CN115036115A - Body unit and electromagnetic voltage transformer - Google Patents
Body unit and electromagnetic voltage transformer Download PDFInfo
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- CN115036115A CN115036115A CN202210718850.XA CN202210718850A CN115036115A CN 115036115 A CN115036115 A CN 115036115A CN 202210718850 A CN202210718850 A CN 202210718850A CN 115036115 A CN115036115 A CN 115036115A
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- unit
- porcelain bushing
- oil storage
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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
- H01F38/26—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
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
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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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
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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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
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- Power Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
本发明涉及一种器身单元及电磁式电压互感装置，器身单元包括铁芯元件，分别套设铁芯元件的下部和上部的第一线圈元件、第二线圈元件，分别套设第一线圈元件、第二线圈元件的第一屏蔽元件、第二屏蔽元件，分别套设第一屏蔽元件、第二屏蔽元件的下绝缘元件和上绝缘元件。其优点在于，利用上绝缘元件和下绝缘元件，获得最佳的电场分布，使互感装置呈容性，有效地避免电磁式电压互感装置与断路器断口电容、线路对地分布电容等发生谐振，确保电网的安全运行；利用器身单元，可以缩小瓷套单元直径，减少油重和总重；上绝缘元件和下绝缘元件使产品具有良好的电气强度和绝缘性能以及低的介质损耗因数；克服了性能不稳定、暂态性能差和输出容量小的缺点。
The invention relates to a body unit and an electromagnetic voltage mutual inductance device. The body unit includes an iron core element. The element, the first shielding element and the second shielding element of the second coil element are respectively sleeved with the first shielding element, the lower insulating element and the upper insulating element of the second shielding element. The advantage is that the best electric field distribution is obtained by using the upper insulating element and the lower insulating element, so that the mutual inductance device is capacitive, and the resonance between the electromagnetic voltage mutual inductance device and the breaking capacitance of the circuit breaker, the distributed capacitance of the line to the ground, etc. Ensure the safe operation of the power grid; the use of the body unit can reduce the diameter of the porcelain sleeve unit, reduce the oil weight and total weight; the upper insulating element and the lower insulating element make the product have good electrical strength and insulation performance and low dielectric loss factor; overcome It has the disadvantages of unstable performance, poor transient performance and small output capacity.
Description
Technical Field
The invention relates to the technical field of high-voltage measurement and relay protection equipment, in particular to a device body unit and an electromagnetic voltage mutual inductance device.
Background
The voltage transformer is an indispensable device for power transmission and supply systems such as power plants and substations. Voltage transformers are devices used to transform voltages, similar to transformers. The power system needs to use a voltage transformer to collect voltage signals from a primary loop and provide the voltage signals for electric measurement, electric energy metering, relay protection and automatic devices.
The traditional electromagnetic voltage transformer has the characteristics of heavy weight and large volume, along with the development of an extra-high voltage power grid, the insulation strength requirement difficulty of the traditional electromagnetic voltage transformer is more and more high, so that the manufacturing cost of the ultrahigh voltage electromagnetic voltage transformer is high, the manufacturing difficulty of the ultrahigh voltage electromagnetic voltage transformer is high, the traditional electromagnetic voltage transformer is used for 220 KV and below power systems, and the traditional electromagnetic voltage transformer cannot be used in ultrahigh voltage power systems. Meanwhile, the electromagnetic voltage transformer is sensitive, so that ferromagnetic resonance is easily generated between the voltage transformer and a line capacitor, and the transformer is damaged.
The 550kV voltage transformer used in the ultra-high voltage measurement and relay protection equipment adopts a capacitor voltage transformer, but is easily influenced by factors such as environment temperature, power grid frequency and the like, and the error performance is unstable; and is affected by internal components resulting in poor transient performance and low output capacity.
At present, no effective solution is provided for the problems that the electromagnetic voltage transformer in the related technology cannot be suitable for an ultrahigh voltage power system, is easy to generate electromagnetic resonance, has large volume, high manufacturing cost, is easy to damage and the like.
Disclosure of Invention
The invention aims to provide a body unit and an electromagnetic voltage transformer aiming at the defects in the prior art, and aims to solve the problems that the electromagnetic voltage transformer in the related art cannot be applied to an ultrahigh voltage power system, is easy to generate magnetic resonance, is large in size, high in manufacturing cost, easy to damage and the like.
