CN115863034B - Voltage transformer iron core structure - Google Patents
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- CN115863034B CN115863034B CN202211511767.1A CN202211511767A CN115863034B CN 115863034 B CN115863034 B CN 115863034B CN 202211511767 A CN202211511767 A CN 202211511767A CN 115863034 B CN115863034 B CN 115863034B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 238000004804 winding Methods 0.000 claims abstract description 65
- 238000009413 insulation Methods 0.000 claims description 48
- 239000002184 metal Substances 0.000 claims description 35
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- 238000004519 manufacturing process Methods 0.000 description 11
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- 230000005540 biological transmission Effects 0.000 description 4
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- 239000012792 core layer Substances 0.000 description 2
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- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
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Abstract
The invention belongs to the technical field of voltage transformers and provides a voltage transformer iron core structure, wherein the circular section of the voltage transformer is changed into a vertical elliptical section so as to reduce the width of a product, and the iron core section adopts an R-shaped iron core which is wound discontinuously and continuously in order to obtain a better effect; the area of the stepped circumscribing circular section and the area of the circumscribing elliptical section which are wound in a grading manner have a fixed proportion relation smaller than 1 with the circumscribing circular area and the circumscribing elliptical area, so that the invention is also applicable to the voltage transformer with the stepped section which is wound in a grading manner; the invention is mainly applied to the grounding voltage transformers with the air cabinet 20Hz semi-insulating structure and the full-insulating structure, and can solve the problem that the transformers with overlarge widths cannot be installed; the C-GIS inflatable cabinet voltage transformer can solve the problems that the voltage transformer meeting the requirement of 1.9Um inflection point of the national network has too large width and cannot be manufactured due to multiple windings, high precision and large capacity; all switch cabinets are miniaturized and improved, and the requirement of the width of the cabinet body is reduced.
Description
Technical Field
The invention belongs to the technical field of voltage transformers, and particularly relates to a voltage transformer iron core structure.
Background
The high-voltage switch equipment is mainly used for controlling and protecting a power system, is very important power transmission and distribution equipment, and is continuously developed towards high reliability, high safety, no maintenance and the like. Meanwhile, along with the continuous reduction of land resources, in order to save the land of a transformer substation and reduce the investment, the miniaturization of the switch cabinet is increasingly receiving attention from the market. For this reason, the realization of miniaturization of the switchgear is currently the direction of development of new products in the electrotechnical manufacturing industry, in particular in the switchgear manufacturing industry. The method has the advantages that the method has wide sea area and long coastline in China, has huge potential in developing offshore wind power, and is one of main directions of development of the power industry in China. The development of offshore wind power can bring opportunities for promoting local economic development, can accelerate energy transformation in coastal areas, can effectively ensure energy safety in China, and is beneficial to promoting leading edge technical innovation. The offshore wind power project in China has great significance for the social development in China, and therefore, the offshore wind power project in China needs to be promoted greatly. The flexible low-frequency power transmission technology is a key point about success and failure of offshore wind power projects, and the 12kV and 40.5kV20Hz low-frequency voltage transformers are equipment for providing voltage signals for electric energy metering and relay protection devices in a power system of the flexible low-frequency power transmission project, and are important links of the flexible low-frequency power transmission project of the offshore wind power projects.
