Low-voltage power distribution cabinet with surge protector lightning protection drawer

Abstract

A low-voltage power distribution cabinet with a surge protector lightning protection drawer, comprising a cabinet body, the cabinet body is detachably connected with a lightning protection drawer, the lightning protection drawer is provided with a lightning protection device, and the lightning protection drawer is electrically connected in the cabinet body through plug-in insertion; the lightning protection drawer is provided with a circuit part, including a primary plug-in CJD, one end of which is electrically connected with the main bus end of the power distribution cabinet, and the other end is connected with one end of a circuit breaker QFS, the other end of the circuit breaker QFS is connected with one end of a surge protector FS, and the other end of the surge protector FS is also grounded through the primary plug-in CJD, the application has the advantages of convenient operation, maintenance and safety performance, and the like, and has the advantages of the drawer in the low-voltage drawer cabinet, and after the SPD is installed, it can prevent electric shock and fire caused by SPD failure, and prevent a series of problems such as fire spread.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of power distribution cabinet especially relates to a low voltage power distribution cabinet with lightning protection drawer of surge protector. BACKGROUND

[0002] In the vast low voltage power distribution network of our country, it often suffers from lightning, which not only endangers personal safety, but also causes great damage to electrical and electronic equipment on power supply and distribution. Our country is continuously improving the defense capability against lightning disasters. At present, the most important, cost-effective and most installed lightning protection product in low voltage distribution panel is surge protector. (Surge protector is also known as "SPD", "surge protector", "surge suppressor", "lightning protection device", etc.)

[0003] This SPD product is generally connected directly to the main bus of the low voltage distribution panel and installed in the remaining space in the low voltage cabinet. It is usually fixed directly in the secondary instrument room of the low voltage cabinet. If it is a pure drawer cabinet without instrument compartment, due to the structure and space limitation of the cabinet, it is often difficult to install SPD, or it can only be installed behind the cabinet, which leads to unreasonable installation position of SPD, and brings difficulties to observation / maintenance / repair of SPD. Moreover, it has certain electric shock or fire safety hazards during maintenance and replacement. SUMMARY

[0004] To solve the above problems, the technical scheme provides a low voltage power distribution cabinet with lightning protection drawer of surge protector.

[0005] To achieve the above purpose, the technical scheme is as follows:

[0006] A low voltage power distribution cabinet with lightning protection drawer of surge protector, comprising a cabinet body, the cabinet body is detachably connected with a lightning protection drawer, the lightning protection drawer is provided with a lightning protection device, and the lightning protection drawer is electrically connected in the cabinet body through plug-in.

[0007] The lightning protection drawer is provided with a circuit part, including a primary plug-in CJD, one end of which is electrically connected with the main bus end of the power distribution cabinet, and the other end is connected with one end of a circuit breaker QFS, the other end of the circuit breaker QFS is connected with one end of a surge protector FS, and the other end of the surge protector FS is also grounded through the primary plug-in CJD.

[0008] In some embodiments, the circuit part further includes one end connected with the main bus end of the power distribution cabinet and the other end connected with a circuit breaker QF2 with a mutual inductor, and the circuit of the circuit breaker QF2 uploads data to the monitoring system through an intelligent instrument.

[0009] In some embodiments, the inner side of the lightning protection drawer is provided with an incoming line side, the incoming line side is connected with the circuit breaker QFS through a cable, the circuit breaker QFS is connected with the SPD through a cable, and the SPD is connected with the primary plug through a cable.

[0010] In some embodiments, the lightning protection drawer is provided with an observation window.

[0011] In some embodiments, the lightning protection drawer is provided with an observation window.

[0012] The application has the following beneficial effects:

[0013] The application has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to make the technical problems, technical solutions and beneficial effects of the application clearer, the following will further describe the application in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and do not limit the application.

[0015] Figure 1 is a structural schematic diagram of the embodiment of the application;

[0016] Figure 2 is an electrical structure schematic diagram of the embodiment of the application Figure One .

[0017] Figure 3 is an electrical structure schematic diagram of the embodiment of the application Figure Two .

[0018] Figure 4 is an electrical structure schematic diagram of the embodiment of the application Figure Three .

[0019] Figure 5 is an electrical structure schematic diagram of the embodiment of the application Figure Four . DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects of the application clearer, the following will further describe the application in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and do not limit the application.

