A cooling device for a high current joint

Abstract

The present invention discloses a cooling device for a high-current joint, including a high-current joint, wherein the high-current joint is provided with an air inlet and an air outlet, and further comprises a temperature probe and a cooling mechanism, wherein the cooling mechanism is connected to the air inlet, and the temperature probe is connected to the high-current joint, and a compressed air source is introduced into the air inlet. The present invention can grasp the heating condition of the high-current joint in real time; no additional boosting equipment is required; it ensures the long-term reliable operation of the equipment, and can also filter the compressed air at the outlet of the cold dryer again to ensure that the compressed air sent to the joint is free of condensed water, oil, particulate matter and other impurities; any branch can be inspected and processed online, and the operation mode is flexible; the compressed air introduced into the sealed space where the joint is located is clean and dry, and can safely and effectively control the heating condition of the joint, so that the high-current joint is in a temperature-controllable state, and avoid the situation where the joint is forced to shut down due to overheating after maintenance.

Description

Technical Field

[0001] The invention relates to a cooling device for a high current joint. Background Art

[0002] The generator outlet and main transformer of large power plants are mostly connected by closed busbars. The closed busbars are made of metal aluminum, and the joints at both ends are made of aluminum silver plating. Under the condition of constant contact resistance, the heat generated at the joint is proportional to the square of the current flowing through. The current on the low-voltage side of the main transformer at the generator outlet is very large, and large units can reach 10,000-20,000 amperes. Therefore, a small change in the contact resistance of the joint will lead to a significant increase in heat generation. Since the generator outlet and the low-voltage side joints of the main transformer are in a confined space, the heat dissipation conditions are poor, and they only rely on natural ventilation cooling of the outer shell. When the silver plating layer of the joint is aged, the joint is dirty, or the joint is not tightened enough, it will bring the hidden danger of abnormal heating of the joint. If the heating of the joint is not handled in time, the equipment may be in a defective state for a long time. When the emergency defect identification standard is reached, the equipment needs to be shut down immediately, which will seriously affect the normal operation and safe production of the unit. Summary of the invention

[0003] The object of the present invention is to overcome the deficiencies in the prior art and provide a cooling device for a high current joint.

[0004] In order to achieve the above object, the present invention is achieved through the following technical solutions:

[0005] A cooling device for a high-current joint comprises a high-current joint, wherein the high-current joint is provided with an air inlet and an air outlet, and further comprises a temperature measuring probe and a cooling mechanism, wherein the cooling mechanism is connected to the air inlet, the temperature measuring probe is connected to the high-current joint, and a compressed air source is introduced into the air inlet.

[0006] Preferably, the cooling mechanism is provided with three branches, the three branches are a first branch, a second branch, and a third branch, the first branch is composed of a first regulating valve, a second regulating valve, a third regulating valve, a second drying tank and a three-stage filter A, the first regulating valve is connected to the second drying tank through the second regulating valve, the second drying tank is connected to the third regulating valve through the three-stage filter A, the second branch is composed of an eleventh regulating valve, a ninth regulating valve, and a first drying tank, the first regulating valve is connected to the eleventh regulating valve, the eleventh regulating valve is connected to the ninth regulating valve through the first drying tank, the third branch is composed of a fourth regulating valve, a fifth regulating valve, and a sixth regulating valve. The invention comprises a regulating valve, a sixth regulating valve, a seventh regulating valve, an eighth regulating valve, a tenth regulating valve, an H-class filter, a dryer, an F-class filter, a first cold dryer, a second cold dryer, a third-stage filter B, and a third-stage filter C. The first regulating valve is connected to the H-class filter through the fourth regulating valve, the H-class filter is connected to the F-class filter through the dryer, the F-class filter is connected to the sixth regulating valve through the fifth regulating valve, the sixth regulating valve is connected to the third-stage filter B through the second cold dryer, the fifth regulating valve is connected to the first cold dryer through the tenth regulating valve, and the first cold dryer is connected to the eighth regulating valve through the third-stage filter C.

[0007] Preferably, a centralized control center is further included, a gas quality monitoring unit is provided in the air inlet, and the gas quality monitoring unit is wirelessly connected to the centralized control center.

[0008] Preferably, the gas quality monitoring unit includes a temperature sensor module, a dew point module, and a pressure sensor module.

[0009] Preferably, a dryer is used to reduce the dew point of the compressed air.

[0010] Preferably, the first cold dryer and the second cold dryer are used to dry the compressed air and reduce the gas temperature.

[0011] Preferably, the temperature measuring probe is an infrared temperature measuring probe.

