CN102360873B - Two-core column voltage transformer - Google Patents
Two-core column voltage transformer Download PDFInfo
- Publication number
- CN102360873B CN102360873B CN 201110158924 CN201110158924A CN102360873B CN 102360873 B CN102360873 B CN 102360873B CN 201110158924 CN201110158924 CN 201110158924 CN 201110158924 A CN201110158924 A CN 201110158924A CN 102360873 B CN102360873 B CN 102360873B
- Authority
- CN
- China
- Prior art keywords
- stem
- winding
- transformer
- isolating transformer
- iron core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Transformers For Measuring Instruments (AREA)
Abstract
The invention relates to a two-core column transformer which comprises a metal box body with an inner cavity, a square-shaped two-core column iron core of the voltage transformer, and a square-shaped single-core column iron core of an isolation transformer, wherein a high-voltage sleeve and a grounding sleeve are respectively arranged at the top and the bottom of the metal box body, and the metal box body is filled with inert gas; the square-shaped two-core column iron core of the voltage transformer is arranged at the upper part of the inner cavity of the metal box body and electrically connected with the metal box body, and comprises an upper core column and a lower core column, an upper balancing winding and a first-section primary winding are wound on the upper core column, and a second-section primary winding and a secondary winding of the voltage transformer are wound on the lower core column; the square-shaped single-core column iron core of the isolation transformer is arranged at the lower part of the inner cavity of the metal box body and electrically connected with the metal box body, a primary winding of the isolation transformer is wound on the single-core column iron core, an annular shielding cover is arranged around the single-core column iron core, and the secondary winding of the isolation transformer is wound in the annular shielding cover; the upper balancing winding is further used for supplying power to the primary winding of the isolation transformer; and the secondary winding of the isolation transformer and the secondary winding of the voltage transformer are connected in series for being used as the secondary output side.
Description
Technical field
The present invention relates to a kind of voltage transformer, especially a kind of gas isolated two core column structure voltage transformers.
Background technology
The voltage transformer of two stem stems is mainly used in the 110kV electric power system.
The structure of this voltage transformer, it mainly is the iron core that a hollow is installed in a porcelain case that is filled with insulating oil, on iron core has, lower two stem stems, be arranged with balance winding and winding of first paragraph at upper stem stem, be arranged with lower balance winding and winding of second segment at lower stem stem, winding outside of this external second segment is arranged with secondary winding, the characteristics of this structure are that winding of winding of first paragraph and second segment has the identical number of turn, upper balance winding also has the identical number of turn with lower balance winding, after being connected, the inboard outlet of a winding of the inboard outlet of a winding of first paragraph and second segment carries out some electrical connection with iron core again, and, upper balance winding connects with lower balance winding parallel, primary voltage is introduced from the primary connection terminal that is installed in the porcelain upper box part, be connected with a winding outside outlet of first paragraph, second segment outside outlet then is cold end, and it is drawn from the mounting seat of porcelain case with the secondary winding outlet.
Upper and lower balance winding plays a part balanced upper and lower two stem stem magnetic fluxs, can effectively reduce the voltage ratio error of voltage transformer.This instrument transformer is in operation, and the iron core voltage to earth is near 1/2nd of the primary side voltage to earth, and iron core need to be fixed on the insulation column.
The voltage transformer of this two core column structure, using the advantage of porcelain case is to consider that iron core is to the insulation of casing, but the mechanical strength of porcelain case is low, innage is large, have potential safety hazard, if primary side voltage increases, then not only needing has larger sized porcelain case, and in order to satisfy the requirement of iron core insulation against ground, also to increase the height of porcelain case; And larger problem is that the iron core capacitive earth current can increase and strengthen along with primary voltage, makes the error of voltage transformer unstable, and this has just limited the use of two core column structure voltage transformers under high voltage more.
Summary of the invention
For the voltage transformer that overcomes present two core column structures because porcelain punch-out equipment tool intensity is low, the large potential safety hazard of bringing of innage, and larger sized porcelain case need to be arranged when increasing for primary voltage, fail safe is lower, the iron core capacitive earth current adds the shortcomings such as the error of ambassador's voltage transformer is unstable, the invention provides a kind of two core column voltage transformers that improve structure, to satisfy the requirement of under superhigh pressure and ultra high voltage, using.
