CN220381909U - Explosion-proof oil-immersed current transformer - Google Patents
Explosion-proof oil-immersed current transformer Download PDFInfo
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- CN220381909U CN220381909U CN202321555843.9U CN202321555843U CN220381909U CN 220381909 U CN220381909 U CN 220381909U CN 202321555843 U CN202321555843 U CN 202321555843U CN 220381909 U CN220381909 U CN 220381909U
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- oil storage
- oil
- expander
- storage cabinet
- explosion
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- 239000002131 composite material Substances 0.000 claims abstract description 42
- 239000011152 fibreglass Substances 0.000 claims abstract description 26
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 17
- 238000007689 inspection Methods 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 238000004804 winding Methods 0.000 claims description 22
- 239000011521 glass Substances 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000004880 explosion Methods 0.000 abstract description 20
- 230000002093 peripheral effect Effects 0.000 abstract description 10
- 239000012634 fragment Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 6
- 238000009413 insulation Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 3
- 230000009172 bursting Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Landscapes
- Housings And Mounting Of Transformers (AREA)
Abstract
The utility model relates to an explosion-proof oil immersed current transformer, wherein a shell of an oil storage cabinet comprises two first glass fiber reinforced plastic composite material layers, a first aluminum alloy layer is arranged between the two first glass fiber reinforced plastic composite material layers, an expander outer cover is arranged on the outer side of the expander, an oil level inspection window is arranged on the expander outer cover, a pressing plate is arranged on the inner side of an opening at the lower end of the expander outer cover, a connecting flange is arranged on the outer side of an opening at the upper end of the oil storage cabinet, the pressing plate is fixed on the connecting flange through press-fit screws in a press-fit mode, a sealing gasket is arranged between the pressing plate and the connecting flange, the expander outer cover comprises an outer second glass fiber reinforced plastic composite material layer and an inner second aluminum alloy layer, and the oil level inspection window comprises a plurality of layers of transparent films. The utility model can effectively avoid the damage to personnel of peripheral equipment caused by the splashing of the shell fragments during explosion.
Description
Technical Field
The utility model relates to the technical field of current transformers, in particular to an explosion-proof oil-immersed current transformer.
Background
The oil immersed inverted current transformer is provided with an expander for compensating the volume change of insulating oil in the transformer due to temperature change, and isolating the insulating oil from the external environment, so that the insulating oil is prevented from being wetted, aged and deteriorated, and the running safety of products is ensured. However, the oil immersed inverted current transformer is inflammable in raw materials due to the oil paper insulating structure, and is generally provided with a cylindrical or spherical-like shell, when the internal pressure of the oil immersed inverted current transformer is increased, the plastic deformation is small, and for fault points far away from the expander, due to small oil gaps, large transformer oil flow resistance and untimely pressure transmission, so that the expander has weak protection capability as a pressure release device, and when an insulating fault occurs in the operation of the transformer, the explosion of the transformer caused by the internal fault arc of the transformer can cause the ignition of transformer oil and insulating paper, and can cause the splashing of shell fragments to damage peripheral equipment and even personnel, thereby seriously threatening the operation safety of a power system.
In order to solve the above problems, the prior art generally adopts a structure provided with a rupture disk (or rupture disk), for example, a structure disclosed in chinese patent publication No. CN115691991a, which comprises a stop lever, a rupture disk and other structures, wherein a stainless steel bellows, a flange plate and an upper cover plate can move along a smooth section of the stop lever in a vertical direction, the rupture disk is in a circular structure, the rupture disk is arranged between the upper cover plate and the flange plate and is recessed towards the stainless steel bellows to form a concave arc surface, an exhaust valve is arranged on the rupture disk, so that gas in a product can be discharged during oiling, and when the pressure in the product reaches the limit pressure which can be borne by the rupture disk, the rupture disk can burst the pressure in the product.
Another example is that chinese patent publication number CN104867670B discloses an oil immersed current transformer with explosion-proof device, which sets explosion venting devices on the upper oil tank and the base, the structure of the explosion venting device is as follows: the upper oil storage cabinet and the base are correspondingly welded with flanges, the two guide pipes are respectively connected with the upper oil storage cabinet and the base through the flanges, the explosion-proof sheet is pressed between the two flanges, and when the transformer breaks down, huge expansion shock waves generated inside can open the nearby explosion-proof sheet to release pressure.
However, the above structure is relatively complex, and the pressure can be released only to reduce damage to the product, and the problems of splashing of the shell fragments and the like cannot be avoided.
Disclosure of Invention
The utility model aims to provide an explosion-proof oil immersed current transformer which can effectively avoid damage to personnel of peripheral equipment caused by splashing of shell fragments during explosion.
The aim of the utility model is realized by the following technical scheme:
the utility model provides an explosion-proof formula current transformer that oil immersed, includes ware body, hollow insulating sleeve, oil storage tank, primary winding, secondary winding and expander, wherein the ware body is located in the hollow insulating sleeve, and in the oil storage tank was located on secondary winding upper portion, the secondary winding lower part was located in the ware body, and the primary winding was located in the oil storage tank and passed the secondary winding, and the oil storage tank upside was located to the expander, the casing of oil storage tank includes two-layer first glass steel composite material layers to be equipped with first aluminum alloy layer between two-layer first glass steel composite material layers, the expander outside is equipped with the expander dustcoat, and be equipped with the oil level inspection window on the expander dustcoat, expander dustcoat lower extreme opening inboard is equipped with the clamp plate, the upper end opening outside of oil storage tank is equipped with flange, the clamp plate passes through press-fit screw press fit to be fixed on the flange to be equipped with the sealing washer between clamp plate and the flange, the expander dustcoat includes the second glass steel composite material layer in the outside and the second aluminum alloy layer of inboard, the oil level inspection window includes multilayer transparent film.
The oil storage cabinet comprises an upper oil storage cabinet body and a lower oil storage cabinet body, the shell structures of the upper oil storage cabinet body and the lower oil storage cabinet body are the same, the oil storage cabinet comprises two first glass fiber reinforced plastic composite material layers, and a first aluminum alloy layer is arranged between the two first glass fiber reinforced plastic composite material layers.
The oil storage cabinet flange is arranged on the outer side of the lower end of the upper oil storage cabinet body and the outer side of the upper end of the lower oil storage cabinet body, and the oil storage cabinet flange is connected through a connecting bolt.
The hollow insulating sleeve is characterized in that the lower end of the hollow insulating sleeve is provided with a mounting base, one side of the mounting base is provided with a secondary terminal box, the other side of the mounting base is provided with an oiling device, an outgoing line at the lower end of the secondary winding is connected with the secondary terminal box, and insulating oil is filled in the hollow insulating sleeve and the oil storage cabinet.
The utility model has the advantages and positive effects that:
1. the lower end of the expander housing is connected with the connecting flange at the upper end of the oil storage cabinet through the pressing plate and the press-fit bolt, under the condition that the normal use of the expander is not affected, when insulation faults occur in the interior of the transformer, the press-fit connection part of the lower end of the expander housing and the upper end of the oil storage cabinet can be rapidly separated and released due to explosion, the expander housing adopts a glass fiber reinforced plastic composite material-aluminum alloy two-layer composite structure to improve mechanical strength, the high mechanical strength of the composite structure bears explosion impact when the internal arc faults, the glass fiber reinforced plastic composite material prevents the aluminum alloy of the oil storage cabinet from being broken and splashed, so that the explosion and splashing of the expander housing are avoided to damage peripheral equipment personnel, in addition, the oil level inspection window on the expander housing is made by overlapping a plurality of transparent films, so that when the expander is exploded, the transparent films can be broken and released through the oil level inspection window, and the transparent films cannot be broken and splashed like the existing transparent glass materials, so that the damage to peripheral equipment personnel is further reduced.
