Vehicle-mounted semi-closed combined electric appliance

Abstract

A vehicle-mounted semi-closed combined electric appliance belongs to the technical field of electric power high-voltage equipment and comprises an underframe and a circuit breaker, the underframe is fixedly mounted on a vehicle chassis, the circuit breaker is horizontally mounted on the underframe, a movable side of the circuit breaker is connected with a current transformer and a spring operating mechanism, the current transformer is located above the circuit breaker, and the spring operating mechanism is connected with the spring operating mechanism. The current transformer is connected with a horizontal angle type isolation grounding combination switch and a three-way sleeve through a four-way sleeve, the top of the three-way sleeve is connected with a first outgoing line sleeve which is vertically / obliquely arranged, the static side of the circuit breaker is vertically connected with a linear isolation switch, the top of the linear isolation switch is connected with a second outgoing line sleeve which is vertically / obliquely arranged, and the static side of the circuit breaker is vertically connected with a third outgoing line sleeve. The circuit breaker is directly and fixedly arranged on the bottom frame, and the horizontal angle type isolation grounding combination switch is arranged above the circuit breaker, so that the length and the height are reduced, the whole equipment is more compact, the gravity center of the equipment is lowered, and the horizontal angle type isolation grounding combination switch is suitable for occasions with harsh environments such as rescue and relief work.

Description

Technical Field

[0001] The invention relates to the technical field of electric high voltage equipment, in particular to a vehicle-mounted semi-enclosed combined electrical appliance. Background Art

[0002] A combination appliance is a device that combines two or more electrical appliances into a whole according to wiring requirements while each appliance still maintains its original performance. It can be divided into low-voltage combination appliances and high-voltage combination appliances according to the voltage level.

[0003] At present, there are mainly two types of combined electrical appliances: AIS equipment and GIS equipment. Among them, 126kV AIS open switchgear mainly includes independent components exposed to the air such as circuit breakers, disconnectors, grounding switches, voltage transformers, current transformers, lightning arresters, etc., which occupy a large area, have a large maintenance workload, a long construction period, and low reliability. 126kV GIS fully enclosed combined electrical appliances seal all the above components in a grounded metal shell and fill it with sulfur hexafluoride gas (SF6) at a certain pressure as arc extinguishing and insulating medium. Compared with AIS equipment, it occupies a small area and has high reliability.

[0004] Although the existing GIS equipment line transformer group structure is compact, its overall structural type is a vertical common box layout of the circuit breaker, and the electrical units are respectively arranged on the left and right sides of the circuit breaker. The line transformer group interval length is large and is not suitable for vehicle-mounted operation. It is restricted to a fixed area and cannot be quickly migrated. The layout flexibility is poor. When the power system is damaged by natural disasters and accidents, the system operation cannot be quickly restored, and it cannot provide power support for new construction sites and large-scale event venues. Summary of the invention In order to solve the technical problems in the above background technology that the existing combined electrical appliances occupy a large area, are not suitable for vehicle-mounted operation, are restricted by fixed areas, cannot be quickly moved, and have poor layout flexibility, the present invention provides a vehicle-mounted semi-enclosed combined electrical appliance.

[0005] The technical solution of the present invention is as follows: The present invention provides a vehicle-mounted semi-enclosed combination electrical appliance, comprising a chassis and a circuit breaker. The circuit breaker is a three-phase circuit breaker. The chassis is fixedly mounted on the chassis of the vehicle, which facilitates the mobile transportation of the entire combination electrical appliance, so that it can quickly arrive at the required work site. Whether it is a temporary repair or an emergency power supply scene, it can be quickly put into use, which greatly improves the mobility and flexibility of the equipment and reduces the power outage time caused by the delay in the equipment being in place. The interior of the chassis is a channel for cable arrangement, so that the cable wiring is regular and orderly, avoiding the safety hazards caused by the disorderly cables, such as leakage, short circuit, etc., and also improves the space utilization rate, making the entire device more compact. The circuit breaker is horizontally mounted on the chassis, and the moving side of the circuit breaker is connected with Current transformer and spring operating mechanism, the current transformer is located above the circuit breaker, the current transformer is connected to the horizontal angle isolating and grounding combination switch and the three-way bushing through the four-way bushing, the top of the three-way bushing is connected to the vertical / inclined first outlet bushing, the static side of the circuit breaker is vertically connected to the linear isolating switch, the top of the linear isolating switch is connected to the vertical / inclined second outlet bushing, the circuit breaker is directly fixed on the base frame, and the horizontal angle isolating and grounding combination switch is installed above the circuit breaker, which reduces the length and height dimensions, makes the overall equipment more compact and small in size, and lowers the center of gravity of the equipment, which is suitable for use in harsh environments such as emergency rescue and disaster relief, and does not need to be disassembled during transfer and transportation.

