CN111326326A - Autotransformer of distribution box type transformer substation - Google Patents
Autotransformer of distribution box type transformer substation Download PDFInfo
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- CN111326326A CN111326326A CN201811531211.2A CN201811531211A CN111326326A CN 111326326 A CN111326326 A CN 111326326A CN 201811531211 A CN201811531211 A CN 201811531211A CN 111326326 A CN111326326 A CN 111326326A
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- 238000004804 winding Methods 0.000 claims abstract description 57
- 230000001105 regulatory effect Effects 0.000 claims abstract description 55
- 230000001276 controlling effect Effects 0.000 claims abstract description 4
- 230000007935 neutral effect Effects 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2823—Wires
- H01F27/2828—Construction of conductive connections, of leads
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/02—Auto-transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/12—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P13/00—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output
- H02P13/08—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output by sliding current collector along winding
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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Abstract
According to the characteristics of an urban distribution network, the head end and the tail end of a first winding of each phase of the autotransformer are connected and then connected with the head end or the tail end of an on-load voltage regulating coil through a switch, and the tail end of the on-load voltage regulating coil is used as the negative pole of the phase; the head end of the loaded voltage regulating coil is used as the anode of the phase; the head end of the second winding is used as a sliding contact and is connected with the on-load voltage regulating coil; controlling each phase of sliding contact to reach the initial position of the on-load voltage regulating coil, and detecting whether the output voltages of the leading-out ends of the first winding and the second winding respectively reach the corresponding voltage set values; if not, checking a tap position selector of the switch until the output voltage reaches a voltage set value; if so, moving the sliding contact to the next step position; and traversing all the step positions of the on-load voltage regulating coil.
Description
Technical Field
The invention relates to a control mode and a system structure of a power distribution system, in particular to an intelligent distribution box type transformer substation autotransformer for an urban power distribution network, and belongs to the technical field of power distribution of power grids.
Background
With the continuous expansion of the power supply area of the urban power grid, the line power supply load is rapidly increased. Contact and segmentation in the middle of the original 10kV distribution lines in city are constantly increased, the line structure is more and more complicated, and when the circuit with heavier load reaches the peak of power consumption at ordinary times, the switch can automatically trip. In order to adapt to the problem of large voltage fluctuation of the existing power grid, the voltage regulation of the ultrahigh-voltage autotransformer is provided.
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. There is therefore a great need for improvement.
In conventional power plant transformer type products, there are usually no series air core reactors. The transformer with high voltage to low voltage impedance and high medium voltage to low voltage impedance exists in the actual operation of the power grid, if the large impedance is met by increasing the main distance, the manufacturing cost of the transformer is increased, the transportation problem is also caused, the transformer cannot be transported due to the fact that the size of the transformer is too large and the transportation width is out of limit, and the design and the manufacture of the transformer and a power station are more complicated.
Meanwhile, the three-phase autotransformer in the transformer product in the power equipment is regulated by three modes, namely independent high-voltage regulation, independent medium-voltage regulation and simultaneous high-voltage and medium-voltage regulation, the three modes are conventional voltage regulation modes, but the simple voltage regulation range is narrow, the adaptability to power grid fluctuation is poor, and the safety of the transformer and the power grid is reduced. Therefore, improvements are needed.
Disclosure of Invention
The invention provides an intelligent power distribution station system for an urban distribution network, aiming at solving the defects of the existing urban distribution network intelligent technology.
The above object of the present invention is achieved by the following technical means: according to the characteristics of an urban distribution network, the head end and the tail end of a first winding of each phase of the autotransformer are connected and then connected with the head end or the tail end of an on-load voltage regulating coil through a switch, and the tail end of the on-load voltage regulating coil is used as the negative pole of the phase; the head end of the loaded voltage regulating coil is used as the anode of the phase; the head end of the second winding is used as a sliding contact and is connected with the on-load voltage regulating coil; controlling each phase of sliding contact to reach the initial position of the on-load voltage regulating coil, and detecting whether the output voltages of the leading-out ends of the first winding and the second winding respectively reach the corresponding voltage set values; if not, checking a tap position selector of the switch until the output voltage reaches a voltage set value; if so, moving the sliding contact to the next step position; and traversing all the step positions of the on-load voltage regulating coil.
Further, after all the step positions, the no-load voltage regulating pointer is controlled to reach the initial position of the no-load voltage regulating coil, and whether the output voltage of the leading-out end of the third winding reaches a voltage set value is detected; if not, checking a tap position selector of the switch until the output voltage reaches a voltage set value; if the voltage reaches the preset value, the unloaded voltage regulating pointer is moved to the next step position; until all the step positions of the no-load voltage regulating coil are traversed.
Furthermore, the middle part of the first winding of each phase of the autotransformer is led out and serves as the leading-out end of the first winding of the phase.
Further, the head end of the second winding of each phase of the autotransformer is used as the leading-out end of the second winding of the phase.
