CN107845496A - A kind of lightning protection transformer - Google Patents
A kind of lightning protection transformer Download PDFInfo
- Publication number
- CN107845496A CN107845496A CN201711113189.5A CN201711113189A CN107845496A CN 107845496 A CN107845496 A CN 107845496A CN 201711113189 A CN201711113189 A CN 201711113189A CN 107845496 A CN107845496 A CN 107845496A
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- Prior art keywords
- coiling
- lightning
- primary coil
- lightning protection
- secondary coil
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- 230000006698 induction Effects 0.000 claims abstract description 69
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 38
- 230000008054 signal transmission Effects 0.000 claims abstract description 4
- 238000000605 extraction Methods 0.000 claims description 11
- 239000011888 foil Substances 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000009413 insulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L1/00—Devices along the route controlled by interaction with the vehicle or train
- B61L1/20—Safety arrangements for preventing or indicating malfunction of the device, e.g. by leakage current, by lightning
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2823—Wires
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/288—Shielding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Train Traffic Observation, Control, And Security (AREA)
- Regulation Of General Use Transformers (AREA)
Abstract
The present invention relates to a kind of lightning protection transformer, is installed on the signal transmission passage of railroad track indoor equipment and outdoor equipment, including：Primary coil, secondary coil and ED shaped iron cores, wherein, the primary coil and secondary coil are wound on ED shaped iron cores center；Interior anti lightning induction sheath is enclosed in the primary coil first coiling one before coiling, coiling terminate after further around the outer anti lightning induction sheath of the circle of system one；The interior anti lightning induction sheath and outer anti lightning induction sheath are electrically connected and are grounded with the ED shaped iron cores.By technical scheme, can solve the problem that in the prior art due to the problem of transfer ratio of lightning protection transformer caused by lightning protection transformer self structure is low influences lightning protection effect.
Description
Technical field
The present invention relates to transformer technology field, and in particular to a kind of lightning protection transformer.
Background technology
Railway signal is used to on rail sending or receiving from rail control signal with track transformer.At present, railway
Signal is made up of with track transformer normal coil and iron core, coil during fabrication, primary coil and the equal coiling of secondary coil
Anti lightning device is not added with same coil rack, in coil.Due on thunder and lightning prone areas railway power system and rail
Easily disturbed by thunder and lightning, damage track transformer and miscellaneous equipment, have a strong impact on railway operation safety.
Digital signal cable communication port between high ferro ZPW-2000A track circuits outdoor equipment and indoor equipment is thunder
Main one of approach of releasing of electricity, if this is logical by stronger lightning impulse, frequently can lead to the hair of ZPW-2000A track circuits
Send the large area of device and receiver to damage, have a strong impact on the conevying efficiency of railway.Therefore, for the passage lightning protection very
It is necessary.
The R50 type lightning protection transformers that ZPW-2000A track circuit systems use at present, the shortcomings that R50 type lightning protection transformers
It is：Because R50 types transformer is low using R shaped iron cores, the transfer ratio of lightning protection transformer.Common mode Lightning disturbance track electricity
Road system, high potential over the ground is formed on the line, lightning protection transformer primary protection is exactly the high potential of this longitudinal direction over the ground,
Transfer ratio refers to the ratio between thunder and lightning input side high voltage and outlet side low-voltage, and transfer ratio is low to cause outlet side
Current potential is remained above in the horizontal magnitude of equipment insulation against ground, increases the danger of equipment insulation against ground breakdown.
The content of the invention
In view of this, it is an object of the invention to overcome the deficiencies of the prior art and provide a kind of lightning protection transformer, it is applied to
On high ferro ZPW-2000A track circuit transmission passages, to solve in the prior art due to caused by lightning protection transformer self structure
The transfer ratio of lightning protection transformer low the problem of influenceing lightning protection effect.
To realize object above, the present invention adopts the following technical scheme that：
A kind of lightning protection transformer, it is installed on the signal transmission passage of railroad track indoor equipment and outdoor equipment, including：
Primary coil, secondary coil and ED shaped iron cores, wherein,
The primary coil and secondary coil are wound on the center of ED shaped iron cores, ensure its transmission performance；The primary
Interior anti lightning induction sheath is enclosed in coil first coiling one before coiling, coiling terminate after further around the outer anti lightning induction shield of the circle of system one
Layer；The interior anti lightning induction sheath and outer anti lightning induction sheath are electrically connected and are grounded with the ED shaped iron cores.