[0006] Preferably, the horizontal angle-type isolating and grounding combination switch includes a grounding switch and an angle-type isolating switch. The grounding break of the grounding switch is perpendicular to the isolating break of the angle-type isolating switch. The height of the grounding switch is higher than that of the angle-type isolating switch, which can effectively avoid electrical accidents that may be caused by misoperation. When the grounding operation is performed, due to the vertical break, the risk of misclosing the angle-type isolating switch is greatly reduced, thereby improving operational safety. At the same time, this layout makes the electric field distribution more reasonable, reduces local electric field concentration, and is conducive to extending the service life of the equipment.

[0007] Preferably, the electric operating mechanisms of the angle-type isolating switch and the earthing switch are installed on the side phases, which can make the operation and control of the side phases more centralized and convenient, reduce the wiring length, reduce the complexity of the control line, and facilitate efficient operation in the limited space of the vehicle. It is also convenient for maintenance and debugging of the electric operating mechanism. The mechanical interlocking between the angle-type isolating switch and the earthing switch prevents dangerous situations such as operating the isolating switch under load or mistakenly closing the earthing switch, thereby ensuring the safety of equipment and operators.

[0008] Preferably, the first outlet bushing and the second outlet bushing on both sides of the middle phase are arranged vertically, which is conducive to connecting with external equipment in the vertical direction and reducing space occupancy. For some application scenarios with limited upper space, such as connecting the upper power supply line in a narrow compartment, the vertically arranged bushing is more adaptable and convenient for installation and docking. The first outlet bushing and the second outlet bushing on both sides of the side phase are inclined toward the side away from the middle phase, which can make the connection between the side phase and the external equipment more flexible and avoid interference with the middle phase outlet bushing and other components. Especially when the vehicle-mounted equipment needs to be frequently moved and adjusted, the inclined bushing can better adapt to different connection angle requirements and improve the reliability of the connection.

[0009] Preferably, there is an angle of 30° between the outlet bushings of the edge phase and the outlet bushings of the middle phase, which effectively ensures that the outlet bushings of the edge phase and the middle phase do not interfere with each other.

[0010] Preferably, the second outgoing line bushing of the side phase is connected to the corresponding linear isolating switch through a bent neck bushing, so that the outgoing line direction can be flexibly adjusted without changing the main structure of the linear isolating switch to adapt to the complex spatial layout requirements of the side phase, especially in a vehicle environment. The vibration and bumps of the vehicle may cause slight changes in the position of the components. The bent neck bushing can buffer the impact of such changes and ensure the stability of the electrical connection.

[0011] Preferably, the first outlet bushing and the second outlet bushing are both straight silicone rubber composite insulating bushings. Silicone rubber has excellent insulation properties, can effectively prevent electrical accidents such as leakage and flashover, meet the standard requirements of dry arc and creepage distance, and ensure the safety of equipment and personnel; and the composite insulating bushing is light in weight, resistant to dirt and has a strong mechanical structure. It can not only withstand external forces such as vibration and collision during vehicle transportation without explosion risk, but also lowers the overall center of gravity of the equipment, making it more suitable for use in harsh environments such as emergency rescue and disaster relief. At the same time, the straight design makes it easier to install and connect external lines.

[0012] Preferably, flat-plate terminal blocks are installed at the top of the first outlet bushing and the second outlet bushing, which further reduces the overall height of the equipment, increases the contact area with the external wires, reduces contact resistance, reduces problems such as heating and sparking due to poor contact, improves the reliability of the electrical connection, and also facilitates the fixation and connection of the wires.

[0013] Preferably, the spring operating mechanism is fixedly mounted on the base frame, the spring operating mechanism is connected to the middle phase arm of the circuit breaker through a connecting rod, and the middle phase arm is connected to the two side phase arms through a four-link structure, thereby realizing the synchronization of the action of the three-phase circuit breaker, ensuring that the three-phase circuit can act simultaneously when opening and closing, meeting the synchronization requirements of the three-phase circuit, avoiding problems such as power system imbalance and equipment damage caused by different phases of the three phases, and improving the stability of power transmission.

