CN109817421A - Oil immersed type mutual reactor and its coil block - Google Patents

Abstract

The invention relates to an oil-immersed coupling reactor and a coil assembly thereof. The coil assembly includes first and second coils that are juxtaposed and sleeved on the iron core along the length direction of the iron core. The winding directions of the first and second coils are the same. The ends facing away from each other are connected to each other to form the outlet end; when energized, magnetic fluxes of equal size and opposite directions are formed between the first and second coils to couple to reduce the voltage loss of the circuit; any branch connected to the two coils respectively When short-circuited, the coil corresponding to the short-circuit branch generates a magnetic flux much larger than that of the other coil to limit the short-circuit current. Part of the magnetic flux is offset by coupling, thereby reducing the voltage and energy consumption of the line by the reactor, and when any branch connected to the coil is short-circuited, the corresponding coil can generate a magnetic flux much larger than that of the other coil. Limit the short-circuit current in the line and protect the line safety.

Description

Oil-immersed coupling reactor and its coil assembly

technical field

The present invention relates to an oil-immersed coupling reactor and its coil assembly.

Background technique

Reactor is an inductor, which provides an inductance value on an electrical circuit and is mainly used to limit short-circuit current and provide inductive reactive power compensation in the line. The existing oil-immersed coupled reactor includes a three-phase coil, and the single-phase coil includes an iron core and a coil wound on the iron core. When the coil is wound, it is generally spirally wound from one end of the iron core to the other end clockwise or counterclockwise. When the line is in normal use, for example, when the current in the circuit is normal, the reactor only consumes electric energy. When the line is short-circuited, the reactor acts to limit the short-circuit current. With the increasing requirements for energy saving and environmental protection, the problem of energy waste caused by the action of the coil magnetic flux has become increasingly prominent in this type of reactor, especially in circuits with voltages of 330KV and higher, the problems of voltage loss and energy waste are more serious , how to meet the safety protection of the reactor to the circuit while further reducing the voltage and energy loss caused by the circuit has become a focus of reactor technology research.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an oil-immersed coupled reactor that can not only meet the normal use requirements of the reactor to limit short-circuit current and reactive power compensation, but also reduce the voltage and energy loss in the circuit; the purpose of the present invention is to provide A coil assembly.

In order to achieve the above purpose, the coil assembly of the present invention adopts the following technical solutions:

Technical solution 1: The coil assembly includes an iron core, and also includes first and second coils that are juxtaposed on the iron core along the length direction of the iron core. The winding directions of the first and second coils are the same, and the ends of the two coils are close to each other. Connect to each other to form the incoming line end, and the ends of the two coils away from each other are connected to each other to form the outgoing line end; when energized, magnetic fluxes of equal size and opposite directions are formed between the first and second coils for coupling to reduce circuit voltage loss; When any branch connected to the two coils is short-circuited, the coil corresponding to the short-circuit branch generates a magnetic flux much larger than that of the other coil to limit the short-circuit current. Beneficial effects: the present invention forms two parallel coils through the first and second coils set in parallel along the length direction of the iron core, and the magnetic fluxes of equal size and opposite directions are formed between the two coils for coupling, and the coupling cancels them out. Part of the magnetic flux, thereby reducing the voltage and energy consumption of the line by the reactor, and when a short circuit occurs in any branch connected to the coil, a magnetic flux much larger than the other coil can be generated through the corresponding coil, thereby limiting the circuit. short-circuit current to protect the line safety.

Technical solution 2: On the basis of technical solution 1, the first coil and/or the second coil are pie-shaped structures, and the pie-shaped structures are arranged at intervals. The coil adopts a pie structure to form a space between the pie and the pie, which is convenient for the passage of insulating oil to improve the insulation effect and heat dissipation effect.

Technical solution 3: On the basis of technical solution 2, the first and second coils are wrapped with NOMEX paper on the inner and outer sides for insulation. The insulation performance between the coils can be further improved.

Technical solution 4: On the basis of any one of technical solutions 1-3, the iron core is a segmented structure, and the segments are arranged at intervals.

Technical solution 5: On the basis of technical solution 4, each segment of the iron core forms an integrated structure through vacuum casting technology.

The oil-immersed coupling reactor of the present invention adopts the following technical scheme:

Technical solution 1: The oil-immersed coupled reactor includes a box body and a coil assembly installed in the box body, the box body is filled with insulating oil, the coil assembly includes an iron core, and the coil assembly also includes a parallel sleeve along the length direction of the iron core. For the first and second coils on the core, the winding directions of the first and second coils are the same. The ends of the two coils that are close to each other are connected to each other to form the incoming end, and the ends of the two coils that are away from each other are connected to each other to form the outgoing end. 1. Magnetic fluxes of equal size and opposite direction are formed between the second coils for coupling to reduce the voltage loss of the circuit; when any branch connected to the two coils is short-circuited, the coil corresponding to the short-circuit branch generates far greater than the other The magnetic flux of the coil limits the short-circuit current. Beneficial effects: the present invention forms two parallel coils through the first and second coils set in parallel along the length direction of the iron core, and the magnetic fluxes of equal size and opposite directions are formed between the two coils for coupling, and the coupling cancels them out. Part of the magnetic flux, thereby reducing the voltage and energy consumption of the line by the reactor, and when a short circuit occurs in any branch connected to the coil, a magnetic flux much larger than the other coil can be generated through the corresponding coil, thereby limiting the circuit. short-circuit current to protect the line safety.

