CN203352158U - Multi-pulse synchronous lightning isolation suppression unit and circuit - Google Patents
Multi-pulse synchronous lightning isolation suppression unit and circuit Download PDFInfo
- Publication number
- CN203352158U CN203352158U CN 201320342194 CN201320342194U CN203352158U CN 203352158 U CN203352158 U CN 203352158U CN 201320342194 CN201320342194 CN 201320342194 CN 201320342194 U CN201320342194 U CN 201320342194U CN 203352158 U CN203352158 U CN 203352158U
- Authority
- CN
- China
- Prior art keywords
- lightning
- stop filter
- band stop
- thunder
- surge protector
- 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.)
- Expired - Lifetime
Links
Images
Abstract
The utility model discloses a multi-pulse synchronous lightning isolation suppression unit. The multi-pulse synchronous lightning isolation suppression unit comprises a band-stop filter, wherein a first terminal of the band-stop filter is connected with a port of a strong lightning zone, a second terminal of the band-stop filter is connected with an equipment port of a protection zone, and the impedance of the band-stop filter increases with the increase of a lightning wave frequency. The utility model also discloses a multi-pulse synchronous lightning isolation suppression circuit. With the multi-pulse synchronous lightning isolation suppression unit and circuit, dependence on cable characteristics can be prevented, invasion of most of lightning current can be blocked and isolated, and equipment to be protected can be best protected from lightning.
Description
Technical field
The utility model has related to a kind of shocking preventing technology field, relates in particular to the synchronous thunder and lightning isolation of a kind of multiple-pulse and suppresses unit.
The utility model has also related to the synchronous thunder and lightning isolation of a kind of multiple-pulse and has suppressed circuit.
Background technology
Existing shocking preventing technology is to take thunder and lightning overvoltage characteristic as basis, high impedance moment is converted into to low-impedance nonlinear device and is connected in parallel in power circuit.When thunder and lightning is invaded; start the over-pressure safety device of nonlinear device; provide by-pass shunt, dividing potential drop, current by pass to power circuit; by the lightning current earth mat of releasing; rely on multistage lightning protection measures; reduce circuit or equipment pressure drop, reduction potential difference over the ground, realize the overvoltage protection to equipment, system.Owing to being the protection method that adopts the lightning current energy to shift, therefore can be subject to the impact of the factors such as lightning protection device earth connection length, thickness, induction reactance, ground network ground resistance size, lightning protection device inter-stage matching problem, make the protection effect of equipment, system poor, safeguard easily damages.Because the connection of circuit is not superconductor, under the lightning wave frequency effect, lightning protection device two ends cable can produce induction reactance, impedance, parasitic capacitance and the potential difference that forms.This potential difference can be calculated according to following formula: U=Ldi/dt, as the lightning current of the long 1m (1.44mH) that goes between, invasion is 20kA (8/20 μ s), the voltage on every meter wire is reduced to 3.6kV, if the switch power supply equipment working grounding cable is 10 meters, current potential can be raised to 36kV, causes damaging.If the lightning current of signal system invasion be 5kA (8/20 μ s) the voltage on every meter wire reduce to 0.9kV, current potential can be raised to the 6kV left and right, information system equipment can cause damaging because of overvoltage.The resistance of line resistance can be subject to the impact of power frequency, and frequency is higher, and impedance is larger.
Reckon without the lightning wave frequency in present lightning protection theory to the high-frequency resistance of cable, lightning protection device earth connection, earth mat downlead, the impact of high frequency induction reactance factor.Existing Lightning Prevention Technique requirement, all need to have ground system, and it is the smaller the better to pursue the earth mat grounding resistance, is convenient to better diffusing.All require to adopt the joint grounding system according to the building lightning protections such as IEC IEC 1312, standard GB/T 50057, standard GB/T 50343 and the standard YD5098 of Ministry of Industry and Information design related specifications; the lightning protection device that is about to system (case), Switching Power Supply place of working, equipment shell protection ground, signal shielding ground be connected to ground system through confluence copper bar, realizes the equipotential connection.But because the connection cable of equipment is not superconducting conductor, the cable resistance can be subject to the effects limit such as site environment of lightning wave frequency, cable characteristic (length, induction reactance, sectional area) and engineering construction, can not realize that real equipotential connects, equipment room forms voltage difference.And when there is the thunder and lightning invasion on earth mat or lightning protection device ground, according to IEC and GB relevant criterion, has 50% lightning current and strike back to equipment, the thunder energy of its invasion is born by power-supply system, signal system, metallic conduit respectively.When if this machine room building is subject to the 200KA lightning discharge, earth mat diffusing 50%, the lightning current of 100KA is strikeed back power-supply system, signal system in addition, causes device damage, affects personal safety.Therefore need a kind of dependence that can reduce cable characteristic, ground network resistance size of research, thereby make thunder energy effectively be released, shift, isolate the shocking preventing technology of inhibition.
