Totally enclosed medium voltage circuit breaker cabinet

Abstract

A kind of fully-enclosed medium voltage circuit breaker cabinet, including cabinet, the top of cabinet is provided with bus side disconnecting switch, middle part is provided with circuit breaker and voltage transformer, bottom is provided with load side disconnecting switch, bus side disconnecting switch, circuit breaker and voltage transformer are electrically connected, voltage transformer and load side disconnecting switch are electrically connected, the top of cabinet is provided with closed outer frame, and left mounting plate and right support frame connected together, closed outer frame is placed in left mounting plate and bus side disconnecting switch, and is connected with left mounting plate and right support frame, left mounting plate is inclined and used to install bus side disconnecting switch, and get the through port of the connection line passing through allowing and circuit breaker and bus side disconnecting switch electrically connected.The beneficial effects of the utility model lie in, by the inclined installation of bus side disconnecting switch, it is not necessary to utilize the increase cabinet volume, also make arc-extinguishing tube also close to through port, so that subsequent bus side disconnecting switch and circuit breaker electric connection work are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of electrical technology, and in particular to a fully enclosed medium-voltage circuit breaker cabinet. Background Technology

[0002] Medium-voltage circuit breaker cabinets, also known as medium-voltage switchgear, are an extremely important type of power distribution equipment in power systems. They are specifically designed for the safe control, protection, measurement, and isolation of medium-voltage power circuits ranging from 3.6kV to 40.5kV.

[0003] Existing medium-voltage circuit breaker cabinets use isolated power supplies at both ends: one is the power supply from the busbar on the busbar side, and the other is the power supply from the load side or cable line, which may carry induced voltage, reverse power supply, or reverse power supply from another power source, in order to meet the "five protections" requirements. However, the existing busbar-side disconnecting switch is generally placed flat on the top of the cabinet, and the volume of the cabinet is increased to avoid the arc-extinguishing tube of the disconnecting switch being close to the cabinet door, resulting in a large cabinet volume, large installation space, increased area of ​​high-voltage power distribution room, and high investment cost. Utility Model Content

[0004] This invention aims to overcome the shortcomings of the prior art by providing a fully enclosed medium-voltage circuit breaker cabinet to solve the aforementioned problems.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: This fully enclosed medium-voltage circuit breaker cabinet includes a cabinet body. A busbar-side disconnect switch is installed at the top of the cabinet body, a circuit breaker and a voltage transformer are installed in the middle, and a load-side disconnect switch is installed at the bottom. The busbar-side disconnect switch, the circuit breaker and the voltage transformer are electrically connected, and the voltage transformer and the load-side disconnect switch are electrically connected. A closed outer frame is installed at the top of the cabinet body, and a left mounting plate and a right support frame are connected together. The closed outer frame allows the left mounting plate and the busbar-side disconnect switch to be placed inside, and is connected to the left mounting plate and the right support frame. The left mounting plate is inclined and used to install the busbar-side disconnect switch, while providing an opening for the connecting wires that are electrically connected to the circuit breaker and the busbar-side disconnect switch to pass through.

[0006] Further improvements were made, with the end of the closed outer frame furthest from the right support frame tilted outwards.

[0007] Further improvements include setting the left mounting plate as a plate-shaped component, which is bent to form a first closed outer frame abutment part, a busbar-side disconnector mounting part, and a closed outer frame connecting part. The first closed outer frame abutment part abuts against the closed outer frame, and the closed outer frame connecting part connects to the closed outer frame to maintain the inclined state of the busbar-side disconnector mounting part, while simultaneously obtaining an opening. The busbar-side disconnector mounting part is used to install the busbar-side disconnector.

[0008] Further improvements include setting the right support frame as a plate-like component, which is bent to form a second closed outer frame abutment part and a cabinet connecting part. The second closed outer frame abutment part abuts against the closed outer frame, and the cabinet connecting part connects to the cabinet.

[0009] Further improvements include the cabinet having two doors arranged vertically, one above the other. The operating switches for the bus-side disconnect switch and the load-side disconnect switch are both located on the cabinet panels with the doors, and are also symmetrically arranged vertically. A protective mechanism is provided between the cabinet doors and the corresponding operating switches to prevent the cabinet doors from opening when the operating switches for the two disconnect switches are not turned on.

