An oil-immersed inverted current mutual inductance device

Abstract

The present invention relates to an oil-immersed inverted current mutual inductance device, comprising a base unit, a porcelain sleeve unit, an oil storage unit, a body unit, an expansion unit and a secondary casting unit, wherein the expansion unit, the oil storage unit, the porcelain sleeve unit, the base unit and the secondary casting unit are sequentially arranged from top to bottom, and the body unit is arranged inside the oil storage unit and the porcelain sleeve unit. The advantage is that the expansion unit is arranged on the top of the oil storage unit, and in the event of an insulation failure, the expansion unit releases the internal pressure of the product outward to ensure that it will not explode, thereby improving safety.

Description

Technical Field

[0001] The invention relates to the technical field of mutual inductors, and in particular to an oil-immersed inverted current mutual inductor device. Background Art

[0002] In the process of power transmission, energy loss is inevitable, and the energy loss is mainly the heat loss of the conductor. Heat loss is equal to the square of the current multiplied by the resistance value, and the conductor resistance is affected by materials, costs, etc., and it is impossible to reduce it to a very small value. Therefore, in order to reduce the loss, the current in the line must be reduced as much as possible. We all know that when the transmission power is constant, increasing the transmission voltage can reduce the transmission current, thereby effectively reducing the loss generated during transmission. my country has a vast territory and a long transmission distance, so high-voltage transmission is of greater significance. At present, my country has gradually entered the era of ultra-high voltage transmission, and 800kV transmission and transformation technology has become the main project in my country's power system. Current transformer is an important primary equipment in the power system. There are very few manufacturers of 550kV current transformers, and there are no domestic manufacturers of 800kV current transformers, so the development of 800kV current transformers is of great significance.

[0003] The current transformer converts the primary current of the high voltage circuit into the standard secondary current of the low voltage circuit in proportion based on the principle of electromagnetic induction, and then supplies the current to measuring instruments, meters, relays and other equipment, so as to monitor and monitor the operation of the power equipment.

[0004] The oil-immersed inverted current transformer has the advantages of small size and small oil consumption. Compared with the upright current transformer, the primary structure of the inverted current transformer is shorter, so it can meet higher dynamic thermal stability current, so its application in power systems is becoming more and more extensive.

[0005] In view of the structure of the inverted current transformer, the secondary coil of the product is located in the ring part of the body, that is, in the oil storage cabinet of the product. Whether it is the excessive heat in the low-voltage shielding tube caused by the secondary open circuit of the product, or the aging of the product insulation due to other reasons, or the lack of oil due to other reasons such as oil leakage, these reasons may cause insulation failure in the ring part of the body.

[0006] Currently, no effective solution has been proposed for the problem of insulation failure that is prone to occur in related technologies. Summary of the invention

[0007] The purpose of the present invention is to provide an oil-immersed inverted current mutual inductance device to solve the problem of insulation failure that is prone to occur in the related art in view of the deficiencies in the prior art.

[0008] To achieve the above object, the technical solution adopted by the present invention is:

[0009] An oil-immersed inverted current mutual inductance device, suitable for 800kV, comprising:

[0010] Base unit;

[0011] A porcelain sleeve unit, which is arranged on the upper part of the base unit and connected to the base unit;

[0012] An oil storage unit, the oil storage unit is arranged on the upper part of the porcelain sleeve unit and connected to the porcelain sleeve unit;

[0013] A body unit, wherein the straight portion of the body unit is arranged inside the porcelain sleeve unit, and the ring portion of the body unit is arranged inside the oil storage unit;

[0014] An expansion unit, which is arranged on the upper part of the oil storage unit and is used to adjust the volume change of the insulating oil inside the product due to temperature change, and release the internal pressure of the oil-immersed inverted current mutual inductance device to the outside when there is an insulation fault in the product;

[0015] The secondary casting body unit is respectively connected to the base unit and the body unit, and is used for leading out the secondary line, grounding the body, and draining and replenishing oil from the product.

[0016] In some of these embodiments, the base unit comprises:

[0017] A base element, the base element is placed on a horizontal plane and is respectively connected to the porcelain sleeve unit and the secondary casting body unit;

[0018] A first fixing element is arranged on the upper part of the base element and connected to the body unit.

[0019] In some embodiments, the porcelain sleeve unit comprises:

[0020] A porcelain sleeve component, wherein the porcelain sleeve component is sleeved outside the straight portion of the body unit;

[0021] A lower flange component, which is arranged at the lower part of the porcelain sleeve component and connected to the base unit;

[0022] An upper flange component is arranged on the upper part of the porcelain sleeve component and is connected to the oil storage unit.

