CN203826948U - Special surge protector for smart ammeter - Google Patents
Special surge protector for smart ammeter Download PDFInfo
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- CN203826948U CN203826948U CN201420157980.1U CN201420157980U CN203826948U CN 203826948 U CN203826948 U CN 203826948U CN 201420157980 U CN201420157980 U CN 201420157980U CN 203826948 U CN203826948 U CN 203826948U
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Abstract
The utility model discloses a special surge protector for a smart ammeter. The special surge protector comprises a phase-line power supply lightning module, a neutral-line power supply lightning module and a signal lightning module, wherein the phase-line power supply lightning module, the neutral-line power supply lightning module and the signal lightning module are sleeved in a metallic protective cover which is grounded. One end of the phase-line power supply lightning module is connected with a phase line, one end of the neutral-line power supply lightning module is connected with a neutral line, and the other ends of the phase-line power supply lightning module and the neutral-line power supply lightning module are grounded. The signal lightning module is arranged between the intelligent ammeter and an external data emission device which is grounded. The phase-line power supply lightning module and the neutral-line power supply lightning module sleeved in the metallic protective cover are combined in the smart ammeter to effectively prevent lightning stroke and protect the smart ammeter. The special surge protector is small and simply-structured.
Description
Technical field
The utility model relates to electronics, intelligent grid, electric equipment lightning protection field, particularly a kind of intelligent electric meter Special electric surge protector.
Background technology
Thunder and lightning is one of the most serious natural calamity in summer, in the fields such as mechanics of communication, computer network and information system of modern extensive use large scale integrated circuit, prevents that thunder and lightning infringement is particularly important.In recent years, in the construction of national intelligent grid, rural power grids electric meter system has carried out auto upgrading widely, is updated to intelligent electric meter.Intelligent electric meter is used for measurement, collection, storage, analysis user power information, by communication network, user is closely connected with Utilities Electric Co., for the realization of the intelligent grid functions such as power distribution automation lays the foundation.But because corresponding lightning-protecting engineering is not caught up with, there are the phenomenons of intelligent electric meter a large amount of damages due to thunderbolt in countryside low-voltage electric distribution system.Thundercloud just may cause tens and even hundreds of only to show to damage, and thunder and lightning not only causes the direct losses of instrumentation, also causes power consumption charging loss.Ammeter box even occurs to be burst and causes power failure, the phenomenon of rural subscribers' electrical equipment property loss.
Intelligent electric meter lightning-arrest present situation in domestic villages and small towns shows, the intelligent electric meter system lightning measure in villages and small towns is seriously not rigorous.First, all equal unshielded cables of built on stilts power line, also without wearing metal tube shielding measure, if thunder and lightning hits near house, trees or capital dangerous induction overvoltage ripple on the line greatly.Secondly, the most fatal problem is that most of terminal ammeter box is no ground, minority has ground connection but is undesirable: earth resistance does not reach requirement, or the earthing device setting up is under room but do not do total equipotential with building foundation reinforcing bar and be connected, when thunder and lightning hits building, because earth potential counterattack causes electric meter box switch, ammeter, damage, even cause household electrical appliance to damage.Existing also existence utilizes the screen of connection as earth connection; offer equipment or terminal surge protector, because the equivalent frequency of lightning current is very high, sectional area is very little; the communication cable screen induction reactance that length is very long can be very large, and it is invalid that profit uses it as the earth connection lightning current of releasing.
In addition, some ammeters have only been done surge protection to RS485 line cap, and phase line or center line are not made surge protection, this is also unsafe, built on stilts phase line of coming from same cable, center line and connection all can be responded to essentially identical overvoltage when there is lightning, pressure limiting simultaneously, otherwise, SPD on signal side is by the limiting voltage on holding wire, but can cause phase line and center line current potential much larger than order wire current potential, insulation isolation distance in ammeter is inadequate again, the very possible transverse over voltage (secondary discharge) that occurs to alter from power port damages RS485 communication interface.