2. The oil storage cabinet shell is made of a three-layer composite structure of glass fiber reinforced plastic composite material-aluminum alloy-glass fiber reinforced plastic composite material so as to improve mechanical strength, and the oil storage cabinet shell can be integrally separated during explosion, so that the shell is prevented from bursting, splashing and damaging personnel of peripheral equipment.
3. The oil storage cabinet consists of the upper oil storage cabinet body and the lower oil storage cabinet body, so that the upper oil storage cabinet body and the lower oil storage cabinet body can be rapidly separated to release pressure during explosion, and the processing and the installation are convenient.
Drawings
Figure 1 is a schematic view of the structure of the present utility model,
figure 2 is a schematic view of the oil tank in figure 1,
figure 3 is an enlarged view at a in figure 2,
figure 4 is a schematic view of the expander of figure 1,
figure 5 is an enlarged view at B in figure 4,
fig. 6 is an enlarged view at C in fig. 4.
The oil storage cabinet comprises a first glass fiber reinforced plastic composite material layer, a second aluminum alloy layer, a pressing plate, a pressing screw, a sealing gasket, an oil level inspection window frame, an expander, a secondary winding, a primary winding, a device body, an oil injection device and a mounting base, wherein the first glass fiber reinforced plastic composite material layer is 1, the second terminal box is 2, the hollow insulating sleeve is 3, the lower oil storage cabinet is 4, the upper oil storage cabinet is 401, the first glass fiber reinforced plastic composite material layer is 402, the first aluminum alloy layer is 403, the connecting flange is 403, the expander is 5, the outer cover is 501, the second glass fiber reinforced plastic composite material layer is 502, the second aluminum alloy layer is 503, the pressing plate is 504, the pressing screw is 505, the sealing gasket is 6, the oil level inspection window is 601, the inspection window frame is 7, the expander is 8, the secondary winding is 9, the device body is 11, the insulating oil is 11, the oiling device is 13 and the mounting base is arranged.
Detailed Description
The utility model is described in further detail below with reference to the accompanying drawings.
As shown in fig. 1 to 6, the utility model comprises a body 10, a hollow insulating sleeve 2, an oil storage tank, a primary winding 9, a secondary winding 8 and an expander 7, wherein the body 10 is arranged in the hollow insulating sleeve 2 and the oil storage tank, the secondary winding is arranged in the body and is positioned in the oil storage tank, one side of the lower end of the hollow insulating sleeve 2 is provided with a secondary terminal box 1, a lower outlet wire of the secondary winding 8 is connected with the secondary terminal box 1, the primary winding 9 is arranged in the oil storage tank and penetrates through the center of the secondary winding 8, the expander 7 is arranged on the upper side of the oil storage tank, an expander housing 5 is arranged on the outer side of the expander 7, an oil level inspection window 6 is arranged on the expander housing 5, the lower end of the hollow insulating sleeve 2 is provided with a mounting base 13, one side of the mounting base 13 is provided with the secondary terminal box 1, the other side is provided with an oiling device 12, and the hollow insulating sleeve 2 and the oil storage tank are filled with insulating oil 11, and the structure is known in the field.
As shown in fig. 1 to 3, the oil storage cabinet shell comprises two first glass fiber reinforced plastic composite material layers 401, and a first aluminum alloy layer 402 is arranged between the two first glass fiber reinforced plastic composite material layers 401. The glass fiber reinforced plastic composite material is a known material, for example, an explosion-proof shell of a centrifugal fan made of the glass fiber reinforced plastic composite material is disclosed in CN215672876U patent.
