¡¶¹©Åäµç¼¼Êõ¡·ÌÆÖ¾Æ½µÚÈý°æÏ°Ìâ´ð°¸£¨È«£© ÏÂÔØ±¾ÎÄ

Pc1?Kd1Pe1?0.8?60kW?48kWQc1?Pc1tan?1?48?1.73kvar?83.04kvar

µãº¸»úKd2?0.35,cos?2?0.6,tan?2?1.33

Pe2??2PN2?0.65?10.5kW?8.47kWPc2?Kd2Pe2?0.35?8.47kW?2.96kWQc2?Pc2tan?2?2.96?1.33kvar?3.94kvarÓÐÁ¬ËøµÄÁ¬ÐøÔËÊä»úеKd3?0.7,cos?3?0.75,tan?3?0.88

Pc3?Kd3Pe3?0.7?40kW?28kWQc3?Pc3tan?3?28?0.88kvar?24.64kvarÐгµKd4?0.15,cos?4?0.5,tan?4?1.73

Pe4??4PN4?0.15?10.2kW?3.95kWPc4?Kd4Pe4?0.15?3.95kW?0.59kWQc4?Pc4tan?4?0.59?1.73kvar?1.03kvarͬʱϵÊýÈ¡K?p,K?q?0.9 ³µ¼ä¼ÆË㸺ºÉΪ£º

Pc?K?p?Pci?0.9?(48?2.96?28?0.59)kW?71.60kWQc?K?q?Pci?0.9?(83.04?3.94?24.64?1.03)kvar?101.39kvarSc?Pc2?Qc2?124.12kVAIc?Sc3UN?124.12A?179.16A30.4

2-21 ij³µ¼äÉèÓÐСÅúÁ¿Éú²úÀä¼Ó¹¤»ú´²µç¶¯»ú40̨£¬×ÜÈÝÁ¿152kW£¬ÆäÖнϴóÈÝÁ¿µÄµç¶¯»úÓÐ10kW 1̨¡¢7kW 2̨¡¢4.5kW 5̨¡¢2.8kW 10̨£»ÎÀÉúÓÃͨ·ç»ú6̨¹²6kW¡£ÊÔ·Ö±ðÓÃÐèҪϵÊý·¨ºÍ¶þÏîʽ·¨Çó³µ¼äµÄ¼ÆË㸺ºÉ¡£ ½â£ºÐèҪϵÊý·¨£º²é±íA-1¿ÉµÃ£º

Àä¼Ó¹¤»ú´²£º Kd1?0.2,cos?1?0.5,tan?1?1.73

Pc1?0.2?15k2W?Qc1?30.4?1.k7W3?30.kW45k2.W6

,cos?2?0.8,tan?2?0.75 ͨ·ç»ú×飺Kd2?0.8?

Pc2?0.8?6kW?4.8kWQc2?4.8?0.75kW?3.6kW

³µ¼äµÄ¼ÆË㸺ºÉ:

Pc?0.9??30.4?4.8?kW?31.68kWQc?0.9??52.6?4.8?kW?50.58kWSc?Pe? Qe?59.68kVAIce? Se3UN?59.68/(1.732?0.38)?90.7A¶þÏîʽ·¨: ²é±íA-1¿ÉµÃ£º

Àä¼Ó¹¤»ú´²:b1?0.14,c1?0.4,x1?5,cos?1?0.5,tan?1?1.73

22

(bPe?)1?0.14?152kW?21.28kW?cPx?1?0.4??10?7?2?2?4.5?kW?13.2kWÒòΪn=6£¼2x2 ,È¡x2=3.Ôò

ͨ·ç»ú×é:b2?0.65,c2?0.25,x2?5,cos?2?0.8,tan?2?0.75

(bPe?)2?0.65?6kW?3.9kW?cPx?2?0.25?3kW?0.75kW

ÏÔÈ»ÔÚ¶þ×éÉ豸ÖÐ µÚÒ»×鸽¼Ó¸ººÉ(cPx)1×î´ó ¹Ê×ܼÆË㸺ºÉΪ£º

Pc?(21.28?3.9?13.2kW)?38.38kWQc?£¨21.28?1.73?3.9?0.75?13.2?1.73)kvar?62.56kvarSc?Pe2? Qe2?73.4kVAIc? Se/(3UN)?111.55A