The present invention is that the technical scheme that its technical problem of solution adopts is:
A kind of two stem stem instrument transformers comprise:
One possesses the metal cabinet of inner chamber, is respectively equipped with bushing and grounding sleeve in Qi Ding, bottom, is filled with inert gas in bushing, grounding sleeve and the inner chamber;
One is arranged at the inner chamber top of described metal cabinet, and with the voltage transformer hollow two stem stem iron cores of metal cabinet electrical connection, has upper and lower stem stem, be arranged with winding of balance winding and first paragraph on it on the stem stem, its lower stem stem is arranged with winding of second segment and secondary windings of PT;
One is arranged at the inner chamber bottom of described metal cabinet, and with the isolating transformer hollow list stem stem iron core of metal cabinet electrical connection, be arranged with winding of isolating transformer on its single stem stem iron core, be provided with the ring shielding cover around described single stem stem iron core, be arranged with the isolating transformer secondary winding in this ring shielding cover; Powered to winding of isolating transformer by upper balance winding by this; Wherein
Described isolating transformer secondary winding is connected with secondary windings of PT, with as the secondary outlet side.
As the further improvement of such scheme, winding of described first paragraph multiply by winding of isolating transformer to the rated voltage ratio of upper balance winding the rated voltage ratio of isolating transformer secondary winding is equaled winding of second segment to the rated voltage ratio of secondary windings of PT.
Operation principle of the present invention is, primary voltage near five equilibrium be applied on winding of first paragraph and winding of second segment, upper balance winding and winding coupled of first paragraph around upper stem stem, the Voltage-output of upper balance winding is as the once input of isolating transformer, around secondary windings of PT and winding coupled of second segment of lower stem stem, the Voltage-output of secondary windings of PT is connected addition as the output of the secondary of gas-insulated modified model two core column voltage transformers with the Voltage-output of isolating transformer secondary winding.
If be applied to the primary voltage of two core column voltage transformers be
, wherein winding of first paragraph is got voltage and is
, winding of second segment is got voltage and is
, be M around winding of first paragraph of upper stem stem and the rated voltage ratio of upper balance winding, be K around winding of second segment and the secondary windings of PT rated voltage ratio of lower stem stem, the rated voltage ratio of isolating transformer is N, then has:
=
In the formula:
Regulation K=MN during design then has:
The error that can obtain gas-insulated modified model two core column voltage transformers according to the definition of voltage transformer error is:
Because two windings on each stem stem can be realized closely magnetic coupling, the error component of following formula
,
,
Can both accomplish enough little, thereby make the error of two core column voltage transformers of the present invention can be enough little.
Therefore the present invention can use larger sized iron core and winding, to improve the electric pressure of voltage transformer, therefore can produce the voltage transformer that is applied to superhigh pressure and ultra high voltage; And because the present invention has reduced by 1/2nd to the insulation level of the bushing of voltage transformer use, therefore can save cost; As seen, the present invention can overcome the potential safety hazard of existing two core column voltage transformers, and can the broaden application scope, has realized simultaneously saving material and cost.
Description of drawings
Further specify below in conjunction with the drawings and specific embodiments:
Fig. 1 is structure principle chart of the present invention;
Fig. 2 is the structural representation of an embodiment of the present invention.
Each parts label among the figure:
1. winding of first paragraph; 2. go up the balance winding; 3. voltage transformer square shape two stem stem iron cores; 4. winding of second segment; 5. secondary windings of PT; 6. isolating transformer square shape list stem stem iron core; 7. winding of isolating transformer; 8. isolating transformer secondary winding; 9. grading ring; 10. bushing; 11. conduit; 12. grounding sleeve; 13. ground connection base; 14. terminal board; 15. secondary wiring pipe; 16. grounding sleeve capacitance plate; 17. ring shielding cover; 18. metal cabinet; 19. bushing capacitance plate.
Embodiment
With reference to Fig. 1 and Fig. 2, modified model gas-insulating type two core column voltage transformers provided by the present invention, metal cabinet 18 wherein has an inner chamber, top in this inner chamber is provided with voltage transformer hollow two stem stem iron cores 3, the bottom of this inner chamber is provided with isolating transformer square shape list stem stem iron core 6, winding 1 of upper balance winding 2 and first paragraph is above the upper stem stem of voltage transformer square shape two stem stem iron cores 3, winding 4 of second segment and secondary winding 5 are above the lower stem stem of two stem stem iron cores 3, and winding 7 of isolating transformer and secondary winding 8 are above the stem stem of isolating transformer square shape list stem stem iron core 6.
The outside outlet of a winding 1 of first paragraph is passed from bushing 10 by a conduit 11, join with a grading ring 9, the inboard outlet of the 1 inboard outlet of winding of first paragraph and a winding 4 of second segment is joined, and is electrically connected with voltage transformer square shape two stem stem iron cores 3.
