A device body unit and an electromagnetic voltage transformer

Abstract

This invention relates to a transformer body unit and an electromagnetic voltage transformer device. The transformer body unit includes an iron core element, a first coil element and a second coil element respectively housed on the lower and upper parts of the iron core element, a first shielding element and a second shielding element respectively housed on the first coil element and the second coil element, and a lower insulating element and an upper insulating element respectively housed on the first shielding element and the second shielding element. Its advantages are: by utilizing the upper and lower insulating elements, optimal electric field distribution is obtained, making the transformer device capacitive, effectively avoiding resonance between the electromagnetic voltage transformer device and circuit breaker capacitance, line-to-ground distributed capacitance, etc., ensuring the safe operation of the power grid; by using the transformer body unit, the diameter of the porcelain bushing unit can be reduced, reducing oil weight and overall weight; the upper and lower insulating elements give the product good electrical strength and insulation performance as well as a low dielectric loss factor; overcoming the disadvantages of unstable performance, poor transient performance, and small output capacity.

Description

Technical Field

[0001] This invention relates to the field of high voltage measurement and relay protection equipment technology, and in particular to a transformer unit and an electromagnetic voltage transformer device. Background Technology

[0002] Voltage transformers are an indispensable piece of equipment in power plants, substations, and other power transmission and supply systems. Similar to transformers, voltage transformers are used to transform voltage. Power systems require voltage transformers to collect voltage signals from the primary circuit, providing them for electrical measurement, energy metering, relay protection, and automatic devices.

[0003] Traditional electromagnetic voltage transformers are characterized by their large weight and size. With the development of ultra-high voltage (UHV) power grids, the requirements for their insulation strength are becoming increasingly stringent, making UHV electromagnetic voltage transformers expensive and difficult to manufacture. Currently, electromagnetic voltage transformers are used in power systems of 220 kV and below, and cannot be used in UHV power systems. Furthermore, because electromagnetic voltage transformers are inductive, they are prone to ferroresonance between the transformer and the line capacitance, which can lead to transformer damage.

[0004] The 550kV voltage transformers used in ultra-high voltage measurement and relay protection equipment are capacitive voltage transformers, but they are easily affected by factors such as ambient temperature and power grid frequency, resulting in unstable error performance; and the transient performance and output capacity are poor due to the influence of internal components.

[0005] Currently, no effective solutions have been proposed for the problems existing in related technologies, such as electromagnetic voltage transformers being unsuitable for ultra-high voltage power systems, being prone to ferroresonance, being large in size, having high manufacturing costs, and being easily damaged. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a transformer body unit and an electromagnetic voltage transformer device, thereby solving problems such as the inability of electromagnetic voltage transformers to be applied to ultra-high voltage power systems, susceptibility to ferroresonance, large size, high manufacturing cost, and easy damage.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] Firstly, a transformer body unit suitable for 550kV is provided for use in electromagnetic voltage transformers, including:

[0009] Iron core components

[0010] The first coil element is sleeved on the lower part of the iron core element;

[0011] The second coil element is sleeved on the upper part of the iron core element;

[0012] A first shielding element is disposed around the first coil element, and the first shielding element is grounded;

[0013] The second shielding element is sleeved on the second coil element;

[0014] A lower insulating element, wherein the first shielding element and the first coil element are sleeved on the lower insulating element;

[0015] An upper insulating element is provided, on which the second shielding element and the second coil element are sleeved.

[0016] In some of these embodiments, it also includes:

[0017] The first lead element is disposed inside the lower insulating element and is connected to the first coil element and the low-voltage terminal respectively;

[0018] The second lead element is disposed inside the upper insulating element and is connected to the second coil element and the high voltage terminal, respectively.

[0019] In some of these embodiments, it also includes:

[0020] A first balancing element is disposed between the iron core element and the first coil element;

[0021] The second balancing element is disposed between the iron core element and the second coil element, and is connected in the opposite direction to the first balancing element. The connection point between the first balancing element and the second balancing element is on the iron core element.