[0012] The beneficial effects of the present invention are as follows: the present invention can accurately and in real time grasp the heating condition of the large current joint through the temperature measuring probe and the centralized control center; it adopts the compressed air source with high pressure and large flow, and no additional boosting equipment is required; filters are installed in multiple links to filter out large particle impurities in the compressed air at the inlet of the dryer and the inlet of the cold dryer, ensuring the long-term reliable operation of the equipment, and the compressed air at the outlet of the cold dryer can be filtered again to ensure that the compressed air sent to the joint is free of condensed water, oil, particulate matter and other impurities; the device is provided with multiple branches, which can serve as backup for each other, and any branch can be inspected and processed online, and the operation mode is flexible; by adjusting the opening of the regulating valve and the parameter settings of the dryer and the cold dryer, the flow rate, dew point, temperature, etc. of the compressed air can be adjusted, and the temperature of the joint can be flexibly adjusted; the compressed air introduced into the sealed space where the joint is located is clean and dry, which can safely and effectively control the heating condition of the joint, so that the large current joint is in a temperature-controllable state, avoiding the situation where the joint is overheated and forced to shut down after maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention;

[0014] Figure 2 It is a structural schematic diagram of the cooling mechanism;

[0015] Figure 3 This is a composition diagram of the gas quality monitoring unit. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is further described below in conjunction with the accompanying drawings:

[0017] like Figure 1 As shown, a cooling device for a high current connector includes a high current connector 30, wherein the high current connector 30 is provided with an air inlet 301 and an air outlet 302, and further includes a temperature probe 31 and a cooling mechanism 32. The cooling mechanism 32 is connected to the air inlet 301, the temperature probe 31 is connected to the high current connector 30, and a compressed air source is introduced into the air inlet 301.

[0018] like Figure 2As shown, the cooling mechanism 32 is provided with three branches, the three branches are a first branch, a second branch, and a third branch, the first branch is composed of a first regulating valve 1, a second regulating valve 2, a third regulating valve 3, a second drying tank 11 and a three-stage filter A12, the first regulating valve 1 is connected to the second drying tank 11 through the second regulating valve 2, the second drying tank 11 is connected to the third regulating valve 3 through the three-stage filter A12, the second branch is composed of an eleventh regulating valve 21, a ninth regulating valve 9, and a first drying tank 20, the first regulating valve 1 is connected to the eleventh regulating valve 21, the eleventh regulating valve 21 is connected to the ninth regulating valve 9 through the first drying tank 20, the third branch is composed of a fourth regulating valve 4, a fifth regulating valve 5, a sixth regulating valve 6, a sixth regulating valve 7, a sixth regulating valve 8, a sixth regulating valve 9, a first regulating valve 10, a first regulating valve 11, a second regulating valve 12, a third regulating valve 13, a first regulating valve 14, a first regulating valve 15, a sixth regulating valve 16, a first regulating valve 17, a first regulating valve 18, a first regulating valve 19, a first regulating valve 20, a 6, a seventh regulating valve 7, an eighth regulating valve 8, a tenth regulating valve 10, an H-class filter 15, a dryer 16, an F-class filter 17, a first cold dryer 19, a second cold dryer 18, a third-stage filter B13, and a third-stage filter C14, wherein the first regulating valve 1 is connected to the H-class filter 15 through the fourth regulating valve 4, the H-class filter 15 is connected to the F-class filter 17 through the dryer 16, the F-class filter 17 is connected to the sixth regulating valve 6 through the fifth regulating valve 5, the sixth regulating valve 6 is connected to the third-stage filter B13 through the second cold dryer 18, the fifth regulating valve 5 is connected to the first cold dryer 19 through the tenth regulating valve 10, and the first cold dryer 19 is connected to the eighth regulating valve 8 through the third-stage filter C14.

[0019] like Figure 2 As shown, a centralized control center 33 is also included. A gas quality monitoring unit 303 is provided on the gas inlet 301 . The gas quality monitoring unit 303 is wirelessly connected to the centralized control center 33 .

[0020] like Figure 3 As shown, the gas quality monitoring unit 303 includes a temperature sensor module 304 , a dew point module 305 , and a pressure sensor module 306 .

[0021] like Figure 2 As shown, the dryer 16 is used to reduce the dew point of the compressed air, the first cold dryer 19 and the second cold dryer 18 are used to dry the compressed air and reduce the gas temperature, and the temperature measuring probe 31 is an infrared temperature measuring probe.

[0022] The present invention can monitor the temperature of the joint through a temperature measuring probe and a centralized control center. When the temperature exceeds the normal value, the joint is cooled by a cooling mechanism. The cooling effect can be manually adjusted to keep the joint temperature within a safe operating range. The invention includes an infrared temperature measuring device, a gas quality monitoring unit, a three-stage filter, a cold dryer, a drying tank, a dryer, a filter (class H, class F), etc. The present invention uses compressed air as the gas source, which is filtered through a filter, dried by a drying tank or a dryer, and then cooled by a cold dryer. Finally, it reaches the cooling part after passing through a three-stage filter. The device can adjust the compressed air flow, dew point and temperature by setting the opening of each regulating valve, the dryer and the cold dryer parameters.

[0023] The cooling mechanism 32 has three branches. The first branch is composed of only the first regulating valve, the second regulating valve, the third regulating valve, the second drying tank and the third-level filter element A, which is used as the last backup. Because of its poor drying effect, no cooling effect, and simple structure, it is only used as an emergency backup.

