CN204614578U - Electric energy meter D.C. magnetic field generating means and interference test device - Google Patents
Electric energy meter D.C. magnetic field generating means and interference test device Download PDFInfo
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- CN204614578U CN204614578U CN201520110892.0U CN201520110892U CN204614578U CN 204614578 U CN204614578 U CN 204614578U CN 201520110892 U CN201520110892 U CN 201520110892U CN 204614578 U CN204614578 U CN 204614578U
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Abstract
The utility model discloses a kind of electric energy meter D.C. magnetic field generating means and interference test device, electric energy meter D.C. magnetic field generating means comprises excitation mechanism and for providing the current device of exciting current to excitation mechanism; Excitation mechanism comprises: the first yoke of strip structure, be wrapped in the first yoke for input exciting current coil, along at least one the L-type yoke for the air gap in the flux circuit that reduces by the first yoke and produce perpendicular to circumference distribution in the plane of the first yoke axial direction.Interference test device comprises: electric energy meter D.C. magnetic field generating means, electric energy meter calibrating apparatus and host computer as above.Electric energy meter D.C. magnetic field generating means of the present utility model and interference test device solve that the excitation mechanism of existing electric energy meter D.C. magnetic field generating means is huge, the technical problem of cost intensive, achieve the simple designs of excitation mechanism in electric energy meter D.C. magnetic field generating means, reduce the cost of electric energy meter D.C. magnetic field generating means.
Description
Technical field
The utility model relates to electric energy metrical test field, especially, relates to a kind of electric energy meter D.C. magnetic field generating means and interference test device.
Background technology
In the use procedure of electric energy meter, if there is extraneous high-intensity magnetic field to disturb, it can produce very large error in dipping.Induction type electric energy meter is due to the operation principle of its electromagnetic induction, and when being subject to high-intensity magnetic field interference, some of them magnetic device there will be demagnetization phenomenon as damp magnetic steel, causes permanent damage; The impact that the character wheel register that stepping motor conventional in electronic electric energy meter promotes is subject to strong magnetic can stop rolling and upset, thus stops the accumulative of energy value, and in addition, sampling instrument transformer complete failure under the state of Flux saturation can cause very large negative error.Some power consumers order about by interests, utilize above-mentioned principle, and by applying high-intensity magnetic field on electric energy meter, cause the few charging of electric energy meter or not charging, thus carry out stealing, this causes sizable economic loss to country, has also harmed the fairness of metering.For this phenomenon, OIML electric energy meter international recommendation R46 requires that electric energy meter must carry out 200mT direct current high-intensity magnetic field interference test when metering experiment, and " intelligent electric energy meter functional specification " that State Grid Corporation of China formulates in the recent period also contains this content of the test, namely apply the direct current high-intensity magnetic field within 200mT to electric energy meter, measure its error in dipping.
With reference to figure 1, current domestic measurement verification department adopts permanent magnet 9 as DC magnetic field source, the magnetic field of required size is provided, this is because adopt permanent magnet can produce the D.C. magnetic field being not less than 200mT magnetic field intensity met needed for electric energy meter interference test to interference test.There are the following problems usually as magnetic field sources to adopt permanent magnet: 1, the magnetic of permanent magnet can keep always, general in the ironing surface magnetic field intensity of permanent magnetism at more than 500mT, this will produce very large suction, cause there is potential safety hazard, require also higher to the storage of permanent magnet and application; 2, when near ferromagnetic substances such as test table, tested instrument, testing tool and parts, if do not take any safeguard measure, tester fetches processing ease and causes and crush, and causes cut to the object contacted with permanent magnet surfaces, may cause damage time serious; 3, when the temperature of permanent magnet operational environment changes within the specific limits, the magnetic of magnet can decline to some extent, and this change can not recover completely when getting back to uniform temperature, and permanent magnet material structure is generally fragile, be difficult to again in use procedure avoid clashing into, and clash into the damage caused, greatly can reduce the magnetic field intensity of permanent magnet cross section certain position; 4, the magnetic field intensity that permanent magnet produces is certain value, causes the test underaction under different magnetic field size experimental condition.