[0022] Secondly, an electromagnetic voltage transformer device suitable for 550kV is provided, comprising:

[0023] A base unit, wherein the base unit is placed on a horizontal plane;

[0024] The lower ceramic sleeve unit is disposed on the upper part of the base unit and connected to the base unit;

[0025] An oil storage unit is disposed on the upper part of the lower ceramic sleeve unit and connected to the lower ceramic sleeve unit;

[0026] An upper ceramic sleeve unit is disposed on the upper part of the oil storage unit and connected to the oil storage unit;

[0027] An expansion unit is disposed on the upper part of the upper ceramic sleeve unit and connected to the upper ceramic sleeve unit;

[0028] As described in the first aspect, the body unit is disposed inside the lower ceramic sleeve unit, the oil storage unit, and the upper ceramic sleeve unit, and is respectively connected to the base unit, the oil storage unit, and the expansion unit.

[0029] In some embodiments, the base unit includes:

[0030] A base element, which is disposed on a horizontal plane and connected to the lower ceramic sleeve unit;

[0031] A first fixing element is disposed on the upper part of the base element and connected to the body unit;

[0032] A grounding element, which is connected to the base element, is used for grounding.

[0033] In some embodiments, the base unit further includes:

[0034] A valve element, which is disposed on the base element, is used to drain or replenish oil in the electromagnetic voltage transformer.

[0035] In some embodiments, the lower ceramic sleeve unit includes:

[0036] The lower ceramic sleeve element is disposed on the upper part of the base unit;

[0037] The first lower flange element is disposed at the lower part of the lower ceramic sleeve element and is connected to the base unit;

[0038] The first upper flange element is disposed at the lower part of the upper ceramic sleeve element and is connected to the oil storage unit.

[0039] In some embodiments, the oil storage unit includes:

[0040] An oil storage element is connected to the lower ceramic sleeve unit and the upper ceramic sleeve unit respectively;

[0041] The second fixing element is disposed inside the oil storage element and connected to the body unit.

[0042] In some embodiments, the upper ceramic sleeve unit includes:

[0043] An upper ceramic sleeve element is disposed at the upper part of the oil storage unit;

[0044] The second lower flange element is disposed at the lower part of the upper ceramic sleeve element and is connected to the oil storage unit;

[0045] The second upper flange element is disposed on the upper part of the upper ceramic sleeve element and is connected to the expansion unit.

[0046] In some embodiments, the expansion unit includes:

[0047] An expansion element is disposed on the upper part of the upper ceramic sleeve unit and connected to the upper ceramic sleeve unit;

[0048] A primary terminal element, which is connected to the expansion element, is used for connection to a high-voltage power grid;

[0049] The third fixing element is disposed at the lower part of the expansion element and is connected to the body unit;

[0050] A cover element, wherein the expansion element is fitted over the cover element;

[0051] A window element is disposed on the cover element for observing the oil level.

[0052] In some of these embodiments, it also includes:

[0053] A wiring unit is disposed at the lower part of the base unit and connected to the base unit.

[0054] In some embodiments, the wiring unit includes:

[0055] A connecting box element is disposed at the lower part of the base unit and connected to the base unit;

[0056] A wiring element, which is connected to the connection box element;

[0057] A secondary terminal element is disposed at the outer end of the connecting box element and connected to the connecting box element;

[0058] A secondary junction box element, wherein the junction box element is connected to the secondary terminal element.

[0059] In some embodiments, the wiring unit further includes:

[0060] A compensation element is disposed inside the connecting box element.

[0061] In some of these embodiments, it also includes:

[0062] A fastening unit is provided at the connection position between the base unit, the lower ceramic sleeve unit, the oil storage unit, the upper ceramic sleeve unit, the expansion unit, and the body unit.

[0063] In some embodiments, the fastening unit includes:

[0064] A plurality of fastening elements are respectively disposed at the connection positions between the base unit, the lower ceramic sleeve unit, the oil storage unit, the upper ceramic sleeve unit, the expansion unit, and the body unit.