Due to the continuous development of economic globalization, the development of power distribution houses in China also faces the competition of foreign high-quality products, and imported high-voltage power distribution cabinets occupy half-wall river mountain in the industry of the high-voltage power distribution cabinets in China because of the excellent quality of the imported high-voltage power distribution cabinets. The C-GIS inflatable cabinet is combined with the sulfur hexafluoride air chamber by adopting air insulation, has the characteristics of compact structure, flexible operation, reliable linkage, expandability and the like, covers 12kV, 24kV, 40.5kV and other voltage levels, and is suitable for distribution automation. Can provide a satisfactory technical solution for various application occasions (especially places with severe environments) and different user requirements. The system can be used for small secondary substations, switching stations, box substations, residential communities, industrial and mining enterprises and large markets in power systems, and is particularly suitable for places with high electricity requirements such as airports, subways, railways and the like. In recent years, domestic switch cabinet enterprises strive for phase development and production, and at present, only a few enterprises in China can perform conversion production according to foreign technology as a metal armoured voltage transformer for a C-GIS charging cabinet for measurement and protection, but the capacity of the product is smaller, the inflection point voltage of excitation characteristics is only 1.9U1n (rated voltage), the requirement of a national power grid 1.9um (highest voltage of equipment) is not met, the domestic requirement cannot be completely met, and the popularization and the application of the C-GIS charging cabinet are limited.
In summary, in certain specific occasions, the voltage transformer is limited in installation position, especially in the width direction of the switch cabinet, so that the situation that the voltage transformer is difficult to manufacture by the traditional design method is formed, and the problems that the switch cabinet is miniaturized, the cabinet width is narrowed, and the existing width transformer is difficult to install exist; the 10-35kV voltage transformer which has the advantages of multiple windings, high precision and large capacity and meets the inflection point requirement of the 1.9Um iron core of the national network is more and more required, and the volume of the voltage transformer is larger and larger, so that the width of the existing cabinet type is standard, the width of the existing cabinet type cannot be widened, the production difficulty of the voltage transformer is increased, and the problem of great difficulty is brought to complete factories and transformer manufacturing factories; the product cost is unacceptably high and difficult to manufacture, the wire resistance and leakage reactance are greatly increased in the use process of the low-frequency air insulation cabinet of 16.7Hz, 20Hz and the like, the output capacity is greatly reduced under the same precision requirement, and the problems of difficulty in meeting the use requirement, multi-winding, high precision, large capacity and the national net 1.9Um requirement and particularly great manufacturing difficulty are solved; the C-GIS inflatable cabinet body is narrower, the voltage transformer with the fuse has the characteristics that the width is narrow and the length is long except for requiring metal armoring, the widest width of the 35kV C-GIS inflatable cabinet metal armoring voltage transformer is only 240mm, three windings 50VA0.2 levels which are urgently needed by users are provided, and the voltage transformer meeting the requirement of 1.9Um inflection point of the national grid can be produced by nearly no manufacturer at home and abroad due to the limited width, so that the popularization and the use of the C-GIS inflatable cabinet with excellent performance in China are seriously influenced. Therefore, there is an urgent need to develop a usable product by using an innovative method, and the present invention proposes a voltage transformer core structure to solve the above-mentioned problems.
Disclosure of Invention
The invention provides a voltage transformer iron core structure, which aims to solve the problem that the width of a voltage transformer provided by the background technology is limited by the width of a cabinet body, so that the voltage transformer cannot be designed and manufactured.
The invention is realized in such a way that a voltage transformer iron core structure is realized, 1. The voltage transformer comprises a semi-insulating structure grounding voltage transformer, wherein a primary winding head end terminal A is fixedly arranged at the top of the semi-insulating structure grounding voltage transformer, a plurality of pairs of secondary winding terminals a and N and a pair of residual voltage winding terminals da and dn are fixedly arranged at one side of the bottom of the semi-insulating structure grounding voltage transformer, and a primary winding tail end terminal N is fixedly arranged at the other side of the bottom of the semi-insulating structure grounding voltage transformer;
the iron core cross section of semi-insulating structure ground voltage transformer is the R shape iron core, the iron core cross section of R shape iron core is vertical oval cross section, the iron core upper prop of semi-insulating structure ground voltage transformer is equipped with continuous winding's secondary winding and primary winding in proper order, and is a plurality of semi-insulating structure ground voltage transformer is inside the air cabinet along the even interval distribution of horizontal direction, semi-insulating structure ground voltage transformer and air cabinet bottom plate fixed connection.