Preferably, the center of the ED shaped iron cores is provided with skeleton, the secondary coil and primary coil successively successively around
Make on the skeleton；First interior anti lightning induction sheath, coiling knot are enclosed in coiling one to the primary coil on skeleton before coiling
Further around the outer anti lightning induction sheath of the circle of system one after beam.
Preferably, the secondary coil first coiling insulating tape on skeleton before coiling, coiling terminate after again in secondary
The outer coiling insulating tape of coil
Preferably, the primary coil is provided with the lead-out wire with indoor equipment electrical connection, is set on the secondary coil
There is the lead-out wire with outdoor equipment electrical connection.
Preferably, the head and end of the primary coil is drawn by homonymy, is electrically connected after extraction with the indoor equipment；
The head and end of the secondary coil is drawn by homonymy, is electrically connected after extraction with the outdoor equipment.
Preferably, the primary coil is identical with the number of plies of secondary coil, and around to identical.
Preferably, the line footpath of the primary coil be ф 0.53mm, the number of turn 150；The line footpath of the secondary coil is ф
0.53mm, the number of turn 156.
Preferably, the interior anti lightning induction sheath and outer anti lightning induction sheath are fully wrapped around by insulating materials
Metal foil is formed, and ground wire lead-out wire is connected with metal foil.
Preferably, the interior anti lightning induction sheath and outer anti lightning induction sheath thickness are all 0.1mm.
Preferably, the ground wire lead-out wire of the interior anti lightning induction sheath and outer anti lightning induction sheath is prevented with described
The earth terminal conducting of thunder transformer complete machine.
The present invention uses above technical scheme, at least possesses following beneficial effect：
As shown from the above technical solution, this lightning protection transformer provided by the invention, employs ED shaped iron cores, primary coil
The center of ED shaped iron cores is wound on secondary coil, interior anti lightning induction shield is enclosed in primary coil first coiling one before coiling
Layer, coiling terminate after further around the outer anti lightning induction sheath of the circle of system one, by changing transformer device structure, in guarantee transmission characteristic
On the basis of, the transfer ratio of transformer is improved, it is compared with prior art, stronger to the Decay Rate of thunder and lightning signal, improve lightning protection
Effect.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of scheme of installation for lightning protection transformer that one embodiment of the invention provides；
Fig. 2 is a kind of structural representation for lightning protection transformer that one embodiment of the invention provides.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, technical scheme will be carried out below
Detailed description.Obviously, described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are resulting on the premise of creative work is not made to be owned
Other embodiment, belong to the scope that the present invention is protected.
Below by drawings and examples, technical scheme is described in further detail.
Embodiment one,
Referring to Fig. 1, a kind of lightning protection transformer of the present embodiment offer, railroad track indoor equipment and outdoor equipment are installed on
Signal transmission passage on, including：Primary coil 1, secondary coil 2 and ED shaped iron cores 3, wherein,
The primary coil 1 and secondary coil 2 are wound on the center of ED shaped iron cores 3；The primary coil 1 is before coiling
Interior anti lightning induction sheath is enclosed in first coiling one, coiling terminate after further around the outer anti lightning induction sheath of the circle of system one；It is described interior anti-
Lightning induction screen layer and outer anti lightning induction sheath are electrically connected and are grounded with the ED shaped iron cores 3.
As shown from the above technical solution, this lightning protection transformer provided by the invention, employs ED shaped iron cores, primary coil
The center of ED shaped iron cores is wound on secondary coil, interior anti lightning induction shield is enclosed in primary coil first coiling one before coiling
Layer, coiling terminate after further around the outer anti lightning induction sheath of the circle of system one, by changing transformer device structure, in guarantee transmission characteristic
On the basis of, the transfer ratio of transformer is improved, it is compared with prior art, stronger to the Decay Rate of thunder and lightning signal, improve lightning protection
Effect.
