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    ¹è°üÇǺ¹¼Õ»ó ŽÁöÀåºñ , ¸Å¼³¹è°üÀÇ Á¤¹Ð ÇǺ¹ ¼Õ»ó ŽÃø¿ë, ,DCVG
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    In theory, a standard analogue electronic multimeter could be used to perform a DCVG survey, but in practice it would be very difficult to take accurate readings and assess the direction of the voltage gradients correctly.
     A digital multimeter is completely unsuitable because of the difficulty in quickly assessing the direction of the voltage gradient. Specially designed DCVG meters are available, which have bespoke voltage ranges,
    specially designed transient response, rugged cases and (usually) a centre-zero meter movement for ease of use. The NACE method requires the measurements to be made using a pair of copper-copper
    (II)
    sulfate electrodes rather than simple metallic probes. In addition, the cathodic protection is switched on and off repeatedly using an electronic switch commonly referred to as an interrupter.
    Thus, two voltage readings (the "on" and "off" potentials) are taken at each fault position. Counter-intuitively, it is actually the "off" potential which is regarded as more indicative of the effectiveness of the CP applied to the pipeline.
     
    Pipelines which do not have any form of CP may be surveyed by using a temporary DC supply and anode bed. Long pipelines frequently have more than one DC supply for their CP,
     requiring a number of synchronised interrupters to perform a survey. DCVG surveys are often combined with other techniques, such as close interval potential survey and soil resistivity as part of a comprehensive corrosion protection program.
     
    Results of a DCVG survey often result in selecting locations to excavate pipelines, which can be costly in urban areas. Collection of data and interpretation may be performed by pipeline companies themselves or, more usually, by independent specialists.


    ÀÌ·ÐÀûÀ¸·Î, ÀüÀÚ Ç¥ÁØ ¾Æ³¯·Î±× ¸ÖƼ ¹ÌÅÍ DCVG Á¶»ç¸¦ ¼öÇà ÇÒ ¼ö ÀÖÁö¸¸, ½ÇÁ¦·Î ÀÌ´Â Á¤È®ÇÑ Æǵ¶À» Á¤È®ÇÏ°Ô Àü¾Ð ±¸¹èÀÇ ¹æÇâÀ» Æò°¡ÇÏ´Â °ÍÀº ¸Å¿ì ¾î·Á¿ï °ÍÀÌ´Ù.
    µðÁöÅÐ ¸ÖƼ ¶§¹®¿¡ ½Å¼Ó Àü¾Ð ±¸¹èÀÇ ¹æÇâÀ» Æò°¡Çϴµ¥ ¾î·Á¿ò ¿ÏÀüÈ÷ ºÎÀûÇÕÇÏ´Ù.
    Ư¼ö ¼³°èµÈ DCVG ¹ÌÅÍ ¸ÂÃã Àü¾Ð ¹üÀ§, Ưº°È÷ µðÀÚÀÎ µÈ °úµµ ÀÀ´ä, °ß°íÇÑ ÄÉÀ̽º ¹× »ç¿ë ÆíÀǼº (º¸Åë) Á᫐ Á¦·Î ¹ÌÅÍÀÇ ¿òÁ÷ÀÓÀÌÀÖ´Â, »ç¿ëÇÒ ¼ö ÀÖ½À´Ï´Ù. NACE ¹ýÀº ÃøÁ¤ÀÌ ±¸¸® - ±¸¸® (II) ¼³ÆäÀÌÆ® Àü±Øº¸´Ù´Â ´Ü¼øÇÑ ±Ý¼Ó ÇÁ·Îºê ½ÖÀ» »ç¿ëÇÏ¿© Á¦Á¶ ÇÒ ÇÊ¿ä. ¶ÇÇÑ, À½±ØÀº ÀϹÝÀûÀ¸·Î¿¡ ¹Ýº¹Àû ÀÎÅÍ·´ÅÍ·Î ÁöĪ ÀüÀÚ ½ºÀ§Ä¡¸¦ »ç¿ëÇÏ¿© ½ºÀ§Ä¡ OFFµÈ´Ù. µû¶ó¼­, µÎ °³ÀÇ Àü¾Ð ( "ON"°ú "OFF"ÀüÀ§)
    ¼öÄ¡´Â °¢ °íÀå À§Ä¡¿¡¼­ °¡Á®¿É´Ï´Ù.
    ¹Ý Á÷°üÀûÀ¸·Î, ÀÌ°ÍÀº ½ÇÁ¦·Î ÆÄÀÌÇÁ ¶óÀο¡Àΰ¡ CPÀÇ È¿°ú ÀÌ»óÀ» ³ªÅ¸³»´Â °ÍÀ¸·Î °£Áֵȴ٠ÀüÀ§ "OFF".

    CPÀÇ ¾î¶² ÇüÅ°¡¾ø´Â ÆÄÀÌÇÁ ¶óÀÎ Àӽà DC °ø±Þ ¹× ¾Ö³ëµå ÃþÀ» »ç¿ëÇÏ¿© Á¶»ç ÇÒ ¼öÀÖ´Ù.
    ±ä ÆÄÀÌÇÁ´Â ÀÚÁÖ °Ë»ç¸¦ ¼öÇàÇÏ´Â µ¿±â ÀÎÅÍ·´ÅÍÀÇ ¼ö¸¦ ÇÊ¿ä·ÎÇÏ´Â ±× CP¿¡ ´ëÇØ Çϳª ÀÌ»óÀÇ DC °ø±Þ ÀåÄ¡¸¦ °¡Áö°íÀÖ´Ù.
    DCVG Á¶»ç´Â Á¾Á¾ Æ÷°ýÀû ÀÎ ºÎ½Ä ¹æÁö ÇÁ·Î±×·¥ÀÇ ÀÏȯÀ¸·Î °¡±î¿î °£°Ý °¡´É¼º Á¶»ç ¹× Åä¾ç ÀúÇ×°ú °°Àº ´Ù¸¥ ±â¼ú°ú °áÇյ˴ϴÙ.

    DCVG ¼³¹® Á¶»çÀÇ °á°ú´Â Á¾Á¾ µµ½Ã Áö¿ª¿¡ Ä¡¸íŸ°¡ µÉ ¼öÀÖ´Â ÆÄÀÌÇÁ ¶óÀÎÀ» ¹ß±¼ÇÏ´Â À§Ä¡¸¦ ¼±Åà ÃÊ·¡ÇÑ´Ù. µ¥ÀÌÅÍ¿Í Çؼ®ÀÇ Ä÷º​​¼ÇÀº µ¶¸³Àû ÀÎ Àü¹®°¡¿¡ ÀÇÇØ ÆÄÀÌÇÁ ¶óÀΠȸ»ç ´õ ÀϹÝÀûÀ¸·Î ÀÚ½ÅÀ̳ª,¿¡ ÀÇÇØ ¼öÇà µÉ ¼öÀÖ´Ù.

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