Author: Noyafa–Cable Tester Manufacturer
The fault point finding method of the cable fault tester The manufacturer of the cable fault tester When a fault occurs in the running cable, first determine the type of fault. The cable fault types of the cable fault tester can be roughly divided into three types: ground fault and short-circuit fault. The fault point of the cable fault tester is found. When the cable fault tester manufacturer fails, it first determines the type of fault. The cable fault types of the cable fault tester can be roughly divided into three types: ground fault, short circuit fault, disconnection fault, disconnection and ground fault.
Cable fault point troubleshooting method After determining the type of cable fault. Take corresponding troubleshooting methods. Locating the fault point is a key link in cable fault handling. Here are several methods: 1. Sensory search method When the cable in operation fails and causes the circuit breaker to alarm, use it first. The megohmmeter measures and judges the type of cable fault. When the cable telemetry is short-circuit or low-resistance fault, it indicates that the cable has been broken down, and the exposure of such accidents is more obvious. The sensory search method can be used, that is, the method of eye observation, hand touch, nose smell, etc. can be used for step-by-step inspection, focusing on the inspection of the cable terminal head and the middle head. The fault point can be found quickly in a relatively short time. 2. Segmentation search method The segmentation search method is to segment the faulty cable line. This method is used for long cable laying routes. There are serial devices in the middle or the cable head is connected by a high-voltage plug. .It can narrow the scope of investigation and reduce the difficulty of investigation. 3. Sound measurement method The so-called sound measurement method is to search according to the sound of the faulty cable discharge. The recovery method is more effective for the flashover discharge of the core wire of the high-voltage cable 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. At the fault, the cable core wire is discharged to the insulation.”nourish, nourish”The spark discharge sound. When the noise is the smallest, use the audio amplification equipment such as behind-the-ear 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, the HiJ and the fault point must pay attention to safety when using this method. Special personnel should monitor the test equipment end and the cable end. 4. Electric bridge method The electric bridge method is to measure the DC resistance value of the cable core wire by the double-arm electric bridge. Then accurately measure the actual length of the cable, according to the proportional relationship between the cable length and the resistance, calculate the fault point, and use the electric bridge method to find the fault point. Single-phase or two-phase low-resistance ground fault Shenzhen Noyafa Electronic Technology Co., Ltd.
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