Surge protector (SPD) is for limiting power circuit and communication line transient overvoltage, and the low electric or electronic system of protection withstand voltage level exempts from the infringement of LEMP or switching overvoltage.Intelligent electric meter is because its operating voltage, withstand voltage level are very low, and has power line and order wire simultaneously, is very easily subject to the harm of Lightning Electromagnetic Pulse, needs to adopt surge protector to do overvoltage protection for this reason.Although yet surge protector product of a great variety on market, due to industry and regional disparity, lacks the special-purpose surge protection product of intelligent electric meter that adapts to field demand at present.Application number be in 200720125713.6 Intelligent ammeter box patent, disclose ammeter box have box cover be interlocked, flip to one side flip, inside and outside lock, the feature such as engineering plastic materials making, can effectively avoid ventilative, leak, enter dirt, not corrosion, the feature that intensity is high; Application number is in 201020570699.2 Intelligent ammeter box patent, to disclose on the cant board that inside door is hinged on the indent position that side opens the door and buckle closure on intaglio plate, is equipped with transparent panel in rectangle on inside door, facilitates reading.Although these two kinds of ammeter boxes are cheap, easy to use above, do not consider lightning measure, especially use the casing of metal material not do lightning protection, once induce on the line lightning wave, its inner intelligent electric meter is damaged.Near the lightning induction causing thunderbolt circuit is the main external cause that intelligent electric meter suffers Lightning Disaster frequently, earth resistance does not reach the earthing device that requires or set up and does not do equipotential with farm house reinforcement foundation and is connected, because earth potential counterattack may cause electric meter box switch, ammeter damage.How solving the deficiencies in the prior art has become a great problem in existing electronics, intelligent grid, electric equipment lightning protection field.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of intelligent electric meter Special electric surge protector for overcoming the deficiencies in the prior art; the utility model has the power source lightning protection module of shelter-clad and signal thunder-arresting module to be combined in intelligent electric meter device in equal covers can effectively prevent thunderbolt; effectively protected intelligent electric meter, this device volume is little and simple in structure.
The utility model is for solving the problems of the technologies described above by the following technical solutions:
A kind of intelligent electric meter Special electric surge protector according to the utility model proposes, comprises phase line power source lightning protection module, neutral line power source lightning protection module, signal thunder-arresting module; Wherein phase line power source lightning protection module, neutral line power source lightning protection module, signal thunder-arresting module are all enclosed within a shelter-clad, this shelter-clad ground connection, one end of phase line power source lightning protection module is connected with phase line, one end of neutral line power source lightning protection module is connected with the neutral line, the equal ground connection of the other end of the other end of phase line power source lightning protection module, neutral line power source lightning protection module, signal thunder-arresting module is arranged between intelligent electric meter and external data transmitter, data transmitting ground connection.
As the scheme of the further optimization of a kind of intelligent electric meter Special electric surge protector of the present utility model, described intelligent electric meter is connected by RS485 order wire with data transmitting.
As the scheme of the further optimization of a kind of intelligent electric meter Special electric surge protector of the present utility model, described phase line power source lightning protection module, neutral line power source lightning protection module, signal thunder-arresting module separately also respectively cover have shelter-clad.
As the scheme of the further optimization of a kind of intelligent electric meter Special electric surge protector of the present utility model, described phase line power source lightning protection module comprises the first gas discharge tube and the first piezo-resistance; The anode of described the first gas discharge tube is connected with phase line, and the negative electrode of the first gas discharge tube is connected with one end of the first piezo-resistance, the other end ground connection of the first piezo-resistance.
As the scheme of the further optimization of a kind of intelligent electric meter Special electric surge protector of the present utility model, described neutral line power source lightning protection module comprises the second gas discharge tube and the second piezo-resistance; The anode of described the second gas discharge tube is connected with the neutral line, and the negative electrode of the second gas discharge tube is connected with one end of the second piezo-resistance, the other end ground connection of the second piezo-resistance.