[0065] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0066] This invention discloses a transformer body unit and an electromagnetic voltage transformer device. By utilizing upper and lower insulating elements, an optimal electric field distribution is achieved, making the transformer device capacitive. This effectively avoids resonance between the electromagnetic voltage transformer device and circuit breaker capacitance, line-to-ground distributed capacitance, etc., ensuring the safe operation of the power grid. The transformer body unit reduces the diameter of the porcelain bushing unit, decreasing oil weight and overall weight. The upper and lower insulating elements give the product excellent electrical strength and insulation performance, as well as a low dielectric loss factor. It overcomes the shortcomings of capacitive voltage transformers, such as unstable error performance, poor transient performance, and small output capacity due to the influence of ambient temperature and power grid frequency. Attached Figure Description

[0067] Figure 1 This is a schematic diagram of the body unit according to an embodiment of the present invention;

[0068] Figures 2a-2b This is a schematic diagram of an electromagnetic voltage transformer according to an embodiment of the present invention;

[0069] Figure 3 This is a schematic diagram of a base unit according to an embodiment of the present invention;

[0070] Figure 4 This is a schematic diagram of the lower ceramic sleeve unit according to an embodiment of the present invention;

[0071] Figure 5 This is a schematic diagram of an oil storage unit according to an embodiment of the present invention;

[0072] Figure 6 This is a schematic diagram of the upper ceramic sleeve unit according to an embodiment of the present invention;

[0073] Figures 7a-7b This is a schematic diagram of an expansion unit according to an embodiment of the present invention;

[0074] Figures 8a-8b This is a schematic diagram of a wiring unit according to an embodiment of the present invention.

[0075] The reference numerals in the accompanying drawings are: 100, base unit; 101, base element; 102, first fixing element;

[0076] 200. Lower porcelain bushing unit; 201. Lower porcelain bushing element; 202. First lower flange element; 203. First upper flange element;

[0077] 300. Oil storage unit; 301. Oil storage element;

[0078] 400. Upper porcelain bushing unit; 401. Upper porcelain bushing element; 402. Second lower flange element; 403. Second upper flange element;

[0079] 500. Expansion unit; 501. Expansion element; 502. Primary terminal element; 503. Third fixing element; 504. Cover element; 505. Window element;

[0080] 600. Body unit; 601. Core element; 602. First coil element; 603. Second coil element; 604. First shielding element; 605. Second shielding element; 606. Lower insulating element; 607. Upper insulating element;

[0081] 700. Wiring unit; 701. Wiring element; 702. Connector box element; 703. Secondary terminal element; 704. Secondary junction box element. Detailed Implementation

[0082] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0083] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0084] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0085] Example 1

[0086] This embodiment relates to the body unit of the present invention.

[0087] An illustrative embodiment of the present invention, such as Figure 1As shown, a transformer body unit 600, suitable for 550kV, is applied to an electromagnetic voltage transformer device, including 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. The first coil element 602 is fitted over the lower part of the core element 601; the second coil element 603 is fitted over the upper part of the core element 601; the first shielding element 604 is fitted over the first coil element 602 and is grounded; the second shielding element 605 is fitted over the second coil element 603; the lower insulating element 606 is fitted over the first shielding element 604 and the first coil element 602; and the upper insulating element 607 is fitted over the second shielding element 605 and the second coil element 603.

[0088] The core element 601 is a rectangular core, comprising a lower core post and an upper core post. The first coil element 602 is fitted onto the lower core post, and the second coil element 603 is fitted onto the upper core post. The rated voltage is distributed between the first coil element 602 and the second coil element 603.

[0089] The first coil element 602 includes a primary coil and a secondary coil. The primary coil is fitted onto the lower core post, and the secondary coil is fitted onto the primary coil and located inside the first shielding element 604, passing through the first shielding element 604.

[0090] The second coil element 603 includes a primary coil. The primary coil is sleeved on the upper core post and is located inside the second shielding element 605, and passes through the second shielding element 605.

[0091] The first shielding element 604 is set up with the first coil element 602. That is, when viewed from the cross-section of the iron core element 601, from the inside to the outside, the elements are the lower core column of the iron core element 601, the first coil element 602, and the first shielding element 604.

[0092] The first shielding element 604 is grounded.

[0093] In some of these embodiments, the first shielding element 604 is a shielding cover.

[0094] The second shielding element 605 is set up with the second coil element 603. That is, when viewed from the cross-section of the iron core element 601, from the inside to the outside, the elements are the upper core column of the iron core element 601, the second coil element 603, and the second shielding element 605.

[0095] In some of these embodiments, the second shielding element 605 is a shielding cover.

[0096] The lower insulating element 606 is fitted with the first shielding element 604. That is, when viewed from the cross-section of the iron core element 601, from the inside to the outside, the components are the lower core column of the iron core element 601, the first coil element 602, the first shielding element 604, and the lower insulating element 606.

