Capacitive grounding system

Abstract

The utility model relates to a capacitive grounding system. Comprising a cabinet body, an upper-layer support and a lower-layer support are arranged in the middle of an inner cavity of the cabinet body, a plurality of upper-layer capacitors are installed on the upper-layer support, a plurality of lower-layer capacitors are installed on the lower-layer support, a plurality of access line bars and a plurality of outgoing line bars are installed on the upper portion of the inner cavity of the cabinet body, and wiring terminals are installed on the access line bars. A disconnecting link is installed between each group of incoming line bars and outgoing line bars, each outgoing line bar is connected with an upper layer capacitor or a lower layer capacitor through an internal cable, a bottom cross beam is installed on the lower portion of an inner cavity of the cabinet body, a plurality of grounding columns are installed on the bottom cross beam, and each upper layer capacitor and each lower layer capacitor are respectively connected with each grounding column. The bottom wall of the cabinet body is provided with a plurality of wire holes for access cables and grounding cables to pass through. According to the capacitive grounding system provided by the utility model, a systematized capacitive grounding facility is provided for protected equipment and systems, and the operation convenience and the standardization and normalization level of grounding protection operation are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of grounding equipment, and particularly relates to a capacitive grounding system. Background Art

[0002] Capacitive grounding is a type of grounding method. By connecting a capacitor, the grounding resistance is changed to achieve specific electrical objectives. The principle of capacitive grounding is reverse connection, that is, connecting the ground wire to the capacitor to form a reverse-connected capacitive ground. A capacitor has the ability to store charge, and the magnitude of its capacitance value determines its charge storage capacity. When a capacitor is connected to a circuit, it will store charge and change the circuit characteristics. The characteristics of the capacitor can be used to adjust the impedance of the grounding circuit. Generally, due to the existence of the grounding resistance, a grounding fault current will be generated. By connecting a capacitor, the grounding resistance can be reduced, the grounding fault current can be decreased, and thus the reliability of grounding can be improved. Capacitive grounding can reduce the grounding fault current and protect equipment and personnel from the harm of excessive current. When a grounding fault occurs, the capacitor will absorb part of the current, reducing the magnitude of the fault current and protecting other components in the circuit. In some special cases, the grounding potential may rise, causing abnormal operation or even damage to electrical equipment. By connecting a capacitor, part of the current can be directed to the ground wire, reducing the rise of the grounding potential. In summary, capacitive grounding is a commonly used protection mechanism at present.

[0003] Existing capacitive grounding does not constitute a systematic facility. For different protected systems, the sizes of the connected capacitors are different, so the operation complexity cannot be reduced and the standardization of grounding protection cannot be improved through a systematic grounding facility. Therefore, it is necessary to develop and design a capacitive grounding system to solve the aforementioned technical problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a capacitive grounding system, which provides a systematic capacitive grounding facility for protected equipment and systems, and improves the operation convenience, standardization and normalization levels of grounding protection operations.

[0005] The technical solution adopted by the utility model is: a capacitive grounding system, including a cabinet body. In the middle of the inner cavity of the cabinet body, there are an upper bracket and a lower bracket. A plurality of upper capacitors are installed on the upper bracket, and a plurality of lower capacitors are installed on the lower bracket. A plurality of access line rows and a plurality of outgoing line rows are installed in the upper part of the inner cavity of the cabinet body. Wiring terminals are installed on each access line row. A knife switch is installed between each group of access line rows and outgoing line rows. Each outgoing line row is connected to the upper capacitor or the lower capacitor by an internal cable. A bottom cross beam is installed in the lower part of the inner cavity of the cabinet body. A plurality of grounding posts are installed on the bottom cross beam, and each upper capacitor and each lower capacitor are respectively connected to each grounding post. A plurality of wire holes for the access cable and the grounding cable to pass through are provided on the bottom wall of the cabinet body.

[0006] Preferably, three upper capacitors are provided, three lower capacitors are provided, three groups of access busbars and outgoing busbars are provided, and three knife switches are provided.

[0007] Preferably, an inner bracket of the cabinet is installed at the upper part inside the cabinet, each access busbar and each outgoing busbar are installed on the inner bracket of the cabinet through insulators, and the terminal blocks are installed on the inner bracket of the cabinet through insulators.

[0008] Preferably, an openable rear cabinet door is installed at the lower part of the back of the cabinet, a back heat dissipation plate is installed at the upper part of the back of the cabinet, and a heat dissipation component is installed at the top of the inner cavity of the cabinet and inside the back heat dissipation plate.

[0009] Preferably, an openable top cabinet door is installed at the upper part of the front of the cabinet, an openable middle cabinet door is installed in the middle of the front, and an openable bottom cabinet door is installed at the bottom of the front. Ventilation holes are provided on the bottom cabinet door.

[0010] Preferably, a knife switch opening component is further installed on the middle cabinet door. The knife switch opening component includes a sleeve installed on the middle cabinet door and a push rod located inside the sleeve. An insulating trigger rod is installed at the inner end of the push rod, and each insulating trigger rod abuts against the knife arm of each knife switch.

