CN111540592A - 500kV single-phase on-load tap changing autotransformer with built-in compensation transformer - Google Patents
500kV single-phase on-load tap changing autotransformer with built-in compensation transformer Download PDFInfo
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- CN111540592A CN111540592A CN202010511824.0A CN202010511824A CN111540592A CN 111540592 A CN111540592 A CN 111540592A CN 202010511824 A CN202010511824 A CN 202010511824A CN 111540592 A CN111540592 A CN 111540592A
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- autotransformer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
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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
- H01F27/24—Magnetic cores
- H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
- H01F27/266—Fastening or mounting the core on casing or support
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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
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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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
- H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
Abstract
The invention relates to a 500kV single-phase on-load tap changing autotransformer with a built-in compensation transformer, belonging to the technical field of transformers. The technical scheme is as follows: the compensation transformer is arranged in a 500kV single-phase autotransformer oil tank, and neutral point side on-load voltage regulation is realized through an on-load switch; the single-phase autotransformer and the compensation transformer are placed in the same oil tank, and the compensation transformer is installed at the end part of the single-phase autotransformer iron core through a fixing device and is connected into a whole through a lead. The invention has the beneficial effects that: the voltage grade of the voltage regulating winding and the voltage grade of the on-load switch are low, the tapping lead structure is simple and compact, two transformers can be lifted and transported simultaneously, the cost is saved, and the electrical performance is improved.
Description
Technical Field
The invention relates to a 500kV single-phase on-load tap changing autotransformer with a built-in compensation transformer, belonging to the technical field of transformers.
Background
The 500kV single-phase autotransformer adopts neutral point side on-load power regulation, and can adopt an economical on-load tap-changer with low voltage insulation grade, a voltage regulating winding and a voltage regulating winding lead. However, as shown in fig. 1, which is a schematic diagram of a neutral point voltage regulating transformer, the magnetic flux of the transformer constantly changes during the voltage regulating process, and the voltage fluctuation of the third winding (low voltage winding) occurs, and the voltage drift inevitably has a requirement on the load, which causes great difficulty in connecting the third winding with the load (reactor, capacitor) that has a certain requirement on the voltage.
Disclosure of Invention
The invention aims to provide a 500kV single-phase on-load self-coupling voltage regulating transformer with a built-in compensation transformer, which solves the problem of voltage drift of a third winding, has low voltage level of a voltage regulating winding and an on-load switch of the transformer, simple structure of a tapping lead and compact structure, can realize the simultaneous hoisting and transportation of two transformers, saves the cost, improves the electrical performance and solves the technical problems in the prior art.
The technical scheme of the invention is as follows:
a500 kV single-phase on-load tap changer with a built-in compensation transformer is characterized in that the compensation transformer is built in a 500kV single-phase auto-transformer oil tank, and neutral point side on-load tap changing is realized through an on-load switch; the single-phase autotransformer and the compensation transformer are placed in the same oil tank, and the compensation transformer is installed at the end part of the single-phase autotransformer iron core through a fixing device and connected into a whole through a lead; the built-in compensation transformer is used for compensating low-voltage drift caused by magnetic flux change.
The single-phase autotransformer adopts a three-column iron core structure, a high-voltage winding, a medium-voltage winding, a voltage regulating winding and a low-voltage winding are all arranged on a main column of the three-column iron core, and the winding is arranged from outside to inside in sequence as follows: the voltage grade of each winding of the winding arrangement mode is gradually reduced, thereby being beneficial to insulation control and cost reduction.
The compensation transformer adopts a square iron core, and the low-voltage compensation winding and the low-voltage excitation winding are all arranged on one iron core column; the low-voltage excitation winding is connected with the voltage regulating winding of the single-phase autotransformer in parallel, and the low-voltage compensation winding is connected with the low-voltage winding of the single-phase autotransformer in series, so that the compensation effect on the low-voltage wire end of the single-phase autotransformer is realized.
The variation of the low-voltage compensation winding voltage is just opposite to that of the low-voltage winding (third winding) of the single-phase autotransformer. The technical scheme of the built-in compensator of the 500kV single-phase on-load tap changer not only solves the problem of voltage drift of the third winding, but also saves the cost, and particularly provides an effective solution for the development of an extra-high voltage high-capacity autotransformer.
The invention has the beneficial effects that: the voltage grade of the voltage regulating winding and the voltage grade of the on-load switch are low, the tapping lead structure is simple and compact, two transformers can be lifted and transported simultaneously, the cost is saved, and the electrical performance is improved.
Drawings
FIG. 1 is a schematic diagram of a prior art neutral point side on-load voltage regulation mode;
FIG. 2 is a schematic diagram of the connection of a compensation transformer of the present invention to a single phase autotransformer;
FIG. 3 is a schematic diagram of the transformer wiring of the present invention;
FIG. 4 is a top plan view of the body arrangement of the present invention;
FIG. 5 is a schematic front view of the body arrangement of the present invention;
FIG. 6 is a K-K view of the present invention, i.e., a schematic view of the load switch position;
FIG. 7 is a schematic view of the bushing arrangement of the present invention;
in the figure: the high-voltage winding SV, the medium-voltage winding CV, the voltage regulating winding TV, the low-voltage winding LV, the low-voltage excitation winding LE and the low-voltage compensation winding LT.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings.