[0023] In some embodiments, the oil storage unit comprises:

[0024] An oil storage element, wherein the oil storage element is connected to the porcelain sleeve unit and the expansion unit respectively;

[0025] A primary conductive element, the primary conductive element passes through the ring portion of the body unit and is arranged through both sides of the oil storage element;

[0026] A primary wiring terminal element is provided at both ends of the primary conductive element and is connected to the primary conductive element.

[0027] In some of the embodiments, the body unit comprises:

[0028] A body element, wherein the straight portion of the body element is arranged inside the porcelain sleeve unit, and the ring portion of the body element is arranged inside the oil storage unit;

[0029] A low-voltage lead element, which is disposed inside the body element and connected to the base unit;

[0030] A connecting element, wherein the connecting element is connected to the low-voltage lead element and the secondary casting body unit respectively;

[0031] A plurality of end screen elements, wherein the plurality of end screen elements are distributed and arranged on the straight line portion of the body element;

[0032] A plurality of end ring elements, wherein the plurality of end ring elements are arranged at ends of corresponding end screen elements;

[0033] Among them, several of the end screen elements are arranged from inside to outside along the diameter of the straight part of the body element, and several of the end screen elements are arranged in equal steps from the bottom end of the straight part of the body element to the top end of the straight part of the body element.

[0034] In some of the embodiments, the expansion unit comprises:

[0035] An expansion element, which is disposed on the upper part of the oil storage unit and connected to the oil storage unit, and is used to seal the top of the oil storage unit;

[0036] An explosion-proof element is arranged on the top of the expansion element to ensure the sealing of the product and release the internal pressure of the oil-immersed inverted current transformer to the outside when the oil-immersed inverted current transformer is in the event of an insulation failure.

[0037] In some of the embodiments, the expansion unit further comprises:

[0038] An outer cover element, which is sleeved on the outside of the expansion element and connected to the oil storage unit;

[0039] A window element is provided on a side wall of the outer cover element and is used for observing the oil level status of the expansion unit through the window element.

[0040] In some of the embodiments, the secondary casting unit comprises:

[0041] A secondary casting element, the secondary casting element is arranged at the bottom of the base unit and connected to the base unit;

[0042] A grounding element, the grounding element is connected to the secondary casting element and the base unit respectively, and is used to ground the body unit;

[0043] A valve element is arranged at the end of the secondary casting element and is used for draining and replenishing oil from the product.

[0044] In some of the embodiments, it also includes:

[0045] A fastening unit is detachably connected to the base unit, the porcelain sleeve unit, the oil storage unit, the body unit, the expansion unit, and the secondary casting unit.

[0046] In some of the embodiments, the fastening unit comprises:

[0047] A first fastening element, wherein the first fastening element is detachably connected to the base unit and the porcelain sleeve unit respectively;

[0048] A second fastening element, wherein the second fastening element is detachably connected to the porcelain sleeve unit and the oil storage unit respectively;

[0049] A third fastening element, wherein the third fastening element is detachably connected to the base unit and the body unit respectively;

[0050] A fourth fastening element is detachably connected to the base unit and the secondary casting body unit respectively.

[0051] In some of the embodiments, it also includes:

[0052] The lug units are distributed on the base unit and the oil storage unit.

[0053] In some of the embodiments, the ear unit comprises:

[0054] A plurality of first lifting lug elements, wherein the plurality of first lifting lug elements are distributed and arranged on the oil storage unit;

[0055] A plurality of second hanging ear elements are distributed on the base unit.

[0056] The present invention adopts the above technical solution, and has the following technical effects compared with the prior art:

[0057] An oil-immersed inverted current mutual inductance device of the present invention has an expansion unit arranged on the top of the oil storage unit. In the event of an insulation failure, the expansion unit will preferentially release the internal pressure of the product outward to ensure that the product will not explode, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1a~1b is a schematic diagram of an oil-immersed inverted current mutual inductance device according to an embodiment of the present invention;

[0059] Figure 2 is a schematic diagram of a base unit according to an embodiment of the present invention;

[0060] Figure 3 is a schematic diagram of a porcelain sleeve unit according to an embodiment of the present invention;

[0061] Figure 4 is a schematic diagram of an oil storage unit according to an embodiment of the present invention;

[0062] Figure 5 is a schematic diagram of a body unit according to an embodiment of the present invention;

[0063] Figure 6 is a schematic diagram of an expansion unit according to an embodiment of the present invention;

[0064] Figure 7 is a schematic diagram of a secondary casting body unit according to an embodiment of the present invention;

[0065] Figure 8 is a schematic diagram of a hanging ear unit according to an embodiment of the present invention.

