Main transformer protection measurement and control cabinet in terminal substation

Abstract

The invention relates to the technical field of power equipment, and discloses a main transformer protection measurement and control cabinet in a terminal substation, which comprises an outer cabinet body, an inner cabinet body and a cabinet door, the inner cabinet body is fixed on the inner back surface of the outer cabinet body, the inner cabinet body is used for accommodating electrical elements, the cabinet door is hinged on the outer cabinet body, and the cabinet door is used for sealing the outer cabinet body and the inner cabinet body simultaneously. An air flow channel is arranged between the outer cabinet body and the inner cabinet body, the air flow channel is in a door shape, air inlet holes are formed in the two side walls of the outer cabinet body, an air outlet hole is formed in the top of the outer cabinet body, and a fan is installed on the air outlet hole. The beneficial effects are that the sealed inner cabinet body prevents steam from entering and damaging internal circuits and electric appliances, normal work of the transformer station is guaranteed, cold air flowing in the air flow channel carries out indirect air cooling heat dissipation on electrical elements in the inner cabinet body, rapid aging of the electrical elements caused by high temperature is avoided, and the service life of the transformer station is prolonged. And the normal service life of the electrical element is ensured.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, and in particular to a main transformer protection and control cabinet in a terminal substation. Background Technology

[0002] A substation is a location in a power system that transforms voltage and current, receives electrical energy, and distributes it. Substations located within power plants are step-up substations, whose function is to step up the voltage of the electrical energy generated by generators before feeding it into the high-voltage power grid. Substations are classified into the following four types: (1) Class I substations. These refer to AC UHV substations, nuclear power plants, large energy bases (3 million kW and above) transmitting power to other regions, and 750 / 500 / 330kV substations connecting major regions (North China, Central China, East China, Northeast China, Northwest China).

[0003] (2) Class II substations. These are all substations other than Class I substations, including 750 / 500 / 330kV substations, power plant transmission substations (1 million kW and above, below 3 million kW) and 220kV inter-provincial interconnection substations, and substations where the main transformer or busbar is out of service or the switch fails to operate, resulting in a power grid incident of level IV or above.

[0004] (3) Class III substations. These are 220kV substations other than Class II substations, power plant power transmission substations (300,000 kW and above, below 1,000,000 kW), substations where the main transformer or busbar is out of service or the switch fails to operate, causing a Level 5 power grid event, and substations that directly supply power to Level 1 or above important users.

[0005] (4) Class IV substations. These are 35kV and above substations other than Class I, II and III substations.

[0006] In various substations, line monitoring and control cabinets are essential equipment. Their main function is to measure electrical quantities on the lines and provide protection during line faults. This includes monitoring signals from primary and secondary equipment within the substation, such as the position of disconnect switches, various alarm signals from circuit breakers, protective actions and alarm signals from protection devices, and voltage and current in lines and busbars. They also provide remote control functions for opening and closing disconnect switches.

[0007] Chinese utility model patent (authorization announcement number: CN210326632U, title: a power grid line measurement and control cabinet) includes a cabinet door, a cabinet body, and a signal connection line. The cabinet door is mounted on the cabinet body and rotates along one side of the cabinet body. An LCD screen is mounted on the cabinet door, and a switch is mounted on the cabinet door below the LCD screen. Ventilation and heat dissipation holes are mounted on the cabinet door below the switch. Several sets of support plates are horizontally arranged on the inner side of the cabinet body, and anti-magnetic interference plates are mounted below each support plate. The power grid line measurement and control cabinet described in this utility model places the power cords on each layer of support plates, with all power cords passing through wiring holes, making the power cords neater. The sensing module can transmit the power data information in the power cords to the LCD screen through the signal connection line, making it convenient for maintenance personnel to read. The ventilation and heat dissipation holes can expel hot air from the cabinet, preventing excessively high temperatures. The insect repellent box can repel pests, making the equipment usable in rural areas. However, as a device for measuring electrical quantities and protecting circuits in substations, if water enters the control cabinet, causing short circuits and damage to the internal circuits and electrical components, it will affect the normal operation of the substation, making it impossible for the control cabinet to measure and control electrical quantities. If the high-voltage incoming line cabinet, transformer cabinet, and low-voltage substation cabinet malfunction, it cannot be dealt with in a timely manner, posing a safety hazard. Summary of the Invention

[0008] The purpose of this invention is to provide a main transformer protection and control cabinet in a terminal substation to overcome the shortcomings of the prior art.

