Liquid immersion type power equipment temperature control method and liquid immersion type power equipment system

Abstract

The invention discloses a liquid immersion type power equipment temperature control method and a liquid immersion type power equipment system, which can balance the temperature of liquid immersion type power equipment, avoid electrical faults caused by too low temperature of the liquid immersion type power equipment, and avoid the problem of accelerated aging speed of insulating oil caused by too high temperature of the liquid immersion type power equipment. The liquid immersion type power equipment temperature control method comprises the steps that the temperature of insulating oil in a first liquid immersion type power equipment oil tank and the temperature of insulating oil in a second liquid immersion type power equipment oil tank are detected; and if the temperature of the insulating oil in the oil tank of the first liquid-immersed power equipment is different from the temperature of the insulating oil in the oil tank of the second liquid-immersed power equipment, circulating the insulating oil between the oil tank of the first liquid-immersed power equipment and the oil tank of the second liquid-immersed power equipment, and the temperature of the first liquid immersion type power equipment and the temperature of the second liquid immersion type power equipment are balanced through the insulating oil.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric power equipment, and in particular relates to a temperature control method for liquid-immersed electric power equipment and a liquid-immersed electric power equipment system. Background Art

[0002] Liquid-immersed power equipment, such as transformers and reactors, is critical to the safety and stability of the power grid. Liquid-immersed power equipment often uses insulating fluid (such as insulating oil) as both an electrical insulation and cooling medium. The moisture and gas content in the insulating fluid directly impacts its insulation properties. Therefore, vacuum oil filling is often used during the production and installation of oil-immersed equipment and reactors to improve product quality.

[0003] When liquid-immersed electrical equipment is installed or stored at low temperatures (e.g., below 5°C), the low temperature can cause the water in the insulating oil to separate from the insulating cardboard and oil, forming tiny suspended water balls, which can reduce the insulation performance of the insulation structure of the equipment. Furthermore, when the equipment uses a forced oil circulation structure and the oil pump is started at low temperatures, static electricity may be generated due to the rapid movement of the insulating oil on the insulation layer, causing the insulating oil to show a positive charge and the insulating components to show a negative charge, leading to flashover or partial discharge, and even causing serious dielectric failure, affecting the safe operation of the equipment. Transformers, reactors, and other liquid-immersed electrical equipment often experience electrical failures due to the above reasons after installation or storage at low temperatures. Currently, the industry uses auxiliary heating during the installation phase or re-filtering or hot oil circulation after long-term low-temperature storage to avoid the above problems, which increases the cost of equipment operation.

[0004] On the other hand, when the liquid-immersed power equipment is running at full power, the temperature of the liquid-immersed power equipment will be too high due to the limited heat dissipation effect of its own heat dissipation device.

[0005] (For example, exceeding 80°C), which leads to the problem of accelerated aging of the insulating oil. Currently, the industry adopts the method of adding additional forced fans to dissipate heat for liquid-immersed power equipment.

[0006] Therefore, how to avoid electrical failures caused by low-temperature storage of liquid-immersed power equipment and the accelerated aging of insulating oil caused by high temperatures during high-load operation are problems that still need to be solved. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art and provide a temperature control method and a system for liquid-immersed power equipment, which can balance the temperature of the liquid-immersed power equipment, avoid electrical failures caused by too low a temperature of the liquid-immersed power equipment, and avoid the problem of accelerated aging of insulating oil caused by too high a temperature of the liquid-immersed power equipment.

[0008] In a first aspect, an embodiment of the present invention provides a temperature control method for liquid-immersed electrical equipment. The temperature control method for liquid-immersed electrical equipment is applied to a liquid-immersed electrical equipment system, wherein the liquid-immersed electrical equipment system includes a first liquid-immersed electrical equipment and at least one second liquid-immersed electrical equipment, wherein the oil tank of the first liquid-immersed electrical equipment and the oil tank of the second liquid-immersed electrical equipment are connected. The temperature control method for liquid-immersed electrical equipment includes: detecting the temperature of the insulating oil in the oil tank of the first liquid-immersed electrical equipment and the temperature of the insulating oil in the oil tank of the second liquid-immersed electrical equipment; if the temperature of the insulating oil in the oil tank of the first liquid-immersed electrical equipment is different from the temperature of the insulating oil in the oil tank of the second liquid-immersed electrical equipment, circulating the insulating oil between the oil tanks of the first liquid-immersed electrical equipment and the second liquid-immersed electrical equipment, so as to balance the temperatures of the first liquid-immersed electrical equipment and the second liquid-immersed electrical equipment through the insulating oil.

[0009] In some embodiments, the oil tank of the first liquid-immersed electrical device and the oil tank of the second liquid-immersed electrical device are connected via a connecting pipe, and a circulation pump is provided on the connecting pipe. Circulating the insulating oil between the oil tanks of the first liquid-immersed electrical device and the second liquid-immersed electrical device specifically comprises activating the circulation pump, which drives the insulating oil to circulate between the oil tanks of the first liquid-immersed electrical device and the second liquid-immersed electrical device.

[0010] In some embodiments, after circulating the insulating oil between the first liquid-immersed electrical equipment and the second liquid-immersed electrical equipment, the method further includes: determining whether an insulating oil loss failure occurs in the first liquid-immersed electrical equipment and / or the second liquid-immersed electrical equipment; and disconnecting the connecting pipe when an insulating oil loss failure occurs in the first liquid-immersed electrical equipment and / or the second liquid-immersed electrical equipment.

[0011] In some embodiments, after circulating the insulating oil between the first liquid-immersed electrical equipment and the second liquid-immersed electrical equipment, the method further includes: detecting the temperature of the insulating oil in the connecting pipe; and when the insulating oil temperature is lower than a preset temperature, shutting down the heat dissipation device of the first liquid-immersed electrical equipment and / or the second liquid-immersed electrical equipment.