[0066] The reference numerals are: 100, base unit; 101, base element; 102, first fixing element;

[0067] 200, porcelain sleeve unit; 201, porcelain sleeve component; 202, lower flange component; 203, upper flange component;

[0068] 300, oil storage unit; 301, oil storage element; 302, primary conductive element; 303, primary terminal element;

[0069] 400, body unit; 401, body element; 402, low voltage lead element; 403, connecting element;

[0070] 500, expansion unit; 501, expansion element; 502, explosion-proof element; 503, outer cover element; 504, window element;

[0071] 600, secondary casting unit; 601, secondary casting element; 602, grounding element;

[0072] 700, ear unit; 701, first ear element; 702, second ear element. DETAILED DESCRIPTION

[0073] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0074] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0075] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0076] Example 1

[0077] An exemplary embodiment of the present invention is as follows Figure 1a~1b As shown, an oil-immersed inverted current mutual inductance device, suitable for 800 kV, includes a base unit 100, a porcelain sleeve unit 200, an oil storage unit 300, a body unit 400, an expansion unit 500 and a secondary casting unit 600. Among them, the porcelain sleeve unit 200 is arranged on the upper part of the base unit 100 and connected to the base unit 100; the oil storage unit 300 is arranged on the upper part of the porcelain sleeve unit 200 and connected to the porcelain sleeve unit 200; the straight part of the body unit 400 is arranged inside the porcelain sleeve unit 200, and the ring part of the body unit 400 is arranged inside the oil storage unit 300; the expansion unit 500 is arranged on the upper part of the oil storage unit 300, and is used to adjust the volume change of the insulating oil inside the combined mutual inductor due to temperature change, and when the product is in the case of insulation failure, the internal pressure of the oil-immersed inverted current mutual inductance device is released outwardly; the secondary cast body unit 600 is respectively connected to the base unit 100 and the body unit 400, and is used for the lead-out of the secondary line, the grounding of the body, and the draining and replenishing of oil for the product.

[0078] Among them, the oil-immersed inverted current mutual inductance device of the present invention is suitable for 800kV.

[0079] like Figure 2As shown, the base unit 100 includes a base element 101 and a first fixing element 102. The base element 101 is placed on a horizontal plane and connected to the porcelain sleeve unit 200 and the secondary casting unit 600 respectively; the first fixing element 102 is arranged on the upper part of the base element 101 and connected to the body unit 400.

[0080] The base element 101 includes a support platform and at least four support legs, and the support legs are arranged around the support platform.

[0081] In some of the embodiments, the support legs are arranged to be inclined outward.

[0082] In some of the embodiments, the support legs are fixed to the horizontal surface by bolts.

[0083] In some of the embodiments, the longitudinal section of the first fixing element 102 is U-shaped.

[0084] In some of the embodiments, the first fixing element 102 is detachably connected to the body unit 400, including but not limited to snap connection, threaded connection, etc.

[0085] In some of the embodiments, the first fixing element 102 is a fixing bracket.

[0086] Furthermore, the base unit 100 further includes a plurality of first mounting hole elements. The plurality of first mounting hole elements are distributed on the upper portion of the base element 101 and are detachably connected to the porcelain sleeve unit 200 respectively.

[0087] In some of the embodiments, a plurality of first mounting hole elements are arranged around the central axis of the base element 101 as the center line.

[0088] In some of the embodiments, the number of first mounting hole elements is at least three.

[0089] In some of the embodiments, the first mounting hole element is a threaded hole.

[0090] Furthermore, the base unit 100 further includes a plurality of second mounting hole elements, which are distributed at the lower portion of the base element 101 and are detachably connected to the secondary casting body units 600 , respectively.

[0091] In some of the embodiments, a plurality of second mounting hole elements are arranged around the central axis of the base element 101 as the center line.

[0092] In some of the embodiments, the number of the second mounting hole elements is four.

[0093] In some of the embodiments, the second mounting hole element is a threaded hole.

