CN211604875U - Traction transformer based on natural ester insulating liquid - Google Patents
Traction transformer based on natural ester insulating liquid Download PDFInfo
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- CN211604875U CN211604875U CN202020669384.7U CN202020669384U CN211604875U CN 211604875 U CN211604875 U CN 211604875U CN 202020669384 U CN202020669384 U CN 202020669384U CN 211604875 U CN211604875 U CN 211604875U
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Abstract
The application discloses traction transformer based on natural ester insulating solution includes: the low-voltage winding is sleeved outside the iron core; the high-voltage winding is sleeved outside the low-voltage winding; the iron core, the low-voltage winding and the high-voltage winding are immersed in the natural ester insulating liquid, and the temperature of the top layer insulating liquid of the transformer, the average temperature of the winding and the hot spot temperature can be improved through the high-temperature performance of the natural ester insulating liquid filled around the winding, so that the overload capacity of the transformer is improved, the insulation level of the whole transformer is improved, and the transformer is high in overload capacity, short circuit resistance, fire resistance, environmental protection performance and reliability.
Description
Technical Field
The application relates to a traction transformer based on natural ester insulating liquid, and belongs to the field of high-voltage power transmission.
Background
The traction load of the electrified railway is influenced by factors such as a line ramp, a transportation organization and the like, and the phenomenon of overload that the average load is low but the short-time load is 2-3 times higher exists. The capacity of the traction transformer is often determined according to the requirement of short-time load, so that the installation capacity of the traction transformer is large, the capacity utilization rate is low, and the basic electricity expense is high.
In order to solve the above problems, the following measures are adopted at the present stage:
1. a traction transformer with high capacity utilization rate such as a single-phase connection wire and a Vv connection wire is used;
2. and determining the basic electricity fee of the transformer according to a maximum demand method.
After the measures are adopted, the economic operation condition of the traction transformer is poor, the matching degree of the load demand and the capacity configuration is poor, and the electricity expense under low load is more and unreasonable.
At present, mineral oil is used as an insulating and heat-dissipating medium in the traction transformer of the electrified railway, and the ignition point of the mineral oil is 165 ℃. The mineral oil has low burning point, and once the transformer breaks down in use, the potential fire hazard is easily caused. Mineral oil is difficult to degrade in a spontaneous combustion environment, and the environment is polluted by overflow.
The natural ester insulating liquid is flame-retardant insulating cooling oil developed in 90 s of the 20 th century, can be degraded by more than 97 percent within 21 days, is renewable, and is green and environment-friendly; the clean water is good, water in the insulating material can be analyzed, the aging of the insulating paper is delayed, the service life of the transformer can be prolonged, and the overload capacity of the transformer can be improved. The natural ester has a burning point of over 300 ℃, belongs to the fire-resistant oil, has low combustion heat value and has good self-extinguishing flame retardance.
Although the natural ester insulating liquid immersed transformer has good environmental protection and flame retardant properties and overload capacity, only part of distribution transformers below 35kV are put into practical operation at present. The kinematic viscosity of the natural ester insulating liquid is far greater than that of mineral oil, so that the insulating property of the natural ester insulating liquid is different from that of the mineral oil, the natural ester insulating liquid cannot be directly applied to a traction transformer, the excellent performance of the natural ester insulating liquid is exerted, and the overload capacity of the traction transformer is improved.
The temperature of an internal winding of the existing traction transformer is mostly obtained by adopting a simulation calculation mode, and the obtained internal temperature is poor in accuracy.
SUMMERY OF THE UTILITY MODEL
The present application provides a traction transformer based on a natural ester insulating fluid for solving the above technical problems.
The application provides a traction transformer based on natural ester insulating fluid includes: at least one group of iron core, low voltage winding, high voltage winding and low voltage winding are sleeved outside the iron core;
the high-voltage winding is sleeved outside the low-voltage winding;
the low-voltage winding comprises: the low-voltage winding oil baffle comprises a supporting paper tube, low-voltage winding stays, low-voltage oil duct cushion blocks, low-voltage wires, a low-voltage winding outer oil baffle, a low-voltage winding inner oil baffle and a low-voltage winding outer locking bar;
a plurality of low-voltage winding supporting strips are uniformly fixed on the outer wall of the supporting paper cylinder, low-voltage wires are wound on the low-voltage winding supporting strips in a wire cake mode, and low-voltage oil duct cushion blocks are arranged among the wire cakes wound by the low-voltage wires;
one end of the low-pressure oil duct cushion block is fixed on the low-pressure winding stay, and the other end of the low-pressure oil duct cushion block is connected with the low-pressure winding outer locking bar;
the low-voltage winding stay, the low-voltage oil duct cushion block and the low-voltage winding external locking stay support form an oil gap around a wire cake wound by a low-voltage lead;
the low-voltage winding inner oil baffle and the low-voltage winding outer oil baffle are arranged in a low-voltage oil duct cushion block and an oil gap between the wire cakes wound by the low-voltage lead in a staggered manner.
