High voltage bridge cable fault testerDesigned based on the principle of MURRAY bridge, it is suitable for locating the breakdown points (low resistance, high resistance, and flashover type breakdown) of various wires and cables after laying, as well as points with low insulation resistance but no breakdown. For example, using a megohmmeter to discover insulation defects with low cable resistance but no breakdown under operating voltage. Of course, it can also be used for defect location of various cables in cable factories. There are two methods for rough cable fault location: bridge method and wave reflection method. At present, the wave reflection method positioning instrument is quite popular. Its disadvantage is that some instruments have complex on-site connections and blind spots in positioning. When the waveform is atypical, it is required that the positioning personnel be proficient in the instrument and experienced in order to distinguish pulse waveforms. There are several types of cable faults that are difficult to locate using wave reflection methods, such as insulation defects in high-voltage cable sheaths, low pressure cables with steel tape armor, PVC cables, which have no reflected waves and cannot be located. Short cable, unable to locate. Some high resistance penetration points cannot be penetrated under impulse voltage and are difficult to locate.
Product Features:
The equipment adopts a high-frequency and high-voltage switching power supply to form a high-voltage constant current source, with high voltage, stable current, small size, and light weight.
Using a high-sensitivity amplifier and galvanometer to indicate balance, and forming a balance bridge with a proportional potentiometer, the entire device is placed at a high potential. The operation button on the panel is at a low potential, and the bridge is operated through an insulating rod.
Specially designed dual core high-voltage rubber measuring cable with copper mesh braided shielding layer for reliable grounding and safe use. The four terminal resistance measurement method avoids errors introduced by lead resistance.
The high-voltage constant current source and bridge are integrated into a portable aluminum alloy box. The equipment has high voltage, light weight, and easy operation.
Compared with the wave reflection method, the bridge balance method has no blind spots and is particularly suitable for determining the breakdown point of short cables and near the end, making it easy to operate.