Why would a high voltage electric cable water?
High voltage electric cable water, generally because of three reasons:
1. In the cable production process, the inner liner pull extrusion unglued or loopholes, watering when the water cooled sink, production workers did not pay attention, or found it but not timely handled it. (If the water in the production process, the finished cable partial discharge test is greater than the index inevitable 10pC, cable is impossible qualified)
2. After high voltage electric cable produced, cable end sealing cap is not ready, place in the open air and rain water into the internal cables.
3. When high voltage electric cable laying, cable has been truncated, but neither made cable terminal head in time, nor bandage sealed. With watered in cable trench, resulting in an unsealed cable water.
For XLPE high voltage electric cable, the cable inside watered, especially the water inside the inner liner, it is very dangerous, because XLPE insulation afraid of water, under the influence of high voltage electric field, the water will make XLPE insulation water trees again produce electrical trees, resulting in cable insulation breakdown.
If the water is caused by the cable manufacturer, you can contact the manufacturer to replace the cable to ensure proper use of the cable.
If the result of improper storage or water due to construction negligence, vacuum methods can be used to drain the water in the cable, that is, to do with the cable inlet section of the valve core cable sealing cap, the inner core removed, sealing cap with the cable jacket seal with a vacuum pump and valve core connection, pumping out the water inside the cable; the other end of the cable to do the same sealing cap (with the valve core) and add a valve, internal cable to be evacuated to a certain degree of vacuum, dry air into the valve opening. Vacuum - the intake valve open - close the vacuum valve - open the intake valves - vacuum ........ this is repeated several times until the internal cables damp parts dry. Too much trouble, but there is no other good way. Practice has proved that this approach is indeed feasible.