Preferably, a primary terminal A of the semi-insulating structure grounding voltage transformer is connected with a primary high-voltage bus at the inner upper part of the air cabinet, and a primary terminal N of the semi-insulating structure grounding voltage transformer is electrically connected with ground;
secondary terminals a and n of the semi-insulating structure grounding voltage transformer are electrically connected with the electric energy meter and the voltmeter;
and the residual voltage terminals da and dn of the semi-insulating structure grounding voltage transformer are electrically connected with the relay protection device.
Preferably, the iron core section of the semi-insulating structure grounding voltage transformer is any one of an R-shaped iron core which is wound in a non-grading continuous mode and a stepped section iron core which is wound in a grading mode.
The iron core structure of the voltage transformer further comprises a full-insulation structure grounding voltage transformer, wherein two opposite primary winding terminals A and N are fixedly arranged at the top of the full-insulation structure grounding voltage transformer, and a plurality of pairs of secondary winding terminals a and N and a pair of residual voltage winding terminals da and dn are fixedly arranged at one side of the bottom of the full-insulation structure grounding voltage transformer;
the iron core cross section of full insulation structure ground voltage transformer is the R shape iron core, the iron core cross section of R shape iron core is vertical oval cross section, the iron core upper prop of full insulation structure ground voltage transformer is equipped with continuous winding's secondary winding in proper order and primary winding, and is equipped with insulating interval between primary winding and the secondary winding, a plurality of full insulation structure ground voltage transformer is inside the air tank along the even interval distribution of horizontal direction, full insulation structure ground voltage transformer and air tank bottom plate fixed connection.
Preferably, a primary terminal A of the all-insulation structure grounding voltage transformer is connected with a primary high-voltage bus at the inner upper part of the air cabinet, and a primary terminal N of the all-insulation structure grounding voltage transformer is electrically connected with ground;
the secondary terminals a and n of the all-insulation structure grounding voltage transformer are electrically connected with the electric energy meter and the voltmeter;
and the residual voltage terminals da and dn of the all-insulation structure grounding voltage transformer are electrically connected with the relay protection device.
Preferably, the iron core section of the all-insulation structure grounding voltage transformer is any one of an R-shaped iron core which is wound discontinuously and continuously and a stepped section iron core which is wound in a grading manner.
The voltage transformer iron core structure further comprises a semi-insulating structure metal shell grounding voltage transformer, wherein one side of the top of the semi-insulating structure metal shell grounding voltage transformer is fixedly and horizontally provided with a primary winding head end terminal A with conical solid insulation, and one side of the bottom of the semi-insulating structure metal shell grounding voltage transformer is fixedly provided with a primary winding tail end terminal N, a plurality of pairs of secondary winding terminals a and N and a pair of residual voltage winding terminals da and dn;
the iron core cross section of semi-insulating structure metal casing ground connection voltage transformer is the R shape iron core, the iron core cross section of R shape iron core is vertical oval cross section, semi-insulating structure metal casing ground connection voltage transformer iron core upper prop is equipped with continuous winding's secondary winding and primary winding in proper order, and a plurality of semi-insulating structure metal casing ground connection voltage transformer is inside at C-GIS inflatable cabinet along the even interval distribution of horizontal direction, semi-insulating structure metal casing ground connection voltage transformer and C-GIS inflatable cabinet board fixed connection.
Preferably, a primary winding head end terminal A with solid cone insulation horizontally arranged on one side of the top of the semi-insulating structure metal shell grounding voltage transformer is in butt joint with an inner cone socket through a voltage transformer plug and is connected with a primary high-voltage bus in an SF gas chamber, and a primary tail end terminal N of the semi-insulating structure metal shell grounding voltage transformer is electrically connected with ground;
the secondary terminals a and n of the semi-insulating structure metal shell grounding voltage transformer are electrically connected with the electric energy meter and the voltmeter;
and the residual voltage terminals da and dn of the semi-insulating structure metal shell grounding voltage transformer are electrically connected with the relay protection device.