As the scheme of the further optimization of a kind of intelligent electric meter Special electric surge protector of the present utility model, described signal thunder-arresting module comprises the 3rd gas discharge tube, the 4th gas discharge tube, the first resistance, the second resistance, the first diode to the eight diodes, the first transition twin zener dioder and the second transition twin zener dioder, one end of described the 3rd gas discharge tube is connected with the first resistance, the negative pole of the other end of the first resistance and the first diode, the positive pole of the 3rd diode connects respectively, the positive pole of the first diode, the positive pole of the second diode is connected with the positive pole of the first Transient Suppression Diode respectively, the negative pole of the 3rd diode, the negative pole of the 4th diode is connected with the negative pole of the first Transient Suppression Diode respectively, the negative pole of the other end of the 3rd gas discharge tube and the second diode, the negative pole of the 5th diode, the positive pole of the 4th diode, the positive pole of the 7th diode connects respectively, and the 4th gas discharge tube is connected with the second resistance, the negative pole of the other end of the second resistance and the 6th diode, the positive pole of the 8th diode connects respectively, the positive pole of the 5th diode, the positive pole of the second Transient Suppression Diode is connected with the positive pole of the 6th diode respectively, the negative pole of the 8th diode, the negative pole of the 7th diode is connected with the negative pole of the second Transient Suppression Diode respectively, the earth terminal shared grounding of the 3rd gas discharge tube and the 4th gas discharge tube, the negative pole of the other end of the 4th gas discharge tube and the second diode, the negative pole of the 5th diode, the positive pole of the 4th diode, the positive pole of the 7th diode connects respectively.
As the scheme of the further optimization of a kind of intelligent electric meter Special electric surge protector of the present utility model, the starting resistor of described the first gas discharge tube is 90V; The first piezo-resistance rated operational voltage is 220V, maximum Uc 385V, and the horizontal 1.2kV of voltage protection, leakage current is less than 20 μ A, and the response time is less than 25ns.
As the scheme of the further optimization of a kind of intelligent electric meter Special electric surge protector of the present utility model, the starting resistor of described the second gas discharge tube is 90V; The second piezo-resistance rated operational voltage is 220V, maximum Uc 385V, and the horizontal 1.2kV of voltage protection, leakage current is less than 20 μ A, and the response time is less than 25ns.
Scheme as the further optimization of a kind of intelligent electric meter Special electric surge protector of the present utility model; the starting resistor of described the 3rd gas discharge tube and the 4th gas discharge tube is 90V; the first resistance, the second resistance are 2.2 Ω; the first Transient Suppression Diode, the second Transient Suppression Diode all adopt 1.5KE30A Transient Suppression Diode, and the first diode to the eight diodes all adopt 1N3491 diode.
The utility model adopts above technical scheme compared with prior art, has following technique effect:
(1) the utility model is mainly for the intelligent electric meter of agriculture distribution especially overhead wire, can realize intelligent electric meter has the combination of power line second class protection and RS485 interface communication line surge protection simultaneously, having the power source lightning protection module of shelter-clad and signal thunder-arresting module to be combined in intelligent electric meter device in equal covers can effectively prevent thunderbolt, effectively protect intelligent electric meter;
(2) this device is provided with shelter-clad insulation isolation cooperation, and power source lightning protection module, signal thunder-arresting module get up with shelter-clad cover respectively, can reduce to the full extent interfering with each other between circuit like this, reduce electromagnetic interference, lateral cross talk.No matter make is that power line or order wire suffer the invasion of overvoltage ripple can play effective protective action.
(3) the utility model surge protector volume I is directly installed in intelligent electric meter, simple in structure, and reinforced insulation isolation design is particularly suitable for ammeter box and is arranged on the high exposed region on farm house exterior wall, the situation that ground connection being difficult for realizes.
Accompanying drawing explanation
Fig. 1 is device schematic diagram of the present utility model.