[0012] Therefore, the temperature control method for liquid-immersed power equipment provided in the embodiment of the present invention can detect the temperature of the insulating oil in the oil tank of the first liquid-immersed power equipment and the temperature of the insulating oil in the oil tank of the second liquid-immersed power equipment. When the temperature of the insulating oil in the oil tank of the first liquid-immersed power equipment and the temperature of the insulating oil in the oil tank of the second liquid-immersed power equipment are different, the insulating oil can be circulated between the oil tank of the first liquid-immersed power equipment and the oil tank of the second liquid-immersed power equipment. The insulating oil can drive heat to flow from the high-temperature equipment to the low-temperature equipment to heat the low-temperature equipment, and at the same time, the insulating oil can drive cold to flow from the low-temperature equipment to the high-temperature equipment to cool the high-temperature equipment. In this way, the temperatures of the first liquid-immersed power equipment and the second liquid-immersed power equipment can be balanced, thereby avoiding electrical faults caused by too low a temperature of the liquid-immersed power equipment and the problem of accelerated aging of the insulating oil caused by too high a temperature rise of the liquid-immersed power equipment, thereby improving the operational reliability of the liquid-immersed power equipment.

[0013] In a second aspect, an embodiment of the present invention further provides a liquid-immersed power equipment system, comprising a first liquid-immersed power equipment, at least one second liquid-immersed power equipment, a coupling assembly, a controller, and a drive assembly. The first liquid-immersed power equipment is provided with a first temperature sensor for detecting the temperature of the insulating oil in the oil tank of the first liquid-immersed power equipment. The second liquid-immersed power equipment is provided with a second temperature sensor for detecting the temperature of the insulating oil in the oil tank of the second liquid-immersed power equipment. The coupling assembly is configured to connect the oil tanks of the first liquid-immersed power equipment and the second liquid-immersed power equipment. The controller is electrically connected to both the first and second temperature sensors and is configured to control the drive assembly based on the temperature of the insulating oil in the oil tanks of the first and second liquid-immersed power equipment. The drive assembly is provided on the coupling assembly and is configured to be controlled by the controller.

[0014] In some embodiments, the coupling assembly includes a coupling pipe connecting the oil tank of the first liquid-immersed electrical device and the oil tank of the second liquid-immersed electrical device, configured to circulate insulating oil between the oil tanks of the first liquid-immersed electrical device and the second liquid-immersed electrical device. The drive assembly includes a circulation pump, disposed on the coupling pipe and electrically connected to the controller, configured to drive the insulating oil in the coupling pipe to flow under the control of the controller.

[0015] In some embodiments, the first liquid-immersed power equipment and the second liquid-immersed power equipment both include a heat dissipation device, which includes a heat sink, a fan and an oil pump; the controller is also electrically connected to the fan and the oil pump on the heat dissipation device of the first liquid-immersed power equipment and the second liquid-immersed power equipment, and is also used to control the fan of the heat dissipation device of the first liquid-immersed power equipment and the second liquid-immersed power equipment according to the temperature of the insulating oil in the oil tank of the first liquid-immersed power equipment and the temperature of the insulating oil in the oil tank of the second liquid-immersed power equipment, and to control the oil pump of the heat dissipation device of the first liquid-immersed power equipment and the second liquid-immersed power equipment.

[0016] In some embodiments, the liquid-immersed electrical equipment system further includes an alarm assembly and a shut-off valve. The alarm assembly includes a first gas relay and a second gas relay. The first gas relay is disposed on the first liquid-immersed electrical equipment and is configured to issue a first alarm signal when insulating oil in the first liquid-immersed electrical equipment is lost. The second gas relay is disposed on the second liquid-immersed electrical equipment and is configured to issue a second alarm signal when insulating oil in the second liquid-immersed electrical equipment is lost. The shut-off valve is disposed on the connecting pipe and is electrically connected to the controller. The controller is also electrically connected to the first gas relay, the second gas relay, and the shut-off valve and is configured to determine whether the first liquid-immersed electrical equipment has failed upon receiving the first alarm signal, determine whether the second liquid-immersed electrical equipment has failed upon receiving the second alarm signal, and control the shut-off valve to open to disconnect the connecting pipe if a fault is determined in the first liquid-immersed electrical equipment and / or the second liquid-immersed electrical equipment.

[0017] In some embodiments, the oil tank of the first liquid-immersed power device is provided with a first upper port and a first lower port, and the oil tank of the second liquid-immersed power device is provided with a second upper port and a second lower port. The connecting pipe includes an upper connecting pipe and a lower connecting pipe. The upper connecting pipe connects the first upper port and the second upper port. The lower connecting pipe connects the first lower port and the second lower port. The circulating pump is provided on the lower connecting pipe.

[0018] In some embodiments, the upper connecting pipe is composed of two sections of first sub-pipes, which are connected by a first bellows; the lower connecting pipe is composed of two sections of second sub-pipes, which are connected by a second bellows.

[0019] The liquid-immersed power equipment system provided by the embodiment of the present invention has the same beneficial effects as the above-mentioned liquid-immersed power equipment temperature control method, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 : A flow chart of a temperature control method for liquid-immersed power equipment provided by an embodiment of the present invention;

[0021] Figure 2 : A front view of a liquid-immersed power equipment system provided by an embodiment of the present invention;

[0022] Figure 3 : A top view of a liquid-immersed power equipment system provided by an embodiment of the present invention;

[0023] Figure 4 : A structural diagram of a heat dissipation device provided in an embodiment of the present invention.

[0024] Among them, 10 - circulating pump; 11 - first liquid-immersed power equipment; 12 - second liquid-immersed power equipment; 2 - heat sink; 31 - first upper interface; 32 - second upper interface; 41 - first gas relay; 42 - second gas relay; 51 - upper connecting pipe; 52 - lower connecting pipe; 6 - pipe bracket; 7 - first bellows; 8 - stop valve; 91 - first lower interface; 92 - second lower interface; 201 - heat sink; 202 - interface valve; 203 - oil pump; 204 - fan; DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0026] Example 1:

[0027] like Figure 1 As shown, an embodiment of the present invention provides a temperature control method for liquid-immersed power equipment. The temperature control method for liquid-immersed power equipment is applied to a liquid-immersed power equipment system to control the temperature of the liquid-immersed power equipment.

[0028] like Figure 2 As shown, the liquid-immersed power device system includes a first liquid-immersed power device 11 and at least one second liquid-immersed power device 12 , and the oil tank of the first liquid-immersed power device 11 is connected to the oil tank of the second liquid-immersed power device 12 .

[0029] The first liquid-immersed power device 11 and the second liquid-immersed power device 12 may be power devices such as oil-immersed transformers and reactors that use insulating liquid for heat dissipation.

[0030] For example, the first liquid-immersed electrical device 11 and the second liquid-immersed electrical device 12 can be electrical devices of the same type or different types. Figure 2 and Figure 3As shown, the first liquid-immersed power device 11 and the second liquid-immersed power device 12 are both oil-immersed transformers, and both the first liquid-immersed power device 11 and the second liquid-immersed power device 12 use insulating oil for heat dissipation.