In order to achieve the purpose, the invention adopts the technical scheme that:
in a first aspect, there is provided a body unit, suitable for 550kV, for use in an electromagnetic voltage transformer, comprising:
iron core element
A first coil element sleeved on a lower portion of the core element;
a second coil element which is fitted over an upper portion of the core element;
the first shielding element is sleeved on the first coil element and is grounded;
the second shielding element is sleeved on the second coil element;
the lower insulating element is sleeved with the first shielding element and the first coil element;
and the upper insulating element is sleeved on the second shielding element and the second coil element.
In some of these embodiments, further comprising:
a first lead element provided inside the lower insulating element and connected to the first coil element and the low-voltage terminal, respectively;
and a second lead element disposed inside the upper insulating element and connected to the second coil element and the high-voltage terminal, respectively.
In some of these embodiments, further comprising:
a first balance element disposed between the core element and the first coil element;
a second balancing element disposed between the core element and the second coil element and connected opposite to the first balancing element, and a connection point of the first balancing element and the second balancing element is at the core element.
In a second aspect, there is provided an electromagnetic voltage transformer device, suitable for 550kV, comprising:
a base unit placed on a horizontal plane;
the lower porcelain bushing unit is arranged on the upper part of the base unit and is connected with the base unit;
the oil storage unit is arranged at the upper part of the lower porcelain sleeve unit and is connected with the lower porcelain sleeve unit;
the upper porcelain bushing unit is arranged at the upper part of the oil storage unit and is connected with the oil storage unit;
the expansion unit is arranged at the upper part of the upper porcelain bushing unit and is connected with the upper porcelain bushing unit;
the vessel body unit according to the first aspect, wherein the vessel body unit is disposed inside the lower porcelain bushing unit, the oil storage unit, and the upper porcelain bushing unit, and is connected to the base unit, the oil storage unit, and the expansion unit, respectively.
In some of these embodiments, the base unit comprises:
the base element is arranged on the horizontal plane and is connected with the lower porcelain bushing unit;
a first fixing member provided at an upper portion of the base member and connected with the body unit;
a ground element connected with the base element for grounding.
In some of these embodiments, the base unit further comprises:
and the valve element is arranged on the base element and used for discharging and supplementing oil to the electromagnetic voltage mutual inductance device.
In some of these embodiments, the lower bushing unit comprises:
a lower porcelain bushing element disposed at an upper portion of the base unit;
a first lower flange element disposed at a lower portion of the lower porcelain bushing element and connected with the base unit;
and the first upper flange element is arranged at the lower part of the upper porcelain sleeve element and is connected with the oil storage unit.
In some of these embodiments, the oil storage unit comprises:
the oil storage element is respectively connected with the lower porcelain bushing unit and the upper porcelain bushing unit;
and the second fixing element is arranged inside the oil storage element and is connected with the body unit.
In some of these embodiments, the upper insulator unit comprises:
an upper porcelain bushing element disposed at an upper portion of the oil storage unit;
the second lower flange element is arranged at the lower part of the upper porcelain sleeve element and is connected with the oil storage unit;
a second upper flange element disposed at an upper portion of the upper porcelain bushing element and connected with the expansion unit.
In some of these embodiments, the expansion unit comprises:
the expansion element is arranged at the upper part of the upper porcelain bushing unit and is connected with the upper porcelain bushing unit;
a primary terminal element connected with the expansion element for connection with a high voltage network;
a third fixing member provided at a lower portion of the expansion member and connected to the body unit;
a cover element disposed about the expansion element;
a window element disposed to the cover element for observing an oil level.
In some of these embodiments, further comprising:
and the wiring unit is arranged at the lower part of the base unit and is connected with the base unit.
In some of these embodiments, the wiring unit includes:
a connection box element provided at a lower portion of the base unit and connected with the base unit;
a junction element connected with the junction box element;
a secondary terminal element provided at an outer end of the connection box element and connected with the connection box element;
a secondary terminal block element connected with the connection block element.
In some of these embodiments, the wiring unit further comprises:
a compensation element disposed inside the junction box element.
In some of these embodiments, further comprising:
and the fastening unit is arranged at the connecting positions among the base unit, the lower porcelain sleeve unit, the oil storage unit, the upper porcelain sleeve unit, the expansion unit and the body unit.
In some of these embodiments, the fastening unit comprises:
and the fastening elements are respectively arranged at the connecting positions among the base unit, the lower porcelain bushing unit, the oil storage unit, the upper porcelain bushing unit, the expansion unit and the body unit.