The utility model content
The technical problems to be solved in the utility model is in order to overcome technological deficiency recited above, provides the synchronous thunder and lightning isolation of a kind of multiple-pulse to suppress unit; Also provide the synchronous thunder and lightning isolation of a kind of multiple-pulse to suppress circuit.
In order to solve technical problem recited above, the utility model is taked following technical scheme:
The synchronous thunder and lightning isolation of a kind of multiple-pulse suppresses unit; include band stop filter; the first end of described band stop filter connects the port in strong minefield; the second end of described band stop filter connects the device port of protection zone, the band stop filter that described band stop filter increases along with the increase of lightning wave frequency for its impedance.
As a kind of preferred version, between the device port of described band resistance filter filter and protection zone, be in series with resettable fuse.
The synchronous thunder and lightning isolation of a kind of multiple-pulse suppresses circuit, includes band stop filter as above, also comprises first order surge protector and second level surge protector; The first end of described first order surge protector connects the first end of band stop filter, the second end ground connection of first order surge protector; The second end of described band stop filter connects the device port of protection zone; The first end of described second level surge protector connects the second end of band stop filter, the second end ground connection of second level surge protector.
Surge protector (SPD) is also referred to as lightning protection device.
As a kind of preferred version; also include resettable fuse; the first end of described resettable fuse connects the second end of band stop filter; the second end of described resettable fuse connects the device port of protection zone; the first end of second level surge protector connects the second end of resettable fuse, the second end ground connection of second level surge protector.
The synchronous thunder and lightning isolation of a kind of multiple-pulse inhibition method, include the synchronous thunder and lightning isolation of multiple-pulse as above and suppress circuit, comprise the steps: that the lightning wave in strong minefield is under the effect of the band stop filter of the synchronous thunder and lightning isolation of multiple-pulse inhibition circuit, reflection, stop most of lightning wave energy, the lightning wave energy is decayed and the peak value steepness of lightning wave energy is reduced, what the waveform of lightning wave energy was become is mild, extended the wave period of lightning wave energy, first start first order surge protector most of lightning wave energy of releasing, remaining lightning wave energy is released by the second level surge protector started, make the lightning wave energy can not enter the device port of protection zone, realize that the thunder and lightning isolation suppresses.
As a kind of preferred version, the lightning wave in strong minefield is under the effect of the band stop filter of the synchronous thunder and lightning isolation of multiple-pulse inhibition circuit, reflection, stop most of lightning wave energy, the lightning wave energy is decayed and the peak value steepness of lightning wave energy is reduced, what the waveform of lightning wave energy was become is mild, extended the wave period of lightning wave energy, first start first order surge protector most of lightning wave energy of releasing, the lightning wave energy of invasion is through resettable fuse, make resettable fuse be varied to a large impedance device, further decay lightning wave energy, remaining lightning wave energy is released by the second level surge protector started, make the lightning wave energy can not enter the device port of protection zone, realize that the thunder and lightning isolation suppresses.
Suppress the frequency range of lightning wave concentration of energy at 100Hz～1MHz.
Further, suppress the frequency range of lightning wave concentration of energy at 1KHz～1MHz.
Further, suppress the frequency range of lightning wave concentration of energy at 10KHz～1MHz.