For the problem adopting permanent magnet as disturbing magnetic field source, the field generator for magnetic of Current Control can be adopted to solve permanent magnet as the various problems occurred during field generator for magnetic, but its cost needs increase field power supply power or coil turn to produce the larger magnetic field met required for electric energy meter interference test, thus cause the excitation mechanism of electric energy meter D.C. magnetic field generating means huge, cost intensive.So, need a kind of structure of design badly simple, the electric energy meter D.C. magnetic field generating means that can meet magnetic field needed for electric energy meter interference test with low cost.
Utility model content
The utility model provides a kind of electric energy meter D.C. magnetic field generating means and interference test device, existing produce and meet magnetic field needed for electric energy meter interference test and cause the excitation mechanism of electric energy meter D.C. magnetic field generating means huge, the technical problem of cost intensive by increasing field power supply power or coil turn to solve.
According to an aspect of the present utility model, a kind of electric energy meter D.C. magnetic field generating means is provided, comprises:
Excitation mechanism and for providing the current device of exciting current to excitation mechanism;
The first yoke that excitation mechanism comprises strip structure and the coil for inputting exciting current be wrapped in the first yoke;
Excitation mechanism also comprises edge perpendicular at least one distribution circumferential in the plane of the first yoke axial direction for reducing the L-type yoke of the air gap in the flux circuit of the first yoke generation, and the end of L-type yoke and the end of the first yoke connect and compose U-shaped structure.
Further, the quantity of L-type yoke is four, and four L-type yokes are along being uniformly distributed perpendicular to circumference in the plane of the first yoke axial direction.
Further, current device is direct current standard source.
Further, electric energy meter D.C. magnetic field generating means also comprises the magnetic field calibration device for calibrating electric energy meter D.C. magnetic field generating means.
Further, magnetic field calibration device adopts standard teslameter.
Further, standard teslameter comprises the hall probe in the magnetic field for detecting electric energy meter D.C. magnetic field generating means.
Further, the first yoke, L-type yoke all adopt pure iron material to make.
According to another aspect of the present utility model, additionally provide a kind of electric energy meter D.C. magnetic field interference test device, comprising:
Electric energy meter D.C. magnetic field generating means as above, electric energy meter calibrating apparatus and host computer;
Host computer is used for sending the pre-set parameter of calibrating point to electric energy meter calibrating apparatus and sending disturbing magnetic field intensity settings to the current device of electric energy meter D.C. magnetic field generating means;
Electric energy meter calibrating apparatus, for being connected with tested electric energy meter, providing calibrating electric current and calibrating voltage to tested electric energy meter, and obtaining the error of tested electric energy meter;
Electric energy meter D.C. magnetic field generating means is used for the disturbing magnetic field providing disturbing magnetic field intensity settings size to tested electric energy meter.
Further, electric energy meter calibrating apparatus and current device include the RS232 communication interface for communicating with host computer.
The utility model has following beneficial effect:
Electric energy meter D.C. magnetic field generating means of the present utility model, by increasing the L-type yoke of the air gap in the flux circuit of reduction first yoke generation to excitation mechanism, reduce the magnetic resistance of air gap in the flux circuit of the first yoke generation, larger magnetic field intensity can be provided under identical field power supply power or coil turn situation, thus do not need to increase field power supply power or coil turn and produce and meet magnetic field needed for electric energy meter interference test, the excitation mechanism solving existing electric energy meter D.C. magnetic field generating means is huge, the technical problem of cost intensive, achieve the simple designs of excitation mechanism in electric energy meter D.C. magnetic field generating means, reduce the cost of electric energy meter D.C. magnetic field generating means.
Electric energy meter D.C. magnetic field interference test device of the present utility model, by host computer to the pre-set parameter of electric energy meter calibrating apparatus transmission calibrating point with to the current device of electric energy meter D.C. magnetic field generating means transmission disturbing magnetic field set point, solving existing electric energy meter D.C. magnetic field interference test can not the technical problem of automatic Verification, achieve the automatic Verification of interference test, improve automation and the intellectuality of electric energy meter D.C. magnetic field interference test.
