Electrified repair device for cross-inked polyethylene power cable and electrified repair method thereof

Abstract

The invention discloses an electrified repair device for a cross-inked polyethylene power cable and an electrified repair method thereof. The device is characterized in that the device comprises a repair hydraulic pressure injection system, a vacuum pumping system as well as repair liquid adapters (13, 15) and taps (12, 16) which are positioned at both ends of a cable, wherein the repair liquid adapter (13) at one end of the cable is connected with the repair hydraulic pressure injection system through the tap (12), and the repair liquid adapter (15) at the other end of the cable is connected with the vacuum pumping system through the tap (16); the repair hydraulic pressure injection system is that an air compressor (1), a gas water-absorbing tank (4) and a repair liquid tank (11) are orderly connected with the tap (12) and the repair liquid adapter (13); and the vacuum pumping system is that the repair liquid adapter (15), the tap (16), a residual liquid collection bottle (17), a filtering tank (19) and a vacuum aspirator (20) are orderly connected.

Description

technical field [0001] The invention relates to a live repairing device for a cross-linked polyethylene power cable and a live repair method thereof, in particular to a live repair method for a medium-voltage (6kV-35kV) cross-linked polyethylene (XLPE) power cable. It can be used in the repair project of aging cables after long-term operation. Background technique [0002] Cross-linked polyethylene (XLPE) power cables are widely used in my country's electric power industry because of their reliable electrical and mechanical properties. In the early 1990s, my country carried out a large number of urban network reconstruction work, and a large number of medium-voltage cables began to be applied to urban power grids. However, due to the poor waterproofness of early cables, it is often easy to cause cable water trees. With the further development of water trees, electrical trees are formed, which leads to the rapid development of cable defects, and finally leads to the failure ...

AI Technical Summary

Problems solved by technology

But above-mentioned technology has the following deficiencies: (1) along with the outflow of inert gas in the gas pressure tank, its pressure reduces, if long-term use then can't guarantee the constant of repair fluid injection pressure, has weakened repair effect; (2) this patent does not Involves the method of extracting the repair liquid, the repair liquid flows slowly, and for long cables, the injection effect will be limited, and there is no device at the end of the cable to collect and discharge the repair liquid; (3) There is no mention of how the injection adapter is sealed under high pressure Problems ("A new method to extend the service life of XLPE medium-voltage cables-cable repair fluid injection technology" - "Tianjin Electric Power Technology" 2003 the first issue); (4) The reaction time required for the repair fluid is too long, and it takes a long time Time immersion increases the maintenance time of cable power outages, and its technology is not perfect

The advantages of this design are obvious, but its internal structure is complicated, the production cost is high, and the price is expensive; US7353601B1 discloses a complete method for power cable repair, which requires first cutting off the power and replacing the original connector with a high voltage Then inject a certain amount of dielectric enhancing liquid, and set different repair parameters according to the repair environment, and finally achieve the purpose of extending the life of the cable

This repair method is particularly complicated and requires high precision and assembly of repair equipment

The above-mentioned technology is difficult to popularize and apply

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