[0024] The third branch is composed of the fourth regulating valve, the fifth regulating valve, the sixth regulating valve, the seventh regulating valve, the eighth regulating valve, the tenth regulating valve, the H-class filter, the dryer, the F-class filter, the first cold dryer, the second cold dryer, the third-level filter B, and the third-level filter C. The filter can preliminarily filter impurities such as condensed water, oil, and particulate matter, the dryer can effectively reduce the dew point of compressed air, and the cold dryer can reduce the gas temperature while drying the compressed air. The sixth regulating valve 6, the second cold dryer 18, and the third-level filter B13 serve as a branch of the third branch, and the tenth regulating valve 10, the first cold dryer 19, the third-level filter C14, and the eighth regulating valve 8 serve as another branch of the third branch. Therefore, one branch and the other branch are mutually standby, and the cold dryer circuit can be checked and processed online.

[0025] The second branch is composed of the eleventh regulating valve 21, the ninth regulating valve 9, and the first drying tank 20. When the dryer in branch 3 needs to be inspected and processed, the gas entering the cold dryer can be temporarily dried.

[0026] The present invention can accurately and in real time grasp the heating condition of the large current joint through the temperature measuring probe and the centralized control center; it adopts the compressed air source with high pressure and large flow, and no additional boosting equipment is needed; filters are installed in multiple links to filter out large particle impurities in the compressed air at the inlet of the dryer and the inlet of the cold dryer, so as to ensure the long-term reliable operation of the equipment, and the compressed air at the outlet of the cold dryer can be filtered again to ensure that the compressed air sent to the joint is free of impurities such as condensed water, oil, and particulate matter; the device is provided with multiple branches, which can serve as backup for each other, and any branch can be inspected and processed online, and the operation mode is flexible; by adjusting the opening of the regulating valve and the parameter settings of the dryer and the cold dryer, the flow rate, dew point, temperature, etc. of the compressed air can be adjusted, and the temperature of the joint can be flexibly adjusted; the compressed air introduced into the sealed space where the joint is located is clean and dry, which can safely and effectively control the heating condition of the joint, so that the large current joint is in a temperature controllable state, and the situation that the joint is forced to shut down due to overheating after maintenance is avoided.

[0027] It should be noted that the above is only a specific embodiment of the present invention. Obviously, the present invention is not limited to the above embodiment, and there are many variations. In short, all variations that can be directly derived or associated with the content disclosed by ordinary technicians in this field should be considered as the protection scope of the present invention.

Claims

1. A cooling device for a high current joint, comprising a high current joint (30), wherein the high current joint (30) is provided with an air inlet (301) and an air outlet (302), characterized in that: It also includes a temperature measuring probe (31) and a cooling mechanism (32), wherein the cooling mechanism (32) is connected to an air inlet (301), the temperature measuring probe (31) is connected to a high current connector (30), and a compressed air source is introduced into the air inlet (301); The cooling mechanism (32) is provided with three branches, the three branches being a first branch, a second branch and a third branch. The first branch is composed of a first regulating valve (1), a second regulating valve (2), a third regulating valve (3), a second drying tank (11) and a three-stage filter A (12). The first regulating valve (1) is connected to the second drying tank (11) via the second regulating valve (2). The second drying tank (11) is connected to the third regulating valve (3) via the three-stage filter A (12). The second branch is composed of an eleventh regulating valve (21), a ninth regulating valve (9) and a first drying tank (20). The first regulating valve (1) is connected to the eleventh regulating valve (21). The eleventh regulating valve (21) is connected to the ninth regulating valve (9) via the first drying tank (20). The third branch is composed of a fourth regulating valve (4), a fifth regulating valve (5), a sixth regulating valve (6), a seventh regulating valve (7), an eighth regulating valve (8) and a second drying tank (20). The invention relates to a throttle valve (8), a tenth regulating valve (10), an H-class filter (15), a dryer (16), an F-class filter (17), a first cold dryer (19), a second cold dryer (18), a third-level filter B (13), and a third-level filter C (14); the first regulating valve (1) is connected to the H-class filter (15) through a fourth regulating valve (4); the H-class filter (15) is connected to the F-class filter (17) through the dryer (16); the F-class filter (17) is connected to the sixth regulating valve (6) through a fifth regulating valve (5); the sixth regulating valve (6) is connected to the third-level filter B (13) through the second cold dryer (18); the fifth regulating valve (5) is connected to the first cold dryer (19) through a tenth regulating valve (10); the first cold dryer (19) is connected to the eighth regulating valve (8) through the third-level filter C (14); and the temperature measuring probe (31) is an infrared temperature measuring probe.

2. A cooling device for a high current joint according to claim 1, characterized in that: It also includes a centralized control center (33), and a gas quality monitoring unit (303) is provided on the gas inlet (301), and the gas quality monitoring unit (303) is wirelessly connected to the centralized control center (33).

3. A cooling device for a high current joint according to claim 2, characterized in that: The gas quality monitoring unit (303) comprises a temperature sensor module, a dew point module and a pressure sensor module.

4. A cooling device for a high current joint according to claim 1, characterized in that: The dryer (16) is used to reduce the dew point of compressed air.

5. A cooling device for a high current joint according to claim 1, characterized in that: The first cold dryer (19) and the second cold dryer (18) are used to dry compressed air and reduce the gas temperature.

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