As shown in fig. 2, in this embodiment, the oil conservator includes an upper oil conservator body 4 and a lower oil conservator body 3, and the outer shell structures of the upper oil conservator body 4 and the lower oil conservator body 3 are the same, and are three-layer composite structures of glass fiber reinforced plastic composite material-aluminum alloy-glass fiber reinforced plastic composite material, oil conservator flanges are disposed on the outer side of the lower end of the upper oil conservator body 4 and the outer side of the upper end of the lower oil conservator body 3, and are connected through connecting bolts, so that the upper oil conservator body 4 and the lower oil conservator body 3 can be separated and decompressed during explosion, and in addition, the processing and the installation are convenient.
As shown in fig. 4 to 5, the expander housing 5 of the present utility model includes an outer second glass fiber reinforced plastic composite layer 501 and an inner second aluminum alloy layer 502, and the expander housing 5 of the present utility model adopts a two-layer composite structure of glass fiber reinforced plastic composite material-aluminum alloy to improve mechanical strength and resist high pressure during explosion, so as to prevent the expander housing 5 from bursting and splashing.
In addition, in this embodiment, as shown in fig. 1 and fig. 4, the oil level inspection window 6 on the expander housing 5 uses a multilayer transparent film stacked structure to replace the existing glass material inspection window, so that when the expander 7 is exploded, the pressure can burst the transparent film and release the transparent film through the oil level inspection window 6, and the multilayer transparent film is soft in texture, and does not break and splash to damage surrounding equipment like the existing transparent glass material, thereby further reducing damage to surrounding equipment personnel. The material and the layer number of the transparent film are selected and set according to actual needs, but the strength is ensured to meet the normal use requirement of the transformer, and the edges of the transparent films are fixed by press fitting of the observation window frame 601.
As shown in fig. 4 and 6, a pressing plate 503 is disposed inside the opening at the lower end of the expander housing 5, a connecting flange 403 is disposed outside the opening at the upper end of the upper oil tank body 4 of the oil tank, the pressing plate 503 is fixed on the connecting flange 403 by press-fitting with a press-fitting screw 504, and a sealing gasket 505 is disposed between the pressing plate 503 and the connecting flange 403. The lower end opening of the expander housing 5 is communicated with the upper end opening of the upper oil storage cabinet body 4, so that the expander 7 can normally stretch out and draw back to compensate the insulating oil volume change caused by the environmental temperature change under normal use conditions, the sealing gasket 505 ensures sealing, and under the working condition of insulation faults in the transformer, the pressure mounting connection part of the lower end of the expander housing 5 and the upper end of the upper oil storage cabinet body 4 can be rapidly separated and release the internal pressure of a product due to explosion.
The hollow insulating sleeve 2 of the present utility model can be made of a high-strength composite insulating material, so that the explosion and splashing of the insulating sleeve 2 can be avoided when the insulating sleeve is exploded, the composite insulating material is a composite insulating material sleeve type capacitor which is disclosed in the patent of 201320158781.8, for example, and the sleeve has strong explosion-proof, vibration-proof and impact-resistant capabilities. In addition, the utility model can be provided with an on-line monitoring device on the mounting base 13 according to the requirement to monitor and intelligently analyze the pressure, the temperature, the characteristic gas and the like in the transformer in real time, thereby realizing early warning before failure and preventing accidents, and the on-line monitoring device is a well-known technology in the field and is a commercially available product.
The working principle of the utility model is as follows:
the lower end of the expander housing 5 is connected with the connecting flange 403 at the upper end of the oil storage cabinet through the pressing plate 503 and the press-fitting bolt 504, so that under normal use conditions, the expander 7 can stretch and retract normally to compensate insulation oil volume change caused by environmental temperature change, under the working condition of insulation failure in the transformer, the press-fitting connection part of the lower end of the expander housing 5 and the upper end of the upper oil storage cabinet body 4 can be rapidly separated and release product internal pressure due to explosion, the expander housing 5 adopts a glass fiber reinforced plastic composite material-aluminum alloy two-layer composite structure to improve mechanical strength, the expander housing 5 can be integrally separated during explosion, and thus, the explosion splashing is avoided to damage personnel of peripheral equipment, and the oil level inspection window 6 on the expander housing 5 is made of a plurality of layers of transparent films, so that when the expander 7 is exploded, the pressure can break the transparent films through the oil level inspection window 6, and the plurality of layers of transparent films can not break splashing and damage peripheral equipment like the existing transparent glass materials, thereby further reducing damage to personnel of the peripheral equipment.
