CN111243831A - Transformer with flexible cooling device and control method thereof - Google Patents
Transformer with flexible cooling device and control method thereof Download PDFInfo
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- CN111243831A CN111243831A CN202010239100.5A CN202010239100A CN111243831A CN 111243831 A CN111243831 A CN 111243831A CN 202010239100 A CN202010239100 A CN 202010239100A CN 111243831 A CN111243831 A CN 111243831A
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- transformer
- flexible cooling
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- cooling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/105—Cooling by special liquid or by liquid of particular composition
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Abstract
The invention relates to a transformer with a flexible cooling device and a control method thereof, the transformer comprises a transformer main body and the flexible cooling device, the transformer main body comprises a shell, an iron core and a winding which are arranged in the shell, and a radiator which is arranged on the shell, and transformer oil circularly flowing between the shell and the radiator, the flexible cooling device comprises a flexible cooling bag set and a cooling liquid circulating system, the flexible cooling bag set is formed by connecting a plurality of flexible cooling bags in series and in parallel, and the flexible cooling bags are internally filled with circulating flowing cooling liquid, each flexible cooling bag of the flexible cooling bag group is attached and arranged on the heat exchange wall surface of the radiator, the cooling liquid circulating system is connected with the flexible cooling bag group through a communicating pipeline, so as to drive the cooling liquid to circularly flow between each flexible cooling bag and the cooling liquid circulating system, and continuously cool the transformer oil. The transformer and the control method thereof not only have good cooling effect, but also have safe and reliable operation.
Description
Technical Field
The invention relates to the technical field of transformer cooling, in particular to a transformer with a flexible cooling device and a control method thereof.
Background
The cooling equipment of the traditional transformer mainly comprises: 1) naturally cooling by air; 2) forced air cooling; 3) cooling by strong oil and strong wind; 4) the jacket is water-cooled. In the first three cooling modes, because the air enthalpy is low, and in summer, the air temperature of the whole atmospheric environment is high, the cooling effect is poor, the efficiency is low, and the safety production of the transformer is ensured by reducing the working load of the transformer and reducing the heat productivity when the oil temperature is high. Although the fourth jacket water cooling mode is good in effect, pressure flowing water in the jacket directly contacts with the wall of the transformer, when leakage such as welding seams, cracks, corrosion, bruising and the like occurs in case, water can leak into the transformer, even if a small amount of water leaks into the transformer in a high-voltage high-electric-field transformer, the insulation of the transformer can be greatly damaged, serious accidents can be caused, even malignant consequences of burning and explosion of a large transformer can be caused, and therefore all domestic transformer stations do not use the transformer in the jacket water cooling mode at present, and most of the transformer in the jacket water cooling mode are cooled by using air media.
Disclosure of Invention
The invention aims to provide a transformer with a flexible cooling device and a control method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a transformer with flexible cooling device, includes transformer main part and flexible cooling device, transformer main part includes the casing, installs iron core and winding in the casing, installs the radiator on the casing to and the transformer oil of circulation flow between casing and radiator, flexible cooling device includes flexible cooling bag group and coolant liquid circulation system, flexible cooling bag group comprises a plurality of flexible cooling bag series-parallel connection, and flexible cooling bag expert has the circulation flow coolant liquid, the attached installation of each flexible cooling bag of flexible cooling bag group is on the heat transfer wall of radiator, coolant liquid circulation system is through intercommunication pipeline and flexible cooling bag group link to drive the coolant liquid circulation flow between each flexible cooling bag and coolant liquid circulation system, constantly cool off transformer oil.
Further, the flexible cooling bag is made of flexible carbon fiber materials with heat conduction performance, and the cooling liquid is frozen brine.
Furthermore, the flexible cooling bag of the flexible cooling bag set is attached to the transformer shell and other components to be cooled.
Furthermore, the cooling liquid circulating system comprises a variable frequency circulating pump, a refrigerating device, an electromagnetic valve, a liquid inlet pipe and a liquid outlet pipe, the outlet of the variable frequency circulating pump is connected with the inlet of a first electromagnetic valve, the outlet of the first electromagnetic valve is connected with a liquid inlet pipe, and is connected with the flexible cooling bag set through a liquid inlet pipe, the flexible cooling bags of the flexible cooling bag set are connected in series or in parallel through connecting pipes so as to enable cooling liquid flowing in from the liquid inlet pipe to flow among the flexible cooling bags, then the liquid flows to a liquid outlet pipe connected with the flexible cooling bag group, the liquid outlet pipe is connected with an inlet of a refrigerating device through a second electromagnetic valve, so as to cool the cooling liquid flowing out of the flexible cooling bag group, the outlet of the refrigerating device is connected with the inlet of the variable-frequency circulating pump, the cooled cooling liquid is driven to flow into the flexible cooling bag set through the variable frequency circulating pump, so that the cooling liquid circularly flows between each flexible cooling bag and the cooling liquid circulating system.