Preferably, the high voltage winding comprises: the high-voltage winding comprises high-voltage winding stays, high-voltage wires, a high-voltage winding outer oil baffle, a screen, a high-voltage winding inner oil baffle, a high-voltage oil duct cushion block and a high-voltage winding outer locking bar;
the high-voltage wires are wound on a plurality of high-voltage winding supporting strips;
a plurality of high-pressure oil duct cushion blocks are arranged among the wire cakes wound by the high-pressure wires, one ends of the high-pressure oil duct cushion blocks are fixed on the high-pressure winding supporting strips, the other ends of the high-pressure oil duct cushion blocks are connected with the high-pressure winding outer locking strips, and the enclosure screen is enclosed outside the high-pressure winding outer locking strips;
an oil gap is formed around a wire cake wound by a high-voltage lead through the support of a high-voltage winding stay, a high-voltage oil duct cushion block and a high-voltage winding outer locking bar;
the high-voltage winding outer oil baffle and the high-voltage winding inner oil baffle are arranged in a high-voltage oil duct cushion block and an oil gap between the wire cakes wound by the high-voltage wires in a staggered manner.
Preferably, the outer walls of the low-voltage lead and the high-voltage lead are wrapped with lead insulation layers made of thermal modified paper;
the high-pressure oil duct cushion block and the low-pressure oil duct cushion block are made of thermal modified paper.
Preferably, the method further comprises the following steps: the oil clearance paper tube and the oil clearance stay are arranged between the high-voltage winding and the low-voltage winding, and the oil clearance stay is arranged between the adjacent oil clearance paper tubes.
Preferably, the low-voltage winding inner oil baffle and the low-voltage winding outer oil baffle are arranged in a staggered mode from the lower end of the low-voltage winding to divide the low-voltage winding into an even number of areas;
the inner side of the oil baffle plate in the low-voltage winding is vertically connected with the outer wall of the supporting paper tube, and the other side of the oil baffle plate is flush with the outer side of a wire cake wound by a low-voltage wire;
the outer side of the low-voltage winding outer oil baffle is vertically connected with the inner wall of an oil gap paper tube surrounding the outer side of the low-voltage winding, and the other side of the oil baffle is flush with the inner side of a wire cake wound by a low-voltage lead.
Preferably, the high-voltage winding outer oil baffle and the high-voltage winding inner oil baffle are arranged in a staggered manner from the lower end of the high-voltage winding to divide the high-voltage winding into an even number of areas;
the inner side of an oil baffle plate in the high-voltage winding is vertically connected with the outer wall of an oil gap paper tube close to the high-voltage winding, and the other side of the oil baffle plate is flush with the outer side of a coil cake wound by a high-voltage lead;
the outer side of the high-voltage winding outer oil baffle is vertically connected with the inner wall of a screen surrounding the outer side of the high-voltage winding outer locking bar, and the other side of the high-voltage winding outer oil baffle is flush with the inner side of a coil cake wound by a high-voltage lead.
Preferably, the oil clearance paper tube comprises: the first oil clearance paper cylinder, the second oil clearance paper cylinder and the third oil clearance paper cylinder are arranged between the high-voltage winding and the low-voltage winding at intervals;
the first oil clearance paper cylinder is arranged close to the outer side of the low-voltage winding, and the third oil clearance paper cylinder is close to the inner side of the high-voltage winding;
the second oil clearance paper cylinder is arranged between the first oil clearance paper cylinder and the third oil clearance paper cylinder;
the oil clearance stay includes: the first oil clearance stay is arranged between the first oil clearance paper tube and the second oil clearance paper tube, and the second oil clearance stay is arranged between the second oil clearance paper tube and the third oil clearance paper tube.
Preferably, the method further comprises the following steps: the angle rings are symmetrically arranged at the upper end part and the lower end part of the high-voltage winding and are inserted between the oil gap paper cylinders; the end parts are symmetrically placed on the top surfaces and the bottom surfaces of the low-voltage winding and the high-voltage winding angle ring in an insulated manner; the pressing plate is placed on the insulating top surfaces of the low-voltage winding and the high-voltage winding angle ring.
