CN114050041A - High-voltage bushing integrated with low-power-consumption current transformer coil - Google Patents
High-voltage bushing integrated with low-power-consumption current transformer coil Download PDFInfo
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- CN114050041A CN114050041A CN202111361375.7A CN202111361375A CN114050041A CN 114050041 A CN114050041 A CN 114050041A CN 202111361375 A CN202111361375 A CN 202111361375A CN 114050041 A CN114050041 A CN 114050041A
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- low
- coil
- power
- voltage bushing
- consumption
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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
- H01F38/28—Current transformers
- H01F38/30—Constructions
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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
- H01F27/32—Insulating of coils, windings, or parts thereof
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The invention relates to a high-voltage bushing integrated with a low-power-consumption current transformer coil, which comprises a copper bar, a plurality of iron cores, a plurality of low-power-consumption coils and a plurality of shielding devices. The copper bar bears the main loop current, the iron core surrounds the copper bar to form a closed loop structure, the low-power-consumption coil is wound on the iron core and penetrates out of the sleeve through the first wire outlet terminal, the shielding device is located on the outer side of the coil and is grounded through the second wire outlet terminal, and the low-power-consumption coil and the shielding device are all poured in the epoxy resin material. Compared with a feed-through structure, the low-power-consumption coil is integrated in the high-voltage bushing, has the advantages of smaller volume, higher integration level and better economy, and accords with the development trend of the power industry.
Description
Technical Field
The invention relates to the technical field of switch equipment, in particular to a high-voltage bushing integrated with a low-power-consumption current transformer coil.
Background
The low-power-consumption current transformer is based on a Faraday electromagnetic induction principle, converts a current signal into a voltage signal through the sampling resistor, and can be applied to the fields of metering, measuring and protecting of an electric power system.
A low power consumption current transformer is one form of electronic current transformer. The traditional electromagnetic mutual inductor is easily interfered by an external magnetic field, has the risks of overvoltage and secondary side open circuit caused by ferromagnetic resonance, and can cause equipment damage and even endanger personal safety. Compared with the prior art, the low-power-consumption current transformer has the advantages of small size, high precision and large measurement range, does not have ferromagnetic resonance and open circuit risks, and has great significance for the development of the power industry.
In practical application, the existing low-power current transformer mostly adopts a through structure separated from a sleeve, does not realize integrated deep fusion and does not accord with the development direction of primary and secondary fusion of the switch equipment. Therefore, the high-voltage bushing integrated with the low-power-consumption current transformer coil has the advantages of being smaller in size, higher in integration level and better in economical efficiency.
Disclosure of Invention
The invention relates to a high-voltage bushing integrated with a low-power-consumption current transformer coil, which comprises a copper bar, a plurality of iron cores, a plurality of low-power-consumption coils and a plurality of shielding devices. The copper bar bears the main loop current, the iron core surrounds the copper bar to form a closed loop structure, the low-power-consumption coil is wound on the iron core and penetrates out of the iron core through a plurality of first wire outgoing terminals, the shielding device is located on the outer side of the coil and is grounded through a second wire outgoing terminal, and the shielding device and the low-power-consumption coil are all poured in the epoxy resin material to form the high-voltage bushing.
The high-voltage bushing integrated with the low-power-consumption current transformer coil comprises a copper bar, a plurality of iron cores, a plurality of coils and a plurality of shielding devices, and is poured in an epoxy resin material to form the high-voltage bushing;
the copper bar bears the current of the main loop; the iron core surrounds the copper rod to form a closed loop structure; the low-power-consumption coil is wound on the iron core and is led out through a first wire outlet terminal; the shielding device is positioned outside the coil and is led out of the grounding end through the second wire outlet terminal.
Furthermore, the coil acquires an induced current signal of the main loop current carried by the copper bar, and after the induced current signal is transmitted from the high-voltage bushing through the first wire outlet terminal, the current signal is converted into a voltage signal through the sampling resistor and is transmitted to the acquisition device to be used as a phase current and/or a synthesized zero-sequence current.
Further, according to actual precision and insulation requirements, the plurality of coils 3 are wound on the same iron core or wound on different iron cores respectively.
Furthermore, the iron core is made of an iron-nickel alloy steel sheet, so that the magnetic conductivity is high, the measurement precision and range can be ensured, and the power consumption of secondary side signal processing is reduced.
Furthermore, when the coil is wound on the same iron core, a polarity-reducing winding method is adopted, and magnetic field saturation under fault current is reduced so as to improve measurement accuracy.