[0009] The objective of this invention is achieved through the following technical solution: A main transformer protection and control cabinet in a terminal substation includes an outer cabinet, an inner cabinet, and a cabinet door. The inner cabinet is fixed to the inner back of the outer cabinet and is used to house electrical components. The cabinet door is hinged to the outer cabinet and is used to simultaneously seal the outer cabinet and the inner cabinet. An airflow channel is provided between the outer cabinet and the inner cabinet. The airflow channel is U-shaped. Air inlets are provided on both side walls of the outer cabinet, and an air outlet is provided on the top of the outer cabinet. A fan is installed on the air outlet.

[0010] Preferably, a plurality of partitions are fixed inside the airflow channel. The partitions are in the shape of a door and are used to divide the airflow channel into a plurality of pressure equalizing channels. There are a plurality of air inlets, and each pressure equalizing channel has at least one air inlet on each side.

[0011] Preferably, the inner cabinet is provided with a mounting component, which includes a channel steel, a support plate, and a mounting plate. One channel steel is fixed to one side wall and one inner back of the inner cabinet. Two channel steels are located at opposite corners of the inner cabinet. The support plate is hinged to the channel steel near the cabinet opening. The mounting plate is hinged to the side of the support plate away from the channel steel. The mounting plate is provided with bolts for locking the mounting plate to the channel steel located on the back of the inner cabinet. The mounting plate is also provided with a mounting groove for installing the electrical components.

[0012] Preferably, a rainproof canopy is fixed to the top of the outer cabinet, and the fan is located below the rainproof canopy.

[0013] Preferably, the edge of the rainproof canopy is provided with a drainage channel, which is U-shaped and surrounds the top outer side of the outer cabinet. Drainage pipes are provided at the bottom of the drainage channel on both sides of the outer cabinet. A water collection tank is fixed on the side wall of the outer cabinet below the drainage pipes. A brush roller is slidably installed on the side wall of the outer cabinet for brushing the air inlet. A controller is fixed on the outer wall of the water collection tank. A water outlet pipe is provided on the side wall of the water collection tank. A solenoid valve is installed in the water outlet pipe. The controller is used to open and close the solenoid valve. A water level sensor and a buoyancy mechanism are installed in the water collection tank. The electrical signal of the water level sensor is received by the controller. The buoyancy mechanism is used to raise and lower the brush roller.

[0014] Preferably, the mounting groove is T-shaped.

[0015] Preferably, the buoyancy mechanism includes a float, pulleys, and ropes. The float is located inside the water collection tank. The pulleys are installed on both the outer cabinet and the water collection tank. The ropes wound around the pulleys are used to connect the brush roller and the float.

[0016] Preferably, there are several mounting slots arranged in a matrix.

[0017] The present invention has the following advantages: 1. The sealed inner cabinet prevents moisture from entering and damaging the internal circuits and electrical appliances, ensuring the normal operation of the substation. At the same time, the cool air flowing in the airflow channel indirectly cools the electrical components inside the inner cabinet, preventing them from aging rapidly due to high temperatures and ensuring their normal service life.

[0018] 2. The uniform channels formed by the partitions enable efficient heat dissipation under the same fan static pressure, reducing energy consumption during the heat dissipation process of the inner cabinet, making it energy-saving and environmentally friendly.

[0019] 3. By using channel steel, support plates, and mounting plates, the technical effect of rotating the components in the inner cabinet to the outside of the inner cabinet for installation or maintenance is achieved, thus solving the technical problem of difficulty in installing or maintaining the components in the inner cabinet.