[0031] The number of the second liquid-immersed electrical device 12 can be one, two, or three. In this embodiment, the number of the second liquid-immersed electrical device 12 is one.

[0032] like Figure 1 As shown, the temperature control method for liquid-immersed power equipment includes steps S100-S200.

[0033] S100 , detecting the temperature of the insulating oil in the oil tank of the first liquid-immersed electrical device 11 and the temperature of the insulating oil in the oil tank of the second liquid-immersed electrical device 12 .

[0034] For example, two temperature sensors may be used to detect the temperature of the insulating oil in the oil tank of the first liquid-immersed electrical device 11 and the temperature of the insulating oil in the oil tank of the second liquid-immersed electrical device 12 , respectively.

[0035] S200. If the temperature of the insulating oil in the oil tank of the first liquid-immersed electrical equipment 11 is different from the temperature of the insulating oil in the oil tank of the second liquid-immersed electrical equipment 12, the insulating oil is circulated between the oil tank of the first liquid-immersed electrical equipment 11 and the oil tank of the second liquid-immersed electrical equipment 12 to balance the temperatures of the first liquid-immersed electrical equipment 11 and the second liquid-immersed electrical equipment 12 through the insulating oil.

[0036] In some examples, such as Figure 2 and Figure 3 As shown, the oil tank of the first liquid-immersed power device 11 and the oil tank of the second liquid-immersed power device 12 are connected through a connecting pipe, and a circulation pump 10 is provided on the connecting pipe.

[0037] For example, when there are multiple second liquid-immersed power devices 12 , the connecting pipe may sequentially connect the oil tank of the first liquid-immersed power device 11 and the oil tanks of the multiple second liquid-immersed power devices 12 in series.

[0038] Alternatively, when there are multiple second liquid-immersed power devices 12, the oil tank of the first liquid-immersed power device 11 is connected to the oil tanks of multiple second liquid-immersed power devices 12 through connecting pipes. At this time, the oil tank of the first liquid-immersed power device 11 is directly connected to the oil tank of each second liquid-immersed power device 12.

[0039] When the number of the second liquid-immersed electrical device 12 is one, Figure 2 and Figure 3As shown, the connecting pipeline includes an upper connecting pipeline 51 and a lower connecting pipeline 52. The upper connecting pipeline 51 is located above the lower connecting pipeline 52. The upper connecting pipeline 51 connects the upper part of the oil tank of the first liquid-immersed electric device 11 and the upper part of the oil tank of the second liquid-immersed electric device 12. The lower connecting pipeline 52 connects the lower part of the oil tank of the first liquid-immersed electric device 11 and the lower part of the oil tank of the second liquid-immersed electric device 12, so that the insulating oil can circulate in the upper connecting pipeline 51 and the lower connecting pipeline 52.

[0040] In S200, the insulating oil is circulated between the oil tank of the first liquid-immersed power equipment 11 and the oil tank of the second liquid-immersed power equipment 12, specifically: the circulation pump 10 is started, and the circulation pump 10 drives the insulating oil to circulate between the oil tank of the first liquid-immersed power equipment 11 and the oil tank of the second liquid-immersed power equipment 12.

[0041] For example, the circulation pump 10 may be an existing axial flow pump. After the circulation pump 10 is started, it can drive the insulating oil to circulate between the oil tank of the first liquid-immersed electrical device 11 and the oil tank of the second liquid-immersed electrical device 12 .

[0042] It can be understood that the amount of insulating oil flowing out of the oil tank of the first liquid-immersed power equipment 11 is equal to the amount of insulating oil flowing into the oil tank of the second liquid-immersed power equipment 12; the amount of insulating oil flowing into the oil tank of the first liquid-immersed power equipment 11 is equal to the amount of insulating oil flowing out of the oil tank of the second liquid-immersed power equipment 12.

[0043] In some examples, when the insulating oil circulates between the oil tank of the first liquid-immersed electrical equipment 11 and the oil tank of the second liquid-immersed electrical equipment 12, the amount of insulating oil flowing out of the oil tank of the first liquid-immersed electrical equipment 11 is equal to the amount of insulating oil flowing into the oil tank of the first liquid-immersed electrical equipment 11, so as to ensure the total amount of insulating oil in the oil tank of the first liquid-immersed electrical equipment 11.

[0044] When the insulating oil circulates between the oil tank of the first liquid-immersed electrical equipment 11 and the oil tank of the second liquid-immersed electrical equipment 12, the amount of insulating oil flowing out of the oil tank of the second liquid-immersed electrical equipment 12 is equal to the amount of insulating oil flowing into the oil tank of the second liquid-immersed electrical equipment 12, so as to ensure the total amount of insulating oil in the oil tank of the second liquid-immersed electrical equipment 12.

[0045] For example, the first liquid-immersed power equipment 11 is a high-temperature equipment, and the second liquid-immersed power equipment 12 is a low-temperature equipment (the high temperature and low temperature here are only descriptions of the relative temperature between the first liquid-immersed power equipment 11 and the second liquid-immersed power equipment 12, and do not limit the specific temperature values, the same below).

[0046] For example, the first liquid-immersed power equipment 11 is a device that operates at full load for a long time, and its average temperature rise is 60K. The second liquid-immersed power equipment 12 is a device that is shut down for a long time, and its overall temperature is lower than 5°C when the external ambient temperature is low.

[0047] When the insulating oil circulates between the oil tank of the first liquid-immersed electrical equipment 11 and the oil tank of the second liquid-immersed electrical equipment 12, the insulating oil with a higher temperature in the first liquid-immersed electrical equipment 11 can be brought to the second liquid-immersed electrical equipment 12, so as to heat up the second liquid-immersed electrical equipment 12, thereby avoiding electrical failures that may be caused by the second liquid-immersed electrical equipment 12 being too low in temperature; when the insulating oil circulates between the oil tank of the first liquid-immersed electrical equipment 11 and the oil tank of the second liquid-immersed electrical equipment 12, the insulating oil with a lower temperature in the second liquid-immersed electrical equipment 12 can also be brought to the first liquid-immersed electrical equipment 11 at the same time, so as to cool down the first liquid-immersed electrical equipment 11, thereby avoiding the problem of accelerated aging of the insulating oil due to excessive temperature rise of the first liquid-immersed electrical equipment 11.

