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兆欧表是沈阳消防科研所研制的防火检查仪器包中的仪表之一,它是用来检测电气线路、设备的绝缘是否良好的一种可携式仪表。因为它测量准确,使用方便,所以在防火检查和电气火灾原因调查中得到广泛应用。 大家知道,兆欧表有三个端子,在一般的测量中,如线间绝缘、电动机绝缘等,只用“E”“L”两个端子就可,但在摇测电缆的绝缘电阻时,还必须用保护环“G”。 为什么测电缆的绝缘电阻时要用保护环?我们结合下图分析一下:
Megohmmeter is one of the instruments in the fireproof inspection instrument package developed by Shenyang Fire Science Research Institute. It is a portable instrument used to detect whether the insulation of electrical lines and equipment is good. Because it is accurate and easy to use, it is widely used in fire inspections and electrical fire investigations. As we all know, there are three terminals for megohmmeters. In general measurements, such as insulation between wires and insulation of motors, only two terminals of “E” and “L” can be used, but when you measure the insulation resistance of cables, The protection ring “G” must be used. Why use a protective ring when measuring the insulation resistance of a cable? Let’s analyze it with the following diagram: