CN212010684U - Transformer device - Google Patents
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- CN212010684U CN212010684U CN202020516181.4U CN202020516181U CN212010684U CN 212010684 U CN212010684 U CN 212010684U CN 202020516181 U CN202020516181 U CN 202020516181U CN 212010684 U CN212010684 U CN 212010684U
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- 239000003921 oil Substances 0.000 description 7
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Abstract
The utility model discloses a transformer, include: at least one magnetic core, wherein at least one group of windings are distributed on the magnetic core; the windings each comprise an input coil and an output coil; the output coil comprises a first outgoing line branch and a second outgoing line branch; the first outgoing line branch and the second outgoing line branch are connected in parallel. The utility model discloses can increase the distribution capacity of low pressure side to improve the distribution ability of low pressure side.
Description
Technical Field
The utility model belongs to the technical field of the transformer and specifically relates to a transformer is related to.
Background
The construction and transformation of the power distribution network are the precondition for the structural transformation of the power supply side and the precondition and the foundation for power consumption optimization. At present, with the advance of novel urbanization construction, higher requirements are put forward on the power supply capacity and the power supply reliability of a power distribution network, particularly a town power distribution network, and with the continuous increase of the demand of residents on electric power, the problems of weak power supply capacity and unstable power supply are more and more prominent.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a transformer can increase the distribution capacity of low pressure side to improve the distribution ability of low pressure side.
An embodiment of the utility model provides a transformer: the method comprises the following steps:
at least one magnetic core, wherein at least one group of windings are distributed on the magnetic core;
the windings each comprise an input coil and an output coil;
the output coil comprises a first outgoing line branch and a second outgoing line branch;
the first outgoing line branch and the second outgoing line branch are connected in parallel.
The utility model discloses transformer has following beneficial effect at least: the method can increase the way of outgoing lines on the output coil, thereby increasing the power distribution capacity of the low-voltage side and improving the power distribution capacity of the low-voltage side.
According to the utility model discloses a transformer of other embodiments, the first branch road of being qualified for the next round of competitions with the capacity sum of the second branch road of being qualified for the next round of competitions equals output coil's capacity.
The transformer of the embodiment has at least the following beneficial effects: the configuration capacity of the output coil can be guaranteed to be fully used for power distribution of the first outgoing line branch and the second outgoing line branch, and the power distribution capacity of the low-voltage side is improved.
The capacities of the first outgoing line branch and the second outgoing line branch can be adjusted by adjusting the outgoing line branch positions of the output coil.
The embodiment has at least the following beneficial effects: the capacities of the first appearance branch and the second appearance branch can be adjusted according to the positions of the selected appearance branches, and various different scene requirements are met.
According to other embodiments of the present invention, the transformer further comprises a transformer coil.
The embodiment has at least the following beneficial effects: the capacity of the third winding can be configured according to the practical application scene and the low-voltage side load power distribution capacity of the main transformer, so that the power distribution safety is ensured.
According to other embodiments of the present invention, the transformer, the capacity of the output coil is 1/2 of the total capacity of the transformer.
The embodiment has at least the following beneficial effects: the capacity of the output coil can be improved within a reasonable capacity range, so that the power distribution capacity of the transformer is improved.
According to other embodiments of the present invention, the transformer, the input coil comprises a high voltage coil, and the output coil comprises a medium voltage coil and/or a low voltage coil.
The embodiment has at least the following beneficial effects: the output power distribution is carried out according to different power distribution scenes of the low-voltage side, and the practicability of the power distribution is improved.
According to the utility model discloses a transformer of other embodiments, the magnetic core is silicon steel sheet structure.
The embodiment has at least the following beneficial effects: the silicon steel is a magnetic substance with strong magnetic conductivity, and can generate larger magnetic induction intensity in an electrified coil, so that the volume of the transformer can be reduced, and the transformer is formed in a mode of overlapping in pieces, so that the resistance value in the direction perpendicular to the magnetic force line can be increased, and the vortex loss is reduced.
According to other embodiments of the present invention, the transformer further comprises a bushing, the bushing comprises a high voltage bushing, a medium voltage bushing, and a low voltage bushing.
The embodiment has at least the following beneficial effects: increase transformer output factor of safety, satisfy different load demands simultaneously, increase transformer distribution and be suitable for the occasion, increase the practicality.
Drawings
Fig. 1 is a schematic diagram of the wiring of a transformer in an embodiment of the present invention;
fig. 2 is a sectional view of the transformer in the embodiment of the present invention.
Detailed Description
The conception and the resulting technical effects of the present invention will be described clearly and completely with reference to the following embodiments, so that the objects, features and effects of the present invention can be fully understood. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention.
In the description of the present invention, if an orientation description is referred to, for example, the directions or positional relationships indicated by "upper", "lower", "front", "rear", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, only for convenience of description and simplification of description, and it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. If a feature is referred to as being "disposed," "secured," "connected," or "mounted" to another feature, it can be directly disposed, secured, or connected to the other feature or indirectly disposed, secured, connected, or mounted to the other feature.
In the description of the embodiments of the present invention, if "a plurality" is referred to, it means one or more, if "a plurality" is referred to, it means two or more, if "greater than", "less than" or "more than" is referred to, it is understood that the number is not included, and if "more than", "less than" or "within" is referred to, it is understood that the number is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.
In an embodiment of the present invention, the transformer includes at least one magnetic core, wherein at least one set of windings is distributed on the magnetic core; the windings comprise input coils and output coils; the output coil comprises a first outgoing line branch and a second outgoing line branch; the first outgoing line branch and the second outgoing line branch are connected in parallel. In order to facilitate understanding of the technical solution of the present embodiment, three magnetic cores are taken as an example for explanation below, and a winding is distributed on each of the three magnetic cores, that is, each magnetic core has a set of windings, each winding includes an input coil and an output coil, and the output coil includes a medium voltage coil and/or a low voltage coil.
Specifically, refer to fig. 1, which is a schematic diagram of the transformer according to the embodiment of the present invention. As shown in fig. 1, the transformer includes a high voltage coil 100, a medium voltage coil 200, and a low voltage coil 300. In practical applications, the main transformer is connected to the high-voltage coil 100, and the medium-voltage coil 200 and the low-voltage coil 300 generate current through electromagnetic induction, wherein the low-voltage coil 300 is drawn from a middle point to form two parallel outgoing line branches, which are respectively defined as a first outgoing line branch and a second outgoing line branch. The high-voltage coil connected with the power supply can also be called as a primary coil, and the rest coils are secondary coils.
Specifically, because two outgoing line branches are in a parallel relationship, the sum of the capacities of the first outgoing line branch and the second outgoing line branch is equal to the capacity of the output coil, and more specifically, a low-voltage coil is taken as an example for explanation, in this embodiment, the magnetic core and the winding inside the transformer include a first magnetic core, a second magnetic core, a third magnetic core, a first winding, a second winding, and a third winding, and the first magnetic core, the second magnetic core, and the third magnetic core are respectively distributed with a first winding, a second winding, and a third winding; the first winding, the second winding and the third winding respectively comprise a high-voltage coil, a medium-voltage coil and a low-voltage coil, wherein the low-voltage coil comprises a first outgoing line branch and a second outgoing line branch, the two outgoing line branches can share the same magnetic core, and the sum of the capacities of the first outgoing line branch and the second outgoing line branch is the capacity of the low-voltage coil.
It is understood that the winding may also be referred to as a coil, but since the winding includes at least three coils of high voltage, medium voltage and low voltage, the winding is divided into a high voltage coil, a medium voltage coil and a low voltage coil in this embodiment for clarity of description.
It can be understood that the larger the capacity of the low-voltage coil is, the stronger the power distribution capability thereof is, and the capacity of the low-voltage coil can be calculated by using the following formula:
wherein, P represents the total power of the low-voltage coil and can also be called as the total capacity of the low-voltage coil, U is the voltage of the low-voltage coil, I is the total current of the low-voltage coil, and COS phi is a power factor, wherein COS phi satisfies the condition that COS phi is more than or equal to 0.9 and less than or equal to 1.
In order to more clearly express the effect of the low voltage coil capacity, the capacity of the low voltage coil is described below as a low voltage side capacity.
The capacities of the first outgoing line branch and the second outgoing line branch can be adjusted, specifically, in this embodiment, the low-voltage coil is used as the output coil, and the capacity of the low-voltage coil is configurable, and in this embodiment, the low-voltage coil is configured to be 1/2 of the total capacity of the transformer, and it can be understood that the medium-voltage coil is also applicable to be used as the output coil.
The capacities of the first outgoing line branch and the second outgoing line branch can be adjusted, but an optimal mode is selected in the embodiment, namely the turn ratio of the two outgoing line branches on the magnetic core is 1:1, namely the outgoing line is performed at the central point of the low-voltage coil, but other proportional modes can be selected, and the reasonable design is only performed according to the practical application scene and the reasonable maximum capacity in the embodiment.
The magnetic core that chooses for use in this embodiment is silicon steel sheet structure, and the reason lies in silicon steel sheet structure resistivity is higher to the silicon steel sheet constitutes for a slice superimposed mode, consequently can increase the ascending resistance value of perpendicular magnetic force line, reduces the vortex loss, if according to the monoblock as the magnetic core, then the resistance value in perpendicular magnetic force line direction is very little, and the vortex can be very big, and the loss ratio structure in this embodiment can increase greatly, thereby causes unnecessary cost waste.
It is understood that due to the condition limitation, the capacity of the third winding of the conventional transformer is generally configured to be 1/3 of the capacity of the main transformer, for example, the capacity of the main transformer is 240MVA, and the ratio of the capacities among the high-voltage coil, the medium-voltage coil and the low-voltage coil of the conventional transformer is generally 240:240:80, which is expressed in MVA; however, in this embodiment, the capacity of the third winding may be configured to be 1/2 of the total capacity, that is, the ratio of the capacities among the high-voltage coil, the medium-voltage coil and the low-voltage coil is generally 240:240:120, which is expressed by MVA, and it can be seen from the comparison of the above numerical values that the power distribution capacity is significantly improved on the low-voltage side, that is, the power distribution capacity is improved from 80MVA to 120MVA before, but no additional investment cost is added, such as the need to add a magnetic core or an auxiliary power facility.
More specifically, in practical power distribution applications, because different circuit breakers selected on a bus line may have a certain limiting effect on the capacity of low-voltage side power distribution, the rated current of a conventional circuit breaker does not exceed 4000A, and this embodiment describes advantages of this solution by taking the maximum rated current 4000A of the circuit breaker as an example, for example, the maximum rated current of the circuit breaker is 4000A, the rated voltage is 10kV, the voltage of the main transformer is 220kV, the voltage class of the main transformer is 220/110/10, the unit of the voltage is all kV, at this time, the capacity of low-voltage side power distribution is maximum 69MVA, and more specifically, the above MVA 69 calculation process is that the above MVA 69 is calculated
In the formula, the U is the rated voltage of a low-voltage side of 10kV, the I is the maximum rated current of a circuit breaker of 4000A, and the power factor COS phi is the result obtained when the maximum value is 1, the obtained maximum passing capacity is 69.28MVA, and the maximum passing capacity is rounded to the maximum capacity of 69 MVA. It can be understood that, the above-mentioned 120MVA electric energy is respectively distributed with 60MVA electric energy on the two branch lines, and does not exceed the maximum passing capacity, and the electric energy can be supplied to the electric equipment without loss, so that, in the case of using the circuit breaker commonly used in the power industry, the present embodiment can greatly increase the low-voltage side distribution capacity, and directly improve the low-voltage side distribution capacity.
The capacity of the low-voltage side of the traditional main transformer is distributed according to one third of the capacity of the main transformer, namely the capacity distribution of the main transformer is 240:240:80, and the unit is MVA, but the capacity of the low-voltage side which can be passed by the circuit breaker under the normal operation condition is only about 69MVA, so that the low-voltage side power distribution capacity is influenced.
More specifically, in this embodiment, the capacity of the third winding is one half of the capacity of the main transformer, so as to completely meet the power distribution requirement of high capacity, specifically, the low-voltage coil is adopted in this embodiment, and includes the first outgoing line branch and the second outgoing line branch, and the sum of the capacities of the first outgoing line branch and the second outgoing line branch is the capacity of the low-voltage coil, as can be understood, at this time, since the total capacity of the low-voltage coil is one half of 240MVA, that is, 120MVA, and the low-voltage coil is divided into the two outgoing line branches, each outgoing line branch can be allocated with a certain proportion of capacity;
in this embodiment, the impedance ratios of the two outgoing lines are equal, that is, each outgoing line branch can allocate one half of the total capacity of the low-voltage coil, that is, the capacity of each outgoing line branch is 60MVA and is smaller than the maximum capacity allowed by the circuit breaker, it can also be understood that the power distribution capacity of the low-voltage coil is increased from 80MVA to 120MVA, the number of outgoing lines and loops can also be correspondingly increased, and the increase of the power cost is not caused.
The high-voltage coil lead-in wire of the first winding is a high-voltage phase A, the high-voltage coil lead-in wire of the second winding is a high-voltage phase B, the high-voltage coil lead-in wire of the third winding is a high-voltage phase C, the medium-voltage coil lead-out wire of the first winding is a medium-voltage phase A, the medium-voltage coil lead-out wire of the second winding is a medium-voltage phase B, the medium-voltage coil lead-out wire of the third winding is a medium-voltage phase C, the first outlet branch lead-out wire of the low-voltage coil of the first winding is a low-voltage phase a1, the first outlet branch lead-out wire of the low-voltage coil of the second winding is a low-voltage phase B1, the first outlet branch lead-out wire of the low-voltage coil of the third winding is a low-voltage phase C1, the second outlet branch lead-out wire of the low-voltage coil of the first winding is a low-voltage phase a2, the second outlet branch lead-out wire.
The two outgoing line branches are directly led out on the low-voltage coil, the problem of large axial force of a traditional short circuit can be greatly improved, the capacity of the two outgoing line branches is not required to be completely the same when the outgoing line branches are distributed on the low-voltage coil, the problem of serious deviation of high-low voltage magnetic centers can be avoided due to the fact that the two outgoing line branches simultaneously use the same magnetic core, and the beneficial effect of saving cost can be achieved.
To better understand the advantages of the present embodiment, a more detailed application scenario is selected for analysis, for example: firstly, a traditional 220kV three-winding form is selected, a low-voltage side single-winding single-branch outgoing line transformer is divided into a high winding, a middle winding and a low winding, the capacity of the transformer is 240MVA, the capacity of the high-voltage winding is 240MVA, the impedance voltage is Uk12 which is 14%, the capacity of the middle-voltage winding is 240MVA, Uk23 which is 21%, the capacity of the low-voltage winding is 80MVA, and Uk13 which is 35%, a main transformer, the middle voltage and the low voltage are respectively provided with a single-winding single-branch outgoing line, Uk12 is a middle-high voltage and high-low voltage impedance voltage, Uk23 which is 21% of the middle-low voltage impedance voltage, Uk13 which is 35% of the high-low voltage impedance voltage, and the mode is a.
And the same impedance voltage configuration, the low-voltage winding capacity in this embodiment may be configured to be 120MVA, it can be understood that, if the same capacity is converted, the impedance voltage in this embodiment will be reduced in the same proportion, and meanwhile, it can be understood that the smaller the impedance voltage is, the lower the cost is, the higher the efficiency is, the lower the operating voltage drop and the voltage fluctuation rate are, and the voltage quality is easily controlled and ensured. If the impedance voltage can not be changed, the low-voltage side power distribution capacity is improved, more power setting is not needed to support capacity expansion, and the beneficial effects of saving cost and improving power distribution capacity are achieved.
In another embodiment of the present invention, referring to fig. 2, fig. 2 is a cross-sectional view of a transformer in an embodiment of the present invention, and the present embodiment is added with a bushing on the basis of the above embodiment, wherein the bushing includes a high voltage bushing, a medium voltage bushing, and a low voltage bushing.
At least one of the high-voltage phase a, the high-voltage phase B and the high-voltage phase C is connected to an ac power supply through a high-voltage bushing 400, at least one of the medium-voltage phase a, the medium-voltage phase B and the medium-voltage phase C is connected to a medium-voltage load through a medium-voltage bushing (not shown), and at least one of the low-voltage phase a1, the low-voltage phase B1, the low-voltage phase C1, the low-voltage phase a2, the low-voltage phase B2 and the low-voltage phase C2 is connected to a low-voltage load through a low-voltage bushing 500.
The low-voltage side of the main transformer adopts the single-winding double-branch outgoing line mode in the embodiment, the low-voltage side is provided with 6 low-voltage outgoing line sleeves 2000, the high-voltage coil, the medium-voltage coil and the low-voltage coil are all single windings, and the low voltage is led out by two outgoing line branches through a lead and a sleeve to be output, so that the two low-voltage outgoing line branches are independently output, the two low-voltage outgoing line branches have equal voltage and equal impedance, and the two low voltages can be output in equal capacity or unequal capacity. It can be understood that the present embodiment is a modification of a conventional transformer, and the insulating structure of the present embodiment is substantially the same as that of a high-impedance transformer of the conventional transformer, and particularly, the cost of the transformer is substantially the same as that of a conventional transformer with a single coil and a single parameter and a single low voltage, but the distribution capacity is greatly improved, and the distribution capacity of the low-voltage side of the transformer is also increased.
