Method for increasing supply voltage type of high-voltage power cable

Abstract

Disclosed is a method for increasing the supply voltage type of a high-voltage power cable. The method includes the steps of adding a metal sleeve at the position with the radius being c in an insulation layer of a cylindrical single-core high-voltage power cable; enabling the center of a normal projection circle of the metal sleeve to coincide with the center of a circle of a conductor; connecting a metal sleeve built in the cylindrical single-core high-voltage power cable to a low-voltage device in a switch cabinet through a wiring terminal to serve as a low-voltage AC power supply to powerthe low-voltage device; and other steps. The invention has the effects that the low-voltage AC power supply required by the low-voltage device in the switch cabinet is connected directly from the built-in metal sleeve of the high-voltage cable, a low-voltage system in the original substation can be reduced, and the costs of a station transformer, a low-voltage AC panel and other equipment can be saved; the number of control cables and material and construction costs thereof are greatly reduced, and the construction investment cost for a power transmission and transformation project is effectively lowered; and the accident risk of the loss of power of the low-voltage device in the switch cabinet due to a fault of the low-voltage power supply in the substation can be eliminated.

Description

technical field [0001] The invention belongs to the technical field of electric power supply, and in particular relates to a method for increasing the type of voltage supplied by a high-voltage power cable. Background technique [0002] The currently commonly used cylindrical single-core high-voltage power cables mainly include a conductor, an insulating layer covering the outside of the conductor, and a grounding metal shielding layer covering the outside of the insulating layer. But this traditional cylindrical single-core high-voltage power cable can only provide one working voltage, which determines the thickness of the insulating layer, and is proportional to the logarithm of the thickness of the insulating layer in value. For the switchgear arranged at both ends of the high-voltage power cable, the power required by the various low-voltage devices inside cannot be directly supplied by the cable, and the low-voltage power supply in the substation needs to be connected. ...

AI Technical Summary

Problems solved by technology

This will bring two problems: first, it will cause the secondary wiring in the substation to be complicated, and the materials and construction of the wiring will increase the investment cost; second, if the low-voltage power supply in the substation fails, it will cause all the devices in the switch cabinet Power failure may easily lead to misoperation or refusal of the switch, which will expand the scope of the accident and cause unnecessary losses

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