Further, the temperature monitoring device comprises a control module and a temperature sensor, wherein the temperature sensor is installed on the transformer main body and is electrically connected with the input end of the control module so as to monitor the temperature of the transformer oil in the transformer in real time and transmit temperature measurement data to the control module, and the output end of the control module is electrically connected with the control ends of the variable frequency circulating pump, the refrigerating device, the first electromagnetic valve and the second electromagnetic valve so as to control the variable frequency circulating pump, the refrigerating device, the first electromagnetic valve and the second electromagnetic valve to work respectively.
Furthermore, the control module automatically controls the starting, stopping and output of the refrigerating device and the variable frequency circulating pump according to the oil temperature of the transformer and the main transformer load, and controls the opening and closing of the first electromagnetic valve and the second electromagnetic valve.
The invention also provides a control method of the transformer with the flexible cooling device, which comprises the following steps:
1) attaching and installing flexible cooling bags on a radiator of the transformer, and forming flexible cooling bag groups by the flexible cooling bags and connecting the flexible cooling bag groups with a cooling liquid circulating system; according to the running state of the transformer, a control program for automatically controlling the starting and stopping of the refrigerating device and the variable frequency circulating pump and controlling the opening and closing of the first electromagnetic valve and the second electromagnetic valve according to the oil temperature of the transformer and the main transformer load is preset in the control module;
2) when the temperature sensor detects that the oil temperature of the transformer reaches a first set value, the control module controls the first electromagnetic valve and the second electromagnetic valve to be opened, then controls the refrigeration device and the variable-frequency circulating pump to be started, and the flexible cooling device starts to operate;
3) when the load of the transformer is continuously increased and the temperature of the transformer oil is continuously increased to a second set value, the control module controls the refrigerating device and the variable-frequency circulating pump to increase the output, and the output is correspondingly increased along with the continuous increase of the temperature of the transformer oil and the load of the transformer, so that the cooling effect is achieved, and the safe operation of the transformer is ensured;
4) when the load of the transformer is reduced and the oil temperature of the transformer is reduced, the control module controls the refrigerating device and the variable-frequency circulating pump to reduce the output, and the output is correspondingly reduced along with the continuous reduction of the oil temperature and the load of the transformer, so that the matching is reasonably optimized and the energy consumption is saved;
5) when the temperature sensor detects that the temperature of the transformer oil drops to a third set value, the control module controls the refrigeration device and the variable-frequency circulating pump to stop working, then controls the first electromagnetic valve and the second electromagnetic valve to be closed, and the flexible cooling device stops running.
Compared with the prior art, the invention has the following beneficial effects:
1) the flexible cooling bag with good strength, toughness, flexibility and thermal conductivity is attached to the heat exchange wall surface of the transformer heat exchanger, so that the flexible cooling bag is well attached to the complex shape of the wall surface of the heat exchanger, and the effective cooling area is greatly increased.
2) Through filling the coolant liquid that has advantages such as the enthalpy volume is big, the cooling temperature is low in freezing salt solution etc. in flexible cooling bag, greatly improved cooling efficiency.
3) The coolant liquid fills and annotates in flexible cooling bag, does not directly contact with heat exchanger heat transfer wall, consequently, even the transformer takes place the seepage, can not cause the inside seepage of coolant liquid toward the transformer yet, has improved the security and the reliability of device operation greatly.
Drawings
FIG. 1 is a schematic diagram of an oil-cooled winding and an iron core of a transformer according to an embodiment of the present invention.
Fig. 2 is a schematic front view of a transformer with a heat sink mounted therein in an embodiment of the present invention.
Fig. 3 is a schematic side view of a heat sink mounted transformer in an embodiment of the present invention.
Fig. 4 is a schematic diagram of the operation of the apparatus according to the embodiment of the present invention.
Figure 5 is a schematic view of the flow of chilled saline in a flexible cooling bag in an embodiment of the present invention.
Fig. 6 is a control schematic diagram of an apparatus according to an embodiment of the present invention.
