CN106058648A - Charged extensible bus system of ring main unit - Google Patents

Abstract

The invention discloses a charged extensible bus system of a ring main unit. The charged extensible bus system comprises an wire-outlet bus bar installed in the ring main unit, the wire-outlet bus bar is connected with a three-station switch, a static contact of the three-station switch is connected to a bus side bushing, and a fixed point of a moving contact is connected to the wire-outlet bus bar and an extensible side bushing of a bus to be extended and is correspondingly configured with another grounding static contact; the three-station switch is a three-station load switch and serves as a wire-outlet switch and a bus segment switch, the lower end of the wire-outlet bus bar is connected with a front EN 50181 standard wire-outlet bushing, the bus side bushing is connected with a basic bus and provided with a bushing interface, and the extensible side bushing is provided with an extensible interface; the charged extensible bus system is arranged in a gas chamber filled with SF6 gas, and an insulated plug capable of sealing the bushing is separately configured on the bus side bushing and the extensible side bushing. The charged extensible bus system is reasonable in structure, can accomplish bus extension consolidation under the power-on condition and the like.

Description

A live expandable busbar system of a ring network cabinet unit

technical field

The invention relates to a live and expandable bus bar system of a ring network cabinet unit, belonging to the technical field of internal bus bar structures of switchgear.

technical background

In recent decades, there have been no major breakthroughs in medium-voltage distribution switchgear technology at home and abroad, but improvements have been made in the direction of large capacity and high voltage, and some new explorations have been made in terms of insulation and arc-extinguishing media. In addition to changes in the structural form of medium-voltage distribution switchgear, the general trend is that the homogeneity is becoming more and more serious.

The ring main unit currently in operation must be powered off when the busbar is extended 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; at the same time, the old model ring main unit cannot solve the temporary power access problem for the 10kV emergency comprehensive bypass operation vehicle.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the existing technology, and provide a reasonable and compact structure, which can complete the operation of busbar expansion and cabinet consolidation without power failure, improve the reliability of power supply, and at the same time be able to operate for 10kV emergency comprehensive bypass The car provides a temporary power "socket", optimizes the distribution network planning scheme, saves costs, and avoids unnecessary waste of live and expandable busbar systems for ring main unit units.

The object of the present invention is accomplished through the following technical scheme, a live and expandable busbar system of a ring network cabinet unit, which includes an outgoing line busbar installed in the ring main unit unit, and the outgoing line busbar is connected with A three-position switch, in which the static contact of the three-position switch is connected to the bushing on the side of the busbar, and the fixed point of the moving contact is connected to the outgoing busbar and the expansion side bushing of the busbar to be expanded, and correspondingly equipped with another A static ground contact.

As a preference: the three-position switch adopts a three-position load switch and is used as an outlet switch and a bus section switch. The lower end of the outlet busbar is connected to the front EN 50181 standard outlet bushing, and the busbar side bushing is connected to the basic busbar and set Sleeve interface, the extension side sleeve has an expansion interface.

As a preference: the live expandable busbar system is placed in an air chamber filled with SF6 gas, and the bushing on the bus side and the bushing on the expansion side are respectively equipped with insulating plugs capable of sealing the bushings.

The present invention belongs to the improvement to prior art, and it has following beneficial technical effect:

1) Complete the busbar extension and cabinet consolidation operation without power failure, which improves the reliability of power supply;

2) Provide a temporary power "socket" for the 10kV emergency comprehensive bypass operation vehicle;

3) The distribution network planning scheme is optimized to save the initial construction cost.

Description of drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a wiring diagram of the system before expansion according to the present invention.

Fig. 3 is a wiring diagram of the expanded system of the present invention.

Fig. 4 is a schematic diagram of switch state changes before and after expansion according to the present invention.

detailed description

The present invention will be described in detail below in conjunction with accompanying drawing: As shown in Fig. 1, a kind of electrified expandable bus bar system of ring main unit unit of the present invention, it comprises an outlet busbar 1 that is installed in ring main unit unit, The outlet busbar 1 is connected with a three-position switch 2, wherein a static contact 3 of the three-position switch 2 is connected to the bushing 4 on the bus side, and the fixed point of the moving contact 9 is connected to the outlet busbar. On the row 1 and the expansion side bushing 5 of the busbar to be expanded, another static ground contact 6 is correspondingly arranged.

As shown in the figure, the three-position switch 2 adopts a three-position load switch and is used as an outlet switch and a bus section switch. 4 Connect the basic busbar and set the bushing interface, and the expansion side bushing 5 has an expansion interface.

The live expandable busbar system of the present invention is placed in an air chamber 8 filled with SF6 gas, and the busbar-side bushing 4 and the expansion-side bushing 5 are respectively equipped with insulating plugs capable of sealing the bushings .

Embodiment: As shown in Fig. 1, one end of the moving contact 9 is fixed on the outgoing line bushing and the side of the outgoing line bus bar. With the rotating movement of the moving contact 9, the three-position switch 2 can only be in one position at any time. state (open, closed, grounded), which completely eliminates the possibility of the switch being grounded in the closed position and closed in the grounded position. Secondly, before busbar expansion, we need to operate the load switch to the grounding position. At this time, the front outlet bushing 7 of the switch and the busbar bushing on the outlet side are grounded through the grounding bar and the switch shell, so the busbar expansion is absolute. safe.

When the live bus expandable ring network cabinet unit is a spare cabinet, assuming that the single-line diagram of the system is shown in Figure 2 and 3, in normal operation, all the switches on the left and the independent bus of this switch are charged, and the front bushing and The right busbar bushing is sealed with an insulating plug, and the switch is in the grounding position.

When expanding, after confirming that the grounding knife of the spare expansion cabinet is in the closed position, remove the insulating plug of the original outlet side busbar bushing, install the combined busbar and the newly added switchgear (see the appendix for the specific steps of combining cabinets) and cables.

Connect the test equipment, separate the grounding switch, carry out the withstand voltage test and cable test, and the main circuit resistance and insulation resistance tests can be carried out separately before combining the cabinets!

After the experiment is completed, separate the load switches of each outlet unit according to the requirements, close the original spare expansion switch, and then send power one by one, and the entire expansion project is completed!

The change of switch state before and after the expansion of the spare expansion switch is shown in Figure 4; if you just add a cable outlet to the original spare expansion cabinet, you only need to open the cable room door after confirming that the grounding switch is in the closed position, and install the cable head. After the test passes, Close the door of the cable room, separate the grounding switch, and close the load switch! This type of application is particularly convenient for the connection of emergency power sources that may be required.

Claims (3)

1. A live and expandable busbar system of a ring network cabinet unit, which includes an outgoing busbar installed in the ring network cabinet unit, characterized in that the outgoing busbar is connected to a three-position switch, wherein three The static contact of the position switch is connected to the bushing on the side of the busbar, and the fixed point of the moving contact is connected to the outgoing busbar and the bushing on the expansion side of the busbar to be expanded, and another grounding static contact is correspondingly configured. 2. The live expandable busbar system of the ring main unit unit according to claim 1, characterized in that the three-position switch adopts a three-position load switch and is used as an outgoing line switch and a bus section switch, and the lower end of the outgoing line busbar is Connected with the front EN50181 standard outlet bushing, the busbar side bushing is connected to the basic busbar and has a bushing interface, and the expansion side bushing has an expansion interface. 3. The live expandable busbar system of the ring main unit according to claim 1 or 2, characterized in that the live expandable busbar system is placed in an air chamber filled with SF6 gas, and the side cover of the busbar is Insulation plugs that can seal the casing are respectively arranged on the pipe and the expansion side casing.