Preferably, the iron core section of the semi-insulating structure metal shell grounding voltage transformer is any one of an R-shaped iron core which is wound in a non-grading continuous mode and a stepped section iron core which is wound in a grading mode.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention changes the circular section of the voltage transformer into a vertical elliptical section so as to reduce the width of the product, although the width of the product is increased in the height and length directions of the product, the cabinet is placed side by side, the installation positions in the height and length directions of the product are provided with sufficient margin, an R-shaped iron core which is wound discontinuously and continuously is adopted in order to obtain better effect, and the areas of the stepped circumscribed circular section and the circumscribed elliptical section which are wound in a grading manner are equal to the areas of the circumscribed circular section and the circumscribed elliptical section, and after the ratio of the radius of the circle to the major axis and the minor axis of the ellipse and the grading number are determined, the fixed ratio relation smaller than 1 is provided, and the fixed area utilization rate is provided, so that the invention is also suitable for the voltage transformer with the stepped section which is wound in a grading manner;
2. the invention is suitable for being used in low-frequency air insulated cabinets of 16.7Hz, 20Hz and the like, solves the problems that the volume of the product is unacceptably large and is difficult to manufacture, the resistance of a wire and leakage reactance are greatly increased, the output capacity is greatly reduced under the same precision requirement, the use requirement is difficult to meet, the requirement of multiple windings, high precision and large capacity are also difficult to meet, and the requirement of national net 1.9Um is met, and the manufacturing difficulty is extremely high;
3. the invention is suitable for the voltage transformer with the widest width of 240mm of the 35kV C-GIS inflatable cabinet metal armor voltage transformer, three windings 50VA0.2 levels which are urgently needed by users and meet the requirement of 1.9Um inflection points of national nets, and the circular section of the voltage transformer is changed into a vertical elliptical section so as to reduce the width of products, thereby being suitable for the relatively narrow cabinet body of the C-GIS inflatable cabinet and being convenient for popularization and use of the C-GIS inflatable cabinet in China;
4. the voltage transformer is suitable for miniaturization improvement of the existing standard-width cabinet, and when the cabinet width is narrowed, the voltage transformer is suitable for and convenient to install, and brings convenience for complete factories and transformer manufacturers.
Drawings
Fig. 1 is a schematic diagram of a ground voltage transformer with a semi-insulating structure according to the present invention;
fig. 2 is a schematic structural diagram of a ground voltage transformer with an all-insulation structure in the present invention;
FIG. 3 is a schematic diagram of a semi-insulating metal shell grounding voltage transformer according to the present invention;
FIG. 4 is a schematic diagram of the installation space of the semi-insulating grounding voltage transformer in the present invention;
FIG. 5 is a schematic diagram of the installation space of the all-insulated grounding voltage transformer in the invention;
FIG. 6 is a schematic diagram of the installation space of a semi-insulating metal shell grounding voltage transformer in the invention;
FIG. 7 is a graph of the relationship between the circular cross-sectional area of the R-shaped iron core and the circular cross-sectional area of the graded iron core in the present invention;
FIG. 8 is a graph showing the relationship between the elliptical cross-sectional area of the R-shaped core and the elliptical cross-sectional area of the graded core in the present invention
FIG. 9 is a schematic diagram of one embodiment of the present invention in which circles, ellipses, circles and ellipses are superimposed in area relationship;
FIG. 10 is a schematic diagram of another embodiment of the present invention in which circles, ellipses, circles and ellipses are superimposed in area relationship;
FIG. 11 is a schematic view of a reduction in insulation width of a core layer with a circular cross section in accordance with the present invention;
fig. 12 is a schematic view showing insulation width reduction of an elliptical section core layer in the present invention.
