Transformer neutral point grounding resistor cabinet

Abstract

The utility model discloses a transformer neutral point grounding resistor cabinet which comprises a resistor cabinet body, an air inlet box and supporting legs, rectangular grooves are formed in the left end and the right end of the resistor cabinet body, mounting plates are mounted at the inner ends of the rectangular grooves, sealing rings are fixedly mounted on the outer surfaces of the mounting plates, and the sealing rings are tightly attached to the inner end of the resistor cabinet body; the air inlet box is fixedly mounted at the inner end of the resistor cabinet body, a slope is arranged at the lower end of the air inlet box, and a dustproof net is fixedly mounted at the upper end of the air inlet box; the transformer neutral point grounding resistor cabinet can be used independently, can also be assembled side by side to be used in multiple groups, is suitable for installation of equipment of different sizes, the air inlet box can completely prevent rainwater from entering the resistor cabinet body, and the transformer neutral point grounding resistor cabinet is convenient to use. And if the rainfall is large, splashed rainwater can flow out of the slope, and the supporting height can be adjusted conveniently.

Description

Technical Field

[0001] The utility model relates to the field of resistance cabinets, in particular to a transformer neutral point grounding resistance cabinet. Background Art

[0002] The neutral point grounding method involves the safety, reliability and economy of the power grid; at the same time, it directly affects the selection of the insulation level of the system equipment, the overvoltage level and the relay protection method, communication interference, etc. Generally speaking, the neutral point grounding method of the power grid is the neutral point grounding method of each voltage level of the transformer in the substation, the resistor cabinet, and the high-resistance grounding of the neutral point of the generator to limit the grounding current and prevent various overvoltage hazards. The neutral point grounding through a resistor can limit the fault current to an appropriate value, improve the sensitivity of the relay protection to trip, and at the same time, only local slight burns may occur at the fault point, and the transient overvoltage is limited to 2.6 times the normal line voltage to the neutral point voltage, which limits the reignition of the arc and prevents the arc gap overvoltage from damaging the main equipment. At the same time, it can effectively prevent ferromagnetic resonance overvoltage, thereby ensuring the safe operation of the generator.

[0003] For example, a transformer neutral point grounding resistor cabinet disclosed in the utility model with authorization announcement number CN210608517U has a simple structure, is easy to use, has high heat dissipation efficiency, effectively prevents moisture inside the cabinet, and increases the service life of electrical appliances inside the cabinet.

[0004] This prior art also has the following problems when used:

[0005] The size of the resistor cabinet is fixed, and it is not convenient to adjust the capacity of the resistor cabinet according to the size of the internal structure. Moreover, for the resistor cabinet used outdoors, if the rainfall is heavy, some of the splashing rainwater can easily enter the interior of the cabinet through the gaps in the blinds, causing internal moisture. Therefore, we propose a transformer neutral point grounding resistor cabinet to solve the above problems. Utility Model Content

[0006] In order to overcome the deficiencies of the prior art, the utility model provides a transformer neutral point grounding resistor cabinet, which can solve the technical problem that the existing transformer neutral point grounding resistor cabinet proposed in the above background technology is fixed in size and it is not convenient to adjust the capacity of the resistor cabinet according to the size of the internal structure. Moreover, for the resistor cabinet used outdoors, if the rainfall is heavy, some of the splashing rainwater is easy to enter the interior of the cabinet through the gaps in the blinds, causing internal moisture.

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions: a resistor cabinet, an air intake box and a support foot,

[0008] The left and right ends of the resistor cabinet are provided with rectangular grooves, the inner ends of the rectangular grooves are provided with mounting plates, the outer surface of the mounting plates is fixedly provided with sealing rings, and the sealing rings are tightly fitted to the inner ends of the resistor cabinets;

[0009] The air inlet box is fixedly installed at the inner end of the resistor cabinet, a slope is provided at the lower end of the air inlet box, and a dustproof net is fixedly installed at the upper end of the air inlet box;

[0010] The supporting foot is fixedly installed at the lower end of the resistor cabinet, the inner end of the supporting foot is provided with a slot, and the inner end of the slot is engaged with a height-increasing leg.

