CN114141511A - Gas-insulated three-phase 4PT combined voltage transformer - Google Patents
Gas-insulated three-phase 4PT combined voltage transformer Download PDFInfo
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- CN114141511A CN114141511A CN202111448066.3A CN202111448066A CN114141511A CN 114141511 A CN114141511 A CN 114141511A CN 202111448066 A CN202111448066 A CN 202111448066A CN 114141511 A CN114141511 A CN 114141511A
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- voltage
- transformer
- voltage transformer
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- 238000009413 insulation Methods 0.000 claims abstract description 15
- 238000004804 winding Methods 0.000 claims description 33
- 238000005242 forging Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 abstract description 2
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/24—Voltage transformers
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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
- H01F27/02—Casings
- H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
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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
- H01F27/29—Terminals; Tapping arrangements for signal inductances
-
- 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
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/321—Insulating of coils, windings, or parts thereof using a fluid for insulating purposes only
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/24—Voltage transformers
- H01F38/26—Constructions
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The invention relates to the technical field of high-voltage electricity, and provides a gas-insulated three-phase 4PT combined voltage transformer. Three one-way voltage transformers and a zero sequence voltage transformer are installed in the shell, three primary high-voltage ends which are correspondingly connected with the one-way voltage transformers and two grounding primary high-voltage ends which are connected with the zero sequence voltage transformer are installed on the outer side of the shell, and a traditional pouring insulation transformer is replaced by a gas insulation mode, so that the problem that stress concentration is easy to occur after the large-volume pouring transformer is solidified is solved, and various potential safety hazards caused by stress concentration are eliminated. The primary high-voltage end of the gas-insulated three-phase 4PT combined voltage transformer can be replaced by different structures such as an insulating sleeve, an inner cone plug-in type insulating socket and an outer cone plug-in type insulating socket according to actual requirements, the whole transformer does not need to be scrapped when the primary high-voltage end is damaged, and only the primary high-voltage end needs to be replaced.
Description
Technical Field
The invention relates to the technical field of high-voltage electricity, in particular to a gas-insulated three-phase 4PT combined voltage transformer.
Background
The 4PT voltage transformer is used for bearing the zero sequence voltage when a power system fails by adopting the design of adding the zero sequence PT under the complex electrical condition of the power system, and protects the non-failure phase PT voltage from being damaged due to the overlarge rise multiple, so that the whole circuit can stably run. At present, a 4PT voltage transformer below 20kV is manufactured by adopting an integrated resin pouring process, the product is large in size and heavy, the problem of stress concentration after resin curing is easy to occur, local discharge is large during use, cracking is easy to occur, and potential safety hazards exist; the 4PT voltage transformers with the voltage of more than 20kV are limited by the fact that the manufacturing process can only adopt a split type resin pouring process, 4 independent voltage transformers are combined according to the 4PT wiring mode, installation is inconvenient, and faults are caused due to the fact that wiring errors can occur. In addition, the one-time high-voltage end of the transformer poured by resin can not be replaced, and various models are needed to deal with different application scenes, so that the manufacture and installation of products are inconvenient.
Disclosure of Invention
In order to overcome the defects caused by the fact that a combined voltage transformer adopts a resin pouring process in the prior art, the invention provides a three-phase 4PT combined voltage transformer adopting gas insulation.