In the figure:
1. the semi-insulating structure is grounded to the voltage transformer;
2. the full-insulation structure is grounded to the voltage transformer;
3. the semi-insulating structure metal shell is grounded to the voltage transformer;
r: the radius of the circular section of the iron core;
a: major axis radius of ellipse;
b: the minor axis radius of the ellipse;
sy: the area of the circular section of the R-shaped iron core;
syc: the radius is r, the area of the cross section of the graded iron core of the circumscribing circle;
ky: fixed constant- -the area utilization of the graded core cross section;
st: the area of the elliptical cross section of the R-shaped iron core;
stc: the area of the cross section of the grading iron core with the long and short axes being a and b and the circumscribed ellipse;
kt: fixed constant- -utilization of the area of the graded elliptical core cross-section.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown.
The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The grounding voltage transformer commonly used in the current switch cabinet or the inflatable cabinet mainly has three forms, namely a semi-insulating grounding voltage transformer 1 with single-end high-voltage insulation, a full-insulating grounding voltage transformer 2 with two-end high-voltage insulation and a semi-insulating structure metal shell grounding voltage transformer 3. In the following, a low-frequency air insulation cabinet and a C-GIS air charging cabinet are taken as examples, and as shown in fig. 1, a semi-insulation structure ground voltage transformer 1 is shown, as shown in fig. 2, a full-insulation structure ground voltage transformer 2 is shown, as shown in fig. 3, a semi-insulation structure metal shell ground voltage transformer 3 is shown, the installation condition of the voltage transformer in the cabinet is shown in fig. 4, fig. 5 and fig. 6, fig. 4 is a installation space condition of the semi-insulation ground voltage transformer 1 in the cabinet, fig. 5 is a installation space condition of the full-insulation ground voltage transformer 2 in the cabinet, fig. 6 is a installation space condition of the semi-insulation structure metal shell ground voltage transformer 3 in the cabinet, and it can be clearly seen from fig. 4, fig. 5 and fig. 6 that the width of the cabinet limits the width of the transformer, and the length and the height of the cabinet have larger margins.
Because the cabinets are placed side-by-side, there is typically room for the cabinet in terms of height and length (depth). The invention changes the circular section of the voltage transformer into a vertical elliptical section so as to reduce the width of the product and increase the height and length directions of the product. For better effect the core cross section is a continuously wound R-shaped core with no grading. The stepped circumscribing circular section and the circumscribing elliptical section which are wound in a grading manner have a fixed proportion relation smaller than 1 after the proportion of the long axis to the short axis and the grading number are determined, and have a fixed area utilization rate, so that the invention is also suitable for the voltage transformer with the stepped section which is wound in a grading manner, as shown in figures 7 and 8.
Example 1:
the width of the existing mature products is reduced and improved so as to be suitable for the novel narrow cabinet type.
The circular area sc=pi r2, where r is the core circular cross-section radius, the elliptical area se=pi×a×b, where a is the elliptical major axis radius, and b is the elliptical minor axis radius, and sc=se, a=1.5b, the single-side reduction δ=0.184 r of the core width is shown in fig. 9.
If the section radius of the iron core of the original product is 50mm, the overall width of the iron core is reduced by 2δ=18.4 mm under the condition that the section area of the iron core is kept unchanged, that is to say, the width of the product can be reduced by 18.4mm under the condition that the performance of the product is basically unchanged in all aspects, the overall width of three phases can be reduced by 55mm, and the dimension of the product in the aspects of the height and length (depth) of the product is increased by 36.8mm, so that the normal use of the product is not influenced.
Example 2:
the product meeting the width requirement is improved in design of increasing windings, improving precision and enlarging output capacity.
The circular area sc=pir2, where r is the core circular section radius, the elliptical area se=piab, where a is the elliptical major axis radius, b is the elliptical minor axis radius, let the core section width unchanged, b=r, and the height elongated 1.5 times, a=1.5b, and the core elliptical cross-sectional area se=1.5sc, as shown in fig. 10, where the hatched portion is the core area increasing portion.
