Extensible type ring main unit with no-break power supply on two sides

Abstract

The invention discloses an extensible type ring main unit with no-break power supply on two sides, the ring main unit is suitable for being used in a distributing line in which ring network power supply is achieved, and the ring main unit has the advantages of being full-sealed, full-insulated, extensible and capable of using one box body. A base bus, two sections of to-be-extended buses and a three-position switch are arranged in the ring main unit, the two sections of to-be-extended buses are respectively arranged at two ends of the base bus, the two sections of to-be-extended buses are respectively connected with a moving contact of the three-position switch, and a fixed contact of the three-position switch is connected with the base bus. When ring main units are connected, under the condition of no-break power supply, through a switching operation, the three-position switch is powered off, the moving contact is turned to a grounding position, the effect that the to-be-extended buses and a coil out side are dead and are grounded reliably is ensured, a bus, which needs to be extended, of an extensible type ring main unit, is connected with the to-be-extended buses, and then the ring main unit connection operation is finished. Under an existing power distribution network, power supply reliability can be improved, distribution network investment cost can be saved, and convenient and fast high-voltage power supply can be provided for an emergency bypass work vehicle.

Description

technical field [0001] The invention relates to a switchgear combination, namely an expandable ring network cabinet with uninterrupted power supply on both sides. Background technique [0002] Such as figure 1 As shown, the current ring network cabinets are units with only a single function, and the running ring network cabinets must be powered off when they are expanded to combine cabinet operations. Power outage operations will inevitably increase the number of households during power outages, which is not conducive to the improvement of reliability indicators. According to statistics, the power outage time required for power outage and cabinet construction accounts for about 7% of the total power outage time, and with the wider use of ring network cabinets and the continuous reduction of power outage time caused by other conditions, its proportion will increase year by year rising. Therefore, it is necessary to develop a new type of expandable ring main unit that can p...

AI Technical Summary

Problems solved by technology

[0003] According to the existing distribution network planning, it is generally necessary to reserve 4-6 power distribution spare cabinets of the same type in the power distribution room for use in future business expansion projects or network transformation projects, which will cause large resources waste

[0004] When the 10kV (20kV) emergency bypass operation vehicle is working, it is difficult to receive a 10kV (20kV) high-voltage power supply in the power distribution room, which will inevitably increase the difficulty of the operation

Images