[0094] like Figure 3 As shown, the porcelain sleeve unit 200 includes a porcelain sleeve element 201, a lower flange element 202 and an upper flange element 203. The porcelain sleeve element 201 is sleeved on the outside of the straight portion of the body unit 400; the lower flange element 202 is arranged at the lower part of the porcelain sleeve element 201 and connected to the base unit 100; the upper flange element 203 is arranged at the upper part of the porcelain sleeve element 201 and connected to the oil storage unit 300.

[0095] Specifically, the porcelain sleeve component 201 is arranged on the upper part of the base component 101 ; the lower flange component 202 is detachably connected to the base component 101 .

[0096] The lower flange component 202 is sleeved on the exterior of the porcelain sleeve component 201 , and the end surface of the lower flange component 202 is located at the same horizontal plane as the end surface of the porcelain sleeve component 201 .

[0097] In some of the embodiments, the lower flange component 202 is bonded to the porcelain sleeve component 201 .

[0098] The upper flange component 203 is sleeved on the outer part of the porcelain sleeve component 201 , and the end surface of the upper flange component 203 is located at the same horizontal plane as the end surface of the porcelain sleeve component 201 .

[0099] In some of the embodiments, the upper flange component 203 is bonded to the porcelain sleeve component 201 .

[0100] Furthermore, the porcelain sleeve unit 200 further includes a plurality of third mounting hole elements. The plurality of third mounting hole elements are distributed on the lower flange element 202 and are detachably connected to the base unit 100 respectively.

[0101] Specifically, the third mounting hole element is detachably connected to the corresponding first mounting hole element.

[0102] In some of the embodiments, a plurality of third mounting hole elements are arranged around the central axis of the lower flange element 202 as the center line.

[0103] In some of the embodiments, the number of the third mounting elements is the same as the number of the first mounting hole elements.

[0104] In some of the embodiments, the number of the third mounting hole elements is at least three.

[0105] In some of the embodiments, the third mounting hole element is a threaded hole.

[0106] Furthermore, the porcelain sleeve unit 200 further includes a plurality of fourth mounting hole elements, which are distributed on the upper flange element 203 and are detachably connected to the oil storage unit 300 .

[0107] In some of the embodiments, a plurality of fourth mounting hole elements are arranged around the central axis of the upper flange element 203 as the center line.

[0108] In some of the embodiments, the number of the fourth mounting hole elements is at least three.

[0109] In some of the embodiments, the fourth mounting hole element is a threaded hole.

[0110] like Figure 4 As shown, the oil storage unit 300 includes an oil storage element 301, a primary conductive element 302 and a primary wiring terminal element 303. The oil storage element 301 is connected to the porcelain sleeve unit 200 and the expansion unit 500 respectively; the primary conductive element 302 passes through the ring portion of the body unit 400 and is arranged on both sides of the oil storage element 301; the primary wiring terminal element 303 is arranged at both ends of the primary conductive element 302 and is connected to the primary conductive element 302.

[0111] Specifically, the oil storage element 301 is disposed on the upper portion of the porcelain sleeve element 201 and is detachably connected to the upper flange element 203 .

[0112] In some of the embodiments, the longitudinal section of the oil storage element 301 is composed of a rectangle (such as a long rectangle or a square) and two trapezoids, and the two trapezoids are respectively disposed at two ends of the rectangle.

[0113] In some embodiments, the primary conductive element 302 is a conductive rod.

[0114] In some embodiments, the primary terminal element 303 is detachably connected to the primary conductive element 302 .

[0115] Furthermore, the oil storage unit 300 further includes a plurality of fifth mounting hole elements. The plurality of fifth mounting hole elements are distributed at the lower part of the oil storage element 301 and are detachably connected to the porcelain sleeve unit 200 .

[0116] Specifically, the fifth mounting hole element is detachably connected to the corresponding fourth mounting hole element.

[0117] In some of the embodiments, a plurality of fifth mounting hole elements are arranged around the central axis of the oil storage element 301 as the center line.

[0118] In some of the embodiments, the number of the fifth mounting elements is the same as the number of the fourth mounting hole elements.

[0119] In some of the embodiments, the number of the fifth mounting hole elements is at least three.

[0120] In some of the embodiments, the fifth mounting hole element is a threaded hole.

[0121] like Figure 5 As shown, the body unit 400 includes a body element 401, a low-voltage lead element 402, a connecting element 403, a plurality of end screen elements and a plurality of end ring elements. The straight portion of the body element 401 is arranged inside the porcelain sleeve unit 200, and the ring portion of the body element 401 is arranged inside the oil storage unit 300; the low-voltage lead element 402 is arranged inside the body element 401, and the low-voltage lead element 402 is connected to the base unit 100; the connecting element 403 is respectively connected to the low-voltage lead element 402 and the secondary casting body unit 600; a plurality of end screen elements are distributed and arranged on the straight portion of the body element 401; a plurality of end ring elements are arranged at the ends of the corresponding end screen elements; the plurality of end screen elements are arranged from inside to outside along the diameter of the straight portion of the body element 401, and the plurality of end screen elements are arranged in equal steps from the bottom end of the straight portion of the body element 401 to the top end of the straight portion of the body element 401.

[0122] Specifically, the straight portion of the body element 401 is arranged inside the porcelain sleeve element 201 , and the ring portion of the body element 401 is arranged inside the oil storage element 301 ; the low-voltage lead element 402 is detachably connected to the first fixing element 102 .

[0123] The device body element 401 also includes an intermediate main screen element and a low-voltage screen element.

[0124] In some of the embodiments, the lower portion of the low-voltage lead element 402 is protruded from the lower portion of the straight portion of the body element 401 .

[0125] In some embodiments, the low-voltage lead element 402 is a low-voltage lead tube.

[0126] In some of the embodiments, the connection element 403 is detachably connected to the low voltage lead element 402 .

[0127] In some of the embodiments, the connection element 403 is a copper flexible connection strip.

[0128] In some of the embodiments, the end ring element is a pressure equalizing end ring.

[0129] like Figure 6 As shown, the expansion unit 500 includes an expansion element 501 and an explosion-proof element 502. The expansion element 501 is arranged on the upper part of the oil storage unit 300 and connected to the oil storage unit 300, and is used to seal the top of the oil storage unit 300; the explosion-proof element 502 is arranged on the top of the expansion element 501, and is used to ensure the sealing of the product, and release the internal pressure of the oil-immersed inverted current transformer to the outside when the oil-immersed inverted current transformer is in the case of insulation failure.

[0130] Specifically, the expansion element 501 is disposed on the upper portion of the oil storage element 301 and is detachably connected to the oil storage element 301 .

[0131] The expansion element 501 is made of metal material, which can effectively adjust the volume change of the insulating oil inside the product caused by temperature change, thereby ensuring the sealing of the product.

[0132] In some of the embodiments, the expansion element 501 is made of stainless steel.

[0133] In some of the embodiments, the expansion element 501 is a metal expander.

[0134] In some of the embodiments, the explosion-proof element 502 is detachably connected to the top of the expansion element 501, including but not limited to a bolt connection.

[0135] In some of the embodiments, the explosion-proof element 502 is a explosion-proof disk.

[0136] Furthermore, the expansion unit 500 further includes a cover element 503 and a window element 504. The cover element 503 is sleeved on the outside of the expansion element 501 and connected to the oil storage unit 300; the window element 504 is arranged on the side wall of the cover element 503, and is used to observe the oil level state of the expansion unit 500 through the window element 504.

[0137] Specifically, the outer cover element 503 is detachably connected to the oil storage element 301 .

[0138] In some of the embodiments, the outer cover element 503 is bolted to the oil storage element 301 .

[0139] In some of these embodiments, the housing element 503 is an expander housing.

[0140] In some of the embodiments, the window element 504 is an oil level sight glass.

[0141] like Figure 7 As shown, the secondary casting body unit 600 includes a secondary casting element 601, a grounding element 602 and a valve element. The secondary casting element 601 is arranged at the bottom of the base unit 100 and connected to the base unit 100; the grounding element 602 is respectively connected to the secondary casting element 601 and the base unit 100, and is used to ground the body unit 400; the valve element is arranged at the end of the secondary casting element 601, and is used to drain and replenish oil from the product.

[0142] Specifically, the secondary casting element 601 is disposed at the bottom of the base element 101 and is detachably connected to the base element 101; the grounding element 602 is detachably connected to the base element 101; and the valve element is used for draining and replenishing oil in the product.

[0143] In some of the embodiments, the secondary casting element 601 is disposed protruding from the base element 101 .

[0144] In some of the embodiments, the secondary cast element 601 is a secondary cast body.

[0145] In some of the embodiments, the grounding element 602 is detachably connected to the secondary casting element 601 .

[0146] In some of the embodiments, the longitudinal section of the grounding element 602 is L-shaped.

[0147] In some embodiments, the grounding element 602 is a grounding bent plate.

[0148] In some of the embodiments, the valve element is an oil drain valve.