[0010] Further improvements include a cabinet door fixing block with a connecting strap and a cabinet body fixing block that engages with the connecting strap. The cabinet body fixing block has a connecting protrusion, and the connecting strap has a socket for inserting into the connecting protrusion. The operating handle of the control switch has a pressing part that presses against the connecting strap and prevents the connecting strap from detaching from the connecting protrusion.

[0011] Further improvements include an extension rod and a pressure block. The extension rod is fixed to the operating handle of the control switch, and the pressure block is fixed to the end of the extension rod that is not fixed to the operating handle of the control switch.

[0012] The beneficial effects of this utility model are: 1. This utility model tilts the busbar-side disconnect switch so that it can not only be away from the cabinet door, but also close the gap between it and the circuit breaker. In this way, there is no need to increase the cabinet size, and the arc extinguishing tube is also close to the opening, which also facilitates the subsequent electrical connection between the busbar-side disconnect switch and the circuit breaker. 2. The cabinet door of this utility model is equipped with a protection mechanism. When the operating handle of the isolating switch is in the closed state, the protection mechanism prevents the cabinet door from being opened, thus preventing users from operating it while it is energized and achieving a good protection effect. Attached Figure Description

[0013] Figure 1 This is a structural schematic diagram of the present invention, which hides the closed cabinet panels in other locations of the cabinet body except for the cabinet door; Figure 2 This is a schematic diagram of the structure of this utility model; Figure 3 The following is a structural schematic diagram of this utility model; Figure 4 This is a schematic diagram of the structure of the protection mechanism of this utility model. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings: Referring to the attached diagram: This fully enclosed medium-voltage circuit breaker cabinet includes a cabinet body 1. The top of the cabinet body 1 is equipped with a busbar-side disconnector 2, the middle is equipped with a circuit breaker 3 and a voltage transformer 4, and the bottom is equipped with a load-side disconnector 5. The busbar-side disconnector 2, the circuit breaker 3 and the voltage transformer 4 are electrically connected, and the voltage transformer 4 and the load-side disconnector 5 are electrically connected. The top of the cabinet body 1 is equipped with a closed outer frame 6, a left mounting plate 7 connected together, and a right support frame 8. The closed outer frame 6 houses the left mounting plate 7 and the busbar-side disconnector 2 and is connected to the left mounting plate 7 and the right support frame 8. The left mounting plate 7 is inclined and used to install the busbar-side disconnector 2, while also having an opening 9 that allows the connecting wires electrically connected to the circuit breaker 3 and the busbar-side disconnector 2 to pass through. The principle of this utility model is that the left mounting plate 7 is used to install the bus-side disconnect switch 2. After installation, the bus-side disconnect switch 2 is set at an angle. The angle makes the extension direction of the arc-extinguishing tube of the bus-side disconnect switch 2 also oblique. This not only keeps it away from the cabinet door 11, but also reduces the distance between it and the circuit breaker. In this way, it is not necessary to increase the volume of the cabinet 1 to increase the distance between the arc-extinguishing tube of the disconnect switch and the cabinet door 11. Furthermore, the setting of reducing the distance between it and the circuit breaker makes the arc-extinguishing tube closer to the opening 9, which also facilitates the subsequent electrical connection between the bus-side disconnect switch 2 and the circuit breaker 3. The enclosed outer frame 6 houses the left mounting plate 7 and the bus-side disconnect switch 2. Combined with the right support frame 8, it ensures the assembly stability of the left mounting plate 7 within the enclosed outer frame 6, and also ensures the setting stability of the bus-side disconnect switch 2. After the enclosed outer frame 6, the left mounting plate 7, and the right support frame 8 are installed, they will be sealed again to ensure the airtightness of the cabinet.

[0015] The end of the closed outer frame 6 away from the right support frame 8 is tilted outward. This setting allows the volume of the closed outer frame 6 to be appropriately increased. While matching the configuration of the left mounting plate 7, it also provides guidance. Thus, when the left mounting plate 7 enters into the closed outer frame 6, it only needs to enter in a straight downward direction without much adjustment. After the left mounting plate 7 moves to the connection point with the closed outer frame 6, it can stop moving and then be fixed with bolts.