The technical scheme adopted by the invention is as follows:
a gas-insulated three-phase 4PT combined voltage transformer comprises a shell, wherein a secondary junction box is arranged on the outer side of the shell, three unidirectional voltage transformers and a zero-sequence voltage transformer are arranged in the shell, three primary high-voltage ends correspondingly connected with the unidirectional voltage transformers and two grounding primary high-voltage ends connected with the zero-sequence voltage transformers are arranged on the outer side of the shell, one primary terminal of each unidirectional voltage transformer is connected with the corresponding primary high-voltage end, the other primary terminal of each unidirectional voltage transformer is connected in parallel and is connected with one primary terminal of the zero-sequence voltage transformer, and the other primary terminal of the zero-sequence voltage transformer is connected with the grounding high-voltage primary end; each one-way voltage transformer is provided with three groups of secondary windings, the zero sequence voltage transformer is provided with three groups of secondary windings, and one wiring terminal of the first group of secondary windings of the three one-way voltage transformers is connected with a wire in parallel and is connected with one wiring terminal of the first group of secondary windings of the zero sequence voltage transformer; one terminal of a second group of secondary windings of the three unidirectional voltage transformers is connected with a wire in parallel and is connected with one terminal of a second group of secondary windings of the zero sequence voltage transformer, and a third group of secondary windings of the three unidirectional voltage transformers are connected in series to form an open triangle; the other terminals of the first and second groups of secondary windings of the three unidirectional voltage transformers are connected with the secondary junction box; the wiring terminals of the first and second groups of secondary windings of the zero sequence forging transformer, which are connected with the unidirectional voltage transformer, are connected with a secondary wiring box, and the other wiring terminal of the first and second groups of secondary windings of the zero sequence forging transformer is grounded; and a third group of secondary windings of the zero sequence voltage transformer is connected with the grounding monitoring relay.
Furthermore, the shell is internally provided with a closed space, the shell is filled with insulating gas, and the outer side of the shell is provided with a density relay.
Further, the density relay is provided with a signal interface.
Further, the insulating gas is SF6 or a mixed gas of SF6 and N2, and the pressure of the insulating gas is 0.2MPa-0.35 MPa.
Further, the top of the shell is provided with a mounting flange, and the primary high-voltage end and the grounded primary high-voltage end are connected with the flange.
Still further, the connection mode of the primary high-voltage end and the shell is one of an insulating sleeve, an inner cone plug-in type insulating socket and an outer cone plug-in type insulating socket.
After the technical scheme is adopted, the invention has the beneficial effects that: the traditional pouring insulation mutual inductor is replaced by a gas insulation mode, the problem that stress concentration is easy to occur after the large-volume pouring mutual inductor is solidified is solved, and various potential safety hazards caused by stress concentration are eliminated. The primary high-voltage end of the gas-insulated three-phase 4PT combined voltage transformer can be replaced by different structures such as an insulating sleeve, an inner cone plug-in type insulating socket and an outer cone plug-in type insulating socket according to actual requirements, the whole transformer does not need to be scrapped when the primary high-voltage end is damaged, and only the primary high-voltage end needs to be replaced. The gas-insulated three-phase 4PT combined voltage transformer is lighter and more convenient to install, has low requirement on the strength of a mounting point (a matched product), and saves the cost.
Drawings
FIG. 1 is an internal structural view of the present invention;
FIG. 2 is an external structural view of the present invention;
fig. 3 is a schematic circuit diagram of the present invention.
Detailed Description
The following detailed description of the embodiments of the invention is provided in conjunction with the accompanying drawings:
as shown in fig. 1, the gas-insulated three-phase 4PT combined voltage transformer is characterized by comprising a shell 1, five primary high-voltage terminals 2 are connected to the upper part of the shell 1, and two primary high-voltage terminals 2 are grounded. The housing 1 is connected to a primary high pressure end 2 via a flange 3. Three single-phase voltage transformers 4 and a zero sequence voltage transformer 5 are installed in the shell 1, and the shell 1 is connected with the voltage transformers 4 and the zero sequence voltage transformer 5 through a support 6. A density relay 7 and a secondary terminal box 8 are connected to the outside of the case 1, and a secondary terminal board 9 is mounted in the secondary terminal box 8, as shown in fig. 2. The secondary junction box 8 adopts a dustproof and waterproof design, and the dustproof and waterproof grade is IP 67. The shell 1 is filled with insulating gas, the insulating gas is mixed gas of SF6 or SF6 and N2, the air pressure of the insulating gas is 0.2-0.35 MPa, the density relay 7 is used for monitoring pressure signals of the gas in the shell, and the density relay 7 is provided with a signal interface to facilitate transmission of monitoring signals.