[0048] It can be understood that the first liquid-immersed electrical equipment 11 can also be a device with a lower temperature. In this case, the second liquid-immersed electrical equipment 12 is a device with a higher temperature. Through the circulation of insulating oil, the temperature of the first liquid-immersed electrical equipment 11 and the second liquid-immersed electrical equipment 12 can still be balanced, avoiding the first liquid-immersed electrical equipment 11 and the second liquid-immersed electrical equipment 12 from being too high or too low, thereby improving the operating reliability of the liquid-immersed electrical equipment.

[0049] Therefore, the temperature control method for liquid-immersed electrical equipment provided in the embodiment of the present invention can detect the temperature of the insulating oil in the oil tank of the first liquid-immersed electrical equipment 11 and the temperature of the insulating oil in the oil tank of the second liquid-immersed electrical equipment 12. When the temperature of the insulating oil in the oil tank of the first liquid-immersed electrical equipment 11 and the temperature of the insulating oil in the oil tank of the second liquid-immersed electrical equipment 12 are different, the insulating oil can be circulated between the oil tanks of the first liquid-immersed electrical equipment 11 and the second liquid-immersed electrical equipment 12. The insulating oil can drive heat to flow from the high-temperature equipment to the low-temperature equipment to heat the low-temperature equipment, and at the same time, the insulating oil can drive cold to flow from the low-temperature equipment to the high-temperature equipment to cool the high-temperature equipment. In this way, the temperatures of the first liquid-immersed electrical equipment 11 and the second liquid-immersed electrical equipment 12 can be balanced, thereby avoiding electrical faults caused by excessively low temperatures of the liquid-immersed electrical equipment and the problem of accelerated aging of the insulating oil caused by excessive temperature rise of the liquid-immersed electrical equipment, thereby improving the operational reliability of the liquid-immersed electrical equipment.

[0050] In some embodiments, in the above S200, after the insulating oil is circulated between the first liquid-immersed electrical equipment 11 and the second liquid-immersed electrical equipment 12, the liquid-immersed electrical equipment temperature control method further includes: determining whether an insulating oil loss failure occurs in the first liquid-immersed electrical equipment 11 and / or the second liquid-immersed electrical equipment 12; and disconnecting the connecting pipeline when an insulating oil loss failure occurs in the first liquid-immersed electrical equipment 11 and / or the second liquid-immersed electrical equipment 12.

[0051] For example, Figure 2 As shown, the first liquid-immersed power device 11 is provided with a first gas relay 41 , and the second liquid-immersed power device 12 is provided with a second gas relay 42 .

[0052] The structures and working principles of the first gas relay 41 and the second gas relay 42 are both based on the prior art.

[0053] Determine whether the first liquid-immersed power equipment 11 and / or the second liquid-immersed power equipment 12 has an insulating oil loss fault, specifically: determine whether the first liquid-immersed power equipment 11 has an insulating oil loss fault through the first gas relay 41; determine whether the second liquid-immersed power equipment 12 has an insulating oil loss fault through the second gas relay 42.

[0054] It is a conventional technical means in this field to determine whether an insulating oil loss fault occurs in liquid-immersed power equipment by using a gas relay.

[0055] When the first gas relay 41 issues an alarm, it can be determined that the first liquid-immersed power device 11 has an insulating oil loss fault. When the second gas relay 42 issues an alarm, it can be determined that the second liquid-immersed power device 12 has an insulating oil loss fault.

[0056] For example, Figure 2 As shown, both the upper connecting pipeline 51 and the lower connecting pipeline 52 of the connecting pipeline are provided with a shut-off valve 8, and the shut-off valve 8 can be an electrically controlled valve.

[0057] By closing the shut-off valve 8, the connecting pipeline can be disconnected, so that the oil tank of the first liquid-immersed electrical equipment 11 and the oil tank of the second liquid-immersed electrical equipment 12 are no longer connected. When an insulating oil loss failure occurs in one of the first liquid-immersed electrical equipment 11 and the second liquid-immersed electrical equipment 12, the insulating oil in the oil tank of the other will not be affected.

[0058] In some embodiments, in S200, after the insulating oil is circulated between the first liquid-immersed power equipment 11 and the second liquid-immersed power equipment 12, the liquid-immersed power equipment operation method further includes: detecting the insulating oil temperature in the connecting pipeline; when the insulating oil temperature is lower than a preset temperature, turning off the heat dissipation device 2 of the first liquid-immersed power equipment 11 and / or the second liquid-immersed power equipment 12.

[0059] Exemplarily, a method for detecting the temperature of the insulating oil in the connecting pipe may be to provide a temperature sensor on the connecting pipe.

[0060] For example, a temperature sensor is provided on the upper connecting pipe 51 or the lower connecting pipe 52 .

[0061] The preset temperature can be set according to on-site working conditions or production experience.

[0062] For example, when the temperature of liquid-immersed power equipment drops to 5°C, water in the insulating oil of the equipment begins to separate from the insulating paperboard and oil, forming tiny suspended water globules, thereby reducing the insulation performance of the insulation structure of the power equipment. In this case, the preset temperature can be set to greater than 5°C, for example, to 7°C.

[0063] As those skilled in the art will appreciate, the heat dissipation device 2 of the first and second liquid-immersed electrical devices 11, 12 may be a fin-type radiator. The insulating oil in the first and second liquid-immersed electrical devices 11, 12 flows within the heat dissipation device 2 to exchange heat with the external air. A fin-type radiator typically includes a fan and an oil pump. The fan is used to increase the air flow rate around the fin-type radiator, and the oil pump is used to increase the insulating oil flow rate within the fin-type radiator to improve the fin-type radiator's heat dissipation capacity.

[0064] The method for shutting down the heat dissipation device 2 is: shutting down the oil pump of the heat dissipation device 2 and / or shutting down the fan of the heat dissipation device 2 .

[0065] It can be understood that when the external temperature drops rapidly, the heat inside the first liquid-immersed electrical equipment 11 and the second liquid-immersed electrical equipment 12 will be quickly released into the air through the heat dissipation device 2, thereby accelerating the cooling rate of the first liquid-immersed electrical equipment 11 and the second liquid-immersed electrical equipment 12, and may cause the first liquid-immersed electrical equipment 11 and the second liquid-immersed electrical equipment 12 to be cooled to a temperature at which the trace water in the insulating oil begins to separate from the insulating cardboard and the oil (for example, the above-mentioned 5°C).