[0014] Preferably, the bottoms of all three-way sleeves are connected by a connecting frame, and the bottoms of the connecting frame are fixedly connected to the base frame by a retractable and adjustable supporting mechanism, so that the three-way sleeve forms a relatively stable overall structure, thereby enhancing its mechanical strength and reducing the risk of component deformation and damage due to external impact and vibration. At the same time, the height and horizontality of the three-way sleeve can be flexibly adjusted according to different road conditions, the inclination angle of the vehicle-mounted equipment and other factors, ensuring that the three-way sleeve is always in the best working state during the bumpy transportation process and different installation sites, thereby ensuring the stability of the electrical connection.

[0015] It can be seen from the above technical solutions that the advantages of the present invention are: 1. The circuit breaker is directly fixed on the chassis, and the horizontal angle isolating grounding combination switch is installed above the circuit breaker, which reduces the length and height dimensions, makes the overall equipment more compact and small in size, and lowers the center of gravity of the equipment, making it easy to carry it on a vehicle. The chassis is fixed on the chassis of the vehicle, which is convenient for the mobile transportation of the entire combination electrical appliance. The interior of the chassis is a channel for cable layout, which improves space utilization and makes the entire device more compact. It is suitable for use in harsh environments such as emergency rescue and disaster relief, and does not need to be disassembled during transfer and transportation.

[0016] 2. The first outlet bushing and the second outlet bushing on both sides of the middle phase are arranged vertically, which is conducive to connecting with external equipment in the vertical direction and reducing space occupancy. For some application scenarios with limited upper space, such as connecting the upper power supply line in a narrow carriage, the vertically arranged bushing is more adaptable and convenient for installation and docking. The first outlet bushing and the second outlet bushing on both sides of the side phase are inclined toward the side away from the middle phase, which can make the connection between the side phase and the external equipment more flexible and avoid interference with the middle phase outlet bushing and other components. Especially when the vehicle-mounted equipment needs to be frequently moved and adjusted, the inclined bushing can better adapt to different connection angle requirements and improve the reliability of the connection.

[0017] 3. The second outgoing line bushing of the side phase is connected to the corresponding linear isolating switch through a bent neck bushing. The outgoing line direction can be flexibly adjusted without changing the main structure of the linear isolating switch to adapt to the complex spatial layout requirements of the side phase. Especially in the vehicle environment, the vibration and bumps of the vehicle may cause slight changes in the position of the components. The bent neck bushing can buffer the impact of such changes and ensure the stability of the electrical connection.

[0018] 4. The outlet bushing is a straight silicone rubber composite insulating bushing. Silicone rubber has excellent insulation properties, which can effectively prevent electrical accidents such as leakage and flashover, meet the standard requirements of dry arc and creepage distance, and ensure the safety of equipment and personnel; and the composite insulating bushing is light in weight, resistant to dirt and has a strong mechanical structure. It can not only withstand external forces such as vibration and collision during vehicle transportation, without the risk of explosion, but also lowers the overall center of gravity of the equipment, making it more suitable for use in harsh environments such as emergency rescue and disaster relief. At the same time, the straight design makes it easier to install and connect external lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic cross-sectional structure diagram of a vehicle-mounted semi-enclosed combination electrical appliance according to one or more embodiments of the present invention; Figure 2 It is a right side structural schematic diagram of a vehicle-mounted semi-enclosed combination electrical appliance according to one or more embodiments of the present invention; Figure 3 It is a left-side structural schematic diagram of a vehicle-mounted semi-enclosed combination electrical appliance according to one or more embodiments of the present invention; Figure 4 A schematic diagram of a top view of a vehicle-mounted semi-enclosed combination electrical appliance according to one or more embodiments of the present invention; Figure 5 is a schematic structural diagram of a chassis according to one or more embodiments of the present invention; The components represented by the reference numerals in the figure are: 1. First flat terminal; 2. First outlet bushing; 3. Earthing switch; 4. Angle disconnector; 5. Three-way bushing; 6. Current transformer; 7. Support mechanism; 8. Spring operating mechanism; 9. Base frame; 10. Arc extinguishing chamber; 11. Linear disconnector; 12. Bent neck bushing; 13. Control cabinet; 14. Second outlet bushing; 15. Second flat terminal. DETAILED DESCRIPTION

[0021] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0022] In a typical embodiment of the present invention, Figure 1-Figure 5 As shown, a vehicle-mounted semi-enclosed combination electrical appliance is proposed, including: a chassis 9 and a horizontally arranged circuit breaker, the circuit breaker is fixedly mounted on the chassis 9, the chassis 9 is fixedly mounted on the chassis of a flatbed trailer, the chassis 9 is integrally welded from square tubes, the interior of the chassis 9 serves as a channel for cable arrangement, the circuit breaker has a rated current of 3150A, a rated short-circuit breaking current of 40kA, and a rated short-circuit closing current of 100kA, which can meet the needs of system control and protection.

