CN104953909B - The middle pressure pressure regulation method and power auto-transformer of power auto-transformer - Google Patents
The middle pressure pressure regulation method and power auto-transformer of power auto-transformer Download PDFInfo
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Abstract
Middle pressure pressure regulation method and power auto-transformer, this method the invention discloses a kind of power auto-transformer include：Booster transformer is concatenated on main transformer, booster transformer includes the second core limb and supercharging winding and field winding, and supercharging winding is concatenated with public winding, the head end of supercharging winding is made to connect middle extrusion thread casing；Each tap contact of tap switch lifts one's head with each shelves of tap-changing windings tap be connected respectively；Or each tap contact of tap switch taps to lift one's head and be connected with each shelves of low pressure winding respectively；Voltage is added to main transformer, and the head end of field winding and tail end is made to be connected respectively with the dynamic and static contact of tap switch, by the gear for changing tap switch, different voltage can be added to field winding, the voltage of supercharging winding changes correspondingly, to realize the middle pressure pressure regulation to power auto-transformer.Using voltage regulating mode of the present invention, the voltage class of tap changer and pressure regulation tap lead can be substantially reduced, and reduces production cost.
Description
Technical Field
The invention belongs to the technical field of transformers, and relates to a medium-voltage regulating method of a power autotransformer and the power autotransformer.
Background
For the ultrahigh voltage autotransformer with the medium voltage side voltage grade equal to or higher than 400kV grade, because the voltage grade of the medium voltage side is too high, if a conventional voltage regulating mode is adopted, no switch for regulating voltage can be selected; at the same time, the design and manufacturing difficulties of the voltage regulation leads can be very high because the voltage level on the medium voltage side is too high.
The current ultrahigh voltage autotransformer usually adopts a variable flux voltage regulation mode of regulating at a neutral point (namely, the neutral point is provided with a voltage regulation winding), the relative voltage regulation capacity is large, the stage capacity of a voltage regulation switch is also overlarge, the voltage regulation switch is not easy to select, and the switch purchase cost is also greatly improved; in addition, the voltage of the low-voltage winding can fluctuate greatly by adopting the variable magnetic flux voltage regulation mode. If the low-voltage winding of the transformer is provided with a reactive power compensation device or is provided with a load, a compensation coil needs to be additionally arranged to stabilize the voltage of the low-voltage winding, so that the manufacturing cost and the manufacturing difficulty are further increased.
Disclosure of Invention
The invention aims to solve the technical problem of providing a medium-voltage regulating method of a power autotransformer and the power autotransformer aiming at the defects in the prior art.
The technical scheme adopted for solving the technical problem is the medium-voltage regulating method of the power autotransformer, the power autotransformer comprises a main transformer, the main transformer comprises a first core limb, and a series winding, a common winding and a low-voltage winding which are wound on the first core limb, wherein the voltage regulating method comprises the following steps:
a booster transformer is connected on the main transformer in series, the booster transformer comprises a second iron core column, a booster winding and an excitation winding, the booster winding and the excitation winding are wound on the second iron core column, the booster winding is connected with a common winding in series, and the head end of the booster winding is connected with a middle extrusion line sleeve;
winding a voltage regulating winding on a first iron core column of a main transformer, and respectively connecting each tapping contact of a tapping switch with each gear tapping outlet of the voltage regulating winding; or, the low-voltage winding is simultaneously used as a voltage regulating winding, and each tapping contact of the tapping switch is respectively connected with each gear tapping outlet of the low-voltage winding;
the voltage is applied to the main transformer, the head end and the tail end of the exciting winding are respectively connected with the movable contact and the fixed contact of the tap switch, different voltages can be applied to the exciting winding on the second iron core column by changing the gear of the tap switch, and the voltage of the boosting winding on the second iron core column is correspondingly changed, so that the medium-voltage regulation of the power autotransformer is realized.