[0149] Furthermore, the secondary casting body unit 600 further includes a plurality of sixth mounting hole elements. The plurality of sixth mounting hole elements are distributed at one end of the secondary casting element 601 and are detachably connected to the base unit 100 .

[0150] Specifically, a plurality of sixth mounting hole elements are detachably connected to the base element 101 .

[0151] More specifically, the sixth mounting hole element is detachably connected to the corresponding second mounting hole element.

[0152] In some of the embodiments, a plurality of sixth mounting hole elements are arranged around a central axis of an end portion of the secondary casting element 601 as a center line.

[0153] In some of the embodiments, the number of the sixth mounting hole elements is the same as the number of the second mounting hole elements.

[0154] In some of the embodiments, the sixth mounting hole element is a threaded hole.

[0155] Furthermore, the oil-immersed inverted current transformer device also includes a fastening unit, which is detachably connected to the base unit 100, the porcelain sleeve unit 200, the oil storage unit 300, the body unit 400, the expansion unit 500, and the secondary casting unit 600.

[0156] like Figure 8As shown, the fastening unit includes a first fastening element, a second fastening element, a third fastening element and a fourth fastening element. The first fastening element is detachably connected to the base unit 100 and the porcelain sleeve unit 200; the second fastening element is detachably connected to the porcelain sleeve unit 200 and the oil storage unit 300; the third fastening element is detachably connected to the base unit 100 and the body unit 400; and the fourth fastening element is detachably connected to the base unit 100 and the secondary casting unit 600.

[0157] Specifically, the first fastening element is detachably connected to the base element 101 and the lower flange element 202; the second fastening element is detachably connected to the upper flange element 203 and the oil storage element 301; the third fastening element is detachably connected to the first fixing element 102 and the low-voltage lead element 402; the fourth fastening element is detachably connected to the base element 101 and the secondary casting element 601.

[0158] More specifically, the first fastening element is detachably connected to the first mounting hole element and the third mounting hole element respectively; the second fastening element is detachably connected to the fourth mounting hole element and the fifth mounting hole element respectively; the fourth fastening element is detachably connected to the second mounting hole element and the sixth mounting hole element respectively.

[0159] In some of the embodiments, the number of the first fastening elements is equal to the number of the first mounting hole elements.

[0160] In some of the embodiments, the number of the second fastening elements is equal to the number of the fourth mounting hole elements.

[0161] In some of the embodiments, the number of the third fastening elements is equal to the number of the first fixing elements 102 .

[0162] In some of the embodiments, the number of the fourth fastening elements is equal to the number of the second mounting hole elements.

[0163] In some of the embodiments, the first fastening element is a fastening bolt.

[0164] In some of the embodiments, the second fastening element is a fastening bolt.

[0165] In some of the embodiments, the third fastening element is a fastening nut.

[0166] In some of the embodiments, the fourth fastening element is a fastening bolt.

[0167] Furthermore, the oil-immersed inverted current mutual inductance device further includes a lifting lug unit 700. The lifting lug unit 700 is distributed and arranged on the base unit 100 and the oil storage unit 300.

[0168] like Figure 8 As shown, the eye unit 700 includes a plurality of first eye elements 701 and a plurality of second eye elements 702. The plurality of first eye elements 701 are distributed on the oil storage unit 300; and the plurality of second eye elements 702 are distributed on the base unit 100.

[0169] Specifically, a plurality of first lifting lug elements 701 are distributed on the outside of the oil storage element 301 ; and a plurality of second lifting lug elements 702 are distributed on the base element 101 .

[0170] In some of the embodiments, a plurality of first lifting ear elements 701 are symmetrically arranged with the central axis of the oil storage element 301 as the center.

[0171] In some embodiments, there are two first ear elements 701 .

[0172] In some of the embodiments, the first lifting ear element 701 is fixedly connected to the oil storage element 301 .

[0173] In some of the embodiments, the first lifting ear element 701 is detachably connected to the oil storage element 301, including but not limited to bolt connection.

[0174] In some of the embodiments, the second ear element 702 is disposed on a supporting foot of the base element 101 .

[0175] In some embodiments, the number of the second ear elements 702 is equal to the number of the supporting feet.

[0176] In some of the embodiments, the second ear element 702 is fixedly connected to the base element 101 .

[0177] Example 2

[0178] A specific embodiment of the present invention.