Except object described above, feature and advantage, the utility model also has other object, feature and advantage.Below with reference to figure, the utility model is described in further detail.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is that prior art adopts permanent magnet as the structural representation of the electric energy meter interference test device of DC magnetic field source;
Fig. 2 is the structural representation of the electric energy meter D.C. magnetic field generating means of the utility model preferred embodiment;
Fig. 3 is the structured flowchart of the electric energy meter D.C. magnetic field interference test device of the utility model preferred embodiment.
Reference numeral:
1, the first yoke; 2, L-type yoke; 3, direct current standard source; 4, coil; 5, tested electric energy meter; 6, electric energy meter calibrating apparatus; 7, excitation mechanism; 8, host computer; 9, permanent magnet.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
With reference to Fig. 2, preferred embodiment of the present utility model provides a kind of electric energy meter D.C. magnetic field generating means, comprising: excitation mechanism 7 and the current device for providing exciting current to excitation mechanism 7; The first yoke 1 that excitation mechanism 7 comprises strip structure and the coil 4 for inputting exciting current be wrapped in the first yoke 1; Excitation mechanism 7 also comprises edge perpendicular at least one distribution circumferential in the plane of the first yoke 1 axial direction for reducing the L-type yoke 2 of the air gap in the flux circuit of the first yoke 1 generation, and the end of L-type yoke 2 and the end of the first yoke 1 connect and compose U-shaped structure.
Electric energy meter D.C. magnetic field generating means of the present utility model, by increasing the L-type yoke of the air gap in the flux circuit of reduction first yoke generation to excitation mechanism, reduce the magnetic resistance of air gap in the flux circuit of the first yoke generation, larger magnetic field intensity can be provided under identical field power supply power or coil turn situation, thus do not need to increase field power supply power or coil turn and produce and meet magnetic field needed for electric energy meter interference test, the excitation mechanism solving existing electric energy meter D.C. magnetic field generating means is huge, the technical problem of cost intensive, achieve the simple designs of excitation mechanism in electric energy meter D.C. magnetic field generating means, reduce the cost of electric energy meter D.C. magnetic field generating means.
For the field distribution of approximate simulation permanent magnet magnetic, reach test disturbing magnetic field requirement of strength, the quantity of the L-type yoke 2 of the present embodiment is four, and four L-type yokes 2 are uniformly distributed along circumference in the plane perpendicular to the first yoke 1 axial direction.Adopt the excitation mechanism 7 of L-type yoke 2 comprised for reducing the air gap in flux circuit that the first yoke 1 produces, the principle meeting the magnetic field intensity that to provide larger under identical field power supply power or coil turn situation is as follows:
According to electric current and magnetic field dependence, the pass that can obtain magnetic flux and electric current is:
Wherein,
represent magnetic flux, N represents coil turn, and I represents exciting current, R
mrepresent flux circuit magnetic resistance.
And the magnetic resistance R in formula (1)
mbe made up of the magnetic resistance of iron core and the magnetic resistance of air gap, be expressed as follows:
Wherein, L
mrepresent iron core effective magnetic circuit length, L
arepresent air gap, μ represents iron core magnetic conductance, μ
0represent permeability of vacuum, S represents cross-sectional area.
When iron core working point magnetic strength is lower, iron core magnetic conductance μ >> μ
0, the magnetic resistance of air gap is far longer than the magnetic resistance of iron core, the available formula (3) that (2) are approximate with the formula represent:
Thus can obtain, the magnetic field intensity H in air gap is:
Because the magnetic line of force of iron core end face is dispersed to surrounding, thus can at iron core transverse kernel of section wheelbase from surperficial certain position, measured value when hall probe sensitive surface is parallel with iron core end face is as magnetic induction density B measured value, and the pass of magnetic induction density B and magnetic field intensity H is:
B＝μ
0H (5)
Based on above principle, when cross-sectional area S is certain, if the magnetic field intensity H that excitation mechanism 7 need be made to produce is larger, by increasing field power supply power or coil turn, or the R in flux circuit can be reduced
m(i.e. L
a), these two kinds of modes can effective increasing magnetic field H, but adopts and increase cost that field power supply power or coil turn reach larger magnetic field intensity and be far longer than and reduce the mode that magnetic resistance reaches larger magnetic field intensity.The present embodiment by carrying out particular design to excitation mechanism 7, thus shortens air gap L
a, finally can meet and can provide larger magnetic field intensity under identical field power supply power or coil turn situation, thus not need to increase field power supply power or coil turn and produce and meet magnetic field needed for electric energy meter interference test.
