Schaltbau investigated the clearances and creepage distances in the high-voltage relay, then compared these parameters with its own DC contactors. The double pole C294 DC contactor was selected. The C294 has better insulation parameters than the high-voltage relay; but most importantly it has solid contacts that withstand arcing better than a high-voltage relay.<\/p>\n
What does the C294 precharging relay do?<\/p>\n
Before the system is switched on, the capacitors have to be charged. This is done via a separate precharging path \u2013 with a resistor that limits the current flow. The C294 precharging contactor closes the precharging path. Once the capacitors are two-thirds charged, the main contactor is activated. Then the C294 opens the precharging path again.<\/p>\n
Why was the C294 chosen?<\/p>\n
Better clearances and creepage distances than the high-voltage relay<\/p>\n
Rated impulse withstand voltage Uimp up to 12 kV<\/p>\n
Contact pills prevent contact welding<\/p>\n
Note<\/p>\n
Schaltbau also provides the CT power contactor<\/a> as the main contactor in many test bench applications.<\/p>\n ","protected":false},"excerpt":{"rendered":" An automobile manufacturer needed a precharging contactor for their electric motor test benches that could withstand arcing during switch-on. They previously used a high-voltage relay, but its contacts frequently welded. Schaltbau investigated the clearances and creepage distances in the high-voltage … Continued<\/a><\/p>\n","protected":false},"author":1,"featured_media":4228,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[11],"_links":{"self":[{"href":"https:\/\/tls-company.kz\/en\/wp-json\/wp\/v2\/posts\/4227"}],"collection":[{"href":"https:\/\/tls-company.kz\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tls-company.kz\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tls-company.kz\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tls-company.kz\/en\/wp-json\/wp\/v2\/comments?post=4227"}],"version-history":[{"count":0,"href":"https:\/\/tls-company.kz\/en\/wp-json\/wp\/v2\/posts\/4227\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tls-company.kz\/en\/wp-json\/wp\/v2\/media\/4228"}],"wp:attachment":[{"href":"https:\/\/tls-company.kz\/en\/wp-json\/wp\/v2\/media?parent=4227"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tls-company.kz\/en\/wp-json\/wp\/v2\/categories?post=4227"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tls-company.kz\/en\/wp-json\/wp\/v2\/tags?post=4227"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}