Cooling device of box-type transformer and working method of cooling device

Abstract

The invention discloses a cooling device of a box-type transformer and a working method of the cooling device in the technical field of box-type transformers, the cooling device comprises the box-type transformer, a cooling fin set is installed on the outer wall of the box-type transformer, an air cooling device is installed at the bottom of the cooling fin set, and the air cooling device blows airflow to the cooling fin set from bottom to top; the forced air cooling control system comprises a circuit breaker QF10, a contactor KM1, a contactor KM1 and a temperature control switch contact C1 / C2; the cooling device of the box-type transformer mainly comprises the cooling device and the forced air cooling control system, the cooling device provides a reasonable installation space, and the forced air cooling control system can guarantee normal, stable and reliable operation of a fan and box-type transformer equipment. The operating temperature of the box transformer substation can be greatly reduced, and the box transformer substation has important significance in prolonging the service life of equipment, reducing the failure rate and improving the generating capacity of a fan.

Description

Technical Field

[0001] The invention relates to a cooling device for a box-type transformer and a working method thereof, belonging to the technical field of box-type transformers. Background Art

[0002] A box-type transformer, often referred to as a "box transformer," combines a traditional transformer in a box-shaped enclosure. Its compact size, light weight, low noise, low losses, and high reliability make it widely used in residential areas, commercial centers, power stations, airports, factories, mines, enterprises, hospitals, and schools.

[0003] At present, the cooling method commonly used for box-type transformers is natural air cooling, such as the Chinese patent CN211858353U, which is a box-type transformer that is easy to dissipate heat. Due to the low terrain of some box-type transformers, the natural wind is blocked by hills, trees, etc. The box-type transformer cooling system is designed and laid out with fences on both sides. The lack of air convection causes heat blockage and poor heat dissipation effect, resulting in frequent over-temperature tripping of the box-type transformer.

[0004] Before this, the box-type transformer was in an unprotected operating mode due to problems such as UPS damage and the failure to put the protective control power circuit breaker into operation. After the box-type transformer tripped, the on-site measures were taken to remove the protective baffle outside the box-type transformer heat sink to increase air circulation to limit tripping. However, this method has a high operating temperature of the box-type transformer, and long-term operation will cause problems such as damage to the transformer winding and deterioration of the insulating oil, which is a high risk.

[0005] To this end, the present invention provides a cooling device for a box-type transformer and a working method thereof, which have solved the above problems. Summary of the Invention

[0006] In order to solve the above problems existing in the prior art, the present invention provides a cooling device for a box-type transformer and a working method thereof.

[0007] The technical solutions of the present invention are as follows:

[0008] A cooling device for a box-type transformer includes a box-type transformer 10, wherein a heat sink group 20 is mounted on the outer wall of the box-type transformer 10, and an air cooling device 30 is mounted on the bottom of the heat sink group 20, wherein the air cooling device 30 blows air from bottom to top toward the heat sink group 20;

[0009] The invention also includes a forced air cooling control system, wherein the forced air cooling control system includes:

[0010] Circuit breaker QF10; the upper end of the circuit breaker QF10 is connected to the three-phase power supply on the low-voltage side of the box transformer, and the lower end is connected to the axial flow fan in the air cooling device 30;

[0011] Contactor KM1; the contactor KM1 is provided on the power supply path of the axial flow fan 34 to control the start and stop of the axial flow fan;

[0012] Temperature control switch contacts C1 / C2; the temperature control switch contacts C1 / C2 are contacts of the oil level temperature controller of the box-type transformer 10. The temperature control switch contacts C1 / C2 take a 220V power supply from the lower end of the circuit breaker QF10, and the temperature control switch contacts C1 / C2 control the on and off of the contactor KM1.

[0013] As a preferred solution, a circuit breaker QF11 is connected in series to the 220V power supply circuit of the temperature-controlled switch contacts C1 / C2.

[0014] As a preferred solution, a power-off delay relay KT1 is connected in series to the circuit for the temperature-controlled switch contacts C1 / C2 to control the on / off of the contactor KM1.

