Author: Noyafa–Cable Tester Manufacturer
The rough measurement of the cable fault point of the cable fault comprehensive tester The rough measurement of the cable fault point of the cable fault comprehensive tester is not afraid of measuring the deviation from the fault point to either end of the cable. This procedure is necessary for fault fixing. The long method of rough measurement is very sharp. According to the basic principle, there are two types, one is the bridge method, and the other is the polarization reflection method. The customary rough measurement method is to convert high-resistance faults into low-resistance faults through burn-through, and then use the bridge method or line voltage pulse reflection method to measure.
Recently, domestic and foreign people attach great importance to the detection of cable faults, and they have successively learned from tourists such as weaving long methods. Now when using the flash tester to detect cable faults, it is no longer necessary to burn through the high resistance, which is enough to directly apply DC to the fault point or shock the ultra-high voltage to make it flashover, and then measure the fault point through the flashover pulse. s position. The DC bridge method is the earliest method to detect cable faults, and it has been a crucial method for detecting cable faults for many years.
For low-resistance grounding and phase-to-phase stuck neck faults, this method is still widely used at present, and the accuracy is high. Similar to ensure that the fault point resistance does not exceed 100kΩ, usually in 2kΩLower is appropriate. Introduce the core resistances on both sides of the cable fault point into the DC bridge and measure the ratio.
From the measured ratio and the cable length, the deviation from the measurement point to the fault point can be calculated. In the figure, RL is the single-core resistance of the cable with a high slope, and RX is the resistance from the beginning to the fault point. By measuring the resistance RX, the distance X from the starting end to the fault point can be calculated.
When the electric bridge method is used to roughly measure the fault point of the cable, the single-arm electric bridge, the arm electric bridge, etc. are commonly used, and the cable flaw detector is also made according to the electric bridge law. Cable fault comprehensive tester for rough measurement of cable fault points Shenzhen Noyafa Electronic Technology Co., Ltd.
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