Preferably, the method further comprises the following steps: the temperature measuring probes are at least arranged in a high-pressure oil duct cushion block between high-pressure wires at the upper half part of the high-pressure winding or a low-pressure oil duct cushion block between low-pressure wires at the upper half part of the low-pressure winding;
one end of the transmission optical fiber is connected with the optical fiber temperature controller, and the other end of the transmission optical fiber is connected with the temperature measuring probe;
the optical fiber temperature controller is arranged outside the shell of the transformer.
Preferably, the method further comprises the following steps: an alarm module for sending out an alarm signal,
the optical fiber temperature controller comprises: a display and relay interface;
the alarm module is electrically connected with the relay interface of the optical fiber temperature controller.
The beneficial effects that this application can produce include:
1) the application provides a traction transformer based on natural ester insulating solution adopts thermal modification paper as the wire insulating layer, fills natural ester insulating solution around the winding wire, and transformer top layer insulating solution temperature, winding average temperature and hot spot temperature all can improve to improve the overload capacity of transformer, improve whole transformer's insulation level, this transformer overload capacity and anti short circuit ability reinforce, fire behavior is high, environmental protection performance is good, the reliability is high.
2) According to the traction transformer based on the natural ester insulating liquid, the no-load loss of the transformer is reduced by 20% compared with a standard value, the load loss is reduced by 25% compared with the standard value, and the overload capacity of the transformer is 1.25 times. The transformer is suitable for electrified railways with the characteristics of low average load and serious short-time overload, and is also suitable for projects needing the capacity expansion of a traction transformer in a long term; when the traction transformer is used, the type can be selected according to the initial capacity, the stronger overload capacity of the product is utilized in a long term, high-load operation can be continued, the transformer does not need to be replaced, the construction investment is saved, and the safety risk caused by the energy expansion construction of the existing line is avoided.
3) According to the traction transformer based on the natural ester insulating liquid, the oil baffle plate is arranged in the winding, the natural ester insulating liquid with higher flowing viscosity flows in the winding according to a set oil flow structure, and the hot point temperature in the winding is reduced.
4) According to the traction transformer based on the natural ester insulating liquid, the plurality of temperature measuring probes are arranged at the temperature hot spot positions of the high-voltage winding, the low-voltage winding, the iron core and the insulating liquid respectively, and the temperature measuring probes are connected with the optical fiber temperature controller outside the shell of the transformer, so that the hot spot temperatures of the winding, the iron core and the insulating liquid inside the transformer can be displayed in real time, and the condition of the hot spot temperature of the transformer is monitored conveniently; meanwhile, the optical fiber temperature controller is also electrically connected with the alarm module and sends out overtemperature alarm according to the real-time temperature.
Drawings
FIG. 1 is a schematic diagram of a traction transformer based on a natural ester insulating fluid provided herein;
FIG. 2 is a schematic connection diagram of a traction transformer optical fiber temperature measurement system based on a natural ester insulating liquid provided by the present application;
illustration of the drawings:
1. an iron core; 2. supporting the paper tube; 3. pressing a plate; 4. end insulation; 5. an angle ring; 6. a high-voltage wire; 7. a high-voltage winding stay; 8. a high-pressure oil duct cushion block; 9. an oil baffle plate in the high-voltage winding; 10. an outer oil baffle of the high-voltage winding; 11. a screen; 12. a low-pressure oil duct cushion block; 13. a low voltage winding stay; 14. A low-voltage wire; 15. an oil clearance paper cylinder; 16. an outer oil baffle of the low-voltage winding; 17. an oil baffle plate in the low-voltage winding; 18. an oil clearance stay; 19. an outer locking bar of the low-voltage winding; 20. a temperature measuring probe; 21. a transmission optical fiber; 22. an optical fiber temperature controller; 23. an alarm module; 24. a display.
Detailed Description
The present application will be described in detail with reference to examples, but the present application is not limited to these examples.
Referring to fig. 1, the present application provides a traction transformer based on a natural ester insulating fluid, comprising: the transformer comprises at least one group of iron core 1, a low-voltage winding and a high-voltage winding, wherein the low-voltage winding is close to the iron core 1 and is sleeved outside the iron core 1; the high-voltage winding is sleeved outside the low-voltage winding.