Fig. 2 is the utility model device circuit figure.
Reference numeral: 1-shelter-clad, 2-ammeter box.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail:
Intelligent electric meter Special electric surge protector as shown in Figure 1, comprises phase line power source lightning protection module, neutral line power source lightning protection module, signal thunder-arresting module; Wherein phase line power source lightning protection module, neutral line power source lightning protection module, signal thunder-arresting module are all enclosed within a shelter-clad 1, this shelter-clad 1 ground connection, one end of phase line power source lightning protection module is connected with phase line, one end of neutral line power source lightning protection module is connected with the neutral line, the equal ground connection of the other end of the other end of phase line power source lightning protection module, neutral line power source lightning protection module, signal thunder-arresting module is arranged between intelligent electric meter and external data transmitter, data transmitting ground connection.Intelligent electric meter is connected by RS485 order wire with data transmitting.The receiving terminal of signal thunder-arresting module is connected on the transmitting terminal of intelligent electric meter, and the power information of intelligent electric meter record is brought in transmitting by this; The transmitting terminal of signal thunder-arresting module is connected on the receiving terminal of intelligent electric meter.Phase line power source lightning protection module, neutral line power source lightning protection module, signal thunder-arresting module separately also respectively cover have a shelter-clad 1, phase line power source lightning protection module, neutral line power source lightning protection module, signal thunder-arresting module separately also respectively cover have the effect of a shelter-clad 1 be make each thunder-arresting module not with other thunder-arresting module phase mutual electromagnetic interference; The effect that phase line power source lightning protection module, neutral line power source lightning protection module, these three thunder-arresting module integral body of signal thunder-arresting module are enclosed within a shelter-clad 1 is to allow three thunder-arresting modules be placed on as a whole in ammeter box 2, this shelter-clad 1 is equipotential body, and after ground connection, coefficient of safety is very high.
Power source lightning protection module is installed in intelligent electric meter power line end of incoming cables; mainly prevent that the lightning current of coming in from power line from directly entering single-phase intelligent ammeter; after loading onto power source lightning protection module; most of lightning current can be flow on ground wire by thunder-arresting module; reduce voltage and the electric current of lightning current, thus protection intelligent electric meter.Signal thunder-arresting module is installed at RS485 order wire place; the distance of holding wire and power supply is subject to the condition restriction of product and installation; when thunder and lightning is come in from power line, be certain to sense on holding wire, so installation is specifically designed to the thunder-arresting module of RS485 signal, intelligent electric meter is protected.For more effective protection equipment, should carry out equipotential and connect, in data transmitting, place carries out ground connection, and the shielding conductor on RS485 order wire is firmly connected with ground wire.What on RS485 order wire, transmit is the electric number that intelligent electric meter is measured out, the communication distance of RS485 maximum is about 1219m, peak transfer rate is 10Mbps, transmission rate and transmission range are inversely proportional to, under the transmission rate of 100Kb/S, just can reach maximum communication distance, if need the longer distance of transmission, need to add RS485 repeater.When transfer of data is to data transmitting, as router, wireless aps (being wireless access node, session point or access bridger) etc., by data transmission to user or meter reading personnel.In power source lightning protection module and signal thunder-arresting module module surrounding, install shelter-clad 1 additional, the effect of mutually isolating to reach signal thunder-arresting module and power source lightning protection module.
