Power distribution cabinet with middle-high voltage cabinet bus chamber capable of being connected with overhead cable

Abstract

The utility model relates to a power distribution cabinet capable of connecting an overhead cable in a middle-high voltage cabinet bus chamber. The power distribution cabinet comprises a cabinet body and a top wiring frame detachably connected with the cabinet body, the top wiring frame comprises an aerial cable, a first insulator connected with the aerial cable, and a leading-out copper bar which is connected with the first insulator and penetrates through the top wiring frame; the cabinet body comprises a copper bar connected with the leading-out copper bar and a second insulator connected with the copper bar, the second insulator is connected with an upper contact box of a circuit breaker, a lower contact box of the circuit breaker is connected with a current transformer, and the current transformer is connected with a lightning arrester through a cable. By utilizing the existing feeder cabinet, under the conditions that a cabinet top wiring frame is added, the structure of the switch cabinet is improved, the local height of a cabinet body is increased and related wiring top frame accessories are added, the feeder cabinet can be used for overhead cable type wire inlet under the condition that the electrified gap and the creepage distance of a medium-high system can be met.

Description

Technical Field

[0001] The utility model relates to the field of distribution cabinets, in particular to a distribution cabinet with an overhead cable connectable to the busbar chamber of a medium-voltage and high-voltage cabinet. Background Art

[0002] The KYN61-40.5 cabinet type accounts for the vast majority of the share in the medium-voltage and high-voltage power distribution system due to its advantages such as convenient operation and maintenance, safe and reliable power supply, etc.; if this cabinet type is adopted in the substation, in the case of no incoming line cabinet or when it is necessary to cross the incoming line cabinet to directly connect the overhead high-voltage three-phase cable to the corresponding three-phase main busbars in the above-mentioned busbar chamber; this method can quickly draw power from the main busbars on the entire distribution board, or directly connect the high-voltage emergency power supply to the main busbars on the entire distribution board through the overhead cable to quickly power the entire distribution board. At present, without adding side cabinets, there is often no standard solution to meet this requirement;

[0003] In the medium-voltage and high-voltage voltage system, the voltage is relatively high, so the live working clearance and creepage distance are relatively large. If an additional side cabinet is added for overhead cable incoming line, the cabinet width of this cabinet should at least meet 800 mm to meet the live working clearance and creepage distance of the medium-voltage and high-voltage system, which not only occupies space but also increases costs. Summary of the Utility Model

[0004] To solve the above problems, this technical solution provides a distribution cabinet with an overhead cable connectable to the busbar chamber of a medium-voltage and high-voltage cabinet.

[0005] To achieve the above object, the technical solution is as follows:

[0006] A distribution cabinet with an overhead cable connectable to the busbar chamber of a medium-voltage and high-voltage cabinet, including a cabinet body and a top wiring frame detachably connected to the cabinet body;

[0007] The top wiring frame includes an overhead cable, a first insulator connected to the overhead cable, and a lead-out copper bar connected to the first insulator and passing through the top wiring frame;

[0008] The cabinet body includes a copper bar connected to the lead-out copper bar, a second insulator connected to the copper bar, the second insulator is connected to the upper contact box of the circuit breaker, a current transformer is connected to the lower contact box of the circuit breaker, and the current transformer is connected to the lightning arrester through a cable.

[0009] In some embodiments, the top wiring frame is provided with angle steel for fixing the first insulator.

[0010] In some embodiments, an insulating board is provided between the cabinet body and the top wiring frame, and the top wiring frame is provided with a plurality of fixing bolts connected to the cabinet body.

[0011] In some embodiments, a top cover plate that can be opened by a hinge is provided on the top of the top wiring frame.

[0012] In some embodiments, a door body that can be opened by a hinge is provided on the end face of the top wiring frame.

[0013] The beneficial effects of this application are as follows:

[0014] Without adding side cabinets, this application utilizes the existing feeder cabinet. By adding a cabinet top wiring frame and improving the structure of the switch cabinet, increasing the local height of the cabinet body and adding relevant wiring top frame accessories, it can meet the live working clearance and creepage distance requirements of medium and high voltage systems, and at the same time, the feeder cabinet can be used for overhead cable inlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below.

[0016] Figure 1 It is a schematic structure of an embodiment of the present invention Figure 1 ;

[0017] Figure 2 It is a schematic structure of an embodiment of the present invention Figure 2 . DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] Please refer to Figure 1-2 As shown, a power distribution cabinet with a medium and high voltage cabinet bus chamber that can be connected to an overhead cable includes a cabinet body and a top wiring frame 1 detachably connected to the cabinet body;

[0020] The top wiring frame 1 includes an overhead cable 2, a first insulator 3 connected to the overhead cable 2, and a lead-out copper bar 4 connected to the first insulator 3 and passing through the top wiring frame 1;

[0021] The cabinet body includes a copper bar connected to the lead-out copper bar 4, and a second insulator 5 connected to the copper bar. The second insulator 5 is connected to the upper contact box of the circuit breaker 6. The lower contact box of the circuit breaker 6 is connected to a current transformer 7, and the current transformer 7 is connected to a lightning arrester 8 through a cable.

