CN111508687B - Traction transformer protection device - Google Patents
Traction transformer protection device Download PDFInfo
- Publication number
- CN111508687B CN111508687B CN202010441080.XA CN202010441080A CN111508687B CN 111508687 B CN111508687 B CN 111508687B CN 202010441080 A CN202010441080 A CN 202010441080A CN 111508687 B CN111508687 B CN 111508687B
- Authority
- CN
- China
- Prior art keywords
- copper bar
- shell
- inner cavity
- breaking
- epoxy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229910052802 copper Inorganic materials 0.000 claims abstract description 100
- 239000010949 copper Substances 0.000 claims abstract description 100
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 99
- 239000002360 explosive Substances 0.000 claims abstract description 28
- 230000005284 excitation Effects 0.000 claims abstract description 27
- 230000000977 initiatory effect Effects 0.000 claims abstract description 27
- 238000002955 isolation Methods 0.000 claims abstract description 10
- 239000004593 Epoxy Substances 0.000 claims description 43
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 11
- 229910052709 silver Inorganic materials 0.000 claims description 11
- 239000004332 silver Substances 0.000 claims description 11
- 210000004907 gland Anatomy 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 241001391944 Commicarpus scandens Species 0.000 claims 2
- 238000004804 winding Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 210000001503 joint Anatomy 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/02—Casings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Fuses (AREA)
Abstract
The invention provides a traction transformer protection device, comprising: an external excitation connector for receiving an external excitation signal; an isolation pulse transformer connected to the external excitation connector; the high-speed breaker comprises a shell with an inner cavity, an upper copper bar, a lower copper bar, and an initiating explosive device, an opening grid sheet and a breaking sheet which are sequentially arranged in the inner cavity from top to bottom, wherein one ends of the upper copper bar and the lower copper bar extend into the inner cavity, the other ends extend out of the shell, one ends of the upper copper bar and the lower copper bar extending into the inner cavity are connected through the breaking sheet, a rubber ring is arranged on the inner wall of the part of the inner cavity below the breaking sheet, and the initiating explosive device is connected with an isolation pulse transformer; an arc-extinguishing fuse connected in parallel with the high-speed breaker, the arc-extinguishing fuse having an indicator and auxiliary contacts for feeding back the operating state of the traction transformer protection device. The invention has the beneficial effects that: the direct current is prevented from passing through, and the primary winding of the traction transformer is prevented from being burnt out by the direct current overheat after long-time passing.
Description
Technical Field
The invention relates to the technical field of circuit protection equipment, in particular to a traction transformer protection device.
Background
The traction transformer protection device is applied to an alternating-current high-voltage system and is positioned at the lower end of the traction transformer. When the external power grid is ready to be switched into direct current, the change-over switch should be communicated to the direct current side position first, the alternating current loop is disconnected, and the primary winding of the traction transformer can not be electrified. However, if the change-over switch fails to switch to the dc side due to an abnormality, and is connected to the traction transformer on the ac side, the primary winding of the traction transformer is overheated and burned out by a long-time direct current.
Disclosure of Invention
In view of this, embodiments of the present invention provide a traction transformer protection device that can be energized with normal ac load current, as well as with short-term surge currents that occur during start-up and shut-down. But also can rapidly break the direct current load current under the control of external excitation.
An embodiment of the present invention provides a traction transformer protection device including:
An external excitation connector for receiving an external excitation signal;
an isolation pulse transformer connected to the external excitation connector;
The high-speed breaker comprises a shell with an inner cavity, an upper copper bar, a lower copper bar, and an initiating explosive device, a breaking grid sheet and a frangible sheet which are sequentially arranged in the inner cavity from top to bottom, wherein the uniform ends of the upper copper bar and the lower copper bar extend into the inner cavity, the other ends of the upper copper bar and the lower copper bar extend out of the shell, one ends of the upper copper bar and the lower copper bar extend into the inner cavity and are connected through the frangible sheet, one ends of the upper copper bar and the lower copper bar, which are positioned outside the shell, are used for being connected into a main circuit in series, and a rubber ring is arranged on the inner wall of the inner cavity, which is positioned below the frangible sheet, and the initiating explosive device is connected with the isolating pulse transformer;
And the isolating pulse transformer is used for responding to the excitation signal and triggering the initiating explosive device, the initiating explosive device is used for driving the breaking grid sheet to move downwards until the breaking grid sheet is extruded and fastened by the rubber ring, the breaking grid sheet is used for cutting off the frangible sheet to disconnect the upper copper bar from the lower copper bar, and the current between the upper copper bar and the lower copper bar is transferred to the arc-extinguishing fuse, and the arc-extinguishing fuse cuts off the main circuit through current fusing.
