NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–Cable Length Tester
High Voltage Bridge Fault Tester Manufacturer High Voltage Bridge Fault Tester Design Principle High Voltage Bridge Fault Tester Manufacturer has designed a high voltage bridge cable fault tester according to the working principle of Murray bridge. It is suitable for the breakdown point (low resistance, high resistance, flashover breakdown) and low insulation resistance without breakdown point after laying various wires and cables. For example, use a megger to find insulation defects with low resistance but no breakdown at operating voltage.
Of course, it can also be used to locate the defect points of various cables in the cable factory. There are two methods for fault location of rough measurement cables: bridge method and wave reflection method. Wave reflection locators are more popular.
Disadvantages are: some instruments have complicated on-site wiring and large blind spots. When the waveform is not typical, the positioning personnel need to be proficient in the instrument and have rich experience to distinguish the pulse waveform. The cable faults that are difficult to find by the wave reflection method include: high-voltage cable sheath insulation defects, steel tape armored low-voltage cable insulation defects, PVC cable insulation defects, no reflected waves, and cannot be located.
Short cable, can't find it. Some high-resistance perforation points cannot be broken down under the impulse voltage, and it is difficult to locate. The high-voltage bridge cable fault tester adopts a high-frequency high-voltage constant current source, which solves the problem of interference from the power supply to the high-sensitivity amplification of the bridge.
The power supply and bridge are integrated. The measuring cable is a special high-voltage cable, which adopts the principle of four-terminal resistance measurement and has high positioning accuracy. The bridge is placed on the high voltage side, and the operating knob is safely grounded.
It completely solves the limitation of the high-resistance positioning of the electric bridge method, and gives full play to the characteristics of the electric bridge method, such as no blind spot, high precision and convenience. High-voltage bridge fault tester design principle High-voltage bridge fault tester manufacturer Shenzhen Noyafa Electronic Technology Co., Ltd.
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