{"id":475,"date":"2019-07-19T11:51:36","date_gmt":"2019-07-19T03:51:36","guid":{"rendered":"http:\/\/powerquality.sg\/wordpress\/?p=475"},"modified":"2019-07-21T12:27:19","modified_gmt":"2019-07-21T04:27:19","slug":"voltage-dip-16-july-2019-444-pm","status":"publish","type":"post","link":"https:\/\/powerquality.sg\/wordpress\/?p=475","title":{"rendered":"Voltage Dip 16 July 2019 4:44 PM"},"content":{"rendered":"<p>Earlier in the week, areas in Tampines, Loyang, Bedok, Pasir Ris will have experienced voltage dips. It was made known later that it was due to a 22kV cable fault in Tampines area.<\/p>\n<p>Few sets of our portable PQ analyzers placed in Loyang was able to capture this event. It registered voltage dips (at low voltage) of about 20%, lasting around 60-80ms. Recorded data showed that it was a three-phase fault.<\/p>\n<p><a href=\"http:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2019\/07\/voltage-dip-160719-1644hrs.jpg\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-medium wp-image-476\" src=\"http:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2019\/07\/voltage-dip-160719-1644hrs-300x230.jpg\" alt=\"\" width=\"300\" height=\"230\" srcset=\"https:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2019\/07\/voltage-dip-160719-1644hrs-300x230.jpg 300w, https:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2019\/07\/voltage-dip-160719-1644hrs-768x589.jpg 768w, https:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2019\/07\/voltage-dip-160719-1644hrs-1024x786.jpg 1024w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>One may be curious, how could a fault in Tampines result in a voltage dip in places like in Loyang or Bedok?<\/p>\n<p>Our local distribution grid is densely interconnected, resulting in a high-reliability electricity network. Total blackouts are rare. But interconnectivity brings about a small disadvantage. Any fault will be seen\/felt (in the form of a voltage dip) by everyone who is connected. The seriousness of this dip will be dependent on the types of faults and the electrical distance between you and the fault point.<\/p>\n<p>Here in our case, the fault was in Tampines area. Based on experience, for a voltage dip ~ 20% to be seen at another 22kV network, it will need to be a significant fault causing a voltage dip in the range of 80-90% in the fault area (Tampines). Loyang (where our PQ analyzers were) is connected to Tampines at 66kV level.<\/p>\n<p><a href=\"http:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2019\/07\/voltage-dip-propagation.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-medium wp-image-477\" src=\"http:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2019\/07\/voltage-dip-propagation-293x300.png\" alt=\"\" width=\"293\" height=\"300\" srcset=\"https:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2019\/07\/voltage-dip-propagation-293x300.png 293w, https:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2019\/07\/voltage-dip-propagation.png 472w\" sizes=\"(max-width: 293px) 100vw, 293px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Earlier in the week, areas in Tampines, Loyang, Bedok, Pasir Ris will have experienced voltage dips. It was made known later that it was due to a 22kV cable fault in Tampines area. Few sets of our portable PQ analyzers placed in Loyang was able to capture this event. It registered voltage dips (at low [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_newsletter_tier_id":0,"jetpack_publicize_message":"Voltage Dip 16 July 2019 4:44 PM","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[10],"tags":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p41TEZ-7F","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/powerquality.sg\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/475"}],"collection":[{"href":"https:\/\/powerquality.sg\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/powerquality.sg\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/powerquality.sg\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/powerquality.sg\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=475"}],"version-history":[{"count":2,"href":"https:\/\/powerquality.sg\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/475\/revisions"}],"predecessor-version":[{"id":479,"href":"https:\/\/powerquality.sg\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/475\/revisions\/479"}],"wp:attachment":[{"href":"https:\/\/powerquality.sg\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=475"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/powerquality.sg\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=475"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/powerquality.sg\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=475"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}