[0015] As a preferred solution, the oil level temperature control threshold of the temperature-controlled switch contacts C1 / C2 is 60°C. When the oil level temperature is lower than 60°C, the temperature-controlled switch contacts C1 / C2 are closed.

[0016] As a preferred solution, the delay time of the power-off delay relay KT1 is set to 5 minutes.

[0017] As a preferred solution, the heat sink assembly 20 includes a mounting frame 21 that passes through from top to bottom, and the inner cavity of the mounting frame 21 is densely spaced with heat sinks 22 .

[0018] As a preferred solution, the heat sink group 20 is an L-shaped right-angle structure and is attached to the adjacent two outer walls of the box-type transformer 10.

[0019] As a preferred solution, the air cooling device 30 includes an air inlet chamber 31 , an air inlet 32 ​​is provided on the side of the air inlet chamber 31 , an air outlet 33 is provided at the upper end of the air inlet chamber 31 , and the axial flow fans 34 are arranged side by side in the air inlet chamber 31 .

[0020] As a preferred solution, a filter protection mesh cover 35 is provided on the outer side of the air inlet 32 ​​.

[0021] A working method of a cooling device for a box-type transformer, using the above-mentioned cooling device for a box-type transformer, is characterized by:

[0022] Use automatic temperature control to control the axial flow fan;

[0023] When the transformer oil temperature reaches the set value of 60℃, the temperature control switches C1 and C2 are closed, the power-off delay relay KT1 coil is energized, the KT1 contacts are instantaneously closed, the contactor KM1 coil is energized, the contacts are closed, and the axial flow fan is energized and starts running;

[0024] When the transformer oil temperature drops below the set value of 60℃, the temperature control switches C1 and C2 are disconnected, the power-off delay relay KT1 coil loses power, the KT1 contact closes after a delay of 5 minutes, the contactor KM1 coil loses power after 5 minutes, the contacts are disconnected, and the axial flow fan continues to run for 5 minutes before stopping.

[0025] Beneficial effects

[0026] The present invention's box-type transformer cooling system primarily comprises a cooling device and a forced air cooling control system. The cooling device provides reasonable installation space, while the forced air cooling control system ensures the normal, stable, and reliable operation of the fan and box-type transformer. This significantly reduces the box-type transformer's operating temperature, significantly extending equipment life, reducing failure rates, and increasing fan power generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the cooling device of the box-type transformer;

[0028] Figure 2 This is a schematic diagram of the forced air cooling control system for the cooling device of a box-type transformer;

[0029] Figure 3 Circuit diagram of the forced air cooling control system for the cooling device of the box-type transformer;

[0030] Figure 4 This is a schematic diagram of the heat sink group structure of the cooling device of the box-type transformer;

[0031] Figure 5 This is a schematic diagram of the structure of the air cooling device for the box-type transformer. DETAILED DESCRIPTION

[0032] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] Please refer to Figures 1 to 5 As shown, a cooling device for a box-type transformer includes a box-type transformer 10, a heat sink group 20 is installed on the outer wall of the box-type transformer 10, and an air cooling device 30 is installed at the bottom of the heat sink group 20, and the air cooling device 30 blows air from bottom to top toward the heat sink group 20;

[0035] It also includes a forced air cooling control system, which includes a circuit breaker QF10, a contactor KM1, a contactor KM1 and temperature control switch contacts C1 / C2:

[0036] Specifically, the upper end of the circuit breaker QF10 is connected to the three-phase power supply on the low-voltage side of the box transformer, and the lower end is connected to the axial flow fan in the air cooling device 30; the contactor KM1 is set on the power supply path of the axial flow fan 34 to control the start and stop of the axial flow fan;

[0037] The temperature control switch contacts C1 / C2 are contacts of the oil level temperature controller of the box-type transformer 10. The oil temperature signal is collected using the spare contacts of the transformer oil level temperature controller. The temperature control switch contacts C1 / C2 take a 220V power supply from the lower end of the circuit breaker QF10. The temperature control switch contacts C1 / C2 control the on and off of the contactor KM1.