A500 kV single-phase on-load tap changer with a built-in compensation transformer is characterized in that the compensation transformer is built in a 500kV single-phase auto-transformer oil tank, and neutral point side on-load tap changing is realized through an on-load switch; the single-phase autotransformer and the compensation transformer are placed in the same oil tank, and the compensation transformer is installed at the end part of the single-phase autotransformer iron core through a fixing device and connected into a whole through a lead; the built-in compensation transformer is used for compensating low-voltage drift caused by magnetic flux change.
The single-phase autotransformer adopts a three-column iron core structure, a high-voltage winding, a medium-voltage winding, a voltage regulating winding and a low-voltage winding are all arranged on a main column of the three-column iron core, and the winding is arranged from outside to inside in sequence as follows: the voltage grade of each winding of the winding arrangement mode is gradually reduced, thereby being beneficial to insulation control and cost reduction.
The compensation transformer adopts a square iron core, and the low-voltage compensation winding and the low-voltage excitation winding are all arranged on one iron core column; the low-voltage excitation winding is connected with the voltage regulating winding of the single-phase autotransformer in parallel, and the low-voltage compensation winding is connected with the low-voltage winding of the single-phase autotransformer in series, so that the compensation effect on the low-voltage wire end of the single-phase autotransformer is realized.
The low-side voltage can be kept constant by using a compensation transformer, the connection of which is shown in fig. 2, the voltage of the low-voltage compensation winding varies exactly opposite to the variation of the low-voltage winding (third winding) of the single-phase autotransformer. The technical scheme of the built-in compensator of the 500kV single-phase on-load tap changer not only solves the problem of voltage drift of the third winding, but also saves the cost, and particularly provides an effective solution for the development of an extra-high voltage high-capacity autotransformer.
The transformer principle is shown in fig. 3. The body (including iron core) of the compensation transformer is installed on the upper and lower clamps of the iron core of the single-phase autotransformer through a fixing device, and the two transformer bodies are insulated from each other through an insulating material, as shown in fig. 4 and 5. The on-load switch is fixed at the side column position of the single-phase autotransformer, so that the space is saved and the wiring is convenient, as shown in figures 4 and 6. After the transformer is assembled, the transformer is hoisted into the oil tank together, and the outer sleeve is installed, as shown in fig. 7.
Claims (4)
1. The utility model provides a single-phase on-load tap changing transformer of 500kV of built-in compensating transformer which characterized in that: the compensation transformer is arranged in a 500kV single-phase autotransformer oil tank, and neutral point side on-load voltage regulation is realized through an on-load switch; the single-phase autotransformer and the compensation transformer are placed in the same oil tank, and the compensation transformer is installed at the end part of the single-phase autotransformer iron core through a fixing device and connected into a whole through a lead; the built-in compensation transformer is used for compensating low-voltage drift caused by magnetic flux change.
2. The 500kV single-phase on-load tap changing autotransformer with built-in compensation transformer as claimed in claim 1, wherein: the single-phase autotransformer adopts a three-column iron core structure, a high-voltage winding, a medium-voltage winding, a voltage regulating winding and a low-voltage winding are all arranged on a main column of the three-column iron core, and the winding is arranged from outside to inside in sequence as follows: the voltage level of each winding of the winding arrangement mode is gradually reduced.
3. The 500kV single-phase on-load tap changer with the built-in compensation transformer as claimed in claim 1 or 2, wherein: the compensation transformer adopts a square iron core, and the low-voltage compensation winding and the low-voltage excitation winding are all arranged on one iron core column; the low-voltage excitation winding is connected with the voltage regulating winding of the single-phase autotransformer in parallel, and the low-voltage compensation winding is connected with the low-voltage winding of the single-phase autotransformer in series.
4. The 500kV single-phase on-load tap changing autotransformer with built-in compensation transformer as claimed in claim 3, wherein: the voltage change of the low-voltage compensation winding is just opposite to the low-voltage winding change of the single-phase autotransformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010511824.0A CN111540592A (en) | 2020-06-08 | 2020-06-08 | 500kV single-phase on-load tap changing autotransformer with built-in compensation transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010511824.0A CN111540592A (en) | 2020-06-08 | 2020-06-08 | 500kV single-phase on-load tap changing autotransformer with built-in compensation transformer |
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| Publication Number | Publication Date |
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| CN111540592A true CN111540592A (en) | 2020-08-14 |
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| CN202010511824.0A Pending CN111540592A (en) | 2020-06-08 | 2020-06-08 | 500kV single-phase on-load tap changing autotransformer with built-in compensation transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113325209A (en) * | 2020-12-02 | 2021-08-31 | 吴江变压器有限公司 | Design method of temporary sleeve outgoing line for transformer test |
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2020
- 2020-06-08 CN CN202010511824.0A patent/CN111540592A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113325209A (en) * | 2020-12-02 | 2021-08-31 | 吴江变压器有限公司 | Design method of temporary sleeve outgoing line for transformer test |
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