Preferably, in the main transformer, the low-voltage winding, the voltage regulating winding, the common winding and the series winding are sequentially wound on the first core limb from inside to outside; or,
the voltage regulating winding, the low-voltage winding, the common winding and the series winding are sequentially wound on the first iron core column from inside to outside; or,
the low-voltage winding, the common winding and the series winding are sequentially wound on the first iron core column from inside to outside.
Preferably, the electric autotransformer further comprises an iron core, the booster transformer and the main transformer share the iron core, and the first iron core leg and the second iron core leg are two different iron core legs on the iron core; or the main transformer further comprises a main iron core, the first iron core column is an iron core column in the main iron core, the booster transformer further comprises a voltage regulating iron core, and the second iron core column is an iron core column in the voltage regulating iron core.
Preferably, the main transformer is a single-phase transformer, and correspondingly, the booster transformer is also a single-phase transformer; or, the main transformer is a three-phase transformer, and correspondingly, the booster transformer is also a three-phase transformer.
The invention also provides an electric power autotransformer, which comprises a main transformer, wherein the main transformer comprises a first iron core column, a series winding, a common winding and a low-voltage winding which are wound on the first iron core column, the electric power autotransformer also comprises a voltage regulating unit, the voltage regulating unit comprises a tap switch and a booster transformer which is connected with the main transformer in series,
the boosting transformer comprises a second iron core column, a boosting winding and an excitation winding, wherein the boosting winding and the excitation winding are wound on the second iron core column, the boosting winding is connected with the common winding in series, and the head end of the boosting winding is connected with the middle wire-out sleeve;
each tapping contact of the tapping switch is respectively connected with each tapping outlet of the low-voltage winding; the head end and the tail end of the excitation winding are respectively connected with the movable contact and the fixed contact of the tap switch.
Preferably, in the main transformer, the low voltage winding, the common winding and the series winding are sequentially wound on the first core limb from inside to outside.
Or the electric power autotransformer comprises a main transformer, the main transformer comprises a first core limb, and a series winding, a common winding and a low-voltage winding which are wound on the first core limb, the electric power autotransformer also comprises a voltage regulating unit, the voltage regulating unit comprises a voltage regulating winding, a tap switch and a booster transformer which is connected with the main transformer in series,
the boosting transformer comprises a second iron core column, a boosting winding and an excitation winding, wherein the boosting winding and the excitation winding are wound on the second iron core column, the boosting winding is connected with the common winding in series, and the head end of the boosting winding is connected with the middle wire-out sleeve;
the voltage regulating winding is wound on a first iron core column of the main transformer,
each tapping contact of the tapping switch is respectively connected with each tapping outlet of the voltage regulating winding; the head end and the tail end of the excitation winding can be respectively connected with a movable contact and a fixed contact of the tap switch.
Preferably, in the main transformer, the low-voltage winding, the voltage regulating winding, the common winding and the series winding are sequentially wound on the first core limb from inside to outside; or,
the voltage regulating winding, the low-voltage winding, the common winding and the series winding are sequentially wound on the first iron core column from inside to outside.
Preferably, the electric autotransformer further comprises an iron core, the booster transformer and the main transformer share the iron core, and the first iron core leg and the second iron core leg are two different iron core legs on the iron core; or the main transformer further comprises a main iron core, the first iron core column is an iron core column in the main iron core, the booster transformer further comprises a voltage regulating iron core, and the second iron core column is an iron core column in the voltage regulating iron core.
Preferably, the main transformer is a single-phase transformer, and correspondingly, the booster transformer is also a single-phase transformer; or, the main transformer is a three-phase transformer, and correspondingly, the booster transformer is also a three-phase transformer.
In the voltage regulating mode, the main magnetic flux of the iron core of the main transformer is basically constant, so the voltage of the low-voltage winding is hardly fluctuated by the voltage regulation. By adopting the voltage regulating mode, the voltage grade of the voltage regulating switch (namely the tap switch) and the voltage regulating tap lead (the lead connected with the voltage regulating tap of the tap switch) is greatly reduced, so that the medium voltage of the ultrahigh voltage autotransformer can be regulated by selecting the existing voltage regulating switch.
