CN208015209U - Voltage switchgear is pressed in one kind - Google Patents

Abstract

The utility model discloses a medium-voltage complete switchgear, which comprises a cabinet body, which is divided into a busbar room, a cable room, a switch room and a low-voltage instrument room inside, a total of 4 compartments, and metal partitions are passed between the compartments. Completely enclosed and separated; there is a pressure relief channel on the top of the busbar room, cable room and switch room, and there are contact boxes in the bus room and cable room, and the two contact boxes are respectively fixed between the bus room and the switch room The metal partition between the cable room and the switch room, the circuit breaker handcart is connected to the branch bus in the bus room and the branch bus in the cable room through the static contacts in the contact box, and the main bus is installed in the bus room. , The junction of the main busbar is provided with a busbar lap box, the main busbar is fixed on the cabinet body through supporting insulators, and one end of the main busbar protrudes out of the cabinet through the busbar bushing installed on one side of the busbar room. The overall insulation level of the utility model is obviously higher than that of 12kV common cabinet type, and the cost is obviously lower than that of 24kV products.

Description

A medium voltage complete switchgear

technical field

The utility model relates to a medium-voltage complete switch cabinet, which belongs to the technical field of medium-voltage power distribution equipment.

Background technique

The medium voltage switchgear is a kind of power distribution equipment used in the power transmission and transformation system, which is responsible for the transmission, distribution and control of electric energy. The insulation performance parameters and reliability of the switchgear depend on the selected insulation structure, and the product cost also depends to a large extent on the selected insulation structure. At present, for international engineering projects with a rated voltage of 15kV and a domestic market with an altitude of 2,500 meters or less, ordinary 12kV products are used, and the insulation level does not meet the requirements. Generally, products with a rated voltage of 24kV are used in a large-to-small mode. processing is costly.

Contents of the invention

The technical problem to be solved by the utility model is: to provide a medium-voltage complete set of switchgear whose overall insulation level is obviously higher than that of the 12kV common cabinet type and the cost is obviously lower than that of the 24kV product, which solves the problem of the rated voltage of 15kV and 15kV in international engineering projects. The domestic market demand for two areas below 2,500 meters above sea level, ordinary 12kV products are used, the insulation level cannot meet the requirements, and products with a rated voltage of 24kV are used to deal with the problem of high cost.

In order to solve the above-mentioned technical problems, the technical solution of the utility model is to provide a medium-voltage complete switchgear, which is characterized in that it includes a cabinet body, and the inside of the cabinet body is divided into a busbar room, a cable room, a switch room and a low-voltage instrument room. 4 compartments, each compartment is completely closed and separated by metal partitions; there is a pressure relief channel on the top of the busbar room, cable room and switch room, and the busbar room and cable room are equipped with contact boxes. The two contact boxes are respectively fixed on the metal partition between the bus room and the switch room, and on the metal partition between the cable room and the switch room. , The branch bus in the cable room is connected. There is a main bus in the bus room. A bus lap box is provided at the joint of the main bus. The main bus is fixed on the cabinet through a supporting insulator. The busbar bushing extends out of the cabinet.

Preferably, a current transformer, a grounding switch, and a cable connection busbar are arranged in the cable chamber, and the grounding switch and the cable connection busbar are all connected to the current transformer.

Preferably, the main bus bar in the bus bar room is a rectangular bus bar, and the main bus bar is composed of a single or double bus bars connected in parallel according to the ampacity.

Preferably, the contact box is a three-phase integrated structure, the support insulator is a large creepage insulator, and the busbar splice box is a closed structure.

Preferably, the bus bushing is an internal pressure equalizing and external shielding structure, the inner wall surface of the bus bushing is a conductor, and a lead wire is provided on the inner wall surface of the bus bushing, and the lead wire is connected to the bus bar passing through the bus bushing.

Preferably, each pressure relief channel is provided with a pressure relief cover plate.

Preferably, the pressure relief cover is a reverse pressure relief cover.

The overall insulation level of the utility model is obviously higher than that of 12kV common cabinet type, and the cost is obviously lower than that of 24kV products. The contact box of the utility model is a three-phase integrated structure, which is injection molded by epoxy resin mixture. The support insulator is a large creepage distance insulator, which increases the creepage distance to the ground and solves the defect of easy discharge between phases and phases; There is a lead wire connected to the busbar passing through it, so that the inner wall of the bushing and the busbar have the same potential, which solves the defect that the gap between the inner wall of the bushing and the busbar is strong and easy to discharge; the busbar lap box is a closed structure, which can connect the busbar The bolts at the row connections are shielded to prevent tip discharges. The main switch room, busbar room, cable room and low-voltage room are completely separated by metal partitions, so that the maintenance and replacement of one compartment will not affect other compartments, and the modularization is truly realized according to the function.

Description of drawings

Figure 1 is a schematic diagram of the compartment distribution of a medium-voltage complete switchgear;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is a schematic diagram of the internal structure of a medium-voltage complete switchgear.

Detailed ways

In order to make the utility model more comprehensible, preferred embodiments are described in detail below with accompanying drawings.

