NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–Cable Tester Manufacturer
Low-voltage cable fault distance meter High-voltage cable fault point finding method summary High-voltage cable fault distance meter can directly measure and fix the fault of direct short-circuit or disconnected cable with a multimeter; Remotely measure the insulation resistance between the core wires or the insulation resistance of the core wires to the ground, and the cable fault item can be judged according to its resistance value. The cable fault finding method is similar to the initial test method (sensory search method), which is also judged by experience, but the accuracy and reliability are very poor. At present, the cable fault finding method mainly uses the bridge method; the low-voltage pulse method, also known as radar method; pulse voltage method; pulse current method; secondary pulse method and tossing and de-pulsing method. It has high reliability and high accuracy.
1. Sensory search method of cable fault finding method Perform sensory search and search on faulty cables. When a fault occurs in the operating cable and the circuit breaker alarms, first use a megohmmeter to measure the type of cable fault, and the cable telemetry is short-circuit or low. When the fault is blocked, it indicates that the cable has been broken down, and the exposure of this type of accident is more obvious. If the cable laying method and personnel go in to check, and the error is long, the sensory search method can be used, that is, the use of eye observation, hand touch, nose smell and other methods to be checked step by step, and the top priority is to check the cable apex head and the middle and high-grade head parts. The point of failure can be quickly found in a relatively short age. 2. The segmental search method of the cable fault finding method is used to find the faulty cable at the turnout, and the subdivision finding method is to separate the faulty cable path. This method is used for a long cable laying path. There are series and parallel devices or cable heads used. The high-voltage plug is connected to the field of three consecutive methods. Only by simplifying the investigation and limitation. The intention of compressing the difficulty of investigation 3. The sound measurement method of the cable fault finding method The so-called sound measurement method is to search according to the sound of the faulty cable discharge. The flashover discharge of the core wire to the insulation layer is more effective. When the capacitor is charged to the final voltage value, the ball discharges the faulty core wire of the cable, and the insulation discharge of the cable core wire occurs at the fault.”nourish, nourish”Then, in the period when the noise is the least, relying on the rhythm of behind-the-ear hearing aids or medical stethoscopes and other large equipment to carry out the search.
When searching, place the cartridge close to the ground and move slowly along the direction of the cable.”nourish, nourish”When the discharge sound is the loudest, it is necessary to pay attention to safety when applying this method at the fault point. Special personnel should monitor the test equipment end and the cable end. Summary of high-voltage cable fault point finding methods High-voltage cable fault distance finder Shenzhen Noyafa Electronic Technology Co., Ltd.
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