Cable fault tester directly emits low-voltage pulses without high-voltage equipment
The cable fault tester (also known as cable fault locator, cable fault flash tester) is a "stethoscope" in the fields of electric power, communication, and municipal maintenance, specifically used for rapid detection and precise location of various faults in underground or overhead cables. When cables experience short circuits, open circuits, or insulation aging, it helps maintenance personnel pinpoint the fault point in the shortest possible time, significantly reducing outage repair time.
⚡ Core Working Principle
The cable fault tester is mainly based on the "radar" pulse reflection principle (Time Domain Reflectometry, TDR), combined with high-voltage flashover technology to detect faults. Its core workflow is as follows:
Emit pulse: The instrument sends a low-voltage test pulse (or high-voltage impulse) to the cable under test.
Receive reflected wave: The pulse propagates through the cable, and when it encounters impedance mismatches (such as breakpoints, short-circuit points, high-resistance fault points), reflected waves are generated.
Calculate distance: The instrument uses a high-speed data acquisition system to precisely record the time difference between the transmitted wave and the reflected wave, combined with the propagation speed of electromagnetic waves in the cable, and uses the formula L = V·△T / 2 to automatically calculate the distance from the fault point to the test end.
