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它是由镇æµå™¨ï¼Œè§¦å‘å™¨å’Œç¯æºç»„æˆã€‚镇æµå™¨å’Œä¸åŒåŠŸçŽ‡çš„å…‰æºé…åˆä½¿ç”¨ã€‚在电路中起扼æµä½œç”¨ã€‚镇æµå™¨çš„电感é‡ä¸Žå¯¼çº¿çš„åŒæ•°ã€æ°”隙的长度ã€é“芯的é¢ç§¯æœ‰å…³ã€‚一旦制æˆå³ä¸ºä¸€ä¸ªå¸¸æ•°ã€‚高压钠ç¯éšç€ä½¿ç”¨æ—¶é—´çš„增加,ç¯ç®¡è¡°è€ï¼Œç¯ç®¡çš„等效阻抗增大,在相åŒä¾›ç”µæ¡ä»¶ä¸‹ï¼Œç”µè·¯å·¥ä½œç”µæµä¸‹é™ï¼Œç¯ç®¡ç®¡ç”µåŽ‹ä¸Šå‡ã€‚当ç¯ç”µæµä¸‹é™åˆ°å°äºŽç‚¹äº®ç¯æ‰€éœ€çš„ç»´æŒç”µæµæ—¶ï¼Œç¯å°±è‡ªç†„。ç¯ç”µæµã€ç¯ç®¡ç”µåŽ‹ä¸Žç¯ä½¿ç”¨æ—¶é—´å…³ç³»å¦‚下: </P> <P align=center><IMG alt=ç¯ç”µæµ?电压与使用时间关系表 src="/uploadfile/20101201/20101201120833301.jpg" border=0><BR>ç¯ç”µæµã€ç”µåŽ‹ä¸Žä½¿ç”¨æ—¶é—´å…³ç³»è¡?<BR>一般ç¯ç”µæµä¸‹é™åˆ°é¢å®šå€?5%左峿—¶å°±ä¼šäº§ç”Ÿè‡ªç†„现象ã€?</P> <P><BR><BR>  光æºåœ¨ä¸åŒçš„使用时段,å³ä½¿åœ¨ç›¸åŒçš„æ¡ä»¶ä¸‹å®žé™…å‘光功率也ä¸åŒã€‚å…‰æºä½¿ç”¨æ—¶é—´ä¸Žå…‰æºå®žé™…å‘å…‰åŠŸçŽ‡å…³ç³»æµ‹è¯•ç”µè·¯åŠæµ‹è¯•æ•°æ®å¦‚下,测试æ¡ä»¶æ˜¯ä¿æŒä¾›ç”µç”µåŽ‹ä¸º220V,电路器æé‡‡ç”¨GE400Wæˆå¥—é’ ç¯å™¨æï¼Œç ”ç©¶å…‰æºä¸åŒä½¿ç”¨æ—¶é—´ç”µè·¯å‚æ•°å˜åŒ–情况。其中U1为电æºè¾“入电压ã€I1电路输入电æµï¼ŒP1为电路输入功çŽ?å«é•‡æµå™¨æŸè€?,COSφ1为末加补å¿ç”µå®¹æ—¶ç”µè·¯çš„功率因数。U2ã€ä¸ºç¯ç®¡ä¸¤ç«¯çš„压é™ï¼ŒI2为ç¯ç®¡ç”µæµï¼ŒP2为ç¯ç®¡å–用功率,COSφ2为ç¯ç®¡åŠŸçŽ‡å› æ•°ï¼ŒUL为镇æµå™¨ä¸¤ç«¯ç”µåŽ‹ã€?/P> <P align=center><IMG alt=气体放电ç¯ç”µè·¯å‚数测试电路图 src="/uploadfile/20101201/20101201120929944.jpg" border=0><BR>图二 ç”µè·¯å‚数测试电路å›?</P> <P>  光æºä½¿ç”¨åˆæœŸï¼Œå…‰æºçš„等效阻抗ä¸?8.35Ω,功率因数角ä¸?9.4o其输出功率并ä¸å¤§ï¼Œå®žé™…功率为é¢å®šåŠŸçŽ‡90%å·¦å³ã€?