The circuit diagram of the utility model device as shown in Figure 2, phase line power source lightning protection module comprises the first gas discharge tube GDT1 and the first piezo-resistance R1, the anode of the first gas discharge tube GDT1 is connected with phase line, the negative electrode of the first gas discharge tube GDT1 is connected with one end of the first piezo-resistance R1, the other end ground connection of the first piezo-resistance R1.Neutral line power source lightning protection module comprises the second gas discharge tube GDT2 and the second piezo-resistance R2; The anode of the second gas discharge tube GDT2 is connected with the neutral line, and the negative electrode of the second gas discharge tube GDT2 is connected with one end of the second piezo-resistance R2, the other end ground connection of the second piezo-resistance R2.Signal thunder-arresting module comprises the 3rd gas discharge tube GDT3, the 4th gas discharge tube GDT4, the first resistance R 3, the second resistance R 4, the first diode to the eight diode D1-D8, the first Transient Suppression Diode TVS1 and the second Transient Suppression Diode TVS2, one end of the 3rd gas discharge tube GDT3 is connected with the first resistance R 3, the negative pole of the other end of the first resistance R 3 and the first diode D1, the positive pole of the 3rd diode D3 connects respectively, the positive pole of the first diode D1, the positive pole of the second diode D2 is connected with the positive pole of the first Transient Suppression Diode TVS1 respectively, the negative pole of the 3rd diode D3, the negative pole of the 4th diode D4 is connected with the negative pole of the first Transient Suppression Diode TVS1 respectively, the negative pole of the other end of the 3rd gas discharge tube GDT3 and the second diode D2, the negative pole of the 5th diode D5, the positive pole of the 4th diode D4, the positive pole of the 7th diode D7 connects respectively, the 4th gas discharge tube GDT4 is connected with the second resistance R 4, the negative pole of the other end of the second resistance R 4 and the 6th diode D6, the positive pole of the 8th diode D8 connects respectively, the positive pole of the 5th diode D5, the positive pole of the second Transient Suppression Diode TVS2 is connected with the positive pole of the 6th diode D6 respectively, the negative pole of the 8th diode D8, the negative pole of the 7th diode D7 is connected with the negative pole of the second Transient Suppression Diode TVS2 respectively, the earth terminal shared grounding of the 3rd gas discharge tube GDT3 and the 4th gas discharge tube GDT4, the negative pole of the other end of the 4th gas discharge tube GDT4 and the second diode D2, the negative pole of the 5th diode D5, the positive pole of the 4th diode D4, the positive pole of the 7th diode D7 connects respectively.
The first gas discharge tube GDT1 starting resistor is 90V; The first piezo-resistance R1 rated operational voltage is 220V, maximum Uc 385V, and the horizontal 1.2kV of voltage protection, leakage current is less than 20 μ A, and the response time is less than 25ns.The second gas discharge tube GDT2 starting resistor is 90V; The second piezo-resistance R2 rated operational voltage is 220V, maximum Uc 385V, and the horizontal 1.2kV of voltage protection, leakage current is less than 20 μ A, and the response time is less than 25ns.The starting resistor of the 3rd gas discharge tube GDT3 and the 4th gas discharge tube GDT4 is 90V, the first resistance R 3, the second resistance R 4 are 2.2 Ω, the first Transient Suppression Diode TVS1, the second Transient Suppression Diode TVS2 all adopt 1.5KE30A Transient Suppression Diode, and the first diode to the eight diode D1-D8 all adopt 1N3491 diode.
