The wire and cable is the focus of the relevant department inspection. Many friends may have questions. Why is this? Because the wire cable is a product that affects the safety of personal and property. The wire and cable also have a specialized staff for regular inspection. If the electric wire cable is the focus of relevant department inspection, many friends may have questions. Why is this? Because the wire cable is a product that affects the safety of personal and property. The wire and cable also have a special staff for regular inspection. If it is discovered, it is necessary to quickly find the fault point and then maintain it.
Let's take the cable fault detector manufacturers to some of the technical cable fault detection and maintenance. Cable fault detector manufacturers summarize cable fault detection small knowledge: 1. What program cable fault detection and positioning? 1. Judgment the cable fault nature; there must be high resistance measuring tables and multimeter in the step. 2, a predetermined location, a rough measurement of the distance from the cable, which requires a high voltage bridge, a pulse reflector or a high pressure wave reflection method.
3, the positioning cable path, detect the unidentified cable path, which requires a pipe locator. 4, accurately positioning, according to the predetermined position, combined with the cable path, accurately determine the location of the cable fault point, the specific position of the fault point is determined, and the error is allowed to be 0.1 meters. This step requires a sound magnetic time difference method, step voltage method or small distortion method.
Second, the classification of cable faults? Determine the cable fault nature, depending on its position, it can be divided into cable main insulation faults and cable outer sheath faults. According to the main insulation failure of the cable, it divides it into: low-resistance, low-resistance, high-resistance, high-resistance failure, high resistance short-circuit fault, flashing fault, leak failure, intermittent fault, etc. Third, what is the deadline failure? How to deal with ground faults? Introduction to the cable fault detector manufacturers We can know that when the cable fails, the interposed insulation resistance of the cable is 0.00-10.00 ohm, the cable professionals are called“Dead ground failure”Also known as“Zero resistance”or“Permanent ground fault”.
When the grounding failure point insulation resistance is very low or even zero, even if the impact energy and the impact voltage will make the fault point discharge weak or cannot be discharged, the accurate positioning of the fault point is very difficult. Fourth, what fault is called the main insulation failure? The cable structure is inwardly inwardly: the core, the insulating layer, the copper shielding layer, the inner liner, the armor layer, and the outer sheath. The optical cable insulating layer and the outer insulating layer may occur in an insulated breakdown failure, and the cable professionals break through the cable insulated breakdown (oil paper or cross-linking insulating layer) is referred to as cable main insulation failure.
5. How to control the boost range according to the leakage current value of the fault cable? After the cable is faulty, the cable running unit should apply a moderate pulse high pressure on the failed cable. The problem that considers is that if the applied pulse is too high, the cable life may be shortened; if the pulse is too low, it cannot be completely broken down on the fault point. Therefore, it is important to appropriately select the boost range.
The above is the dry-saving sharing of cable fault detector manufacturers, hoping to bring some help to people need.
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