[0022] In this embodiment, the top wiring frame 1 is provided with an angle steel 9 for fixing the first insulator 3.

[0023] In this embodiment, an insulating plate 10 is provided between the cabinet body and the top wiring frame 1, and the top wiring frame 1 is provided with a plurality of fixing bolts 11 connected to the cabinet body.

[0024] In this embodiment, a top cover plate 12 that can be opened by a hinge is provided on the top of the top wiring frame 1.

[0025] In this embodiment, a door body 13 that can be opened by a hinge is provided on the end face of the top wiring frame 1.

[0026] Specifically, the principle of this application is as follows:

[0027] The KYN61 cabinet is made of 2.0 mm thick aluminized zinc steel plate and stainless steel plate and is assembled into a medium and high voltage AC metal enclosed structure cabinet with an overall external dimension of: depth, 2800 mm, width, 1400 mm, height, 2650 mm. Inside the cabinet, the cabinet is divided into the following 5 compartment parts by metal partitions: secondary control relay protection room, busbar room, cable room, handcart room and small busbar room;

[0028] For the standard KYN61 cabinet type, the busbar room of the cabinet body is flush with the cabinet body with a height of 2650 mm and is sealed with a metal cover plate. This busbar room is mainly used for the connection of the horizontal main busbars between cabinets. The three-phase horizontal main busbars run across the entire distribution board. All feeder cabinets take power from this three-phase horizontal main busbar through branch buses, and the supply current flows from the horizontal main busbar into the branch bus to the upper contact of the circuit breaker, through the circuit breaker, to the lower contact of the circuit breaker, into the input end of the current transformer, through the current transformer to the output end, and finally reaches the feeder copper busbar in the cable room. The load is connected to this feeder copper busbar with a cable, and then the high-voltage electricity in the distribution board can be sent to the load end to complete the power distribution;

[0029] It is necessary to transform the busbar room of the above-mentioned feeder cabinet to realize the direct connection of the overhead medium and high voltage three-phase cables to the corresponding three-phase main busbars in the busbar room of the feeder cabinet; in this way, power can be quickly taken from the main busbar in the entire distribution board, or the medium and high voltage emergency power supply can be directly connected to the main busbar in the entire distribution board through the overhead cable to realize power transmission;

[0030] The busbar chamber of the standard KYN61 cabinet type is a separately sealed compartment. The three-phase main busbars are arranged in a triangular pyramid shape in the cabinet. Phase C is at the lower end, and phases A and B are at the upper end of phase C. Phase B is closer to the front of the cabinet. Phase A is at the upper end of phase C, and the horizontal main busbars of phases A and C are arranged on the same vertical plane. The horizontal distance between the centers of phases A, B, and C is 300 mm, just meeting the minimum live working distance required by the national standard. Since the space in the busbar chamber is limited, it is impossible to directly pull the cable into the busbar chamber and connect it to the corresponding busbar. If such an operation is carried out, first, it violates industry standards; second, there is no space in the busbar chamber for wiring operations; third, the cables of different phases in the busbar chamber are very likely to cross, and the cables cannot be fixed, which is extremely likely to cause a high-voltage two-phase short circuit and lead to major casualties. Therefore, it is necessary to use copper bars to lead the three-phase main busbars outside the cabinet and then carry out necessary protection and connection outside the cabinet.

[0031] The depth of the standard KYN61 cabinet is 2800 mm, and the busbar chamber is located in the upper-middle part of the cabinet body, accounting for about 1000 mm in the depth direction of the cabinet body. In this design, a wiring frame with a height of 840 mm is added to the busbar chamber separately on the top of the cabinet. Due to the connection process of medium and high-voltage cables, relevant accessories need to be made for the cable heads. Therefore, at least 750 mm of space should be reserved from the fixed cable position to the connection point. Considering the live working clearance and creepage distance of the medium and high-voltage system comprehensively, the top frame of the wiring part with a height increase of 840 mm is finally made into a trapezoidal sealed structure.

[0032] This trapezoidal structure wiring top frame with a height of 840 mm is assembled with angle steel to form the skeleton of the busbar chamber top frame, and then assembled with a top cover plate, front door plate, rear sealing plate, high-voltage insulator, insulating cable clamp, and mounting bracket made of thick aluminized zinc steel plate bent to form a wiring top frame with a width of 1580 * depth of 1250 * height of 840 mm. The bottom of this top frame needs to be connected to the copper bar in the busbar chamber with a 50 * 10 vertical copper bar to lead the electricity to this wiring chamber of the top frame and connect it to the overhead cable outside. This lead-out copper bar needs to be reversed in phase sequence and then fixed together with the insulator in this wiring chamber. The insulator with a height of 320 mm is fixed on the top mounting beam. The mounting beam is welded to the skeleton with angle steel. The cable is introduced from the back of this chamber and connected to the copper bar fixed by three insulators. Therefore, a cable round hole with a diameter of 180 mm is opened on the rear sealing plate of the wiring chamber, and the cable hole is blocked with a tower-shaped sealing ring, and a cross beam is installed to fix the busbar clamp on the cross beam for fixing the high-voltage cable.