In the figure: 1-a transformer housing; 2-iron core; 3-winding; 4-transformer oil; 5-sleeving a pipe; 6-temperature sensor; 7-a radiator; 8-flexible cooling bags; 9-a liquid inlet pipe; 10-a liquid outlet pipe; 11-a first solenoid valve; 12-a second solenoid valve; 13-a refrigeration device; 14-variable frequency circulating pump.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
The invention provides a transformer with a flexible cooling device, which comprises a transformer main body and the flexible cooling device, wherein the transformer main body comprises a shell 1, an iron core 2, a winding 3 and related components which are arranged in the shell 1, a radiator 7 arranged on the shell 1, and transformer oil 4 which circulates between the shell 1 and the radiator 7. The flexible cooling device comprises a flexible cooling bag set and a cooling liquid circulating system, the flexible cooling bag set is formed by connecting a plurality of flexible cooling bags 8 in series and in parallel, circulating flowing cooling liquid is introduced into the flexible cooling bags 8, and the flexible cooling bags 8 of the flexible cooling bag set are attached to the heat exchange wall surface of the radiator 7. If necessary, the flexible cooling bag of the flexible cooling bag set is also attached and mounted on the transformer shell and other parts needing cooling. The cooling liquid circulating system is connected with the flexible cooling bag set through the communicating pipeline so as to drive cooling liquid to circularly flow between each flexible cooling bag and the cooling liquid circulating system, and the transformer oil is continuously cooled.
In this embodiment, the flexible cooling bag is made of a flexible carbon fiber material (or other suitable material with high strength, high toughness, and good softness and thermal conductivity) having thermal conductivity, and the cooling fluid is chilled brine (or other suitable circulating cooling medium).
In this embodiment, the cooling liquid circulation system includes a variable frequency circulation pump 14, a refrigeration device 13, a first electromagnetic valve 11, a second electromagnetic valve 12, a liquid inlet pipe 9, and a liquid outlet pipe 10. The outlet of the variable frequency circulating pump 14 is connected with the inlet of the first electromagnetic valve 11, the outlet of the first electromagnetic valve 11 is connected with the liquid inlet pipe 9 and is connected with the flexible cooling bag set through the liquid inlet pipe 9, the flexible cooling bags 8 of the flexible cooling bag set are connected in series or in parallel through the connecting pipes, so that cooling liquid flowing in from the liquid inlet pipe 9 flows among the flexible cooling bags 8 and then flows together to the liquid outlet pipe 10 connected with the flexible cooling bag set, the liquid outlet pipe 10 is connected with the inlet of the refrigerating device 13 through the second electromagnetic valve 12 to cool the cooling liquid flowing out from the flexible cooling bag set, the outlet of the refrigerating device 13 is connected with the inlet of the variable frequency circulating pump 14, so that the cooling liquid driven by the variable frequency circulating pump 14 flows into the flexible cooling bag set, and the cooling liquid circularly flows between the flexible cooling bags and the cooling liquid circulating system.
As shown in fig. 6, in order to realize the automatic control of the cooling of the transformer, the transformer further comprises a control module and a temperature sensor 6, wherein the temperature sensor 6 is installed on the transformer main body and is electrically connected with the input end of the control module so as to monitor the temperature of the transformer oil in the transformer in real time and transmit temperature measurement data to the control module. The output end of the control module is respectively and electrically connected with the control ends of the variable frequency circulating pump 14, the refrigerating device 13, the first electromagnetic valve 11 and the second electromagnetic valve 12 so as to respectively control the variable frequency circulating pump, the refrigerating device, the first electromagnetic valve and the second electromagnetic valve to work. The control module automatically controls the starting and stopping of the refrigerating device and the variable frequency circulating pump and the output of the variable frequency circulating pump according to the oil temperature of the transformer and the load of the main transformer, and controls the opening and closing of the first electromagnetic valve and the second electromagnetic valve.
The invention also provides a control method of the transformer with the flexible cooling device, which specifically comprises the following steps:
1) attaching and installing a flexible cooling bag on a radiator of the transformer; if necessary, a flexible cooling bag is also arranged on the transformer shell and other components needing cooling; and then all the flexible cooling bags form a flexible cooling bag group and are connected with a cooling liquid circulating system. According to the running state of the transformer, a control program for automatically controlling the starting and stopping of the refrigerating device and the variable frequency circulating pump and controlling the opening and closing of the first electromagnetic valve and the second electromagnetic valve according to the oil temperature of the transformer and the main transformer load is preset in the control module.
2) When the temperature sensor detects that the oil temperature of the transformer reaches a first set value, the control module controls the first electromagnetic valve and the second electromagnetic valve to be opened, then controls the refrigeration device and the variable-frequency circulating pump to be started, and the flexible cooling device starts to operate.
