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  Á¦  ¸ñ : (¹èÀü¼±·Î °íÀå¿¡ ÀÇÇÑ Voltage SagÀÇ Æ¯¼º Çؼ®)
  ±Û¾´ÀÌ : °ü¸®ÀÚ      µî·ÏÀÏ : 2007-03-31 16:36     Á¶È¸ : 15720    
  Æ®·¢¹é ÁÖ¼Ò : http://jsdata.co.kr/bbs/bbs/tb.php/sub_04_01/10
   49_1_¹èÀü¼±·Îsag(2001-1-KSU)¹Ìµî·Ï.hwp (158byte), Down : 22, 2007-03-31 16:36:51
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Characteristic Analysis of Voltage Sags Due to Faulted Distribution Lines
(¹èÀü¼±·Î °íÀå¿¡ ÀÇÇÑ Voltage SagÀÇ Æ¯¼º Çؼ®)

±è ¼º ´ö* ․ Madhat M. Morcos**
(Sung Duck, Kim ․ Madhat M. Morcos)

Abstract
Voltage sags caused by line faults in transmission and distribution lines have become
one of the most important power quality problems facing industrial customers and
utilities. Voltage sags are normally described by characteristics of both magnitude
and duration, but phase angle shifts should be taken account in identifying sag
phenomena and finding their solutions. In this paper, voltage sags due to line faults
such as three phase-to-ground, single line-to-ground, and line-to-line faults are
characterized by using symmetrical component analysis, for fault impedance variations.
Voltage sags and their effect on the magnitude and phase angle are examined. Balanced
sags of three phase-to-ground faults show that voltages and currents are changed with
equivalent levels to all phases and the zero sequence components become zero. However,
for unbalanced faults such as single line-to-ground and line-to-line faults, voltage
sags give different magnitude variations and phase angle shifts for each phase. In
order to verify the analyzed results, some simulations based on power circuit models
are also discussed.

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ÇÑ Àü·ÂÇ°Áú(power quality) ¹®Á¦µé Áß Çϳª°¡ µÇ¾ú´Ù. voltage sag´Â ÀϹÝÀûÀ¸·Î ÁøÆø°ú Áö
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¿µ»ó¼ººÐµéÀº ¿µÀÌ µÇ¾ú´Ù. ±×·¸Áö¸¸, ´Ü¼±Áö¶ô°ú ¼±°£´Ü¶ô °íÀå°ú °°Àº ºÒÆòÇü °íÀåÀ¸·Î ÀÎ
ÇÑ voltage sag´Â ÁøÆø°ú À§»óÀÌ °¢ »ó¸¶´Ù ´Ù¸£°Ô º¯È­µÇ¾ú´Ù. Çؼ®°á°ú¸¦ È®ÀÎÇϱâ À§ÇÏ¿©
Àü·Âȸ·Î ¸ðµ¨µéÀ» Åä´ë·Î ½Ã¹Ä·¹À̼ÇÀ» ¼öÇàÇÏ°í ±× °á°úµéµµ °ËÅäµÇ¾ú´Ù.
     PSL»ç ¾Ë·º½ºÈ¸Àå °³ÀΠȨÆäÀÌÁö
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°Ô½ÃÆÇÀÇ ÀڷḦ ã±â ¿øÇϽô ºÐ¾ß´Â ¿ÞÂÊ °Ô½ÃÆÇ ¸Þ´º¿¡¼­ ¼±ÅÃÇϽñ⠹ٶø´Ï´Ù.

¤· ÇÙ½É ±â¼ú (Àü±âÇ°Áú, ´©ÀüºÐ¼®, ÃàÀüÁö¼¿Áø´Ü) Á¦¾È, ¼¼¹Ì³ª ÀÚ·á ´Ù¿î·Îµå ¼­ºñ½º (2009.06 ¹öÀü)

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¤· ÀÚü Á¦ÀÛ µ¿¿µ»ó ¹Ù·Îº¸±â : ³×À̹ö Ä«Æä ¿¬°á

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