The voltage regulating method is suitable for the power autotransformer, is particularly suitable for the high-voltage or ultrahigh-voltage power transformer, and is particularly suitable for the ultrahigh-voltage power autotransformer with the voltage of a medium-voltage side more than or equal to 400 kV.
Drawings
Fig. 1 is a schematic diagram of the wiring of a power autotransformer in embodiment 1 of the present invention;
fig. 2 is a schematic diagram of the wiring of the electric autotransformer in embodiment 2 of the present invention;
FIG. 3 is a schematic diagram of an electrical autotransformer of the present invention in the form of a single-phase transformer core;
fig. 4 is a schematic diagram of another core configuration of the electric autotransformer of the present invention applied to a single-phase transformer.
In the figure: 1-a series winding; 2-a common winding; 3-a low voltage winding; 4-excitation winding; 5-a boost winding; 6-voltage regulating winding; 7-iron core; 8-a first core leg; 9-a second core limb; 10-a main core; 11-voltage regulating iron core.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The voltage regulating method of the invention introduces the voltage regulating unit which can specifically comprise a boosting transformer which can be a single-phase transformer or a three-phase transformer (three-phase integrated transformer), namely, a winding with voltage regulating function is led out from the main transformer, the excitation winding of the boosting transformer is pressurized, the tail end of the boosting winding of the boosting transformer is connected with the head end of the common winding of the main transformer in series, and the head end of the boosting winding is connected with the middle voltage outlet bushing, namely, the voltage of the head end of the boosting winding is the middle voltage of the power autotransformer. The medium-voltage end of the main transformer is pressurized by changing the excitation voltage, so that the medium-voltage end is regulated. The booster transformer can share one iron core with the main transformer, and can also be independently provided with the iron core, namely, an iron core can be additionally and independently arranged outside the main transformer to be used as the iron core of the booster transformer.
The invention provides a medium-voltage regulating method of a power autotransformer, wherein the power autotransformer comprises a main transformer, the main transformer comprises a first core limb, and a series winding, a common winding and a low-voltage winding which are wound on the first core limb, and the voltage regulating method comprises the following steps:
a booster transformer is connected on the main transformer in series, the booster transformer comprises a second iron core column, a booster winding and an excitation winding, the booster winding and the excitation winding are wound on the second iron core column, the booster winding is connected with a common winding in series, and the head end of the booster winding is connected with a middle extrusion line sleeve;
winding a voltage regulating winding on a first iron core column of a main transformer, and respectively connecting each tapping contact of a tapping switch with each gear tapping outlet of the voltage regulating winding; or, the low-voltage winding is simultaneously used as a voltage regulating winding, the low-voltage winding comprises a multi-gear tapping head, and each tapping contact of the tapping switch is respectively connected with each gear tapping head of the low-voltage winding;
the voltage is applied to the main transformer, the head end and the tail end of the exciting winding are respectively connected with the movable contact and the fixed contact of the tap switch, different voltages can be applied to the exciting winding on the second iron core column by changing the gear of the tap switch, and the voltage of the boosting winding on the second iron core column is correspondingly changed, so that the medium-voltage regulation of the power autotransformer can be realized.
The invention also provides an electric auto-transformer, which comprises a main transformer, wherein the main transformer comprises a first core limb, a series winding, a common winding and a low-voltage winding which are wound on the first core limb, the electric auto-transformer also comprises a voltage regulating unit, the voltage regulating unit comprises a tap switch and a booster transformer which is connected with the main transformer in series,
the boosting transformer comprises a second iron core column, and a boosting winding and an excitation winding which are wound on the second iron core column, and the boosting winding is connected with the series winding in series;
each tapping contact of the tapping switch is respectively connected with each tapping outlet of the low-voltage winding; the head end and the tail end of the excitation winding can be respectively connected with a movable contact and a fixed contact of the tap switch.
