Author: Noyafa–Cable Length Tester
It is of great significance to quickly find the fault point of the cable and deal with it in time, which is of great significance to reduce the accident loss. After determining the type of cable fault, taking corresponding investigation methods and locating the fault point is the key link in cable fault handling. Then you know that there are cable fault points. Quickly discovering cable fault points and dealing with them in time is of great significance to reducing accident losses.
After determining the type of cable fault, taking corresponding investigation methods and locating the fault point is the key link in cable fault handling. So do you know what troubleshooting methods are available for cable fault points? Next, let's listen to the cable routing instrument manufacturer to introduce it to you! 1. Sensory search method When the cable in operation fails and causes the circuit breaker to alarm, use the The type of cable fault is judged by ohmmeter measurement. When the cable telemetry is short-circuit or low-resistance fault, it indicates that the cable has broken down, and the exposure of such accidents is more obvious. The sensory search method is adopted, that is, the inspection is carried out step by step by means of eye observation, hand touch, nose smell, etc., focusing on the inspection of the cable terminal head and the middle head. The fault point can be found quickly in a short time.
2. Segmentation search method The segmented search method is to segment the faulty cable line. This method is used for the occasions where the cable laying route is long, there are serial devices in the middle or the cable head is connected by high-voltage plugs, which can reduce the scope of investigation and reduce the The role of difficulty. 3. Electric bridge method The electric bridge method is to measure the DC resistance value of the cable core wire by the double-arm bridge, and then accurately measure the actual length of the cable, and calculate the fault point according to the proportional relationship between the cable length and the resistance. When using the bridge method, the measurement accuracy should be ensured. The bridge connecting line should be as short as possible, the diameter should be large enough, and the connection with the cable core should be crimped or welded, and all decimal places should be reserved in the calculation process.
4. Sound measurement method The so-called sound measurement method is to search according to the sound of the faulty cable discharge. This method is more effective for the flashover discharge of the high-voltage cable core wire to the insulation layer. When the capacitor C is charged to a certain voltage value, the ball gap discharges the faulty core wire of the cable, and the cable core wire discharges to the insulation layer at the fault."nourish, nourish"When the noise is the smallest, use audio amplification equipment such as deaf hearing aids or medical stethoscopes to search. When searching, keep the pickup close to the ground and move slowly along the cable"nourish, nourish"When the discharge sound is the largest, this is the fault point.
Be sure to pay attention to safety when using this method, and special personnel should be set up to monitor the end of the test equipment and the end of the cable. 5. Capacitance current measurement method During the operation of the cable, there is capacitance between the core wires and between the core wires to the ground. The capacitance is evenly distributed, and the capacitance is linearly proportional to the length of the cable. The capacitance current measurement method is based on this principle. The measurement is very accurate for the measurement of the cable core wire disconnection fault. During the measurement process, as long as the voltage remains unchanged, the ammeter reading is accurate, and the total length of the cable is accurately measured, and the measurement error is relatively small.
The manufacturer of the cable path meter pointed out that there are also pulse measurement method, burn-through method, DC high voltage flashover measurement method, impact high voltage flashover measurement method, but the methods mentioned in this article are all easy to operate, fast and accurate. The required equipment is basically what metallurgical enterprises generally have, so it is more economical and applicable. I believe that after reading the above introduction of the cable routing instrument manufacturer, you should have some understanding of the method of cable troubleshooting.
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