[0097] In some of these embodiments, the lower insulating element 606 is capacitive insulation.

[0098] The upper insulating element 607 is fitted with the second shielding element 605. That is, when viewed from the cross-section of the iron core element 601, from the inside to the outside, the components are the upper core column of the iron core element 601, the second coil element 603, the second shielding element 605, and the upper insulating element 607.

[0099] In some of these embodiments, the upper insulating element 607 is capacitive insulation.

[0100] Furthermore, the body unit 600 also includes a first lead element and a second lead element. 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 disposed inside the upper insulating element 607 and is connected to the second coil element 603 and the expansion unit 500, respectively.

[0101] Specifically, the first lead element is disposed inside the first shielding element 604; the second lead element is connected to the second shielding element 605.

[0102] More specifically, the first lead element is connected to the low-voltage terminal; the second lead element is connected to the high-voltage terminal.

[0103] In some of these embodiments, the first lead element is the low-voltage end of the primary coil and the lead of the secondary coil.

[0104] In some of these embodiments, the second lead element is the high-voltage end lead of the primary coil.

[0105] Furthermore, the body unit 600 also includes a first balancing element and a second balancing element. The first balancing element is disposed between the core element 601 and the first coil element 602; the second balancing element is disposed between the core element 601 and the second coil element 603, and is connected in reverse to the first balancing element, and the connection point between the first balancing element and the second balancing element is at the core element 601.

[0106] In some embodiments, the first balancing element and the second balancing element are balancing windings used to balance the magnetomotive force.

[0107] Example 2

[0108] This embodiment relates to the electromagnetic voltage transformer of the present invention.

[0109] An illustrative embodiment of the present invention, such as Figures 2a-2b As shown, an electromagnetic voltage transformer device suitable for 550kV includes 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 transformer body unit 600. The base unit 100 is placed on a horizontal plane; the lower porcelain bushing unit 200 is located above and connected to the base unit 100; the oil storage unit 300 is located above and connected to the lower porcelain bushing unit 200; the upper porcelain bushing unit 400 is located above and connected to the oil storage unit 300; the expansion unit 500 is located above and connected to the upper porcelain bushing unit 400; and the transformer body unit 600 is located 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.

[0110] In this invention, the electromagnetic voltage transformer is a single-phase, cascade structure with internal oil-paper insulation.

[0111] like Figure 3 As shown, the base unit 100 includes a base element 101, a first fixing element 102, and a grounding element. The base element 101 is disposed on a horizontal plane and connected to the lower ceramic sleeve unit 200; the first fixing element 102 is disposed on the upper part of the base element 101 and connected to the body unit 600; the grounding element is connected to the base element 101 and is used for grounding.

[0112] Specifically, the base element 101 is connected to the first lead element; the first fixing element 102 is connected to the lower insulating element 606.

[0113] The base element 101 includes a support platform and at least four support legs, with the support legs arranged around the support platform.

[0114] In some of these embodiments, the support feet are angled outwards.

[0115] In some of these embodiments, the support legs are fixed to the horizontal plane by bolts.

[0116] In some embodiments, there are multiple first fixing elements 102, which are arranged around the central axis of the base element 101.

[0117] In some of these embodiments, the longitudinal section of the first fixing element 102 is inverted L-shaped.

[0118] In some of these embodiments, the first fixing element 102 is detachably connected to the body unit 600, including but not limited to snap-fit, threaded connection, etc.

[0119] In some of these embodiments, the first fixing element 102 is a fixing bracket.

[0120] In some of these embodiments, the grounding element is a ground plane.

[0121] Furthermore, the base unit 100 also includes a valve element. The valve element is disposed on the base unit 101 and is used to drain or replenish oil in the electromagnetic voltage transformer.

[0122] In some of these embodiments, the valve element is a drain valve.

[0123] like Figure 4 As shown, the lower ceramic sleeve unit 200 includes a lower ceramic sleeve element 201, a first lower flange element 202, and a first upper flange element 203. The lower ceramic sleeve element 201 is disposed on the upper part of the base unit 100; the first lower flange element 202 is disposed on the lower part of the lower ceramic sleeve element 201 and connected to the base unit 100; the first upper flange element 203 is disposed on the lower part of the upper ceramic sleeve element 401 and connected to the oil storage unit 300.