The low-voltage winding comprises: the device comprises a supporting paper cylinder 2, a low-voltage winding stay 13, a low-voltage oil duct cushion block 12, a low-voltage lead 14, a low-voltage winding outer oil baffle 16, a low-voltage winding inner oil baffle 17 and a low-voltage winding outer locking bar;
a plurality of low-voltage winding supporting strips 13 are uniformly fixed on the outer wall of the supporting paper cylinder 2, low-voltage wires 14 are wound on the low-voltage winding supporting strips 13 in a wire cake mode, and low-voltage oil duct cushion blocks 12 are arranged among the wire cakes wound by the low-voltage wires 14;
one end of a low-pressure oil duct cushion block 12 is fixed on a low-pressure winding stay 13, and the other end of the low-pressure oil duct cushion block 12 is connected with an external locking bar of the low-pressure winding;
the low-voltage winding stay 13, the low-voltage oil duct cushion block 12 and the low-voltage winding external locking bar support form an oil gap around a wire cake wound by a low-voltage lead 14;
the low-voltage winding inner oil baffle 17 and the low-voltage winding outer oil baffle 16 are arranged in the low-voltage oil duct cushion block 12 and the oil gap between the wire cakes wound by the low-voltage lead 14 in a staggered mode.
Through the improvement to the low pressure winding structure, form direction oil duct structure, improve the flow velocity of natural ester insulating liquid in the winding, improve the efficiency of taking away the heat in the winding, reduce the hot spot temperature of winding, overcome the mobility that insulating oil itself high viscosity leads to poor, the problem of the unable effective heat conduction.
The high-voltage lead 6 and the low-voltage lead 14 are wound according to the winding requirement in the existing transformer.
The natural ester insulating oil used for filling the oil gap is an insulating liquid extracted from plant seeds or other suitable biological materials and used for transformers or similar electrical equipment, and the main component of the insulating liquid is triglyceride. For example, vegetable oil such as rapeseed oil, sunflower seed oil, etc.
Preferably, the high voltage winding comprises: the high-voltage winding comprises a high-voltage winding stay 7, a high-voltage wire 6, a high-voltage winding outer oil baffle 10, a screen 11, a high-voltage winding inner oil baffle 9, a high-voltage oil duct cushion block 8 and a high-voltage winding outer locking bar;
the high-voltage wire 6 is wound into a wire cake structure with the same inner and outer diameters, and a plurality of high-voltage winding supporting strips 7 are uniformly distributed on the inner diameter side of the wire cake wound by the high-voltage wire 6;
a plurality of high-pressure oil duct cushion blocks 8 are arranged among the wire cakes wound by the high-pressure wires 6, one ends of the high-pressure oil duct cushion blocks 8 are fixed on the high-pressure winding stay 7, the other ends of the high-pressure oil duct cushion blocks 8 are connected with the high-pressure winding outer locking bar, and the enclosure 11 is enclosed outside the high-pressure winding outer locking bar;
an oil gap is formed around a wire cake wound by the high-voltage lead 6 through the support of a high-voltage winding stay 7, a high-voltage oil duct cushion block 8 and an external locking bar of the high-voltage winding;
the high-voltage winding outer oil baffle 10 and the high-voltage winding inner oil baffle 9 are arranged in a high-voltage oil duct cushion block 8 and an oil gap between the wire cakes wound by the high-voltage wires 6 in a staggered mode.
The oil clearance paper tube 15 can divide a large-size oil clearance between the high-voltage winding and the low-voltage winding into a plurality of small oil clearances, and improves the insulating strength of the oil clearance between the high-voltage winding and the low-voltage winding.
Although the natural ester insulating liquid immersed transformer has good environmental protection, flame retardant performance and overload capacity, because of high viscosity and poor fluidity, only part of distribution transformers below 35kV are put into practical operation at present, and no batch application example exists in the field of traction transformers.
This application is through adopting above-mentioned structure, can improve the directional flow of higher natural ester insulating oil in 1 surface of transformer core and winding, and the hot medium effect of heat is taken away in effective performance. It is possible to use natural ester insulating oil as the insulating oil in the traction transformer. By adopting the structure, the average temperature rise and the hot spot temperature rise of the winding are reduced.
The transformer is subjected to a temperature rise test under the over-rated capacity load, and the over-load temperature rise test is respectively carried out on the typical load curves of the rated capacity load and the over-rated capacity load, and the test result meets the technical condition requirement.