[0023] The circuit breaker is a three-phase circuit breaker, including a middle phase (phase B) and two side phases (phase A and phase C) located at the outermost side. A spring operating mechanism 8 is provided at one end of the circuit breaker. The spring operating mechanism 8 is fixedly mounted on a base frame 9. The spring operating mechanism 8 is arranged in a T-shape at the front side of the tank body (arc extinguishing chamber 10) in the vertical direction, that is, the axial direction of the tank body is perpendicular to the spring operating mechanism 8. The spring operating mechanism 8 is connected to the middle phase arm of the circuit breaker through a connecting rod, and the middle phase arm is connected to the two side phase arms through a four-link structure. The overall transmission is flexible and uniform, the opening and closing positions are accurate and reliable, and the requirements for the three-phase synchronization of the circuit breaker can be met, that is, the consistency of the action time of the three-phase contacts of the circuit breaker.

[0024] The circuit breaker includes three arc extinguishing chambers 10 arranged horizontally side by side. The arc extinguishing chambers 10 are fixedly mounted on the base frame 9. A connection port is provided above the tank body on the moving side of each arc extinguishing chamber 10 and is connected to a current transformer 6. The current transformer 6 is equipped with a TPY transient protection coil and a measurement and metering coil to meet the requirements of conventional protection, transient protection, measurement and billing.

[0025] The moving side of the circuit breaker adopts a Z-shaped layout to save height and length space. Specifically, a current transformer 6 is installed above the moving side of the arc extinguishing chamber 10, and a horizontal angle-type isolating and grounding combination switch with a rated current of 3150A is installed above the current transformer 6. The horizontal angle-type isolating and grounding combination switch includes a grounding switch 3 and an angle-type isolating switch 4. The grounding break of the grounding switch 3 is perpendicular to the isolating break of the angle-type isolating switch 4 to maximize the use of space.

[0026] Specifically, a four-way bushing is connected above the current transformer 6, and the grounding switch 3 and the angle disconnector 4 are fixedly installed on the corresponding interfaces of the four-way bushing, wherein the height of the grounding switch 3 is higher than the angle disconnector 4, and the isolating fracture of the angle disconnector 4 is arranged horizontally, and the grounding switch 3 is coaxially arranged with the current transformer 6. A three-way bushing 5 is connected to the interface at one end of the four-way bushing away from the angle disconnector 4, so that the outlet bushing is converted into a vertical arrangement through the three-way bushing 5. In order to ensure the insulation distance between the phases, the outlet bushings of the two phases are arranged tilted to both sides in this embodiment (such as Figure 2 and Figure 3Specifically, the outlet bushings on the moving side and the static side of the middle phase are vertically arranged, and the outlet bushings on the moving side and the static side of the side phases are inclined outward. In this embodiment, there is an angle of 30° between the outlet bushings of the side phases and the outlet bushings of the middle phase.

[0027] In order to improve the overall stability, the bottoms of all three-way bushings 5 ​​on the moving side of the circuit breaker are connected by a connecting frame, and the bottom of the connecting frame is fixedly connected to the base frame 9 by a supporting mechanism 7. Specifically, the connecting frame is a channel steel structure to support all the three-way bushings 5 ​​through a single channel steel, and the supporting mechanism 7 is a vertically arranged double-headed long screw structure, which can achieve flexibility in height adjustment.

[0028] To facilitate installation and maintenance, the electric operating mechanisms of the angle disconnector 4 and the grounding switch 3 are installed side by side. The three-phase angle disconnectors 4 are connected by connecting rods and crank arms, and the grounding switches 3 are connected by connecting rods and crank arms. The angle disconnector 4 and the grounding switch 3 of the same phase are mechanically interlocked by connecting rods and crank arm structures. The grounding switch 3 can only be closed when the angle disconnector 4 is in the open state, and the angle disconnector 4 cannot be closed when the grounding switch 3 is in the closed state to prevent misoperation. The electric operating mechanism can drive the moving contacts of the angle disconnector 4 and the grounding switch 3 to perform opening and closing actions through the crank arm and the connecting rod, and the structure is simple and flexible.