Or,
the invention also provides an electric power autotransformer, which comprises a main transformer, wherein the main transformer comprises a first iron core column, a series winding, a common winding and a low-voltage winding which are wound on the first iron core column, the electric power autotransformer also comprises a voltage regulating unit, the voltage regulating unit comprises a voltage regulating winding, a tap switch and a booster transformer which is connected with the main transformer in series,
the boosting transformer comprises a second iron core column, a boosting winding and an excitation winding, wherein the boosting winding and the excitation winding are wound on the second iron core column, the boosting winding is connected with the common winding in series, and the head end of the boosting winding is connected with the middle wire-out sleeve;
the voltage regulating winding is wound on a first iron core column of the main transformer,
each tapping contact of the tapping switch is respectively connected with each tapping outlet of the voltage regulating winding; the head end and the tail end of the excitation winding can be respectively connected with a movable contact and a fixed contact of the tap switch.
In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific examples.
Example 1:
the power autotransformer applied in the medium-voltage regulation method in this embodiment is an ultra-high voltage power autotransformer, wherein the medium-voltage side voltage of the power autotransformer is 400kV, and the high-voltage side voltage thereof is 750 kV.
As shown in fig. 1, the electrical autotransformer comprises a main transformer including a first core leg (not shown) and a series winding 1, a common winding 2 and a low voltage winding 3 wound on the first core leg.
The common winding 2 forms a medium-voltage winding of the power autotransformer, and the series winding 1 and the common winding 2 are connected in series to form a high-voltage winding of the power autotransformer. The positions of the low voltage winding 3 and the common winding 2 can be interchanged. The series winding 1 is a middle outgoing line.
As shown in fig. 1, the medium-voltage regulating method of the power autotransformer provided in this embodiment specifically includes the following steps:
a booster transformer is connected in series with the main transformer, the booster transformer comprises a second iron core column (not shown in the figure) and a booster winding 5 and an excitation winding 4 wound on the second iron core column, wherein the booster winding 5 is connected in series with the common winding 2, even if the tail end of the booster winding 5 is connected with the head end of the common winding 2, the head end of the booster winding 5 is connected with a middle-voltage wire-out sleeve Am, namely the head end voltage of the booster winding 5 is the middle-voltage of the power autotransformer;
winding a voltage regulating winding on a first core limb 8 of a main transformer, and respectively connecting each tapping contact of a tapping switch (such as a tapping switch with the model number of MI-600Y-72.5/C-10193W) with each tapping outlet of the voltage regulating winding;
voltage is applied to the main transformer, the head end and the tail end of the exciting winding 4 are respectively connected with the movable contact and the fixed contact of the tap switch, different voltages are applied to the exciting winding 4 on the second iron leg by changing the gears of the tap switch, and the voltage of the booster winding 5 on the second iron leg is correspondingly changed according to the electromagnetic induction principle, so that the medium voltage of the power autotransformer can be regulated.
Wherein, there is no direct connection relation between the low voltage winding 3 and the voltage regulating winding 6.
When voltage is applied to the electric power autotransformer, a corresponding voltage value is generated between each tap of the voltage regulating winding 6, when a moving contact of a tap switch (voltage regulating switch) changes different tap positions, the exciting winding 4 can obtain corresponding different voltage values, and under the action of the voltage change of the exciting winding 4, an iron core of the booster transformer 5 can generate corresponding magnetic flux, so that under the action of electromagnetic induction, the booster winding 5 can also induce a corresponding voltage value according to the transformation ratio of the booster winding 4. Because the phases of the booster winding 5 and the common winding 2 are the same, the voltage induced by the booster winding 5 and the voltage of the common winding 2 are superposed, and the purpose of medium-voltage regulation can be achieved.