3) When the load of the transformer is continuously increased and the temperature of the transformer oil is continuously increased to a second set value, the control module controls the refrigerating device and the variable-frequency circulating pump to increase the output power, and the output power is correspondingly increased along with the continuous increase of the temperature of the transformer oil and the load of the transformer, so that the cooling effect is achieved, and the safe operation of the transformer is ensured.
4) When the load of the transformer is reduced and the oil temperature of the transformer is reduced, the control module controls the refrigerating device and the variable-frequency circulating pump to reduce the output, and the output is correspondingly reduced along with the continuous reduction of the oil temperature and the load of the transformer, so that the matching is reasonably optimized, and the energy consumption is saved.
5) When the temperature sensor detects that the temperature of the transformer oil drops to a third set value, the control module controls the refrigeration device and the variable-frequency circulating pump to stop working, then controls the first electromagnetic valve and the second electromagnetic valve to be closed, and the flexible cooling device stops running.
The windings and iron cores inside the transformer can generate a large amount of heat in operation due to the action of current and magnetic field, and the heat needs to be taken away by transformer oil which flows circularly. In the prior art, transformer oil which takes away heat flows into a radiator arranged on a transformer shell and is cooled by outside air, and the cooled transformer oil flows back into the transformer to cool a winding and an iron core, so that the transformer oil is circulated continuously to achieve the purpose of cooling. The invention uses the continuously circulating frozen brine to replace the external air to more efficiently cool the transformer oil. The freezing salt water fills and fills in flexible cooling bag, each flexible cooling bag closely attaches on the transformer casing, on the outer wall of radiator and relevant part, connect by the connecting pipe between each cooling bag, a plurality of flexible cooling bags are connected in series and parallelly into flexible cooling bag group, install feed liquor pipe and drain pipe on the flexible cooling bag group, install first solenoid valve between feed liquor pipe and variable frequency circulating pump, install the second solenoid valve between liquid outlet main and variable frequency refrigerating plant import, the feed liquor pipe is connected in the one end of first solenoid valve, the other end of first solenoid valve is connected in the one end of variable frequency circulating pump, the other end of variable frequency circulating pump is connected the export of refrigerating plant, the one end of second solenoid valve is connected in refrigerating plant's import, the drain pipe of flexible cooling bag is connected to the other end of second solenoid valve, freezing salt water in the flexible cooling bag carries out the cold to transformer oil through hugging closely the carbon fiber bag body that covers in radiator, transformer And the transformer oil is used for cooling the winding and the iron core, the frozen brine heated by heat exchange in the flexible cooling bag flows into the refrigerating device through the liquid outlet pipe to be cooled, and then the frozen brine is pumped back into the flexible cooling bag from the outlet of the refrigerating device through the variable-frequency circulating pump so as to circulate continuously.
The flexible cooling device can be arranged into a detachable structure, can be used as a temporary reinforced cooling mode of a transformer, can also be used as a permanent fixed cooling mode, and can be flexibly configured and applied according to actual conditions. The invention can also carry out local cooling aiming at local overheating parts of the transformer, such as a transformer on-load switch, a sleeve and the like, thereby realizing accurate targeted cooling.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (7)
1. The utility model provides a transformer with flexible cooling device, its characterized in that, includes transformer main part and flexible cooling device, transformer main part includes the casing, installs iron core and winding in the casing, installs the radiator on the casing to and the transformer oil of circulation flow between casing and radiator, flexible cooling device includes flexible cooling bag group and coolant liquid circulation system, flexible cooling bag group comprises a plurality of flexible cooling bags in series-parallel connection, and flexible cooling bag expert has the circulation flow coolant liquid, the attached installation of each flexible cooling bag of flexible cooling bag group is on the heat transfer wall of radiator, coolant liquid circulation system is connected with flexible cooling bag group through the intercommunication pipeline to drive coolant liquid circulation flow between each flexible cooling bag and coolant liquid circulation system, constantly cool off transformer oil.
2. The transformer with flexible cooling device of claim 1, wherein the flexible cooling bag is made of flexible carbon fiber material with heat conductivity, and the cooling liquid is frozen brine.
3. The transformer with the flexible cooling device as claimed in claim 1, wherein the flexible cooling bags of the flexible cooling bag set are further attached to the transformer housing and other components to be cooled.