[0020] 4. As the water level in the collection tank rises, the buoyancy mechanism pulls the brush roller upwards. After the water level sensor detects that the water level in the collection tank has risen to a preset position, the controller opens the solenoid valve to drain the water. At this time, the buoyancy mechanism descends with the water level, and the brush roller also falls back to its original position under the action of gravity. This process is repeated to clean the air inlet, preventing dust from accumulating and clogging the air inlet, which would affect the heat dissipation of the inner cabinet. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Partial sectional view Figure 1 ; Figure 3 for Figure 1 Partial sectional view Figure 2 ; Figure 4 for Figure 1 Partial sectional view Figure 3 ; Figure 5 for Figure 1 Partial sectional view Figure 4 ; Figure 6 for Figure 5 A magnified view of a portion of point A in the middle; Figure 7 Schematic diagram of the mounting component Figure 1 ; Figure 8 Schematic diagram of the mounting components Figure 2 ; In the diagram, 1-outer cabinet, 2-inner cabinet, 3-cabinet door, 4-air inlet, 5-fan, 6-partition, 7-channel steel, 8-support plate, 9-mounting plate, 10-bolt, 11-mounting groove, 12-rainproof canopy, 13-drainage trough, 14-drainage pipe, 15-water collection tank, 16-brush roller, 17-float ball, 18-pulley, 19-rope. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] like Figure 1-6As shown, a main transformer protection and control cabinet in a terminal substation includes an outer cabinet 1, an inner cabinet 2, and a cabinet door 3. The inner cabinet 2 is fixed to the inner back of the outer cabinet 1 and is used to house electrical components. The cabinet door 3 is hinged to the outer cabinet 1, and a rubber sheet is installed on the inside of the cabinet door 3. The cabinet door 3 seals both the outer cabinet 1 and the inner cabinet 2 simultaneously through the rubber sheet. An airflow channel is provided between the outer cabinet 1 and the inner cabinet 2. The airflow channel is U-shaped. Air inlets 4 are provided on both side walls of the outer cabinet 1, and an air outlet is provided on the top of the outer cabinet 1. A fan 5 is installed on the air outlet. The sealed inner cabinet 2 prevents moisture from entering and damaging the internal circuits and electrical appliances, ensuring the normal operation of the substation. At the same time, the cold air flowing in the airflow channel indirectly cools the electrical components in the inner cabinet 2, preventing the electrical components from aging rapidly due to high temperatures and ensuring the normal service life of the electrical components.

[0029] In this embodiment, as Figure 6 As shown, several partitions 6 are fixed inside the airflow channel. The partitions 6 are in the shape of a door. The partitions 6 are used to divide the airflow channel into several equal pressure channels. There are several air inlets 4. Each equal pressure channel has at least one air inlet 4 on both sides. Through the uniform channel formed by the partitions 6, efficient heat dissipation can be achieved under the same static pressure of the fan 5, which reduces the energy consumption in the heat dissipation process of the inner cabinet 2, making it energy-saving and environmentally friendly.

[0030] In this embodiment, as Figure 1 , 7 As shown in Figure 8, the inner cabinet 2 is equipped with mounting components, including channel steel 7, support plate 8, and mounting plate 9. A channel steel 7 is fixed to one side wall and the inner back of the inner cabinet 2, with two channel steels 7 located at opposite corners of the inner cabinet 2. The support plate 8 is hinged to the channel steel 7 near the cabinet opening, and the mounting plate 9 is hinged to the side of the support plate 8 away from the channel steel 7. Several hinges are used to connect the support plate 8 to the channel steel 7 and the mounting plate 9, enhancing the stability of the hinged connection. The mounting plate 9 is equipped with… There are bolts 10, which are used to lock the mounting plate 9 onto the channel steel 7 located on the back of the inner cabinet 2. The mounting plate 9 is also provided with mounting grooves 11. The mounting grooves 11 are T-shaped and are arranged in a matrix. The mounting grooves 11 are used to install electrical components. Through the channel steel 7, the support plate 8 and the mounting plate 9, the technical effect of rotating the components in the inner cabinet 2 to the outside of the inner cabinet 2 for installation or maintenance is achieved, which solves the technical problem of the difficulty in installing or maintaining the components in the inner cabinet 2.

[0031] In this embodiment, as Figure 1-4 As shown, a rain shelter 12 is fixed to the top of the outer cabinet 1, and the fan 5 is located below the rain shelter 12 to prevent debris from falling into the fan 5, which could damage the fan blades and affect the heat dissipation of the inner cabinet 2. At the same time, it can also prevent the fan 5 from being exposed to the sun and rain, thus extending the service life of the fan 5.

[0032] In this embodiment, as Figure 2 As shown, the edge of the rain shelter 12 is provided with a drainage channel 13, which is U-shaped and surrounds the top outer side of the outer cabinet 1. Drainage pipes 14 are provided at the bottom of the drainage channels 13 on both sides of the outer cabinet 1. A water collection tank 15 is fixed on the side wall of the outer cabinet 1 below the drainage pipes 14. A brush roller 16 is slidably installed on the side wall of the outer cabinet 1 for brushing the air inlet 4. A controller is fixed on the outer wall of the water collection tank 15. A water outlet pipe is provided on the side wall of the water collection tank 15, and a solenoid valve is installed inside the water outlet pipe. The controller is used to open and close the solenoid valve. An internal water level sensor and buoyancy mechanism are installed. The electrical signal of the water level sensor is received by the controller. The buoyancy mechanism is used to raise and lower the brush roller 16. As the water level of the rainwater collected in the water collection tank 15 rises, the buoyancy mechanism pulls the brush roller 16 upward. After the water level sensor detects that the water level in the water collection tank 15 has risen to a preset position, the controller opens the solenoid valve to drain the water. At this time, the buoyancy mechanism descends with the water level, and the brush roller 16 also falls back to its original position under the action of gravity. This process is repeated to clean the air inlet 4, preventing dust from accumulating and clogging the air inlet 4, thus affecting the heat dissipation of the inner cabinet 2.