In addition, the oil storage cabinet shell is made of a three-layer composite structure of glass fiber reinforced plastic composite material-aluminum alloy-glass fiber reinforced plastic composite material so as to improve mechanical strength, so that the oil storage cabinet shell can be integrally separated during explosion, and further peripheral equipment personnel are prevented from being damaged by explosion splashing, and as shown in fig. 2, the oil storage cabinet consists of an upper oil storage cabinet body 4 and a lower oil storage cabinet body 3, and the upper oil storage cabinet body 4 and the lower oil storage cabinet body 3 can be rapidly separated to release pressure during explosion.
Claims (4)
1. The utility model provides an explosion-proof formula current transformer that immersed in oil, includes ware body, hollow insulating sleeve, oil storage tank, primary winding, secondary winding and expander, and wherein the ware body is located hollow insulating sleeve and oil storage tank, and the secondary winding is located the ware body and is located the oil storage tank, and primary winding locates in the oil storage tank and passes the secondary winding, and the expander is located oil storage tank upside, its characterized in that: the casing of oil conservator includes two-layer first glass steel composite material layer (401) to be equipped with first aluminum alloy layer (402) between two-layer first glass steel composite material layer (401), the expander (7) outside is equipped with expander dustcoat (5), and be equipped with oil level inspection window (6) on expander dustcoat (5), expander dustcoat (5) lower extreme opening inboard is equipped with clamp plate (503), the upper end opening outside of oil conservator is equipped with flange (403), clamp plate (503) are fixed through pressure equipment screw (504) pressure equipment on flange (403), and be equipped with sealing pad (505) between clamp plate (503) and flange (403), expander dustcoat (5) include second glass steel composite material layer (501) and inboard second aluminum alloy layer (502) in the outside, oil level inspection window (6) include multilayer transparent film.
2. The explosion-proof oil immersed current transformer according to claim 1, wherein: the oil storage cabinet comprises an upper oil storage cabinet body (4) and a lower oil storage cabinet body (3), the upper oil storage cabinet body (4) and the lower oil storage cabinet body (3) are identical in shell structure, each oil storage cabinet comprises two layers of first glass fiber reinforced plastic composite material layers (401), and a first aluminum alloy layer (402) is arranged between the two layers of first glass fiber reinforced plastic composite material layers (401).
3. The explosion-proof oil immersed current transformer according to claim 2, wherein: the oil storage cabinet flange is arranged at the outer side of the lower end of the upper oil storage cabinet body (4) and the outer side of the upper end of the lower oil storage cabinet body (3), and the oil storage cabinet flange is connected through a connecting bolt.
4. The explosion-proof oil immersed current transformer according to claim 1, wherein: the hollow insulating sleeve (2) lower extreme is equipped with mounting base (13), and mounting base (13) one side is equipped with secondary terminal box (1), and the opposite side is equipped with oiling device (12), secondary winding (8) lower extreme be qualified for the next round of competitions with secondary terminal box (1) are connected, insulating oil (11) are filled in hollow insulating sleeve (2) and the oil storage cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321555843.9U CN220381909U (en) | 2023-06-19 | 2023-06-19 | Explosion-proof oil-immersed current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321555843.9U CN220381909U (en) | 2023-06-19 | 2023-06-19 | Explosion-proof oil-immersed current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220381909U true CN220381909U (en) | 2024-01-23 |
Family
ID=89568912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321555843.9U Active CN220381909U (en) | 2023-06-19 | 2023-06-19 | Explosion-proof oil-immersed current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220381909U (en) |
-
2023
- 2023-06-19 CN CN202321555843.9U patent/CN220381909U/en active Active
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