[0033] This newly added wiring chamber needs to be isolated from the busbar chamber of the cabinet body. However, since three-phase copper bars are led out from the top, insulation needs to be considered. Therefore, the bottom is sealed with a 10-mm-thick insulating partition with three-phase copper bar holes. Considering that the lead-out busbars in the wiring chamber need to be connected to and maintained with the cables, the front sealing plate of the top frame is designed as a door structure with a hinge on one side and a door lock on the other side and can be opened. The top cover plate has a hinge at the back and a door lock at the front and can be opened upward.

[0034] Four angle steel skeletons at the bottom of the wiring top frame of the cabinet body are each provided with bolt holes, and the size, quantity and position of these holes are consistent with those of the openings at the top of the busbar chamber of the cabinet body; after the wiring top frame is aligned with the busbar chamber of the cabinet body, these holes pass through standard M8 bolts for connection and fastening, and then the top frame and the cabinet body can be fixed; conversely, separation can also be achieved; this detachable structure is convenient for processing, installation and transportation.

[0035] This solution adds a detachable wiring top frame to the busbar chamber of the standard KYN61-40.5 feeder cabinet. Through simple transformation, it has the following effects and advantages:

[0036] 1. Generally, it is necessary to meet the requirement of directly connecting the overhead medium and high voltage three-phase cables to the corresponding three-phase main busbars in the above-mentioned busbar chamber. It is necessary to add a wiring cabinet with a width of 800mm to meet the requirements of live working clearance and creepage distance; this not only wastes the floor space of the distribution room, but also increases the cost of the cabinet body; this solution can save the use of a wiring cabinet, materials and the space of the substation when meeting the requirements and standards.

[0037] 2. This solution designs the cabinet top wiring frame as a detachable top frame accessory, which enhances the interchangeability and practicability of the whole cabinet. If the user needs the function of "directly connecting the overhead medium and high voltage three-phase cables to the corresponding three-phase main busbars in the above-mentioned busbar chamber", only a wiring top frame accessory with a height of 840mm needs to be added to meet the function requirements. The lower part of the feeder cabinet is a common and standard KYN61 cabinet; it is convenient for manufacturing and processing, can reduce the design and use of non-standard size cabinets, and can greatly reduce the processing, installation and production costs.

[0038] 3. The wiring top frame is detachable, making the transportation, installation and handling of the entire KYN61-40.5 feeder cabinet more convenient. This cabinet body is transported in two parts, saving the handling and installation costs that require large lifting equipment compared with transporting it as a whole.

[0039] 4. The front door panel and top plate of the top wiring frame designed in this solution are equipped with openable and lockable doors, which not only ensure the convenience of cable wiring and maintenance, but also ensure the safety of maintenance personnel; a padlock can be installed when the high-voltage cabinet is energized, and the sealing plate is only unlocked when wiring or maintaining.

[0040] The above description is only the preferred embodiment of the present application, and is not used to limit the scope of implementation of the present application. All other principles and basic structures that are the same as or similar to those of the present application are within the protection scope of the present application.

Claims

1. A distribution cabinet with a busbar room of a medium and high voltage cabinet capable of connecting an overhead cable, characterized in that: It comprises a cabinet body and a top wiring frame (1) detachably connected to the cabinet body; The top wiring frame (1) comprises an overhead cable (2), a first insulator (3) connected to the overhead cable (2), and a lead-out copper busbar (4) connected to the first insulator (3) and passing through the top wiring frame (1); The cabinet comprises a copper busbar connected to the lead-out copper busbar (4), and a second insulator (5) connected to the copper busbar, the second insulator (5) being connected to an upper contact box of a circuit breaker (6), the lower contact box of the circuit breaker (6) being connected to a current transformer (7), and the current transformer (7) being connected to a lightning arrester (8) via a cable.

2. A distribution cabinet with a medium and high voltage cabinet busbar chamber that can be connected to overhead cables according to claim 1, characterized in that: The top wiring frame (1) is provided with an angle steel (9) for fixing the first insulator (3).

3. A power distribution cabinet with a busbar compartment for connecting overhead cables according to claim 1, characterized in that: An insulating plate (10) is provided between the cabinet and the top wiring frame (1), and the top wiring frame (1) is provided with a plurality of fixing bolts (11) connected to the cabinet.

4. A power distribution cabinet with a busbar compartment for connecting overhead cables according to claim 1, characterized in that: The top of the top wiring frame (1) is provided with a top cover plate (12) which is opened with a hinge.

5. A power distribution cabinet with a medium and high voltage cabinet busbar chamber that can be connected to overhead cables according to claim 1, characterized in that: The end surface of the top wiring frame (1) is provided with a door body (13) which is opened with a hinge.

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