Direct-current high-voltage electrical box

Abstract

The utility model relates to the technical field of rail transit vehicles, and discloses a direct-current high-voltage electrical appliance box which comprises a box body, a high-voltage chamber used for installing high-voltage electrical appliance elements and a low-voltage chamber used for installing low-voltage electrical appliance elements are arranged in the box body, and a partition plate is arranged between the high-voltage chamber and the low-voltage chamber for separation. A high-speed circuit breaker is installed in the high-voltage cavity, a high-voltage circuit breaker protection cover used for isolating electric arcs is further arranged in the high-voltage cavity, and the high-voltage circuit breaker is fixedly covered with the high-voltage circuit breaker protection cover. The problems that an existing direct-current high-voltage electric box structure is large in occupied space and low in safety are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of rail transit vehicles, and particularly relates to a DC high-voltage electrical box. Background Art

[0002] The DC high-voltage electrical box includes devices such as a main disconnector for reliably disconnecting the high voltage from the current collector, a high-speed circuit breaker for main circuit fault protection, a pre-charging contactor, a pre-charging resistor, and a main contactor; using high-voltage electrical equipment as the short-circuit protection of the DC power supply network can effectively prevent the damage of vehicle equipment caused by the increase in the loop current due to the short-circuit operation of the vehicle.

[0003] When the current passing through the high-speed circuit breaker reaches a preset value, the contact fork releases electrical energy to instantaneously disconnect the circuit by the contact. At the moment of separating the contacts, the high-speed circuit breaker will generate a high voltage and excite an arc, and the arc will disappear on the corresponding structure; at the moment of disconnecting the arc, under the action of the arc current magnetic field, the arc will also spread outwards. If it contacts nearby metal parts, there will be a short-circuit risk, and the arc will also affect the insulation of the insulating parts. Therefore, the high-speed circuit breaker and the adjacent installed devices need to maintain a certain arc-spraying distance.

[0004] With the rapid development of trains, higher requirements are put forward for the safety of trains. It is necessary to configure multiple high-speed circuit breakers in the DC high-voltage electrical box. If the existing structure of the DC high-voltage electrical box is continued to be used, there will be problems of large occupied space and low safety. Content of the Utility Model

[0005] The purpose of the utility model is to provide a DC high-voltage electrical box to solve the problems of large occupied space and low safety existing in the existing structure of the DC high-voltage electrical box.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme: a DC high-voltage electrical box, including a box body. The box body includes a high-voltage chamber for installing high-voltage electrical components and a low-voltage chamber for installing low-voltage electrical components. There is a partition between the high-voltage chamber and the low-voltage chamber. A high-speed circuit breaker is installed in the high-voltage chamber, and a high-break protection cover for isolating the arc is also provided in the high-voltage chamber. The high-break protection cover is fixedly covered outside the high-speed circuit breaker.

[0007] The principle and advantages of this solution are as follows: The high-voltage electrical appliances and low-voltage electrical appliances are placed separately in two independent chambers, separated by a partition, so that the arc of the high-voltage electrical appliances cannot act on the low-voltage electrical appliances, improving the safety of the DC high-voltage electrical appliance box. Moreover, the installation spacing between the electrical appliances can be reduced, eliminating the gap for the arc spraying distance between the low-voltage and high-voltage electrical appliances. A high-breaking protection cover is set to cover the high-speed circuit breaker, so that the arc generated by the high-speed circuit breaker is controlled within the high-breaking protection cover, preventing the arc from acting on the interior of the chamber, and reducing the gap between the high-speed circuit breaker and the inner wall of the chamber while improving the safety inside the box.

[0008] As an improvement, multiple high-speed circuit breakers are arranged in sequence on the bottom surface of the high-voltage chamber, and multiple high-breaking protection covers are provided, with each high-breaking protection cover corresponding to one high-speed circuit breaker.

[0009] The beneficial effect of this improvement is that multiple high-speed circuit breakers are separated and isolated individually, avoiding the mutual interference of the arcs generated by multiple high-speed circuit breakers. At the same time, the spacing between multiple high-speed circuit breakers can also be reduced.

[0010] As an improvement, mounting seats for installing the high-breaking protection covers are provided on the bottom surface of the high-voltage chamber. There are multiple mounting seats, with each mounting seat corresponding to one high-breaking protection cover. The mounting seat includes two cushion strips. The high-speed circuit breaker is fixedly installed between the two cushion strips of one mounting seat, and both sides of the bottom of the high-breaking protection cover are fixed to the two cushion strips of one mounting seat respectively.

[0011] The beneficial effect of this improvement is that while ensuring that the high-breaking protection cover can completely cover the high-speed circuit breaker, there is a gap of the height of the cushion strip between the end points of the cushion strip at the bottom end of the high-breaking protection cover and the bottom surface of the chamber, allowing the cable of the high-speed circuit breaker to pass through here, facilitating the reasonable installation of electrical equipment.