As shown in fig. 3, the connection modes of three single-phase voltage transformers 4 and one zero-sequence voltage transformer 5 are as follows: one primary terminal of each one-way voltage transformer 4 is connected with the corresponding primary high-voltage end 2, the other primary terminal of each one-way voltage transformer 4 is connected in parallel and connected with one primary terminal of the zero-sequence voltage transformer 5, and the two primary terminals of the zero-sequence voltage transformer 5 are connected with the two grounded high-voltage primary ends 2;
each unidirectional voltage transformer 4 is respectively provided with three groups of secondary windings, the zero sequence voltage transformer 5 is also provided with three groups of secondary windings, and one terminal of the first group of secondary windings of the three unidirectional voltage transformers 4 is connected with a wire in parallel and is connected with one terminal of the first group of secondary windings of the zero sequence voltage transformer 5; one terminal of a second group of secondary windings of the three unidirectional voltage transformers 4 is connected with a wire in parallel and is connected with one terminal of a second group of secondary windings of the zero sequence voltage transformer 5, and a third group of secondary windings of the three unidirectional voltage transformers 4 are connected in series to form an open triangle; the other terminals of the first and second groups of secondary windings of the three unidirectional voltage transformers 4 are connected with a secondary junction box 8; the wiring ends of the first and second groups of secondary windings of the zero sequence forging transformer 5, which are connected with the unidirectional voltage transformer 4, are connected with a secondary wiring box 8, and the other wiring ends of the first and second groups of secondary windings of the zero sequence forging transformer 5 are grounded; and a third group of secondary windings of the zero sequence voltage transformer 5 is connected with a grounding monitoring relay.
The single-phase voltage transformer 4 adopts a full-insulation structure, adopts a gas insulation mode to replace the traditional cast insulation 4PT combined voltage transformer, places an iron core coil in the closed metal shell 1, and fills insulating gas in the shell 1 for insulation. The insulation mode can recover automatically after pure air gap breakdown occurs.
The cable laying connection mode that this technical scheme adopted can be suitable for the high-voltage terminal of different structures such as insulating sleeve, interior awl plug-in insulation socket, outer awl plug-in insulation socket, and the high-voltage terminal of the structure screen cloth of above-mentioned difference is dismantled and changed to the convenience as required, need not scrap whole mutual-inductor.
Claims (6)
1. A gas-insulated three-phase 4PT combined voltage transformer comprises a shell, wherein a secondary junction box is arranged on the outer side of the shell, three unidirectional voltage transformers and a zero-sequence voltage transformer are arranged in the shell, three primary high-voltage ends correspondingly connected with the unidirectional voltage transformers and two grounded primary high-voltage ends connected with the zero-sequence voltage transformers are arranged on the outer side of the shell, and the gas-insulated three-phase 4PT combined voltage transformer is characterized in that one primary terminal of each unidirectional voltage transformer is connected with the corresponding primary high-voltage end, the other primary terminal of each unidirectional voltage transformer is connected in parallel and is connected with one primary terminal of the zero-sequence voltage transformer, and the other primary terminal of the zero-sequence voltage transformer is connected with the grounded high-voltage primary end; each one-way voltage transformer is provided with three groups of secondary windings, the zero sequence voltage transformer is provided with three groups of secondary windings, and one wiring terminal of the first group of secondary windings of the three one-way voltage transformers is connected with a wire in parallel and is connected with one wiring terminal of the first group of secondary windings of the zero sequence voltage transformer; one terminal of a second group of secondary windings of the three unidirectional voltage transformers is connected with a wire in parallel and is connected with one terminal of a second group of secondary windings of the zero sequence voltage transformer, and a third group of secondary windings of the three unidirectional voltage transformers are connected in series to form an open triangle; the other terminals of the first and second groups of secondary windings of the three unidirectional voltage transformers are connected with the secondary junction box; the wiring terminals of the first and second groups of secondary windings of the zero sequence forging transformer, which are connected with the unidirectional voltage transformer, are connected with a secondary wiring box, and the other wiring terminal of the first and second groups of secondary windings of the zero sequence forging transformer is grounded; and a third group of secondary windings of the zero sequence voltage transformer is connected with the grounding monitoring relay.
