MPP power protection tube construction requirements
With the rapid development of economic development, urban construction is increasingly updated, and power cables have entered into the ground from overhead. In order to meet the needs of the market, a new type of buried MPP power cable protection tube made of MPP power cable protection tube resin as a masterbatch, with impact agents, stabilizers and other auxiliary materials extruded at high speed has been developed to meet the needs of the market. The product has the characteristics of high strength, good flexibility, high temperature resistance, corrosion resistance, flame retardant, good insulation performance, no pollution, no aging, light weight, convenient construction and so on. Its various performance indicators have been tested and identified by national and provincial levels And certification, have reached or exceeded the level of similar products in China. The product performance is much better than the traditional asbestos cable exhaust pipe and ordinary MPP power cable protection tube. It is an ideal substitute for the traditional MPP power cable protection tube.Safety requirements for MPP power cable protection tubes
The MPP power cable protection tube has the characteristics of high temperature resistance and external pressure resistance, and is suitable for high voltage transmission line and cable exhaust pipe materials above 10KV. Trenchless engineering MPP power cable protection tube (modified polypropylene tube) is widely used in urban power cables, building water supply and drainage laying and other fields. Superior performance than commonly used MPP power cable protection tube, MPP power cable protection tube does not require excavation construction, pipe hot-melt welding flexible joint, high strength of welded joint, can drag tube with high length and high traction, good toughness, excellent resistance to ground settlement Earthquake resistance. Commonly used pipes are divided into ordinary type and reinforced type. The ordinary type is suitable for the excavation and laying construction and the non-excavation crossing construction with a buried depth less than 4M; the reinforced type is suitable for the non-excavation crossing construction with a buried depth greater than 4M.
Common faults of MPP power cable protection tube include mechanical damage, insulation damage, insulation moisture, insulation aging and deterioration, overvoltage, cable overheating failure and so on. When the above-mentioned fault occurs on the line, the power supply of the faulty cable should be cut off, the fault point is found, the fault is checked and analyzed, and then repaired and tested. After the fault is removed, the power supply can be restored after the fault is eliminated.
The safety requirements for MPP power cable protection tubes are:
1. When MPP power cable protection tubes cross each other, the high-voltage cable should be under the low-voltage cable. If one of the cables passes through the pipe protection or is separated by a partition within 1m before and after the intersection, the minimum allowable distance is 0.15m.
2. When the MPP power cable protection tube is close to or crosses the thermal pipeline, if heat insulation measures are taken, the minimum distance between parallel and cross is 0.5m and 0.15m, respectively.
3. When the MPP power cable protection tube crosses the railway or road, the protection tube should be worn, and the protection tube should extend beyond 2m from the track or road surface.
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