CN203396941U - Feedback interference filtering network used in electric energy meter electrical fast transient detection - Google Patents
Feedback interference filtering network used in electric energy meter electrical fast transient detection Download PDFInfo
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- CN203396941U CN203396941U CN201320391710.2U CN201320391710U CN203396941U CN 203396941 U CN203396941 U CN 203396941U CN 201320391710 U CN201320391710 U CN 201320391710U CN 203396941 U CN203396941 U CN 203396941U
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- energy meter
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- feedback interference
- fast transient
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Abstract
The utility model relates to a feedback interference filtering network used in electric energy meter electrical fast transient detection. The feedback interference filtering network used in electric energy meter electrical fast transient detection is characterized in that the feedback interference filtering network used in electric energy meter electrical fast transient detection comprises two common-mode chokes, two 33nF filtering capacitors which are in parallel connection, and two 68nF filtering capacitors which are in series connection, wherein the two common-mode chokes are composed of two 80uH inductors and two 33uH inductors respectively, and the two 68nF filtering capacitors which are in series connection are grounded. The feedback interference filtering network of the utility model can be applied in electric energy meter electrical fast transient immunity test (current and voltage parts), and can completely satisfy current standards of electric energy meter detection. The feedback interference filtering network is advantageous in conciseness, high feasibility, economical property, reliability and convenient wiring, and can realize sharing between electric energy meter electrical fast transient test equipment and other electronic product fast transient test equipment. As actually tested, feedback interference is decreased by 70% to 80%, and the current standards of GB17215.211-2006 of electric energy meter detection can be satisfied.
Description
Technical field
A kind of feedback interference filter network detecting for electrical energy meter electricity Clusters of the present invention, belongs to electronic measuring technology field.
Background technology
At present, electrical fast transient (eft) simulation generator is when carrying out test of kilo watthour meter, the residual feedback interference ratio that produces due to this generating means large (have up to upper hectovolt), make electric energy meter standard calibrating device can not directly access power input, although can take in the past the method for counting to solve the problem of its error, but along with the enforcement of new standard (GB/T17215.211-2006), the time of test shortened to 1 minute by 10 minutes and makes counting more and more inconvenient, more and more inaccurate.The power input that electric energy meter standard calibrating device is linked into pulse train simulation generator is the basic method addressing this problem, at present, there is scientific research personnel to propose electrical energy meter electricity Clusters and detect test unit and test method, but in actual operation, should use cumbersome, therefore, study a simple feedback interference filter network, and it is formed to an electrical energy meter electricity Clusters immunity to interference verifying attachment in conjunction with electric energy meter standard calibrating device and pulse train simulation generator, be of great practical significance and practical value.
Summary of the invention
The invention provides a kind of feedback interference filter network detecting for electrical energy meter electricity Clusters, within its residual feedback that electrical energy meter electricity Clusters immunity to interference verifying attachment is produced is disturbed and is reduced to by filter network the scope that electric energy meter standard calibrating device can allow, electrical energy meter electricity Clusters immunity experiment is carried out smoothly, meet new standard (GB/T17
215.211-2006) requirement.
The present invention is achieved by the following technical solutions:
A kind of feedback interference filter network detecting for electrical energy meter electricity Clusters, it is characterized in that: the filter capacitor that comprises the filter capacitor of two common mode chokes, two 33nF in parallel and the 68nF of two series connection, two described common mode chokes are two 80uH inductance and two 33uH inductance, the filter capacitor ground connection of the 68nF of described two series connection.
With respect to prior art, the invention has the beneficial effects as follows: utilize interference filter network of the present invention, be applied to (electric current and voltage segment) in electrical energy meter electricity Clusters immunity experiment, can meet the act.std that electric energy meter detects completely, succinct easily row, economical reliable, easy-to-connect, has realized sharing of electrical energy meter electricity Clusters testing equipment and other electronic product electrical fast transient (eft) testing equipments.By reality, test, the feedback interference 70%-80% that all declines, has met the act.std GB 17215.211-2006 that electric energy meter detects.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1 is common-mode filter equivalent circuit diagram of the present invention;
Fig. 2 is differential mode filter equivalent circuit diagram of the present invention;
Fig. 3 is interference filter lattice network figure of the present invention;
In figure, the filter capacitor of 1-33nF, the filter capacitor of 2-68nF, the inductance of two 80uH of 3-, the inductance of two 33uH of 4-.
Embodiment
Below in conjunction with embodiment, the present invention is further described.The present invention is by analyzing for electrical energy meter electricity Clusters immunity experiment, by calculating, common mode network and differential mode network structure have been provided, electric capacity and inductance design parameter, and common and different mode filter network is merged and forms feedback interference filter network, accompanying drawing 3 is a kind of feedback interference filter network detecting for electrical energy meter electricity Clusters, it is characterized in that: comprise two common mode chokes, the filter capacitor 2 of the filter capacitor 1 of two 33nF in parallel and the 68nF of two series connection, two described common mode chokes are two 80uH inductance 3 and two 33uH inductance 4, filter capacitor 2 ground connection of the 68nF of described two series connection, concrete schematic diagram is shown in Fig. 3.
Wave filter is divided into common and different mode and disturbs designing filter respectively, two integrated feedback interference filter networks of wave filter.
(1) common-mode filter
The topological structure that common-mode filter selects common-mode filter inductance to be directly connected with noise, if Fig. 1 is common-mode filter equivalent circuit diagram of the present invention.