Two outlets of upper balance winding 2 are connected with two outlets of the winding 7 of isolating transformer on isolating transformer square shape list stem stem iron core 6, and with voltage transformer square shape two stem stem iron cores 3 and 6 electrical connections of isolating transformer square shape list stem stem iron core.
Isolating transformer secondary winding 8 is installed in the ring shielding cover 17 of ground connection, its outlet with in ring shielding cover 17, finish Voltage Series around two outlets of 3 times secondary windings of PTs 5 above the stem stem of voltage transformer square shape two stem stem iron cores and be connected, remaining two outlets of head and tail are passed 12 along secondary wiring pipe 15 from grounding sleeve, are connected with the n terminal with a of terminal board 14 after arriving ground connection base 13.
In metal cabinet 18 and bushing 10 junctions bushing capacitance plate 19 is installed, in metal cabinet 18 and grounding sleeve 10 junctions grounding sleeve capacitance plate 16 is installed, metal cabinet 18 pressing force Vessel Designs, inside are filled with at least SF6 gas of 0.4MPa pressure; Sensor square shape two stem stem iron cores 3, and isolating transformer square shape list stem stem iron core 6 is electrically connected with metal cabinet 18.
As shown in Figure 2, the two core column voltage transformer embodiment of a kind of 1000kV that invention provides, wherein the rated voltage ratio of 4 pairs of upper balance windings 2 of winding of first paragraph is 500kV/ √ 3/100V, the rated voltage ratio of 4 pairs of secondary windings of PTs 5 of a winding of second segment is 500kV/ √ 3/50V √ 3, the rated voltage ratio of 7 pairs of isolating transformer secondary winding 8 of a winding of isolating transformer is 100V/ 50V/ √ 3, and the rated voltage ratio of two core column voltage transformers is 1000kV/ √ 3/100V/ √ 3, for the voltage of winding of balanced first paragraph 4 with a winding 4 of second segment, bushing capacitance plate 19 has different size with grounding sleeve capacitance plate 16, the capacitance plate 19 of bushing is larger, and its capacitance current approaches the capacitance current that equals iron core and 18 pairs of isolating transformer ring shieldings of metal cabinet cover 17 and ground.
Certainly, the invention is not limited to above-mentioned execution mode, those of ordinary skill in the art also can make equivalent variations or replacement under the prerequisite of spirit of the present invention, the modification that these are equal to or replacement all are included in the application's claim limited range.
Claims (8)
1. stem stem instrument transformer is characterized in that comprising:
One possesses the metal cabinet of inner chamber, is respectively equipped with bushing and grounding sleeve in Qi Ding, bottom, is filled with inert gas in bushing, grounding sleeve and the inner chamber;
One is arranged at the inner chamber top of described metal cabinet, and with the voltage transformer hollow two stem stem iron cores of metal cabinet electrical connection, it has upper and lower stem stem, wherein go up and be arranged with balance winding and winding of first paragraph on the stem stem, lower stem stem is arranged with winding of second segment and secondary windings of PT;
One is arranged at the inner chamber bottom of described metal cabinet, and with the isolating transformer hollow list stem stem iron core of metal cabinet electrical connection, be arranged with winding of isolating transformer on its single stem stem iron core, be provided with the ring shielding cover around described single stem stem iron core, be arranged with the isolating transformer secondary winding in this ring shielding cover; Powered to winding of isolating transformer by upper balance winding by this; Wherein
Described isolating transformer secondary winding is connected with secondary windings of PT, with as the secondary outlet side.
2. a kind of two stem stem instrument transformers according to claim 1 is characterized in that: winding of described first paragraph multiply by winding of isolating transformer to the rated voltage ratio of upper balance winding the rated voltage ratio of isolating transformer secondary winding is equaled winding of second segment to the rated voltage ratio of secondary windings of PT.
3. a kind of two stem stem instrument transformers according to claim 1, it is characterized in that: described inert gas is SF
6
4. a kind of two stem stem instrument transformers according to claim 1, it is characterized in that: described bushing end is provided with grading ring, the outside outlet of a winding of described first paragraph is passed from bushing by a conduit, be connected with a grading ring, the inboard outlet of the inboard outlet of winding of described first paragraph and a winding of second segment is joined, and is electrically connected with voltage transformer square shape two stem stem iron cores.
5. a kind of two stem stem instrument transformers according to claim 1, it is characterized in that: described ground sleeve pipe end is provided with the ground connection base, be provided with terminal board on this ground connection base, described ring shielding cover is passed in the outside outlet of a winding of described second segment, and pass from grounding sleeve along the secondary wiring pipe, connect the N terminal of the terminal board of ground connection base.