[0011] The advantages and positive effects of the present utility model are:

[0012] The present utility model provides a capacitive grounding system with reasonable structural design. Compared with the existing capacitive grounding facilities, the present utility model provides a systematic grounding facility. By arranging a plurality of capacitors inside, and arranging access busbars with terminal blocks for connecting the access cables of protected equipment and systems, and arranging a plurality of grounding posts connected to each capacitor at the bottom, the connection operation of the access cables and grounding wires is made convenient. The plurality of capacitors inside have different model parameters, and different capacitors can be selectively enabled according to the current system parameter requirements during grounding protection, thus improving the standardization and normalization level of grounding protection.

[0013] The cabinet provides a protective effect on the internal capacitors and related components. By installing knife switches between each group of access busbars and outgoing busbars, each grounding protection path can be quickly disconnected as needed and the grounding connection can be quickly restored. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the front view structural schematic diagram of the present utility model;

[0015] Figure 2 is the three-dimensional structural schematic diagram of the present utility model.

[0016] In the figure:

[0017] 1. Cabinet; 2. Knife switch; 3. Internal cable; 4. Bottom crossbeam; 5. Back heat sink; 6. Terminal; 7. Access busbar; 8. Output busbar; 9. Upper capacitor; 10. Upper bracket; 11. Lower capacitor; 12. Lower bracket; 13. Earth column; 14. Bottom cabinet door; 15. Cable hole; 16. Top cabinet door; 17. Middle cabinet door. Detailed implementation mode

[0018] For further understanding of the invention content, features and effects of the present utility model, the following embodiments are given for detailed description.

[0019] Please refer to Figure 1 and Figure 2 , the capacitive grounding system of the present utility model includes a cabinet 1, the cabinet 1 is in the shape of a cuboid and is constructed by using frame profiles and panels.

[0020] An upper bracket 10 and a lower bracket 12 are arranged in the middle of the inner cavity of the cabinet 1. A plurality of upper capacitors 9 are installed on the upper bracket 10, and a plurality of lower capacitors 11 are installed on the lower bracket 12. Each upper capacitor 9 and each lower capacitor 11 are selected with different parameter models according to needs. The upper bracket 10 and the lower bracket 12 are used to stably support each upper capacitor 9 and each lower capacitor 11, and the upper bracket 10 and the lower bracket 12 are spliced by profiles and are fixedly connected to the frame profiles of the cabinet 1 at both ends.

[0021] A plurality of access busbars 7 and a plurality of output busbars 8 are installed in the upper part of the inner cavity of the cabinet 1. Terminals 6 are installed on each access busbar 7, and knife switches 2 are installed between each group of access busbars 7 and output busbars 8. Among them, the terminal 6 is used to connect the access cable of the protected device and the system. In this embodiment, an inner cabinet bracket is installed in the upper part of the cabinet 1, and each access busbar 7 and each output busbar 8 are installed on the inner cabinet bracket through insulators, and the terminal 6 is installed on the inner cabinet bracket through insulators.

[0022] The knife switch 2 arranged between the access busbar 7 and the output busbar 8 is used to control the on and off of this path. The knife switch 2 includes two knife seats, one of the knife seats is installed on the access busbar 7, the other knife seat is installed on the output busbar 8, and a knife arm is hingedly installed on one of the knife seats. The on and off is controlled by operating whether the other end of the knife arm is combined with the knife seat.

[0023] In this embodiment, as shown in the figure, there are three upper capacitors 9, three lower capacitors 11, three groups of access busbars 7 and output busbars 8, and three knife switches 2.

[0024] Each outgoing wire row 8 is connected to the upper capacitor 9 or the lower capacitor 11 by an internal cable 3. A bottom cross beam 4 is installed at the lower part of the inner cavity of the cabinet body 1. A plurality of grounding posts 13 are installed on the bottom cross beam 4, and each upper capacitor 9 and each lower capacitor 11 are respectively connected to each grounding post 13 by an internal cable 3. As shown in the figure, six grounding posts 13 are provided, corresponding to three upper capacitors 9 and three lower capacitors 11 respectively, that is, each grounding post 13 is arranged in one-to-one correspondence with the capacitor.

[0025] A plurality of wire holes 15 for allowing access cables and grounding cables to pass through are provided on the bottom wall of the cabinet body 1. When this capacitive grounding system is applied, the cables led out from the protected equipment and system, that is, the access cables, pass through the corresponding wire holes 15 and then enter the inside of the cabinet body 1, extend upward and are connected to the terminal blocks 6, and the grounding wire passes through the corresponding wire holes 15 into the inside of the cabinet body 1 and is connected to the corresponding grounding posts 13.