Furthermore, the tail ends of the second windings of the three phases of the autotransformer are connected to serve as neutral points.
Furthermore, after the head end of the third winding of each phase of the autotransformer is connected with a reactor, the reactor is used as a third winding leading-out end of the phase.
Furthermore, the tail end of the third winding of each phase of the autotransformer is connected with a no-load voltage regulating coil, and the head end of the next phase is connected with a no-load voltage regulating pointer which is in contact with the no-load voltage regulating coil.
Compared with the prior art, the invention has the advantages that:
1. the invention reduces the width of the transformer because the three-phase air reactor is connected in series at the low-voltage side, thereby reducing the manufacturing cost of the transformer and the operation cost of a power grid, and reducing the occupied space for installing the transformer.
2. The invention effectively ensures the short-circuit resistance of the low-voltage winding because of the series connection of the reactors, thereby reducing the operation fault occurrence rate of the power grid.
3. The low-voltage winding (third winding) of the autotransformer is provided with the air reactor, and the purpose is to solve the problem of large impedance between high-low and medium-low windings, so that the main insulation distance of the transformer is reduced, the total width of the transformer is reduced, the outer limit of the transportation width of the transformer is not over standard, the volume of the transformer is reduced, and the cost of the transformer is further reduced.
4. The low-voltage winding of the autotransformer is very low in capacity, the impedance value between the high-low winding and the middle-low winding is small, and the short-circuit resistance is poor.
5. Because the low-voltage winding is connected with the air reactor in series, the main insulation distance of the transformer is reduced, thereby reducing the magnetic leakage of the transformer, preventing the local overheating of the transformer and ensuring the safe operation of the transformer.
6. The invention can automatically adjust the power flow of the power grid because the high voltage and the low voltage are both provided with voltage regulation, thereby effectively adjusting the power grid fluctuation and reducing the maintenance cost of the transformer and the power grid.
7. The voltage regulation method of the invention is high-voltage +/-16-grade on-load voltage regulation, low-voltage +/-2-grade no-load voltage regulation, and can realize multi-grade voltage regulation, namely the maximum voltage regulation range can reach +/-80 grades.
Drawings
FIG. 1 is a schematic diagram of a control circuit of the present invention.
Detailed Description
The present invention will be described in more detail with reference to examples.
As shown in fig. 1, the invention relates to an autotransformer of a distribution box type substation, according to the characteristics of an urban distribution network, the first winding head and tail ends of each phase of the autotransformer are connected and then connected with the head end or tail end of an on-load tap-changing coil through a switch, and the tail end of the on-load tap-changing coil is used as the negative pole of the phase; the head end of the loaded voltage regulating coil is used as the anode of the phase; the head end of the second winding is used as a sliding contact and is connected with the on-load voltage regulating coil; controlling each phase of sliding contact to reach the initial position of the on-load voltage regulating coil, and detecting whether the output voltages of the leading-out ends of the first winding and the second winding respectively reach the corresponding voltage set values; if not, checking a tap position selector of the switch until the output voltage reaches a voltage set value; if so, moving the sliding contact to the next step position; and traversing all the step positions of the on-load voltage regulating coil.
After all the step positions, the no-load voltage regulating pointer is controlled to reach the initial position of the no-load voltage regulating coil, and whether the output voltage of the leading-out end of the third winding reaches a voltage set value or not is detected; if not, checking a tap position selector of the switch until the output voltage reaches a voltage set value; if the voltage reaches the preset value, the unloaded voltage regulating pointer is moved to the next step position; until all the step positions of the no-load voltage regulating coil are traversed.
And the middle part of the first winding of each phase of the autotransformer is led out and is used as a first winding leading-out end of the phase.
And the head end of the second winding of each phase of the autotransformer is used as the leading-out end of the second winding of the phase.
Furthermore, the tail ends of the second windings of the three phases of the autotransformer are connected to serve as neutral points.
And the head end of the third winding of each phase of the autotransformer is connected with a reactor and then is used as a third winding leading-out end of the phase.
And the tail end of the third winding of each phase of the autotransformer is connected with a no-load voltage regulating coil, and the head end of the next phase is connected with a no-load voltage regulating pointer and is in contact with the no-load voltage regulating coil.
The autotransformer adopts a three-phase five-column type iron core structure and comprises a high-voltage coil, a medium-voltage coil, a high-voltage regulating coil, a low-voltage and low-voltage regulating coil YNa0d which are connected with the autotransformer in a connecting group. The coil arrangement mode is as follows: iron core-low voltage regulation-medium voltage coil-high voltage regulation coil. The transformer with the structure just can meet the impedance requirement. The high-voltage tail end is provided with on-load voltage regulation, the low-voltage tail end is provided with no-load voltage regulation, and the low-voltage head end is connected with a reactor in series.
