Cable Fault Tester Features Cable Fault Determination Method
Cable fault detectors are often transported or transported over long distances during production site and customer service. In order to ensure the integrity of transportation and use of cable fault detectors, routine maintenance and management of cable fault detectors are especially necessary. Nowadays, many power supply bureaus have purchased cable fault detectors and are equipped with special testing personnel. At the same time, the actual frequency of cable fault detectors is not too high. Therefore, the probability of faults occurring due to the transportation use of the equipment itself is not too high. high. Next Xiaobian introduced the characteristics of the cable fault tester and the precise method of cable fault determination.
Cable fault tester features
1, with wave open and parameter storage, call out function. With non-volatile devices, waveforms and data are not lost after shutdown.
2, high test accuracy. The instrument uses high-speed data sampling technology with a read resolution of 1m. High degree of intelligence. The test results are automatically displayed on a large-screen LCD with small size and data, and the fault is intuitively judged. And it is equipped with a menu display operation function, which does not require special training for the operator.
3, perfect function, test failure risk is low, fast and accurate. The instrument uses low-voltage pulse method and high-voltage flashover method to detect, can test various faults of the cable, and directly test the flashover and high resistance fault of the power cable without burning through. If equipped with sound point meter, can accurately determine the location of the fault point
4, with dual trace display function. The test waveform of the faulty cable can be compared with the normal waveform, which is conducive to the further judgment of the fault.
5, can easily change the location of the double cursor, direct display cable instrument fault point and the test point of the direct distance or relative distance.
6. Control the measurement cursor, automatically search along the line, and automatically stop at the inflection point of the fault waveform.
7, with the waveform scaling function. Change the waveform scale to expand the waveform for accurate testing.
8, also has a print function. Print out the results of the test.
Cable fault determination method
1. Sound measurement method: The use of sound measurement points is a method of using cable fault fixed points from the past to the present. And it is the most effective method. However, the instrument used has evolved from a simple acoustical amplifier in the past to a commonly used acoustic-magnetic synchronous fixed point instrument. Sound measurement points are applicable to high voltage cables, low voltage cables, buried cables, cable trench cables, and so on. The legal point of sound measurement is that the high-voltage pulse generator discharges the faulty cable, the arc at the fault point generates a discharge sound, and the seismic wave is generated when the cable is buried directly. The sounding probe (sound sensor) of the fixed-point instrument picks up the seismic wave signal. After amplification and output through the headset or head. Through a large number of field tests, after the seismic wave passes from the fault point of the cable to the ground, it rapidly decays to a small value outside the radius of 2 meters. Therefore, when we use the fixed-point instrument to monitor the seismic wave, we usually monitor the seismic wave at a distance of 4 meters. once. When the seismic wave is heard, it means that the fault point is already within 2m. If you carefully find the maximum point of the sound, you can find the fault point accurately.
Step-by-step voltage method: The use of step-by-step voltage statutory points is mainly aimed at the fixed point of the outer sheath grounding fault required for the outer sheath insulation of the cable. Now, the grounding fault of some directly buried low-voltage cables and core wires without armoring is established. Step voltage regulation points can also be used.
3. Electromagnetic method and audio method: Using electromagnetic waves as fixed points or audio-statutory points, that is, the use of the point of failure of the cable to determine the fault point before or after the electromagnetic signal or audio signal changes, which is theoretically feasible. However, from the current situation, there is no reliable fixed-point instrument that can be practically used. Or, the fixed point instrument using electromagnetic wave fixed point is still in the research and development of various scientific research institutions. It needs further verification and improvement in practice to reach the practical application level.
4. Acoustic-magnetic synchronization method: It integrates sound measurement method and electromagnetic wave method. For example, the DTC series sound and magnetic synchronous fixed point instrument adopts fixed-point principle combining the sound measurement official point and sound-magnetic synchronous fixed point method. When sounding a statutory point, the head of the fixed point meter indicates the seismic wave received by the sounding probe, and the earphone also reflects the seismic sound wave received by the sounding probe. Above the point of failure, the acoustic signal is at a maximum, away from the point of failure, the acoustic signal is reduced, or the acoustic signal is absent. When sound and magnetic synch with the legal point, the head of the sound table reflects the seismic sound wave received by the sounding probe. The magnetic head and the earphone simultaneously indicate the electromagnetic wave received by the synchronous receiving antenna when the fault point is discharged. When the sounding probe is placed above the point of failure, the two meter indications and the headphone sound are synchronized. When the acoustic wave signal is not received, the magnetic-acoustic synchronous electromagnetic wave receiving function can be used to timely learn the ball gap discharge rhythm, which is advantageous to distinguish the weak acoustic signal at the fault point in a noisy environment. In addition, the acousto-magnetic synchronous fixed point instrument can synchronize the fault fixed point and the cable path detection work, greatly improving the fault fixed point efficiency.
5, the magnetic field predetermined point technology: The principle of the cable fault magnetic field predetermined point technology is: through the high voltage DC pulse generator, so that the fault point of the cable arc, in the presence of the arc, the cable into the audio signal. This audio signal is shorted by an arc at the point of cable failure and no longer propagates to the cable termination. A special receiver is used to receive the audio electromagnetic wave signal radiated from the cable. By comparing the magnitude of the amplitude of the audio electromagnetic wave before and after the point of failure, it is judged whether the receiver is located before or after the fault point, so as to achieve the purpose of rapid predetermined point.
Editor's summary: The characteristics of the cable fault tester and the method for determining the exact point of the cable fault are introduced here. I hope to help everyone. If you want to know more related information, you can pay attention to this website information.
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