Embodiment two,
A kind of lightning protection transformer that the present embodiment provides, the signal for being installed on railroad track indoor equipment and outdoor equipment pass
On defeated passage, including：Primary coil 1, secondary coil 2 and ED shaped iron cores 3, wherein,
The primary coil 1 and secondary coil 2 are wound on the center of ED shaped iron cores 3；The primary coil 1 is before coiling
Interior anti lightning induction sheath is enclosed in first coiling one, coiling terminate after further around the outer anti lightning induction sheath of the circle of system one；It is described interior anti-
Lightning induction screen layer and outer anti lightning induction sheath are electrically connected and are grounded with the ED shaped iron cores 3.
Preferably, the center of the ED shaped iron cores is provided with skeleton, the secondary coil and primary coil successively successively around
Make on the skeleton；First interior anti lightning induction sheath, coiling knot are enclosed in coiling one to the primary coil on skeleton before coiling
Further around the outer anti lightning induction sheath of the circle of system one after beam.
Preferably, the secondary coil first coiling insulating tape on skeleton before coiling, coiling terminate after again in secondary
The outer coiling insulating tape of coil.
As shown from the above technical solution, this lightning protection transformer that the present embodiment provides is more compared to embodiment one：ED
The center of shaped iron core is provided with skeleton, and primary coil and secondary coil are wound on central skeleton；Primary coil is before coiling
First interior anti lightning induction sheath is enclosed in coiling one on skeleton, and coiling is adopted after terminating further around the outer anti lightning induction sheath of the circle of system one
With ED shaped iron cores.
The present embodiment is to set skeleton in the center of ED shaped iron cores compared to the benefit of embodiment one, be easy to primary coil and
The coiling of secondary coil, according to requirement of engineering, it can disclosure satisfy that different working environments will with the coiling difference number of turn and the number of plies
Ask.
Embodiment three,
A kind of lightning protection transformer that the present embodiment provides, the signal for being installed on railroad track indoor equipment and outdoor equipment pass
On defeated passage, including：Primary coil 1, secondary coil 2 and ED shaped iron cores 3, wherein,
The primary coil 1 and secondary coil 2 are wound on the center of ED shaped iron cores 3；The primary coil 1 is first before coiling
Interior anti lightning induction sheath is enclosed in coiling one, coiling terminate after further around the outer anti lightning induction sheath of the circle of system one；The interior anti-thunder
Electric induction screen layer and outer anti lightning induction sheath are electrically connected and are grounded with the ED shaped iron cores 3.
Preferably, the center of the ED shaped iron cores is provided with skeleton, the secondary coil and primary coil successively successively around
Make on the skeleton；First interior anti lightning induction sheath, coiling knot are enclosed in coiling one to the primary coil on skeleton before coiling
Further around the outer anti lightning induction sheath of the circle of system one after beam.
Referring to Fig. 2, it is preferable that the primary coil 1 is provided with the lead-out wire 11 and 12 with indoor equipment electrical connection, institute
State secondary coil 2 and be provided with the lead-out wire 21 and 22 being electrically connected with outdoor equipment.
Preferably, the head and end of the primary coil is drawn by homonymy, is electrically connected after extraction with the indoor equipment；
The head and end of the secondary coil is drawn by homonymy, is electrically connected after extraction with the outdoor equipment.
As shown from the above technical solution, this lightning protection transformer that the present embodiment provides is more compared to embodiment two：Just
Level coil is provided with the lead-out wire with indoor equipment electrical connection, and secondary coil is provided with the extraction with outdoor equipment electrical connection
Line.
The present embodiment is compared to the benefit of embodiment two, due to the lead provided with connection indoor equipment and outdoor equipment, just
It is electrically connected, is mountable in railway track circuit in indoor equipment and outdoor equipment.
Example IV,
A kind of lightning protection transformer that the present embodiment provides, the signal for being installed on railroad track indoor equipment and outdoor equipment pass
On defeated passage, including：Primary coil 1, secondary coil 2 and ED shaped iron cores 3, wherein,
The primary coil 1 and secondary coil 2 are wound on the center of ED shaped iron cores 3；The primary coil 1 is before coiling
Interior anti lightning induction sheath is enclosed in first coiling one, coiling terminate after further around the outer anti lightning induction sheath of the circle of system one；It is described interior anti-
Lightning induction screen layer and outer anti lightning induction sheath are electrically connected and are grounded with the ED shaped iron cores 3.