In practical applications, 600 in fig. 2 represents a neutral zero line, A, B, C represents an a phase, a B phase and a C phase, respectively, if the transformer is a three-phase transformer, the commonly used connection methods include a delta connection method and a star connection method, but the connection methods are not limited to the above connection methods, and the above connection methods are common in practical applications, and are also applicable to the present embodiment, but the present embodiment is not only applicable to the above connection methods, and the input and output can be flexibly applied according to practical needs, and hereinafter, taking a low-voltage side as an example, in the case of the delta connection method, three-phase power is connected end to end, a line is led out at a connection point, the delta connection method has no neutral zero point, and no neutral zero line can be led out, so that only three-phase power is provided, and after a ground line is added, the three-phase power becomes
And (4) doubling. The star connection method can also be called as Y connection method three-phase transformer, each end is connected with one phase of three-phase voltage, the other end is connected together,the star connection method is that the ends of three-phase electric coils or loads are connected together to form a neutral zero line, and the neutral zero line of balanced three-phase electricity has zero current, so the voltage of each coil is also called a zero line: and lead-out wires at the other end of the three-phase electric coil are respectively three phase wires of three-phase electricity. When the remote power transmission is carried out, only three phase lines are used, and a three-phase three-wire system is formed. The circuit to the user usually involves two voltages, 220V and 380V, and three phase lines and one zero line are needed to form a three-phase four-wire system. In order to avoid electric shock accidents caused by electric leakage, a user needs to add an earth wire, namely three phase lines, a zero line and an earth wire, and at the moment, three-phase five-line wiring can be formed, but input and output can be flexibly applied according to actual needs, and the method is not limited to a wiring mode which can be directly obtained in the embodiment.
The utility model discloses a beneficial effect is that it is qualified for the next round of competitions to be changed into single winding double branch by single winding single branch with traditional 220kV three winding transformer low pressure side is qualified for the next round of competitions, and improve to 120MVA with main transformer low pressure side capacity by the 80MVA of traditional transformer, it is big effectively to have solved main transformer low pressure side and adopted the short circuit axial force of double branch to be qualified for the next round of competitions, and must keep the problem of low pressure side simultaneous constant capacity operation, the transformer cost is reduced, main transformer low pressure side capacity has been increased, corresponding multiplicable 10kV circuit number of being qualified for the next round of competitions, the distribution ability of main transformer low pressure side has been improved, can realize gradually by the condition of transmission of electricity to the distribution conversion on.
It should be noted that, the utility model discloses an improvement that goes on the basis of traditional transformer, so the basic structure of traditional transformer constitutes and the effect that can play is in the utility model discloses in all include, for example the oil tank, the oil tank is the shell of transformer, be equipped with the utility model provides a magnetic core and winding to be full of transformer oil, make magnetic core and winding soak in oil, transformer oil can play insulating and radiating effect, but still include but not limited to regulator, cooling device, protection device, wherein regulator is tapping switch, protection device is oil conservator, safe air flue, desiccator, gas relay, oil purifier and temperature measuring device etc. the utility model discloses in above-mentioned device or device are the same with traditional transformer, no longer describe herein.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
Claims (7)
1. A transformer, comprising:
at least one magnetic core, wherein at least one group of windings are distributed on the magnetic core;
the windings each comprise an input coil and an output coil;
the output coil comprises a first outgoing line branch and a second outgoing line branch;
the first outgoing line branch and the second outgoing line branch are connected in parallel.
2. The transformer of claim 1, wherein the sum of the capacities of the first and second outgoing lines is equal to the capacity of the output winding.
3. The transformer of claim 2, wherein the capacities of the first and second outgoing lines are adjustable by adjusting the positions of the outgoing lines of the output coils.
4. A transformer according to claim 2, characterised in that the capacity of the output winding is configurable.
5. The transformer of claim 4, wherein the capacity of the output coil is configured to be 1/2 of the total capacity of the transformer.
6. A transformer according to claim 1, characterised in that the input winding comprises a high voltage winding and the output winding comprises a medium voltage winding and/or a low voltage winding.
7. The transformer of claim 1, wherein the magnetic core is a silicon steel sheet structure.
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| CN111446074A (en) * | 2020-04-09 | 2020-07-24 | 深圳供电规划设计院有限公司 | Transformer device |
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| CN111446074A (en) * | 2020-04-09 | 2020-07-24 | 深圳供电规划设计院有限公司 | Transformer device |
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