[0021] Please refer to Figures 1-5As shown, a low-voltage power distribution cabinet with a surge protector lightning protection drawer includes a cabinet body 1, the cabinet body 1 is detachably connected with a lightning protection drawer 2, the lightning protection drawer 2 is provided with a lightning protection device, and the lightning protection drawer 2 is electrically connected by plug-in in the cabinet body 1;

[0022] The lightning protection drawer 2 is provided with a circuit part, including a primary plug-in CJD, one end of which is electrically connected with a main bus end of the power distribution cabinet, and the other end is connected with one end of a circuit breaker QFS, the other end of the circuit breaker QFS is connected with one end of a surge protector FS, and the other end of the surge protector FS is also grounded through the primary plug-in CJD.

[0023] In order to avoid the above problems, the design scheme of the application is to use a plug-in drawer type metal plug-in frame design module for the corresponding components on the SPD circuit, install the SPD and the backup protector of the SPD into the sealed drawer module, and connect the wires according to the standard wiring method, so that the corresponding low-voltage power distribution cabinet not only has the function of preventing lightning and high-voltage surge attack, but also has better performance in operation and maintenance and separation form than the traditional scheme; the main advantages are as follows:

[0024] The plug-in drawer type structure unit not only has the related functions of the drawer in the low-voltage drawer cabinet, but also has the advantages of convenient operation and maintenance, safety and other advantages. After the SPD is installed, it can prevent electric shock and prevent fire spread and a series of problems from occurring when the SPD fails.

[0025] In the embodiment, the circuit part further includes one end connected with a main bus end of the power distribution cabinet, and the other end connected with a circuit breaker QF2 with a mutual inductor, and the circuit of the circuit breaker QF2 is connected with a monitoring system through an intelligent instrument.

[0026] In the embodiment, the inner side of the lightning protection drawer 2 is provided with an incoming line side 3, the incoming line side 3 is connected with the circuit breaker QFS through a cable, the circuit breaker QFS is connected with the SPD through a cable, and the SPD is connected with the primary plug-in through a cable.

[0027] In the embodiment, the lightning protection drawer 2 is provided with an observation window 4.

[0028] In the embodiment, the lightning protection drawer 2 is provided with an observation window 4.

[0029] In the embodiment, the lightning protection drawer 2 is provided with an observation window 4.

[0030] A ventilated partition divides the cabinet interior from top to bottom into a top busbar compartment and a front drawer compartment. The drawer compartment houses a surge protector (SPD) and a backup SPD. Since the switches installed in the drawers are small current molded case circuit breakers (160A and below), and the SPDs are small Class B or Class C surge protectors, a drawer compartment height of 200mm is sufficient to meet the installation space requirements of all SPDs. Guide rails are provided on both sides of the drawer compartment unit where the SPD is installed, allowing the drawer to move back and forth along these rails. A handle for operating the internal switches is mounted on the front drawer door. The handle can be rotated to different positions, working in conjunction with the drawer's interlocking mechanism to lock the drawer in different positions (exit, isolation, test, and working positions), thus achieving mechanical interlocking to prevent misoperation of the low-voltage cabinet. An observation window is located on the right side of the SPD drawer panel, allowing the user to view the failure status of the internal SPD panel (marked with a color-coded failure window) without removing the drawer.

[0031] The drawer containing the SPD includes a Class B or Class C surge protector, a backup SPD, a secondary fuse, indicator lights, primary and secondary moving and stationary connectors (i.e., moving and stationary connectors for conduction), and related connecting wires on the connection circuit, etc.

[0032] The cabinet layout and structure are similar to ordinary low-voltage feeder drawer cabinets, with no major adjustments: cable holes for cable entry and exit are opened at the top and bottom of the cabinet, and rubber rings are installed in the cable holes to protect the cables. A busbar sealing channel for vertical busbar installation is located at the rear of the drawer compartment. Busbar clamps are installed within the busbar sealing channel to secure the A, B, C, and N phase vertical busbars. The four-phase vertical busbars are connected to the horizontal main power supply busbar at the top of the cabinet. The vertical busbars connect to the primary connectors of each drawer, and are electrically connected to each phase of the main busbar at the top of the cabinet through the electrical connections of the primary connectors.

[0033] The electrical connection sequence inside the first drawer of this cabinet where the SPD is installed is as follows: the four-phase horizontal main busbars A, B, C, and N in the distribution panel are connected to the vertical busbar of this low-voltage cabinet. The vertical busbar passes through the primary moving plug CJD on the drawer's inlet side. The CJD is connected to the inlet side of the backup protection switch QFS of the SPD through a primary wire. After passing through the switch QFS, it goes to the outlet side and is then connected to the inlet side of the SPD with a wire. The outlet side of the SPD has only one grounding wire. The grounding wire passes through any phase on the primary moving plug CJD on the outlet side of the drawer. Then, the corresponding phase on the primary stationary plug CJD on the outlet side of the drawer is connected to the ground busbar inside the cabinet through a yellow-green grounding wire. This completes the electrical connection of the components in the main circuit inside this drawer.