By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:
according to the device body unit and the electromagnetic voltage mutual inductance device, the optimal electric field distribution is obtained by utilizing the upper insulating element and the lower insulating element, so that the mutual inductance device is capacitive, the electromagnetic voltage mutual inductance device is effectively prevented from resonating with a breaker fracture capacitor, a line-to-ground distribution capacitor and the like, and the safe operation of a power grid is ensured; by utilizing the body unit, the diameter of the porcelain bushing unit can be reduced, and the oil weight and the total weight are reduced; the upper insulating element and the lower insulating element enable the product to have good electrical strength and insulating performance and low dielectric loss factor; the defects of unstable error performance, poor transient performance and small output capacity caused by the influence of the environmental temperature and the power grid frequency on the capacitor of the capacitor voltage transformer are overcome.
Drawings
Fig. 1 is a schematic view of a body unit according to an embodiment of the present invention;
FIGS. 2 a-2 b are schematic diagrams of an electromagnetic voltage transformer apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic view of a base unit according to an embodiment of the invention;
fig. 4 is a schematic view of a lower porcelain bushing unit according to an embodiment of the present invention;
FIG. 5 is a schematic view of an oil storage unit according to an embodiment of the invention;
fig. 6 is a schematic view of an upper porcelain bushing unit according to an embodiment of the present invention;
FIGS. 7 a-7 b are schematic views of an expansion unit according to an embodiment of the invention;
fig. 8a to 8b are schematic views of a wiring connection unit according to an embodiment of the present invention.
Wherein the reference numbers are: 100. a base unit; 101. a base element; 102. a first fixing element;
200. a lower porcelain bushing unit; 201. a lower porcelain sleeve element; 202. a first lower flange element; 203. a first upper flange element;
300. an oil storage unit; 301. an oil storage element;
400. an upper porcelain bushing unit; 401. an upper porcelain bushing element; 402. a second lower flange member; 403. a second upper flange element;
500. an expansion unit; 501. an expansion element; 502. a primary terminal element; 503. a third fixing element; 504. a cover member; 505. a window element;
600. a body unit; 601. a core element; 602. a first coil element; 603. a second coil element; 604. a first shielding element; 605. a second shielding element; 606. a lower insulating element; 607. an upper insulating element;
700. a wiring unit; 701. a wiring member; 702. a connection box element; 703. a secondary terminal element; 704. a secondary terminal block element.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive efforts based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Example 1
The present embodiment relates to a body unit of the present invention.
An exemplary embodiment of the present invention, as shown in fig. 1, a body unit 600, suitable for 550kV, for use in an electromagnetic voltage transformer, comprises a core element 601, a first coil element 602, a second coil element 603, a first shielding element 604, a second shielding element 605, a lower insulating element 606 and an upper insulating element 607. Wherein, the first coil element 602 is sleeved on the lower portion of the iron core element 601; the second coil element 603 is sleeved on the upper part of the iron core element 601; the first shielding element 604 is disposed around the first coil element 602, and the first shielding element 604 is grounded; the second shielding element 605 is disposed around the second coil element 603; the lower insulating element 606 is sleeved with the first shielding element 604 and the first coil element 602; the upper insulating element 607 is sleeved with the second shielding element 605 and the second coil element 603.
The core element 601 is a rectangular core comprising a lower leg and an upper leg. The first coil element 602 is sleeved with the lower core column, and the second coil element 603 is sleeved with the upper core column. The rated voltage is distributed between the first coil element 602 and the second coil element 603.
The first coil element 602 includes a primary coil and a secondary coil. The primary coil is sleeved with the lower core column, and the secondary coil is sleeved with the primary coil, is located inside the first shielding element 604, and passes through the first shielding element 604.
The second coil element 603 comprises a primary coil. The primary coil is sleeved on the upper core column, located inside the second shielding element 605, and passes through the second shielding element 605.
The first shielding element 604 is disposed around the first coil element 602, that is, viewed from a cross-sectional plane of the core element 601, the lower core column of the core element 601, the first coil element 602, and the first shielding element 604 are sequentially arranged from inside to outside.
Wherein the first shielding element 604 is grounded.
In some of these embodiments, the first shielding element 604 is a shield can.
The second shielding element 605 is disposed to cover the second coil element 603, that is, the upper core column of the core element 601, the second coil element 603, and the second shielding element 605 are sequentially arranged from inside to outside as viewed from the cross-section of the core element 601.