Existing for the general only employing of the excitation mechanism 7 in electric energy meter interference test device the first yoke 1, because the magnetic field in the flux circuit of the first yoke 1 and air gap composition needs to increase field power supply power or coil turn meets magnetic field needed for electric energy meter interference test for cost could produce, this mode complex structure, cost intensive.Therefore the present embodiment adds the L-type yoke 2 of the air gap in the flux circuit of reduction first yoke 1 generation on the basis of the first yoke 1, thus can provide the magnetic field meeting electric energy meter D.C. magnetic field interference test desirable strength under identical field power supply power or coil turn situation.First yoke 1 of the present embodiment and L-type yoke 2 also can adopt other combined shaped to coordinate, as long as L-type yoke 2 can reduce the air gap in the flux circuit of the first yoke 1 generation, the magnetic resistance of air gap in flux circuit are reduced.
Alternatively, the quantity of L-type yoke 2 is four, and four L-type yokes 2 are uniformly distributed along circumference in the plane perpendicular to the first yoke 1 axial direction.In order to better simulate the permanent magnet of prior art employing as Distribution Characteristic of Magnetic Field during DC magnetic field source, the present embodiment adopts circumferential equally distributed L-type yoke 2 in the plane of four edges perpendicular to the first yoke 1 axial direction, by arranging equally distributed four L-type yokes 2, the intensity and Distribution Characteristic of Magnetic Field that meet permanent magnet can be simulated completely.
The distribution of excitation mechanism 7 energy approximate simulation 50mm × 50mm magnetic field of permanent magnet of the present embodiment, and the electric energy meter disturbing magnetic field intensity 200 ± 30mT requirement mentioned in OIML R46 international recommendation can be reached.For the Distribution of Magnetic Field of approximate simulation 50mm × 50mm permanent magnet, the boss of 50mm wider than coil need be made.
Alternatively, current device is direct current standard source 3.The direct current standard source 3 of the present embodiment is traced to the source by High-precision standard resistance, standard voltmeter, and current precision is high, good stability, thus determines the high stability in magnetic field.By adopting direct current standard source 3 to excitation mechanism 7 exciting current, the regulation and control to magnetic field can be realized, when needing to realize the magnetic field required for electric energy meter D.C. magnetic field interference test, current value can be become according to magnetic field calibration coefficient conversion by direct current standard source 3, and outputing current to excitation mechanism 7, excitation mechanism 7 produces the magnetic field required for electric energy meter interference test.On the one hand, the mode adopting this kind to be regulated and controled magnetic field by electric current can be convenient, flexible provide the calibrating magnetic field that many groups are different for interference test, on the other hand, when after off-test, only needing to close direct current standard source 3 just can make the D.C. magnetic field of excitation mechanism 7 disappear, can not have an impact to people and equipment, coefficient of safety is high.
Alternatively, electric energy meter D.C. magnetic field generating means also comprises the magnetic field calibration device for calibrating electric energy meter D.C. magnetic field generating means.The magnetic field calibration device that the present embodiment adopts is standard teslameter, and standard teslameter comprises the hall probe for detecting magnetic field size.Direct current standard source 3 in the present embodiment is when applying certain electric current to excitation mechanism 7, and excitation mechanism 7 gives prominence to iron core end face can produce the magnetic field corresponding with this electric current.Owing to needing the magnetic field intensity exporting setting in actual tests process, so need to calibrate magnetic field.The present embodiment uses standard teslameter as magnetic field calibration standard scale, in the position of iron core transverse kernel of section wheelbase from surperficial 30mm, place hall probe and guarantee that probe sensitive surface is parallel with iron core end face, regulating electric current to export makes the magnetic field intensity of this position be 200mT, and calibrate, calibration data is kept in standard dc source equipment.According to the corresponding relation of electric current and the magnetic field intensity after calibration, exported with regard to adjustable magnetic fields size by equipment control button, realize this place's magnetic field intensity and adjust arbitrarily in 0 ~ 230mT.