[0124] Specifically, the lower ceramic sleeve element 201 is disposed on the upper part of the base element 101 and is fitted with the lower insulating element 606; the first lower flange element 202 is detachably connected to the base element 101.

[0125] The first lower flange element 202 is sleeved on the outside of the lower ceramic sleeve element 201, and its end face is on the same horizontal plane as the end face of the lower ceramic sleeve element 201.

[0126] In some of these embodiments, the first lower flange element 202 is bonded to the lower ceramic sleeve element 201.

[0127] The first upper flange element 203 is fitted onto the outside of the lower ceramic sleeve element 201, and its end face is on the same horizontal plane as the end face of the lower ceramic sleeve element 201.

[0128] In some of these embodiments, the first upper flange element 203 is bonded to the lower ceramic sleeve element 201.

[0129] like Figure 5 As shown, the oil storage unit 300 includes an oil storage element 301 and a second fixing element. The oil storage element 301 is connected to the lower ceramic sleeve unit 200 and the upper ceramic sleeve unit 400, respectively; the second fixing element is disposed inside the oil storage element 301 and is connected to the body unit 600.

[0130] Specifically, the oil storage element 301 is disposed on the upper part of the lower ceramic sleeve element 201 and is detachably connected to the first upper flange element 203; the oil storage element 301 is internally provided with 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, wherein the first coil element 602 is disposed in the lower part of the interior of the oil storage element 301; the second coil element 603 is disposed in the upper part of the interior of the oil storage element 301; the first shielding element 604 is disposed in the lower part of the interior of the oil storage element 301; the second shielding element 605 is disposed in the upper part of the interior of the oil storage element 301; and the second fixing element is connected to the iron core element 601.

[0131] In some of these embodiments, the oil storage element 301 is an oil tank.

[0132] One end of the second fixing element is connected to the inner wall of the oil storage element 301, and the other end of the second fixing element is connected to the iron core element 601.

[0133] In some embodiments, there are several second fixing elements, which are arranged around the central axis of the oil storage element 301.

[0134] In some of these embodiments, the second fixing element is a fixing bracket.

[0135] like Figure 6 As shown, the upper ceramic sleeve unit 400 includes an upper ceramic sleeve element 401, a second lower flange element 402, and a second upper flange element 403. The upper ceramic sleeve element 401 is disposed at the upper part of the oil storage unit 300; the second lower flange element 402 is disposed at the lower part of the upper ceramic sleeve element 401 and connected to the oil storage unit 300; the second upper flange element 403 is disposed at the upper part of the upper ceramic sleeve element 401 and connected to the expansion unit 500.

[0136] Specifically, the upper ceramic sleeve element 401 is disposed on the upper part of the oil storage element 301 and is fitted with an upper insulating element 607; the second lower flange element 402 is detachably connected to the oil storage element 301.

[0137] The second lower flange element 402 is sleeved on the outside of the upper ceramic sleeve element 401, and its end face is on the same horizontal plane as the end face of the upper ceramic sleeve element 401.

[0138] In some of these embodiments, the second lower flange element 402 is bonded to the upper ceramic sleeve element 401.

[0139] The second upper flange element 403 is fitted onto the outside of the upper ceramic sleeve element 401, and its end face is on the same horizontal plane as the end face of the upper ceramic sleeve element 401.

[0140] In some of these embodiments, the second upper flange element 403 is bonded to the upper ceramic sleeve element 401.

[0141] like Figures 7a-7b As shown, the expansion unit 500 includes an expansion element 501, a primary terminal element 502, a third fixing element 503, a cover element 504, and a window element 505. The expansion element 501 is located on the upper part of the upper ceramic sleeve unit 400 and connected to it; the primary terminal element 502 is connected to the expansion element 501 for connection to a high-voltage power grid; the third fixing element 503 is located on the lower part of the expansion element 501 and connected to the body unit 600; the cover element 504 is fitted over the expansion element 501; and the window element 505 is located on the cover element 504 for observing the oil level.

[0142] Specifically, the expansion element 501 is disposed on the upper part of the upper ceramic sleeve element 401 and is detachably connected to the second upper flange element 403; the expansion element 501 is also connected to the second lead element; the third fixing element 503 is connected to the upper insulating element 607.

