Generator grounding protection device

Abstract

The utility model relates to the technical field of generator grounding, in particular to a generator grounding protection device which comprises a protection box, a stretching plate is arranged in the protection box, a mounting groove is formed in the top of the stretching plate, a bus plate is fixedly connected in the mounting groove, and components are arranged on the bus plate. A main CPU board, an analog quantity acquisition board, a relay output board and a power board are installed in the components respectively, a mounting hole is formed in the side face of the opening and closing door, a liquid crystal display board is fixedly connected in the mounting hole, and the liquid crystal display board is electrically connected with the bus board. The power panel converts strong current into weak current to supply power to other panels, the device is more reliable, the device can complete the functions of information monitoring, non-electric quantity protection, electric quantity protection, control, communication and the like of generator equipment, and the device has the characteristics of comprehensive functions, stable and reliable system, high measurement precision and flexibility in use.

Description

Technical Field

[0001] The utility model relates to the technical field of generator grounding, in particular to a generator grounding protection device. Background Art

[0002] The safe operation of the generator plays a decisive role in ensuring the normal operation of the power system and the quality of electric energy. At the same time, the generator itself is also a very valuable electrical equipment. The grounding of the stator and rotor of the generator will affect the normal operation of the generator. The utility model provides a generator grounding protection device, which can be used for grounding protection of small and medium-capacity units, including stator grounding and rotor one-point grounding and two-point grounding protection.

[0003] Existing technologies, such as: CN212726465U, a generator grounding protection device, uses two sets of stator grounding protection devices. The two sets of protection devices use different protection principles and can be flexibly set to alarm or trip, with complementary advantages; its protection range includes not only the entire stator winding, but also the neutral point of the generator. The sensitivity of the protection is consistent and is not affected by the grounding position. The size of the grounding resistance can be accurately measured and the protection is not affected by the operating conditions of the unit. Sensitive stator grounding protection can be provided under various operating conditions such as the generator being stationary, starting and stopping, no-load operation, and grid-connected operation.

[0004] However, the device still has certain shortcomings during use. Due to the heavy load of the generator during use, when the generator has a stator or rotor grounding fault, the device cannot promptly and accurately determine and protect the generator, thereby affecting the safe and reliable operation of the generator equipment. The device is not easy to install during use, and is not easy to maintain. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a generator grounding protection device, and its technical solution is:

[0006] It comprises a protection box, wherein a stretch plate is arranged in the protection box, a mounting groove is opened on the top of the stretch plate, a bus board is fixedly connected in the mounting groove, components are arranged on the top of the bus board, a main CPU board, an analog quantity acquisition board, a relay output board and a power supply board are respectively installed in the components, the main CPU board, the analog quantity acquisition board, the relay output board and the power supply board are respectively electrically connected to the bus board, an opening and closing door is rotatably connected to the side of the protection box through a hinge, a mounting hole is opened on the side of the opening and closing door, a liquid crystal display panel is fixedly connected in the mounting hole, and the liquid crystal display panel is electrically connected to the bus board.

[0007] Furthermore, a connecting plate is fixedly connected to the inner wall of the protective box, a sliding groove is opened on the side of the connecting plate, a sliding plate is fixedly connected to the side of the extension plate, the sliding plate is opposite to the sliding groove, and the sliding plate extends into the sliding groove and is slidably connected to the sliding groove.

[0008] Furthermore, a ventilation hole is provided on the side of the protection box, and a filter is fixedly connected in the ventilation hole.

[0009] Furthermore, a rectangular block is fixedly connected to the bottom of the stretch plate, and the rectangular block is made of solid wood.

[0010] Furthermore, the analog quantity acquisition board model is a domestically produced 16-bit high-precision AD chip with an AC sampling function, and the relay output board has 17 passive independent relay outputs.

[0011] Furthermore, two supporting bases are fixedly connected to the bottom of the protective box, and the material of the two supporting bases is hard rubber.

[0012] Furthermore, a door handle is fixedly connected to the side of the opening and closing door, and the material of the door handle is the same as that of the rectangular block.

[0013] Furthermore, a fixing rod is inserted into the top of the connecting plate, and a plurality of heat dissipation holes are formed on the outer surface of the stretch plate.