Alternatively, the first yoke 1, L-type yoke 2 all adopt pure iron material to make.The present embodiment adopts pure iron material to make iron core and can avoid because clashing into the magnetic field intensity decline problem caused, and the magnetic field intensity adopting the excitation mechanism 7 of the present embodiment to produce can not be influenced by ambient temperature.
With reference to Fig. 3, according to another aspect of the present utility model, a kind of electric energy meter D.C. magnetic field interference test device is also provided, comprises: electric energy meter D.C. magnetic field generating means, electric energy meter calibrating apparatus 6 and host computer 8 as above; Host computer 8 is for giving the pre-set parameter of electric energy meter calibrating apparatus 6 transmission calibrating point and sending disturbing magnetic field intensity settings to the current device of electric energy meter D.C. magnetic field generating means; Electric energy meter calibrating apparatus 6, for being connected with tested electric energy meter 5, providing calibrating electric current and calibrating voltage to tested electric energy meter 5, and obtaining the error of tested electric energy meter 5; Electric energy meter D.C. magnetic field generating means is used for the disturbing magnetic field providing disturbing magnetic field intensity settings size to tested electric energy meter 5.Wherein, verification parameters comprises electric current, voltage, power factor (PF), frequency etc., and disturbing magnetic field intensity settings is for carrying out the disturbing magnetic field value required for the test of electric energy meter magnetic interference.
The electric energy meter D.C. magnetic field interference test device of the present embodiment, by host computer to the pre-set parameter of electric energy meter calibrating apparatus transmission calibrating point with to the current device of electric energy meter D.C. magnetic field generating means transmission disturbing magnetic field set point, solving existing electric energy meter D.C. magnetic field interference test can not the technical problem of automatic Verification, achieve the automatic Verification of interference test, improve automation and the intellectuality of electric energy meter D.C. magnetic field interference test.Particularly, host computer 8 sends disturbing magnetic field intensity settings to current device, current device provides the exciting current corresponding with disturbing magnetic field intensity settings to the excitation mechanism of electric energy meter D.C. magnetic field generating means, excitation mechanism thus produce the disturbing magnetic field of disturbing magnetic field as tested electric energy meter 5 of disturbing magnetic field intensity settings size, and this disturbing magnetic field size can regulate and control arbitrarily within the specific limits with host computer is given, electric energy meter calibrating apparatus 6 provides calibrating electric current and calibrating voltage to tested electric energy meter 5 simultaneously, and obtain the error of tested electric energy meter 5 under the disturbing magnetic field intensity size cases of setting.
Alternatively, electric energy meter calibrating apparatus 6 and current device include the RS232 communication interface for communicating with host computer 8.Alternatively, the present embodiment can also carry out communication by other communication modes such as mode such as RS485 or wireless telecommunications.
Require as AC220V/10A when needs carry out one piece of calibrating, power factor (PF) is 1.0, during the interference test of the single-phase electric energy meter of D.C. magnetic field 150mT, first project is examined and determine according to calibrating demand by host computer 8 Software Create, after starting calibrating, host computer 8 sends cautious pre-set parameter by RS232 communication to electric energy meter calibrating apparatus 6, electric energy meter calibrating apparatus 6 exports examines and determine voltage accordingly, calibrating electric current is to electric energy meter, and read electrical energy meter electricity energy impulse, host computer 8 sends field strength values by RS232 communication to direct current standard source 3 simultaneously, direct current standard source 3 becomes current value according to magnetic field calibration coefficient conversion, and output current to excitation mechanism 7, excitation mechanism 7 produces magnetic field, and affect the metering of electric energy meter.Host computer 8 reads corresponding error amount by electric energy meter calibrating apparatus 6, and after verification process completes, host computer 8 sends calibrating voltage, calibrating electric current, magnetic field intensity rz signal to relevant device.After calibrating terminates, automatically generate verification result form.Send verification parameters value to electric energy meter calibrating apparatus 6 by employing host computer 8 and send the full-automatic calibrating that disturbing magnetic field intensity settings can realize electric energy meter interference test to current device, improve automation and the intelligence degree of electric energy meter D.C. magnetic field interference test device.In addition, the host computer 8 of the present embodiment can also read the data of electric energy meter calibrating apparatus 6 and direct current standard source 3, store and management, and is printed as form, thus substantially increases calibrating efficiency.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (9)
1. an electric energy meter D.C. magnetic field generating means, is characterized in that, comprising:
Excitation mechanism (7) and the current device for providing exciting current to described excitation mechanism (7);
The first yoke (1) that described excitation mechanism (7) comprises strip structure and the coil (4) for inputting described exciting current be wrapped on described first yoke (1); It is characterized in that,
Described excitation mechanism (7) also comprises along at least one the L-type yoke (2) for the air gap in the flux circuit that reduces described first yoke (1) and produce perpendicular to circumference distribution in the plane of described first yoke (1) axial direction, and the end of described L-type yoke (2) and the end of described first yoke (1) connect and compose U-shaped structure.
