CN204761003U - Uneven formula excessive pressure lightning protection circuit of general type - Google Patents
Uneven formula excessive pressure lightning protection circuit of general type Download PDFInfo
- Publication number
- CN204761003U CN204761003U CN201520344161.2U CN201520344161U CN204761003U CN 204761003 U CN204761003 U CN 204761003U CN 201520344161 U CN201520344161 U CN 201520344161U CN 204761003 U CN204761003 U CN 204761003U
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- CN
- China
- Prior art keywords
- lightning protection
- overvoltage
- zero sequence
- sequence current
- piezo
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Abstract
The utility model discloses an uneven formula excessive pressure lightning protection circuit of general type, the amplifier circuit that triggers of overvoltage protection part is connected with zero sequence current transformer secondary side, electromagnetic relay coil respectively, the cutoff switch part is including electromagnetic relay and cutoff switch, anti -interference part includes anti -interference subassembly, two strip leads of protection circuit load end pass zero sequence current transformer, are connected with phase line, zero line respectively through cutoff switch, overvoltage protection determine module is parallelly connected with the load end, and the cross -over connection is held and the leading -out terminal at zero sequence current transformer's inlet wire, and overvoltage protection determine module's current path unthreading zero sequence current transformer, cutoff switch is connected with the trigger amplifier, it connects in parallel in the phase line and zero line of load end to draw forth the end for two of anti -interference subassembly. When high -pressure surge current arrived, cutoff switch broke off rapidly, had both protected hou mian load circuit, also made piezo -resistor can not bear the overcurrent totally, and piezo -resistor is not fragile, has improved the reliability of lightning protection.
Description
Technical field
The utility model relates to overvoltage lightning-protection engineering, particularly the universal uneven formula overvoltage lightning protection circuit of one.
Background technology
Various Surge Protector (SPD) widely uses Zinc-oxide piezoresistor in the market, and it has response speed (25ns) faster, larger energy absorption ability (5-40KA8/20us) and can not produce subsequent current problem.But the shortcoming of piezo-resistance is easily aging and higher distributed capacitance, it is negligible that distributed capacitance problem is used for 50Hz power circuit, and problem of aging then must be considered.
In addition; in vast rural area; any lightning protection lightening protection installation is not installed in most of house; independently earth connection is not installed yet; various Surge Protector on the market; all need earth connection could play its lightning protection earial drainage effect preferably, almost nobody is ready to install earth connection in addition to install Surge Protector, and therefore rural area uses considerably less., all can there is the event of a large amount of broken by lightning electrical appliance, cause fortune to lose in annual thunderstorm season.Although also there is Thunder preventing socket etc. need not install the lightning-protected product of earth connection, its lightning protection lower grade, input power can not be disconnected, and on the high side, and cost performance is low, does not obtain large-scale application.Also have television set manufacturer production for the lighning proof type TV of rural market, its lightning protection circuit adopts the straightforward procedure of power port piezo-resistance in parallel, and lightning protection effect is also not satisfactory.
Utility model content
In order to overcome the shortcoming of prior art with not enough; the utility model provides a kind of universal uneven formula overvoltage lightning protection circuit, and it when lightning surge is come, can disconnect input power automatically; protect the safety of load below, its safety and reliability is far above existing scheme.
The utility model is achieved through the following technical solutions:
A kind of universal uneven formula overvoltage lightning protection circuit, comprises overvoltage protection part, disconnect part and anti-interference part,
Described overpressure protection divides and comprises zero sequence current mutual inductor, triggers amplifying circuit and overvoltage protection detection components, and described triggering amplifying circuit is connected with zero sequence current mutual inductor secondary side, electromagnetic relay coil respectively;
Described disconnect part comprises electromagnetic relay and disconnect;
Described anti-interference part comprises anti-interference assembly;
Two lead-in wires of described protective circuit load end, through zero sequence current mutual inductor, are connected with phase line, zero line respectively by disconnect;
Described overvoltage protection detection components is in parallel with load end, is connected across end of incoming cables and the leading-out terminal of zero sequence current mutual inductor, and the current path of overvoltage protection detection components is not through zero sequence current mutual inductor; On the phase line that two exits of described anti-interference assembly are connected in parallel on load end and zero line, and as far as possible near zero sequence current mutual inductor.
Described overvoltage protection detection components is piezo-resistance, and its value is determined according to lightning protection grade and supply voltage.
Described anti-interference assembly is capacitor, and in ac power circuit, the withstand voltage of this capacitor is more than or equal to 1.414 times of pressure sensitive voltage, and capacity is 0.2 ~ 1.0 μ F, and preferred value is 0.47 μ F.Easily purchase from the viewpoint of element and can select 0.22 μ F, 0.27 μ F or 0.3 μ F etc.
Disconnect is worked by the adhesive action of electromagnetic relay, when electromagnetic relay energising adhesive, promotes disconnect and phase line and zero line and load are disconnected.
When zero sequence current mutual inductor primary side current is non-vanishing namely there is residual current time, secondary side produce induced current, through trigger amplifying circuit amplify, drive make electromagnetic relay adhesive, promote disconnect disconnect.