[0034] The above describes the connection of the primary wiring of the SPD. In addition, the SPD has an alarm contact, which can be connected to the terminal block outside the drawer via a secondary connection cable and a secondary plug-in CJ. Externally, this signal can be collected to monitor the fault or damage of the SPD. There is a power indicator light on the drawer, and the brightness of this indicator light can be used to determine whether the main circuit switch is working properly.

[0035] For low-voltage incoming distribution cabinets with internal SPD circuits, the SPD circuits can also be made into the drawer-like structure described above.

[0036] The beneficial effects of this application are as follows:

[0037] This solution treats common electrical components in low-voltage cabinets—surge protectors and their backup protection switches—as a single circuit unit, installing it in an operable, enclosed drawer with its own compartment. This installation method completely eliminates human contact with the live parts of the SPD, ensuring greater safety during use and operation. It also meets the high-separation requirements of Form 4b. In the event of a fire caused by SPD failure or damage, this enclosed drawer compartment can prevent the fire from spreading to the entire cabinet.

[0038] The technical advantages of this solution are ease of operation; the working status of the SPD can be clearly seen through the observation window on the drawer panel; the SPD alarm contacts can communicate with the backend, enabling remote signaling; the backup protection switch of the SPD can be opened and closed via the operating handle on the drawer panel; and the relevant operations have corresponding mechanical interlocking functions to better prevent accidental operation by relevant personnel.

[0039] The technical advantages of this solution also include safe maintenance / replacement of the SPD. If both the surge protector and its backup protector are damaged, simply insert the spare SPD drawer unit into the corresponding position to completely replace the previously damaged device and drawer. If there is no spare SPD drawer, the drawer can be pulled out, the damaged device replaced, and then the repaired SPD drawer unit inserted into the corresponding position for repair. This design avoids the need for personnel to remove or install damaged SPDs while the device is electrified, or to de-energize the entire low-voltage cabinet for disassembly and repair, thus better ensuring the absolute safety of maintenance personnel.

[0040] The technical benefits of this solution also include making the entire low-voltage switchgear more aesthetically pleasing; it allows the feeders of the low-voltage distribution cabinet and the SPD circuit to use consistent drawer units, avoiding the need for the SPD circuit to be installed separately at the back of the cabinet, which would not only make wiring difficult but also affect aesthetics and safety.

[0041] The above merely provides the preferred embodiments of the present application, and is not intended to limit the scope of the present application. Any modifications, equivalent replacements, or improvements based on the principles and the basic features of the present application are intended to be within the scope of the present application.

Claims

1. A low-voltage distribution cabinet with a surge protector and lightning protection drawer, characterized in that, Includes a cabinet (1), the cabinet (1) is detachably connected to a lightning protection drawer (2), the lightning protection drawer (2) is equipped with a lightning arrester, and the lightning protection drawer (2) is electrically connected to the cabinet (1) by plugging in a plug; The lightning protection drawer (2) is equipped with a circuit section, including a primary plug-in CJD, one end of which is electrically connected to the main bus of the distribution cabinet, and the other end is connected to one end of the circuit breaker QFS. The other end of the circuit breaker QFS is connected to one end of the surge FS, and the other end of the surge FS is also grounded through the primary plug-in CJD.

2. A low-voltage distribution cabinet with surge protector and lightning protection drawer according to claim 1, characterized in that: The circuit section also includes a connection at one end to the main busbar of the distribution cabinet and at the other end to a circuit breaker QF2 with a current transformer. The circuit of the circuit breaker QF2 uploads data to the monitoring system through a smart meter.

3. A low-voltage distribution cabinet with surge protector and lightning protection drawer according to claim 2, characterized in that: The inside of the surge protector drawer (2) is provided with an incoming line side (3). The incoming line side (3) is connected to the circuit breaker QFS via a cable. The circuit breaker QFS is connected to the SPD via a cable. The SPD is connected to the primary plug via a cable.

4. A low-voltage distribution cabinet with surge protector and lightning protection drawer according to claim 1, characterized in that: The lightning protection drawer (2) is equipped with an observation window (4).

5. A low-voltage distribution cabinet with surge protector and lightning protection drawer according to claim 1, characterized in that: The lightning protection drawer (2) is equipped with an indicator light.

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