2-22 ij220/380VÈýÏàËÄÏßÖÆÏß·ÉϽÓÓÐÏÂÁиººÉ£º220V 3kWµçÈÈÏä2̨½ÓÓÚAÏ࣬6kW1̨½ÓÓÚBÏ࣬4.5kW 1̨½ÓÓÚCÏࣻ380V 20kW£¨?=65%£©µ¥Í·ÊÖ¶¯»¡º¸»ú1̨½ÓÓÚABÏ࣬6kW£¨?=10%£©3̨½ÓÓÚBCÏ࣬10.5kW£¨?=50%£©2̨½ÓÓÚCAÏà¡£ÊÔÇó¸ÃÏß·µÄ¼ÆË㸺ºÉ¡£ ½â£º£¨1£©µçÈÈÏäµÄ¸÷Ïà¼ÆË㸺ºÉ ²é±íA-1µÃ£¬Kd?0.7,cos??1,tan??0£¬Òò´Ë¸÷ÏàµÄÓй¦¼ÆË㸺ºÉΪ£º AÏà PcA1?KdPeA?0.7?3?2kW?4.2kW BÏà PcB1?KdPeB?0.7?6?1kW?4.2kW CÏà PcC1?KdPeC?0.7?4.5?1kW?3.15kW £¨2£©µ¥Í·ÊÖ¶¯»¡º¸»úµÄ¸÷Ïà¼ÆË㸺ºÉ

²é±íA-1µÃ£¬Kd?0.35,cos??0.35,tan??2.68£»²é±í2-4µÃ£¬cos??0.35ʱ£¬Ôò

pAB?A?pBC?B?pCA?C?1.27pAB?B?pBC?C?pCA?A??0.27qAB?A?qBC?B?qCA?C?1.05qAB?B?qBC?C?qCA?A?1.63½«¸÷Ïà»»Ëã³É??100%µÄÉ豸ÈÝÁ¿£¬¼´£º

PAB??N1PN1?0.65?20kW?16.12kWPBC??N2PN2?0.1?6?3kW?5.69kWPCA??N3PN3?0.5?10.5?2kW?14.85kW¸÷ÏàµÄÉ豸ÈÝÁ¿Îª AÏà

PeA?pAB?APAB?pCA?APCA?[1.27?16.12?(?0.27?14.85)]kW?16.46kWQeA?qAB?APAB?qCA?APCA?(1.05?16.12?1.63?14.85)kW?41.13kvarPeB?pBC?BPBC?pAB?BPAB?[1.05?5.69?(?0.27)?16.12]?1.62kWQeB?qBC?BPBC?qAB?BPAB?(1.27?5.69?1.63?16.12)kvar?33.50kvarPeC?pCA?CPCA?pBC?CPBC?[1.27?14.85?(?0.27)?5.69]kW?17.32kWQeC?qCA?CPCA?qBC?CPBC?(1.05?14.85?1.63?5.69)kvar?24.87kvarPcA2?KdPeA?0.7?16.46kW?11.52kWQcA2?KdQeA?0.7?41.13kvar?28.79kWPcB2?KdPeB?0.7?1.62kW?1.13kWQcB2?KdQeB?0.7?33.50kvar?23.45kWPcC2?KdPeC?0.7?17.32kW?12.12kWQcC2?KdQeC?0.7?24.87kvar?17.41kW

BÏà

CÏà

¸÷ÏàµÄ¼ÆË㸺ºÉΪ AÏà

BÏà

CÏà

£¨3£©¸÷Ïà×ܵļÆË㸺ºÉΪ£¨ÉèͬʱϵÊýΪ0.95£© AÏà

PcA?K?(PcA1?PcA2)?0.95?(4.2?11.52)kW?14.93kWQcA?K?(QcA1?QcA2)?0.95?(0?28.79)kW?27.35kWPcB?K?(PcB1?PcB2)?0.95?(4.2?1.62)kW?5.53kWQcB?K?(QcB1?QcB2)?0.95?(0?33.50)kW?31.83kW