4. The transformer of claim 1, wherein the cooling fluid circulating system comprises a variable frequency circulating pump, a refrigerating device, an electromagnetic valve, and a fluid inlet and a fluid outlet, an outlet of the variable frequency circulating pump is connected to an inlet of a first electromagnetic valve, an outlet of the first electromagnetic valve is connected to a fluid inlet pipe and is connected to the flexible cooling bag set through the fluid inlet pipe, the flexible cooling bags of the flexible cooling bag set are connected in series or in parallel through connecting pipes, so that the cooling fluid flowing in from the fluid inlet pipe flows between the flexible cooling bags and then flows together to the fluid outlet pipe connected to the flexible cooling bag set, the fluid outlet pipe is connected to an inlet of the refrigerating device through a second electromagnetic valve to cool the cooling fluid flowing out from the flexible cooling bag set, an outlet of the refrigerating device is connected to an inlet of the variable frequency circulating pump to drive the cooled cooling fluid to flow into the flexible cooling bag set through the variable frequency circulating pump, and circulating the cooling liquid between each flexible cooling bag and the cooling liquid circulating system.
5. The transformer with the flexible cooling device according to claim 4, further comprising a control module and a temperature sensor, wherein the temperature sensor is mounted on the transformer main body and electrically connected to an input end of the control module to monitor the temperature of the transformer oil in the transformer in real time and transmit temperature measurement data to the control module, and an output end of the control module is electrically connected to control ends of the variable frequency circulating pump, the refrigeration device, the first electromagnetic valve and the second electromagnetic valve respectively to control the variable frequency circulating pump, the refrigeration device, the first electromagnetic valve and the second electromagnetic valve to operate.
6. The transformer with the flexible cooling device according to claim 5, wherein the control module automatically controls the start-stop and output of the refrigeration device and the variable frequency circulating pump according to the oil temperature of the transformer and the main transformer load, and controls the opening and closing of the first electromagnetic valve and the second electromagnetic valve.
7. The method for controlling the transformer with the flexible cooling device according to claim 6, comprising the steps of:
1) attaching and installing flexible cooling bags on a radiator of the transformer, and forming flexible cooling bag groups by the flexible cooling bags and connecting the flexible cooling bag groups with a cooling liquid circulating system; according to the running state of the transformer, a control program for automatically controlling the starting and stopping of the refrigerating device and the variable frequency circulating pump and controlling the opening and closing of the first electromagnetic valve and the second electromagnetic valve according to the oil temperature of the transformer and the main transformer load is preset in the control module;
2) when the temperature sensor detects that the oil temperature of the transformer reaches a first set value, the control module controls the first electromagnetic valve and the second electromagnetic valve to be opened, then controls the refrigeration device and the variable-frequency circulating pump to be started, and the flexible cooling device starts to operate;
3) when the load of the transformer is continuously increased and the temperature of the transformer oil is continuously increased to a second set value, the control module controls the refrigerating device and the variable-frequency circulating pump to increase the output, and the output is correspondingly increased along with the continuous increase of the temperature of the transformer oil and the load of the transformer, so that the cooling effect is achieved, and the safe operation of the transformer is ensured;
4) when the load of the transformer is reduced and the oil temperature of the transformer is reduced, the control module controls the refrigerating device and the variable-frequency circulating pump to reduce the output, and the output is correspondingly reduced along with the continuous reduction of the oil temperature and the load of the transformer, so that the matching is reasonably optimized and the energy consumption is saved;
5) when the temperature sensor detects that the temperature of the transformer oil drops to a third set value, the control module controls the refrigeration device and the variable-frequency circulating pump to stop working, then controls the first electromagnetic valve and the second electromagnetic valve to be closed, and the flexible cooling device stops running.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010239100.5A CN111243831A (en) | 2020-03-30 | 2020-03-30 | Transformer with flexible cooling device and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010239100.5A CN111243831A (en) | 2020-03-30 | 2020-03-30 | Transformer with flexible cooling device and control method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN111243831A true CN111243831A (en) | 2020-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010239100.5A Pending CN111243831A (en) | 2020-03-30 | 2020-03-30 | Transformer with flexible cooling device and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117123985A (en) * | 2023-10-27 | 2023-11-28 | 内蒙古工业大学 | Welding cooling auxiliary assembly |
-
2020
- 2020-03-30 CN CN202010239100.5A patent/CN111243831A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117123985A (en) * | 2023-10-27 | 2023-11-28 | 内蒙古工业大学 | Welding cooling auxiliary assembly |
| CN117123985B (en) * | 2023-10-27 | 2024-01-26 | 内蒙古工业大学 | Welding cooling auxiliary assembly |
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