The medium-voltage regulating method in the embodiment is suitable for both the linear regulation mode and the positive and negative regulation mode. When a linear regulation mode is adopted, the specifically adopted tap changer is a linear regulation switch, for example, a linear regulation switch with the model number of MI-600Y-72.5/C-18180 is adopted; when the positive and negative regulation mode is adopted, the tap switch is a positive and negative regulation switch, for example, a positive and negative regulation switch with the model number of MI-600Y-72.5/C-10193W is adopted.
The electric autotransformer in this embodiment may be a single-phase transformer, or may be a three-phase integrated transformer. Specifically, the electric autotransformer uses a single-phase transformer, that is, the main transformer and the step-up transformer are both single-phase transformers, and accordingly, in this embodiment, the tap switch also uses a single-phase tap switch.
In this embodiment, as shown in fig. 3 and 4, schematic core structures of the electric autotransformer of the present invention are applied to two different types of single-phase transformers.
In fig. 3, the electric autotransformer further includes an iron core 7, the step-up transformer and the main transformer share the iron core 7, and the first iron core leg 8 and the second iron core leg 9 are two different iron core legs on the iron core 7, that is, the step-up transformer and the main transformer share the iron core. Specifically, the iron core 7 is specifically a four-limb iron core.
Alternatively, as shown in fig. 4, the main transformer further includes a main core 10, the first core leg 8 is a core leg in the main core 10, the step-up transformer further includes a voltage-adjusting core 11, and the second core leg 9 is a core leg in the voltage-adjusting core 11. Specifically, the main core 10 and the voltage-regulating core 11 are both three-limb cores.
In this embodiment, for the main transformer, the low-voltage winding 3, the voltage-regulating winding 6, the common winding 2 and the series winding 1 are sequentially wound on the first core limb 8 from inside to outside; alternatively, the voltage regulating winding 6, the low voltage winding 3, the common winding 2 and the series winding 1 may be wound on the first core limb 8 in sequence from inside to outside.
Example 2:
the power autotransformer applied in the medium-voltage regulation method in this embodiment is an ultra-high voltage power autotransformer, and the medium-voltage side voltage of the power autotransformer is 400kV, and the high-voltage side voltage thereof is 500 kV.
The difference between the medium-voltage regulating method in the embodiment and the embodiment 1 is that: as shown in fig. 2, in this embodiment, the voltage regulating winding is not separately disposed in the power autotransformer, but the low voltage winding in the main transformer is also used as the voltage regulating winding.
Therefore, in this embodiment, the low-voltage winding includes a multi-tap, and each tap contact of the tap switch is connected to each tap of the low-voltage winding (also referred to as a voltage-regulating winding).
Other steps of the medium-voltage regulating method in this embodiment are the same as those in embodiment 1, and are not described herein again.
Example 3:
the present embodiment provides a power autotransformer, which has a medium-voltage side voltage of 400kV and a high-voltage side voltage of 500 kV.
The common winding 2 forms a medium-voltage winding of the power autotransformer, and the series winding 1 and the common winding 2 together form a high-voltage winding of the power autotransformer.
As shown in fig. 2, the electric autotransformer comprises a main transformer, wherein the main transformer comprises a first core limb 8, a series winding 1, a common winding 2 and a low-voltage winding 3 wound on the first core limb, and a voltage regulating unit, wherein the voltage regulating unit comprises a tap switch and a booster transformer connected in series with the main transformer.
The booster transformer comprises a second iron core column 9, a booster winding 5 and an excitation winding 4, wherein the booster winding 5 and the excitation winding are wound on the second iron core column 9, the tail end of the booster winding 5 is connected with the head end of the common winding 2, and the head end of the booster winding 5 is connected with a middle wire-out sleeve Am.