[0016] The left mounting plate 7 is configured as a plate-shaped component, which is bent to form a first closed outer frame abutment part 71, a busbar-side disconnector mounting part 72, and a closed outer frame connecting part 73. The first closed outer frame abutment part 71 abuts against the closed outer frame 6, and the closed outer frame connecting part 73 connects to the closed outer frame 6 to maintain the inclined state of the busbar-side disconnector mounting part 72, and at the same time obtains an opening 9. The busbar-side disconnector mounting part 72 is used to install the busbar-side disconnector 2. This configuration makes the left mounting plate 7 have a part for installing the busbar-side disconnector 2, a part for connecting to the closed outer frame, and a part for abutting against the closed outer frame, eliminating the need for connecting parts. This configuration only requires the closed outer frame connecting part 73 to be connected to the closed outer frame 6 by bolts. The first closed outer frame abutment part 71 only needs to be abutted against the closed outer frame 6 by adapting its width dimension. This reduces the installation steps and ensures that the left mounting plate 7 for installing the busbar-side disconnector 2 is stably set inside the closed outer frame 6.

[0017] The right support frame 8 is configured as a plate-shaped component, which is bent to form a second closed outer frame abutment part 81 and a cabinet connecting part 82. The second closed outer frame abutment part 81 abuts against the closed outer frame 6, and the cabinet connecting part 82 is connected to the cabinet 1. The position where the second closed outer frame abutment part 81 abuts against the closed outer frame 6 is also the part where the closed outer frame 6 abuts against the left mounting plate 7. After abutting, the second closed outer frame abutment part 81 is welded to the closed outer frame 6, which can increase the structural strength of this part, so that it has a good support effect and will not deform under stress.

[0018] Cabinet 1 has two cabinet doors 11 arranged vertically. The operating switches of bus-side disconnect switch 2 and load-side disconnect switch 5 are both located on the cabinet panel of cabinet 1 with cabinet doors 11, and are also symmetrically arranged vertically. A protection mechanism 10 is provided between cabinet door 11 and the corresponding operating switch so that cabinet door 11 cannot be opened when the operating switches of the two disconnect switches are not open. The protection mechanism 10 is used to prevent cabinet door 11 from being opened when the operating handle is not in the open state. In this way, the operator will not be able to work in a non-power-off state, thereby achieving the purpose of protection.

[0019] The protection mechanism 10 includes a cabinet door fixing block 101 with a connecting strap 1011 and a cabinet body fixing block 102 that is inserted into the connecting strap 1011. A connecting protrusion 1021 is formed on the cabinet body fixing block 102. An insertion port 10111 for inserting into the connecting protrusion 1021 is provided on the connecting strap 1011. A pressing part 20 is provided on the operating handle of the control switch, pressing against the connecting strap 1011 and preventing the connecting strap 1011 from disengaging from the connecting protrusion 1021. The cabinet door fixing block 101 with the connecting strap 1011 and the cabinet body fixing block 102 with the connecting protrusion 1021 constitute the protection mechanism for opening the cabinet door 11. The cabinet door fixing block 101 is fixedly installed on the cabinet door 11 by bolts. 1011 is constrained on the cabinet door fixing block 101 by a connecting piece that is threadedly engaged with the cabinet door fixing block 101, and is rotatable. The connecting protrusion 1021 is integrally formed on the cabinet fixing block 102, and the cabinet fixing block 102 is also fixedly installed on the cabinet 1 by bolts. The connecting strip 1011 is inserted into the connecting protrusion 1021 through its own formed insertion port 10111, which can generate a restraining effect to prevent the cabinet door 11 from opening. The pressing part 20 is used to prevent the connecting strip 1011 from disengaging in the direction opposite to the direction of insertion into the connecting protrusion 1021. This achieves the purpose of preventing the cabinet door 11 from being opened when the operating handle is not in the open state, avoiding the user's operation with electricity, and providing a good protection effect. In this embodiment, both the bus-side disconnect switch 2 and the load-side disconnect switch 5 adopt dual-operation switches. Although the protection mechanism 10 is only set on the operating handle of one of the operating switches near the cabinet door 11, the core design of the dual-operation mechanism is to force the user to operate both operating handles at the same time to avoid missing one when one is opened. Therefore, only one protection mechanism 10 needs to be set.