Under normal circumstances, through the magnetic field equal and opposite in direction that the zero line in zero-sequence transformer and phase line produce, direction is contrary, and just in time offset, be in poised state, zero-sequence transformer secondary side does not have induced current.When supply voltage peak value exceedes the pressure sensitive voltage of piezo-resistance; piezo-resistance has electric current to pass through; its current path is outside zero-sequence transformer magnet ring; make zero sequence current mutual inductor primary side current be no longer zero, create magnetic field, thus produce induced current at secondary side; amplify through triggering amplifying circuit; drive electromagnetic relay adhesive, promote disconnect open circuit, do not damaged by overvoltage to protect load.
Anti-interference assembly in this protective circuit; the spike in power line can be absorbed, prevent piezo-resistance from being punctured by it, make zero sequence current mutual inductor primary side produce residual current; cause producing misoperation, simultaneously can useful life of available protecting piezo-resistance.
Compared with prior art, this protective circuit has following advantage and beneficial effect: when high voltage surge electric current arrives, disconnect disconnects rapidly; both load circuit had below been protected; make piezo-resistance can not bear overcurrent completely, piezo-resistance is not fragile, improves the reliability of lightning protection yet.
Accompanying drawing explanation
Fig. 1 is universal uneven formula overvoltage lightning protection circuit connection diagram in embodiment;
Fig. 2 is the protective circuit connection diagram removing anti-interference assembly in embodiment;
Fig. 3 be in embodiment piezo-resistance series thermal-sensitive resistance as the protective circuit connection diagram of overvoltage protective module.
In figure, 1. zero line 2. phase line 3. zero sequence current mutual inductor 4. triggers amplifying circuit 5. electromagnetic relay 6. piezo-resistance 7. capacitor 8. disconnect.
Embodiment
Below in conjunction with drawings and Examples, the utility model content is described in further detail, but execution mode of the present utility model is not limited thereto.
Embodiment:
With reference to Fig. 1, a kind of universal uneven formula overvoltage lightning protection circuit, comprises overvoltage protection part, disconnect part and anti-interference part,
Described overpressure protection divides and comprises zero sequence current mutual inductor 3, triggers amplifying circuit 4 and overvoltage protection detection components, and described triggering amplifying circuit 4 is connected with zero sequence current mutual inductor 3 secondary side, electromagnetic relay 5 coil respectively;
Described disconnect part comprises electromagnetic relay 5 and disconnect 8;
Described anti-interference part comprises capacitor 7;
Two lead-in wires that described protective circuit load RL holds, through zero sequence current mutual inductor 3, are connected with phase line 2, zero line 1 respectively by disconnect 8;
Described overvoltage protection detection components is held in parallel with load RL, is connected across end of incoming cables and the leading-out terminal of zero sequence current mutual inductor 3, and the current path of overvoltage protection detection components is not through zero sequence current mutual inductor 3; The link gear of described electromagnetic relay 5 is connected with disconnect 8; Two exits of described anti-interference assembly are connected in parallel in the phase line 2 and zero line 1 that load RL holds.
This routine overvoltage protection detection components is piezo-resistance 6, piezo-resistance 6 value: pressure sensitive voltage 470V ± 10%, through-current capacity 25kA, requires the piezo-resistance adopting respective series during engineering uses according to physical circuit.Such as: 220V AC power, lightning protection grade B level piezo-resistance 6 value: pressure sensitive voltage 430V ~ 470V, through-current capacity 40kA; Lightning protection grade C level piezo-resistance 6 value: pressure sensitive voltage 430V ~ 470V, through-current capacity 20kA.
Described anti-interference assembly is the capacitor 7 of 0.3 μ F, withstand voltage 1200V, and in ac power circuit, the withstand voltage of this capacitor is more than or equal to 1.414 times of pressure sensitive voltage, capacity 0.2 ~ 1.0 μ F, and preferred value is 0.47 μ F.Easily purchase from the viewpoint of element and can select 0.22 μ F, 0.27 μ F or 0.3 μ F etc.
Electromagnetic relay 5 is worked by trigger amplifier, when electromagnetic relay energising adhesive, promotes mechanical release device and disconnect 8 is disconnected.
When piezo-resistance 6 conducting, zero sequence current mutual inductor 3 primary side produces residual current, thus amplifies for triggering amplifying circuit 4 at its secondary side generation induced current, promotes electromagnetic relay action, drives disconnect 8 to disconnect.
Protective value test is carried out to the uneven formula overvoltage lightning protection circuit of the present embodiment:
Overvoltage lightning protection is tested, the overvoltage lightning protection circuit that the present embodiment makes: common 220V lighting circuit voltage peak≤275V, when accessing supply voltage lower than 275V, the band overvoltage lightning protection circuit of the present embodiment is failure to actuate, repeat access 20 times, all be failure to actuate, namely normal use does not have misoperation; During access 380V industry voltage, Circuit Interrupt way switch 8 disconnects instantaneously, and repeating 20 times, is all disconnect instantaneously, and the load be connected to below does not damage.
