CN212032863U - 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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- CN212032863U CN212032863U CN202021031474.XU CN202021031474U CN212032863U CN 212032863 U CN212032863 U CN 212032863U CN 202021031474 U CN202021031474 U CN 202021031474U CN 212032863 U CN212032863 U CN 212032863U
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Abstract
The utility model relates to a single-phase self on-load tap changing transformer of 500kV of built-in compensating transformer belongs to transformer technical field. 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 utility model has the advantages 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 utility model relates to a single-phase self on-load tap changing transformer of 500kV of built-in compensating transformer belongs to transformer technical field.
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.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a single-phase self on-load tap changing transformer of 500kV of built-in compensating transformer has solved the third winding voltage drift problem, and transformer tap winding is low with on-load switch voltage level, and tapping lead simple structure, compact structure can realize that two transformers lift by crane simultaneously and transport, has both practiced thrift the cost and has improved electrical property, solves the above-mentioned technical problem that prior art exists.
The technical scheme of the utility model is that:
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 utility model discloses the technical scheme of the single-phase on-load tap changer built-in compensator of 500kV had both solved the third winding voltage drift problem, had saved the cost again, especially provided an effectual solution way to the development of special high voltage large capacity autotransformer.
The utility model has the advantages 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 between the compensation transformer and the single-phase autotransformer of the present invention;
FIG. 3 is a schematic diagram of the transformer wiring of the present invention;
fig. 4 is a plan view of the device body arrangement of the present invention;
fig. 5 is a schematic front view of the arrangement of the body of the present invention;
fig. 6 is a view of the utility model K-K, i.e. with load switch position diagram view;
fig. 7 is a schematic view of the arrangement of the casing of the present invention;
in the figure: the high-voltage transformer comprises a high-voltage winding SV, a medium-voltage winding CV, a voltage regulating winding TV, a low-voltage winding LV, a low-voltage exciting winding LE, a low-voltage compensating winding LT, a single-phase autotransformer 1, a compensating transformer 2 and an on-load switch 3.
Detailed Description
The present invention will be further explained by way of examples with reference to the accompanying drawings.
A500 kV single-phase on-load tap changer with a built-in compensation transformer is characterized in that a compensation transformer 2 is built in a 500kV single-phase auto-change transformer oil tank, and neutral point side on-load tap changing is achieved through an on-load switch 3; the single-phase autotransformer 1 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 utility model discloses the technical scheme of the single-phase on-load tap changer built-in compensator of 500kV had both solved the third winding voltage drift problem, had saved the cost again, especially provided an effectual solution way to the development of special high voltage large 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 |
|---|---|---|---|
| CN202021031474.XU CN212032863U (en) | 2020-06-08 | 2020-06-08 | 500kV single-phase on-load tap changing autotransformer with built-in compensation transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021031474.XU CN212032863U (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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| CN212032863U true CN212032863U (en) | 2020-11-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021031474.XU Active CN212032863U (en) | 2020-06-08 | 2020-06-08 | 500kV single-phase on-load tap changing autotransformer with built-in compensation transformer |
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| Country | Link |
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| CN (1) | CN212032863U (en) |
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2020
- 2020-06-08 CN CN202021031474.XU patent/CN212032863U/en active Active
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