[0143] More specifically, the primary terminal element 502 is connected to the second lead element via the expansion element 501.

[0144] The expansion element 501 is made of metal and can effectively regulate the volume change of the insulating oil inside the product caused by temperature changes, thus ensuring the product's sealing performance.

[0145] In some of these embodiments, the expansion element 501 is an expander.

[0146] One end of the primary terminal element 502 is connected to the expansion element 501, and the other end of the primary terminal element 502 is disposed outside the cover element 504.

[0147] One end of the third fixing element 503 is connected to the lower part of the expansion element 501, and the other end of the third fixing element 503 is connected to the body unit 600.

[0148] In some of these embodiments, the longitudinal section of the third fixing element 503 is inverted L-shaped.

[0149] In some embodiments, there are multiple third fixing elements 503, which are arranged around the central axis of the expansion element 501.

[0150] In some of these embodiments, the third fixing element 503 is a fixing bracket.

[0151] In some of these embodiments, the cover element 504 is an expansion tank cover.

[0152] In some of these embodiments, window element 505 is an oil level observation window.

[0153] Furthermore, the electromagnetic voltage transformer also includes a wiring unit 700. The wiring unit 700 is disposed at the lower part of the base unit 100 and connected to the base unit 100.

[0154] like Figures 8a-8b As shown, the wiring unit 700 includes a wiring element 701, a connection box element 702, a secondary terminal element 703, and a secondary junction box element 704. The wiring element 701 is located at the lower part of the base unit 100 and connected to it; the connection box element 702 is connected to the wiring element 701; the secondary terminal element 703 is located at the outer end of the connection box element 702 and connected to the wiring element 701; and the secondary junction box element 704 is connected to the secondary terminal element 703.

[0155] Specifically, the wiring element 701 is connected to the first coil element 602; the connecting box element 702 is disposed at the bottom of the base element 101 and is detachably connected to the base element 101.

[0156] More specifically, wiring element 701 is connected to the first lead element.

[0157] One end of the connecting box element 702 is connected to the center of the bottom of the base element 101, the other end of the connecting box element 702 extends outward from the base element 101 and is connected to the secondary terminal element 703, and the bottom of the connecting box element 702 is connected to the wiring element 701.

[0158] The secondary junction box element 704 is disposed outside the secondary terminal element 703 and is detachably connected to the secondary terminal element 703.

[0159] In some of these embodiments, the connector element 702 is a connector box.

[0160] In some of these embodiments, the wiring element 701 is a wiring board.

[0161] In some of these embodiments, the secondary terminal element 703 is a secondary terminal resin block.

[0162] In some of these embodiments, the secondary junction box element 704 is a secondary junction box.

[0163] Furthermore, the wiring unit 700 also includes a compensation element. The compensation element is disposed inside the connector element 702.

[0164] In some of these embodiments, the compensation element is a compensation coil.

[0165] Furthermore, the electromagnetic voltage transformer also includes a fastening unit. The fastening unit is located at the connection points between 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.

[0166] The fastening unit includes several fastening elements. These fastening elements are respectively disposed at the connection positions between the base unit 100, the lower ceramic sleeve unit 200, the oil storage element 301, the upper ceramic sleeve unit 400, the expansion unit 500, and the body unit 600.

[0167] Specifically, several fastening elements are provided at the connection between the base element 101 and the first lower flange element 202; several fastening elements are provided at the connection between the base element 101 and the connecting box element 702; several fastening elements are provided at the connection between the first upper flange element 203 and the oil storage element 301; several fastening elements are provided at the connection between the oil storage element 301 and the second lower flange element 402; and several fastening elements are provided at the connection between the second upper flange element 403 and the expansion element 501.

[0168] In some embodiments, the fastening elements include, but are not limited to, fastening bolts, fastening nuts, self-locking nuts, washers, etc.

[0169] Example 3

[0170] A specific embodiment of the present invention.

[0171] A 550kV electromagnetic voltage transformer includes an expansion joint, an upper porcelain bushing, a lower porcelain bushing, a transformer body, an oil tank, a base, a terminal block, a junction box, a secondary terminal resin block, and a secondary junction box. The expansion joint is fixed to the upper part of the upper porcelain bushing. The lower part of the upper porcelain bushing is mounted on top of the oil tank, and the lower part of the oil tank connects to the upper part of the lower porcelain bushing. The lower part of the lower porcelain bushing is mounted on top of the base. The junction box is fixed to the lower part of the base, the terminal block is mounted at the bottom of the junction box, and the secondary terminal resin block is mounted at the other end of the junction box. The secondary junction box is connected to the secondary terminal resin block. Furthermore, all connections are secured with self-locking nuts.