In some of these embodiments, the second shield element 605 is a shield can.
The lower insulating element 606 is disposed to cover the first shielding element 604, that is, viewed from a cutting plane of the core element 601, sequentially include the lower core column of the core element 601, the first coil element 602, the first shielding element 604, and the lower insulating element 606 from inside to outside.
In some of these embodiments, the lower insulating element 606 is a capacitive type insulation.
The upper insulating element 607 is disposed to cover the second shielding element 605, that is, the upper core column of the core element 601, the second coil element 603, the second shielding element 605, and the upper insulating element 607 are sequentially arranged from inside to outside as viewed from the cross-section of the core element 601.
In some of these embodiments, the upper insulating element 607 is a capacitive insulation.
Further, the body unit 600 further includes a first lead element and a second lead element. Wherein, the first lead element is disposed inside the lower insulating element 606 and is connected to the first coil element 602 and the base unit 100 respectively; the second lead element is provided inside the upper insulating element 607, and is connected to the second coil element 603 and the expansion unit 500, respectively.
Specifically, the first lead element is disposed inside the first shielding element 604; the second lead element is connected to a second shield element 605.
More specifically, the first lead element is connected with the low-voltage terminal; the second lead element is connected to the high voltage terminal.
In some of these embodiments, the first lead elements are the primary coil low voltage terminal and the secondary coil lead.
In some of these embodiments, the second lead element is a primary coil high voltage terminal lead.
Further, the body unit 600 further includes a first balance element and a second balance element. Wherein the first balance element is arranged between the core element 601 and the first coil element 602; the second balance element is disposed between the core element 601 and the second coil element 603, and is connected to the first balance element in a reverse direction, and a connection point of the first balance element and the second balance element is at the core element 601.
In some of these embodiments, the first balance element and the second balance element are balance windings for balancing the magnetic potential.
Example 2
The present embodiment relates to an electromagnetic voltage transformer device according to the present invention.
An exemplary embodiment of the present invention, as shown in fig. 2a to 2b, is an electromagnetic voltage transformer device for 550kV, including a base unit 100, a lower porcelain bushing unit 200, an oil storage unit 300, an upper porcelain bushing unit 400, an expansion unit 500, and a body unit 600. Wherein the base unit 100 is placed on a horizontal plane; the lower porcelain bushing unit 200 is disposed on the upper portion of the base unit 100 and connected to the base unit 100; the oil storage unit 300 is arranged at the upper part of the lower porcelain bushing unit 200 and is connected with the lower porcelain bushing unit 200; the upper porcelain bushing unit 400 is disposed at the upper portion of the oil storage unit 300 and connected to the oil storage unit 300; the expansion unit 500 is disposed at the upper portion of the upper porcelain bushing unit 400 and connected to the upper porcelain bushing unit 400; the body unit 600 is disposed inside the lower porcelain bushing unit 200, the oil storage unit 300, and the upper porcelain bushing unit 400, and is connected to the base unit 100, the oil storage unit 300, and the expansion unit 500, respectively.
In the invention, the electromagnetic voltage mutual inductor is of a single-phase cascade structure, and the inside of the electromagnetic voltage mutual inductor is insulated by oiled paper.
As shown in fig. 3, the base unit 100 includes a base member 101, a first fixing member 102, and a ground member. Wherein, the base element 101 is arranged on a horizontal plane and connected with the lower porcelain bushing unit 200; the first fixing member 102 is disposed at an upper portion of the base member 101 and connected to the body unit 600; the ground element is connected to the base element 101 for grounding.
Specifically, the base element 101 is connected with a first lead element; the first stationary member 102 is connected to the lower insulating member 606.
The base element 101 comprises a support platform and at least four support legs, which are arranged around the support platform.
In some of these embodiments, the support feet are angled outwardly.
In some of these embodiments, the support feet are bolted to a horizontal surface.
In some embodiments, the number of the first fixing elements 102 is several, and the several first fixing elements 102 are disposed around the central axis of the base element 101.
In some of these embodiments, the longitudinal cross-section of the first fixation element 102 is in the shape of an inverted L.
In some embodiments, the first fastening element 102 is detachably connected to the body unit 600, including but not limited to, snapping, screwing, etc.
In some of these embodiments, the first fixation element 102 is a fixation bracket.
In some of these embodiments, the grounding element is a ground plate.