Further, the upper copper bar is a Z-shaped copper bar, the lower copper bar is an inverted T-shaped copper bar, one end of the upper copper bar transversely penetrates through the inner cavity, a breaking hole is formed in the portion, penetrating through the inner cavity, of the upper copper bar, the breaking piece is arranged right below the breaking hole, the edge of the breaking hole is in contact connection with the edge of the breaking piece, and the middle portion of the lower copper bar is inserted into the inner cavity and extends to the position, where the breaking piece is in contact connection with the inner cavity.
Further, the middle part of the lower copper bar is a copper column, the breaking grid sheet is of a sleeve structure with an opening at the lower end, and the diameter of the copper column is smaller than the inner diameter of the breaking grid sheet.
Further, the top of easy broken piece is equipped with the epoxy ring, the below of easy broken piece is equipped with the epoxy circle, the epoxy ring with the epoxy circle is all embedded the inner chamber inner wall, just the epoxy is encircleed outward the broken bars piece, the epoxy circle is encircleed the copper post.
Further, the shell comprises a gland, an upper shell and a lower shell, wherein cavities penetrating up and down are formed in the middle of the upper shell and the lower shell, the upper end of the upper shell is connected with the gland, the lower end of the upper shell is connected with the upper end of the lower shell, and one end of the upper copper bar is arranged between the upper shell and the lower shell and clamped by the upper shell and the lower shell.
Further, be equipped with from top to bottom in proper order the bush, epoxy endotheca, steel ring with the epoxy ring is equipped with in the cavity of last casing, the bush the epoxy endotheca the steel ring with the epoxy ring encircles the gate piece sets up that breaks, initiating explosive device set up in the top of the inner chamber of last casing, the initiating explosive device upper end extends out the gland and connects keep apart pulse transformer, lower extreme run through and stretch into the bush, be equipped with the piston in the bush, the piston upper end with initiating explosive device lower extreme butt, lower extreme with gate piece butt breaks.
Further, the epoxy ring and the rubber ring are arranged in the cavity of the lower shell, the epoxy ring is arranged on the upper portion of the cavity of the lower shell and is in contact with the edge of the frangible piece, the rubber ring is arranged below the epoxy ring, and the epoxy ring and the rubber ring are all arranged around the copper column.
Further, the breakable pieces are round silver pieces, and a plurality of breakable holes evenly distributed around the circle center of the round silver pieces are arranged in the middle of the round silver pieces.
Further, the frangible holes are isosceles triangles, and the middle branching lines of the frangible holes coincide with the diameters of the round silver plates.
Further, the arc extinguishing fuse has an indicator and an auxiliary contact, the auxiliary contact being connected to the indicator.
The technical scheme provided by the embodiment of the invention has the beneficial effects that: when the main circuit passes through alternating current, the current directly flows through the high-speed breaker, the arc extinguishing fuse is bypassed, and the protection device is only used as a through-flow component and can bear specific surge current impact in an alternating current power grid without damage; when the main circuit passes through direct current, the pulse transformer is isolated under the action of an excitation signal to trigger an initiating explosive device, the current between the upper copper bar and the lower copper bar is cut off, the current between the upper copper bar and the lower copper bar is transferred to the arc-extinguishing fuse, the arc-extinguishing fuse fuses the direct current on the main circuit by fusing, the direct current is prevented from passing, and the primary winding of the traction transformer is prevented from being burnt out due to the long-time direct current.
Drawings
FIG. 1 is a schematic diagram of a traction transformer protection device of the present invention;
fig. 2 is a front view of the high-speed interrupter 3 and the arc extinguishing fuse 4 of fig. 1;
Fig. 3 is a top view of the high-speed circuit breaker 3 and the arc-extinguishing fuse 4 of fig. 1;
fig. 4 is a left side view of the high-speed breaker 3 and the arc extinguishing fuse 4 of fig. 1;
fig. 5 is a top view of the high-speed circuit breaker 3 of fig. 1;
FIG. 6 is a schematic cross-sectional view of A-A of FIG. 5;
Fig. 7 is a schematic view of the frangible tab 10 of fig. 6.
In the figure: 1-external excitation connector, 2-isolation pulse transformer, 3-high-speed breaker, 4-arc extinguishing fuse, 5-gland, 6-upper shell, 7-lower shell, 8-initiating explosive device, 9-breaking grid piece, 10-frangible piece, 11-upper copper bar, 12-lower copper bar, 13-copper column, 14-rubber ring, 15-piston, 16-inner bushing, 17-epoxy inner bushing, 18-steel ring, 19-epoxy ring, 20-epoxy ring, 21-inner cavity, 22-screw, 23-frangible hole.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1,2, 3 and 4, an embodiment of the present invention provides a traction transformer protection device, including: an external excitation connector 1, an isolation pulse transformer 2, a high-speed breaker 3 and an arc-extinguishing fuse 4.
