{"id":31721,"date":"2025-11-18T08:47:18","date_gmt":"2025-11-18T00:47:18","guid":{"rendered":"http:\/\/60.205.138.141\/?post_type=portfolio&p=31721"},"modified":"2026-01-04T14:30:54","modified_gmt":"2026-01-04T06:30:54","slug":"inaccurate-measurement-of-opening-and-closing-time-in-opening-and-closing-tests-setting-of-control-time-in-opening-and-closing-tests","status":"publish","type":"portfolio","link":"https:\/\/www.handy-tech.com\/en\/\u6280\u672f\u652f\u6301\/inaccurate-measurement-of-opening-and-closing-time-in-opening-and-closing-tests-setting-of-control-time-in-opening-and-closing-tests","title":{"rendered":"Inaccurate measurement of opening and closing time in opening and closing tests\/Setting of control time in opening and closing tests"},"content":{"rendered":"\n
    \n
  1. C\u2013O (Close\u2013Open) test settings
    On our high-voltage switch analyzer the \u201cC\u2013O control time\u201d is the interval between the rising edge of the CLOSE command pulse<\/strong> and the rising edge of the OPEN command pulse<\/strong> (in a reclosing sequence it is the instant when the second<\/strong> OPEN pulse is issued).
    Factory default = 120 ms; this must be changed for every breaker type.<\/li>\n<\/ol>\n\n\n\n

    Recommended first choice:
    C\u2013O control time = measured close time + T\u2003(5 ms \u2264 T \u2264 20 ms)<\/p>\n\n\n\n

    Set the value to 0 ms<\/strong> if you need the minimum achievable C\u2013O time (metal-clad time)<\/strong>.
    With 0 ms the two pulses are issued simultaneously; the breaker\u2019s auxiliary contact must interrupt the close coil circuit and transfer to the open coil. Some breakers cannot tolerate this and may show insufficient opening energy, longer opening time, lower speed, etc.<\/p>\n\n\n\n

    Caution: when C\u2013O control = 0 the pulses remain active for the whole test duration; be sure to:<\/p>\n\n\n\n

      \n
    • limit the total test time, or<\/li>\n\n\n\n
    • rely on the breaker\u2019s anti-pump relay,
      otherwise the breaker will close again after the first C\u2013O cycle.<\/li>\n<\/ul>\n\n\n\n

      Typical target: most manufacturers specify a C\u2013O time \u2248 60 ms.
      Protection relays need \u2265 10 ms to acquire data plus calculation and output-relay pick-up; therefore issuing the open pulse 20 ms after contact make is normally acceptable.<\/p>\n\n\n\n

        \n
      1. O\u2013C\u2013O (Open\u2013Close\u2013Open) control settings
        The \u201cdead time\u201d (no-current interval) is required to be 300 ms.<\/li>\n<\/ol>\n\n\n\n

        Calculate:
        O\u2013C control time = measured open time + 300 ms \u2013 measured close time
        (both times come from single C and single O tests).<\/p>\n\n\n\n

        The second<\/strong> C\u2013O control time inside the O\u2013C\u2013O sequence is set in exactly the same way as described in section 1.<\/p>\n","protected":false},"excerpt":{"rendered":"

        Recommended first choice:C\u2013O control time = measured close time + T\u2003(5 ms \u2264 T \u2264 20 ms) Set the value<\/p>\n","protected":false},"featured_media":0,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","project-cat":[24],"class_list":["post-31721","portfolio","type-portfolio","status-publish","hentry","project-cat-hvswitchtestseries"],"cp_meta_data":{"_elementor_template_type":["wp-post"],"_elementor_version":["3.16.6"],"_wp_page_template":["default"],"_elementor_data":["[{\"id\":\"4a22bc1\",\"elType\":\"container\",\"settings\":{\"equal_height\":\"yes\",\"content_position\":\"top\",\"structure\":\"20\",\"flex_gap\":{\"size\":30,\"column\":\"30\",\"row\":\"30\",\"unit\":\"px\",\"isLinked\":true},\"margin\":{\"unit\":\"px\",\"top\":\"0\",\"right\":\"0\",\"bottom\":\"50\",\"left\":\"0\",\"isLinked\":\"\"},\"flex_direction\":\"row\",\"flex_direction_tablet\":\"column\",\"scroll_y\":-80,\"container_sticky_offset\":50},\"elements\":[{\"id\":\"a9f8c80\",\"elType\":\"container\",\"settings\":{\"_column_size\":\"66\",\"flex_gap\":{\"size\":\"30\",\"column\":\"30\",\"row\":\"30\",\"unit\":\"px\"},\"column_sticky_offset\":\"50\",\"scroll_y\":\"-80\",\"width_tablet\":{\"size\":\"100\",\"unit\":\"%\"},\"content_width\":\"full\",\"width\":{\"unit\":\"%\",\"size\":66.7,\"sizes\":[]},\"container_sticky_offset\":50},\"elements\":[{\"id\":\"d9563c7\",\"elType\":\"widget\",\"settings\":{\"ids\":[{\"id\":480,\"url\":\"http:\\\/\\\/60.205.138.141\\\/wp-content\\\/uploads\\\/2021\\\/08\\\/portfolio-9.jpg\"},{\"id\":476,\"url\":\"http:\\\/\\\/60.205.138.141\\\/wp-content\\\/uploads\\\/2021\\\/08\\\/portfolio-5.jpg\"},{\"id\":477,\"url\":\"http:\\\/\\\/60.205.138.141\\\/wp-content\\\/uploads\\\/2021\\\/08\\\/portfolio-6.jpg\"},{\"id\":478,\"url\":\"http:\\\/\\\/60.205.138.141\\\/wp-content\\\/uploads\\\/2021\\\/08\\\/portfolio-7.jpg\"}],\"ids_size\":\"full\",\"spacing\":\"30\",\"columns\":{\"unit\":\"px\",\"size\":1,\"sizes\":[]},\"scroll_y\":-80,\"sync_parent_id\":\"wd_6571bf6dcb637\"},\"elements\":[],\"widgetType\":\"wd_images_gallery\"}],\"isInner\":true},{\"id\":\"3343de8\",\"elType\":\"container\",\"settings\":{\"_column_size\":\"33\",\"column_sticky\":\"sticky-column\",\"column_sticky_offset\":\"150\",\"scroll_y\":\"-80\",\"width_tablet\":{\"size\":\"100\",\"unit\":\"%\"},\"content_width\":\"full\",\"width\":{\"unit\":\"%\",\"size\":33.7,\"sizes\":[]},\"flex_gap\":{\"column\":\"0\",\"row\":\"0\",\"isLinked\":true,\"unit\":\"px\",\"size\":0},\"container_sticky\":\"yes\",\"container_sticky_offset\":\"150\"},\"elements\":[{\"id\":\"ffa0fa2\",\"elType\":\"widget\",\"settings\":{\"subtitle\":\"\",\"after_title\":\"\",\"image_size\":\"custom\",\"title\":\"Sticky Sidebar\",\"font_container\":\"tag:h4|font_size:46|text_align:left\",\"use_theme_fonts\":\"yes\",\"align\":\"left\",\"size\":\"extra-large\",\"scroll_y\":\"-80\",\"text_typography_typography\":\"custom\",\"text_typography_font_family\":\"Poppins\",\"text_typography_font_size\":{\"unit\":\"px\",\"size\":16,\"sizes\":[]},\"text_typography_font_weight\":\"600\"},\"elements\":[],\"widgetType\":\"wd_title\"},{\"id\":\"e65b1a5\",\"elType\":\"widget\",\"settings\":{\"text\":\"

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