Through information industry communication products barrier propterty quality supervision and test Spot detection, the checkout equipment of employing has: the digital-storage oscillograph that model is TDS1012B-SC, model are 8/20& 10/350 impulse current test device.The synchronous thunder and lightning isolation of multiple-pulse of the present utility model suppresses unit frequency testing impedance data as table one, and due to the restriction that is subject to equipment, maximum frequency can only be tested to 300KHz; Thunder and lightning frequency impedance of the present utility model suppresses scope between 100HZ-1MHZ, with nature lightning ripple frequency range, coincide; Present different impedances in different frequency ranges, frequency is larger, impedance larger (in Table).
| Test frequency | 10KHz | 100KHz | 300KHz |
| Resistance value | 6.85KΩ | 22.72KΩ | 44.46KΩ |
Table one
The synchronous thunder and lightning isolation of multiple-pulse of the present utility model is suppressed to units in series in the power-supply system loop of protected equipment, when the thunder and lightning invasion is arranged, under the lightning wave frequency effect, the impedance that the synchronous thunder and lightning isolation of multiple-pulse suppresses unit is risen with the rising of lightning wave frequency, because lightning wave can reflect under the hindrance function of the synchronous thunder and lightning isolation inhibition of multiple-pulse unit, part energy can reflect back, and energy is decayed; The impedance that the synchronous thunder and lightning isolation of multiple-pulse suppresses unit also can make the peak value steepness of lightning wave reduce, and decay lightning wave steepness, elongate the wave period of thunder and lightning frequency spectrum, and thunder energy is become gently, reduces the impact of lightening pulse peak value to equipment.
At present lightning wave relative energy accumulation frequency spectrum is as table two:
| Frequency/Hz | 8/20(μs) | 10/200(μs) | 10/350(μs) | 1.2/50(μs) | 10/700(μs) | 4/300(μs) | 0.25/200(μs) |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 1.081×10 -5 | 1.654×10 -4 | 3.019×10 -4 | 4.352×10 -5 | 6.217×10 -4 | 2.669×10 -4 | 9.118×10 -5 |
| 10 | 1.081×10 -4 | 1.654×10 -3 | 3.019×10 -3 | 4.352×10 -4 | 6.217×10 -3 | 2.669×10 -3 | 9.118×10 -4 |
| 100 | 1.081×10 -3 | 0.0165 | 0.0301 | 4.352×10 -3 | 0.0619 | 0.0266 | 9.118×10 -3 |
| 1K | 0.0108 | 0.1619 | 0.2882 | 0.0434 | 0.4391 | 0.2706 | 0.0905 |
| 6.27K | - | - | - | - | 0.9000 | - | - |
| 10K | 0.1074 | 0.7551 | 0.8739 | 0.3823 | 0.9964 | 0.8535 | 0.6122 |
| 12.48K | - | - | 0.9000 | - | - | - | - |
| 14.63K | - | - | - | - | - | 0.9000 | - |
| 21.58K | - | 0.9000 | - | - | - | - | - |
| 43.88K | - | - | - | - | - | - | 0.9000 |
| 87.5K | - | - | - | 0.9000 | - | - | - |
| 100K | 0.7337 | 0.9874 | 0.9929 | 0.9131 | 0.9964 | 0.9880 | 0.9562 |
| 183.17K | 0.9000 | - | - | - | - | - | - |
| 1M | 0.9887 | 0.9999 | 0.9999 | 0.9956 | 0.9999 | 0.9998 | 0.9961 |
| 100M | 1.0000 | 1.0000 | 1.0000 | 0.9999 | 1.0000 | 1.0000 | 0.9998 |
Table two
The thunder and lightning waveform of 8/20 μ s of take is example, the cycle of reference waveform is 28 μ s, through the synchronous thunder and lightning isolation of multiple-pulse of the present utility model, suppresses under the effect of unit, and the cycle of waveform is elongated to 68～75 μ s, lightning current waveform is become gently, greatly reduced the impact of lightening pulse peak value to equipment.
The utility model has the band stop filter of Chinese People's Anti-Japanese Military and Political College's electric current, anti-high frequency magnetic saturation characteristic by series connection in protected equipment loop, when the thunder and lightning invasion is arranged, band stop filter is sync response under the effect of lightning wave frequency, frequency size according to the invasion lightning current, be changed to the damping device of different impedances, most of lightning current of invasion is reflected back in circuit, and the blocking-up lightning current is propagated to rear class, most of thunder energy of decaying; Also reduce the steepness of peak value lightening pulse, the fraction thunder energy of intrusion is converted into to electromagnetic field, make the very mild of peak value thunder and lightning rheology, reduce the impact to equipment.The utility model had both been avoided the dependence to the cable characteristic, also can block, isolate the invasion of most lightning currents, and protected equipment is played to best lightning protection effect.