[0012] As an improvement, the low-voltage chamber is located at the front of the box body, and the high-voltage chamber is located at the rear of the box body. Multiple doors are provided on the side plates on both sides of the box body. The low-voltage chamber and the high-voltage chamber each contain two relatively arranged doors.

[0013] The beneficial effect of this improvement is that by opening the two doors of the same chamber, workers can observe the interior of the chamber through from both sides, facilitating the installation and maintenance of each device inside the box by workers.

[0014] As an improvement, a mounting plate for installing the disconnector module is provided in the low-voltage chamber. The mounting plate is vertically fixed to the front end face of the low-voltage chamber and is perpendicular to the front end face of the low-voltage chamber. The operating surface of the disconnector module on the mounting plate faces the nearest door in the low-voltage chamber.

[0015] A pre-charge resistor module is installed in the space between the mounting plate and the other door panel in the low-voltage chamber. The pre-charge resistor module is fixedly installed on the front end face of the low-voltage chamber; a contactor module is installed in the space between the mounting plate and the rear end face of the low-voltage chamber; the gasket is parallel to the front end face of the high-voltage chamber.

[0016] The beneficial effects of this improvement are as follows: The electrical layout methods in the low-voltage chamber and the high-voltage chamber make the internal structure more compact while meeting the installation conditions of each component, and ensure that workers standing outside the door panel can access each area.

[0017] As an improvement, the upper edge of the door panel is hinged to the upper part of the box body.

[0018] The beneficial effects of this improvement are as follows: The opening of the door panels of the low-voltage chamber and the high-voltage chamber do not interfere with each other, making the operation inside the box body more flexible.

[0019] As an improvement, the box body is of an integral structure, and both the box body and the door panel are made of aluminum alloy.

[0020] The beneficial effects of this improvement are as follows: Using light metal and adopting an integral structure to manufacture the box body reduces the overall weight of the box body while ensuring its high strength.

[0021] As an improvement, the rear end face of the high-voltage chamber is the rear end plate of the box body, and a connector for leading out the control lines inside the box is provided on the rear end plate.

[0022] As an improvement, the front end face of the low-voltage chamber is the front end plate of the box body, and a waterproof connector for the cable to pass through is provided in the installation area of the pre-charge resistor module on the front end plate.

[0023] The beneficial effects of this improvement are as follows: Connecting lines with different functions at both ends of the box body shortens the required length of cable connection and standardizes the line layout. Description of the Drawings

[0024] Figure 1 It is a schematic diagram of the internal structure of the box body.

[0025] Figure 2 It is a schematic diagram of the installation structure of the high-break protection cover and the mounting seat.

[0026] Figure 3 It is a schematic diagram of the external structure of the box body.

[0027] Figure 4 It is a schematic diagram of the external structure of the box body from another perspective. Detailed Description of the Invention

[0028] The following is a further detailed description through specific embodiments:

[0029] The reference numerals in the drawings of the specification include: a box body 1, a high-voltage chamber 2, a low-voltage chamber 3, a partition plate 4, a high-speed circuit breaker 5, a high-breaking protection cover 6, a gasket strip 7, a door panel 8, a mounting plate 9, a pre-charge resistor module 10, a contactor module 11, a rear end plate 12, a connector 13, a front end plate 14, and a waterproof connector 15.

[0030] Embodiment

[0031] Basic attachment Figure 1 And attachment Figure 2 As shown, a DC high-voltage electrical box includes a box body. The box body includes a high-voltage chamber 2 for installing high-voltage electrical components and a low-voltage chamber 3 for installing low-voltage electrical components. A partition plate 4 is provided between the high-voltage chamber 2 and the low-voltage chamber 3 to separate them. Three high-speed circuit breakers 5 are installed in the high-voltage chamber 2. Three high-breaking protection covers 6 for isolating electric arcs are also provided in the high-voltage chamber 2. The high-breaking protection covers 6 are fixedly covered outside the high-speed circuit breakers 5; the high-breaking protection covers 6 correspond to the high-speed circuit breakers 5 one by one, so that each high-speed circuit breaker 5 is covered by an independent high-breaking protection cover 6.

[0032] Mounting seats for installing the high-breaking protection covers are provided on the bottom surface of the high-voltage chamber 2. There are three mounting seats, which correspond to the high-breaking protection covers 6 one by one. Each mounting seat includes two gasket strips 7. The high-speed circuit breaker 5 is bolted and fixed between the two gasket strips 7 of a mounting seat. The two sides of the bottom of the high-breaking protection cover 6 are respectively bolted and fixed to the two gasket strips 7 of a mounting seat.

[0033] As shown in the attachment Figure 3 And the attachment Figure 4 As shown, the low-voltage chamber 3 is located at the front part of the box body 1, and the high-voltage chamber 2 is located at the rear part of the box body 1. The box body 1 is provided with multiple door panels 8 on the side plates on both sides. The low-voltage chamber 3 and the high-voltage chamber 2 each contain two oppositely arranged door panels 8.