Further, the shielding device covers the coil, and a structure that shielding is arranged in sections or a structure that shielding is arranged integrally is adopted.
The technical scheme of the invention has the following beneficial technical effects:
1) compared with the traditional electromagnetic type mutual inductor, the low-power-consumption coil is integrated in the high-voltage bushing to form the current mutual inductor, and the current mutual inductor has the advantages of small size, high precision and large measurement range, and does not have ferromagnetic resonance and open-circuit risks.
2) Compared with a feed-through structure, the low-power-consumption coil is integrated in the high-voltage bushing, has the advantages of smaller volume, higher integration level and better economy, and accords with the development trend of the power industry.
Drawings
FIG. 1 is a high voltage bushing embodiment incorporating a low power current transformer coil;
fig. 2 shows a winding scheme of a low power consumption coil.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The invention provides an implementation scheme of a high-voltage bushing integrated with a low-power-consumption current transformer coil. With reference to fig. 1 and 2, the following is described:
a high-voltage bushing integrated with a low-power-consumption current transformer coil comprises a copper bar 1, an iron core 2, a low-power-consumption coil 3 and a shielding device 4. The copper bar 1 bears system current, the iron core 2 forms a closed loop structure around the copper bar, the low-power-consumption coil 3 is wound on the iron core 2 and penetrates out of the iron core 2 through the outgoing line terminal 31, the shielding device 4 is grounded through the outgoing line terminal 41 by adopting a structure that the low-power-consumption coil 3 and the box body wall are integrally shielded, and all the low-power-consumption coil 3 and the box body wall are poured in an epoxy resin material to form a high-voltage sleeve.
According to the electromagnetic induction law, the low-power-consumption coil 3 can obtain an induced current signal of the system current on the copper bar 1, after the induced current signal is transmitted from the high-voltage bushing through the plurality of first wire outlet terminals, the current signal is converted into a voltage signal through the sampling resistor and is transmitted to the acquisition device, and the function of acquiring phase current and/or synthesizing zero-sequence current by the low-power-consumption current transformer is realized so as to meet the measurement and protection requirements.
According to the actual precision and insulation requirements, the low-power coils 3 can be wound on the same iron core 2 and can be wound on different iron cores 2 respectively to form a phase sequence and/or a synthetic zero sequence.
The structure of the shielding device 4 depends on the installation positions of the low-power-consumption coil 3 and the high-voltage bushing, and a structure that shielding is arranged in a segmented mode can be adopted, and a structure that shielding is arranged integrally can be adopted.
The iron core is made of an iron-nickel alloy steel sheet, the magnetic conductivity is high, the measurement precision and range can be guaranteed, and the power consumption of secondary side signal processing is reduced.
When the coil is wound on the same iron core, a polarity-reducing winding method is adopted, and magnetic field saturation under fault current is reduced so as to improve measurement accuracy.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (6)
1. A high-voltage bushing integrated with a low-power-consumption current transformer coil is characterized by comprising a copper bar, a plurality of iron cores, a plurality of coils and a plurality of shielding devices, wherein the copper bar, the iron cores, the coils and the shielding devices are poured in an epoxy resin material to form the high-voltage bushing;
the copper bar bears the current of the main loop; the iron core surrounds the copper rod to form a closed loop structure; the low-power-consumption coil is wound on the iron core and is led out through a first wire outlet terminal; the shielding device is positioned outside the coil and is led out of the grounding end through the second wire outlet terminal.
2. The high voltage bushing integrated with a low power consumption current transformer coil as claimed in claim 1, wherein said coil obtains an induced current signal of a main loop current carried by a copper bar, and after said induced current signal is transmitted from the high voltage bushing through the first outlet terminal, the current signal is converted into a voltage signal by the sampling resistor and transmitted to the collecting device as a phase current and/or a synthetic zero sequence current.
3. The high voltage bushing integrated with a low power consumption current transformer coil as claimed in claim 1 or 2, wherein a plurality of said coils 3 are wound on the same core or wound on different cores respectively according to actual precision and insulation requirements.
4. The high-voltage bushing integrated with the low-power-consumption current transformer coil as claimed in claim 1 or 2, wherein the iron core is made of iron-nickel alloy steel sheets, and has high magnetic permeability, so that the measurement accuracy and range can be ensured, and the power consumption of secondary side signal processing can be reduced.
5. The high-voltage bushing integrated with a low-power-consumption current transformer coil as claimed in claim 1 or 2, wherein when the coil is wound on the same iron core, a polarity-reducing winding method is adopted to reduce magnetic field saturation under fault current so as to improve measurement accuracy.