[0033] In this embodiment, as Figure 2 As shown, the buoyancy mechanism includes a float 17, a pulley 18, and a rope 19. The float 17 is located inside the water collection tank 15. Both the outer cabinet 1 and the water collection tank 15 are equipped with pulleys 18. The rope 19, which is wrapped around the pulley 18, is used to connect the brush roller 16 and the float 17, smoothly linking the float 17 and the brush roller 16. This allows the rising or falling motion of the float 17 to be quickly responded to by the brush roller 16, preventing the brush roller 16 from getting stuck during the cleaning process, which would block the air inlet 4 and affect the heat dissipation of the inner cabinet 2.

[0034] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A main transformer protection and control cabinet in a terminal substation, comprising an outer cabinet (1), an inner cabinet (2), and a cabinet door (3), wherein the inner cabinet (2) is fixed to the inner back of the outer cabinet (1), the inner cabinet (2) is used to house electrical components, and the cabinet door (3) is hinged to the outer cabinet (1), the cabinet door (3) is used to simultaneously seal the outer cabinet (1) and the inner cabinet (2), characterized in that: An airflow channel is provided between the outer cabinet (1) and the inner cabinet (2). The airflow channel is in the shape of a door. Air inlets (4) are provided on both sides of the outer cabinet (1). An air outlet is provided on the top of the outer cabinet (1). A fan (5) is installed on the air outlet.

2. The main transformer protection and control cabinet in a terminal substation according to claim 1, characterized in that: The airflow channel is fixed with several partitions (6), which are in the shape of a door. The partitions (6) are used to divide the airflow channel into several equal pressure channels. There are several air inlets (4), and there is no less than one air inlet (4) on each side of the equal pressure channel.

3. The main transformer protection and control cabinet in a terminal substation according to claim 1, characterized in that: The inner cabinet (2) is provided with mounting components, which include channel steel (7), support plate (8) and mounting plate (9). One channel steel (7) is fixed on one side wall and the inner back of the inner cabinet (2). The two channel steels (7) are located at a pair of opposite corners of the inner cabinet (2). The support plate (8) is hinged to the channel steel (7) near the cabinet opening. The mounting plate (9) is hinged to the side of the support plate (8) away from the channel steel (7). The mounting plate (9) is provided with bolts (10). The bolts (10) are used to lock the mounting plate (9) to the channel steel (7) located on the back of the inner cabinet (2). The mounting plate (9) is also provided with mounting grooves (11). The mounting grooves (11) are used to install the electrical components.

4. The main transformer protection and control cabinet in a terminal substation according to claim 1, characterized in that: The top of the outer cabinet (1) is fixed with a rainproof canopy (12), and the fan (5) is located below the rainproof canopy (12).

5. The main transformer protection and control cabinet in a terminal substation according to claim 3, characterized in that: The mounting groove (11) is T-shaped.

6. The main transformer protection and control cabinet in a terminal substation according to claim 4, characterized in that: The edge of the rain shelter (12) is provided with a drainage trough (13), which is shaped like a square. The drainage trough (13) surrounds the top outside of the outer cabinet (1). Drainage pipes (14) are provided at the bottom of the drainage troughs (13) on both sides of the outer cabinet (1). A water collection tank (15) is fixed on the side wall of the outer cabinet (1) below the drainage pipes (14). A brush roller (16) is slidably installed on the side wall of the outer cabinet (1). The brush roller (16) is used to brush the air inlet (4). A controller is fixed on the outer wall of the water collection tank (15). A water outlet pipe is provided on the side wall of the water collection tank (15). A solenoid valve is installed in the water outlet pipe. The controller is used to open and close the solenoid valve. A water level sensor and a buoyancy mechanism are installed in the water collection tank (15). The electrical signal of the water level sensor is received by the controller. The buoyancy mechanism is used to raise and lower the brush roller (16).

7. The main transformer protection and control cabinet in a terminal substation according to claim 5, characterized in that: The buoyancy mechanism includes a float (17), a pulley (18), and a rope (19). The float (17) is located inside the water collection tank (15). The pulley (18) is installed on both the outer cabinet (1) and the water collection tank (15). The rope (19) wrapped around the pulley (18) is used to connect the brush roller (16) and the float (17).

8. The main transformer protection and control cabinet in a terminal substation according to claim 6, characterized in that: The mounting slots (11) are several and arranged in a matrix.

Images