ×è¶Ï״̬£¬¿É²ÉÓÃÑô¼«µçѹ·´ÏòʹÑô¼«µçÁ÷IA¼õС£¬IAϽµµ½Î¬³ÖµçÁ÷IHÒÔÏÂʱ£¬¾§Õ¢¹ÜÄÚ²¿½¨Á¢µÄÕý·´À¡ÎÞ·¨½øÐС£½ø¶øÊµÏÖ¾§Õ¢¹ÜµÄ¹Ø¶Ï£¬ÆäÁ½¶Ëµçѹ´óСÓɵçÔ´µçѹUA¾ö¶¨¡£

2.3ζÈÉý¸ßʱ£¬¾§Õ¢¹ÜµÄ´¥·¢µçÁ÷¡¢Õý·´Ïò©µçÁ÷¡¢Î¬³ÖµçÁ÷ÒÔ¼°ÕýÏòתÕÛµçѹºÍ·´Ïò»÷´©µçѹÈçºÎ±ä»¯£¿

´ð£ºÎ¶ÈÉý¸ßʱ£¬¾§Õ¢¹ÜµÄ´¥·¢µçÁ÷ËæÎ¶ÈÉý¸ß¶ø¼õС£¬Õý·´Ïò©µçÁ÷ËæÎ¶ÈÉý¸ß¶øÔö´ó£¬Î¬³ÖµçÁ÷IH»á¼õС£¬ÕýÏòתÕÛµçѹºÍ·´Ïò»÷´©µçÑ¹ËæÎ¶ÈÉý¸ß¶ø¼õС¡£

2.4¾§Õ¢¹ÜµÄ·ÇÕý³£µ¼Í¨·½Ê½ÓÐÄļ¸ÖÖ£¿

´ð£º·ÇÕý³£µ¼Í¨·½Ê½ÓУº(1) Ig=0£¬Ñô¼«µçѹÉý¸ßÖÁÏ൱¸ßµÄÊýÖµ£»(1) Ñô¼«µçѹÉÏÉýÂÊdu/dt¹ý¸ß£»(3) ½áιý¸ß¡£

2.5Çë¼òÊö¾§Õ¢¹ÜµÄ¹Ø¶Ïʱ¼ä¶¨Òå¡£

´ð£º¾§Õ¢¹Ü´ÓÕýÏòÑô¼«µçÁ÷ϽµÎªÁãµ½Ëü»Ö¸´ÕýÏò×è¶ÏÄÜÁ¦ËùÐèµÄÕâ¶Îʱ¼ä³ÆÎª¹Ø¶Ïʱ¼ä¡£¼´

tq?trr?tgr¡£

2.6ÊÔ˵Ã÷¾§Õ¢¹ÜÓÐÄÄЩÅÉÉúÆ÷¼þ£¿

´ð£º¿ìËÙ¾§Õ¢¹Ü¡¢Ë«Ïò¾§Õ¢¹Ü¡¢Äæµ¼¾§Õ¢¹Ü¡¢¹â¿Ø¾§Õ¢¹ÜµÈ¡£ 2.7Çë¼òÊö¹â¿Ø¾§Õ¢¹ÜµÄÓйØÌØÕ÷¡£

´ð£º¹â¿Ø¾§Õ¢¹ÜÊÇÔÚÆÕͨ¾§Õ¢¹ÜµÄÃż«Çø¼¯³ÉÁËÒ»¸ö¹âµç¶þ¼«¹Ü£¬ÔÚ¹âµÄÕÕÉäÏ£¬¹âµç¶þ¼«¹ÜµçÁ÷Ôö¼Ó£¬´ËµçÁ÷±ã¿É×÷ΪÃż«µç´¥·¢µçÁ÷ʹ¾§Õ¢¹Ü¿ªÍ¨¡£Ö÷ÒªÓÃÓÚ¸ßѹ´ó¹¦Âʳ¡ºÏ¡£

2.8ÐͺÅΪKP100-3£¬Î¬³ÖµçÁ÷IH=4mAµÄ¾§Õ¢¹Ü£¬Ê¹ÓÃÔÚͼÌâ2.8Ëùʾµç·ÖÐÊÇ·ñºÏÀí£¬ÎªÊ²Ã´?(Ôݲ»¿¼ÂǵçѹµçÁ÷Ô£Á¿)

12

ͼÌâ2.8

´ð£º£¨a£©ÒòΪIA?(b)IA?100V?2mA?IH£¬ËùÒÔ²»ºÏÀí¡£

50K?200V?20A, KP100µÄµçÁ÷¶î¶¨ÖµÎª100£Á£¬Ô£Á¿´ï£µ±¶£¬Ì«´óÁË¡£ 10?150V£¨c£©IA??150A£¬´óÓڶֵ£¬ËùÒÔ²»ºÏÀí¡£

