目前,盐浴炉的快速启动通常采用高压击穿后低压启动的方案。但在高压的接入和切断方面,很多厂家采用手工操作,即在铜排中串入刀闸开关,用以接入、断开高压和低压。这样做有几方面缺点:首先,大电流的刀闸开关一般都卡得很死,操作费力;其二,铜排中流过的电流很大,往往达1000A以上,刀闸开关长期处于大电流工作状态,加上操作频繁,极易烧损;其三,高压切换成低压的时间较长,往往高压击穿了,但 At present, the rapid start-up of salt bath furnace usually adopts the scheme of low pressure start after high pressure breakdown. However, in the high-pressure access and cut off, many manufacturers use manual operation, that is, in the copper bar into the knife switch to access, disconnect the high pressure and low pressure. There are several drawbacks to doing so: First of all, the high-current knife switch are generally very deadlock card, the operation is laborious; Second, the flow of copper in a large current, often up to 1000A, the switch in the long-term high-current work State, coupled with frequent operation, easy to burn; Third, high pressure switch to low pressure for a long time, often high pressure breakdown, but