The accompanying drawing explanation
Fig. 1 is the first structural representation that the synchronous thunder and lightning isolation of multiple-pulse suppresses unit.
Fig. 2 is the second structural representation that the synchronous thunder and lightning isolation of multiple-pulse suppresses unit.
Fig. 3 is the first structural representation that the synchronous thunder and lightning isolation of multiple-pulse suppresses circuit.
Fig. 4 is the first structural representation that the synchronous thunder and lightning isolation of multiple-pulse suppresses circuit.
In figure, 1. band stop filter, 2. resettable fuse, 3. the first surge protector, 4. the second surge protector, 5. strong minefield, 6. protection zone.
Embodiment
Refer to Fig. 1; as shown in the figure; the synchronous thunder and lightning isolation of a kind of multiple-pulse suppresses unit; include band stop filter 1; the first end of band stop filter 1 connects the port in strong minefield 5; the second end of band stop filter 1 connects the device port of protection zone 6, the band stop filter that band stop filter 1 increases along with the increase of lightning wave frequency for its impedance.
Refer to Fig. 2; as shown in the figure; the synchronous thunder and lightning isolation of a kind of multiple-pulse suppresses unit; include band stop filter 1; the first end of band stop filter 1 connects the port in strong minefield 5; the second end of band stop filter 1 connects the device port of protection zone 6, and band stop filter 1 along with the band stop filter that the increase of lightning wave frequency increases, is in series with resettable fuse 2 between the device port of band resistance filter filter 1 and protection zone 6 for its impedance.The synchronous thunder and lightning isolation of this kind of multiple-pulse suppresses cellular construction and is composed in series by the macromolecular material resettable fuse (PPTC) of the bandreject filtering device with Chinese People's Anti-Japanese Military and Political College's electric current, anti-high frequency magnetic saturation characteristic and overcurrent, overtemperature protection, and band stop filter and resettable fuse are connected in electric power loop; The bandreject filtering device is in prime, and resettable fuse is in rear class.When the thunder and lightning invasion is arranged, the prime band stop filter is sync response under the effect of lightning wave frequency, frequency size according to the invasion lightning current, be changed to the damping device of different impedances, both the part lightning current of invasion was reflected back in circuit, the blocking-up lightning current is propagated to rear class, most of thunder energy of decaying; Also reduce the steepness of peak value lightening pulse, the thunder energy of fraction invasion is converted into to electromagnetic field, make the very mild of peak value thunder and lightning rheology, reduce the impact to equipment.After lightning current band resistance filter consumes most of energy; advance again the resettable fuse current foldback circuit of rear class; if this main circuit overcurrent protection; operation that can be safe under normal load current; when large electric current invasion is arranged, the molecular structure of resettable fuse changes, and changes into a large resistance; according to size of current and temperature coefficient, impedance is proportional realizes overcurrent protection.The synchronous thunder and lightning isolation of this multiple-pulse suppresses the advantage that cellular construction takes full advantage of band stop filter and resettable fuse, the prime band stop filter according to the frequency size of invasion lightning current, automatically adjust the characteristic of its impedance magnitude, force to reduce the steepness of thunder and lightning, the lightning wave deformation of peak value obtains gently, make the lightning wave energy be decayed, the wave period of lightning wave is extended (as the wave period of 8/20 μ s lightning wave is 68～75 μ s from 28 μ s time delays), plays and reduces to impact, blocks, isolates the effect of most lightning currents; Rear class is utilized the overcurrent of resettable fuse and the characteristics of overtemperature protection, and remaining lightning current makes the molecule structure change of PPTC inside become the device of a large impedance, can't access arrangement by lightning current, be isolated in outside system.After lightning current disappears, the synchronous thunder and lightning isolation inhibition of multiple-pulse unit returns to normal channel status.
Refer to Fig. 3, as shown in the figure, the synchronous thunder and lightning isolation of a kind of multiple-pulse suppresses circuit, includes band stop filter 1, also comprises first order surge protector 3 and second level surge protector 4; The first end of first order surge protector 3 connects the first end of band stop filter 1, the second end ground connection of first order surge protector 3; The second end of described band stop filter connects the device port of protection zone; The first end of second level surge protector 4 connects the second end of band stop filter 1, the second end ground connection of second level surge protector 4.