In this embodiment, the low-voltage winding 3 is also used as a voltage regulating winding, so that the low-voltage winding includes a multi-tap, each tap of the tap switch is connected to each tap of the low-voltage winding 3, and the head end and the tail end of the excitation winding 4 can be connected to the moving contact and the fixed contact of the tap switch.
In this embodiment, for the main transformer, the low-voltage winding 3, the common winding 3, and the series winding 1 are wound on the first core limb 8 in this order from inside to outside. In the booster transformer, an excitation winding 4 is wound on a second iron leg 9, and a booster winding 5 is wound on the outer side of the excitation winding 4; alternatively, the boosting winding 5 may be wound around the second core limb 9, and the exciting winding 4 may be wound around the outside of the boosting winding 5.
The booster transformer and the main transformer may share one iron core, or may use different iron cores.
As shown in fig. 3, when the step-up transformer and the main transformer share one core, the electric autotransformer further includes a core 7, and the first core leg 8 and the second core leg 9 are two different core legs on the shared core 7.
Alternatively, as shown in fig. 4, when the step-up transformer and the main transformer have different iron cores, the main transformer further includes a main iron core 10, the first iron core leg is an iron core leg in the main iron core 10, the step-up transformer further includes a voltage-adjusting iron core 11, and the second iron core leg 9 is an iron core leg in the voltage-adjusting iron core 11.
In this embodiment, the power autotransformer may be a single-phase transformer or a three-phase integrated transformer. Namely, the main transformer is a single-phase transformer, and correspondingly, the booster transformer is also a single-phase transformer; or, the main transformer is a three-phase transformer, and correspondingly, the booster transformer is also a three-phase transformer.
Voltage is applied to the main transformer, the head end and the tail end of the excitation winding 4 are respectively connected with the movable contact and the fixed contact of the tap switch, different voltages are applied to the excitation winding on the second iron leg 9 by changing the gear of the tap switch, and the voltage of the booster winding on the second iron leg is changed accordingly, so that the medium voltage of the power autotransformer is regulated.
When voltage is applied to the electric power autotransformer, a corresponding voltage value is generated between each tap of the low-voltage winding 3, when a moving contact of a tap switch (a voltage regulating switch) changes different tap positions, the exciting winding 4 can obtain corresponding different voltage values, and under the action of the voltage change of the exciting winding 4, an iron core of the booster transformer can generate corresponding magnetic flux, so that under the action of electromagnetic induction, the booster winding 5 can also induce a corresponding voltage value according to the transformation ratio of the booster winding 4. Because the phases of the two are the same, the voltage induced by the boosting winding 5 and the voltage of the common winding 2 are superposed, so that the purpose of medium-voltage regulation can be achieved.
Example 4:
the present embodiment provides an extra-high voltage power autotransformer, which has a medium-voltage side voltage of 400kV and a high-voltage side voltage of 750 kV.
The power autotransformer in this embodiment differs from the power autotransformer in embodiment 3 in that: as shown in fig. 1, in this embodiment, the voltage regulating unit includes a tap switch and a step-up transformer connected in series with the main transformer, and further includes a voltage regulating winding 6, where the voltage regulating winding 6 is wound on a first core limb 8 of the main transformer.
That is, in the present embodiment, the separate voltage regulating winding 6 is included, and therefore the low voltage winding 3 is not used as the voltage regulating winding.
In the main transformer, a low-voltage winding 3, a voltage regulating winding 6, a common winding 2 and a series winding 1 are sequentially wound on a first iron core column 8 from inside to outside; alternatively, the voltage regulating winding 6, the low voltage winding 3, the common winding 2 and the series winding 1 may be wound on the first core limb 8 in sequence from inside to outside.
The booster transformer comprises a second iron core column 9, a booster winding 5 and an excitation winding 4, wherein the booster winding 5 and the excitation winding are wound on the second iron core column 9, the tail end of the booster winding 5 is connected with the head end of the common winding 2, and the head end of the booster winding 5 is connected with a middle wire-out sleeve Am.