Circuit as shown in Figure 2, the circuit not with anti-interference assembly, in Practical Project, access 220V illuminating line, because of the frequent deenergization of external power grid interference disconnect, namely frequently can produce misoperation.
High-voltage large current shock-testing: by this circuit ON; power supply being raised to 4000VDC/20KA(8/20 μ s) high voltage pulse bringing onto load carries out moment impact; this protective circuit disconnects instantaneously; the load connected below does not damage; continue 10 Secondary Shocks tests; first time impacts after rear disconnect disconnects and does not close, and load does not all damage, and all serves the effect of protection load.
As shown in Figure 3; use piezo-resistance series thermal-sensitive resistance as overvoltage protective module; when overvoltage arrives, circuit can disconnect, and plays the effect of protection load; but; in engineering uses, after finding thunder and lightning weather, still there is load appliance to damage, find through test; this circuit when high pressure continuous quadratic impacts, after the load appliance that connects have damage.
Through improving, finally obtain the scheme shown in Fig. 1, this circuit can bear the impact of high pressure continuous quadratic in test, and the scheme of Fig. 3 then can not bear the continuous quadratic impact of high pressure.This protector, in engineering uses, up to the present, through repeatedly thunder and lightning weather, has not found the situation that load appliance damages.
This protector accommodation is extensive, can be applied in nearly all ac-dc power supply circuit, be set directly at the power inleting terminal of electrical appliance, to realize overvoltage lightning protection to electrical appliance.
Above-described embodiment is a kind of execution mode of the present utility model, but execution mode of the present utility model is not limited thereto, and other any changes, replacement etc. not departing from substantial principle of the present utility model, all in protection range of the present utility model.
Claims (6)
1. a universal uneven formula overvoltage lightning protection circuit, is characterized in that, comprise overvoltage protection part, disconnect part and anti-interference part,
Described overpressure protection divides and comprises zero sequence current mutual inductor, triggers amplifying circuit and overvoltage protection detection components, and described triggering amplifying circuit is connected with zero sequence current mutual inductor secondary side, electromagnetic relay coil respectively;
Described disconnect part comprises electromagnetic relay and disconnect;
Described anti-interference part comprises anti-interference assembly;
Two lead-in wires of described protective circuit load end, through zero sequence current mutual inductor, are connected with phase line, zero line respectively by disconnect;
Described overvoltage protection detection components is in parallel with load end, is connected across end of incoming cables and the leading-out terminal of zero sequence current mutual inductor, and the current path of overvoltage protection detection components is not through zero sequence current mutual inductor; Described disconnect is connected with trigger amplifier; On the phase line that two exits of described anti-interference assembly are connected in parallel on load end and zero line.
2. universal uneven formula overvoltage lightning protection circuit according to claim 1, it is characterized in that, described overvoltage protection detection components is piezo-resistance, piezo-resistance value: pressure sensitive voltage 470V ± 10%, through-current capacity 25kA.
3. universal uneven formula overvoltage lightning protection circuit according to claim 2, is characterized in that, described piezo-resistance value: pressure sensitive voltage 430V ~ 470V, through-current capacity 40kA.
4. universal uneven formula overvoltage lightning protection circuit according to claim 2, is characterized in that, described piezo-resistance value: pressure sensitive voltage 430V ~ 470V, through-current capacity 20kA.
5. universal uneven formula overvoltage lightning protection circuit according to claim 1; it is characterized in that; described anti-interference assembly is capacitor, and in ac power circuit, the withstand voltage of this capacitor is more than or equal to 1.414 times of pressure sensitive voltage, and capacity is 0.2 ~ 1.0 μ F.
6. universal uneven formula overvoltage lightning protection circuit according to claim 5, is characterized in that, described condenser capacity is 0.3 μ F or 0.47 μ F.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520344161.2U CN204761003U (en) | 2015-05-25 | 2015-05-25 | Uneven formula excessive pressure lightning protection circuit of general type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520344161.2U CN204761003U (en) | 2015-05-25 | 2015-05-25 | Uneven formula excessive pressure lightning protection circuit of general type |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204761003U true CN204761003U (en) | 2015-11-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520344161.2U Withdrawn - After Issue CN204761003U (en) | 2015-05-25 | 2015-05-25 | Uneven formula excessive pressure lightning protection circuit of general type |
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| CN (1) | CN204761003U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300242A (en) * | 2015-05-25 | 2017-01-04 | 广西荔浦深蓝电子有限公司 | A kind of universal uneven formula overvoltage lightning protection circuit |
-
2015
- 2015-05-25 CN CN201520344161.2U patent/CN204761003U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300242A (en) * | 2015-05-25 | 2017-01-04 | 广西荔浦深蓝电子有限公司 | A kind of universal uneven formula overvoltage lightning protection circuit |
| CN106300242B (en) * | 2015-05-25 | 2018-11-09 | 广西荔浦深蓝电子有限公司 | A kind of universal uneven formula overvoltage lightning protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20151111 Effective date of abandoning: 20181109 |