Further, the base unit 100 also includes a valve element. The valve element is provided on the base element 101, and is used for discharging and supplying oil to the electromagnetic voltage transformer.
In some of these embodiments, the valve element is an oil drain valve.
As shown in fig. 4, the lower insulator unit 200 includes a lower insulator element 201, a first lower flange element 202, and a first upper flange element 203. Wherein, the lower porcelain sleeve element 201 is arranged on the upper part of the base unit 100; the first lower flange element 202 is disposed at the lower portion of the lower porcelain bushing element 201 and connected to the base unit 100; the first upper flange member 203 is disposed at a lower portion of the upper porcelain bushing member 401 and is connected to the oil storage unit 300.
Specifically, the lower porcelain sleeve element 201 is disposed on the upper portion of the base element 101, and is sleeved with the lower insulating element 606; the first lower flange element 202 is detachably connected to the base element 101.
The first lower flange element 202 is disposed outside the lower porcelain sleeve element 201, and an end surface thereof is located on the same horizontal plane as an end surface of the lower porcelain sleeve element 201.
In some of these embodiments, the first lower flange element 202 is adhesively connected with the lower porcelain sleeve element 201.
The first upper flange element 203 is disposed outside the lower porcelain bushing element 201, and an end surface of the first upper flange element is located on the same horizontal plane as an end surface of the lower porcelain bushing element 201.
In some of these embodiments, the first upper flange element 203 is adhesively connected to the lower porcelain sleeve element 201.
As shown in fig. 5, the oil storage unit 300 includes an oil storage member 301 and a second fixing member. Wherein, the oil storage element 301 is respectively connected with the lower porcelain bushing unit 200 and the upper porcelain bushing unit 400; the second fixing member is disposed inside the oil storage member 301 and connected to the body unit 600.
Specifically, the oil storage element 301 is arranged at the upper part of the lower porcelain sleeve element 201 and is detachably connected with the first upper flange element 203; an iron core element 601, a first coil element 602, a second coil element 603, a first shielding element 604 and a second shielding element 605 are arranged inside the oil storage element 301, wherein the first coil element 602 is arranged at the lower part inside the oil storage element 301; the second coil element 603 is provided at the upper part inside the oil reservoir element 301; the first shielding member 604 is provided at the lower portion of the inside of the oil storage member 301; the second shield member 605 is provided at an upper portion inside the oil reservoir member 301; the second fixing element is connected to the core element 601.
In some of these embodiments, reservoir element 301 is a fuel tank.
One end of the second fixing member is connected to the inner wall of the oil reservoir member 301, and the other end of the second fixing member is connected to the core member 601.
In some embodiments, the number of the second fixing elements is several, and the several second fixing elements are arranged around the central axis of the oil storage element 301.
In some of these embodiments, the second fixation element is a fixation bracket.
As shown in fig. 6, the upper insulator unit 400 includes an upper insulator element 401, a second lower flange element 402, and a second upper flange element 403. Wherein, the upper porcelain bushing element 401 is disposed at the upper portion of the oil storage unit 300; the second lower flange member 402 is disposed at the lower portion of the upper porcelain sleeve member 401, and is connected to the oil storage unit 300; a second upper flange member 403 is provided on the upper portion of the upper porcelain bushing member 401 and is connected to the expansion unit 500.
Specifically, the upper porcelain bushing element 401 is disposed on the upper portion of the oil storage element 301, and is sleeved with the upper insulating element 607; the second lower flange member 402 is detachably connected to the oil storage member 301.
The second lower flange element 402 is disposed outside the upper insulator element 401, and an end surface thereof is located at the same horizontal plane as an end surface of the upper insulator element 401.
In some of these embodiments, the second lower flange element 402 is adhesively attached to the upper insulator element 401.
The second upper flange element 403 is disposed outside the upper insulator element 401, and an end surface of the second upper flange element is located at the same horizontal plane as an end surface of the upper insulator element 401.
In some of these embodiments, the second upper flange element 403 is adhesively attached to the upper insulator element 401.
As shown in fig. 7a to 7b, the expansion unit 500 includes an expansion member 501, a primary terminal member 502, a third fixing member 503, a cover member 504, and a window member 505. Wherein, the expansion element 501 is arranged on the upper part of the upper porcelain bushing unit 400 and connected with the upper porcelain bushing unit 400; the primary terminal element 502 is connected to the expansion element 501 for connection to a high-voltage network; the third fixing member 503 is disposed at a lower portion of the expansion member 501, and is connected to the body unit 600; the cover element 504 is disposed around the expansion element 501; a window member 505 is provided to the hood member 504 for observing the oil level.