<BR>  光æºä½¿ç”¨ä¸­æœŸï¼Œå…¶è¾“出功率已超过é¢å®šå€¼ï¼Œå…‰æºçš„等效阻抗为37.88Ω,功率因数角ä¸?3.6o,输出功率已超过é¢å®šå€¼ï¼Œå³°å€¼åŠŸçŽ‡ä¼šè¶…è¿‡é¢å®šå€?0%å·¦å³ã€?nbsp;超功率使用会加速光æºè€åŒ–ã€?BR>  光æºä½¿ç”¨æœ«æœŸï¼?nbsp;å…‰æºçš„等效阻抗上å‡ä¸º47.60Ω,功率因数角ä¸?7.7o。实际功率为é¢å®šåŠŸçŽ‡90%å·¦å³ã€?<BR>  从功率特性曲线分æžï¼Œåœ¨å…‰æºçš„生命周期内,å³ä½¿ä¾›ç”µç”µåŽ‹å¾ˆæ ‡å‡†ï¼Œä¹Ÿæœ‰è¶…åŠŸçŽ‡è¿è¡ŒçŽ°è±¡å‘生,超功率使用会加速光æºè€åŒ–ã€?<BR>  光æºçš„使用寿命指标是在é¢å®šä½¿ç”¨æ¡ä»¶ä¸‹å®šä¹‰çš?其使用æ¡ä»¶Ue+3%V~Ue-5%V,寿命指标为ï¼?0000-12000å°æ—¶ã€‚我国照明电压标称值为220V,正常工作电压范围为220±10%;å³ä»Ž198V-242V,而符åˆé«˜åދ钠ç¯ä½¿ç”¨æ¡ä»¶çš„电压值为209Vï½?26V。这ç§å离使用æ¡ä»¶çš„电压加速光æºçš„è€åŒ–,以至达ä¸åˆ°å…‰æºçš„é¢å®šä½¿ç”¨å¯¿å‘½ã€?<BR>  供电电压对光æºåŠŸçŽ‡å½±å“的实测电路和测试数æ®å¦‚ä¸?测试电路åŒå›¾äºŒã€?<BR><BR>ã€€ã€€åˆ†æžæ•°æ®å¯çŸ¥ï¼?20Væ—¶å…‰æºåŠŸçŽ‡ä¸º400Wï¼?45Væ—¶P2功率ä¸?11W,超出é¢å®šåŠŸçŽ?7.75%。针对我国国情,下åŠå¤œä¾›ç”µç”µåŽ‹è¶…å‡?40V的现象很普é,供电电æºå高使光æºåŠŸçŽ‡æ€¥å‰§å¢žåŠ ï¼ŒåŠ é€Ÿç¯ç®¡çš„è€åŒ–,大大缩短了光æºçš„使用寿命ã€?<BR>  一åªè·¯ç¯æŽ§åˆ¶æŸœå¾€å¾€è¦æŽ§åˆ¶ä¸Šç™¾ç›è·¯ç¯ï¼ŒæŽ§åˆ¶è·ç¦»ä¸€å…¬é‡Œç”šè‡³æ›´é•¿ã€‚考虑到线路压é™ï¼ŒæŽ§åˆ¶æŸœçš„出线电压会高于é¢å®šå€¼ã€‚一般首末端电压差会达到15Vå·¦å³ã€‚如果补å¿ä¸åˆ°ä½ï¼Œçº¿è·¯ç”µæµå¢žå¤§ï¼ŒåŽ‹å·®ä¼šæ›´å¤§ï¼Œå„ç›ç¯çš„供电电压就å„ä¸ç›¸ç­‰ï¼Œå…‰æºçš„è€åŒ–程度ä¸ä¸€ï¼Œå¯¼è‡´ç¦»æ•£æ€§è‡ªç†„。为ä¿è¯äº®ç¯çŽ‡ã€‚å¿…é¡»éš”ä¸‰å·®äº”æ›´æ¢å…‰æºã€‚给路ç¯ç®¡ç†å¸¦æ¥è¯¸å¤šä¸ä¾¿ã€?<BR>  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