The application provides transformer according to the operation characteristics that traction load average load is low, overload is serious in short-term, utilize modified insulating material and fire-retardant type natural ester, improve the inside mixed insulation system of transformer, promote traction transformer's insulation grade, and then improve traction transformer's overload ability. For projects needing capacity expansion of the traction transformer in a long term, the traction transformer can be selected according to initial capacity, the hybrid insulation system can be continuously operated in the long term by utilizing the strong overload capacity of the hybrid insulation system, construction investment is saved, and safety risks caused by energy expansion construction of the existing line are avoided. Meanwhile, due to the adoption of a high-temperature mixed insulation system, the transformer has lower loss and remarkable energy-saving effect.
Preferably, the outer walls of the low-voltage lead 14 and the high-voltage lead 6 are wrapped with a lead insulation layer made of thermal modified paper;
the high-pressure oil duct cushion block 8 and the low-pressure oil duct cushion block 12 are made of thermal modified paper.
The heat-resistant grade of the thermal modified paper is high, and the temperature of the top insulating liquid of the transformer, the average temperature of windings and the temperature of hot spots are all improved, so that the overload capacity of the transformer is improved.
Preferably, the method further comprises the following steps: the oil clearance paper tube 15 and the oil clearance stay 18, set up multilayer oil clearance paper tube 15 between high-voltage winding and the low-voltage winding, set up oil clearance stay 18 between adjacent oil clearance paper tube 15. The oil gap between the high-voltage and low-voltage windings can be well separated by arranging the oil gap paper tube 15 and the oil gap supporting strips 18, so that a small oil gap structure is formed, and the insulating strength of the oil gap is enhanced.
Preferably, the low-voltage winding inner oil baffle 17 and the low-voltage winding outer oil baffle 16 are arranged in a staggered manner from the lower end of the low-voltage winding to divide the low-voltage winding into an even number of areas;
the inner side of the oil baffle 17 in the low-voltage winding is vertically connected with the outer wall of the supporting paper tube 2, and the other side of the oil baffle is flush with the outer side of a wire cake wound by the low-voltage lead 14;
the outer side of the low-voltage winding outer oil baffle 16 is vertically connected with the inner wall of an oil clearance paper tube 15 surrounding the outer side of the low-voltage winding, and the other side of the oil baffle is flush with the inner side of a coil cake wound by the low-voltage lead 14. The guide oil passage is formed according to the arrangement, and the flow capacity of the insulating oil is enhanced.
Preferably, the high-voltage winding outer oil baffle plate 10 and the high-voltage winding inner oil baffle plate 9 are arranged in a staggered manner from the lower end of the high-voltage winding to divide the high-voltage winding into an even number of areas;
the inner side of the oil baffle plate 9 in the high-voltage winding is vertically connected with the outer wall of an oil gap paper tube 15 close to the high-voltage winding, and the other side of the oil baffle plate is flush with the outer side of a coil cake wound by the high-voltage lead 6;
the outer side of the high-voltage winding outer oil baffle plate 10 is vertically connected with the inner wall of a surrounding screen 11 surrounding the outer side of the high-voltage winding outer locking bar, and the other side of the high-voltage winding outer oil baffle plate is flush with the inner side of a coil cake wound by the high-voltage lead 6. The guide oil passage is formed according to the arrangement, and the flow capacity of the insulating oil is enhanced.
Preferably, the oil clearance paper tube 15 includes: the winding device comprises a first oil clearance paper cylinder 15, a second oil clearance paper cylinder 15 and a third oil clearance paper cylinder 15, wherein the first oil clearance paper cylinder 15, the second oil clearance paper cylinder 15 and the third oil clearance paper cylinder 15 are arranged between a high-voltage winding and a low-voltage winding at intervals;
the first oil clearance paper tube 15 is arranged close to the outer side of the low-voltage winding, and the third oil clearance paper tube 15 is close to the inner side of the high-voltage winding;
the second oil clearance paper cylinder 15 is arranged between the first oil clearance paper cylinder 15 and the third oil clearance paper cylinder 15;
the oil clearance stay 18 includes: the oil clearance structure comprises a first oil clearance stay 18 and a second oil clearance stay 18, wherein the first oil clearance stay 18 is arranged between the first oil clearance paper cylinder 15 and the second oil clearance paper cylinder 15, and the second oil clearance stay 18 is arranged between the second oil clearance paper cylinder 15 and the third oil clearance paper cylinder 15.
By arranging the three layers of oil gap paper cylinders 15, oil gaps between high-voltage and low-voltage windings can be effectively separated, a small oil gap structure is formed, the insulating strength of the oil gaps is enhanced, and the high-voltage insulation requirement of the transformer is met.