Specifically, the external excitation connector 1 is configured to receive an external excitation signal, where the external excitation signal is sent out externally when a circuit is abnormal, that is, when a direct current is input to a primary side of a traction transformer in a high-voltage system. When the protection device is applied to a high-voltage system of an electric automobile, the excitation signal is sent out by a vehicle-mounted control system.
The isolation pulse transformer 2 is connected with the external excitation connector 1, and the isolation pulse transformer 2 triggers the high-speed breaker 3 after receiving the excitation signal.
Referring to fig. 5 and 6, the high-speed breaker 3 includes a housing having an inner cavity 21, an upper copper bar 11, a lower copper bar 12, and an initiating explosive device 8, a breaking grid 9 and a frangible sheet 10 sequentially disposed in the inner cavity 21 from top to bottom, wherein uniform ends of the upper copper bar 11 and the lower copper bar 12 extend into the inner cavity 21, the other ends extend out of the housing, one ends of the upper copper bar 11 and the lower copper bar 12 extending into the inner cavity 21 are connected through the frangible sheet 10, one ends of the upper copper bar 11 and the lower copper bar 12 located outside the housing are used for being connected in series to a main circuit, and an inner wall of the inner cavity 21 located at a lower portion of the frangible sheet 10 is provided with a rubber ring 14, and the initiating explosive device 8 is connected with the isolating pulse transformer 2.
In this embodiment, the casing includes gland 5, upper casing 6 and lower casing 7, upper casing 6 with lower casing 7 all middle part is equipped with the cavity that runs through from top to bottom, upper casing 6 upper end is connected gland 5, lower extreme is connected lower casing 7 upper end, upper casing 6 with the cavity of lower casing 7 merges and forms the inner chamber 21 of casing. Here, the gland 5 is provided with a plurality of screws 22, and the screws 22 are connected to the upper end of the upper housing 6, so that the upper end of the upper housing 6 is sealed.
The upper copper bar 11 is a Z-shaped copper bar, the lower copper bar 12 is an inverted T-shaped copper bar, one end of the upper copper bar 11 traverses the inner cavity 21, and a part of the upper copper bar 12 penetrating through the inner cavity 21 is provided with a breaking hole. Here, one end of the upper copper bar 11 is placed between the upper case 6 and the lower case 7 and clamped by both, and the breaking hole is penetrated by the inner cavity 21. The middle part of lower copper bar 7 is copper post 13, copper post 13 inserts the lower part of lower casing 7's cavity, just lower copper bar 12 with the lower extreme of lower casing 7 passes through screw 22 fastening, lower copper bar 12 seals the lower extreme of lower casing 7.
An inner lining 16, an epoxy inner sleeve 17, a steel ring 18 and an epoxy ring 19 which are sequentially abutted from top to bottom are arranged in the cavity of the upper shell 6, the inner lining 16, the epoxy inner sleeve 17, the steel ring and the epoxy ring 18 are arranged around the breaking grid sheet 9, and the outer walls of the inner lining 16, the epoxy inner sleeve 17, the steel ring 18 and the epoxy ring 19 are adhered and fixed with the inner wall of the cavity of the upper shell 6. The initiating explosive device 8 is arranged at the top of the inner cavity of the upper shell 6, the upper end of the initiating explosive device 8 extends out of the gland 5 and is connected with the isolating pulse transformer 2, the lower end of the initiating explosive device extends into the inner bushing 16 in a penetrating mode, a piston 15 is arranged in the inner bushing 16, and the upper end of the piston 15 is in butt joint with the lower end of the initiating explosive device 8, and the lower end of the piston 15 is in butt joint with the breaking grid 9. Here, the breaking grating 9 is a sleeve structure with an opening at the lower end, and the diameter of the copper pillar 13 is smaller than the inner diameter of the breaking grating 9.
The breaking plate 10 is arranged right below the breaking hole, the edge of the breaking hole is in contact connection with the edge of the breaking plate 10, and the lower end of the breaking grid plate 9 is aligned with the breaking plate 10. The copper column 13 in the middle of the lower copper bar 12 is inserted into the cavity of the lower shell 7 and extends to the point that the frangible piece 10 is in contact connection with the same.