[0066] After the heat dissipation device 2 is turned off, the speed at which the heat in the first liquid-immersed electrical equipment 11 and the second liquid-immersed electrical equipment 12 is released into the air can be reduced, which is beneficial to the insulation of the first liquid-immersed electrical equipment 11 and the second liquid-immersed electrical equipment 12 in a low-temperature environment, and prevents the first liquid-immersed electrical equipment 11 and the second liquid-immersed electrical equipment 12 from being too low in temperature, causing the water in the insulating oil to separate from the insulating cardboard and the oil to form tiny suspended water balls, thereby affecting the insulating performance of the insulating oil.

[0067] In summary, the temperature control method for liquid-immersed power equipment according to the embodiment of the present invention can achieve the following beneficial effects in actual production:

[0068] When liquid-immersed electrical equipment is stored or on standby at low temperatures, two liquid-immersed electrical equipment are connected through a connecting pipe. The connecting pipe is used to connect the insulating oil of the two liquid-immersed electrical equipment to each other. The high-temperature insulating oil in one operational equipment (liquid-immersed electrical equipment in a working state) is circulated to heat the other out-of-service equipment (liquid-immersed electrical equipment in a shut-down state) as a whole, ensuring that the internal insulation performance of the out-of-service equipment is not affected by the low-temperature environment, thereby avoiding the economic cost and construction impact caused by the replacement or filtration of the insulating oil during the later commissioning.

[0069] When the liquid-immersed power equipment is operating at high temperature, the two liquid-immersed power equipment are connected with a connecting pipe, and the insulating oil of the two connecting pipes is interconnected by the connecting pipe, so that the heat dissipation devices of the two connecting pipes can be shared, thereby improving the overall heat dissipation capacity of the two liquid-immersed power equipment, reducing the operating temperature of the liquid-immersed power equipment, improving the reliability of the operation of the liquid-immersed power equipment, and improving the load capacity of the liquid-immersed power equipment in a high-temperature environment. At the same time, the operating loss of the liquid-immersed power equipment can be reduced due to the reduction in temperature (the reason is that the resistivity of the conductor decreases with the decrease in temperature, and the loss is reduced). Furthermore, the high-load or overload operation mode of one liquid-immersed power equipment can replace the simultaneous operation of two liquid-immersed power equipment, thereby reducing the overall operating costs of multiple liquid-immersed power equipment.

[0070] Example 2:

[0071] The embodiment of the present invention also provides a liquid immersed power equipment system, such as Figure 2 and Figure 3 As shown, the liquid-immersed power device system includes a first liquid-immersed power device 11 , at least one second liquid-immersed power device 12 , a coupling assembly, a controller, and a drive assembly.

[0072] The first and second liquid-immersed electrical devices 11, 12 can be electrical devices that use insulating liquid for heat dissipation, such as oil-immersed transformers and reactors. In this embodiment, the first and second liquid-immersed electrical devices 11, 12 are both oil-immersed transformers, both of which use insulating oil for insulation and heat dissipation.

[0073] The first liquid-immersed electrical device 11 is provided with a first temperature sensor for detecting the temperature of the insulating oil in the oil tank of the first liquid-immersed electrical device 11. At least one second liquid-immersed electrical device 12 is provided with a second temperature sensor for detecting the temperature of the insulating oil in the oil tank of the second liquid-immersed electrical device 12.

[0074] Exemplarily, the temperature probe of the first temperature sensor extends into the oil tank of the first liquid-immersed electrical device 11 , and the temperature probe of the second temperature sensor extends into the oil tank of the second liquid-immersed electrical device 12 .

[0075] The coupling assembly is used to connect the oil tank of the first liquid-immersed electrical device 11 to the oil tank of the second liquid-immersed electrical device 12. A controller is electrically connected to both the first and second temperature sensors and is used to control the drive assembly based on the temperature of the insulating oil in the oil tanks of the first and second liquid-immersed electrical devices 11, 12. The drive assembly is mounted on the coupling assembly and, under the control of the controller, circulates insulating oil between the oil tanks of the first and second liquid-immersed electrical devices 11, 12 to balance the temperatures of the first and second liquid-immersed electrical devices 11, 12.

[0076] For example, the coupling assembly may include a pipeline, and the oil tank of the first liquid-immersed electrical device 11 and the oil tank of the second liquid-immersed electrical device 12 are connected to each other through the pipeline.

[0077] For example, the controller may be a general programmable logic controller, such as a programmable logic controller model S7-200 produced by Siemens.

[0078] Exemplarily, when the controller receives information that the temperature of the insulating oil in the oil tank of the first liquid-immersed electrical equipment 11 is different from the temperature of the insulating oil in the oil tank of the second liquid-immersed electrical equipment 12, that is, when the temperature of one of the first liquid-immersed electrical equipment 11 and the second liquid-immersed electrical equipment 12 is lower than the temperature of the other, the controller controls the drive component to drive the insulating oil to circulate between the oil tank of the first liquid-immersed electrical equipment 11 and the oil tank of the second liquid-immersed electrical equipment 12.

[0079] Through the above-mentioned arrangement, the insulating oil can be controlled to circulate between the oil tank of the first liquid-immersed electric equipment 11 and the oil tank of the second liquid-immersed electric equipment 12 according to the temperature of the insulating oil in the oil tank of the first liquid-immersed electric equipment 11 and the temperature of the insulating oil in the oil tank of the second liquid-immersed electric equipment 12, so that the insulating oil drives heat to flow from the high-temperature equipment (for example, the first liquid-immersed electric equipment 11) to the low-temperature equipment (for example, the second liquid-immersed electric equipment 12) to heat the low-temperature equipment, and at the same time drives cold to flow from the low-temperature equipment to the high-temperature equipment to cool the high-temperature equipment, thereby balancing the temperatures of the first liquid-immersed electric equipment 11 and the second liquid-immersed electric equipment 12, avoiding electrical failures caused by too low a temperature of the liquid-immersed electric equipment, and avoiding the problem of accelerated aging of the insulating oil caused by too high a temperature rise of the liquid-immersed electric equipment.

