The Design Of Receiving And Emission System For Cable Faults' Non-destructive Examination

Cable networks have become larger, more complicated, and are being used forlonger and longer periods of time. So cable faults happen more quickly and frequently and thenumber of distinct types of cable faults has grown. As a result, a testing system with highprecision, superior fault resolution and simplified operation is required to ensure the smoothoperation of these systems. In pursuance of this goal, this paper introduces a receiving andemission system allowing cable faults to be detected in a non-destructive manner. This systemuses a low-voltage narrow pulse. Its principle of operation is based upon analyzing thetransmission characteristic of an electromagnetic wave in the cable to be tested.This system supplies five different widths of pulses to choose from during testing, whichallows not only superior fault resolution but also increases test precision. In addition, thedevice's measuring range is increased by means of a power amplification circuit designedspecifically for increasing the strength of a narrow pulse. This allows the operator torecognize the reflection wave more easily. In addition, the device has separate receiving andemission circuits, making it easier to operate. This paper analyzes the impedance matching ofsignal source and load is in detail, and provides a theoretical principle and suggestionsconcerning the design of a more precise and efficient signal source. Experiments prove thatthe design of the power amplification circuit and pulse transformer, as well as receiving andemission system meets the design requirements. Compared to the similar products on themarket, this system has a variety of merits;these include superior fault resolution, higher testaccuracy and simplified operation, so this system could be used extensively.