The utility model is a medium-voltage complete switch cabinet, as shown in Fig. 1-Fig. 3, which includes two parts: a fixed cabinet body 1 and a circuit breaker handcart 6 which can be drawn out. The interior of cabinet 1 is divided into four compartments: busbar room A, cable room B, switch room C and low-voltage instrument room D. The compartments are completely closed and separated by metal partitions; in busbar room A and cable room B There is a pressure relief channel 2 on the top of the switch chamber C, and each pressure relief channel 2 is equipped with a pressure relief cover 3. The pressure relief cover 3 is a flip-type pressure relief cover. When an arc fault occurs, the air pressure generated by the fault arc will open the pressure relief cover 3, so that the scorching gas can be quickly discharged out of the cabinet. The circuit breaker trolley 6 is located in the switch room C.

The primary components such as current transformer 12, grounding switch 14, and cable connection busbar 13 are arranged in the cable room B. The grounding switch 14 and cable connection busbar 13 are connected to the current transformer 12, and the current transformer 12 is connected to the branch busbar 10. One end of the branch bus bar 10 is connected to the static contact 11 in the contact box 5 .

One end of the branch bus 10 in the bus room A is connected to the main bus 7 , and the other end of the branch bus 10 is connected to the static contact 11 .

Both the busbar room A and the cable room B are equipped with contact boxes 5, and the two contact boxes 5 are respectively fixed on the metal partition between the busbar room A and the switch room C, and the metal partition between the cable room B and the switch room C. On the partition, the circuit breaker trolley 6 is connected to the branch busbars 10 in the busbar chamber A and the cable chamber B respectively through the static contacts 11 in the contact box 5 . The main busbar 7 in the busbar room A is a rectangular busbar, which can be composed of single or double busbars connected in parallel according to the ampacity. The joint of the main busbar 7 is provided with a busbar splice box 8. The main busbar 7 is fixed on the cabinet body 1 through the supporting insulator 9, and one end of the main busbar 7 protrudes out of the cabinet body 1 through the busbar bushing 4 installed on one side of the busbar room A.

The contact box 5 is a three-phase integrated structure, which is injection-molded with epoxy resin mixture. The support insulator 9 is a large creepage insulator, which increases the creepage distance to the ground. The bus bushing 4 is an internal pressure equalizing and external shielding structure. The inner wall surface of the bus bushing 4 is a conductor, and a lead wire is provided on the inner wall surface of the bus bushing 4 . The busbar splice box 8 is a closed structure, which can shield the bolts at the busbar connection and prevent tip discharges from occurring.

Among them, the structure of the three-phase integrated contact box 5 is that there are three wedge-shaped insulating boxes arranged in a line on a rectangular base, each insulating box has a metal insert at the bottom, and the outer side of the insulating box has an umbrella skirt. The end near the metal insert has vertical channels.

The structure of the pressure-equalizing busbar bushing 4 is an elliptical cross-sectional shape. There is a layer of metal film on the inner wall surface of the bushing and a lead wire; there is also a layer of metal mesh inside the bushing wall, which is made of epoxy The resin mixture material is poured and molded. There is a rectangular mounting surface in the middle of the oval barrel.

The shape of the support insulator 9 with a large creepage distance is basically the same as that of a common insulator, and the creepage distance is made larger by means of increasing the number of sheds and changing the height dimension.

Claims (7)

1. pressing voltage switchgear in one kind, which is characterized in that including cabinet (1), bus-bar room (A), electricity are divided into inside cabinet (1) Cable room (B), switch gear room (C) and low pressure control room (D), totally 4 compartments, between each compartment by metal partion (metp) it is completely enclosed every It opens；It is respectively provided with 1 pressure release passage (2), bus-bar room (A), cable vault at the top of bus-bar room (A), cable vault (B) and switch gear room (C) (B) be equipped with contact box (5) in, two contact boxs (5) be individually fixed in the metal between bus-bar room (A) and switch gear room (C) every On metal partion (metp) between plate, cable vault (B) and switch gear room (C), circuit breaker cart (6) passes through the static contact in contact box (5) (11) it is connected respectively with the branch bar (10) in bus-bar room (A), cable vault (B), main bus-bar (7) is equipped in bus-bar room (A), it is main The joint of busbar (7) is equipped with busbar shiplap joint box (8), and main bus-bar (7) is fixed on by supporting insulator (9) on cabinet (1), main Cabinet (1) is stretched out outside in one end of busbar (7) by being mounted on the bus casing (4) of the side bus-bar room (A).

2. pressing voltage switchgear in one kind as described in claim 1, which is characterized in that is disposed in the cable vault (B) Current transformer (12), earthing switch (14), cable connection busbar (13), earthing switch (14), cable connection busbar (13) are equal It is connect with current transformer (12).

3. pressing voltage switchgear in one kind as described in claim 1, which is characterized in that described bus-bar room (A) the interior main bus-bar (7) it is square type busbar, main bus-bar (7) is single or double joint busbar according to current-carrying capacity size and connects composition.

4. pressing voltage switchgear in one kind as described in claim 1, which is characterized in that the contact box (5) is three-phase one Body formula structure, supporting insulator (9) are large distance insulator, and busbar shiplap joint box (8) is enclosed construction.

5. pressing voltage switchgear in one kind as described in claim 1, which is characterized in that the bus casing (4) is interior equal External shield type structure is pressed, the inner wall surface of bus casing (4) is conductor, and the inner wall surface of bus casing (4) is equipped with a lead, The lead is connect with the busbar across bus casing (4).

6. pressing voltage switchgear in one kind as described in claim 1, which is characterized in that on each pressure release passage (2) It is both provided with pressure release cover board (3).

7. pressing voltage switchgear in one kind as claimed in claim 6, which is characterized in that the pressure release cover board (3) is overturning Formula pressure release cover board.