Specifically, the expansion element 501 is disposed at an upper portion of the upper porcelain sleeve element 401, and is detachably connected to the second upper flange element 403; the expansion element 501 is also connected to a second lead element; the third fixing member 503 is connected to the upper insulating member 607.
More specifically, the primary terminal element 502 is connected to the second lead element through the expansion element 501.
The expansion element 501 is made of a metal material, so that the volume change of the insulating oil in the product caused by the temperature change can be effectively adjusted, and the sealing performance of the product is ensured.
In some of these embodiments, the expansion element 501 is an expander.
One end of the primary terminal member 502 is connected to the expansion element 501, and the other end of the primary terminal member 502 is provided outside the cover member 504.
One end of the third fixing member 503 is connected to the lower portion of the expansion member 501, and the other end of the third fixing member 503 is connected to the body unit 600.
In some of these embodiments, the longitudinal cross-section of the third fixing element 503 is in the shape of an inverted L.
In some of these embodiments, the number of the third fixing elements 503 is several, and several third fixing elements 503 are disposed around the central axis of the expansion element 501.
In some of these embodiments, the third fixation element 503 is a fixation bracket.
In some of these embodiments, the cover element 504 is an expander cover.
In some of these embodiments, the window element 505 is an oil level viewing window.
Further, the electromagnetic voltage transformer device further includes a wiring unit 700. The wire connection unit 700 is disposed at a lower portion of the base unit 100 and connected to the base unit 100.
As shown in fig. 8a to 8b, the wiring unit 700 includes a wiring element 701, a connection box element 702, a secondary terminal element 703, and a secondary terminal box element 704. Wherein, the wiring element 701 is disposed at the lower part of the base unit 100 and connected with the base unit 100; the junction box element 702 is connected with the wiring element 701; the secondary terminal element 703 is provided at the outer end of the connection box element 702 and connected to the wiring element 701; secondary terminal block element 704 is connected to secondary terminal element 703.
Specifically, the wiring element 701 is connected with the first coil element 602; the junction box element 702 is disposed at the bottom of the base element 101 and is detachably connected to the base element 101.
More specifically, the wiring member 701 is connected with the first lead member.
One end of the junction box element 702 is connected to the center of the bottom of the base element 101, the other end of the junction box element 702 extends outside the base element 101 and is connected to the secondary terminal element 703, and the bottom of the junction box element 702 is connected to the wiring element 701.
Secondary terminal block element 704 is provided outside secondary terminal element 703, and is detachably connected to secondary terminal element 703.
In some of these embodiments, the junction box element 702 is a junction box.
In some of these embodiments, the wire connection element 701 is a wire connection block.
In some of these embodiments, secondary terminal element 703 is a secondary terminal resin block.
In some of these embodiments, secondary junction box element 704 is a secondary junction box.
Further, the wiring connection unit 700 further includes a compensation element. The compensation element is disposed inside the junction box element 702.
In some of these embodiments, the compensation element is a compensation coil.
Further, the electromagnetic voltage transformer device further comprises a fastening unit. The fastening unit is provided at a connection position between the base unit 100, the lower porcelain bushing unit 200, the oil storage member 301, the upper porcelain bushing unit 400, the expansion unit 500, and the body unit 600.
The fastening unit comprises a number of fastening elements. The fastening elements are respectively arranged at the connecting positions of the base unit 100, the lower porcelain bushing unit 200, the oil storage element 301, the upper porcelain bushing unit 400, the expansion unit 500 and the body unit 600.
In particular, several fastening elements are provided at the connection of the base element 101 and the first lower flange element 202; a plurality of fastening elements are arranged at the connection part of the base element 101 and the connection box element 702; a plurality of fastening elements are arranged at the connecting part of the first upper flange element 203 and the oil storage element 301; a plurality of fastening elements are arranged at the connecting part of the oil storage element 301 and the second lower flange element 402; fastening elements are provided at the connection of the second upper flange element 403 and the expansion element 501.
In some of these embodiments, the fastening elements include, but are not limited to, fastening bolts, fastening nuts, self-locking nuts, washers, and the like.
Example 3
An embodiment of the present invention.