If the core section radius is 50mm, the core section area will be 78.5cm 2 Increased to 117.8cm 2 The increment of the sectional area of the iron core is 39.3cm under the condition of unchanged overall width of three phases 2 The height and the length (depth) of the voltage transformer are increased by 50mm under the condition that the size of the coil is kept relatively unchanged, the normal use of the product is not affected under the general condition, the number of turns of a primary secondary winding of the product is reduced by 1.5 times under the condition that the magnetic density is kept unchanged due to the increase of the area of the iron core, the winding positions which are increased can be used for increasing the winding wire diameter to reduce the winding impedance, improve the precision and the output capacity, and can be used for increasing the number of secondary windings and the relative number of turns of the winding to reduce the magnetic density of the iron core, so that the product meets the excitation performance requirement of 1.9Um of a national network.
Example 3:
for voltage transformers with thicker interlayer insulation and poorer partial discharge level of products.
Under the condition of the same iron core cross section area and the same product width K, the circular cross section iron core is improved to be an elliptical cross section iron core, the coil height can be shortened, and the coil height is reduced from c to d, so that the number of turns of each layer of primary winding, the interlayer voltage and the interlayer insulation thickness are reduced, and the partial discharge level of the product can be obviously improved. As shown in fig. 11 and 12, the increase in the number of layers due to the narrowing of the interlayer insulation can be compensated by the reduced portion position δ of the elliptical short axis, and as is clear from example 1, δ=0.18lr, r is the radius of the original circular cross section, as shown in fig. 9.
Example 4:
for the existing voltage transformer with a plurality of primary windings wound in parallel.
The circular section iron core is improved to be an elliptical section iron core, and due to the fact that the height of a coil is reduced, winding positions are reduced, as shown in fig. 11 and 12, the number of turns between primary winding layers is the same, and under the condition that interlayer voltage, interlayer insulation thickness and interlayer electric field are unchanged, the number of parallel windings can be reduced, the diameter of a single wire is increased, and cost and winding difficulty are reduced.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (9)
1. The utility model provides a voltage transformer iron core structure which characterized in that: the high-voltage transformer comprises a semi-insulating structure grounding voltage transformer (1), wherein a primary winding head end terminal A is fixedly arranged at the top of the semi-insulating structure grounding voltage transformer (1), a plurality of pairs of secondary winding terminals a and N and a pair of residual voltage winding terminals da and dn are fixedly arranged at one side of the bottom of the semi-insulating structure grounding voltage transformer (1), and a primary winding tail end terminal N is fixedly arranged at the other side of the bottom of the semi-insulating structure grounding voltage transformer;
the iron core cross section of semi-insulating structure ground voltage transformer (1) is the R shape iron core, the iron core cross section of R shape iron core is vertical oval cross section, the iron core upper prop of semi-insulating structure ground voltage transformer (1) is equipped with continuous winding's secondary winding and primary winding in proper order, and a plurality of semi-insulating structure ground voltage transformer (1) are inside the air cabinet along the even interval distribution of horizontal direction, semi-insulating structure ground voltage transformer (1) and air cabinet bottom plate fixed connection.
2. A voltage transformer core structure as claimed in claim 1, wherein: the primary terminal A of the semi-insulating structure grounding voltage transformer (1) is connected with a primary high-voltage bus at the inner upper part of the air cabinet, and the primary terminal N of the semi-insulating structure grounding voltage transformer (1) is electrically connected with the ground;
secondary terminals a and n of the semi-insulating structure grounding voltage transformer (1) are electrically connected with the electric energy meter and the voltmeter;
and the residual voltage terminals da and dn of the semi-insulating structure grounding voltage transformer (1) are electrically connected with the relay protection device.
