{"id":1818,"date":"2018-10-11T13:58:56","date_gmt":"2018-10-11T13:58:56","guid":{"rendered":"https:\/\/aboutfoundry.com\/?p=1818"},"modified":"2018-10-11T13:58:58","modified_gmt":"2018-10-11T13:58:58","slug":"balancing","status":"publish","type":"post","link":"https:\/\/aboutfoundry.com\/en\/balancing\/","title":{"rendered":"Balancing"},"content":{"rendered":"\n

is required when connecting a 1-phase crucible induction furnace to a 3-phase power supply. Through the use of Steinmetz switching, the 1-phase load is converted into 3-phase of the same size. The power suppliers allow an imbalance of 10% of the highest phase current, depending on the stability of the network. In case of the failure of a balancing choke, a crucible induction furnace can also be operated without balancing devices. It may be necessary to obtain the permis- sion of the power supply company for this imbalanced load at 60% of the nominal current with 2 phases.<\/p>\n\n\n\n

The important factor in this method of operation is that the nominal current of\nthe transformer is not exceeded. an example is given below for a 12.5-t furnace\nwith 2,000 V and 2,600 kW nominal output.\n<\/p>\n\n\n\n

1. the balanced phase must be disconnected from the network.2. the choke must be completely removed.3. the maximum phase current is determined from the rating plate of the transformer.<\/p>\n\n\n\n

4. by slowly increasing the output at 70% of the crucible filling level, the maximum voltage in practice can be determined. If for example at 1,700 V the phase current is over 1,000 A, the next lower step at 1,400 V must be defined as the maximum voltage step, in order not to overload the transformer. The output will then be 1,275 kW and 49% of the nominal output.<\/p>\n\n\n\n

  1. \n\t\t\t\t\t\t\t\tThis current is given for the lowest melting stage for constant output. As a\nrule, the top 5 steps are designed for this purpose, which in this case means at\n1,700 V and Step 6 with 930 A.\n\n\t\t\t\t\t\t\t<\/li>
  2. \n\t\t\t\t\t\t\t\tat 1,700 V and 930 A, this gives an output of 1,580 kW, or 60% of the nominal\noutput.\n\n\t\t\t\t\t\t\t<\/li><\/ol>\n","protected":false},"excerpt":{"rendered":"

    is required when connecting a 1-phase crucible induction furnace to a 3-phase power supply. Through the use of Steinmetz switching, the 1-phase load is converted into 3-phase of the same size. The power suppliers allow an imbalance of 10% of the highest phase current, depending on the stability of the network. In case of the … Continue reading Balancing<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-1818","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"acf":[],"_links":{"self":[{"href":"https:\/\/aboutfoundry.com\/en\/wp-json\/wp\/v2\/posts\/1818","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aboutfoundry.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aboutfoundry.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aboutfoundry.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aboutfoundry.com\/en\/wp-json\/wp\/v2\/comments?post=1818"}],"version-history":[{"count":1,"href":"https:\/\/aboutfoundry.com\/en\/wp-json\/wp\/v2\/posts\/1818\/revisions"}],"predecessor-version":[{"id":1819,"href":"https:\/\/aboutfoundry.com\/en\/wp-json\/wp\/v2\/posts\/1818\/revisions\/1819"}],"wp:attachment":[{"href":"https:\/\/aboutfoundry.com\/en\/wp-json\/wp\/v2\/media?parent=1818"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aboutfoundry.com\/en\/wp-json\/wp\/v2\/categories?post=1818"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aboutfoundry.com\/en\/wp-json\/wp\/v2\/tags?post=1818"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}