Referring to fig. 7, in order to ensure that the frangible sheet 10 has good electrical conductivity and breaking function, the frangible sheet 10 is a circular silver sheet, and a plurality of frangible holes 23 uniformly distributed around the center of the circular silver sheet are provided in the middle of the circular silver sheet. Here, the frangible holes 23 are isosceles triangles, the middle line of the frangible holes 23 coincides with the diameter of the frangible sheet 10, and all the frangible holes 23 are surrounded to form a circle, and the circle is aligned with the lower end of the breaking grid 9.
The below of easy broken piece 10 is equipped with epoxy circle 20, epoxy circle 20 with rubber circle 14 set up in the cavity of lower casing 7, epoxy circle 20 set up in the upper portion of the cavity of lower casing 7 and with the edge contact of easy broken piece 10, rubber circle 14 set up in the below of epoxy circle 20, epoxy circle 20 with rubber circle 14 all encircles copper post 13 sets up. The axes of the epoxy ring 20, the rubber ring 14, the copper column 13 and the breaking grid 9 are overlapped.
The arc-extinguishing fuse 4 is connected with the high-speed breaker 3 in parallel, and the arc-extinguishing fuse 4 can automatically fuse under the action of current. In this embodiment, the arc extinguishing fuse 3 has an indicator and an auxiliary contact, the auxiliary contact is connected with the indicator, and the indicator reflects the breaking of the arc extinguishing fuse 3, i.e. is used for feeding back the working state of the traction transformer protection device.
The working principle of the traction transformer protection device of the invention is as follows: and connecting the upper copper bar 11 and the lower copper bar 12 in series to a main circuit at the lower end of the traction transformer, and connecting the external excitation connector 1 to an external control system. When the main circuit passes through alternating current, the current directly flows between the upper copper bar 11 and the lower copper bar 12 in the high-speed breaker 3, the arc extinguishing fuse 4 is bypassed without current, and the whole traction transformer protection device is used as a through-flow component and can bear specific surge current impact in an alternating current power grid without damage. When the main circuit passes through direct current, an external control system sends an excitation signal to the external excitation connector 1, the external excitation connector 1 processes the excitation signal and transmits the excitation signal to the isolation pulse transformer 2, so that the isolation pulse transformer 2 triggers the initiating explosive device 8, the initiating explosive device 8 pushes the piston 15 to move downwards, the piston 15 pushes the breaking grid 9 to move downwards, the breaking grid 10 is cut off until the breaking grid moves into a cavity of the lower shell 7, at the moment, the outer wall of the breaking grid 9 is extruded and fixed by the rubber ring 14, the direct current between the upper copper bar 11 and the lower copper bar 12 is cut off, then the current between the upper copper bar 11 and the lower copper bar 12 is transferred to the arc-extinguishing fuse 4, and the fuse 4 automatically fuses to break the direct current on the main circuit, so that the primary winding of the traction transformer is not burnt due to long-term direct current overheat.
In this document, terms such as front, rear, upper, lower, etc. are defined with respect to the positions of the components in the drawings and with respect to each other, for clarity and convenience in expressing the technical solution. It should be understood that the use of such orientation terms should not limit the scope of the claimed application.
The embodiments described above and features of the embodiments herein may be combined with each other without conflict.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A traction transformer protection device, comprising:
An external excitation connector for receiving an external excitation signal;
an isolation pulse transformer connected to the external excitation connector;
The high-speed breaker comprises a shell with an inner cavity, an upper copper bar, a lower copper bar, and an initiating explosive device, a breaking grid sheet and a frangible sheet which are sequentially arranged in the inner cavity from top to bottom, wherein the uniform ends of the upper copper bar and the lower copper bar extend into the inner cavity, the other ends of the upper copper bar and the lower copper bar extend out of the shell, one ends of the upper copper bar and the lower copper bar extend into the inner cavity and are connected through the frangible sheet, one ends of the upper copper bar and the lower copper bar, which are positioned outside the shell, are used for being connected into a main circuit in series, and a rubber ring is arranged on the inner wall of the inner cavity, which is positioned below the frangible sheet, and the initiating explosive device is connected with the isolating pulse transformer;
And the isolating pulse transformer is used for responding to the excitation signal and triggering the initiating explosive device, the initiating explosive device is used for driving the breaking grid sheet to move downwards until the breaking grid sheet is extruded and fastened by the rubber ring, the breaking grid sheet is used for cutting off the frangible sheet to disconnect the upper copper bar from the lower copper bar, and the current between the upper copper bar and the lower copper bar is transferred to the arc-extinguishing fuse, and the arc-extinguishing fuse cuts off the main circuit through current fusing.
