CN203674710U - Intelligent lightning-protection RS-485 wiring instrument - Google Patents
Intelligent lightning-protection RS-485 wiring instrument Download PDFInfo
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- CN203674710U CN203674710U CN201320800750.8U CN201320800750U CN203674710U CN 203674710 U CN203674710 U CN 203674710U CN 201320800750 U CN201320800750 U CN 201320800750U CN 203674710 U CN203674710 U CN 203674710U
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- intelligent terminal
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- tbu
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Abstract
An intelligent lightning-protection RS-485 wiring instrument belongs to the technical field of wiring instruments. The instrument comprises an intelligent terminal and RS-485 data lines. A ceramic discharge tube, a TVS transient diode and an opto-isolator are parallelly connected between the RS-485 data lines and the intelligent terminal, current-limiting resistors and TBU blockers are connected in series between the RS-485 data lines and the intelligent terminal. When a surge flows in from a phase A or a phase B of the RS-485 data lines, a certain amount of energy is released by the ceramic discharge tube, and common mode protection of the above circuit is achieved. Then through current limiting by the current-limiting resistors I and II, the surge current is lowered, and secondary induced currents are reduced. When the surge reaches the TBU blockers, the TBU blockers take instant actions and stop the surge from moving forward. A small residual current undergoes common mode protection by the TVS transient diode, and the voltage generated on the opto-isolator cannot be transmitted to the intelligent terminal. Therefore, the intelligent terminal is protected, damage caused by lightning strikes is reduced, and normal signal transmission is ensured.
Description
Technical field
The utility model belongs to wiring device technical field, is specifically related to a kind of for the intelligent lightning protecting RS-485 wiring device that can effectively prevent the interference such as direct lightning strike, induction thunder and surge on RS-485 data signal line.
Background technology
Along with RS-485 data-signal technology is widely used, the interference such as direct lightning strike, induction thunder and surge have become the problem that RS-485 data signal line often runs at Practical Project.The system that thunder and lightning can make RS-485 communication bus form is suffered serious breaking-up, and the surge of power generation disturbs the data transmission quality that also seriously affects RS-485 communication bus.In addition, because earth connection is not all installed in the electricity consumption of a lot of rural areas and remote mountain areas, and the multiple district of thunder and lightning is very most of and these region overlappings, some intelligent monitoring terminal installation site is distant from earth connection, there is certain difficulty of construction in wiring, if all independent groundings of each intelligent monitoring terminal can make because earth resistance is different again each earth point electromotive force difference, and make between two intelligent monitoring terminals to produce loop current, affect signal transmission.Design one can anti-induction thunder and jamproof RS-485 data signal line intelligent lightning protecting protection system for this reason.
Utility model content
For the above-mentioned problems in the prior art, it is a kind of for the intelligent lightning protecting RS-485 wiring device that can effectively prevent the interference such as direct lightning strike, induction thunder and surge on RS-485 data signal line that the purpose of this utility model is to provide.
Described a kind of intelligent lightning protecting RS-485 wiring device, comprise intelligent terminal and connected RS-485 data wire, it is characterized in that RS-485 data wire and intelligent terminal) between ceramic discharge tube, TVS transition diode and the photoisolator in parallel with intelligent terminal is set, current-limiting resistance and the TBU block device that setting is connected with intelligent terminal between intelligent terminal is set between RS-485 data wire and intelligent terminal.
Described a kind of intelligent lightning protecting RS-485 wiring device, is characterized in that described current-limiting resistance comprises the current-limiting resistance I and the current-limiting resistance II that are connected in series with intelligent terminal, and TBU block device comprises the block device I and the block device II that are connected in series with intelligent terminal.
Described a kind of intelligent lightning protecting RS-485 wiring device, between current-limiting resistance I described in it is characterized in that, the A phase and intelligent terminal that block device I is all arranged on RS-485 data wire, between described block device II, the B phase and intelligent terminal that current-limiting resistance II is all arranged on RS-485 data wire.
The utility model is by adopting above-mentioned technology, ceramic discharge tube on difference or serial or parallel connection between RS-485 data wire and intelligent terminal, current-limiting resistance, TBU block device, the lightning protection components and parts such as TVS transition diode and photoisolator, when surge fashionable according to legend from A phase or the B of RS-485 data wire, through ceramic discharge tube, discharge certain energy, and circuit is played to common mode protective action, pass through again current-limiting resistance I and current-limiting resistance II current limliting, surge current is reduced, reduce secondary faradic generation, in the time that surge arrives TBU block device, TBU block device snap action, block advancing of surge, and remaining Weak current is through the common mode protection of TVS transition diode, the voltage producing on photoisolator just cannot be transferred to intelligent terminal, thereby protect intelligent terminal, reduce the loss that thunderbolt causes, guarantee signal energy normal transmission.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation.
In figure: 1-RS-485 data wire, 2-ceramic discharge tube, 3-current-limiting resistance I, 4-block device I, 5-TVS transition diode, 6-photoisolator, 7-intelligent terminal, 8-block device II, 9-current-limiting resistance II.