[0029] The static side of the circuit breaker adopts a linear layout. Specifically, a connection port is provided above the static side of the arc extinguishing chamber 10 tank body, and a linear isolating switch 11 with a rated current of 3150A is installed on the connection port. The linear isolating switch 11 is vertically arranged to reduce the length space occupied. The outer crank arm connecting all the linear isolating switches 11 is driven by a transmission shaft to isolate the moving contacts, so that the transmission is accurate and reliable. The transmission shaft is connected to the electric mechanism to control the movement of the transmission shaft.

[0030] In this embodiment, the isolating fracture of the linear isolating switch 11 on the static side of the middle phase is vertically connected to the outlet bushing, and the two side phases are connected to the outlet bushing through the bent neck bushing 12. The bent necks of the two side phases are designed to be inclined 30° to both sides respectively. After the outlet bushing is assembled, the two side phases are also inclined 30° relative to the middle phase. While meeting the insulation distance requirements, the use of the three-way bushing 5 is cancelled on the static side, and the space in the total length direction can be minimized.

[0031] like Figure 1 and Figure 4 As shown, the moving side of the middle phase is connected to the first outlet bushing 2, the static side of the middle phase is connected to the second outlet bushing 14, and the first outlet bushing 2 and the second outlet bushing 14 on both sides of the middle phase are both arranged vertically; Figure 2 , Figure 3 and Figure 4As shown, the moving sides of the two side phases are respectively connected to a first outlet bushing 2 through a three-way bushing 5, and the three-way bushing 5 on the moving side of the side phase is inclined in the direction away from the middle phase, thereby causing the first outlet bushing 2 on the moving side of the side phase to tilt outward, and the static sides of the two side phases are respectively connected to a second outlet bushing 14 through a bent neck bushing 12, thereby causing the second outlet bushing 14 on the static side of the side phase to tilt outward.

[0032] In order to reduce the overall height of the equipment, the first outlet bushing 2 and the second outlet bushing 14 both adopt straight silicone rubber composite insulating bushings with a total length of 1220 mm, which meet the standard requirements of dry arc and creepage distance, and are about 100 mm lower than conventional porcelain bushings. In addition, the composite insulating bushings are light in weight, highly resistant to contamination, and have no explosion risk, which reduces the overall center of gravity of the equipment and is more suitable for use in harsh environments such as emergency rescue and disaster relief.

[0033] In this embodiment, the heavier arc extinguishing chamber 10 is directly fixed on the base frame 9, and the isolating switch and the earthing switch are installed above the corresponding arc extinguishing chamber 10. The overall equipment is more compact and small in size, and the center of gravity of the equipment is lowered. With the use of composite insulating bushings, while the overall height of the equipment is lowered, the center of gravity of the equipment as a whole is also lowered, which is convenient for installation and use. It is suitable for use in harsh environments such as emergency rescue and disaster relief. During transfer and transportation, it does not need to be disassembled and can be transported as a whole with gas. It can achieve on-site wiring and operation in a short time, and has excellent sealing performance, with an annual leakage rate of less than 0.1%. In addition, the circuit breaker adopts a spring operating mechanism 8, and the outlet bushing adopts a contamination-resistant composite bushing. The overall equipment has less maintenance workload and has higher reliability.

[0034] The top of the first outlet bushing 2 and the second outlet bushing 14 are both installed with flat-type terminal blocks. Specifically, the top of the first outlet bushing 2 is connected to the first flat-type terminal 1, and the top of the second outlet bushing 14 is connected to the second flat-type terminal 15. The first flat-type terminal 1 and the second flat-type terminal 15 are both integrally formed with the sealing flange, which can further reduce the height of the equipment by 200 mm. The flat-type terminal blocks are more conveniently connected to transformers, electrical appliances and other equipment on both sides through overhead hard busbars.

[0035] The arrangement of the outlet bushing, the four-way bushing, the three-way bushing 5 and the bent neck bushing 12 makes the arrangement of the conductors and cables more concealed, and effectively reduces the space occupied.

