{"id":690,"date":"2022-03-09T22:00:00","date_gmt":"2022-03-09T14:00:00","guid":{"rendered":"http:\/\/powerquality.sg\/wordpress\/?p=690"},"modified":"2022-03-10T02:29:55","modified_gmt":"2022-03-09T18:29:55","slug":"voltage-dip-09-03-2022-610pm","status":"publish","type":"post","link":"https:\/\/powerquality.sg\/wordpress\/?p=690","title":{"rendered":"Voltage Dip 09\/03\/2022 6:10PM"},"content":{"rendered":"\n

A voltage dip was reported in the Jurong-Pioneer area at around 6:10PM, due to a 22kV cable fault. <\/p>\n\n\n\n

Our office, a 15-20mins drive away (Jurong East – Boon Lay Way) recorded a drop in voltages of about 13% (from 420V to 366.5V) or about 8% (if referred to nominal voltage of 400V), as seen below.<\/p>\n\n\n\n

\"\"<\/a>
Measured at 400V (Line to Line)<\/figcaption><\/figure>\n\n\n\n

One may wonder how could a fault in Pioneer area affects the voltages in Jurong East? <\/p>\n\n\n\n

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\n\n\n

Based on past experiences, for a voltage disturbance of about -10% to be seen at another 22kV network, it will need to be a significant fault causing a voltage dip in the range of 70-80% in the fault area. <\/p>\n\n\n\n

Our office is in another 22kV network, which is connected to the fault area via the 66kV network path, as illustrated below.<\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n

Such drop in voltages usually do not cause much problem(s) to the equipment-end (especially typical office loads), as observed in the following Irms trends during this voltage disturbance.<\/p>\n\n\n\n

\"\"<\/a>
Vrms \/ Irms Trends During the Event<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"

A voltage dip was reported in the Jurong-Pioneer area at around 6:10PM, due to a 22kV cable fault. Our office, a 15-20mins drive away (Jurong East – Boon Lay Way) recorded a drop in voltages of about 13% (from 420V to 366.5V) or about 8% (if referred to nominal voltage of 400V), as seen below. […]<\/p>\n","protected":false},"author":1,"featured_media":204,"comment_status":"closed","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":"","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":"https:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2014\/03\/fig1-definition.png","jetpack_shortlink":"https:\/\/wp.me\/p41TEZ-b8","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/powerquality.sg\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/690"}],"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=690"}],"version-history":[{"count":3,"href":"https:\/\/powerquality.sg\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/690\/revisions"}],"predecessor-version":[{"id":695,"href":"https:\/\/powerquality.sg\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/690\/revisions\/695"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/powerquality.sg\/wordpress\/index.php?rest_route=\/wp\/v2\/media\/204"}],"wp:attachment":[{"href":"https:\/\/powerquality.sg\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=690"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/powerquality.sg\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=690"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/powerquality.sg\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=690"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}