2. The gas-insulated three-phase 4PT combined voltage transformer of claim 1, wherein the inside of the shell is a closed space, the inside of the shell is filled with insulating gas, and a density relay is installed on the outside of the shell.
3. A gas insulated three phase 4PT combined voltage transformer as claimed in claim 2, wherein the density relay has a signal interface.
4. The gas-insulated three-phase 4PT combined potential transformer of claim 2, characterized in that the insulating gas is SF6 or a mixed gas of SF6 and N2, and the pressure of the insulating gas is 0.2MPa-0.35 MPa.
5. A gas insulated three phase 4PT combined voltage transformer as claimed in claim 1 wherein a mounting flange is provided on the top of the housing, and the primary high voltage terminal and the grounded primary high voltage terminal are connected to the flange.
6. The gas-insulated three-phase 4PT combined voltage transformer of claim 1, wherein the connection of the primary high voltage terminal and the shell is one of an insulation sleeve, an inner cone plug-in insulation socket and an outer cone plug-in insulation socket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111448066.3A CN114141511A (en) | 2021-11-30 | 2021-11-30 | Gas-insulated three-phase 4PT combined voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111448066.3A CN114141511A (en) | 2021-11-30 | 2021-11-30 | Gas-insulated three-phase 4PT combined voltage transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114141511A true CN114141511A (en) | 2022-03-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111448066.3A Pending CN114141511A (en) | 2021-11-30 | 2021-11-30 | Gas-insulated three-phase 4PT combined voltage transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114141511A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201440374U (en) * | 2008-12-30 | 2010-04-21 | 大连金业电力设备有限公司 | 10kV outdoor ultra-low frequency oscillation over-current suppression combinational voltage transformer |
| CN201449877U (en) * | 2009-07-14 | 2010-05-05 | 中山市泰峰电气有限公司 | Gas-insulated type voltage transformer |
| WO2019149460A1 (en) * | 2018-01-31 | 2019-08-08 | Siemens Aktiengesellschaft | Electric device with intermediate piece |
| CN110600251A (en) * | 2019-09-27 | 2019-12-20 | 国网浙江省电力有限公司舟山供电公司 | Combined voltage transformer with zero sequence voltage output function |
| CN210467473U (en) * | 2019-09-23 | 2020-05-05 | 科誉德电气（苏州）有限公司 | Small-size large-capacity primary-secondary fusion voltage transformer |
| CN112489956A (en) * | 2020-11-20 | 2021-03-12 | 贵州电网有限责任公司 | Three-phase anti-resonance voltage transformer |
-
2021
- 2021-11-30 CN CN202111448066.3A patent/CN114141511A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201440374U (en) * | 2008-12-30 | 2010-04-21 | 大连金业电力设备有限公司 | 10kV outdoor ultra-low frequency oscillation over-current suppression combinational voltage transformer |
| CN201449877U (en) * | 2009-07-14 | 2010-05-05 | 中山市泰峰电气有限公司 | Gas-insulated type voltage transformer |
| WO2019149460A1 (en) * | 2018-01-31 | 2019-08-08 | Siemens Aktiengesellschaft | Electric device with intermediate piece |
| CN210467473U (en) * | 2019-09-23 | 2020-05-05 | 科誉德电气（苏州）有限公司 | Small-size large-capacity primary-secondary fusion voltage transformer |
| CN110600251A (en) * | 2019-09-27 | 2019-12-20 | 国网浙江省电力有限公司舟山供电公司 | Combined voltage transformer with zero sequence voltage output function |
| CN112489956A (en) * | 2020-11-20 | 2021-03-12 | 贵州电网有限责任公司 | Three-phase anti-resonance voltage transformer |
Non-Patent Citations (1)
| Title |
|---|
| 汤继东;: "中压系统电压互感器的选用及铁磁谐振的应对", 电气工程应用, no. 02, pages 1 - 8 * |
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Application publication date: 20220304 |