CN207490503U - Circuit is protected in a kind of distribution terminal multichannel remote signalling - Google Patents
Circuit is protected in a kind of distribution terminal multichannel remote signalling Download PDFInfo
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- CN207490503U CN207490503U CN201721372495.6U CN201721372495U CN207490503U CN 207490503 U CN207490503 U CN 207490503U CN 201721372495 U CN201721372495 U CN 201721372495U CN 207490503 U CN207490503 U CN 207490503U
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Abstract
The utility model discloses a kind of distribution terminal multichannel remote signalling to protect circuit; including first input end L1 in, the second input terminal L2 in, the first output terminal L1 out, second output terminal L2 out, first resistor (R1) and second resistance (R2), bi-directional voltage stabilizing Schottky diode (T1), ingress (S1) is opened in outside.The utility model fast response time can effectively absorb positive and negative surge pulse, and no inductive effect will not generate error signal, ensure the normal operation of distribution terminal multichannel remote signalling circuit, enhance stability, reliability and the antijamming capability of remote signalling circuit.
Description
Technical field
The utility model is related to a kind of protection circuits, and in particular to circuit is protected in a kind of distribution terminal multichannel remote signalling.
Background technology
Power distribution network is directly to be connected as the end of electric system with user the network of distribution electric energy effect, and distribution is whole
End plays a part of monitoring in entire distribution automation system, monitors, the automatic collection of realization each electric parameter of power distribution network,
Control and the remote transmission of data.Wherein in all technical performance indexs of distribution terminal, the surge anti-interference of remote signalling circuit
Spend particularly important, whether be related to distribution terminal can normal operation under the operating mode being interfered.
IV grades of standard requirements, between external switch amount and " common end ", application ± 2000V electricity are tested according to surge immunity
Press 8/20us pulses, it is impossible to damage or influence the acquisition of switching value.In the prior art, common end is increased in remote signalling input terminal
One Zinc-oxide piezoresistor, for absorbing surge.Although the assimilation effect of the way surge is apparent, efficiently and effectively protect distant
Believe circuit late-class circuit component.But in practical application process, using Zinc-oxide piezoresistor as surge absorbing element,
It can have the following problems：
1) C-V characteristic due to Zinc-oxide piezoresistor under 8/20us pulse currents, voltage peak can be earlier than current peaks
Value, in inductive effect, into the continuous current circuit of a positive induced electromotive force, optocoupler conducting generates error signal, shadow in remote signalling circuit
Ring the acquisition of switching value；
2) since the response speed of varistor is slightly slower than the conducting speed of optocoupler, make in ± 2000V 8/20us pulses
Under, error signal can be also generated, influences the acquisition of switching value.
Invention content
The purpose of this utility model is for above in the protection circuit of remote signalling circuit absorption surge in ± 2000V 8/
Under 20us impulse actions, remote signalling circuit can generate error signal, the problem of influencing switch acquisition, provide a kind of distribution terminal multichannel
Circuit is protected in remote signalling.
The utility model employs following technical solution：
Including first input end L1-in, the second input terminal L2-in, the first output terminal L1-out, second output terminal L2-
Ingress S1 is opened in out, first resistor R1 and second resistance R2, bi-directional voltage stabilizing Schottky diode T1, outside, wherein described is outer
The first end that portion opens ingress S1 is connected with the first input end L1-in；The first end of the first resistor R1 and institute
The second end that ingress S1 is opened in the outside stated is connected；The second end of the first resistor R1 and the bi-directional voltage stabilizing Schottky
Diode T1 first ends are connected with the second resistance R2 first ends；The second end of the second resistance R2 and described the
One output terminal L1-out is connected；The bi-directional voltage stabilizing Schottky diode T1 be connected with the second input terminal L2-in and
The second output terminal L2-out is connected.
Bi-directional voltage stabilizing Schottky diode is with transient power is big, leakage current is low, breakdown voltage deviation, clamping voltag are easier to
The voltage at input terminal both ends (picosecond) can be limited in very low range by the characteristic of control in a short period of time, therefore
Bi-directional voltage stabilizing Schottky diode is selected as protective device.Bi-directional voltage stabilizing Schottky diode is in usually circuit normal transmission
All in high-impedance state, although there are minimum leakage current, the normal transmission of circuit is not influenced substantially.When by transient state high energy
During stroke, breakdown conditions are quickly entered in the bi-directional voltage stabilizing Schottky diode of high-impedance state, absorb up to thousands of watts of surge
Power clamps input voltage, and the equipment for protecting rear end is not destroyed.