[0014] The beneficial effects of the utility model are as follows: by setting up the coordinated use of the main CPU board, the analog quantity acquisition board, the relay output board and the power supply board, the main CPU board judges through the logic algorithm that when the generator has a single-point grounding or two-point grounding fault in the stator or rotor, the device can quickly act to warn, the analog quantity acquisition board can be equipped with current and voltage transformers of different ranges and ratios to meet the needs of AC current and voltage acquisition in different occasions, the relay output board has 17 passive independent relay outlets for accident or alarm signal output, etc., the power supply board converts strong electricity into weak electricity to power other boards, which is more reliable, the device can complete the functions of information monitoring, non-electrical quantity protection, electrical quantity protection, control and communication of the generator equipment, and the device has the characteristics of comprehensive functions, stable and reliable system, high measurement accuracy and flexible use. By setting up a protective box, a pull-out plate, a sliding plate and a filter for use together, the main CPU board, analog acquisition board, relay output board and power board are installed in the components and fixed together with the bus board on the top of the pull-out plate. The staff can then pull the pull-out plate to install and repair the components, thereby improving construction efficiency. The filter facilitates ventilation inside the protective box and improves heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of the protection box of the utility model;

[0017] Figure 3 This is a schematic diagram of the explosion structure of the top of the stretch plate of the utility model;

[0018] Figure 4 It is a schematic diagram of the system principle structure of the utility model.

[0019] As shown in the figure: 1. Protective box; 2. Opening and closing door; 3. LCD display panel; 4. Mounting hole; 5. Door handle; 6. Ventilation hole; 7. Filter; 8. Support base; 9. Extension plate; 10. Components; 11. Main CPU board; 12. Analog acquisition board; 13. Relay output board; 14. Power board; 15. Sliding board; 16. Connecting board; 17. Sliding slot; 18. Bus board; 19. Rectangular block; 20. Mounting slot; 21. Heat dissipation hole; 22. Fixing rod. Implementation

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0021] For examples, see Figure 1-4 , the utility model provides a technical solution:

[0022] A generator grounding protection device, in this embodiment, Figure 1 , Figure 3 and Figure 4 As shown, it includes a protective box 1, a stretch plate 9 is arranged in the protective box 1, a mounting groove 20 is opened on the top of the stretch plate 9, a bus board 18 is fixedly connected in the mounting groove 20, a component 10 is arranged on the top of the bus board 18, a main CPU board 11, an analog acquisition board 12, a relay output board 13 and a power board 14 are respectively installed in the component 10, the main CPU board 11, the analog acquisition board 12, the relay output board 13 and the power board 14 are respectively electrically connected to the bus board 18, an opening and closing door 2 is rotatably connected to the side of the protective box 1 through a hinge, a mounting hole 4 is opened on the side of the opening and closing door 2, a liquid crystal display panel 3 is fixedly connected in the mounting hole 4, and the liquid crystal display panel 3 is electrically connected to the bus board 18, the model of the analog acquisition board 12 is a domestically produced 16-bit high-precision AD chip with an AC sampling function, and the relay output board 13 has 17 passive independent relay outlets.

[0023] Among them, the power board 14 converts strong electricity into weak electricity to power other boards, which is more reliable. The device can complete the functions of information monitoring, non-electrical quantity protection, electrical quantity protection, control and communication of generator equipment. The device has the characteristics of comprehensive functions, stable and reliable system, high measurement accuracy and flexible use.

[0024] In this embodiment, Figure 1 , Figure 2 and Figure 3 As shown, a connecting plate 16 is fixedly connected to the inner surface wall of the protective box 1, a sliding groove 17 is provided on the side of the connecting plate 16, a sliding plate 15 is fixedly connected to the side of the stretch plate 9, the sliding plate 15 is opposite to the sliding groove 17, the sliding plate 15 extends into the sliding groove 17 and is slidably connected to the sliding groove 17, a ventilation hole 6 is provided on the side of the protective box 1, a filter screen 7 is fixedly connected in the ventilation hole 6, a rectangular block 19 is fixedly connected to the bottom of the stretch plate 9, the rectangular block 19 is made of solid wood, two supporting bases 8 are fixedly connected to the bottom of the protective box 1, the two supporting bases 8 are made of hard rubber, a door handle 5 is fixedly connected to the side of the opening and closing door 2, the material of the door handle 5 is the same as that of the rectangular block 19, a fixing rod 22 is inserted on the top of the connecting plate 16, and a plurality of heat dissipation holes 21 are provided on the outer surface of the stretch plate 9.

