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电缆在通信和广播网络中普遍使用,电缆短路故障也时有发生,在此介绍两种方法,可既快又准地找到短路点的位置。 方法一,将电缆中存在短路的两根导线通过一只自耦调压器接入交流电压,视其电缆导线允许通过的电流串入一只电流表,再在一个带铁芯的线圈(其匝数尽可能多些)两端接一只微安表,将线圈靠近电缆,自通电处开始移动线圈。当线圈移动到短路点上端时,微安表有一个较大指示;而移到短路点下端时,微安表就无指示。这样短路点的位置便可确定(见图1)。
Cables are commonly used in communications and broadcast networks. Cable short-circuit faults also occur from time to time. Here are two ways to find short-circuit point locations quickly and accurately. Method One, the two short-circuited wires in the cable are connected to the AC voltage through an autotransformer, and the current allowed by the cable wire is cascaded into an ammeter, and then wound on an iron core coil Number as many as possible) A microampere two ends of the table, the coil close to the cable, starting from the power coil to move. When the coil is moved to the upper end of the short-circuit point, the micro-ammeter has a larger indication; when it moves to the lower end of the short-circuit point, the microammeter has no indication. The location of such short-circuit point can be determined (see Figure 1).