UR8AH 电压互感器的原边接有熔断器

Description

UR8AH 电压互感器的原边接有熔断器

电压互感器（Potential Transformer，简称PT）和变压器类似，是用来变换电压的仪器。但变压器变换电压的目的是方便输送电能，因此容量很大，一般都是以千伏安或兆伏安为计算单位；而电压互感器变换电压的目的，UR8AH主要是用来给测量仪表和继电保护装置供电，用来测量线路的电压、功率和电能，或者用来在线路发生故障时保护线路中的贵重设备、电机和变压器。因此电压互感器的容量很小，一般都只有几伏安、几十伏安，最大也不超过一千伏安。

电压互感器在运行时，一次绕组N1并联接在线路上，二次绕组N2并联接仪表或继电器。特点是容量很小且比较恒定，UR8AH 正常运行时接近于空载状态。电压互感器的原边接有熔断器，副边可靠接地，以免原、副边绝缘损毁时，副边出现对地高电位而造成人身和设备事故。

UR8AH 电压互感器的原边接有熔断器

A Potential Transformer (PT), similar to a transformer, is an instrument used to change voltage. However, the purpose of the transformer conversion voltage is to facilitate the transmission of electric energy, so the capacity is very large, and it is generally calculated in kilovolt-ampere or mega-volt-ampere. For the purpose of voltage transformer voltage conversion, UR8AH is mainly used to supply power to measuring instruments and relay protection devices, to measure the voltage, power and electrical energy of the line, or to protect the valuable equipment, motors and transformers in the line when the line fails. Therefore, the capacity of the voltage transformer is very small, generally only a few voltamps, tens of voltamps, and the maximum is not more than one thousand voltamps.

When the voltage transformer is running, the primary winding N1 is connected to the line, and the secondary winding N2 is connected to the instrument or relay. The characteristic is that the capacity is small and relatively constant, and the UR8AH is close to the no-load state during normal operation. The primary side of the voltage transformer is connected with a fuse, and the secondary side is reliably grounded to avoid the high potential to the ground on the secondary side when the primary and secondary side insulation is damaged, resulting in personal and equipment accidents.