Preferably, the central skeleton of the ED shaped iron cores, the secondary coil and primary coil are successively described in priority coiling
On skeleton；First interior anti lightning induction sheath is enclosed in coiling one to the primary coil on skeleton before coiling, coiling terminate after again
Outer anti lightning induction sheath is enclosed in coiling one.
Preferably, the primary coil is provided with the lead-out wire with indoor equipment electrical connection, is set on the secondary coil
There is the lead-out wire with outdoor equipment electrical connection.
Preferably, the head and end of the primary coil is drawn by homonymy, is electrically connected after extraction with the indoor equipment；
The head and end of the secondary coil is drawn by homonymy, is electrically connected after extraction with the outdoor equipment.
Preferably, the primary coil is identical with the number of plies of secondary coil, and around to identical.
Preferably, the line footpath of the primary coil be ф 0.53mm, the number of turn 150；The line footpath of the secondary coil is ф
0.53mm, the number of turn 156.
As shown from the above technical solution, this lightning protection transformer that the present embodiment provides is more compared to embodiment three：Just
The line footpath of level coil is ф 0.53mm, the number of turn 150；The line footpath of secondary coil is ф 0.53mm, the number of turn 156.So set
Benefit be that can further improve the lightning protection effect of this lightning protection transformer provided by the invention.
Embodiment five,
A kind of lightning protection transformer that the present embodiment provides, the signal for being installed on railroad track indoor equipment and outdoor equipment pass
On defeated passage, including：Primary coil 1, secondary coil 2 and ED shaped iron cores 3, wherein,
The primary coil 1 and secondary coil 2 are wound on the center of ED shaped iron cores 3；The primary coil 1 is before coiling
Interior anti lightning induction sheath is enclosed in first coiling one, coiling terminate after further around the outer anti lightning induction sheath of the circle of system one；It is described interior anti-
Lightning induction screen layer and outer anti lightning induction sheath are electrically connected and are grounded with the ED shaped iron cores 3.
Preferably, the center of the ED shaped iron cores 3 is provided with skeleton, the secondary coil and primary coil successively successively around
Make on the skeleton；First interior anti lightning induction sheath, coiling knot are enclosed in coiling one to the primary coil on skeleton before coiling
Further around the outer anti lightning induction sheath of the circle of system one after beam.
Preferably, the primary coil is provided with the lead-out wire with indoor equipment electrical connection, is set on the secondary coil
There is the lead-out wire with outdoor equipment electrical connection.
Preferably, the head and end of the primary coil is drawn by homonymy, is electrically connected after extraction with the indoor equipment；
The head and end of the secondary coil is drawn by homonymy, is electrically connected after extraction with the outdoor equipment.
Preferably, the primary coil is identical with the number of plies of secondary coil, and around to identical.
Preferably, the line footpath of the primary coil be ф 0.53mm, the number of turn 150；The line footpath of the secondary coil is ф
0.53mm, the number of turn 156.
Referring to Fig. 2, it is preferable that the interior anti lightning induction sheath and outer anti lightning induction sheath are complete by insulating materials
The metal foil wrapped up entirely is formed, and ground wire lead-out wire 13 is connected with metal foil.
Preferably, the interior anti lightning induction sheath and outer anti lightning induction sheath thickness are all 0.1mm.
Preferably, the ground wire lead-out wire of the interior anti lightning induction sheath and outer anti lightning induction sheath is prevented with described
The earth terminal conducting of thunder transformer complete machine.
As shown from the above technical solution, this lightning protection transformer that the present embodiment provides is more compared to example IV：It is interior
The structure setting of anti lightning induction sheath and outer anti lightning induction sheath, the benefit so set are further to carry
The lightning protection effect of high this lightning protection transformer provided by the invention.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance.Term " multiple " refers to
Two or more, limit unless otherwise clear and definite.