Preferably, the method further comprises the following steps: the winding comprises a plurality of layers of angle rings 5, a plurality of end part insulators 4 and a pressing plate 3, wherein the angle rings 5 are symmetrically arranged at the upper end part and the lower end part of a high-voltage winding and are inserted between oil gap paper tubes; the end insulation 4 is symmetrically arranged on the top surface and the bottom surface of the low-voltage winding and the high-voltage winding angle ring; the pressing plate 3 is placed on the insulation 4 on the top surfaces of the low-voltage winding and the high-voltage winding angle ring. The method can be set according to the setting method in the existing transformer. The pressing plate 3 is used as a coil fixing structure, can effectively press the high-voltage winding and the low-voltage winding in the axial direction, and prevents axial electrodynamic force generated when current flows through the windings or axial short-circuit force generated when a transformer is short-circuited from deforming the high-voltage winding or the low-voltage winding and damaging the transformer.
The angle rings 5 are arranged at the upper end part and the lower end part of the high-voltage winding and are inserted into the oil gap paper tube 15, so that the inlet and the outlet of the insulating oil at the upper end part and the lower end part of the high-voltage winding can be further limited, and the flowing speed of the insulating oil in the high-voltage winding can be further increased. The angle ring 5 is also made of insulating materials, the shape and the arrangement position of the angle ring are approximately overlapped with the equipotential surface of the end part of the high-voltage winding, the oil gap at the end part of the high-voltage winding is separated, and the breakdown field intensity of the oil gap at the end part is improved.
All parts are made of insulating materials except wires in the application. For example, the pressing plate 3 is made of an electrical laminated wood board, a wire insulating layer, and high-temperature insulating paper with a heat resistance grade of 120 ℃ and above, and other insulating materials are made of electrical insulating paper boards with a heat resistance grade of 105 ℃.
Referring to fig. 2, preferably, it further includes: the temperature measurement device comprises a plurality of temperature measurement probes 20, transmission optical fibers 21 and an optical fiber temperature controller 22, wherein the temperature measurement probes 20 are at least arranged in a high-voltage oil channel cushion block 8 between upper half high-voltage leads 6 of a high-voltage winding or a low-voltage oil channel cushion block 12 between upper half low-voltage leads 14 of a low-voltage winding; one end of the transmission optical fiber 21 is connected with an optical fiber temperature controller 22, and the other end is connected with a temperature measuring probe 20; the fiber optic temperature controller 22 is disposed outside the transformer housing.
The temperature measuring probe 20 can also be arranged in the iron yoke on the iron core 1 and in the insulating liquid on the top layer of the transformer according to requirements.
Temperature measuring probes 20 are arranged in the high-voltage winding and the low-voltage winding or the high-voltage winding and the low-voltage winding, so that the temperature conditions in the winding and the transformer can be obtained in real time and transmitted to an external display device through optical fibers; in the convenient use process, the internal temperature of the transformer is monitored, the abnormal change of the temperature can reflect the fault of the transformer in time, and the use safety of the transformer is improved. The hot spot temperature of the high-low voltage winding, the temperature of the oil top layer and the temperature of the iron core 1 can be displayed in real time.
Referring to fig. 2, preferably, it further includes: an alarm module 23, wherein the fiber optic temperature controller 22 comprises: a temperature display 24 and a relay interface; the alarm module 23 is electrically connected with the relay interface of the optical fiber temperature controller 22. The display 24 can display the temperature condition inside the transformer in real time, and is convenient to monitor. When the internal temperature of the transformer exceeds a preset value, the alarm module 23 sends out alarm information, and the use safety is further improved.
The product has the advantages of low loss, strong overload capacity and short circuit resistance, high fireproof performance, good environmental protection performance, high reliability and the like, and can monitor, analyze and evaluate the running state of the product on line.
Reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," "a preferred embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally in this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the disclosure to effect such feature, structure, or characteristic in connection with other embodiments.