Refer to Fig. 4, as shown in the figure, the synchronous thunder and lightning isolation of a kind of multiple-pulse suppresses circuit, includes band stop filter 1 as described above, also comprises first order surge protector 3 and second level surge protector 4; The first end of first order surge protector 3 connects the first end of band stop filter 1, the second end ground connection of first order surge protector 3; The first end of second level surge protector 4 connects the second end of band stop filter 1; the second end ground connection of second level surge protector 4; also include resettable fuse 2; the first end of resettable fuse 2 connects the second end of band stop filter 1; the second end of resettable fuse 2 connects the device port of protection zone 6; the first end of second level surge protector 4 connects the second end of resettable fuse 2, the second end ground connection of second level surge protector 4.
The synchronous thunder and lightning isolation of a kind of multiple-pulse inhibition method, include the synchronous thunder and lightning isolation of multiple-pulse as described above and suppress circuit, comprise the steps: that the lightning wave in strong minefield is under the effect of the band stop filter of the synchronous thunder and lightning isolation of multiple-pulse inhibition circuit, reflection, stop most of lightning wave energy, the lightning wave energy is decayed and the peak value steepness of lightning wave energy is reduced, what the waveform of lightning wave energy was become is mild, extended the wave period of lightning wave energy, first start first order surge protector most of lightning wave energy of releasing, remaining lightning wave energy is released by the second level surge protector started, make the lightning wave energy can not enter the device port of protection zone, realize that the thunder and lightning isolation suppresses.
As a kind of preferred version, the lightning wave in strong minefield is under the effect of the band stop filter of the synchronous thunder and lightning isolation of multiple-pulse inhibition circuit, reflection, stop most of lightning wave energy, the lightning wave energy is decayed and the peak value steepness of lightning wave energy is reduced, what the waveform of lightning wave energy was become is mild, extended the wave period of lightning wave energy, first start first order surge protector most of lightning wave energy of releasing, the lightning wave energy of invasion is through resettable fuse, make resettable fuse be varied to a large impedance device, further decay lightning wave energy, remaining lightning wave energy is released by the second level surge protector started, make the lightning wave energy can not enter the device port of protection zone, realize that the thunder and lightning isolation suppresses.
Suppress the frequency range of lightning wave concentration of energy at 100Hz～1MHz.Further, suppress the frequency range of lightning wave concentration of energy at 1KHz～1MHz.Further, suppress the frequency range of lightning wave concentration of energy at 10KHz～1MHz.
Claims (4)
1. the synchronous thunder and lightning isolation of multiple-pulse suppresses unit; include band stop filter; the first end of described band stop filter connects the port in strong minefield; the second end of described band stop filter connects the device port of protection zone, it is characterized in that: the band stop filter that described band stop filter increases along with the increase of lightning wave frequency for its impedance.
2. the synchronous thunder and lightning isolation of multiple-pulse as claimed in claim 1 suppresses unit, it is characterized in that: between the device port of described band stop filter and protection zone, be in series with resettable fuse.
3. the synchronous thunder and lightning isolation of multiple-pulse suppresses circuit, it is characterized in that: include band stop filter as claimed in claim 1, also comprise first order surge protector and second level surge protector; The first end of described first order surge protector connects the first end of band stop filter, the second end ground connection of first order surge protector; The second end of described band stop filter connects the device port of protection zone; The first end of described second level surge protector connects the second end of band stop filter, the second end ground connection of second level surge protector.