BÏà

CÏà

PcC?K?(PcC1?PcC2)?0.95?(3.15?12.12)kW?14.51kWQcC?K?(QcC1?QcC2)?0.95?(0?17.41)kW?16.54kW

£¨4£©×ܵĵÈЧÈýÏà¼ÆË㸺ºÉ

ÒòΪAÏàµÄÓй¦¼ÆË㸺×î´ó£¬ËùÒÔPc?m?PcA?14.93kW,Qc?m?QcA?27.35kvar£¬Ôò

Pc?3Pc?m?3?14.93kW?44.79kWQc?3Qc?m?3?27.35kvar?82.05kvarSc?44.792?82.052KVA?93.48KVA Ic?Sc3UN?93.48A?142.03A3?0.38

2-23 ij³§»úе¹¤³µ¼ä±äµçËù¹©µçµçѹ10kV£¬µÍѹ²à¸ººÉÓµÓнðÊôÇÐÏ÷»ú´²ÈÝÁ¿¹²920kW£¬Í¨·ç»úÈÝÁ¿¹²56kW£¬ÆðÖØ»úÈÝÁ¿¹²76kW£¨?=15%£©,ÕÕÃ÷¸ººÉÈÝÁ¿42kW£¨°×³ãµÆ£©£¬Ïß·¶î¶¨µçѹ380V¡£ÊÔÇó£º

£¨1£©¸Ã³µ¼ä±äµçËù¸ßѹ²à£¨10kV£©µÄ¼ÆË㸺ºÉPc,Qc,Sc,Ic¼°cos?

£¨2£©Èô³µ¼ä±äµçËùµÍѹ²à½øÐÐ×Ô¶¯²¹³¥£¬¹¦ÂÊÒòÊý²¹³¥µ½0.95£¬Ó¦×°BW0.4-28-3Ð͵çÈÝÆ÷¶àÉŲ̀£¿

£¨3£©²¹³¥ºó³µ¼ä¸ßѹ²àµÄ¼ÆË㸺ºÉPc,Qc,Sc,Ic¼°cos?£¬¼ÆËãÊÓÔÚ¹¦ÂʼõС¶àÉÙ£¿ ½â£º£¨1£©²é±íA-1

Kd1?0.2,cos?1?0.5,tan?1?1.73СÅúÁ¿½ðÊôÇÐÏ÷»ú´²£ºPc1?Kd1Pe1?0.2?920kW?184kW

Qc1?Pc1tan?1?184?1.73kvar?318.32kvarKd2?0.8,cos?2?0.8,tan?2?0.75ͨ·ç»ú£º Pc2?Kd2Pe2?0.8?56kW?44.8kW

Qc2?Pc2tan?2?44.8?0.75kvar?33.6kvarKd3?0.2,cos?3?0.5,tan?3?1.73ÆðÖØ»ú£º Pc3?2Kd3?3Pe3?0.4?0.15?76kW?11.78kW

Qc3?Pc3tan?3?11.78?1.73kvar?20.38kvarÕÕÃ÷£º

Pc4?42kWQc1?0kvar

×ܵļÆË㸺ºÉΪ£¨ÉèͬʱϵÊýΪ0.95£©

Pc?K?(Pc1?Pc2?Pc3?Pc4)?0.95?(184?44.8?11.78?42)kW?268.45kWQc?K?(Qc1?Qc2?Qc3?Qc4)?0.95?(318.32?33.6?20.38?0)kvar?353.69kvarSc?Pc2?Qc2?444.03kVAcos?1?Pc?0.60Sc

±äѹÆ÷µÄ¹¦ÂÊËðºÄΪ

?PT?0.015Sc?0.015?444.03kW?6.66kW?QT?0.06Sc?0.06?444.03kvar?26.64kvar