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高压互感器作用

2014/1/10 9:15:26      点击:
 高压互感器 的作用有以下几方面:
将一次回路的高电压和大电流变为二次回路的标准位,通常额定二次电压为100V,额定二次电流为5A,使测址仪表和保护装置标准化,以及二次设备的绝缘水平可按低电压设计,从而结构轻巧,价格便宜。
所有二次设备可用低电压、小电流的控制电缆连接,使屏内布线简一单、安装方便。同时,便于集中竹理,可实现远方控制和测量。
二次回路不受一次回路的限制.可采用Y形、△形或V形接法,因而接线灵活方便。同时,对二次设备进行维护、调换以及调整试验时,不需中断一次系统的运行,仅适当地改变二次接线即可实现。
使二次设备和工作人员与高电压部分隔离,且互感器二次侧均接地,从而保证了设备和人身的安全。
在交流电路中,常用互感器把高电压转换成低电压,大电流转换成小电流,此后再供测量、控制、保护用。这样不但可以加大测量仪表从程,便于仪表标准化,降低控制、保护设备的电压和电流,而且使仪表与设备或高压电路隔开,保证仪表、设备和工作人员的安全