[0080] In some examples, such as Figure 2 and Figure 3 As shown, the coupling assembly includes a coupling pipe. The coupling pipe connects the oil tank of the first liquid-immersed electrical device 11 and the oil tank of the second liquid-immersed electrical device 12, and is used to circulate insulating oil between the oil tanks of the first liquid-immersed electrical device 11 and the second liquid-immersed electrical device 12. The drive assembly includes a circulation pump 10. The circulation pump 10 is disposed on the coupling pipe and is electrically connected to the circulation pump 10. The circulation pump 10 is used to drive the insulating oil in the coupling pipe under the control of a controller.

[0081] For example, the number of the second liquid-immersed electrical devices 12 may be one, two, or three. In this embodiment, the number of the second liquid-immersed electrical devices 12 is one.

[0082] When there are multiple second liquid-immersed power devices 12 , the connecting pipe may sequentially connect the oil tank of the first liquid-immersed power device 11 and the oil tanks of the multiple second liquid-immersed power devices 12 in series.

[0083] Alternatively, when there are multiple second liquid-immersed power devices 12, the oil tank of the first liquid-immersed power device 11 is connected to the oil tanks of multiple second liquid-immersed power devices 12 through connecting pipes. At this time, the oil tank of the first liquid-immersed power device 11 is directly connected to the oil tank of each second liquid-immersed power device 12.

[0084] When the number of the second liquid-immersed electrical device 12 is one, a connecting pipe is provided between the oil tank of the first liquid-immersed electrical device 11 and the oil tank of the second liquid-immersed electrical device 12 to connect the oil tank of the first liquid-immersed electrical device 11 and the oil tank of the second liquid-immersed electrical device 12 .

[0085] For example, the circulation pump 10 may be a general axial flow pump.

[0086] Through the above arrangement, the flow of the insulating oil can be controlled by the circulation pump 10 .

[0087] In some embodiments, as Figure 2 and Figure 3 As shown, the oil tank of the first liquid-immersed power device 11 is provided with a first upper port 31 and a first lower port 91, while the oil tank of the second liquid-immersed power device 12 is provided with a second upper port 32 and a second lower port 92. The connecting pipes include an upper connecting line 51 and a lower connecting line 52. The upper connecting line 51 connects the first upper port 31 and the second upper port 32, while the lower connecting line 52 connects the first lower port 91 and the second lower port 92. The circulating pump 10 is provided on the lower connecting line 52.

[0088] Through the above arrangement, the insulating oil in the first liquid-immersed power device 11 and the second liquid-immersed power device 12 can circulate between the oil tank of the first liquid-immersed power device 11 and the oil tank of the second liquid-immersed power device 12 through the upper connecting pipe 51 and the lower connecting pipe 52.

[0089] It can be understood that the amount of insulating oil flowing out of the oil tank of the first liquid-immersed power equipment 11 is equal to the amount of insulating oil flowing into the oil tank of the second liquid-immersed power equipment 12; the amount of insulating oil flowing into the oil tank of the first liquid-immersed power equipment 11 is equal to the amount of insulating oil flowing out of the oil tank of the second liquid-immersed power equipment 12.

[0090] In some examples, when the insulating oil circulates between the oil tank of the first liquid-immersed electrical equipment 11 and the oil tank of the second liquid-immersed electrical equipment 12, the amount of insulating oil flowing out of the oil tank of the first liquid-immersed electrical equipment 11 is equal to the amount of insulating oil flowing into the oil tank of the first liquid-immersed electrical equipment 11, so as to ensure the total amount of insulating oil in the oil tank of the first liquid-immersed electrical equipment 11.

[0091] When the insulating oil circulates between the oil tank of the first liquid-immersed electrical equipment 11 and the oil tank of the second liquid-immersed electrical equipment 12, the amount of insulating oil flowing out of the oil tank of the second liquid-immersed electrical equipment 12 is equal to the amount of insulating oil flowing into the oil tank of the second liquid-immersed electrical equipment 12, so as to ensure the total amount of insulating oil in the oil tank of the second liquid-immersed electrical equipment 12.

[0092] In some examples, such as Figure 2 As shown, the upper connecting pipe 51 and the lower connecting pipe 52 are both fixed on a reference surface (such as the ground) through a pipe support 6, so as to support the upper connecting pipe 51 and the lower connecting pipe 52 through the pipe support 6. The pipe support 6 can be an ordinary steel frame.

[0093] In some examples, such as Figure 2As shown, the upper connecting pipeline 51 is composed of two sections of first sub-pipes, which are connected through the first bellows 7. The lower connecting pipeline 52 is composed of two sections of second sub-pipes, which are connected through the second bellows.

[0094] Exemplarily, the circulation pump 10 is provided on any second sub-pipeline.

[0095] The first bellows 7 and the second bellows can be deformed, thereby reducing the difficulty of positioning and installing the upper connecting pipe 51 and the lower connecting pipe 52 and increasing the reliability of the upper connecting pipe 51 and the lower connecting pipe 52 when subjected to vibration.

[0096] In some embodiments, as Figure 2 and Figure 3 As shown, the first liquid-immersed power device 11 and the second liquid-immersed power device 12 both include a heat dissipation device 2, such as Figure 4 As shown, the heat dissipation device 2 includes a heat sink 201 , a fan 204 and an oil pump 203 .

[0097] Exemplarily, the heat sink 201 is used to allow insulating oil to flow through so that the insulating oil can exchange heat with the external air, the fan 204 is used to increase the air flow rate around the heat sink 201, and the oil pump 203 is used to increase the insulating oil flow rate in the heat sink 201 to improve the heat dissipation capacity of the heat sink 2.

[0098] The controller is also electrically connected to the fan 204 and the oil pump 203 on the heat dissipation device 2 of the first liquid-immersed power equipment 11 and the second liquid-immersed power equipment 12, and is also used to control the fan 204 of the heat dissipation device 2 of the first liquid-immersed power equipment 11 and the second liquid-immersed power equipment 12 according to the temperature of the insulating oil in the oil tank of the first liquid-immersed power equipment 11 and the temperature of the insulating oil in the oil tank of the second liquid-immersed power equipment 12, and to control the oil pump 203 of the heat dissipation device 2 of the first liquid-immersed power equipment 11 and the second liquid-immersed power equipment 12.

[0099] For example, the controller may control the opening and closing of one or more of the fan 204 and the oil pump 203 on the heat dissipation device 2 of the first liquid-immersed electric device 11 and the second liquid-immersed electric device 12 .