In the booster transformer, an excitation winding 4 is wound on a second iron leg 9, and a booster winding 5 is wound on the outer side of the excitation winding 4; alternatively, the boosting winding 5 may be wound around the second core limb 9, and the exciting winding 4 may be wound around the outside of the boosting winding 5.
In this embodiment, each tapping contact of the tapping switch is connected with each tap outlet of the voltage regulating winding 6; the head end and the tail end of the excitation winding 4 can be respectively connected with a movable contact and a fixed contact of the tap switch.
Voltage is applied to the main transformer, the head end and the tail end of the excitation winding 4 are respectively connected with the movable contact and the fixed contact of the tap switch, different voltages are applied to the excitation winding on the second iron leg 9 by changing the gear of the tap switch, and the voltage of the booster winding on the second iron leg is changed accordingly, so that the medium voltage of the power autotransformer is regulated.
When voltage is applied to the electric power autotransformer, a corresponding voltage value is generated between each tap of the voltage regulating winding 6, when a moving contact of a tap switch (voltage regulating switch) changes different tap positions, the exciting winding 4 can obtain corresponding different voltage values, and under the action of the voltage change of the exciting winding 4, an iron core of the booster transformer can generate corresponding magnetic flux, so that under the action of electromagnetic induction, the booster winding 5 can also induce a corresponding voltage value according to the transformation ratio of the booster winding 4. Because the phases of the booster winding and the common winding are the same, the voltage induced by the booster winding 5 and the voltage of the common winding 2 are superposed, so that the purpose of medium-voltage regulation can be achieved.
The other structures of the power autotransformer in this embodiment are the same as those in embodiment 3, and are not described again here.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (8)
1. A medium voltage regulating method of an electric power autotransformer, the electric power autotransformer comprising a main transformer, the main transformer comprising a first core leg and a series winding, a common winding and a low voltage winding wound on the first core leg, the regulating method comprising the steps of:
a booster transformer is connected on the main transformer in series, the booster transformer comprises a second iron core column, a booster winding and an excitation winding, the booster winding and the excitation winding are wound on the second iron core column, the booster winding is connected with a common winding in series, and the head end of the booster winding is connected with a middle extrusion line sleeve; the phases of the booster winding and the common winding are the same, so that the voltage induced by the booster winding and the voltage of the common winding are superposed;
winding a voltage regulating winding on a first iron core column of a main transformer, and respectively connecting each tapping contact of a tapping switch with each gear tapping outlet of the voltage regulating winding; or, the low-voltage winding is simultaneously used as a voltage regulating winding, and each tapping contact of the tapping switch is respectively connected with each gear tapping outlet of the low-voltage winding;
applying voltage to the main transformer, and respectively connecting the head end and the tail end of the excitation winding with the movable contact and the fixed contact of the tap switch, wherein different voltages can be applied to the excitation winding on the second iron leg by changing the gear of the tap switch, and the voltage of the booster winding on the second iron leg is correspondingly changed, so as to realize medium-voltage regulation of the power autotransformer;
the electric power autotransformer further comprises an iron core, the booster transformer and the main transformer share the iron core, and the first iron core column and the second iron core column are two different iron core columns on the iron core.
2. The method of claim 1, wherein in the main transformer, the low voltage winding, the regulating winding, the common winding, and the series winding are sequentially wound on the first leg core in an inside-out order; or,
the voltage regulating winding, the low-voltage winding, the common winding and the series winding are sequentially wound on the first iron core column from inside to outside; or,
the low-voltage winding, the common winding and the series winding are sequentially wound on the first iron core column from inside to outside.
3. The method according to any one of claims 1 to 2, wherein the main transformer is a single-phase transformer, and correspondingly, the step-up transformer is a single-phase transformer; or, the main transformer is a three-phase transformer, and correspondingly, the booster transformer is also a three-phase transformer.
