A cable terminal switching device and a method for quickly switching power supply

Abstract

A cable terminal switching device comprises a metal voltage-sharing connector, an insulating support frame, a double-layer composite shielding type insulating tube, a metal outer protection tube and end sealing sleeves. The metal voltage-sharing connector is supported on the inner wall of the double-layer composite shielding type insulating tube through the insulating support frame, the end sealing sleeves sleeve the two ends of the double-layer composite shielding insulating tube, and the metal outer protection tube sleeves the double-layer composite shielding insulating tube. The double-layer composite shielding insulating tube is formed by the double-layer composite molding of an insulating material and a conductive material, has no gap in the middle, and is in a circular tube shape. The metal voltage-sharing connector is of a cylindrical structure formed by splicing two sections, and a plurality of threaded holes used for being connected with terminal fittings are formed in the metal voltage-sharing connector. The invention further provides a power supply method using the device. According to the invention, the high-voltage cable incoming and outgoing cable cold shrink type terminal connection can be rapidly realized in short time, and the rapid power supply is realized.

Description

technical field [0001] The invention relates to the field of power cables, in particular to a cable terminal switching device and a fast switching power supply method. Background technique [0002] The 10kV distribution network high-voltage cable line covers a large area, the network is complex, the equipment is diverse, and the site environment is special. The workload of planned maintenance and emergency repair is heavy, which will inevitably cause power outages for users. Domestic power grid companies often adopt the maintenance method of "one line is pulled, one line is stopped for a large area", which can no longer meet the electricity demand of the society. In particular, during planned maintenance and emergency repair of the ring main unit, the cold-shrinkable terminal of the high-voltage cable is too close to the ground, the electrical insulation distance is not enough, and there is no connection method that is small in size and fully insulated for safety protection....

AI Technical Summary

Problems solved by technology

[0002] The 10kV distribution network high-voltage cable line covers a large area, the network is complex, the equipment is diverse, and the site environment is special. The workload of planned maintenance and emergency repair is heavy, which will inevitably cause power outages for users

Domestic power grid enterprises often adopt the maintenance method of "one line is pulled, one line is stopped for a large area", which can no longer meet the electricity demand of the society

In particular, during planned maintenance and emergency repair of the ring main unit, the cold-shrinkable terminal of the high-voltage cable is too close to the ground, the electrical insulation distance is not enough, and there is no connection method that is small in size and fully insulated for safety protection. Power off the incoming high-voltage cables until the construction is complete, and then connect the ring network cabinet to restore the power supply. At this time, the outgoing high-voltage cables must also be completely powered off on the user side, and the power supply will not be restored until the construction is completed.

However, the reality is that power supply needs to be maintained for some important customers. At this time, only a very short period of emergency treatment is allowed. However, it is difficult to solve the problem and restore power supply in a short period of time with the existing maintenance methods.

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