ZC29B-2型接地摇表如何使用(实用且详细的说明)?怎么看测试结果?
推荐回答(3个)
在E-E两个接线柱测量接地电阻时,用镀铬铜板短接,并接在随仪表配来的5m长纯铜导线上,导线的另一端接在待测的接地体测试点上。
测量屏蔽体电阻时,应松开镀铬铜板,一个E接线柱接接地体,另一个E接线柱接屏蔽。P柱接随仪表配来的20m纯铜导线,导线另一端接插针。C柱接随仪表配来的40m纯铜导线,导线的另一端接插针2。
缓慢转动手柄,检流表指针从0平衡点向右偏移,则说明接地电阻值仍偏大,在缓慢转动手柄同时,接地电阻旋钮应缓慢顺时针转动,当检流表指针归0时,逐渐加快手柄转速,使手柄转速达到120转/分,此时接地电阻指示的电阻值乘以档位的倍数,就是测量接地体的接地电阻值。
如果检流表指针缓慢向左偏转,说明接地电阻旋钮所处在的阻值小于实际接地阻值,可缓慢逆时针旋转,调大仪表电阻指示值。

扩展资料:
接地电阻测试仪设置的技术要求
(1)接地电阻测试仪数字接地电阻测试仪应放置在离测试点1~3m处,放置应平稳,便于操作。
(2)每个接线头的接线柱都必须接触良好,连接牢固。
(3)两个接地极插针应设置在离待测接地体左右分别为20m和40m的位置,如果用一直线将两插针连接,待测接地体应基本在这一直线上。
(4)不得用其他导线代替随仪表配置来的5m、20m、40m长的纯铜导线。
(5)如果以接地电阻测试仪数字接地电阻测试仪为圆心,则两支插针与测试仪之间的夹角最小不得小于120° ,更不可同方向设置。
(6)两插针设置的土质必须坚实,不能设置在泥地、回填土、树根旁、草丛等位置。
(7)雨后连续7个晴天后才能进行接地电阻的测试。
(8)待测接地体应先进行除锈等处理,以保证可靠的电气连接
参考资料:百度百科-兆欧表
ZC29B-2接地摇表上有4个桩头,靠左边桩头有一铁片,是短路片,该桩连接黄绿线,接被测物,可以接一根线,测一点,也可以将短接片去掉,同时接二根线,测相邻连接的二点,如输电铁塔的二只脚。其旁边的一桩接20m线,接插地棒;最边的一桩接40m线,接插地棒。要求被测点及二棒基本成直线,且二棒远离被测建筑,也就是垂直于建筑。
测前查下所有连接被测点的范围内,无外电源,如你在这边测,那边有人在烧电焊,那指针是不稳定的,且可能损坏摇表。
在表下垫块砖,以免摇手被地擦伤,用左膝顶住表,右手摇(120转/分钟),左手把大转盘转动,使指针稳停在中间(如大转盘不论左右转,指针都不能回到中间,则是档位不当,换个档位)。根据档位查实测值。如小刻度(档位)是0.1;那大转盘上的一大格就是0.1欧姆,如大转盘上被箭头对准的是2.5,则实测值是0.25欧姆。
使用接地摇表的方法是;
1 断开被测接地的所有电源;
2 接地摇表出厂有3条电线,长的2条是离被测接地10米或者更远的地方,有钢钎插入泥土中,短的1条是接在被测接地上;
3 接地摇表有4个桩头,靠左边桩头有一铁片,是短路铁片,也就是左边2个桩头短路后接短的一条线,右边的2个桩头分别接长的2条线;
4 接地摇表上面有大刻度1--10,指针,小刻度0.1;1;10三档可调(有的可能不同);
5 摇动接地摇表后调小刻度盘,指针摆动,在接地摇表转速均匀,指针不动而且有读数就算是测出地阻了;
6 如果指针在大刻度上面是5,小刻度在10的档位,那么地阻是50欧姆,如果小刻度在0.1档位,那么地阻就是0.5欧姆,大刻度读数和档位读数是相乘的。
希望能够帮助你
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