3. A voltage transformer core structure as claimed in claim 2, wherein: the iron core section of the semi-insulating structure grounding voltage transformer (1) is any one of an R-shaped iron core which is wound discontinuously and continuously and a stepped section iron core which is wound in a grading manner.
4. A voltage transformer core structure as claimed in claim 1, wherein: the full-insulation structure grounding voltage transformer is characterized by further comprising a full-insulation structure grounding voltage transformer (2), wherein two opposite primary winding terminals A and N are fixedly arranged at the top of the full-insulation structure grounding voltage transformer (2), and a plurality of pairs of secondary winding terminals a and N and a pair of residual voltage winding terminals da and dn are fixedly arranged at one side of the bottom of the full-insulation structure grounding voltage transformer (2);
the iron core cross section of full insulation structure ground voltage transformer (2) is the R shape iron core, the iron core cross section of R shape iron core is vertical oval cross section, the iron core upper prop of full insulation structure ground voltage transformer (2) is equipped with continuous winding's in proper order secondary winding and primary winding, and is equipped with insulating interval between primary winding and the secondary winding, and is a plurality of full insulation structure ground voltage transformer (2) are inside the air cabinet along the even interval distribution of horizontal direction, full insulation structure ground voltage transformer (2) and air cabinet bottom plate fixed connection.
5. The voltage transformer core structure of claim 4, wherein: the primary terminal A of the all-insulation structure grounding voltage transformer (2) is connected with a primary high-voltage bus at the inner upper part of the air cabinet, and the primary terminal N of the all-insulation structure grounding voltage transformer (2) is electrically connected with the ground;
the secondary terminals a and n of the all-insulation structure grounding voltage transformer (2) are electrically connected with the electric energy meter and the voltmeter;
and the residual voltage terminals da and dn of the all-insulation structure grounding voltage transformer (2) are electrically connected with the relay protection device.
6. The voltage transformer core structure of claim 5, wherein: the iron core section of the all-insulation structure grounding voltage transformer (2) is any one of an R-shaped iron core which is wound discontinuously and continuously and a stepped section iron core which is wound in a grading manner.
7. A voltage transformer core structure as claimed in claim 1, wherein: the semi-insulating structure metal shell grounding voltage transformer (3) is characterized by further comprising a semi-insulating structure metal shell grounding voltage transformer (3), wherein one side of the top of the semi-insulating structure metal shell grounding voltage transformer (3) is fixedly and horizontally provided with a primary winding head end terminal A with conical solid insulation, and one side of the bottom of the semi-insulating structure metal shell grounding voltage transformer (3) is fixedly provided with a primary winding tail end terminal N, a plurality of pairs of secondary winding terminals a and N and a pair of residual voltage winding terminals da and dn;
the iron core cross section of semi-insulating structure metal casing ground connection voltage transformer (3) is the R shape iron core, the iron core cross section of R shape iron core is vertical oval cross section, semi-insulating structure metal casing ground connection voltage transformer (3) iron core upper prop is equipped with continuous winding's secondary winding and primary winding in proper order, and a plurality of semi-insulating structure metal casing ground connection voltage transformer (3) are along the even interval distribution of horizontal direction inside the C-GIS inflatable cabinet, semi-insulating structure metal casing ground connection voltage transformer (3) and C-GIS inflatable cabinet board fixed connection.
8. The voltage transformer core structure of claim 7, wherein: the primary winding head end terminal A with solid cone insulation horizontally arranged on one side of the top of the semi-insulating structure metal shell grounding voltage transformer (3) is in butt joint with the inner cone socket through a voltage transformer plug and is connected with a primary high-voltage bus in an SF6 air chamber, and the primary tail end terminal N of the semi-insulating structure metal shell grounding voltage transformer (3) is electrically connected with ground;
the secondary terminals a and n of the semi-insulating structure metal shell grounding voltage transformer (3) are electrically connected with the electric energy meter and the voltmeter;
and the residual voltage terminals da and dn of the semi-insulating structure metal shell grounding voltage transformer (3) are electrically connected with the relay protection device.