Piezo-resistance has larger parasitic capacitance, when it is during for the protection of AC power supply system, can under normal operating condition, produce the considerable leakage current of numerical value, can exert an influence to the normal operation of system.After piezo-resistance is connected with gas discharge tube, because the parasitic capacitance of discharge tube is very little, the parasitic capacitance of total series arm can be dropped to several pico farads like this.In this tandem compound branch road, gas discharge tube plays a switch, and when there is no temporary overvoltage, it can be opened piezo-resistance and isolation of system, and making does not almost have leakage current in piezo-resistance, and this just can reduce the reference voltage U of piezo-resistance
1mA, and needn't take the increase that can cause thus leakage current into account, thus the decline of piezo-resistance performance can be slowed down comparatively effectively.During temporary overvoltage, due to the reference voltage U of piezo-resistance
1mAcan select very lowly, as long as gas discharge tube conducting rapidly, series arm can provide the clamping voltage lower than single piezo-resistance so.Due to what use, be RS485 order wire, so for RS485 Interface design signal thunder-arresting module.The communication port of intelligent electric meter is roughly divided into two, because the shock-resistant voltage levvl of microelectronic component of communication interface is low, is very easily subject to lightning surge intrusion.Because agriculture distribution line is mostly built on stilts, so one-level surge protector can not meet the requirement of earial drainage and pressure limiting simultaneously, must at least design 2 grades of surge protectors and just can reach the object of earial drainage and pressure limiting, also relate to cascade matching problem here.Because the lightning overvoltage wave amplitude of invading intelligent electric meter system by signal line is generally in thousands of volts, for protecting the electronic communication equipments such as intelligent electric meter completely, should design multi-stage protection circuit.In the first order of surge protector, utilize gas discharge tube to shunt transient state lightning overvoltage ripple, remaining higher residual voltage utilizes rear class Transient Suppression Diode that surge voltage is clamped at below interface equipment withstand shock magnitude of voltage.Because discharge tube has higher discharge voltage and longer conducting response time; in order to realize the energy coordination between secondary surge protector device; make gas discharge tube conducting earial drainage before temporary overvoltage ripple arrives Transient Suppression Diode; not breakdown to guarantee Transient Suppression Diode, should between the level surge protector of front and back, install cascade additional and coordinate resistance (claiming again decoupling resistance).Coordinate choosing of resistance guarantee, under the prerequisite of surge protector protection efficiency, to reduce the impact because adding cooperation resistance to cause signal line normal transmission as far as possible, namely will consider the transmission characteristic of surge protector.Generally in signal line, distributed capacitance value is larger; adverse effect to signal normal transmission is larger; and because the distributed capacitance value of Transient Suppression Diode is very large, therefore need in rear class surge protecting circuit, install silicon stack additional, to reduce the impact on signal transmission.In typical RS485 class signal surge protector circuit, the DC disruptive voltage of prime gas discharge tube is about 90V.
The utility model can also arrange and damage automatic alarm communication module; when lightning protection module deterioratedly causes losing efficacy or because line surge impacts while causing surge protector to damage fault due to aging; timely tripping protection circuit automatic alarm, the RS485 communication line simultaneously having by intelligent grid itself is realized remote signalling and is also had instantaneous power current quick-break function.
Above embodiment is only explanation technological thought of the present utility model; can not limit protection range of the present utility model for this reason; every technological thought according to the utility model proposes, any change of doing on technical scheme basis, within all falling into the utility model protection range.
Claims (9)
1. an intelligent electric meter Special electric surge protector, is characterized in that: comprise phase line power source lightning protection module, neutral line power source lightning protection module, signal thunder-arresting module; Wherein phase line power source lightning protection module, neutral line power source lightning protection module, signal thunder-arresting module are all enclosed within a shelter-clad, this shelter-clad ground connection, one end of phase line power source lightning protection module is connected with phase line, one end of neutral line power source lightning protection module is connected with the neutral line, the equal ground connection of the other end of the other end of phase line power source lightning protection module, neutral line power source lightning protection module, signal thunder-arresting module is arranged between intelligent electric meter and external data transmitter, data transmitting ground connection.
2. a kind of intelligent electric meter Special electric surge protector according to claim 1, is characterized in that: described intelligent electric meter is connected by RS485 order wire with data transmitting.
3. a kind of intelligent electric meter Special electric surge protector according to claim 1, is characterized in that: described phase line power source lightning protection module, neutral line power source lightning protection module, signal thunder-arresting module also overlap and have shelter-clad respectively separately.
4. a kind of intelligent electric meter Special electric surge protector according to claim 1, is characterized in that: described phase line power source lightning protection module comprises the first gas discharge tube and the first piezo-resistance; The anode of described the first gas discharge tube is connected with phase line, and the negative electrode of the first gas discharge tube is connected with one end of the first piezo-resistance, the other end ground connection of the first piezo-resistance.