[0179] An oil-immersed inverted current transformer suitable for 800kV includes a base, a bracket, a porcelain sleeve, an oil storage cabinet, a body fixing frame, a primary conductive rod, a primary wiring terminal, a body, a low-voltage lead pipe, a copper flexible connecting belt, a metal expander, an explosion-proof disk, an expander cover, an oil level observation window, a secondary casting body, a grounding bent plate and a fastening nut.

[0180] The metal expander is connected to the top of the oil conservator, the bottom of the oil conservator is connected to the top of the porcelain sleeve, the bottom of the porcelain sleeve is connected to the base, and the secondary casting body is installed on the base.

[0181] The ring part of the body is located in the oil storage cabinet. The straight part of the body is located in the porcelain sleeve. The low-voltage lead pipe of the body is firmly fixed to the bracket on the product base through the fastening nut to ensure the stability of the straight part of the body. The low-voltage screen of the body is connected to the low-voltage screen terminal on the secondary casting body installed on the base through the copper soft connection belt connected to the low-voltage lead pipe.

[0182] Since the insulation of the 800kV oil-immersed inverted current transformer is very thick, in order to improve the utilization rate of insulation, the body is equipped with an intermediate main screen, and the straight part is also equipped with multiple end screens with end rings. These end screens are arranged from the inside to the outside along the diameter direction of the straight part of the body, and are arranged in equal steps from the bottom of the product low-voltage lead tube to the ring part. This end screen design improves the utilization rate of insulation, and the end ring design effectively improves the field strength at the end of each end screen.

[0183] The top of the metal expander is equipped with an explosion-proof disk, and the outside of the metal expander is equipped with an expander cover with an oil level inspection window. The metal expander (made of stainless steel, can effectively adjust the volume change of the insulating oil inside the product caused by temperature changes, ensuring the sealing of the product. Moreover, the explosion-proof disk located on the top of the metal expander is the part with the lowest pressure resistance value. When the product fails, it will act immediately to release the pressure to ensure that the product will not explode. And through the oil level observation window on the expander cover, we can observe the status of the oil level at any time.

[0184] The secondary casting body installed on the product base is equipped with an oil drain valve, through which oil can be taken out and replenished for the product. The low-voltage screen terminal on the casting body is connected to the base through a grounding bent plate to achieve grounding of the low-voltage screen of the device body.

[0185] The lifting lugs installed on the oil storage cabinet and the base of the product provide a variety of lifting methods for the product. During the manufacturing, transportation and installation of the product, a variety of lifting methods can be selected according to different situations.

[0186] The advantages of the present invention are as follows:

[0187] 1. Since the insulation of the 800kV oil-immersed inverted current transformer is very thick, according to conventional design, the field strength near the low-voltage screen is very high, while the field strength near the high-voltage screen is very low. In order to effectively utilize the insulation of the product, the product has an intermediate main screen in addition to the high-voltage screen and the low-voltage screen, which improves the utilization rate of the insulation and improves the uneven field strength.

[0188] 2. The straight part of the device body is provided with a plurality of end screens with end rings. The end screens can effectively utilize the insulation of the device body, while the end rings can effectively improve the end field strength.

[0189] 3. An explosion-proof plate is installed on the top of the expander. When the ring part of the product fails, the explosion-proof plate will take priority to prevent the product from exploding.

[0190] 4. The bracket on the product base has a fixing hole. The low-voltage lead tube of the product body can pass through the fixing hole on the bracket, and then the low-voltage lead tube is firmly fixed by tightening the nut, thereby ensuring that the straight part of the body is stable and will not move in any direction.

[0191] 5. The oil conservator and the porcelain sleeve are connected by bolts, so that the same oil conservator mold can produce oil conservators connected with different porcelain sleeves, reducing the mold cost of parts production.

[0192] 6. The low-voltage screen of the product is led out through the secondary casting body, and then connected to the base through the grounding bent plate to achieve grounding. During the maintenance and inspection during the operation of the product, the grounding of the low-voltage screen can be disconnected by disconnecting the grounding bent plate, so as to carry out some electrical tests, which is simple and convenient to operate.