[0011] As a preferred technical solution of the utility model, the inner ends of the mounting plate and the resistor cabinet are threadedly connected with fastening screws to fix the mounting plate.

[0012] As a preferred technical solution of the utility model, an exhaust device is fixedly installed at the rear end of the resistor cabinet, and an air suction port is fixedly installed at the front end of the exhaust device.

[0013] As a preferred technical solution of the utility model, a shutter is fixedly installed at the rear end of the air inlet box, and the shutter is arranged on the inner side of the resistor cabinet.

[0014] As a preferred technical solution of the utility model, a cabinet door is rotatably installed at the front end of the resistor cabinet.

[0015] As a preferred technical solution of the utility model, the exhaust device is arranged on the upper side of the air intake box.

[0016] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0017] 1. It is equipped with a rectangular groove, a mounting plate, a sealing ring and fastening screws. If a single group of resistor cabinets is used, the mounting plate can be installed on the inner end of the rectangular groove with the fastening screws. The mounting plate plays a sealing role. If multiple groups are used together, the mounting plate can be removed and multiple groups of resistor cabinets can be placed side by side to form a whole for use, which can be suitable for different usage conditions;

[0018] 2. An air inlet box, shutters and dustproof net are provided. The shutters can isolate and protect the external rainwater. The air inlet box can completely prevent rainwater from entering the interior of the resistor cabinet. If the rainfall is heavy, the splashed rainwater can also flow out from the slope;

[0019] 3. It is equipped with supporting feet, card slots and heightening legs. The supporting feet can support the resistor cabinet alone, and the card slots can drain water and prevent siltation. If the installation site needs to be raised, the heightening legs can be inserted into the inside of the card slots for installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural diagram of the neutral point grounding resistor cabinet of the transformer of the utility model from the left side perspective;

[0021] Figure 2 It is a three-dimensional structural diagram of the neutral point grounding resistor cabinet of the transformer of the utility model from the right side perspective;

[0022] Figure 3 It is a schematic diagram of the cross-sectional structure of the neutral point grounding resistor cabinet of the transformer of the utility model;

[0023] Figure 4 This is a schematic diagram of the front view structure of the neutral point grounding resistor cabinet of the utility model transformer;

[0024] Among them: 1. Resistance cabinet; 2. Air inlet box; 3. Support feet; 4. Rectangular groove; 5. Mounting plate; 6. Sealing ring; 7. Fastening screws; 8. Shutters; 9. Dust net; 10. Exhaust equipment; 11. Air extraction port; 12. Heightening legs; 13. Ramp; 14. Slot; 15. Cabinet door. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0026] Example

[0027] Please refer to Figure 1-4 As shown, the utility model provides a technical solution: a transformer neutral point grounding resistor cabinet;

[0028] Rectangular grooves 4 are provided at the left and right ends of the resistor cabinet 1, and a mounting plate 5 is installed at the inner end of the rectangular groove 4. A sealing ring 6 is fixedly installed on the outer surface of the mounting plate 5, and the sealing ring 6 fits tightly to the inner end of the resistor cabinet 1. The mounting plate 5 and the inner end of the resistor cabinet 1 are threadedly connected with a fastening screw 7 to fix the mounting plate 5. An exhaust device 10 is fixedly installed at the rear end of the resistor cabinet 1, and an air extraction port 11 is fixedly installed at the front end of the exhaust device 10. A cabinet door 15 is rotatably installed at the front end of the resistor cabinet 1. The exhaust device 10 is arranged on the upper side of the air inlet box 2, and can be used alone or in groups assembled side by side for use, which is suitable for the installation of equipment of different sizes;

[0029] The air inlet box 2 is fixedly mounted on the inner end of the resistor cabinet 1, a slope 13 is arranged at the lower end of the air inlet box 2, a dust screen 9 is fixedly mounted on the upper end of the air inlet box 2, a shutter 8 is fixedly mounted on the rear end of the air inlet box 2, and the shutter 8 is arranged on the inner side of the resistor cabinet 1. The air inlet box 2 can completely prevent rainwater from entering the interior of the resistor cabinet 1. If the rainfall is large, the splashed rainwater can also flow out from the slope 13;

[0030] The support foot 3 is fixedly mounted on the lower end of the resistor cabinet 1 , and a slot 14 is provided at the inner end of the support foot 3 , and a height-increasing leg 12 is mounted on the inner end of the slot 14 , so as to facilitate adjustment of the support height.