5. a kind of intelligent electric meter Special electric surge protector according to claim 1, is characterized in that: described neutral line power source lightning protection module comprises the second gas discharge tube and the second piezo-resistance; The anode of described the second gas discharge tube is connected with the neutral line, and the negative electrode of the second gas discharge tube is connected with one end of the second piezo-resistance, the other end ground connection of the second piezo-resistance.
6. a kind of intelligent electric meter Special electric surge protector according to claim 1, is characterized in that: described signal thunder-arresting module comprises the 3rd gas discharge tube, the 4th gas discharge tube, the first resistance, the second resistance, the first diode to the eight diodes, the first transition twin zener dioder and the second transition twin zener dioder, one end of described the 3rd gas discharge tube is connected with the first resistance, the negative pole of the other end of the first resistance and the first diode, the positive pole of the 3rd diode connects respectively, the positive pole of the first diode, the positive pole of the second diode is connected with the positive pole of the first Transient Suppression Diode respectively, the negative pole of the 3rd diode, the negative pole of the 4th diode is connected with the negative pole of the first Transient Suppression Diode respectively, the negative pole of the other end of the 3rd gas discharge tube and the second diode, the negative pole of the 5th diode, the positive pole of the 4th diode, the positive pole of the 7th diode connects respectively, and the 4th gas discharge tube is connected with the second resistance, the negative pole of the other end of the second resistance and the 6th diode, the positive pole of the 8th diode connects respectively, the positive pole of the 5th diode, the positive pole of the second Transient Suppression Diode is connected with the positive pole of the 6th diode respectively, the negative pole of the 8th diode, the negative pole of the 7th diode is connected with the negative pole of the second Transient Suppression Diode respectively, the earth terminal shared grounding of the 3rd gas discharge tube and the 4th gas discharge tube, the negative pole of the other end of the 4th gas discharge tube and the second diode, the negative pole of the 5th diode, the positive pole of the 4th diode, the positive pole of the 7th diode connects respectively.
7. a kind of intelligent electric meter Special electric surge protector according to claim 4, is characterized in that: the starting resistor of described the first gas discharge tube is 90V; The first piezo-resistance rated operational voltage is 220V, maximum Uc 385V, and the horizontal 1.2kV of voltage protection, leakage current is less than 20 μ A, and the response time is less than 25ns.
8. a kind of intelligent electric meter Special electric surge protector according to claim 5, is characterized in that: the starting resistor of described the second gas discharge tube is 90V; The second piezo-resistance (R2) rated operational voltage is 220V, maximum Uc 385V, and the horizontal 1.2kV of voltage protection, leakage current is less than 20 μ A, and the response time is less than 25ns.
9. a kind of intelligent electric meter Special electric surge protector according to claim 6; it is characterized in that: the starting resistor of described the 3rd gas discharge tube and the 4th gas discharge tube is 90V; the first resistance, the second resistance are 2.2 Ω; the first Transient Suppression Diode, the second Transient Suppression Diode all adopt 1.5KE30A Transient Suppression Diode, and the first diode to the eight diodes all adopt 1N3491 diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420157980.1U CN203826948U (en) | 2014-04-03 | 2014-04-03 | Special surge protector for smart ammeter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420157980.1U CN203826948U (en) | 2014-04-03 | 2014-04-03 | Special surge protector for smart ammeter |
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| CN203826948U true CN203826948U (en) | 2014-09-10 |
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| CN201420157980.1U Expired - Fee Related CN203826948U (en) | 2014-04-03 | 2014-04-03 | Special surge protector for smart ammeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107658838A (en) * | 2017-11-06 | 2018-02-02 | 湖南电铨科技股份有限公司 | AC single phase intelligent object |
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2014
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107658838A (en) * | 2017-11-06 | 2018-02-02 | 湖南电铨科技股份有限公司 | AC single phase intelligent object |
| CN107658838B (en) * | 2017-11-06 | 2023-12-26 | 湖南电铨科技股份有限公司 | AC single-phase intelligent module |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140910 Termination date: 20160403 |