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目前在煤矿井下大量使用的QC83系列等隔爆型磁力起动器中,36V控制电源变压器的9号线都有接地,这是生产厂家出厂时就已经接好了的,而部份局矿在运行中将9号线拆除,其理由是对预防瓦斯爆炸有利,我局也一直在沿用9号线禁止接地的运行方式。究竟是接地好,还是不接地好,哪一种运行方式对防止瓦斯引爆有利,应该有个科学的论断。下面是我对这一问题的个人见解。一、9号线接地时的情况如图1所示,当磁力起动器处于开断状
Currently used in coal mine QC83 series explosion-proof magnetic starter, etc., 36V control power transformer on the 9th line are grounded, this is the factory has been picked up when the factory, and some offices in operation In the line 9 will be demolished, the reason is to prevent gas explosion in favor of our bureau has also been using Line 9 prohibited grounding operation. What is good grounding, or not good ground, which kind of operation to prevent gas detonation favorable, there should be a scientific conclusion. Here is my personal opinion on this issue. First, the situation when the 9th line grounded is shown as in Fig. 1, when the magnetic starter is in the open state