9. The voltage transformer core structure of claim 8, wherein: the iron core section of the semi-insulating structure metal shell grounding voltage transformer (3) is any one of an R-shaped iron core which is wound in a non-grading continuous mode and a stepped section iron core which is wound in a grading mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211511767.1A CN115863034B (en) | 2022-11-29 | 2022-11-29 | Voltage transformer iron core structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211511767.1A CN115863034B (en) | 2022-11-29 | 2022-11-29 | Voltage transformer iron core structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115863034A CN115863034A (en) | 2023-03-28 |
| CN115863034B true CN115863034B (en) | 2023-11-10 |
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| CN202211511767.1A Active CN115863034B (en) | 2022-11-29 | 2022-11-29 | Voltage transformer iron core structure |
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| US3173115A (en) * | 1962-10-26 | 1965-03-09 | Westinghouse Electric Corp | High voltage potential transformer |
| DE1638345A1 (en) * | 1968-03-16 | 1970-08-27 | Koch & Sterzel Wandler Und Tra | Single pole earthed cast resin insulated voltage transformer |
| CN101521103A (en) * | 2008-11-14 | 2009-09-02 | 厦门大一互科技有限公司 | Grounding method of primary coil N end of relatively semi-insulating electromagnetic voltage transformer and iron core |
| CN102290224A (en) * | 2011-05-11 | 2011-12-21 | 大连互感器有限公司 | Semi-enclosed semi-insulating built-in fuse-type three-phase voltage transformer |
| CN203444967U (en) * | 2013-08-14 | 2014-02-19 | 大连金业电力设备有限公司 | Three-phase four-wire split-assembling epoxy resin poured dry voltage transformer |
| CN203596267U (en) * | 2013-10-23 | 2014-05-14 | 安徽华能集团电器有限公司 | Internally voltage-equalized semi-insulating outdoor type voltage transformer |
| CN207068610U (en) * | 2017-07-31 | 2018-03-02 | 大连北方互感器集团有限公司 | Switch cubicle metering ground-type potential transformer |
| CN213546938U (en) * | 2020-11-09 | 2021-06-25 | 纳图智能科技(常州)有限公司 | Semi-insulating and all-insulating combined ring main unit |
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2022
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3173115A (en) * | 1962-10-26 | 1965-03-09 | Westinghouse Electric Corp | High voltage potential transformer |
| DE1638345A1 (en) * | 1968-03-16 | 1970-08-27 | Koch & Sterzel Wandler Und Tra | Single pole earthed cast resin insulated voltage transformer |
| CN101521103A (en) * | 2008-11-14 | 2009-09-02 | 厦门大一互科技有限公司 | Grounding method of primary coil N end of relatively semi-insulating electromagnetic voltage transformer and iron core |
| CN102290224A (en) * | 2011-05-11 | 2011-12-21 | 大连互感器有限公司 | Semi-enclosed semi-insulating built-in fuse-type three-phase voltage transformer |
| CN203444967U (en) * | 2013-08-14 | 2014-02-19 | 大连金业电力设备有限公司 | Three-phase four-wire split-assembling epoxy resin poured dry voltage transformer |
| CN203596267U (en) * | 2013-10-23 | 2014-05-14 | 安徽华能集团电器有限公司 | Internally voltage-equalized semi-insulating outdoor type voltage transformer |
| CN207068610U (en) * | 2017-07-31 | 2018-03-02 | 大连北方互感器集团有限公司 | Switch cubicle metering ground-type potential transformer |
| CN213546938U (en) * | 2020-11-09 | 2021-06-25 | 纳图智能科技(常州)有限公司 | Semi-insulating and all-insulating combined ring main unit |
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|---|---|
| CN115863034A (en) | 2023-03-28 |
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