问题 问答题 简答题

安全生产对验电工作的总体要求有哪些?

答案

参考答案:

验电是工作或操作安全时所做的技术措施中十分重要的和必须进行的步骤。按规定实施正确验电,可以有效地防止在带电设备上挂地线或合接地隔离开关而产生的恶性事故和其它触电事故。对验电操作主要有以下几方面要求。

(1)对人的要求。验电最关键的问题是要验正确。要防止发生将有电当无电、强电当静电的错误判断,必须做到端正工作态度,克服麻痹大意和走过场的错误习惯,要熟悉和掌握验电的方法和要领。

(2)验电时的安全要求。验电时必须使用与所验电压等级相符的验电器,禁止发生不加区别混用验电器的违章作业行为。因为以低压验高压时,绝缘强度无保证,操作人的人身安全将受到威胁。而以高压验低压时,实际电压可能达不到验电器发光管的清晰发光电压(一般为额定电压的25%左右)。验电时,如该验电器无音响,再加上光线强,光管发光与不发光将难以辨识,稍有疏忽就有可能把有电验成了无电。

遵照规程要求,验电的安全要领是:使用基本绝缘安全用具还须配合以辅助安全用具;操作人员必须戴绝缘手套;下雨天气还应使用带有防雨罩和防水功能的验电器,禁止使用普通验电器,以避免被淋湿后发生沿面放电或闪络。

(3)验电地点的要求。根据操作票内容或工作要求,在什么地方装设接地线就在什么地方验电。注意:有几相,就分验几相;有几侧可能的电源,就在几侧相应的地点分别验电。验电前,应先检查接地线,做好展放准备,以便于验明确无电压后迅速装设接地线。

(4)确证验电器良好。验电前,对所使用的验电器不仅要检查合格,即在试验有效期内,而且还要在与所验电压等级相同的有电设备上试验证实器具良好,这样才可以进行实际操作验电。

(5)验电应掌握正确的方法。使用验电器应逐渐接近导体,操作人员要记住该验电器在该电压等级时的发光报警距离,以做到心中有数,边操作边判断(对一般验电器的发光报警距离,使用应参照产品说明书,并以现场实地试验后确定的数字为准)。

对35kV及以上电压等级的电气设备进行验电,如没有专用的验电器,可以用相应电压等级的绝缘杆代替验电器验电。值班人员应懂得它的原理,特别注意操作方法,不可勾住导线或顶着导体,而应留开一点距离,形成气隙,使其空气被电离,这样才能产生可见的火花或放电的滋滋声和噼叭声。

单项选择题
单项选择题

Should we care if over 150 known species of animals have (91) from the earth in the last fifty years Should we be concerned that there are (92) thousands of species whose very existence is (93) endangered—largely because of our activities (94) , after all, is the natural end of populations. Species are born, then (95) , and then die. Some live a (96) time, perhaps millions of years; some die more quickly. We have (97) the extinction of many species we know about, and we have undoubtedly sealed the (98) of others. In fact, there are undoubtedly many other species that have lived among us during our time on earth, but that have disappeared as a (n) (99) of our activities without our ever having known they existed.
It is hard to explain the rationale of many of us who are concerned about such matters. I have never seen a sea whale, (100) I don’t want them to become extinct. Moreover, I felt this way long before I understood anything about how they might be an important part of an ecosystem. Possibly such feelings merely reflect the cultural attitude that it is "nice" to wish other living things well; thus, the attitude is (101) . I feel nice.
There are, of course, more rational reasons for (102) the extermination of any species. For one thing, the kind of attitude that encourages or sanctions the destruction of other species is a threat (103) our own wellbeing. If such an attitude exists, we ourselves might (104) victim to it. living things (including us) might be expected to fare better where there is (105) for life. The extinction of other species could also threaten us (106) by simplifying the system of which we are a part or by destroying parts of the ecosystem (107) which we directly rely. For example, if we continue to poison the oceans (108) we are willing to believe only a few bottom dwellers are affected, we might (109) overstep some critical threshold and trigger the wholesale death of plankton, thus finding ourselves without a major (110) of the world’s food and with our oxygen supplies dwindling.

A.effect

B.result

C.issue

D.event