1?2.9 ͼÌâ2.9ÖÐʵÏß²¿·Ö±íʾÁ÷¹ý¾§Õ¢¹ÜµÄµçÁ÷²¨ÐΣ¬Æä×î´óÖµ¾ùΪIm£¬ÊÔ¼ÆËã¸÷ͼµÄµçÁ÷ƽ¾ùÖµ£®µçÁ÷ÓÐЧֵºÍ²¨ÐÎϵÊý¡£

ͼÌâ2£®9

1½â£ºÍ¼(a)£º IT(AV)=

2?1IT=

2?Kf=

??0?0Imsin?td(?t)=

Im?

?(Imsin?t)2d(?t)=

Im 2ITIT(AV)?=1.57

1ͼ(b)£º IT(AV)=

??0Imsin?td(?t)=

2Im ? 13

IT=

1???0(Imsin?t)2d(?t)=

Im2

Kf=

ITIT(AV)1?=1.11

ͼ(c)£º IT(AV)=

???3Imsin?td(?t)=

3Im 2?IT=

1????3(Imsin?t)2d(?t)= Im

13??0.63Im 38?Kf=

ITIT(AV)=1.26

1ͼ(d)£º IT(AV)=

2?IT=

???3Imsin?td(?t)=

3Im 4?12????3(Imsin?t)2d(?t)= Im

13??0.52Im 66?Kf=

ITIT(AV)=1.78

1ͼ(e)£º IT(AV)=

2????40Imd(?t)=

Im 8Im22

1IT=

2?Kf=

?40Imd(?t)=

2ITIT(AV)=2.83

1ͼ(f)£º IT(AV)=

2????20Imd(?t)=

Im 4Im 21IT=

2?Kf=

?20Imd(?t)=

2ITIT(AV)=2

2.10ÉÏÌâÖУ¬Èç²»¿¼Âǰ²È«Ô£Á¿£¬ÎʶµçÁ÷100AµÄ¾§Õ¢¹ÜÔÊÐíÁ÷¹ýµÄƽ¾ùµçÁ÷·Ö±ðÊǶàÉÙ?

14

½â£º(a)ͼ²¨ÐÎϵÊýΪ1.57£¬ÔòÓУº 1.57?IT(AV)=1.57?100A , IT(AV) = 100 A

(b)ͼ²¨ÐÎϵÊýΪ1.11£¬ÔòÓУº 1.11?IT(AV)=1.57?100A , IT(AV)=141.4A (c)ͼ²¨ÐÎϵÊýΪ1.26£¬ÔòÓУº 1.26?IT(AV)=1.57?100A , IT(AV)=124.6A (d)ͼ²¨ÐÎϵÊýΪ1.78£¬ÔòÓУº 1.78?IT(AV)=1.57?100A , IT(AV)=88.2A (e)ͼ²¨ÐÎϵÊýΪ2.83£¬ÔòÓУº 2.83?IT(AV)=1.57?100A, IT(AV)=55.5A (f)ͼ²¨ÐÎϵÊýΪ2£¬ÔòÓУº 2?IT(AV)=1.57?100A , IT(AV)=78.5A 2.11ij¾§Õ¢¹ÜÐͺŹæ¸ñΪKP200-8D£¬ÊÔÎÊÐͺŹæ¸ñ´ú±íʲôÒâÒå?

½â£ºKP´ú±íÆÕͨÐ;§Õ¢¹Ü£¬200´ú±íÆä¾§Õ¢¹ÜµÄ¶î¶¨µçÁ÷Ϊ200A£¬8´ú±í¾§Õ¢¹ÜµÄÕý·´Ïò·åÖµµçѹΪ800V£¬D´ú±í̬ͨƽ¾ùѹ½µÎª0.6V?UT?0.7V¡£

2.12

ÈçͼÌâ2.12Ëùʾ£¬ÊÔ»­³ö¸ºÔØRdÉϵĵçѹ²¨ÐÎ(²»¿¼ÂǹÜ×ӵĵ¼Í¨Ñ¹½µ)¡£

ͼÌâ2.12 ½â£ºÆä²¨ÐÎÈçÏÂͼËùʾ£º

2.13ÔÚͼÌâ2.13ÖУ¬ÈôҪʹÓõ¥´ÎÂö³å´¥·¢¾§Õ¢¹ÜTµ¼Í¨£¬Ãż«´¥·¢Ðźţ¨´¥·¢µçѹΪÂö³å£©

15