6. a kind of two stem stem instrument transformers according to claim 1, it is characterized in that: two outlets of a winding of two outlets and isolating transformers of described upper balance winding are connected, and are electrically connected with described voltage transformer square shape two stem stem iron cores and described isolating transformer square shape list stem stem iron core.
7. a kind of two stem stem instrument transformers according to claim 5, it is characterized in that: two outlets of the outlet of described isolating transformer secondary winding and secondary windings of PT are connected in series in the ring shielding cover, two outlets of the head and tail of described isolating transformer secondary winding are passed from grounding sleeve along the secondary wiring pipe, connect a terminal and the N terminal of the terminal board of described ground connection base.
8. a kind of two stem stem instrument transformers according to claim 1, it is characterized in that: described metal cabinet and bushing junction are equipped with the bushing capacitance plate, and described metal cabinet and grounding sleeve junction are equipped with the grounding sleeve capacitance plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110158924 CN102360873B (en) | 2011-06-14 | 2011-06-14 | Two-core column voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110158924 CN102360873B (en) | 2011-06-14 | 2011-06-14 | Two-core column voltage transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102360873A CN102360873A (en) | 2012-02-22 |
| CN102360873B true CN102360873B (en) | 2013-01-16 |
Family
ID=45586161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110158924 Expired - Fee Related CN102360873B (en) | 2011-06-14 | 2011-06-14 | Two-core column voltage transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102360873B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022209761A1 (en) | 2022-09-16 | 2024-03-21 | Siemens Energy Global GmbH & Co. KG | Coil arrangement for a power-voltage converter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0755061B1 (en) * | 1995-07-15 | 1998-12-16 | Kommanditgesellschaft Ritz Messwandler GmbH & Co. | Single-pole voltage transformer |
| CN201698885U (en) * | 2010-06-23 | 2011-01-05 | 大连金业电力设备有限公司 | 66kV outdoor ring seal composite electromagnetic type capacitance voltage transformer |
| CN202093966U (en) * | 2011-06-14 | 2011-12-28 | 中山市泰峰电气有限公司 | Voltage transformer with two stems |
-
2011
- 2011-06-14 CN CN 201110158924 patent/CN102360873B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0755061B1 (en) * | 1995-07-15 | 1998-12-16 | Kommanditgesellschaft Ritz Messwandler GmbH & Co. | Single-pole voltage transformer |
| CN201698885U (en) * | 2010-06-23 | 2011-01-05 | 大连金业电力设备有限公司 | 66kV outdoor ring seal composite electromagnetic type capacitance voltage transformer |
| CN202093966U (en) * | 2011-06-14 | 2011-12-28 | 中山市泰峰电气有限公司 | Voltage transformer with two stems |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102360873A (en) | 2012-02-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102360873B (en) | Two-core column voltage transformer | |
| CN202796409U (en) | Dry type voltage transformer for switchgears | |
| CN203552920U (en) | Voltage transformer with compact structure | |
| CN202093966U (en) | Voltage transformer with two stems | |
| CN102779680A (en) | Solid-sealed polar pole with internally casting current transformer | |
| CN208093344U (en) | A kind of dc circuit breaker energy supply transformer | |
| CN203013493U (en) | Electronic voltage transformer for high-voltage cubicle type gas insulated switchgear | |
| CN1933060B (en) | Electromagnetic voltage mutual inductor used for super high voltage and extra-high voltage | |
| CN205789480U (en) | A kind of Novel composite mutual inductor | |
| CN205264483U (en) | External current transformer | |
| CN202816628U (en) | High-frequency insulation power transformer | |
| CN203871171U (en) | Combined type mutual inductor | |
| CN205230796U (en) | Voltage transformer | |
| CN203746639U (en) | Line-terminal on-load voltage regulating single-phase 220kV high-impedance transformer | |
| CN103474221B (en) | A kind of novel voltage transformer | |
| CN200950390Y (en) | Electromagnetic voltage potential transformer for superhigh voltage and extra-high voltage | |
| CN107545998B (en) | Isolation transformer | |
| CN207068639U (en) | Outdoor pole top switch three-phase current combination transformer | |
| CN201674149U (en) | Inflatable ring network switch cabinet | |
| CN204088019U (en) | Solid insulation switch cabinet current mutual inductor special | |
| CN205670500U (en) | Outdoor three-phase 4PT voltage transformer | |
| CN201266540Y (en) | Epoxy insulation sheath voltage mutual inductor | |
| CN204857427U (en) | 220kV miniaturization electromagnetic type voltage transformer for GIS | |
| CN202758729U (en) | Single-phase voltage transformer for intelligent user switch for dividing | |
| CN202495328U (en) | Low-voltage adjustable compensating inductor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130116 |