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新《煤矿安全规程》第423条(原规程第407条)规定,对井下低压馈电线上装设的检漏保护器每天应进行一次试验。但因变电所与工作面距离较远,控制设备又都选用磁力起动器,因此各设备的重新起动需经一段时间,其结果是: 1.使掘进工作面停风(下山掘进还停水泵)而造成瓦斯积聚,有引起瓦斯爆炸和水淹的危险。 2.有时影响工作面生产的连续性: 3.每天试验使电源馈电开关每年有近四百次的无意义跳闸,降低了使用寿命。为了解决不停电试验检漏继电器的问题,我矿曾用两台馈电开关并联,其中之一作为在试验检漏继电器时临时合上之用,其缺点: 1.投资大,多用了一台开关; 2.在操作试验过程中,电网处在无漏电保护状态的持续时间至少有数分钟,这就
Article 423 of the new “Coal Mine Safety Regulations” (Article 407 of the original code) stipulates that the leak detection protector installed on the underground low-voltage feeder should be tested once a day. However, due to the substation and the working surface are far away from each other, the control equipment and the magnetic starter are selected, so the restart of the equipment to take some time, the result is: 1. Stop ventilation face (down the mountain driving water pump ) Caused by gas accumulation, there is the risk of gas explosion and flooding. 2. Occasionally affect the continuity of face production: 3. Every day the test makes the power feed switch almost four hundred times a year meaningless tripping, reducing the service life. In order to solve the problem of non-power failure test leak detection relay, I used mine with two feed switches in parallel, one of them as a temporary leak in the test leak relay, its disadvantages: 1. Investment, more use of a Switch; 2. In the operation of the test process, the power grid in the absence of leakage protection for at least a few minutes duration, which