[0100] Turning off the fan 204 on the heat sink 2 can reduce the air flow rate around the heat sink 201, and turning off the oil pump 203 can reduce the flow rate of the insulating oil in the heat sink 201, thereby reducing the heat dissipation speed of the insulating oil when flowing through the heat sink 2, which is beneficial to the insulation of the insulating oil.

[0101] For example, when the insulating oil temperature in the connecting pipe is lower than a preset temperature (e.g., 5°C), indicating that the insulating oil temperature is currently low, trace amounts of water in the insulating oil are about to separate from the insulating paperboard and the oil. At this point, the controller can shut down the fan 204 of the heat dissipation device 2 of the first liquid-immersed electrical device 11 and / or the second liquid-immersed electrical device 12, and / or shut down the oil pump 203 of the heat dissipation device 2 of the first liquid-immersed electrical device 11 and / or the second liquid-immersed electrical device 12.

[0102] By turning off the fan 204 of the heat dissipation device 2 of the first liquid-immersed electrical device 11 and / or the second liquid-immersed electrical device 12, and / or turning off the oil pump 203 of the heat dissipation device 2 of the first liquid-immersed electrical device 11 and / or the second liquid-immersed electrical device 12, further heat loss in the insulating oil in the first liquid-immersed electrical device 11 and the second liquid-immersed electrical device 12 can be avoided, and further decrease in the insulating oil temperature can be avoided, which may cause the separation of trace water in the insulating oil from the insulating cardboard and the oil.

[0103] In some examples, such as Figure 4 As shown, the heat dissipation device 2 also includes an interface valve 202, which is used to disconnect the insulating oil in the heat dissipation device 2 from the insulating oil in the oil tank of the corresponding first liquid-immersed electrical equipment 11 or the second liquid-immersed electrical equipment 12, so that the insulating oil in the oil tank of the first liquid-immersed electrical equipment 11 or the second liquid-immersed electrical equipment 12 is no longer dissipated through the heat dissipation device 2, further avoiding the loss of heat in the insulating oil in the first liquid-immersed electrical equipment 11 and the second liquid-immersed electrical equipment 12, and is also beneficial to the insulation of the insulating oil in the oil tank of the first liquid-immersed electrical equipment 11 or the second liquid-immersed electrical equipment 12.

[0104] In some embodiments, the liquid-immersed electrical equipment system further includes an alarm assembly and a shutoff valve 8. The alarm assembly includes a first gas relay 41 and a second gas relay 42. The first gas relay 41 is provided on the first liquid-immersed electrical equipment 11 and is configured to issue a first alarm signal when insulating oil in the first liquid-immersed electrical equipment 11 is lost. The second gas relay 42 is provided on the second liquid-immersed electrical equipment 12 and is configured to issue a second alarm signal when insulating oil in the second liquid-immersed electrical equipment 12 is lost. The shutoff valve 8 is provided on the connecting pipe and is electrically connected to the controller.

[0105] The structures and working principles of the first gas relay 41 and the second gas relay 42 are both prior art. The shut-off valve 8 can be an existing electric control valve.

[0106] For example, there may be two shut-off valves 8 , which are respectively provided on the upper connecting pipeline 51 and the lower connecting pipeline 52 of the connecting pipeline.

[0107] The controller is also electrically connected to the first gas relay 41, the second gas relay 42 and the shut-off valve 8, and is also used to determine whether the first liquid-immersed power equipment 11 has failed when the first alarm signal is received, determine whether the second liquid-immersed power equipment 12 has failed when the second alarm signal is received, and control the shut-off valve 8 to disconnect to disconnect the connecting pipeline when it is determined that the first liquid-immersed power equipment 11 and / or the second liquid-immersed power equipment 12 has failed.

[0108] For example, when the insulating oil inside the first liquid-immersed electrical equipment 11 is lost due to damage, the first gas relay 41 sends a first alarm signal. After receiving the first alarm signal, the controller determines that the first liquid-immersed electrical equipment 11 has failed; at this time, the controller sends a shutdown signal to the shut-off valve 8, controlling the shut-off valve 8 to disconnect, thereby disconnecting the connecting pipeline, so that the oil tank of the first liquid-immersed electrical equipment 11 and the oil tank of the second liquid-immersed electrical equipment 12 are no longer connected, and the insulating oil in the second liquid-immersed electrical equipment 12 no longer flows through the connecting pipeline to the first liquid-immersed electrical equipment 11, thereby preventing the insulating oil in the second liquid-immersed electrical equipment 12 from continuing to lose from the damaged part of the first liquid-immersed electrical equipment 11, and avoiding the damage of the first liquid-immersed electrical equipment 11 from affecting the insulating oil in the oil tank of the second liquid-immersed electrical equipment 12.

[0109] Similarly, when the second liquid-immersed electrical equipment 12 is damaged and the insulating oil inside it is lost, by disconnecting the connecting pipe, the insulating oil in the first liquid-immersed electrical equipment 11 can be prevented from continuing to lose from the damaged part of the second liquid-immersed electrical equipment 12, thereby avoiding the impact of the damage of the second liquid-immersed electrical equipment 12 on the insulating oil in the oil tank of the first liquid-immersed electrical equipment 11.

[0110] Through the above-mentioned setting, the insulating oil loss fault of the first liquid-immersed power equipment 11 and the second liquid-immersed power equipment 12 can be detected, and the connecting pipeline can be disconnected when the fault is detected, so as to avoid the insulating oil loss fault of one of the first liquid-immersed power equipment 11 and the second liquid-immersed power equipment 12 from affecting the other, thereby improving the reliability of the liquid-immersed power equipment system.

[0111] It will be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A temperature control method for liquid-immersed power equipment, applied to a liquid-immersed power equipment system, characterized in that: The liquid-immersed power equipment system comprises a first liquid-immersed power equipment (11) and at least one second liquid-immersed power equipment (12), wherein the oil tank of the first liquid-immersed power equipment (11) is connected to the oil tank of the second liquid-immersed power equipment (12); The temperature control method for liquid-immersed power equipment includes: detecting the temperature of the insulating oil in the oil tank of the first liquid-immersed electric device (11) and the temperature of the insulating oil in the oil tank of the second liquid-immersed electric device (12); If the temperature of the insulating oil in the oil tank of the first liquid-immersed electrical device (11) is different from the temperature of the insulating oil in the oil tank of the second liquid-immersed electrical device (12), the insulating oil is circulated between the oil tank of the first liquid-immersed electrical device (11) and the oil tank of the second liquid-immersed electrical device (12) to balance the temperatures of the first liquid-immersed electrical device (11) and the second liquid-immersed electrical device (12) through the insulating oil.