For this circuit topology, by measurements and calculations, can obtain the maximal value of noise source impedance, and design common-mode filter according to this maximal value.
A wherein
tfrequency F
0corresponding decay, f
0common-mode filter respective frequencies F
0corner frequency.Obtain the size of the corner frequency of each frequency needs, and be worth to come calculating filter device parameter values according to this.
The minimum corner frequency that can obtain wave filter by mapping needs is 1.6KHz, draws the corresponding F of this corner frequency
0for 450KHz, what wave filter device need to reach in this frequency decays to 18.
Determine the size of common-mode filter inductance.The maximum possible impedance in common-mode noise source is 75 Ω, and the equiva lent impedance of choosing common mode inductance is 3 times of noise source maximum impedance, i.e. 225 Ω.Calculating common-mode filter inductance is 49 μ H, and for staying allowance, selecting inductance value is the common mode filtering inductance of 80 μ H.Now the equiva lent impedance of common mode filtering inductance is 370 Ω, is far longer than the maximum possible value of common-mode noise source impedance.
Determine the size of common mode filtering electric capacity.The leakage current that the common-mode filter inductance of choosing produces can not surpass 5mA.If select the electric capacity of 33nF, through formula (2), calculate, leakage current is 2.28mA, meets the demands.
In formula, f is power frequency 50Hz; C=2C
2for common mode filtering electric capacity; U is capacitor C
2the voltage 110V bearing.
(2) differential mode filter
During poor designs mode filter, the circuit topology of first selected differential mode filter the same as design common-mode filter, the circuit topology of differential mode filter is as shown in Figure 2.By measurements and calculations, can obtain the minimum value Z of noise source impedance
sDM, and carry out poor designs mode filter according to this minimum value.The minimum corner frequency that reason can obtain differential mode filter is 1.5KHz, now, and F
0for 450KHz, the corresponding filter attenuation A of this frequency
tbe 8.
Determine the size of differential mode filter inductance and electric capacity.The minimum that mapping can obtain differential mode noise source may impedance be 5 Ω, and the differential mode filter inductance that design is selected is 33 μ H, and the differential mode filter electric capacity of selecting is 33nF, by being back-calculated to obtain, decays to 8, and design meets the requirements.
(3) feedback interference filter network
The differential mode of design and common-mode filter are merged into a filter network, and circuit diagram is as Fig. 3.Because the magnetic core magnetic permeability using is lower, so made two common mode chokes, to increase inductance value, improve the working effect of choking coil.When making sample, will note the placement location of components and parts, components and parts will be placed under the condition of ， space permission to a direction according to circuit structure, keep certain distance between electric capacity and inductance as far as possible.The lead-in wire of each element is short simultaneously, disturbs, if Fig. 3 is filtering netwok figure between reducing mutually.
For electrical fast transient (eft), have like this interference of radiation concurrently, the isolation and shield of wave filter line is very important.So wave filter is preferably arranged on casing, utilize the radiation of the housing shroud inlet wire of ground connection.
Utilize interference filter network of the present invention, be applied to (electric current and voltage segment) in electrical energy meter electricity Clusters immunity experiment, can meet the act.std that electric energy meter detects completely, succinct easily row, economical reliable, easy-to-connect, has realized sharing of electrical energy meter electricity Clusters testing equipment and other electronic product electrical fast transient (eft) testing equipments.By reality, test, the feedback interference 70%-80% that all declines, has met the act.std GB 17215.211-2006 that electric energy meter detects.
Claims (1)
1. the feedback interference filter network detecting for electrical energy meter electricity Clusters, it is characterized in that: the filter capacitor (2) that comprises the filter capacitor (1) of two common mode chokes, two 33nF in parallel and the 68nF of two series connection, two described common mode chokes are two 80uH inductance (3) and two 33uH inductance (4), the filter capacitor of the 68nF of described two series connection (2) ground connection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320391710.2U CN203396941U (en) | 2013-07-03 | 2013-07-03 | Feedback interference filtering network used in electric energy meter electrical fast transient detection |
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| CN201320391710.2U CN203396941U (en) | 2013-07-03 | 2013-07-03 | Feedback interference filtering network used in electric energy meter electrical fast transient detection |
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| CN203396941U true CN203396941U (en) | 2014-01-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346747A (en) * | 2013-07-03 | 2013-10-09 | 山东省计量科学研究院 | Feedback and interference filter network used for electric energy meter electric fast transient pulse group detection |
| CN105093162A (en) * | 2015-08-07 | 2015-11-25 | 国家电网公司 | Method and device for calibrating measurement error of electric energy meter under pulse train interference condition |
-
2013
- 2013-07-03 CN CN201320391710.2U patent/CN203396941U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346747A (en) * | 2013-07-03 | 2013-10-09 | 山东省计量科学研究院 | Feedback and interference filter network used for electric energy meter electric fast transient pulse group detection |
| CN103346747B (en) * | 2013-07-03 | 2016-02-03 | 山东省计量科学研究院 | Feedback interference filter network in detecting for electrical energy meter electricity Clusters |
| CN105093162A (en) * | 2015-08-07 | 2015-11-25 | 国家电网公司 | Method and device for calibrating measurement error of electric energy meter under pulse train interference condition |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140115 Termination date: 20140703 |
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