Although the present application has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (9)
1. A traction transformer based on a natural ester insulating fluid, comprising: the transformer comprises at least one group of iron cores (1), a low-voltage winding and a high-voltage winding, wherein the low-voltage winding is sleeved outside the iron cores (1); the high-voltage winding is sleeved outside the low-voltage winding;
the low voltage winding includes: the low-voltage winding oil baffle structure comprises a supporting paper cylinder (2), low-voltage winding supporting strips (13), low-voltage oil channel cushion blocks (12), low-voltage wires (14), a low-voltage winding outer oil baffle plate (16), a low-voltage winding inner oil baffle plate (17) and a low-voltage winding outer locking strip (19);
a plurality of low-voltage winding supporting strips (13) are uniformly fixed on the outer wall of the supporting paper cylinder (2), low-voltage wires (14) are wound on the low-voltage winding supporting strips (13) in a wire cake mode, and low-voltage oil duct cushion blocks (12) are arranged among the wire cakes wound by the low-voltage wires (14);
one end of a low-pressure oil duct cushion block (12) is fixed on a low-pressure winding stay (13), and the other end of the low-pressure oil duct cushion block (12) is connected with an outer locking bar (19) of the low-pressure winding;
the low-voltage winding supporting strip (13), the low-voltage oil duct cushion block (12) and the low-voltage winding external locking strip (19) are supported, and an oil gap is formed around a wire cake wound by a low-voltage lead (14);
the low-voltage winding inner oil baffle plate (17) and the low-voltage winding outer oil baffle plate (16) are arranged in a low-voltage oil duct cushion block (12) and an oil gap between wire cakes wound by a low-voltage lead (14) in a staggered manner;
the high voltage winding includes: the high-voltage winding oil baffle structure comprises high-voltage winding supporting strips (7), high-voltage wires (6), a high-voltage winding outer oil baffle plate (10), a screen (11), a high-voltage winding inner oil baffle plate (9), a high-voltage oil duct cushion block (8) and a high-voltage winding outer locking strip;
the high-voltage wires (6) are wound on a plurality of high-voltage winding supporting strips (7);
a plurality of high-pressure oil duct cushion blocks (8) are arranged among wire cakes wound by the high-pressure wires (6), one ends of the high-pressure oil duct cushion blocks (8) are fixed on high-pressure winding supporting strips (7), the other ends of the high-pressure oil duct cushion blocks (8) are connected with high-pressure winding outer locking strips, and the enclosure screen (11) is enclosed outside the high-pressure winding outer locking strips;
an oil gap is formed around a wire cake wound by a high-voltage lead (6) through the support of a high-voltage winding stay (7), a high-voltage oil duct cushion block (8) and an external locking bar of the high-voltage winding;
the high-voltage winding outer oil baffle (10) and the high-voltage winding inner oil baffle (9) are arranged in a high-voltage oil duct cushion block (8) and an oil gap between the wire cakes wound by the high-voltage leads (6) in a staggered mode.
2. The traction transformer based on natural ester insulating fluid according to claim 1, wherein the outer walls of the low voltage wire (14) and the high voltage wire (6) are covered with a wire insulating layer made of thermally modified paper;
the high-pressure oil duct cushion block (8) and the low-pressure oil duct cushion block (12) are made of thermal modified paper.
3. The natural ester insulation based traction transformer of claim 1, further comprising: the oil clearance structure comprises oil clearance paper cylinders (15) and oil clearance supporting strips (18), wherein multiple layers of oil clearance paper cylinders (15) are arranged between the high-voltage winding and the low-voltage winding, and the oil clearance supporting strips (18) are arranged between the adjacent oil clearance paper cylinders (15).
4. The traction transformer based on natural ester insulating fluid according to claim 3, characterized in that the low voltage winding inner oil baffle (17) and the low voltage winding outer oil baffle (16) are staggered from the lower end of the low voltage winding, dividing the low voltage winding into an even number of areas;
the inner side of the oil baffle plate (17) in the low-voltage winding is vertically connected with the outer wall of the supporting paper cylinder (2), and the other side of the oil baffle plate is flush with the outer side of a wire cake wound by a low-voltage lead (14);
the outer side of the low-voltage winding outer oil baffle plate (16) is vertically connected with the inner wall of an oil clearance paper tube (15) surrounding the outer side of the low-voltage winding, and the other side of the oil baffle plate is flush with the inner side of a coil cake wound by a low-voltage lead (14).
5. The traction transformer based on natural ester insulating fluid according to claim 3, characterized in that the high voltage winding outer oil baffle (10) and the high voltage winding inner oil baffle (9) are staggered from the lower end of the high voltage winding, dividing the high voltage winding into an even number of zones;
the inner side of the oil baffle plate (9) in the high-voltage winding is vertically connected with the outer wall of an oil gap paper tube (15) close to the high-voltage winding, and the other side of the oil baffle plate is flush with the outer side of a coil cake wound by a high-voltage lead (6);
the outer side of the high-voltage winding outer oil baffle plate (10) is vertically connected with the inner wall of a surrounding screen (11) surrounding the outer side of the high-voltage winding outer locking bar, and the other side of the high-voltage winding outer oil baffle plate is flush with the inner side of a coil cake wound by a high-voltage lead (6).