[0020] The pressure part 20 includes an extension rod 201 and a pressure block 202. The extension rod 201 is fixed to the operating handle of the control switch, and the pressure block 202 is fixed to the end of the extension rod 201 that is not fixed to the operating handle of the control switch. The extension rod 201 is welded to the operating handle of the control switch, so that the pressure block 202 fixed to the extension rod 201 can be close to the cabinet fixing block 102, that is, to avoid the gap between the operating handle of the control switch and the cabinet fixing block 102. When the operating handle of the control switch is closed, the pressure block 202 abuts against the connecting protrusion 1021, which can prevent the connecting strip 1011 from detaching from the connecting protrusion 1021, and also achieve the purpose of preventing the cabinet door 11 from being opened when the operating handle is not in the open state, thus preventing the user from operating with electricity and achieving a good protection effect.

[0021] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A fully enclosed medium-voltage circuit breaker cabinet, comprising a cabinet body (1), wherein a busbar-side disconnecting switch (2) is disposed at the top of the cabinet body (1), a circuit breaker (3) and a voltage transformer (4) are disposed in the middle, and a load-side disconnecting switch (5) is disposed at the bottom, wherein the busbar-side disconnecting switch (2), the circuit breaker (3) and the voltage transformer (4) are electrically connected, and the voltage transformer (4) and the load-side disconnecting switch (5) are electrically connected, characterized in that: The top of the cabinet (1) is provided with a closed outer frame (6), a left mounting plate (7) connected together, and a right support frame (8). The closed outer frame (6) is for the left mounting plate (7) and the busbar side disconnect switch (2) to be placed inside, and is connected to the left mounting plate (7) and the right support frame (8). The left mounting plate (7) is inclined and used to install the busbar side disconnect switch (2), and at the same time has a through-hole (9) that allows the connecting wires that are electrically connected to the circuit breaker (3) and the busbar side disconnect switch (2) to pass through.

2. The fully enclosed medium-voltage circuit breaker cabinet according to claim 1, characterized in that: The closed outer frame (6) is tilted outward at the end away from the right support frame (8).

3. The fully enclosed medium-voltage circuit breaker cabinet according to claim 2, characterized in that: The left mounting plate (7) is configured as a plate-shaped component, which is bent to form a first closed outer frame abutment part (71), a busbar side disconnect switch mounting part (72), and a closed outer frame connecting part (73). The first closed outer frame abutment part (71) abuts against the closed outer frame (6), and the closed outer frame connecting part (73) connects to the closed outer frame (6) to maintain the inclined state of the busbar side disconnect switch mounting part (72) and simultaneously obtain the through opening (9). The busbar side disconnect switch mounting part (72) is used to install the busbar side disconnect switch (2).

4. The fully enclosed medium-voltage circuit breaker cabinet according to claim 3, characterized in that: The right support frame (8) is configured as a plate-shaped component, which is bent to form a second closed outer frame abutment part (81) and a cabinet connecting part (82). The second closed outer frame abutment part (81) abuts against the closed outer frame (6), and the cabinet connecting part (82) is connected to the cabinet (1).

5. The fully enclosed medium-voltage circuit breaker cabinet according to claim 1, characterized in that: The cabinet (1) is provided with two cabinet doors (11) distributed at the top and bottom. The operating switches of the bus-side disconnect switch (2) and the load-side disconnect switch (5) are both located on the cabinet panel of the cabinet (1) where the cabinet doors (11) are located, and are also distributed symmetrically at the top and bottom. A protection mechanism (10) is provided between the cabinet door (11) and the corresponding operating switch so that the cabinet door (11) cannot be opened when the operating switches of the two disconnect switches are not opened.

6. The fully enclosed medium-voltage circuit breaker cabinet according to claim 5, characterized in that: The protection mechanism (10) includes a cabinet door fixing block (101) with a connecting strip (1011) and a cabinet body fixing block (102) that is inserted into the connecting strip (1011). A connecting protrusion (1021) is formed on the cabinet body fixing block (102). A socket (10111) for inserting into the connecting protrusion (1021) is provided on the connecting strip (10111). A pressing part (20) is provided on the operating handle of the operating switch to press on the connecting strip (1011) and prevent the connecting strip (1011) from disengaging from the connecting protrusion (1021).

7. The fully enclosed medium-voltage circuit breaker cabinet according to claim 6, characterized in that: The pressing part (20) includes an extension rod (201) and a pressing block (202). The extension rod (201) is fixed on the operating handle of the control switch, and the pressing block (202) is fixed on the end of the extension rod (201) that is not fixed on the operating handle of the control switch.

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