A550 kV electromagnetic type voltage transformer comprises an expander, an upper porcelain bushing, a lower porcelain bushing, a transformer body, an oil tank, a base, a wiring board, a connecting box, a secondary terminal resin block and a secondary junction box. The expander is fixed on the upper portion of the upper porcelain sleeve, the lower portion of the upper porcelain sleeve is installed on the oil tank, the lower portion of the oil tank is connected with the upper portion of the lower porcelain sleeve, the lower portion of the lower porcelain sleeve is installed on the base, the connecting box is fixed below the base, the wiring board is installed at the bottom of the connecting box, the secondary terminal resin block is installed at the other end of the connecting box, and the secondary terminal box is connected with the secondary terminal resin block. In addition, all joints are locked by self-locking nuts.
The expander at the top of the 550kV electromagnetic voltage transformer compensates the change of the volume of the transformer oil caused by different temperatures, and the sealing performance of the product is ensured. The expander is externally provided with an expander cover. And an oil level observation window is arranged on the expander cover and used for observing the oil level state. And a primary terminal is arranged on the expander and is connected with a high-voltage power grid.
The transformer body comprises an iron core, an upper coil, a lower coil, an upper shielding cover, a lower shielding cover, an upper capacitor type insulator and a lower capacitor type insulator. The iron core, the upper coil and the lower coil are fixedly arranged inside the oil tank; the upper coil is sleeved on an upper core column of the iron core; the lower coil is sleeved on a lower core column of the iron core; the upper shielding cover is sleeved with an upper coil; the lower shielding cover is sleeved with a lower coil; the upper capacitor type insulation is arranged in the upper porcelain sleeve and sleeved with the upper shielding cover; the lower capacitor type insulation is arranged in the lower porcelain bushing and sleeved with the lower shielding cover.
The upper coil includes a last primary coil. Wherein, last primary coil cover establishes the last post setting of iron core, and last primary coil is connected with the expander through going up the lead wire to be connected with primary terminal. Wherein the upper lead is connected to the upper shield case and connected to the high voltage terminal.
The lower coil includes a next primary coil and a secondary coil. The secondary coil is connected with the wiring board through a lower lead wire, then connected to the secondary terminal resin block to be led out, and connected with an external connecting wire through a secondary junction box. The lower lead is positioned in a lower lead tube of the lower shielding case and is connected with the low-voltage terminal.
The lower shield is connected to ground, i.e. grounded.
Since the core is disposed in the middle, the core has an intermediate voltage between the high voltage and ground.
In addition, the transformer body also comprises two balance windings which are positioned between the iron core and the upper coil and the lower coil and are reversely connected with each other, and the connection point is arranged on the iron core and used for balancing magnetic potential.
The base is also provided with a grounding plate for grounding use.
Still be equipped with the fuel outlet valve on the base, the accessible fuel outlet valve is got oil appearance or is mended oil to the product.
The invention has the following advantages:
1. the defects of unstable error performance, poor transient performance and small output capacity caused by the influence of the environmental temperature and the power grid frequency on the capacitor of the capacitor voltage transformer are overcome;
2. the electromagnetic voltage transformer is realized by two capacitive insulation from high voltage to intermediate voltage (an iron core and an oil tank) and from the intermediate voltage to the ground, and the optimal electric field distribution is obtained along the two insulation, so that the whole transformer is capacitive, resonance of the electromagnetic voltage transformer with a circuit breaker fracture capacitor, a line-to-ground distribution capacitor and the like is effectively avoided, and the safe operation of a power grid is ensured;
3. the simple body structure is adopted, the diameter of the porcelain bushing is reduced, and the oil weight and the total weight are reduced; the capacitive main insulation enables the product to have good electrical strength and insulation performance and low dielectric loss factor;
4. self-locking nuts are used at all sealing joints, so that the complete sealing performance of the product is ensured.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. A kind of body unit, suitable for 550kV, apply to the mutual inductance device of electromagnetic voltage, characterized by that, comprising:
iron core element
A first coil element sleeved on a lower portion of the core element;
a second coil element, the second coil element being fitted over an upper portion of the core element;
the first shielding element is sleeved on the first coil element and is grounded;
the second shielding element is sleeved on the second coil element;
the lower insulating element is sleeved with the first shielding element and the first coil element;
and the upper insulating element is sleeved on the second shielding element and the second coil element.