6. Traction transformer based on natural ester insulation liquid according to claim 3, characterized in that the oil gap paper cylinder (15) comprises: the first oil clearance paper cylinder, the second oil clearance paper cylinder and the third oil clearance paper cylinder are arranged between the high-voltage winding and the low-voltage winding at intervals;
the first oil clearance paper tube is arranged close to the outer side of the low-voltage winding, and the third oil clearance paper tube is close to the inner side of the high-voltage winding;
the second oil clearance paper cylinder is arranged between the first oil clearance paper cylinder and the third oil clearance paper cylinder;
the oil clearance stay (18) includes: the first oil clearance stay is arranged between the first oil clearance paper tube and the second oil clearance paper tube, and the second oil clearance stay is arranged between the second oil clearance paper tube and the third oil clearance paper tube.
7. The traction transformer based on natural ester insulating fluid according to claim 3, further comprising: the winding comprises a plurality of layers of angle rings (5), a plurality of end insulators (4) and a pressing plate (3), wherein the angle rings (5) are symmetrically arranged at the upper end part and the lower end part of a high-voltage winding and are inserted between oil gap paper tubes (15);
the end insulation (4) is symmetrically arranged on the top surface and the bottom surface of the low-voltage winding and the high-voltage winding angle ring;
and the pressing plate (3) is placed on the insulation (4) on the top surfaces of the low-voltage winding and the high-voltage winding angle ring.
8. The natural ester insulation based traction transformer of claim 1, further comprising: the temperature measurement device comprises a plurality of temperature measurement probes (20), transmission optical fibers (21) and an optical fiber temperature controller (22), wherein the temperature measurement probes (20) are at least arranged in a high-pressure oil channel cushion block (8) between high-pressure wires (6) on the upper half part of a high-pressure winding or a low-pressure oil channel cushion block (12) between low-pressure wires (14) on the upper half part of a low-pressure winding;
one end of the transmission optical fiber (21) is connected with the optical fiber temperature controller (22), and the other end is connected with the temperature measuring probe (20);
the optical fiber temperature controller (22) is arranged outside the shell of the transformer.
9. The natural ester insulation based traction transformer of claim 8, further comprising: an alarm module (23), the fiber optic temperature controller (22) comprising: a display (24) and relay interface; the alarm module (23) is electrically connected with a relay interface of the optical fiber temperature controller (22).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020669384.7U CN211604875U (en) | 2020-04-27 | 2020-04-27 | Traction transformer based on natural ester insulating liquid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020669384.7U CN211604875U (en) | 2020-04-27 | 2020-04-27 | Traction transformer based on natural ester insulating liquid |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112837906A (en) * | 2021-01-07 | 2021-05-25 | 国网山东省电力公司菏泽供电公司 | Compact natural ester insulating oil transformer body structure |
| CN113270244A (en) * | 2021-04-25 | 2021-08-17 | 山东输变电设备有限公司 | Converter transformer coil structure with novel forming angle ring and manufacturing method thereof |
| CN114141502A (en) * | 2021-11-24 | 2022-03-04 | 保定天威保变电气股份有限公司 | High-temperature-resistant environment-friendly transformer insulation system |
-
2020
- 2020-04-27 CN CN202020669384.7U patent/CN211604875U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112837906A (en) * | 2021-01-07 | 2021-05-25 | 国网山东省电力公司菏泽供电公司 | Compact natural ester insulating oil transformer body structure |
| CN113270244A (en) * | 2021-04-25 | 2021-08-17 | 山东输变电设备有限公司 | Converter transformer coil structure with novel forming angle ring and manufacturing method thereof |
| CN113270244B (en) * | 2021-04-25 | 2022-05-31 | 山东输变电设备有限公司 | Converter transformer coil structure with formed angle ring and manufacturing method thereof |
| CN114141502A (en) * | 2021-11-24 | 2022-03-04 | 保定天威保变电气股份有限公司 | High-temperature-resistant environment-friendly transformer insulation system |
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Address after: No. 212, tuoxiang Road, Luoyang sub district office, Kunming Economic Development Zone, China (Yunnan) pilot Free Trade Zone, Kunming, Yunnan 650000 Patentee after: YUNNAN TRANSFORMER ELECTRIC Co.,Ltd. Address before: No.71, Changyuan Road, high tech Industrial Development Zone, Kunming, Yunnan 650000 Patentee before: YUNNAN TRANSFORMER ELECTRIC Co.,Ltd. |