Claims (10)
1. a kind of lightning protection transformer, it is installed on the signal transmission passage of railroad track indoor equipment and outdoor equipment, its feature
It is, including：Primary coil, secondary coil and ED shaped iron cores, wherein,
The primary coil and secondary coil are wound on the center of ED shaped iron cores；The primary coil first coiling one before coiling
Anti lightning induction sheath in circle, coiling terminate after further around the outer anti lightning induction sheath of the circle of system one；The interior anti lightning sensing
Screen layer and outer anti lightning induction sheath are electrically connected and are grounded with the ED shaped iron cores.
2. lightning protection transformer according to claim 1, it is characterised in that the center of the ED shaped iron cores is provided with skeleton,
The secondary coil and primary coil are successively described in priority coiling on skeleton；The primary coil before coiling first on skeleton around
Anti lightning induction sheath in the circle of system one, coiling terminate after further around the outer anti lightning induction sheath of the circle of system one.
3. lightning protection transformer according to claim 2, it is characterised in that the secondary coil is before coiling first on skeleton
Coiling insulating tape, the coiling insulating tape outside secondary coil again after coiling terminates.
4. lightning protection transformer according to claim 1, it is characterised in that the primary coil is provided with and indoor equipment electricity
The lead-out wire of gas connection, the secondary coil are provided with the lead-out wire with outdoor equipment electrical connection.
5. lightning protection transformer according to claim 4, it is characterised in that the head and end of the primary coil is drawn by homonymy
Go out, be electrically connected after extraction with the indoor equipment；The head and end of the secondary coil is drawn by homonymy, after extraction with it is described
Outdoor equipment is electrically connected.
6. lightning protection transformer according to claim 1, it is characterised in that the number of plies phase of the primary coil and secondary coil
Together, and around to identical.
7. lightning protection transformer according to claim 1, it is characterised in that the line footpath of the primary coil be ф 0.53mm,
The number of turn is 150；The line footpath of the secondary coil is ф 0.53mm, the number of turn 156.
8. lightning protection transformer according to claim 1, it is characterised in that the interior anti lightning induction sheath and outer anti-thunder
Electric induction screen layer is made up of the fully wrapped around metal foil of insulating materials, and ground wire lead-out wire is connected with metal foil.
9. lightning protection transformer according to claim 8, it is characterised in that the interior anti lightning induction sheath and outer anti-thunder
Electric induction shielding thickness is all 0.1mm.
10. lightning protection transformer according to claim 8, it is characterised in that the interior anti lightning induction sheath and outer anti-
The ground wire lead-out wire of lightning induction screen layer turns on the earth terminal of the lightning protection transformer complete machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711113189.5A CN107845496B (en) | 2017-11-13 | 2017-11-13 | Lightning protection transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711113189.5A CN107845496B (en) | 2017-11-13 | 2017-11-13 | Lightning protection transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107845496A true CN107845496A (en) | 2018-03-27 |
| CN107845496B CN107845496B (en) | 2020-06-26 |
Family
ID=61681838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711113189.5A Active CN107845496B (en) | 2017-11-13 | 2017-11-13 | Lightning protection transformer |
Country Status (1)
| Country | Link |
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| CN (1) | CN107845496B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2243117Y (en) * | 1995-04-07 | 1996-12-18 | 中国铁路通信信号总公司西安器材研究所 | Anti-thunder transformer |
| CN1909313A (en) * | 2006-08-11 | 2007-02-07 | 上海铁大电信设备有限公司 | Integrated thunder protecting device for railway signal micro-electron equipment |
| CN204794062U (en) * | 2015-07-31 | 2015-11-18 | 沈阳铁路信号有限责任公司 | Lightning protection analog network dish that uses is moved to naked among frequency track circuit |
-
2017
- 2017-11-13 CN CN201711113189.5A patent/CN107845496B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2243117Y (en) * | 1995-04-07 | 1996-12-18 | 中国铁路通信信号总公司西安器材研究所 | Anti-thunder transformer |
| CN1909313A (en) * | 2006-08-11 | 2007-02-07 | 上海铁大电信设备有限公司 | Integrated thunder protecting device for railway signal micro-electron equipment |
| CN204794062U (en) * | 2015-07-31 | 2015-11-18 | 沈阳铁路信号有限责任公司 | Lightning protection analog network dish that uses is moved to naked among frequency track circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107845496B (en) | 2020-06-26 |
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