4. An electric auto-transformer comprises a main transformer, wherein the main transformer comprises a first core limb, and a series winding, a common winding and a low-voltage winding which are wound on the first core limb, and is characterized by further comprising a voltage regulating unit, the voltage regulating unit comprises a tap switch and a booster transformer which is connected with the main transformer in series,
the boosting transformer comprises a second iron core column, a boosting winding and an excitation winding, wherein the boosting winding and the excitation winding are wound on the second iron core column, the boosting winding is connected with the common winding in series, and the head end of the boosting winding is connected with the middle wire-out sleeve; the phases of the booster winding and the common winding are the same, so that the voltage induced by the booster winding and the voltage of the common winding are superposed;
each tapping contact of the tapping switch is respectively connected with each tapping outlet of the low-voltage winding; the head end and the tail end of the excitation winding are respectively connected with a movable contact and a fixed contact of the tap switch;
the electric power autotransformer further comprises an iron core, the booster transformer and the main transformer share the iron core, and the first iron core column and the second iron core column are two different iron core columns on the iron core.
5. The electrical autotransformer of claim 4,
in the main transformer, a low-voltage winding, a common winding and a series winding are sequentially wound on a first core limb from inside to outside.
6. An electric power autotransformer comprises a main transformer, wherein the main transformer comprises a first core limb, and a series winding, a common winding and a low-voltage winding which are wound on the first core limb, and is characterized by further comprising a voltage regulating unit, the voltage regulating unit comprises a voltage regulating winding, a tap switch and a booster transformer which is connected with the main transformer in series,
the boosting transformer comprises a second iron core column, a boosting winding and an excitation winding, wherein the boosting winding and the excitation winding are wound on the second iron core column, the boosting winding is connected with the common winding in series, and the head end of the boosting winding is connected with the middle wire-out sleeve; the phases of the booster winding and the common winding are the same, so that the voltage induced by the booster winding and the voltage of the common winding are superposed;
the voltage regulating winding is wound on a first iron core column of the main transformer,
each tapping contact of the tapping switch is respectively connected with each tapping outlet of the voltage regulating winding; the head end and the tail end of the excitation winding can be respectively connected with a movable contact and a fixed contact of the tap switch;
the electric power autotransformer further comprises an iron core, the booster transformer and the main transformer share the iron core, and the first iron core column and the second iron core column are two different iron core columns on the iron core.
7. The electrical autotransformer of claim 6,
in the main transformer, a low-voltage winding, a voltage regulating winding, a common winding and a series winding are sequentially wound on a first core limb from inside to outside; or,
the voltage regulating winding, the low-voltage winding, the common winding and the series winding are sequentially wound on the first iron core column from inside to outside.
8. A power autotransformer according to any one of claims 4 to 7 wherein the main transformer is a single phase transformer and correspondingly the step-up transformer is a single phase transformer; or, the main transformer is a three-phase transformer, and correspondingly, the booster transformer is also a three-phase transformer.
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| CN106841875B (en) * | 2017-03-01 | 2024-05-03 | 国家电网公司 | Three-phase distribution transformer temperature rise test system and method based on alternating-current low-frequency heating |
| CN108711498A (en) * | 2017-08-17 | 2018-10-26 | 周瑞军 | A kind of adjusting method of the flexible adjustable auto-transformer of damping of carbon brush body |
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| JPS6081811A (en) * | 1983-10-11 | 1985-05-09 | Meidensha Electric Mfg Co Ltd | On-load tap changing autotransformer |
| CN101256891A (en) * | 2007-12-28 | 2008-09-03 | 保定天威集团有限公司 | Extra-high voltage single-phase autotransformer |
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| JPS6081811A (en) * | 1983-10-11 | 1985-05-09 | Meidensha Electric Mfg Co Ltd | On-load tap changing autotransformer |
| CN101256891A (en) * | 2007-12-28 | 2008-09-03 | 保定天威集团有限公司 | Extra-high voltage single-phase autotransformer |
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