[0172] The expansion tank on top of the 550kV electromagnetic voltage transformer compensates for changes in transformer oil volume due to temperature variations, ensuring product sealing. An expansion tank cover is installed externally. The expansion tank cover has an oil level observation window for monitoring the oil level. Primary terminals are installed on the expansion tank for connection to the high-voltage power grid.

[0173] The transformer body includes an iron core, an upper coil, a lower coil, an upper shield, a lower shield, an upper capacitive insulation layer, and a lower capacitive insulation layer. The iron core, upper coil, and lower coil are fixedly installed inside the oil tank; the upper coil is fitted onto the upper core post of the iron core; the lower coil is fitted onto the lower core post of the iron core; the upper shield is fitted onto the upper coil; the lower shield is fitted onto the lower coil; the upper capacitive insulation layer is located inside the upper porcelain bushing and is fitted onto the upper shield; the lower capacitive insulation layer is located inside the lower porcelain bushing and is fitted onto the lower shield.

[0174] The upper coil includes the upper primary coil. The upper primary coil is fitted with the upper core post of the iron core and is connected to the expander via an upper lead wire, and also connected to the primary terminal. The upper lead wire is connected to the upper shield and then to the high-voltage terminal.

[0175] The lower coil includes a primary coil and a secondary coil. The primary coil is fitted with the lower core post of the iron core. The secondary coil is connected to the terminal block via a lower lead wire, then to the secondary terminal resin block for lead-out, and finally to an external connection wire via a secondary junction box. The lower lead wire is located inside the lower lead wire tube of the lower shield and is connected to the low-voltage terminal.

[0176] The lower shield is connected to the ground, i.e., grounded.

[0177] Because the iron core is located in the middle, it has an intermediate voltage between the high voltage and ground.

[0178] In addition, the device body also includes two balancing windings, located between the iron core and the upper and lower coils, and connected in opposite directions to each other. The connection point is on the iron core, which is used to balance the magnetomotive force.

[0179] The base is also equipped with a grounding plate for grounding.

[0180] The base is also equipped with an oil drain valve, which can be used to take oil samples or add oil to the product.

[0181] The advantages of this invention are as follows:

[0182] 1. It overcomes the shortcomings of capacitive voltage transformers, such as unstable error performance, poor transient performance, and small output capacity caused by the influence of ambient temperature and power grid frequency.

[0183] 2. The electromagnetic voltage transformer of the present invention achieves the transition from high voltage to intermediate voltage (iron core and oil tank) and from intermediate voltage to ground through two capacitive insulations. The optimal electric field distribution is obtained along the two insulations, making the entire transformer capacitive. This effectively avoids resonance between the electromagnetic voltage transformer and the circuit breaker break capacitance, the line-to-ground distributed capacitance, etc., ensuring the safe operation of the power grid.

[0184] 3. The simple body structure reduces the diameter of the porcelain bushing, thus reducing oil weight and overall weight; the capacitive main insulation gives the product good electrical strength and insulation performance, and a low dielectric loss factor.

[0185] 4. Self-locking nuts are used at all sealing connections to ensure the product's complete sealing performance.