[0031] Specific working principle:

[0032] like Figure 1 , Figure 2 and Figure 4 As shown, when the transformer neutral point grounding resistor cabinet is used, if a single group of resistor cabinets 1 is used, the mounting plate 5 can be installed on the inner end of the rectangular groove 4 by means of the fastening screws 7, and the sealing ring 6 plays a sealing role. The left and right ends of the resistor cabinet 1 are blocked to form a complete independent space, and the mounting plate 5 plays a sealing role. If multiple groups are assembled for use, the fastening screws 7 are unscrewed, the mounting plate 5 on the assembly surface is removed, and multiple groups of resistor cabinets 1 are placed side by side. Then, the two or more groups of resistor cabinets 1 are firmly installed by means of the connector and the fastening screws 7. The sealing strip at the outer end of the resistor cabinet 1 can play a sealing effect on the joint. After the fixing is completed, they are combined into a whole for use, which can be suitable for different usage conditions.

[0033] like Figure 1 and Figure 3 As shown, in rainy weather, the shutter 8 plays a role of isolating and protecting the external rainwater, and the air inlet box 2 can completely prevent rainwater from entering the interior of the resistor cabinet 1. If the rainfall is large, the splashed rainwater can also flow out from the slope 13. When heat dissipation is performed, the exhaust device 10 extracts the waste heat gas inside the resistor cabinet 1 through the air suction port 11 and discharges it, and then takes in air from the shutter 8 and the dustproof net 9, and the dustproof net 9 can filter the dust in the air;

[0034] like Figure 1 , Figure 2 and Figure 4 As shown, the resistor cabinet 1 is placed at the location where it is needed. The supporting feet 3 can support the resistor cabinet 1 alone, and the setting of the slot 14 can drain water and prevent siltation. If the installation location needs to be raised, the heightening leg 12 can be engaged with the inside of the slot 14 through the slot 14 to achieve installation. It is flexible and convenient to use. The above completes a series of operations of the transformer neutral point grounding resistor cabinet. The contents not described in detail in this description belong to the prior art known to professional and technical personnel in this field.

[0035] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A transformer neutral point grounding resistor cabinet, comprising: a resistor cabinet body (1), an air inlet box (2) and a support leg (3), characterized in that: The resistor cabinet (1) is provided with rectangular grooves (4) at both left and right ends, a mounting plate (5) is installed at the inner end of the rectangular groove (4), a sealing ring (6) is fixedly installed on the outer surface of the mounting plate (5), and the sealing ring (6) is tightly fitted on the inner end of the resistor cabinet (1); The air inlet box (2) is fixedly mounted on the inner end of the resistor cabinet (1), a slope (13) is provided at the lower end of the air inlet box (2), and a dustproof net (9) is fixedly mounted on the upper end of the air inlet box (2); The support foot (3) is fixedly mounted on the lower end of the resistor cabinet (1); a slot (14) is provided at the inner end of the support foot (3); and a height-increasing leg (12) is mounted in engagement with the inner end of the slot (14).

2. A transformer neutral point grounding resistor cabinet according to claim 1, characterized in that: The inner ends of the mounting plate (5) and the resistor cabinet (1) are threadedly connected with a fixing screw (7) to fix the mounting plate (5).

3. A transformer neutral point grounding resistor cabinet according to claim 1, characterized in that: An exhaust device (10) is fixedly mounted on the rear end of the resistor cabinet (1), and an exhaust port (11) is fixedly mounted on the front end of the exhaust device (10).

4. A transformer neutral point grounding resistor cabinet according to claim 1, characterized in that: A shutter (8) is fixedly mounted on the rear end of the air inlet box (2), and the shutter (8) is arranged on the inner side of the resistor cabinet (1).

5. The transformer neutral point grounding resistor cabinet according to claim 1, characterized in that: A cabinet door (15) is rotatably mounted on the front end of the resistor cabinet (1).

6. A transformer neutral point grounding resistor cabinet according to claim 3, characterized in that: The exhaust device (10) is arranged on the upper side of the air intake box (2).

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