[0193] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. An oil-immersed inverted current mutual inductance device, suitable for 800kV, characterized in that: include: Base unit; A porcelain sleeve unit, which is arranged on the upper part of the base unit and connected to the base unit; An oil storage unit, the oil storage unit is arranged on the upper part of the porcelain sleeve unit and connected to the porcelain sleeve unit; A body unit, wherein the straight portion of the body unit is arranged inside the porcelain sleeve unit, and the ring portion of the body unit is arranged inside the oil storage unit; An expansion unit, which is arranged on the upper part of the oil storage unit and is used to adjust the volume change of the insulating oil inside the product due to temperature change, and release the internal pressure of the oil-immersed inverted current mutual inductance device to the outside when there is an insulation fault in the product; A secondary casting unit, which is connected to the base unit and the body unit respectively, and is used for leading out the secondary line, grounding the body, and draining and replenishing oil from the product; Wherein, the body unit comprises: A body element, wherein the straight portion of the body element is arranged inside the porcelain sleeve unit, and the ring portion of the body element is arranged inside the oil storage unit; A low-voltage lead element, which is disposed inside the body element and connected to the secondary casting unit; A connecting element, wherein the connecting element is connected to the low-voltage lead element and the secondary casting body unit respectively; A plurality of end screen elements, wherein the plurality of end screen elements are distributed and arranged on the straight line portion of the body element; A plurality of end ring elements, wherein the plurality of end ring elements are arranged at ends of corresponding end screen elements; Wherein, a plurality of the end screen elements are arranged from inside to outside along the diameter of the straight portion of the body element, and a plurality of the end screen elements are arranged in equal steps from the bottom end of the straight portion of the body element to the top end of the straight portion of the body element; Wherein, the expansion unit comprises: An expansion element, which is disposed on the upper part of the oil storage unit and connected to the oil storage unit, and is used to adjust the volume change of the insulating oil inside the product caused by temperature change; An explosion-proof element, which is arranged on the top of the expansion element, and is used to ensure the sealing of the product and release the internal pressure of the oil-immersed inverted current transformer to the outside when the oil-immersed inverted current transformer is in the event of an insulation failure; An outer cover element, which is sleeved on the outside of the expansion element and connected to the oil storage unit; a window element, the window element being arranged on a side wall of the outer cover element and being used for observing the oil level state of the expansion unit through the window element; Wherein, the secondary casting unit comprises: A secondary casting element, the secondary casting element is arranged at the bottom of the base unit and connected to the base unit; A grounding element, the grounding element is connected to the secondary casting element and the base unit respectively, and is used to ground the body unit; A valve element is arranged at the end of the secondary casting element and is used for draining and replenishing oil from the product.

2. The oil-immersed inverted current transformer device according to claim 1, characterized in that: The base unit comprises: A base element, the base element is placed on a horizontal plane and is respectively connected to the porcelain sleeve unit and the secondary casting body unit; A first fixing element is arranged on the upper part of the base element and connected to the body unit.

3. The oil-immersed inverted current transformer device according to claim 1, characterized in that: The porcelain sleeve unit comprises: A porcelain sleeve component, wherein the porcelain sleeve component is sleeved outside the straight portion of the body unit; A lower flange component, which is arranged at the lower part of the porcelain sleeve component and connected to the base unit; An upper flange component is arranged on the upper part of the porcelain sleeve component and is connected to the oil storage unit.

4. The oil-immersed inverted current mutual inductance device according to claim 1, characterized in that: The oil storage unit comprises: An oil storage element, wherein the oil storage element is connected to the porcelain sleeve unit and the expansion unit respectively; A primary conductive element, the primary conductive element passes through the ring portion of the body unit and is disposed across both sides of the oil storage element; A primary wiring terminal element is provided at both ends of the primary conductive element and is connected to the primary conductive element.

5. The oil-immersed inverted current transformer device according to any one of claims 1 to 4, characterized in that: Also includes: A fastening unit, wherein the fastening unit is detachably connected to the base unit, the porcelain sleeve unit, the oil storage unit, the body unit, the expansion unit, and the secondary casting unit; and / or The lifting lug units are distributed on the base unit and the oil storage unit.

6. The oil-immersed inverted current mutual inductance device according to claim 5, characterized in that: The fastening unit comprises: A first fastening element, wherein the first fastening element is detachably connected to the base unit and the porcelain sleeve unit respectively; A second fastening element, wherein the second fastening element is detachably connected to the porcelain sleeve unit and the oil storage unit respectively; A third fastening element, wherein the third fastening element is detachably connected to the base unit and the body unit respectively; a fourth fastening element, wherein the fourth fastening element is detachably connected to the base unit and the secondary casting body unit respectively; and / or The hanging ear unit comprises: A plurality of first lifting lug elements, wherein the plurality of first lifting lug elements are distributed and arranged on the oil storage unit; A plurality of second hanging ear elements are distributed on the base unit.

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