Technical solution 2: On the basis of technical solution 1, the first coil and/or the second coil are pie-shaped structures, and the pie-shaped structures are arranged at intervals. The coil adopts a pie structure to form a space between the pie and the pie, which is convenient for the passage of insulating oil to improve the insulation effect and heat dissipation effect.

Technical solution 3: On the basis of technical solution 2, the first and second coils are wrapped with NOMEX paper on the inner and outer sides for insulation. The insulation performance between the coils can be further improved.

Technical solution 4: On the basis of technical solution 1, the iron core is of a segmented structure, and the segments are arranged at intervals.

Technical solution 5: On the basis of technical solution 4, each segment of the iron core forms an integrated structure through vacuum casting technology.

Technical solution 6: On the basis of any one of technical solutions 1-5, the oil-immersed coupling reactor includes three-phase coil components, and the three-phase coil components are arranged in a shape of a letter.

Technical solution 7: On the basis of technical solution 6, the oil-immersed coupled reactor further includes an iron yoke connecting the three-phase coil components to form a magnetic circuit channel of the reactor.

Technical solution 8: On the basis of technical solution 7, the iron yoke is a rolled ring structure.

Technical solution 9: On the basis of any one of technical solutions 1-5, the insulating oil is vegetable oil. Compared with conventional mineral oil, it has better adsorption, keeps the coil dry, improves electrical performance, and is more environmentally friendly due to its decomposability.

Technical solution 10: On the basis of any one of technical solutions 1-5, the material of the box body is a non-magnetic material. It can prevent the box from generating heat due to the existence of eddy currents in the magnetic field.

Technical solution 11: On the basis of technical solution 10, a heat dissipation corrugated oil pipe is provided outside the box, and the heat dissipation corrugated oil pipe and the oil in the box form an oil circuit circulation. Improves heat dissipation performance.

Technical solution 12: On the basis of any one of technical solutions 1-5, the inlet and outlet ends are provided with cable-through insulator sleeves, and the three insulator sleeves are arranged side by side in three rows. Can improve insulation performance.

Description of drawings

Fig. 1 is the specific embodiment of the oil-immersed coupling reactor, the schematic diagram of the structure of the incoming line end A;

FIG. 2 is a schematic front view of the reactor body in FIG. 1;

Fig. 3 is the top view schematic diagram of Fig. 2;

Fig. 4 is the partial structure schematic diagram of the iron core column and the coil;

Fig. 5 is the principle schematic diagram of the magnetic flux generated by the coil assembly;

In the picture: 1-box body, 2-insulation sleeve, 3-cooling oil pipe, 4-reactor body, 5-vegetable oil, 6-iron yoke, 7-coil winding, 71-first coil, 72-second coil , 8-core column, 9-center screw, 10-NOMEX insulating paper; A-incoming end, X1, X2-outgoing end.

Detailed ways

The embodiments of the present invention will be further described below with reference to the accompanying drawings.

A specific embodiment of the oil-immersed coupled reactor of the present invention, as shown in FIG. 1 , the oil-immersed coupled reactor includes a box, a reactor body 4 installed in the box 1 and a transformer oil filled in the box 1 . The box body 1 is made of 304 non-magnetic stainless steel material, which effectively reduces the eddy current generated by magnetic flux leakage. There are radiating oil pipes 3 around the box 1. The radiating oil pipes 3 are provided with heat sinks or bellows to increase the heat dissipation area, and the oil in the box 1 and the radiating oil pipes 3 are provided with forced circulation through the oil pump and other devices. The driving force can be used to dissipate the operating heat to the greatest extent through the oil pipe to ensure the temperature rise of the product; the box cover is provided with an insulating sleeve support frame, which is used to support the insulating sleeve 2 so as to lead the lead wires on the body out of the box 1. For wiring, there is an insulating sleeve 2 on the support frame, and the insulating sleeve 2 reserves a sufficient safety distance. The insulating sleeve 2 is arranged in three rows, and each row includes three insulating sleeves, corresponding to each The incoming line end and two outgoing line ends of the phase circuit ensure sufficient safety distance between incoming and outgoing lines and between phases to meet insulation requirements, and then lead to the top of the box cover. All connections and seals on box 1 are sealed with oil-resistant silicone rubber to prevent oil leakage.

Transformer oil uses vegetable oil 5, which has better adsorption than conventional mineral oil, keeps the coil dry, improves electrical performance, and is more environmentally friendly due to its decomposability; in order to prevent vegetable oil 5 from burning, use higher ignition point. Vegetable oil 5, or adding a flame retardant solvent or the like to the vegetable oil 5.