4. the synchronous thunder and lightning isolation of multiple-pulse as claimed in claim 3 suppresses circuit; it is characterized in that: also include resettable fuse; the first end of described resettable fuse connects the second end of band stop filter; the second end of described resettable fuse connects the device port of protection zone; the first end of second level surge protector connects the second end of resettable fuse, the second end ground connection of second level surge protector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320342194 CN203352158U (en) | 2013-06-07 | 2013-06-07 | Multi-pulse synchronous lightning isolation suppression unit and circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320342194 CN203352158U (en) | 2013-06-07 | 2013-06-07 | Multi-pulse synchronous lightning isolation suppression unit and circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203352158U true CN203352158U (en) | 2013-12-18 |
Family
ID=49752009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320342194 Expired - Lifetime CN203352158U (en) | 2013-06-07 | 2013-06-07 | Multi-pulse synchronous lightning isolation suppression unit and circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203352158U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103296668A (en) * | 2013-06-07 | 2013-09-11 | 深圳市雷博斯科技有限公司 | Multiple-pulse synchronous thunder and lightning isolating inhibiting unit, circuit and method |
| CN111030069A (en) * | 2019-12-06 | 2020-04-17 | 北京京航计算通讯研究所 | Radio frequency front end electromagnetic pulse protection method |
| CN111049120A (en) * | 2019-12-06 | 2020-04-21 | 北京京航计算通讯研究所 | Radio frequency front end electromagnetic pulse protection module |
-
2013
- 2013-06-07 CN CN 201320342194 patent/CN203352158U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103296668A (en) * | 2013-06-07 | 2013-09-11 | 深圳市雷博斯科技有限公司 | Multiple-pulse synchronous thunder and lightning isolating inhibiting unit, circuit and method |
| CN111030069A (en) * | 2019-12-06 | 2020-04-17 | 北京京航计算通讯研究所 | Radio frequency front end electromagnetic pulse protection method |
| CN111049120A (en) * | 2019-12-06 | 2020-04-21 | 北京京航计算通讯研究所 | Radio frequency front end electromagnetic pulse protection module |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6778375B1 (en) | Hybrid MOV/gas-tube AC surge protector for building entrance | |
| CN203352158U (en) | Multi-pulse synchronous lightning isolation suppression unit and circuit | |
| Kafshgari et al. | Effects of high frequency modeling & grounding system parameters on transient recovery voltage across vacuum circuit breakers for capacitor switching in wind power plants | |
| Kisielewicz et al. | Surge protective devices efficiency for apparatus protection in front of direct flashes to overhead low voltage lines | |
| CN203519768U (en) | Traveling-wave signal extraction equipment and system for single-phase earth fault | |
| CN102904231B (en) | Prevent isolating and protecting device and isolation protective circuit thereof that earth potential high pressure strikes back | |
| CN201001035Y (en) | RF lightning protection device | |
| Kavi et al. | Detection and identification of high impedance faults in single wire earth return distribution networks | |
| Kisielewicz et al. | Stress to surge protective devices system due to direct flashes to low voltage lines | |
| CN101159378A (en) | Transformer and lightning protection method and device for power supply circuit | |
| CN205304237U (en) | Earth potential counterattack protection grounding box | |
| CN103296668A (en) | Multiple-pulse synchronous thunder and lightning isolating inhibiting unit, circuit and method | |
| CN106684850B (en) | High-tension transformer earth neutral system | |
| Amicucci et al. | Surge protective devices for low voltage systems: practical approach for the protection distance evaluation | |
| KR100783056B1 (en) | surge protect device | |
| Shin et al. | Energy coordination of ZnO varistor based SPDs in surge current due to direct lightning flashes | |
| CN202856332U (en) | Isolation protection device and isolation protection circuit preventing ground potential high voltage counterattack | |
| EP2287990A1 (en) | A device protecting against high frequency overvoltage | |
| JP2010207057A (en) | Lightning arrester | |
| CN205229267U (en) | Transient overvoltage monitoring is with low pressure arm condenser | |
| He | Discussions on factors influencing the effective protection distance of SPD to loads | |
| CN202050130U (en) | Lightning protection socket for household appliances | |
| CN203056562U (en) | Thunder frequency impedance control unit and lightning protection circuit | |
| CN204330922U (en) | Lightning arrester on-line checkingi safety feature | |
| CN205565718U (en) | Lightning -proof grounding device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Multiple-pulse synchronous thunder and lightning isolating inhibiting unit, circuit and method Effective date of registration: 20190815 Granted publication date: 20131218 Pledgee: Ganzhou Nankang District Chengfa Group Financial Investment Co.,Ltd. Pledgor: SHENZHEN LEBOS TECHNOLOGY Co.,Ltd. Registration number: Y2019440020006 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131218 |
|
| CX01 | Expiry of patent term |