春晨HR电动葫芦手柄线

江苏春晨电缆有限公司生产HR电动葫芦手柄线，HR电动葫芦手柄线，

作用及原理

Function and Principle

电压互感器结构如图（a）所示，其作用是可用它扩大交流电压表的量程，将高电压与电气工作人员隔离。其工作原理与普通变压器空载情况相似。使用时，应把匝数较多的高压绕组跨接至需要测量其电压的供电线路上，而匝数较少的低压绕组则与电压表相连，如下图（b）所示。

The structure of voltage transformer is shown in figure (a). Its function is to expand the range of AC voltmeter and isolate high voltage from electrical staff. Its working principle is similar to that of ordinary transformer without load. When in use, the high voltage winding with more turns should be connected to the power supply line which needs to measure its voltage, while the low voltage winding with less turns should be connected to the voltmeter, as shown in the following figure (b).

电压互感器原理图因为U1/U2=K，所以U1=KU2，由此可见高压线路的电压等于副边所测得的电压与变压比的乘积（回顾：变压器工作原理、原副边电压计算公式及变压器变压比讲解）。当电压表同一只专用的电压互感器配套使用时，伏特表的刻度就可以按电压互感器高压侧的电压标出，这样就可不必经过换算，而直接从该电压表上读出高压线路的电压值。

The principle diagram of voltage transformer is U1/U2=K, so U1=KU2. It can be seen that the voltage of high-voltage line is equal to the product of the voltage measured by the secondary side and the voltage conversion ratio (review: the working principle of transformer, the formulas for calculating the secondary side voltage and the explanation of the transformer voltage conversion ratio). When the voltmeter is used in conjunction with a special voltage transformer, the scale of the voltmeter can be marked according to the voltage on the high-voltage side of the voltage transformer, so that the voltage value of the high-voltage line can be read directly from the voltmeter without conversion.

通常电压互感器副边线绕组的额定电压均设计同一标准值为100伏。因此，在不同电压等级的电路中所用的电压互感器，其变压比是不同的，例如1000/100，600/100等等。

Normally, the rated voltage of the secondary side winding of voltage transformer is designed with the same standard value of 100 volts. Therefore, the voltage transformer used in different voltage level circuits has different voltage ratio, such as 1000/100, 600/100 and so on.

为了工作安全，电压互感器的铁壳机副边绕组的一端必须接地，以防高、低压线圈间绝缘损坏时，使低压线圈的测量仪表对地产生一个高电压，危机工作人员的人身安全

In order to work safely, one end of the secondary winding of the voltage transformer's iron shell machine must be grounded to prevent the insulation damage between the high and low voltage coils from causing a high voltage to the ground of the measuring instrument of the low voltage coil, which will endanger the personal safety of the staff.