[0038] Furthermore, in order to better cut off and connect the load circuit, cut off the fault circuit, prevent the accident from expanding, and ensure safe operation, a circuit breaker QF11 is connected in series to the 220V power supply circuit of the temperature control switch contacts C1 / C2.

[0039] Furthermore, to prevent the system from oscillating around the set temperature value, a time relay is added to the control circuit. The cooling fan starts instantly when the oil level temperature exceeds the set value, and delays operation for 5 minutes after the oil level temperature falls below the set value, thereby preventing system oscillation. Specifically, a power-off delay relay KT1 is connected in series to the circuit that controls the on / off of contactor KM1 through the temperature-controlled switch contacts C1 / C2. The oil level temperature control threshold of the temperature-controlled switch contacts C1 / C2 is 60°C. When the oil level temperature falls below 60°C, the temperature-controlled switch contacts C1 / C2 close, and the power-off delay relay KT1 is set to a delay of 5 minutes. During actual operation, when the transformer oil temperature reaches the set value of 60℃, the temperature control switches C1 and C2 are closed, the power-off delay relay KT1 coil is energized, the KT1 contacts are instantaneously closed, the contactor KM1 coil is energized, the contacts are attracted, and the axial flow fan is energized and starts running; when the transformer oil temperature drops below the set value of 60℃, the temperature control switches C1 and C2 are disconnected, the power-off delay relay KT1 coil is de-energized, the KT1 contacts are closed after a delay of 5 minutes, the contactor KM1 coil is de-energized after 5 minutes, the contacts are disconnected, and the axial flow fan continues to run for 5 minutes before stopping.

[0040] Furthermore, the heat sink group 20 includes a mounting frame 21 that runs through from top to bottom, and the inner cavity of the mounting frame 21 is densely spaced with heat sinks 22. The heat sink group 20 is an L-shaped right-angle structure and is attached to the adjacent outer walls of the box-type transformer 10; the wall-adhering side of the mounting frame 21 is in close contact with the outer wall of the box-type transformer 10 to perform efficient heat exchange, bringing the box-type transformer 10 out, and the temperature of the heat sink 22 rises accordingly. A heat dissipation airflow channel that runs through from top to bottom is formed between the heat sinks 22. As the air cooling device 30 below blows cold air, the heat sink 22 is effectively cooled, that is, the internal temperature of the box-type transformer 10 is effectively controlled, ensuring stable and efficient operation of the heat dissipation system.

[0041] Furthermore, the air cooling device 30 includes an air inlet chamber 31. Because the bottom of the air cooling device 30 is installed almost flat on the ground, to reduce airflow resistance, an air inlet 32 ​​is provided on the side of the air inlet chamber 31. An air outlet 33 is provided at the upper end of the air inlet chamber 31. Axial flow fans 34 are arranged side by side within the air inlet chamber 31. In this embodiment, five axial flow fans 34 are provided, namely axial flow fans M1-M5. During actual operation, external air, driven by the axial flow fans 34, enters through the air inlet 32 ​​and is discharged through the air outlet 33, forming a high-speed airflow that is delivered to the surface of the heat sink 22 for air cooling. Furthermore, a filter protection mesh 35 is provided on the outside of the air inlet 32 ​​to prevent debris and small animals from entering the air inlet chamber 31.

[0042] Example 2

[0043] Based on the cooling device for a box-type transformer in Example 1, the working method of the cooling device for a box-type transformer in this embodiment adopts automatic temperature control to control the axial flow fan, specifically:

[0044] When the transformer oil temperature reaches the set value of 60℃, the temperature control switches C1 and C2 are closed, the power-off delay relay KT1 coil is energized, the KT1 contacts are instantaneously closed, the contactor KM1 coil is energized, the contacts are closed, and the axial flow fan is energized and starts running;

[0045] When the transformer oil temperature drops below the set value of 60℃, the temperature control switches C1 and C2 are disconnected, the power-off delay relay KT1 coil loses power, the KT1 contact closes after a delay of 5 minutes, the contactor KM1 coil loses power after 5 minutes, the contacts are disconnected, and the axial flow fan continues to run for 5 minutes before stopping.

