【判断题】
在邻近可能误登的其他鉄构架上,应悬挂“禁止攀登,高压危险!”的标示牌。
A. 对
B. 错
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【判断题】
接地线的接地点与检修设备之间不得连有断路器、隔离开关或熔断器。
A. 对
B. 错
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过电流保护是变压器的主保护。
A. 对
B. 错
【判断题】
因工作间断,次日复工时,应得到运行值班员许可,取回工作票,工作负责人必须在工作前重新认真检查安全措施是否符合工作票的要求,然后才能继续工作。
A. 对
B. 错
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摇表多采用手摇交流发电机作为电源。
A. 对
B. 错
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雨天室外倒闸操作应按规定使用带有防雨罩的绝缘棒。
A. 对
B. 错
【判断题】
继电保护装置的任务之一是当电力系统中某电气元件发生故障时,保护装置能自动、迅速、有选择地将故障元件从电力系统中切除。
A. 对
B. 错
【判断题】
电网倒闸操作,必须根据值班调度员的命令执行,未得到调度指令不得擅自进行操作。
A. 对
B. 错
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屋顶上单支避雷针的保护范围可按45°保护角确定。
A. 对
B. 错
【判断题】
RN2型高压熔断器一般可通过观察熔丝熔断指示器是否弹出,来判断熔丝是否熔断。
A. 对
B. 错
【判断题】
电力系统中的各级电压线路及其联系的各级变、配电所,这一部分叫做电力网,或称电网。
A. 对
B. 错
【判断题】
配电所运行管理条例中规定两票制度必须严格执行,其所指的两票是倒闸操作票和交接班当值票。
A. 对
B. 错
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在特别潮湿场所或工作地点狭窄、行动不方便场所(如金属容器内)应采用12V、6V安全电压。
A. 对
B. 错
【判断题】
电流互感器不得与电压互感器二次侧互相连接,以免造成电流互感器近似开路,出现高电压的危险。
A. 对
B. 错
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高分断能力高压熔断器具有开断短路电流能力强的优点。
A. 对
B. 错
【判断题】
在原理图中,各继电器的线圈和触点分开,分别画在它们各自所属的回路中,并且属于同一个继电器或元件的所有部件都注明同样的符号。
A. 对
B. 错
【判断题】
针式绝缘子主要用于直线杆塔或角度较小的转角杆塔上,也有在耐张杆塔上用以固定导线跳线。
A. 对
B. 错
【判断题】
在冲击短路电流最大值到达之前熔断、切断电路的熔断器称为限流式熔断器。
A. 对
B. 错
【判断题】
供电电压过低是高压电动机最严重的故障。
A. 对
B. 错
【判断题】
触头间介质击穿电压的大小与电源电压无关。
A. 对
B. 错
【判断题】
电能的生产、输送、分配以及转换为其他形态能量的过程,是分时进行的。
A. 对
B. 错
【判断题】
操作要按操作顺序填写,一张操作票只能填写一个操作任务。
A. 对
B. 错
【判断题】
当人体电阻一定时,作用于人体的电压越高,流过人体的电流就越大,这样就越危险。
A. 对
B. 错
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绝缘棒每6个月要进行一次绝缘试验,保证绝缘棒完好
A. 对
B. 错
【判断题】
电压调整率的定义为,在给定负载功率因数下(一般取0.8)二次空载电压U2N和二次负载电压U2之和与二次额定电压U2N的比。
A. 对
B. 错
【判断题】
变压器的故障可分为油箱内和油箱外两种。
A. 对
B. 错
【判断题】
交流高压真空接触器的真空开关管(灭弧室)的动、静触头一般采用圆盘形触头。
A. 对
B. 错
【判断题】
在中性点不接地的电力系统中,单相接地故障运行时间一般不应超过2h。
A. 对
B. 错
【判断题】
电压互感器二次绕组、铁芯和外壳都必须可靠接地,在绕组绝缘损坏时,二次绕组对地电压不会升高,以保证人身和设备安全。
A. 对
B. 错
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变压器的允许温度主要决定于绕组的绝缘材料。
A. 对
B. 错
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有中性线或零线的三相制系统称为三相三线制系统。
A. 对
B. 错
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S11-M(R)-100/10表示三相油浸自冷式,双绕组无励磁调压,卷绕式铁芯(圆载面),密封式,额定容量100kVA,低压侧绕组额定电压为10kV电力变压器。
A. 对
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对于接线方式较为简单的小容量变电所,操作电源常常采用蓄电池。
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单台三相高压电容器的电容元件组在外壳内部一般接成三角形。
A. 对
B. 错
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金属氧化物避雷器的特点包括动作迅速、无续流、残压低、通流量大等。
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B. 错
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对于二次回路的标号,按线的性质、用途进行编号叫相对编号法。
A. 对
B. 错
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磁感应强度B可以看成是与磁场方向相垂直的单位面积上所通过的磁通量。
A. 对
B. 错
【判断题】
大型电力系统有强大的调频和调压能力,有较大的抵御谐波的能力,可以提供质量更高的电能。
A. 对
B. 错
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杆塔按使用的材料可分为钢筋混凝土杆和金属杆塔。
A. 对
B. 错
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电流互感器可分为单相式和三相式。
A. 对
B. 错
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35kV及以下电力线路一般不沿全线装设避雷线。
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B. 错
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