By hvhipot 
The cable fault tester under HV Hipot Electric Co., Ltd. power can help many power workers conduct various power tests more conveniently.
Although cable fault detection equipment has brought certain convenience to cable fault detection. However, in practical applications, cable fault detection equipment may have deviations in detection results due to various uncertain factors. So what are the reasons for cable fault detection errors?
Human Error
At present, cable fault detectors developed based on the principle of traveling wave method are mainly used for testing personnel to analyze the fault detection waveform, determine and calculate the distance and position of the fault point. The interpretation error generated by users is sometimes a significant detection error, usually related to the work experience of the detection personnel, mainly reflected in the application of detection methods, the testing voltage level during the detection process, wiring details, and the judgment of the inflection point of the detection waveform. Superior. This is also one of the main reasons why cable fault detection is more difficult than other electrical equipment fault detection. Due to the irregularity and complexity of cable fault detection waveforms,
Cable error
The main error is caused by the transmission speed V of radio waves on the tested cable. From the formula L=(U * T)/2, it can be seen that the cable fault detection distance L is proportional to V. In cable fault detection, we say V is a constant, it is a relative concept, not a fixed value. Actual measurements and relevant data indicate that the transmission speed V generally produces a relative error of ± 2%. For example, the transmission speed V of XLEP cable is about 172.3m/s, and there are two reasons for the error in transmission speed V: one is that cables of the same type produced by different manufacturers may have error processes and components due to production. Secondly, the aging of the cable insulation layer leads to changes in V, and there is no accurate data to explain this trend. Notes:
environment error
After the rough measurement of cable faults is completed, distance measurement is usually based on the detection distance data along the cable direction. However, due to poor environmental conditions (such as rivers, ditches, buildings, etc.), measurement is very difficult and often can only be a very rough approximation.
In addition to the above, the reasons for the errors of the cable fault detector are also excluded, but other factors such as equipment failures are also ruled out. In order to avoid errors in the detection of cable fault detectors, we need to carefully analyze the data during the detection.