2. A traction transformer protection device as defined in claim 1, wherein: the upper copper bar is a Z-shaped copper bar, the lower copper bar is an inverted T-shaped copper bar, one end of the upper copper bar transversely penetrates through the inner cavity, a breaking hole is formed in the portion, penetrating through the inner cavity, of the upper copper bar, the breaking piece is arranged right below the breaking hole, the edge of the breaking hole is in contact connection with the edge of the breaking piece, and the middle portion of the lower copper bar is inserted into the inner cavity and extends to the position, where the breaking piece is in contact connection with the inner cavity.
3. A traction transformer protection device as defined in claim 2, wherein: the middle part of lower copper bar is the copper post, the gate piece that breaks is lower extreme open-ended sleeve structure, the copper post diameter be less than with the internal diameter of gate piece that breaks.
4. A traction transformer protection device as claimed in claim 3, wherein: the top of easy broken piece is equipped with the epoxy ring, the below of easy broken piece is equipped with the epoxy circle, the epoxy ring with the epoxy circle is all embedded the inner chamber inner wall, just the epoxy ring is outside around the broken bars piece, the epoxy circle is around the copper post.
5. A traction transformer protection device as defined in claim 4, wherein: the shell comprises a gland, an upper shell and a lower shell, wherein cavities penetrating up and down are formed in the middle of the upper shell and the lower shell, the upper end of the upper shell is connected with the gland, the lower end of the upper shell is connected with the upper end of the lower shell, and one end of the upper copper bar is arranged between the upper shell and the lower shell and clamped by the upper shell and the lower shell.
6. A traction transformer protection device as defined in claim 5, wherein: the inner lining, the epoxy inner sleeve, the steel ring and the epoxy ring which are sequentially abutted from top to bottom are arranged in the cavity of the upper shell, the inner lining, the epoxy inner sleeve, the steel ring and the epoxy ring encircle the breaking grid sheet, an initiating explosive device is arranged at the top of the inner cavity of the upper shell, the upper end of the initiating explosive device extends out of the gland and is connected with the isolating pulse transformer, the lower end of the initiating explosive device penetrates through and extends into the inner lining, a piston is arranged in the inner lining, and the upper end of the piston is abutted with the lower end of the initiating explosive device and the lower end of the initiating explosive device is abutted with the breaking grid sheet.
7. A traction transformer protection device as defined in claim 6, wherein: the epoxy ring with the rubber ring set up in the cavity of lower casing, the epoxy ring set up in the upper portion of the cavity of lower casing and with the edge contact of breakable piece, the rubber ring set up in the below of epoxy ring, the epoxy ring with the rubber ring all encircles the copper post sets up.
8. A traction transformer protection device as defined in claim 1, wherein: the easy-to-break piece is a round silver piece, and a plurality of easy-to-break holes which are evenly distributed around the circle center of the round silver piece are arranged in the middle of the round silver piece.
9. A traction transformer protection device as defined in claim 8, wherein: the easy broken hole is isosceles triangle, and the middle branching line of the easy broken hole coincides with the diameter of the round silver sheet.
10. A traction transformer protection device as defined in claim 1, wherein: the arc suppressing fuse has an indicator and an auxiliary contact connected to the indicator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010441080.XA CN111508687B (en) | 2020-05-22 | 2020-05-22 | Traction transformer protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010441080.XA CN111508687B (en) | 2020-05-22 | 2020-05-22 | Traction transformer protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111508687A CN111508687A (en) | 2020-08-07 |
| CN111508687B true CN111508687B (en) | 2024-09-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010441080.XA Active CN111508687B (en) | 2020-05-22 | 2020-05-22 | Traction transformer protection device |
Country Status (1)
| Country | Link |
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| CN (1) | CN111508687B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212010608U (en) * | 2020-05-22 | 2020-11-24 | 武汉司德宝电气有限公司 | Traction transformer protection device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201616652U (en) * | 2010-01-27 | 2010-10-27 | 安徽巨森电器有限公司 | Large-capacity high-speed cut-off device |
| CN203839326U (en) * | 2014-05-07 | 2014-09-17 | 厦门赛尔特电子有限公司 | High-voltage direct-current temperature fuse |
| CN208077771U (en) * | 2018-01-16 | 2018-11-09 | 中铁二院工程集团有限责任公司 | A kind of combined transformer used applied to electric railway |
| CN208444797U (en) * | 2018-07-26 | 2019-01-29 | 武汉黎赛科技有限责任公司 | High-voltage and current-limitation device and electric locomotive high-voltage and current-limitation device |
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2020
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212010608U (en) * | 2020-05-22 | 2020-11-24 | 武汉司德宝电气有限公司 | Traction transformer protection device |
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| CN111508687A (en) | 2020-08-07 |
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