2. The temperature control method for liquid-immersed power equipment according to claim 1, characterized in that: The oil tank of the first liquid-immersed electric device (11) and the oil tank of the second liquid-immersed electric device (12) are connected via a connecting pipe, and a circulating pump (10) is provided on the connecting pipe; The step of circulating the insulating oil between the oil tank of the first liquid-immersed electric device (11) and the oil tank of the second liquid-immersed electric device (12) is specifically as follows: The circulation pump (10) is started, and the circulation pump (10) drives the insulating oil to circulate between the oil tank of the first liquid-immersed electric device (11) and the oil tank of the second liquid-immersed electric device (12).

3. The temperature control method for liquid-immersed power equipment according to claim 2, characterized in that: After circulating the insulating oil between the first liquid-immersed electrical device (11) and the second liquid-immersed electrical device (12), the method further comprises: Determining whether an insulating oil loss fault occurs in the first liquid-immersed electric device (11) and / or the second liquid-immersed electric device (12); When an insulating oil loss failure occurs in the first liquid-immersed electric device (11) and / or the second liquid-immersed electric device (12), the connecting pipe is disconnected.

4. The temperature control method for liquid-immersed power equipment according to claim 2, characterized in that: After circulating the insulating oil between the first liquid-immersed electrical equipment (11) and the second liquid-immersed electrical equipment (12), the method further comprises: detecting the temperature of the insulating oil in the connecting pipe; When the temperature of the insulating oil is lower than a preset temperature, the heat dissipation device (2) of the first liquid-immersed electric device (11) and / or the second liquid-immersed electric device (12) is turned off.

5. A liquid-immersed power equipment system, characterized in that: include: A first liquid-immersed electric device (11), wherein the first liquid-immersed electric device (11) is provided with a first temperature sensor, and the first temperature sensor is used to detect the temperature of insulating oil in an oil tank of the first liquid-immersed electric device (11); at least one second liquid-immersed electrical device (12), wherein the second liquid-immersed electrical device (12) is provided with a second temperature sensor, and the second temperature sensor is used to detect the temperature of insulating oil in an oil tank of the second liquid-immersed electrical device (12); A coupling assembly for connecting the oil tank of the first liquid-immersed electric device (11) and the oil tank of the second liquid-immersed electric device (12); a controller electrically connected to the first temperature sensor and the second temperature sensor, for controlling the drive assembly according to the temperature of the insulating oil in the oil tank of the first liquid-immersed power device (11) and the temperature of the insulating oil in the oil tank of the second liquid-immersed power device (12); and A drive assembly is provided on the coupling assembly and is used to circulate insulating oil between the oil tank of the first liquid-immersed electrical device (11) and the oil tank of the second liquid-immersed electrical device (12) under the control of the controller, so as to balance the temperatures of the first liquid-immersed electrical device (11) and the second liquid-immersed electrical device (12) through the insulating oil.

6. The liquid-immersed power equipment system according to claim 5, characterized in that: The coupling assembly includes a coupling pipe, the coupling pipe being connected to the oil tank of the first liquid-immersed electric device (11) and the oil tank of the second liquid-immersed electric device (12), and being used for circulating insulating oil between the oil tank of the first liquid-immersed electric device (11) and the oil tank of the second liquid-immersed electric device (12); and, The driving component comprises a circulation pump (10), which is arranged on the connecting pipe and electrically connected to the controller, and is used for driving the insulating oil in the connecting pipe to flow under the control of the controller.

7. The liquid-immersed power equipment system according to claim 6, characterized in that: The first liquid-immersed power device (11) and the second liquid-immersed power device (12) both comprise a heat dissipation device (2), wherein the heat dissipation device (2) comprises a heat sink (201), a fan (204), and an oil pump (203); The controller is also electrically connected to the fans (204) and oil pumps (203) on the heat dissipation devices (2) of the first liquid-immersed electric device (11) and the second liquid-immersed electric device (12), and is further used to control the fans (204) of the heat dissipation devices (2) of the first liquid-immersed electric device (11) and the second liquid-immersed electric device (12) according to the temperature of the insulating oil in the oil tank of the first liquid-immersed electric device (11) and the temperature of the insulating oil in the oil tank of the second liquid-immersed electric device (12), and to control the oil pumps (203) of the heat dissipation devices (2) of the first liquid-immersed electric device (11) and the second liquid-immersed electric device (12).

8. The liquid-immersed power equipment system according to claim 7, characterized in that: Also includes: An alarm component comprises a first gas relay (41) and a second gas relay (42); the first gas relay (41) is arranged on the first liquid-immersed power device (11) and is used to send a first alarm signal when the insulating oil in the first liquid-immersed power device (11) is lost; the second gas relay (42) is arranged on the second liquid-immersed power device (12) and is used to send a second alarm signal when the insulating oil in the second liquid-immersed power device (12) is lost; and, a shutoff valve (8), arranged on the connecting pipe and electrically connected to the controller; The controller is also electrically connected to the first gas relay (41), the second gas relay (42) and the shut-off valve (8), and is further used to determine whether the first liquid-immersed electrical device (11) has failed when the first alarm signal is received, determine whether the second liquid-immersed electrical device (12) has failed when the second alarm signal is received, and control the shut-off valve (8) to disconnect so as to disconnect the connecting pipeline when it is determined that the first liquid-immersed electrical device (11) and / or the second liquid-immersed electrical device (12) has failed.

9. The liquid-immersed power equipment system according to claim 6, characterized in that: The oil tank of the first liquid-immersed electric device (11) is provided with a first upper interface (31) and a first lower interface (91), and the oil tank of the second liquid-immersed electric device (12) is provided with a second upper interface (32) and a second lower interface (92); The connecting pipeline comprises: an upper connecting pipe (51) communicating with the first upper interface (31) and the second upper interface (32); and A lower connecting pipeline (52) communicating with the first lower interface (91) and the second lower interface (92); The circulation pump (10) is arranged on the lower connecting pipeline (52).

10. The liquid-immersed power equipment system according to claim 9, characterized in that: The upper connecting pipeline (51) is composed of two sections of first sub-pipelines, which are connected via a first bellows (7); the lower connecting pipeline (52) is composed of two sections of second sub-pipelines, which are connected via a second bellows.

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