{"id":888,"date":"2025-10-16T00:05:00","date_gmt":"2025-10-15T16:05:00","guid":{"rendered":"https:\/\/powerquality.sg\/wordpress\/?p=888"},"modified":"2025-12-28T01:28:34","modified_gmt":"2025-12-27T17:28:34","slug":"underfrequency-15-10-2025-417pm","status":"publish","type":"post","link":"http:\/\/powerquality.sg\/wordpress\/?p=888","title":{"rendered":"Underfrequency &#8211; 15\/10\/2025 4:17PM"},"content":{"rendered":"\n<p>My home&#8217;s PQube 3 detected a frequency violation (as low as 49.20Hz) at 4:17PM.<br><br>Note: Trigger threshold was set at 49.75Hz. Hence don&#8217;t be too alarmed with the duration of 3005 seconds.<br><br>Nominal system frequency for Singapore is +\/-1% of 50Hz (49.5Hz &#8211; 50.5Hz)<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"http:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2025\/10\/15-10-2025-1617-uf.jpg\"><img decoding=\"async\" loading=\"lazy\" width=\"959\" height=\"478\" src=\"http:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2025\/10\/15-10-2025-1617-uf.jpg\" alt=\"\" class=\"wp-image-889\" srcset=\"http:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2025\/10\/15-10-2025-1617-uf.jpg 959w, http:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2025\/10\/15-10-2025-1617-uf-300x150.jpg 300w, http:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2025\/10\/15-10-2025-1617-uf-768x383.jpg 768w\" sizes=\"(max-width: 959px) 100vw, 959px\" \/><\/a><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2025\/10\/15-10-2025-fre.jpg\"><img decoding=\"async\" loading=\"lazy\" width=\"991\" height=\"354\" src=\"https:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2025\/10\/15-10-2025-fre.jpg\" alt=\"\" class=\"wp-image-890\" srcset=\"http:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2025\/10\/15-10-2025-fre.jpg 991w, http:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2025\/10\/15-10-2025-fre-300x107.jpg 300w, http:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2025\/10\/15-10-2025-fre-768x274.jpg 768w\" sizes=\"(max-width: 991px) 100vw, 991px\" \/><\/a><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>Time-line wise, it generally matched the power outage that affected parts of Malaysia&#8217;s Klang Valley and Johor Bahru (due to an incident at a power plant in Melaka), as reported by AsiaOne and The EdgeMalaysia.<\/p>\n\n\n\n<p>&#8220;The outage at Edra Melaka Power Plant, owned by independent power producer Edra Power Holdings Sdn Bhd, took out supply capacity equivalent to over 10% of Peninsular Malaysia&#8217;s maximum electricity demand and resulted in blackouts across Kepong, Kuala Lumpur and Johor Bahru for more than an hour&#8221; &#8211; TheEdgeMalaysia<\/p>\n\n\n\n<p>Singapore is connected to Peninsular Malaysia at 230kV.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.asiaone.com\/malaysia\/johor-klang-valley-blackout-power-outage-tnb-oct-15\">https:\/\/www.asiaone.com\/malaysia\/johor-klang-valley-blackout-power-outage-tnb-oct-15<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/theedgemalaysia.com\/node\/774255\">https:\/\/theedgemalaysia.com\/node\/774255<\/a><\/p>\n\n\n\n<p>Contribution from a fellow LinkedIn user:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2025\/12\/LinkedIn-comment.jpg\"><img decoding=\"async\" loading=\"lazy\" width=\"1024\" height=\"584\" src=\"https:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2025\/12\/LinkedIn-comment-1024x584.jpg\" alt=\"\" class=\"wp-image-911\" srcset=\"http:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2025\/12\/LinkedIn-comment-1024x584.jpg 1024w, http:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2025\/12\/LinkedIn-comment-300x171.jpg 300w, http:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2025\/12\/LinkedIn-comment-768x438.jpg 768w, http:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2025\/12\/LinkedIn-comment.jpg 1146w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>My home&#8217;s PQube 3 detected a frequency violation (as low as 49.20Hz) at 4:17PM. Note: Trigger threshold was set at 49.75Hz. Hence don&#8217;t be too alarmed with the duration of 3005 seconds. Nominal system frequency for Singapore is +\/-1% of 50Hz (49.5Hz &#8211; 50.5Hz) Time-line wise, it generally matched the power outage that affected parts [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":589,"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":[13],"tags":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"http:\/\/powerquality.sg\/wordpress\/wp-content\/uploads\/2021\/08\/pqmonitoring.png","jetpack_shortlink":"https:\/\/wp.me\/p41TEZ-ek","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"http:\/\/powerquality.sg\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/888"}],"collection":[{"href":"http:\/\/powerquality.sg\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/powerquality.sg\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/powerquality.sg\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/powerquality.sg\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=888"}],"version-history":[{"count":7,"href":"http:\/\/powerquality.sg\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/888\/revisions"}],"predecessor-version":[{"id":912,"href":"http:\/\/powerquality.sg\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/888\/revisions\/912"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/powerquality.sg\/wordpress\/index.php?rest_route=\/wp\/v2\/media\/589"}],"wp:attachment":[{"href":"http:\/\/powerquality.sg\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=888"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/powerquality.sg\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=888"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/powerquality.sg\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=888"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}