The utility model is solved in the prior art under ± 2000V 8/20us impulse actions, and remote signalling circuit can generate mistake
Signal, the problem of influencing switch acquisition, fast response time can effectively absorb positive and negative surge pulse, no inductive effect, and
Error signal will not be generated, ensures the normal operation of distribution terminal multichannel remote signalling circuit, enhances stability, the reliability of remote signalling circuit
And antijamming capability.
Description of the drawings
Fig. 1 is the utility model surge absoption remote signalling circuit diagram.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
It clearly and completely describes, it is clear that described embodiment is only one point of embodiment of the utility model rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work
All other embodiments obtained shall fall within the protection scope of the present invention.
The utility model is a kind of distribution terminal multichannel remote signalling protection circuit, and fast response time can effectively absorb positive and negative
Surge pulse, no inductive effect, and error signal will not be generated, enhance stability, reliability and the antijamming capability of remote signalling circuit.
The utility model surge absoption remote signalling circuit diagram as shown in Figure 1, including first input end L1-in, second
Input terminal L2-in, the first output terminal L1-out, second output terminal L2-out, first resistor R1 and second resistance R2, bi-directional voltage stabilizing
Ingress S1 is opened in Schottky diode T1, outside, wherein the first end of ingress S1 and the input terminal are opened in the outside
L1-in is connected；The second end that the first end of the first resistor R1 opens ingress S1 with the outside is connected；Described
The second end of first resistor R1 and the bi-directional voltage stabilizing Schottky diode T1 first ends and the second resistance R2 first
End is connected；The second end of the second resistance R2 is connected with the first output terminal L1-out；Bi-directional voltage stabilizing Xiao
Special based diode T1 is connected with the second input terminal L2-in and is connected with the second output terminal L2-out.
When by transient state high energy impact events, the huge surge of energy enters first input end L1-in and the second input terminal
L2-in.Breakdown conditions are quickly entered in the bi-directional voltage stabilizing Schottky diode of high-impedance state, absorb up to thousands of watts of surge work(
Rate clamps input voltage, and the equipment for protecting rear end is not destroyed.
The utility model response speed is exceedingly fast, and can effectively absorb positive and negative surge pulse, and no inductive effect will not generate mistake
Signal ensures the normal operation of distribution terminal multichannel remote signalling circuit, enhances the stability, reliability and anti-interference energy of circuit
Power.
Claims (1)
1. circuit is protected in a kind of distribution terminal multichannel remote signalling, including first input end L1-in, the second input terminal L2-in, first defeated
Outlet L1-out, second output terminal L2-out, first resistor (R1) and second resistance (R2), bi-directional voltage stabilizing Schottky diode
(T1), ingress (S1) is opened in outside, it is characterised in that：
The first end that ingress (S1) is opened in the outside is connected with the first input end L1-in；
The second end that the first end of the first resistor (R1) opens ingress (S1) with the outside is connected；
The second end of the first resistor (R1) and bi-directional voltage stabilizing Schottky diode (T1) first end and described
Second resistance (R2) first end is connected；
The second end of the second resistance (R2) is connected with the first output terminal L1-out；
The bi-directional voltage stabilizing Schottky diode (T1) is connected and second output with the second input terminal L2-in
End L2-out is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721372495.6U CN207490503U (en) | 2017-10-21 | 2017-10-21 | Circuit is protected in a kind of distribution terminal multichannel remote signalling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721372495.6U CN207490503U (en) | 2017-10-21 | 2017-10-21 | Circuit is protected in a kind of distribution terminal multichannel remote signalling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207490503U true CN207490503U (en) | 2018-06-12 |
Family
ID=62481112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721372495.6U Active CN207490503U (en) | 2017-10-21 | 2017-10-21 | Circuit is protected in a kind of distribution terminal multichannel remote signalling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207490503U (en) |
-
2017
- 2017-10-21 CN CN201721372495.6U patent/CN207490503U/en active Active
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