6. The high voltage bushing integrated with a low power consumption current transformer coil as claimed in claim 1 or 2, wherein said shielding means covers the coil, and is constructed by arranging shielding sections or by arranging shielding as a whole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111361375.7A CN114050041A (en) | 2021-11-17 | 2021-11-17 | High-voltage bushing integrated with low-power-consumption current transformer coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111361375.7A CN114050041A (en) | 2021-11-17 | 2021-11-17 | High-voltage bushing integrated with low-power-consumption current transformer coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114050041A true CN114050041A (en) | 2022-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111361375.7A Pending CN114050041A (en) | 2021-11-17 | 2021-11-17 | High-voltage bushing integrated with low-power-consumption current transformer coil |
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| CN (1) | CN114050041A (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2159609Y (en) * | 1993-05-06 | 1994-03-23 | 洪邦明 | Capacitive tube |
| CN1084667A (en) * | 1992-09-23 | 1994-03-30 | 杜娟 | Built-in casing current transformer |
| EP0603857A1 (en) * | 1992-12-24 | 1994-06-29 | Kommanditgesellschaft Ritz Messwandler GmbH & Co. | Ring core transformer with parasitic voltage shielding |
| CN2171152Y (en) * | 1993-10-11 | 1994-07-06 | 周干国 | Dry type casing current mutual-inductor |
| JPH07220963A (en) * | 1994-02-07 | 1995-08-18 | Mitsubishi Electric Corp | Current transformer |
| CN2265582Y (en) * | 1996-04-12 | 1997-10-22 | 苏仲衡 | Outdoor dry current transformer |
| CN2577421Y (en) * | 2002-11-05 | 2003-10-01 | 沈阳互感器厂（有限公司） | Dry current transformer |
| CN201868219U (en) * | 2010-12-06 | 2011-06-15 | 保定天威集团有限公司 | Secondary leading-out terminal block for mutual inductor |
| CN202120708U (en) * | 2011-06-17 | 2012-01-18 | 赫兹曼电力（广东）有限公司 | High-voltage sleeve of oil-immersed transformer |
| CN202473586U (en) * | 2012-03-20 | 2012-10-03 | 天津市泰莱电力设备技术有限公司 | Insulation structure of current transformer for electric locomotive |
| CN202711940U (en) * | 2012-05-18 | 2013-01-30 | 平高集团有限公司 | High voltage sleeve pipe for current transformer |
| CN203607237U (en) * | 2013-11-28 | 2014-05-21 | 苏州九正电工有限公司 | Current transformer test device of generator wire outlet casing |
-
2021
- 2021-11-17 CN CN202111361375.7A patent/CN114050041A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1084667A (en) * | 1992-09-23 | 1994-03-30 | 杜娟 | Built-in casing current transformer |
| EP0603857A1 (en) * | 1992-12-24 | 1994-06-29 | Kommanditgesellschaft Ritz Messwandler GmbH & Co. | Ring core transformer with parasitic voltage shielding |
| CN2159609Y (en) * | 1993-05-06 | 1994-03-23 | 洪邦明 | Capacitive tube |
| CN2171152Y (en) * | 1993-10-11 | 1994-07-06 | 周干国 | Dry type casing current mutual-inductor |
| JPH07220963A (en) * | 1994-02-07 | 1995-08-18 | Mitsubishi Electric Corp | Current transformer |
| CN2265582Y (en) * | 1996-04-12 | 1997-10-22 | 苏仲衡 | Outdoor dry current transformer |
| CN2577421Y (en) * | 2002-11-05 | 2003-10-01 | 沈阳互感器厂（有限公司） | Dry current transformer |
| CN201868219U (en) * | 2010-12-06 | 2011-06-15 | 保定天威集团有限公司 | Secondary leading-out terminal block for mutual inductor |
| CN202120708U (en) * | 2011-06-17 | 2012-01-18 | 赫兹曼电力（广东）有限公司 | High-voltage sleeve of oil-immersed transformer |
| CN202473586U (en) * | 2012-03-20 | 2012-10-03 | 天津市泰莱电力设备技术有限公司 | Insulation structure of current transformer for electric locomotive |
| CN202711940U (en) * | 2012-05-18 | 2013-01-30 | 平高集团有限公司 | High voltage sleeve pipe for current transformer |
| CN203607237U (en) * | 2013-11-28 | 2014-05-21 | 苏州九正电工有限公司 | Current transformer test device of generator wire outlet casing |
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