[0034] A mounting plate 9 for installing a disconnector module is provided in the low-voltage chamber 3. The mounting plate 9 is vertically fixedly welded to the front end face of the low-voltage chamber 3 and is perpendicular to the front end face of the low-voltage chamber 3. The operating surface of the disconnector module on the mounting plate 9 faces the door panel 8 in the low-voltage chamber closest to it;

[0035] A pre-charge resistor module 10 is installed in the space between the mounting plate 9 and the other door panel 8 in the low-voltage chamber 3. The pre-charge resistor module 10 is bolted and fixed to the front end face of the low-voltage chamber 3; a contactor module 11 is installed in the space between the mounting plate 9 and the rear end face of the low-voltage chamber 3; the gasket strip 7 is parallel to the front end face of the high-voltage chamber 2, and workers can operate on each cable connected to the high-speed circuit breaker 5 from the two side door panels 8 of the high-voltage chamber 2.

[0036] The upper edge of the door panel 8 is hinged to the upper part of the box body 1 by a hinge, so that the door panel 8 can be turned upwards to open. The box body 1 is of an integral structure, and both the box body 1 and the door panel 8 are made of aluminum alloy.

[0037] The rear end face of the high-pressure chamber 2 is the rear end plate 12 of the box body 1, and a connector 13 for leading the control line inside the box outwards is provided on the rear end plate 12. The front end face of the low-pressure chamber 3 is the front end plate 14 of the box body 1, and a waterproof joint 15 for the cable to pass through is provided on the front end plate 14 in the installation area of the pre-charge resistor module 10.

[0038] The above are only embodiments of the present invention. Specific technical solutions and / or common knowledge such as characteristics that are well known in the art are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. A DC high voltage electrical box, including a box body, characterized in that: The box body includes a high-voltage chamber for installing high-voltage electrical components and a low-voltage chamber for installing low-voltage electrical components. A partition is provided between the high-voltage chamber and the low-voltage chamber. A high-speed circuit breaker is installed in the high-voltage chamber. A high-break protective cover for isolating arcs is also provided in the high-voltage chamber. The high-break protective cover is fixedly covered outside the high-speed circuit breaker.

2. The DC high voltage electrical box according to claim 1, characterized in that: There are multiple high-speed circuit breakers, which are arranged in sequence on the bottom surface of the high-voltage chamber. There are multiple high-speed circuit breakers, which correspond to the high-speed circuit breakers one by one.

3. The DC high voltage electrical box according to claim 2, characterized in that: A mounting seat for mounting the high-break protection cover is provided on the bottom surface of the high-voltage chamber, and there are multiple mounting seats, which correspond to the high-break protection covers one by one. The mounting seat includes two pads, and the high-speed circuit breaker is fixedly mounted between the two pads of a mounting seat. The two sides of the bottom of the high-break protection cover are respectively fixed to the two pads of a mounting seat.

4. The DC high voltage electrical box according to claim 3, characterized in that: The low-pressure chamber is located at the front of the box body, and the high-pressure chamber is located at the rear of the box body. The box body is provided with a plurality of door panels on the side panels on both sides, and the low-pressure chamber and the high-pressure chamber each contain two door panels arranged opposite to each other.

5. The DC high voltage electrical box according to claim 4, characterized in that: The low-pressure chamber is provided with a mounting plate for mounting the isolating switch module, the mounting plate is vertically fixed to the front end surface of the low-pressure chamber and is perpendicular to the front end surface of the low-pressure chamber, and the operating surface of the isolating switch module on the mounting plate faces the door plate in the low-pressure chamber that is closest to the mounting plate; A pre-charging resistor module is installed in the space between the mounting plate and the other door panel in the low-pressure chamber, and the pre-charging resistor module is fixedly installed on the front end surface of the low-pressure chamber; a contactor module is installed in the space between the mounting plate and the rear end surface of the low-pressure chamber; the pad is parallel to the front end surface of the high-pressure chamber.

6. The DC high voltage electrical equipment box according to claim 5, characterized in that: The upper edge of the door panel is hinged to the upper side of the box body.

7. The DC high voltage electrical equipment box according to claim 6, characterized in that: The box body is an integral structure, and the box body and the door panel are both made of aluminum alloy.

8. The DC high voltage electrical equipment box according to claim 7, characterized in that: The rear end surface of the high-pressure chamber is the rear end plate of the box body, and the rear end plate is provided with a connector for leading the control line in the box body to the outside.

9. The DC high voltage electrical equipment box according to claim 8, characterized in that: The front end surface of the low-pressure chamber is the front end plate of the box body, and the front end plate is provided with a waterproof connector for the cable to pass through in the pre-charging resistor module installation area.

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