[0025] Among them, the filter net 7 facilitates ventilation inside the protective box 1, thereby improving the heat dissipation efficiency. When the staff is performing maintenance, they open the opening and closing door 2, pull out the extension plate 9, and install and repair the components 10, thereby improving the construction efficiency.

[0026] The working process of the utility model: when the generator grounding protection device designed by the present invention is working, first check whether the device is used normally, install the main CPU board 11, the analog quantity acquisition board 12, the relay output board 13 and the power supply board 14 in the component 10, and then install the bus board 18 in the installation slot 20. At the same time, install the component 10 on the top of the bus board 18, and install the LCD screen 3 in the installation hole 4, so that the staff can operate the internal components conveniently. When the grounding protection device is working, the main CPU board 11 judges through the logic algorithm that when the generator has a stator or rotor one-point grounding or two-point grounding fault, the device can quickly act to warn, and the analog quantity acquisition board 12 can be equipped with different ranges and The current and voltage transformers with high transformation ratio can meet the needs of AC current and voltage collection in different occasions. The relay output board 13 has 17 passive independent relay outputs for accident or alarm signal output, etc. The power supply board 14 converts strong electricity into weak electricity to power other boards, which is more reliable. The device can complete the information monitoring, non-electrical quantity protection, electrical quantity protection, control and communication functions of the generator equipment. The device has the characteristics of comprehensive functions, stable and reliable system, high measurement accuracy and flexible use. The filter net 7 is used to facilitate ventilation inside the protective box 1, which improves the heat dissipation efficiency. When the staff is performing maintenance, they open the opening and closing door 2, pull out the extension plate 9, install and repair the components 10, and improve the construction efficiency.

[0027] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A generator grounding protection device, comprising a protection box (1), characterized in that: The protective box (1) is provided with a stretch plate (9), the top of which is provided with a mounting groove (20), a bus board (18) is fixedly connected inside the mounting groove (20), a component (10) is provided on the top of the bus board (18), a main CPU board (11), an analog quantity acquisition board (12), a relay output board (13) and a power supply board (14) are respectively installed inside the component (10), the main CPU board (11), the analog quantity acquisition board (12), the relay output board (13) and the power supply board (14) are respectively electrically connected to the bus board (18), and an opening and closing door (2) is rotatably connected to the side of the protective box (1) through a hinge, the side of the opening and closing door (2) is provided with a mounting hole (4), a liquid crystal display panel (3) is fixedly connected inside the mounting hole (4), and the liquid crystal display panel (3) is electrically connected to the bus board (18).

2. A generator grounding protection device according to claim 1, characterized in that: A connecting plate (16) is fixedly connected to the inner surface wall of the protection box (1), a sliding groove (17) is provided on the side of the connecting plate (16), a sliding plate (15) is fixedly connected to the side of the stretch plate (9), the sliding plate (15) and the sliding groove (17) are opposite to each other, and the sliding plate (15) extends into the sliding groove (17) and is slidably connected to the sliding groove (17).

3. A generator grounding protection device according to claim 1, characterized in that: A ventilation hole (6) is provided on the side of the protection box (1), and a filter screen (7) is fixedly connected inside the ventilation hole (6).

4. A generator grounding protection device according to claim 1, characterized in that: A rectangular block (19) is fixedly connected to the bottom of the stretch plate (9), and the rectangular block (19) is made of solid wood.

5. A generator grounding protection device according to claim 1, characterized in that: The model of the analog quantity acquisition board (12) is a domestically produced 16-bit high-precision AD chip with an AC sampling function, and the relay output board (13) has 17 passive independent relay outputs.

6. A generator grounding protection device according to claim 1, characterized in that: The bottom of the protection box (1) is fixedly connected to two support bases (8), and the material of the two support bases (8) is hard rubber.

7. A generator grounding protection device according to claim 1, characterized in that: A door handle (5) is fixedly connected to the side of the opening and closing door (2), and the material of the door handle (5) is the same as that of the rectangular block (19).

8. A generator grounding protection device according to claim 2, characterized in that: A fixing rod (22) is inserted into the top of the connecting plate (16), and a plurality of heat dissipation holes (21) are formed on the outer surface of the stretch plate (9).

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