[0046] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention.

[0047] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the invention according to the specific circumstances.

[0048] While embodiments of the invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and alterations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cooling device for a box-type transformer, characterized in that: The invention comprises a box-type transformer (10), wherein a heat sink group (20) is installed on the outer wall of the box-type transformer (10), an air cooling device (30) is installed at the bottom of the heat sink group (20), and the air cooling device (30) blows air from bottom to top toward the heat sink group (20); The invention also includes a forced air cooling control system, wherein the forced air cooling control system includes: Circuit breaker QF10; the upper end of the circuit breaker QF10 is connected to the three-phase power supply on the low-voltage side of the box transformer, and the lower end is connected to the axial flow fan in the air cooling device (30); Contactor KM1; the contactor KM1 is arranged on the power supply path of the axial flow fan (34) to control the start and stop of the axial flow fan; Temperature control switch contacts C1 / C2; the temperature control switch contacts C1 / C2 are contacts of the oil level temperature controller of the box-type transformer (10), the temperature control switch contacts C1 / C2 are powered by 220V from the lower end of the circuit breaker QF10, and the temperature control switch contacts C1 / C2 control the on and off of the contactor KM1.

2. The cooling device for a box-type transformer according to claim 1, characterized in that: A circuit breaker QF11 is connected in series to the 220V power supply circuit of the temperature control switch contacts C1 / C2.

3. The cooling device for a box-type transformer according to claim 1, characterized in that: The circuit for controlling the on and off of the contactor KM1 by the temperature-controlled switch contacts C1 / C2 is connected in series with a power-off delay relay KT1.

4. The cooling device for a box-type transformer according to claim 1, characterized in that: The oil level temperature control threshold of the temperature control switch contacts C1 / C2 is 60°C. When the oil level temperature is lower than 60°C, the temperature control switch contacts C1 / C2 are closed.

5. The cooling device for a box-type transformer according to claim 2, characterized in that: The delay time of the power-off delay relay KT1 is set to 5 minutes.

6. The cooling device for a box-type transformer according to claim 1, characterized in that: The heat sink group (20) comprises a mounting frame (21) that penetrates from top to bottom, and the inner cavity of the mounting frame (21) is densely spaced with heat sinks (22).

7. The cooling device for a box-type transformer according to claim 1, characterized in that: The heat sink group (20) is an L-shaped right-angle structure and is attached to the adjacent outer walls of the box-type transformer (10).

8. The cooling device for a box-type transformer according to claim 1, characterized in that: The air cooling device (30) includes an air inlet chamber (31), an air inlet (32) is provided on the side of the air inlet chamber (31), an air outlet (33) is provided at the upper end of the air inlet chamber (31), and the axial flow fan (34) is arranged side by side in the air inlet chamber (31).

9. The cooling device for a box-type transformer according to claim 8, characterized in that: A filtering protection screen (35) is provided on the outside of the air inlet (32).

10. A method for operating a cooling device for a box-type transformer, using the cooling device for a box-type transformer according to any one of claims 1 to 9, characterized in that: Use automatic temperature control to control the axial flow fan; When the transformer oil temperature reaches the set value of 60℃, the temperature control switches C1 and C2 are closed, the power-off delay relay KT1 coil is energized, the KT1 contacts are instantaneously closed, the contactor KM1 coil is energized, the contacts are closed, and the axial flow fan is energized and starts running; When the transformer oil temperature drops below the set value of 60℃, the temperature control switches C1 and C2 are disconnected, the power-off delay relay KT1 coil loses power, the KT1 contact closes after a delay of 5 minutes, the contactor KM1 coil loses power after 5 minutes, the contacts are disconnected, and the axial flow fan continues to run for 5 minutes before stopping.

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