The autotransformer is only provided with a series (high-voltage) coil, a load voltage regulation coil, a public (medium-voltage) coil, a low-voltage coil and a low-voltage no-load voltage regulation coil, and the tail end of the three-phase public (medium-voltage) coil is connected to a neutral point. The tail end of the high-voltage coil is provided with a load voltage regulating coil, the head end of the low-voltage coil is connected with a reactor in series, and the tail end of the low-voltage coil is provided with an unloaded voltage regulating coil.
The first winding head and the tail end of each phase of the autotransformer are connected and then connected with the head end or the tail end of the on-load voltage-regulating coil through a switch, and the tail end of the on-load voltage-regulating coil is used as the negative pole of the phase; the head end of the loaded voltage regulating coil is used as the anode of the phase; the head end of the second winding is used as a sliding contact to be connected with (in sliding contact with) the on-load voltage regulating coil, namely, the high-voltage regulating pointer can obtain different voltages along with the change of the position of the pointer, so that the voltage regulating function is realized.
The foregoing detailed description is given by way of example only, and is provided to better enable one skilled in the art to understand the patent, and is not intended to limit the scope of the patent; any equivalent alterations or modifications made according to the spirit of the disclosure of this patent are intended to be included in the scope of this patent.
Claims (7)
1. According to the characteristics of an urban distribution network, the head end and the tail end of a first winding of each phase of the autotransformer are connected and then connected with the head end or the tail end of an on-load voltage regulating coil through a switch, and the tail end of the on-load voltage regulating coil is used as the negative pole of the phase; the head end of the loaded voltage regulating coil is used as the anode of the phase; the head end of the second winding is used as a sliding contact and is connected with the on-load voltage regulating coil; controlling each phase of sliding contact to reach the initial position of the on-load voltage regulating coil, and detecting whether the output voltages of the leading-out ends of the first winding and the second winding respectively reach the corresponding voltage set values; if not, checking a tap position selector of the switch until the output voltage reaches a voltage set value; if so, moving the sliding contact to the next step position; and traversing all the step positions of the on-load voltage regulating coil.
2. The autotransformer of the distribution box substation of claim 1, wherein: after all the step positions, the no-load voltage regulating pointer is controlled to reach the initial position of the no-load voltage regulating coil, and whether the output voltage of the leading-out end of the third winding reaches a voltage set value or not is detected; if not, checking a tap position selector of the switch until the output voltage reaches a voltage set value; if the voltage reaches the preset value, the unloaded voltage regulating pointer is moved to the next step position; until all the step positions of the no-load voltage regulating coil are traversed.
3. The autotransformer of the distribution box substation of claim 2, wherein: and the middle part of the first winding of each phase of the autotransformer is led out and is used as a first winding leading-out end of the phase.
4. The autotransformer of the distribution box substation of claim 1, wherein: and the head end of the second winding of each phase of the autotransformer is used as the leading-out end of the second winding of the phase.
5. The autotransformer of the distribution box substation of claim 1, wherein: and the tail ends of the second windings of the three phases of the autotransformer are connected and then serve as neutral points.
6. The autotransformer of the distribution box substation of claim 1, wherein: and the head end of the third winding of each phase of the autotransformer is connected with a reactor and then is used as a third winding leading-out end of the phase.
7. The autotransformer of the distribution box substation of claim 1, wherein: and the tail end of the third winding of each phase of the autotransformer is connected with a no-load voltage regulating coil, and the head end of the next phase is connected with a no-load voltage regulating pointer and is in contact with the no-load voltage regulating coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811531211.2A CN111326326A (en) | 2018-12-14 | 2018-12-14 | Autotransformer of distribution box type transformer substation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811531211.2A CN111326326A (en) | 2018-12-14 | 2018-12-14 | Autotransformer of distribution box type transformer substation |
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| Publication Number | Publication Date |
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| CN111326326A true CN111326326A (en) | 2020-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811531211.2A Withdrawn CN111326326A (en) | 2018-12-14 | 2018-12-14 | Autotransformer of distribution box type transformer substation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112309697A (en) * | 2020-11-26 | 2021-02-02 | 郴州杉杉新材料有限公司 | Power supply transformer capable of dynamically adjusting capacitance compensation capacity |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106920656A (en) * | 2015-12-25 | 2017-07-04 | 特变电工沈阳变压器集团有限公司 | A kind of auto-transformer and its pressure regulation method with voltage regulation coil |
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2018
- 2018-12-14 CN CN201811531211.2A patent/CN111326326A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106920656A (en) * | 2015-12-25 | 2017-07-04 | 特变电工沈阳变压器集团有限公司 | A kind of auto-transformer and its pressure regulation method with voltage regulation coil |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112309697A (en) * | 2020-11-26 | 2021-02-02 | 郴州杉杉新材料有限公司 | Power supply transformer capable of dynamically adjusting capacitance compensation capacity |
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Application publication date: 20200623 |
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| WW01 | Invention patent application withdrawn after publication |