[0026] In this embodiment, an openable rear cabinet door is installed below the back of the cabinet body 1, and a back heat dissipation plate 5 is installed above the back of the cabinet body 1. A heat dissipation component is installed at the top of the inner cavity of the cabinet body 1 and inside the back heat dissipation plate 15. By providing an openable rear cabinet door, the convenience of operating internal components such as each knife switch 2 is improved, the internal connection of the access cables and the grounding wires is facilitated, and the internal components are also conveniently connected by the internal cable 3. For example, the outgoing wire row 8 is connected to the capacitor with selected model parameters.

[0027] In this embodiment, an openable top cabinet door 16 is installed above the front of the cabinet body 1, an openable middle cabinet door 17 is installed in the middle of the front, and an openable bottom cabinet door 14 is installed at the bottom of the front. Ventilation holes are provided on the bottom cabinet door 14. By opening the top cabinet door 16, the heat dissipation component in the top space of the inner cavity of the cabinet body 1 can be exposed. By opening the middle cabinet door 17, each access wire row 7, the outgoing wire row 8, the knife switch 2, the upper bracket 10 and its upper capacitors 9, the lower bracket 12 and its lower capacitors 11 in the middle space of the cabinet body 1 can be exposed. By opening the bottom cabinet door 14, the bottom cross beam 4 and its grounding posts 13 in the bottom space of the cabinet body 1 can be exposed. The ventilation holes provided on the bottom cabinet door 14 allow external air to enter the cabinet body 1 from the bottom, and the upward air flow takes away the heat generated by the middle components. Finally, the hot air is discharged from the heat dissipation holes on the back heat dissipation plate 5 to avoid overheating inside.

[0028] In this embodiment, a knife-switch opening assembly is further installed on the middle cabinet door 17. The knife-switch opening assembly includes a sleeve installed on the middle cabinet door 17 and a push rod located inside the sleeve. An insulating trigger rod is installed at the inner end of the push rod, and each insulating trigger rod abuts against the knife arm of each knife switch 2. When the middle cabinet door 17 is opened, the insulating trigger rod of the knife-switch opening assembly disengages from the knife arm of each knife switch 2. When the middle cabinet door 17 is closed, the insulating trigger rod of the knife-switch opening assembly contacts the knife arm of each knife switch 2. In this way, when it is necessary to disconnect each grounding path from the outside of the cabinet body 1, it is only necessary to operate the push rod of the knife-switch opening assembly from the outside, so that the push rod and the insulating trigger rod shift inward until the knife arm of each knife switch 2 is disengaged from the knife base to realize opening the switch. When operating the closing switch, it is necessary to open the rear cabinet door for on-site operation.

Claims

1. A capacitive grounding system, characterized in that: It includes a cabinet body (1). In the middle of the inner cavity of the cabinet body (1), there are an upper bracket (10) and a lower bracket (12). A plurality of upper capacitors (9) are installed on the upper bracket (10), and a plurality of lower capacitors (11) are installed on the lower bracket (12). A plurality of incoming line rows (7) and a plurality of outgoing line rows (8) are installed in the upper part of the inner cavity of the cabinet body (1). Wiring terminals (6) are installed on each incoming line row (7). A knife switch (2) is installed between each group of incoming line rows (7) and outgoing line rows (8). Each outgoing line row (8) is connected to the upper capacitor (9) or the lower capacitor (11) by an internal cable (3). A bottom cross beam (4) is installed in the lower part of the inner cavity of the cabinet body (1). A plurality of grounding posts (13) are installed on the bottom cross beam (4), and each upper capacitor (9) and each lower capacitor (11) are respectively connected to each grounding post (13). A plurality of wire holes (15) for allowing incoming cables and grounding cables to pass through are provided on the bottom wall of the cabinet body (1).

2. The capacitive grounding system according to claim 1, characterized in that: the upper layer There are three capacitors (9), three lower capacitors (11), three groups of incoming line rows (7) and outgoing line rows (8), and three knife switches (2).

3. The capacitive grounding system according to claim 2, characterized in that: at An inner cabinet bracket is installed in the upper part of the interior of the cabinet body (1). Each incoming line row (7) and each outgoing line row (8) are installed on the inner cabinet bracket through insulators, and the wiring terminals (6) are installed on the inner cabinet bracket through insulators.

4. The capacitive grounding system according to claim 3, characterized in that: in An openable rear cabinet door is installed below the back of the cabinet body (1). A back heat dissipation plate (5) is installed above the back of the cabinet body (1). A heat dissipation component is installed on the top of the inner cavity of the cabinet body (1) and inside the back heat dissipation plate (5).

5. The capacitive grounding system according to claim 4, wherein: in An openable top cabinet door (16) is installed above the front of the cabinet body (1), an openable middle cabinet door (17) is installed in the middle of the front, and an openable bottom cabinet door (14) is installed at the bottom of the front. Ventilation holes are provided on the bottom cabinet door (14).

6. The capacitive grounding system according to claim 5, characterized in that: A knife switch opening component is also installed on the middle cabinet door (17). The knife switch opening component includes a sleeve installed on the middle cabinet door (17) and a push rod located inside the sleeve. An insulating trigger rod is installed at the inner end of the push rod, and each insulating trigger rod abuts against the knife arm of each knife switch (2).

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