2. electric energy meter D.C. magnetic field generating means according to claim 1, is characterized in that,
The quantity of described L-type yoke (2) is four, and four described L-type yokes (2) are along being uniformly distributed perpendicular to circumference in the plane of described first yoke (1) axial direction.
3. electric energy meter D.C. magnetic field generating means according to claim 2, is characterized in that,
Described current device is direct current standard source (3).
4. electric energy meter D.C. magnetic field generating means according to claim 3, is characterized in that,
Described electric energy meter D.C. magnetic field generating means also comprises the magnetic field calibration device for calibrating described electric energy meter D.C. magnetic field generating means.
5. electric energy meter D.C. magnetic field generating means according to claim 4, is characterized in that,
Described magnetic field calibration device adopts standard teslameter.
6. electric energy meter D.C. magnetic field generating means according to claim 5, is characterized in that,
Described standard teslameter comprises the hall probe in the magnetic field for detecting described electric energy meter D.C. magnetic field generating means.
7. electric energy meter D.C. magnetic field generating means according to claim 6, is characterized in that,
Described first yoke (1), described L-type yoke (2) all adopt pure iron material to make.
8. an electric energy meter D.C. magnetic field interference test device, is characterized in that, comprising:
Electric energy meter D.C. magnetic field generating means as described in as arbitrary in claim 1-7, electric energy meter calibrating apparatus (6) and host computer (8);
Described host computer (8) is for giving the pre-set parameter of described electric energy meter calibrating apparatus (6) transmission calibrating point and sending disturbing magnetic field intensity settings to the current device of described electric energy meter D.C. magnetic field generating means;
Described electric energy meter calibrating apparatus (6), for being connected with tested electric energy meter (5), providing calibrating electric current and calibrating voltage to described tested electric energy meter (5), and obtaining the error of described tested electric energy meter (5);
Described electric energy meter D.C. magnetic field generating means is used for the disturbing magnetic field providing described disturbing magnetic field intensity settings size to described tested electric energy meter (5).
9. electric energy meter D.C. magnetic field interference test device according to claim 8, is characterized in that,
Described electric energy meter calibrating apparatus (6) and described current device include the RS232 communication interface for communicating with described host computer (8).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104700977A (en) * | 2015-02-15 | 2015-06-10 | 长沙天恒测控技术有限公司 | Electric energy meter DC magnetic field generator and interference test device |
| CN108120952A (en) * | 2018-02-14 | 2018-06-05 | 国网江西省电力有限公司电力科学研究院 | A kind of electric energy meter stationary magnetic field influences experimental rig |
-
2015
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104700977A (en) * | 2015-02-15 | 2015-06-10 | 长沙天恒测控技术有限公司 | Electric energy meter DC magnetic field generator and interference test device |
| CN104700977B (en) * | 2015-02-15 | 2017-01-11 | 长沙天恒测控技术有限公司 | Electric energy meter DC magnetic field generator and interference test device |
| CN108120952A (en) * | 2018-02-14 | 2018-06-05 | 国网江西省电力有限公司电力科学研究院 | A kind of electric energy meter stationary magnetic field influences experimental rig |
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Granted publication date: 20150902 Termination date: 20170215 |