2. The body unit of claim 1, further comprising:
a first lead element provided inside the lower insulating element and connected to the first coil element and the low-voltage terminal, respectively;
a second lead element provided inside the upper insulating element and connected to the second coil element and the high-voltage terminal, respectively; and/or
A first balance element disposed between the core element and the first coil element;
a second balance element disposed between the core element and the second coil element and connected in reverse to the first balance element, wherein a connection point of the first balance element and the second balance element is at the core element.
3. An electromagnetic voltage transformer device suitable for 550kV, comprising:
a base unit placed on a horizontal plane;
the lower porcelain bushing unit is arranged at the upper part of the base unit and is connected with the base unit;
the oil storage unit is arranged at the upper part of the lower porcelain sleeve unit and is connected with the lower porcelain sleeve unit;
the upper porcelain bushing unit is arranged at the upper part of the oil storage unit and is connected with the oil storage unit;
the expansion unit is arranged at the upper part of the upper porcelain bushing unit and is connected with the upper porcelain bushing unit;
the body unit according to claim 1 or 2, which is disposed inside the lower porcelain bushing unit, the oil storage unit, and the upper porcelain bushing unit, and is connected to the base unit, the oil storage unit, and the expansion unit, respectively.
4. The electromagnetic voltage transformer apparatus of claim 3, wherein the base unit comprises:
the base element is arranged on the horizontal plane and is connected with the lower porcelain bushing unit;
a first fixing member provided at an upper portion of the base member and connected with the body unit;
a grounding element connected to the base element for grounding; and/or
The oil storage unit includes:
the oil storage element is respectively connected with the lower porcelain bushing unit and the upper porcelain bushing unit;
a second fixing member disposed inside the oil storage member and connected to the body unit; and/or
The expansion unit includes:
the expansion element is arranged at the upper part of the upper porcelain sleeve unit and is connected with the upper porcelain sleeve unit;
a primary terminal element connected with the expansion element for connection with a high voltage network;
a third fixing member provided at a lower portion of the expansion member and connected to the body unit;
a cover element disposed about the expansion element;
a window element disposed to the cover element for observing an oil level.
5. The electromagnetic voltage transformer apparatus of claim 4, wherein the base unit further comprises:
and the valve element is arranged on the base element and used for discharging and supplementing oil to the electromagnetic voltage mutual inductance device.
6. The electromagnetic voltage transformer according to claim 3, wherein said lower porcelain bushing unit comprises:
a lower porcelain bushing element disposed at an upper portion of the base unit;
a first lower flange element disposed at a lower portion of the lower porcelain bushing element and connected with the base unit;
a first upper flange element disposed at a lower portion of the upper porcelain bushing element and connected to the oil storage unit; and/or
The upper porcelain bushing unit comprises:
an upper porcelain bushing element disposed at an upper portion of the oil storage unit;
the second lower flange element is arranged at the lower part of the upper porcelain sleeve element and is connected with the oil storage unit;
a second upper flange element disposed at an upper portion of the upper porcelain bushing element and connected with the expansion unit.
7. The electromagnetic voltage transformer according to any one of claims 3 to 6, further comprising:
the wiring unit is arranged at the lower part of the base unit and is connected with the base unit; and/or
And the fastening unit is arranged at the connecting positions among the base unit, the lower porcelain bushing unit, the oil storage unit, the upper porcelain bushing unit, the expansion unit and the body unit.
8. The electromagnetic voltage transformer apparatus of claim 7, wherein the wiring connection unit comprises:
a connection box element provided at a lower portion of the base unit and connected with the base unit;
a junction element connected with the junction box element;
a secondary terminal element provided at an outer end of the connection box element and connected with the connection box element;
a secondary terminal block element connected with the connection block element.
9. The electromagnetic voltage transformer according to claim 8, wherein said wiring unit further comprises:
a compensation element disposed inside the connection box element.
10. The electromagnetic voltage transformer apparatus of claim 7, wherein the fastening unit comprises:
and the fastening elements are respectively arranged at the connecting positions among the base unit, the lower porcelain bushing unit, the oil storage unit, the upper porcelain bushing unit, the expansion unit and the body unit.
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| CN202210718850.XA CN115036115B (en) | 2022-06-23 | 2022-06-23 | A device body unit and an electromagnetic voltage transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115410807A (en) * | 2022-09-16 | 2022-11-29 | 江苏思源赫兹互感器有限公司 | 550kv cascade electromagnetic voltage transformer |
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| CN115036115B (en) | 2025-12-02 |
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