As shown in Figure 2-3, the reactor body 4 adopts a three-phase integrated iron core structure, and the three-phase pattern is arranged to save space to the greatest extent. Each body has a three-phase coil winding 7, that is, includes three iron core columns 8 and double-winding coils distributed on the upper and lower sides of each core column 8. As shown in FIG. 5, the double-winding coil includes a first coil 71 and a second coil 71. In the coil 72, the first and second coils are arranged side by side in the same direction along the length direction of the core column 8, and the winding directions of the two coils are the same. The opposite ends are also connected to each other to form the outlet ends X1 and X2, so that the two coils are connected in parallel. When the oil-immersed coupled reactor is in use: the currents of the two branches are basically the same during normal operation, and the magnetic fluxes generated in the core column 8 are approximately equal, but in opposite directions, and the overall induced voltage drop is very small, thereby reducing the voltage of the line Loss; when the outgoing line of one branch is short-circuited, the magnetic flux generated by the short-circuit current is much larger than the magnetic flux generated by the normal operating current of the other branch, and the branch thus exhibits high impedance characteristics and has the effect of limiting the short-circuit current. The iron core column 8 adopts a multi-air gap segmented structure. The oil-immersed coupling reactor also includes an iron yoke 6 connecting the three-phase coil components. The iron yoke 6 adopts a coiled ring structure, which is different from the laminated iron yoke structure. the magnetic path of the device. The iron core material is made of low-loss, high-performance cold-rolled silicon steel sheet, which is beneficial to reduce iron loss; the iron core column 8 is vacuum-cast as a whole to reduce noise. The iron yoke 6 and the iron core column 8 are double-pressed by the central screw 9 and the outer screw. Reduce core vibration.

The first and second coils adopt a pie structure. There is a certain distance between the pie and the pie and the circuit is connected. The distance between the pie and the pie serves as an oil passage, that is, an electrical insulation isolation and a heat dissipation channel. The inside and outside of each cake of the coil winding 7 is wrapped with NOMEX insulating paper 10 to further improve the electrical insulation strength.

In other embodiments: the first coil and the second coil as shown in FIG. 5 may be one coil, but an incoming wire end A is connected at the middle position of the coil, so that the upper and lower parts of the coil are respectively connected to each other. The currents of the same size and opposite directions are injected, so that two magnetic fluxes of substantially the same size, symmetrical distribution, and opposite directions are formed in the iron core column to cancel each other out of the magnetic field. The winding method of the coil is wound in one direction on the iron core column. After the winding is completed, the coil can be regarded as two coils by connecting the incoming wire end in the middle of the coil.

The embodiments of the coil assembly of the present invention are the same as the coil assemblies in the embodiments of the oil-immersed coupled reactor of the present invention, and will not be repeated.

Claims (10)

1. A coil assembly, including an iron core, is characterized in that it also includes first and second coils that are juxtaposedly sleeved on the iron core along the length direction of the iron core. The winding directions of the first and second coils are the same, and the two coils are mutually The close ends are connected to each other to form the incoming end, and the ends of the two coils away from each other are connected to each other to form the outgoing end; when energized, magnetic fluxes of equal size and opposite directions are formed between the first and second coils for coupling to reduce circuit voltage loss ; When any branch connected to the two coils is short-circuited, the coil corresponding to the short-circuit branch generates a magnetic flux much larger than that of the other coil to limit the short-circuit current. 2 . The coil assembly according to claim 1 , wherein the first coil and/or the second coil is a pie-shaped structure, and the pie-shaped structures are arranged at intervals. 3 . 3 . The coil assembly according to claim 2 , wherein the first and second coils are insulated by wrapping the inner and outer sides with NOMEX paper. 4 . 4. The coil assembly according to any one of claims 1-3, wherein the iron core is a segmented structure, and the segments are arranged at intervals. 5 . The coil assembly according to claim 4 , wherein each segment of the iron core is formed into an integrated structure by vacuum casting technology. 6 . 6. An oil-immersed coupled reactor, including a box body and a coil assembly installed in the box body, the box body is filled with insulating oil, and the coil assembly includes an iron core, which is characterized in that the coil assembly also includes parallel sleeves along the length direction of the iron core. For the first and second coils on the iron core, the winding directions of the first and second coils are the same. The ends of the two coils that are close to each other are connected to each other to form the incoming end, and the ends of the two coils that are away from each other are connected to each other to form the outgoing end. When the first and second coils form magnetic fluxes of equal size and opposite directions for coupling to reduce the voltage loss of the circuit; when any branch connected to the two coils is short-circuited, the coil corresponding to the short-circuit branch will generate far greater The short-circuit current is limited by the magnetic flux of the other coil. 7 . The oil-immersed coupled reactor according to claim 6 , wherein the first coil and/or the second coil is a pie-shaped structure, and each pie-shaped structure is arranged at intervals. 8 . 8 . The oil-immersed coupled reactor according to claim 7 , wherein the first and second coils are insulated by wrapping the inner and outer sides with NOMEX paper. 9 . 9 . The oil-immersed coupling reactor according to claim 6 , wherein the iron core is a segmented structure, and the segments are arranged at intervals. 10 . 10 . The oil-immersed coupled reactor according to claim 9 , wherein each segment of the iron core forms an integrated structure through vacuum casting technology. 11 .