[0036] like Figure 5As shown, the base frame 9 includes a first support portion and a second support portion, the first support portion is used for installing the circuit breaker, one side of the first support portion is fixedly connected to a second support portion in the shape of a U-shaped portion, the control cabinet 13 is fixedly installed on the second support portion in the shape of a U-shaped portion, and the interior of the second support portion in the shape of a U-shaped portion is also a cable channel, so as to realize cable laying inside the entire base frame 9, without external cable ducts, thereby realizing the organic combination of the combined electrical equipment body and the control system, and saving space occupancy.

[0037] This embodiment optimizes the combined electrical appliance, reduces the length and height dimensions, and has a light weight and a low center of gravity, which meets the needs of vehicle-mounted arrangement and frequent transfer and transportation in harsh terrain. It has the characteristics of mobility, speed and flexibility, and can be put into use in a short time. After being connected to the overhead line, the disconnectors on both sides of the dynamic and static sides are closed, and the circuit breaker is closed, power transmission operation can be carried out; when the circuit breaker is opened, the disconnectors on both sides are opened, and the connection with the main line of the overhead line is released, the operation can be disconnected, and the plug-and-play function and the function of rapid transfer after use are realized, which meets temporary emergency power needs and is suitable for large-scale activities, engineering construction, emergency rescue and other occasions.

[0038] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vehicle-mounted semi-enclosed combination electrical appliance, comprising: A chassis (9) and a circuit breaker, characterized in that the circuit breaker is a three-phase circuit breaker, the chassis (9) is fixedly mounted on a vehicle chassis, the interior of the chassis (9) is a channel for arranging cables, the circuit breaker is horizontally mounted on the chassis (9), a current transformer (6) and a spring operating mechanism (8) are connected to the moving side of the circuit breaker, the current transformer (6) is located above the circuit breaker, the current transformer (6) is connected to a horizontal angle isolating grounding combination switch and a three-way bushing (5) through a four-way bushing, the top of the three-way bushing (5) is connected to a vertically / inclined first outlet bushing (2), the static side of the circuit breaker is vertically connected to a linear isolating switch (11), and the top of the linear isolating switch (11) is connected to a vertically / inclined second outlet bushing (14).

2. The vehicle-mounted semi-enclosed combination electrical appliance according to claim 1, characterized in that: The horizontal angular isolating and grounding combination switch comprises a grounding switch (3) and an angular isolating switch (4); the grounding break of the grounding switch (3) is perpendicular to the isolating break of the angular isolating switch (4); and the height of the grounding switch (3) is higher than that of the angular isolating switch (4).

3. The vehicle-mounted semi-enclosed combination electrical appliance according to claim 2, characterized in that: The electric operating mechanisms of the angle-type isolating switch (4) and the earthing switch (3) are installed side by side, and the angle-type isolating switch (4) and the earthing switch (3) are mechanically interlocked.

4. The vehicle-mounted semi-enclosed combination electrical appliance according to claim 1, characterized in that: The first outlet bushings (2) and the second outlet bushings (14) on both sides of the middle phase are both arranged vertically, and the first outlet bushings (2) and the second outlet bushings (14) on both sides of the side phases are both arranged obliquely toward a side away from the middle phase.

5. The vehicle-mounted semi-enclosed combination electrical appliance according to claim 4, characterized in that: There is an included angle of 30° between the outlet bushing of the side phase and the outlet bushing of the middle phase.

6. The vehicle-mounted semi-enclosed combination electrical appliance according to claim 4, characterized in that: The second outlet bushing (14) of the side phase is connected to the corresponding linear disconnector (11) via a bent neck bushing (12).

7. The vehicle-mounted semi-enclosed combination electrical appliance according to claim 1, characterized in that: The first outlet bushing (2) and the second outlet bushing (14) are both straight silicone rubber composite insulating bushings.

8. The vehicle-mounted semi-enclosed combination electrical appliance according to claim 1, characterized in that: The top ends of the first outlet bushing (2) and the second outlet bushing (14) are both equipped with flat-type connection terminals.

9. The vehicle-mounted semi-enclosed combination electrical appliance according to claim 1, characterized in that: The spring operating mechanism (8) is fixedly mounted on the base frame (9), the spring operating mechanism (8) is connected to the middle phase arm of the circuit breaker via a connecting rod, and the middle phase arm is connected to the two side phase arms via a four-link structure.

10. The vehicle-mounted semi-enclosed combination electrical appliance according to claim 1, characterized in that: The bottoms of all three-way sleeves (5) are connected via a connecting frame, and the bottom of the connecting frame is fixedly connected to the bottom frame (9) via a telescopically adjustable supporting mechanism (7).

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