[0186] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. An electromagnetic voltage transformer device suitable for 550kV, characterized in that, include: A base unit, wherein the base unit is placed on a horizontal plane; The lower ceramic sleeve unit is disposed on the upper part of the base unit and connected to the base unit; An oil storage unit is disposed on the upper part of the lower ceramic sleeve unit and connected to the lower ceramic sleeve unit; An upper ceramic sleeve unit is disposed on the upper part of the oil storage unit and connected to the oil storage unit; An expansion unit is disposed on the upper part of the upper ceramic sleeve unit and connected to the upper ceramic sleeve unit; The device body unit is disposed inside the lower ceramic sleeve unit, the oil storage unit and the upper ceramic sleeve unit, and is respectively connected to the base unit, the oil storage unit and the expansion unit; The body unit includes: Iron core element, the iron core element being disposed inside the oil storage unit; The first coil element is sleeved on the lower part of the iron core element and disposed inside the oil storage unit; The second coil element is sleeved on the upper part of the iron core element and disposed inside the oil storage unit; A first shielding element is provided, which is sleeved on the first coil element and grounded, and is located inside the oil storage unit; The second shielding element is sleeved over the second coil element and disposed inside the oil storage unit; The lower insulating element is sleeved on the first shielding element and the first coil element, and is respectively connected to the base unit and the expansion unit, and is sleeved on by the lower ceramic sleeve unit; An upper insulating element, wherein the second shielding element and the second coil element are sleeved on the upper insulating element, and the upper ceramic sleeve unit is also sleeved on the upper insulating element; The first lead element is disposed inside the lower insulating element and is connected to the first coil element, the low-voltage terminal, and the base unit respectively. The second lead element is disposed inside the upper insulating element and is connected to the second coil element, the high voltage terminal, and the expansion unit, respectively.

2. The electromagnetic voltage transformer device according to claim 1, characterized in that, The base unit includes: A base element, which is disposed on a horizontal plane and connected to the lower ceramic sleeve unit; A first fixing element is disposed on the upper part of the base element and connected to the body unit; A grounding element, connected to the base element, is used for grounding; and / or The oil storage unit includes: An oil storage element is connected to the lower ceramic sleeve unit and the upper ceramic sleeve unit respectively; A second fixing element is disposed inside the oil storage element and connected to the body unit; and / or The expansion unit includes: An expansion element is disposed on the upper part of the upper ceramic sleeve unit and connected to the upper ceramic sleeve unit; A primary terminal element, which is connected to the expansion element, is used for connection to a high-voltage power grid; The third fixing element is disposed at the lower part of the expansion element and is connected to the body unit; A cover element, wherein the expansion element is fitted over the cover element; A window element is disposed on the cover element for observing the oil level.

3. The electromagnetic voltage transformer device according to claim 2, characterized in that, The base unit also includes: A valve element, which is disposed on the base element, is used to drain or replenish oil in the electromagnetic voltage transformer.

4. The electromagnetic voltage transformer device according to claim 1, characterized in that, The lower ceramic sleeve unit includes: The lower ceramic sleeve element is disposed on the upper part of the base unit; The first lower flange element is disposed at the lower part of the lower ceramic sleeve element and is connected to the base unit; A first upper flange element is disposed on the upper part of the lower ceramic sleeve element and connected to the oil storage unit; and / or The upper ceramic sleeve unit includes: An upper ceramic sleeve element is disposed at the upper part of the oil storage unit; The second lower flange element is disposed at the lower part of the upper ceramic sleeve element and is connected to the oil storage unit; The second upper flange element is disposed on the upper part of the upper ceramic sleeve element and is connected to the expansion unit.

5. The electromagnetic voltage transformer device according to claim 1, characterized in that, The body unit also includes: A first balancing element is disposed between the iron core element and the first coil element; The second balancing element is disposed between the iron core element and the second coil element, and is connected in the opposite direction to the first balancing element. The connection point between the first balancing element and the second balancing element is on the iron core element.

6. The electromagnetic voltage transformer according to any one of claims 1 to 5, characterized in that, Also includes: A wiring unit is disposed at the lower part of the base unit and connected to the base unit; and / or A fastening unit is provided at the connection position between the base unit, the lower ceramic sleeve unit, the oil storage unit, the upper ceramic sleeve unit, the expansion unit, and the body unit.

7. The electromagnetic voltage transformer device according to claim 6, characterized in that, The wiring unit includes: A connecting box element is disposed at the lower part of the base unit and connected to the base unit; A wiring element, which is connected to the connection box element; A secondary terminal element is disposed at the outer end of the connecting box element and connected to the connecting box element; A secondary junction box element, wherein the junction box element is connected to the secondary terminal element.

8. The electromagnetic voltage transformer device according to claim 7, characterized in that, The wiring unit also includes: A compensation element is disposed inside the connecting box element.

9. The electromagnetic voltage transformer device according to claim 6, characterized in that, The fastening unit includes: A plurality of fastening elements are respectively disposed at the connection positions between the base unit, the lower ceramic sleeve unit, the oil storage unit, the upper ceramic sleeve unit, the expansion unit, and the body unit.

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