Embodiment
Below in conjunction with Figure of description, the utility model will be further described, but protection range of the present utility model is not limited in this:
As shown in Figure 1, a kind of intelligent lightning protecting RS-485 wiring device, comprise intelligent terminal 7 and connected RS-485 data wire 1, RS-485 data wire 1 comprises A phase and the B phase of RS-485 data wire, be connected with the two ends of intelligent terminal 7 respectively, the utility model is in order to reach in the situation that no ground line exists, the destruction that lightning surge is caused drops to minimum object, the ceramic discharge tube 2 in parallel with intelligent terminal 7 is set between RS-485 data wire 1 and intelligent terminal 7, TVS transition diode 5 and photoisolator 6, between RS-485 data wire 1 and intelligent terminal 7, arrange current-limiting resistance and the TBU block device of connecting with intelligent terminal 7 are set between intelligent terminal 7, described current-limiting resistance comprises the current-limiting resistance I 3 and the current-limiting resistance II 9 that are connected in series with intelligent terminal 7, TBU block device comprises the block device I 4 and the block device II 8 that are connected in series with intelligent terminal 7, described current-limiting resistance I 3, block device I 4 is all arranged between the A phase and intelligent terminal 7 of RS-485 data wire 1, described block device II 8, current-limiting resistance II 9 is all arranged between the B phase and intelligent terminal 7 of RS-485 data wire 1, current-limiting resistance I 3, current-limiting resistance II 9, block device II 8 and current-limiting resistance II 9 are arranged on ceramic discharge tube 2, between TVS transition diode 5, in parallel with ceramic discharge tube 2.
As shown in the figure, operation principle of the present utility model is as follows: work as direct lightning strike, induction thunder and surge etc. disturb fashionable according to legend from A phase or the B of RS-485 data wire 1, discharge certain energy through ceramic discharge tube 2, and circuit is played to common mode protective action, pass through again the current limliting of current-limiting resistance I 3 and current-limiting resistance II 9, surge current is reduced, thereby reduce secondary faradic generation, in the time that surge arrives TBU components and parts block device I 4 and block device II 8, block device I 4 and block device II 8 snap actions, block advancing of surge, and remaining Weak current is through the common mode protection of TVS transition diode, the voltage producing on photoisolator 6 just cannot be transferred to intelligent terminal 7, thereby protect intelligent terminal 7, reduce the loss that thunderbolt causes, guarantee the normal transmission of electric current.
Claims (3)
1. an intelligent lightning protecting RS-485 wiring device, comprise intelligent terminal (7) and connected RS-485 data wire (1), it is characterized in that, between RS-485 data wire (1) and intelligent terminal (7), ceramic discharge tube (2), TVS transition diode (5) and the photoisolator (6) in parallel with intelligent terminal (7) are set, between RS-485 data wire (1) and intelligent terminal (7), arrange current-limiting resistance and the TBU block device of connecting with intelligent terminal (7) are set between intelligent terminal (7).
2. a kind of intelligent lightning protecting RS-485 wiring device according to claim 1, it is characterized in that described current-limiting resistance comprises the current-limiting resistance I (3) and the current-limiting resistance II (9) that are connected in series with intelligent terminal (7), TBU block device comprises the block device I (4) and the block device II (8) that are connected in series with intelligent terminal (7).
3. a kind of intelligent lightning protecting RS-485 wiring device according to claim 1, between current-limiting resistance I (3) described in it is characterized in that, the A phase and intelligent terminal (7) that block device I (4) is all arranged on RS-485 data wire (1), between described block device II (8), the B phase and intelligent terminal (7) that current-limiting resistance II (9) is all arranged on RS-485 data wire (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320800750.8U CN203674710U (en) | 2013-12-09 | 2013-12-09 | Intelligent lightning-protection RS-485 wiring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320800750.8U CN203674710U (en) | 2013-12-09 | 2013-12-09 | Intelligent lightning-protection RS-485 wiring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203674710U true CN203674710U (en) | 2014-06-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320800750.8U Expired - Fee Related CN203674710U (en) | 2013-12-09 | 2013-12-09 | Intelligent lightning-protection RS-485 wiring instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203674710U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105720567A (en) * | 2016-03-23 | 2016-06-29 | 国网浙江省电力公司湖州供电公司 | Three-dimensional lightning protection system for power grid |
| CN106099893A (en) * | 2016-08-16 | 2016-11-09 | 凌云光技术集团有限责任公司 | Trigger signal surge protection circuit |
-
2013
- 2013-12-09 CN CN201320800750.8U patent/CN203674710U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105720567A (en) * | 2016-03-23 | 2016-06-29 | 国网浙江省电力公司湖州供电公司 | Three-dimensional lightning protection system for power grid |
| CN105720567B (en) * | 2016-03-23 | 2018-07-27 | 国网浙江省电力公司湖州供电公司 | Three-dimensional lightning-protection system for power grid |
| CN106099893A (en) * | 2016-08-16 | 2016-11-09 | 凌云光技术集团有限责任公司 | Trigger signal surge protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140625 Termination date: 20141209 |
|
| EXPY | Termination of patent right or utility model |