CN103346747A - Feedback and interference filter network used for electric energy meter electric fast transient pulse group detection - Google Patents
Feedback and interference filter network used for electric energy meter electric fast transient pulse group detection Download PDFInfo
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- CN103346747A CN103346747A CN2013102758777A CN201310275877A CN103346747A CN 103346747 A CN103346747 A CN 103346747A CN 2013102758777 A CN2013102758777 A CN 2013102758777A CN 201310275877 A CN201310275877 A CN 201310275877A CN 103346747 A CN103346747 A CN 103346747A
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Abstract
The invention relates to a feedback and interference filter network used for electric energy meter electric fast transient pulse group detection. The feedback and interference filter network is characterized by comprising two common mode choke coils, two shunt-wound 33nF filter capacitors and two series-wound 68nF filter capacitors, the two common mode choke coils are two 80uH inductors and two 33uH inductors, and the two series-wound 68nF filter capacitors are grounded. The interference filter network is applied to an electric energy meter electric fast transient pulse group noise-immunity test (current and voltage parts), can completely meet the current standard of electric energy meter detection, is concise, easy to implement, economical and reliable, and achieves the sharing of an electric energy meter electric fast transient pulse group testing device and other electronic product electric fast transient pulse group testing devices; wiring is convenient. Through the actual testing, the feedback and interference are both reduced by 70%-80%, and the network meets the current standard GB17215.211-2006 of the electric energy meter detection.
Description
Technical field
A kind of feedback interference filter network for the detection of electric energy meter electrical fast transient (eft) of the present invention belongs to electronic measuring technology field.
Background technology
At present, electrical fast transient (eft) simulation generating means is when carrying out test of kilo watthour meter, because the residual feedback interference ratio that this generating means produces big (have up to last hectovolt), make electric energy meter standard test device can not directly insert power input, although the method that can take in the past to count solves 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 makes counting more and more inconvenient, more and more inaccurate.The power input that electric energy meter standard test device is linked into impulse train simulation generating means is the basic method that addresses this problem, at present, there is the scientific research personnel to propose the electric energy meter electrical fast transient (eft) and detects experimental rig and test method, but in the operation of reality, should use cumbersome, therefore, study a simple feedback interference filter network, and it is constituted an electric energy meter electrical fast transient (eft) immunity to interference verifying attachment in conjunction with electric energy meter standard test device and impulse train simulation generating means, be of great practical significance and practical value.
Summary of the invention
The invention provides a kind of feedback interference filter network for the detection of electric energy meter electrical fast transient (eft), its residual feedback that electric energy meter electrical fast transient (eft) immunity to interference verifying attachment is produced is disturbed by filter network and is reduced within the scope that electric energy meter standard test device can allow, make electric energy meter electrical fast transient (eft) immunity experiment carry out smoothly, satisfy 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 for the detection of electric energy meter electrical fast transient (eft), it is characterized in that: the filter capacitor that comprises the 68nF of the filter capacitor of 33nF of two common mode chokes, two parallel connections and two series connection, described two 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 the electric energy meter electrical fast transient (eft) immunity experiment, can satisfy the current standard that electric energy meter detects fully, succinct easily row, economical reliable, easy-to-connect has been realized sharing of electric energy meter electrical fast transient (eft) testing equipment and other electronic product electrical fast transient (eft) testing equipments.By reality test, the feedback interference 70%-80% that all descends has satisfied the current standard GB 17215.211-2006 that electric energy meter detects.
Description of drawings
The present invention is further described below in conjunction with accompanying drawing.
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;
Among the 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
The present invention is further described below in conjunction with embodiment.The present invention is by analyzing for electric energy meter electrical fast transient (eft) immunity experiment, common mode network and differential mode network configuration have been provided by calculating, the concrete parameter of electric capacity and inductance, and with common mode and differential mode filter network merging composition feedback interference filter network, accompanying drawing 3 is a kind of feedback interference filter network for the detection of electric energy meter electrical fast transient (eft), it is characterized in that: comprise two common mode chokes, the filter capacitor 2 of the filter capacitor 1 of the 33nF of two parallel connections and the 68nF of two series connection, described two 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 seen Fig. 3.
Filter is divided into common mode and differential mode interference difference designing filter, two integrated feedback interference filter networks of filter.
(1) common-mode filter
Common-mode filter is selected common-mode filter inductance and the topological structure that noise directly links to each other, and is common-mode filter equivalent circuit diagram of the present invention as Fig. 1.
For this circuit topology, can obtain the maximum of noise source impedance by measurements and calculations, and design common-mode filter according to this maximum.
A wherein
TBe frequency F
0Corresponding decay, f
0Be common-mode filter respective frequencies F
0Corner frequency.Obtain the size of the corner frequency of each frequency needs, and be worth to come the calculating filter device parameter values according to this.
The minimum corner frequency that can obtain the filter needs by mapping is 1.6KHz, draws the corresponding F of this corner frequency
0Be 450KHz, the filter device decays to 18 what this frequency need reach.
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 the common-mode filter inductance is 49 μ H, and for staying allowance, selecting inductance value for use is the common mode filtering inductance of 80 μ H.This moment, the equiva lent impedance of common mode filtering inductance was 370 Ω, was 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 for use, calculate through formula (2), leakage current is 2.28mA, meets the demands.
In the formula, f is power frequency 50Hz; C=2C
2Be common mode filtering electric capacity; U is capacitor C
2The voltage 110V that bears.
(2) differential mode filter
During the poor designs mode filter, the circuit topology of the same at first selected differential mode filter with the design common-mode filter, the circuit topology of differential mode filter is as shown in Figure 2.Can obtain the minimum value Z of noise source impedance by measurements and calculations
SDM, and come the poor designs mode filter according to this minimum value.The minimum corner frequency that reason can obtain differential mode filter is 1.5KHz, at this moment, and F
0Be 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 the differential mode noise source may impedance be 5 Ω, and the differential mode filter inductance that design is selected for use is 33 μ H, and the differential mode filter electric capacity of selecting for use is 33nF, obtains decaying to 8 by counter pushing away, and design meets the requirements.
(3) feedback interference filter network
Differential mode and the common-mode filter of design are merged into a filter network, circuit diagram such as Fig. 3.Because the magnetic core magnetic permeability that uses is lower, so made two common mode chokes, to increase inductance value, improve the work effect of choke.Will note the placement location of components and parts when making sample, components and parts will be placed to a direction according to circuit structure, under the condition of space permission, keep certain distance between electric capacity and the inductance as far as possible.The lead-in wire of each element will be lacked simultaneously, between reducing mutually, disturb, and be the filter network circuit diagram as Fig. 3.
Have the interference of radiation like this concurrently for electrical fast transient (eft), isolation and the shielding of filter turnover line are very important.So filter preferably is installed on the 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 the electric energy meter electrical fast transient (eft) immunity experiment, can satisfy the current standard that electric energy meter detects fully, succinct easily row, economical reliable, easy-to-connect has been realized sharing of electric energy meter electrical fast transient (eft) testing equipment and other electronic product electrical fast transient (eft) testing equipments.By reality test, the feedback interference 70%-80% that all descends has satisfied the current standard GB 17215.211-2006 that electric energy meter detects.
Claims (1)
1. one kind is used for the feedback interference filter network that the electric energy meter electrical fast transient (eft) detects, it is characterized in that: the filter capacitor (2) that comprises the 68nF of the filter capacitor (1) of 33nF of two common mode chokes, two parallel connections and two series connection, described two 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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| CN201310275877.7A CN103346747B (en) | 2013-07-03 | 2013-07-03 | Feedback interference filter network in detecting for electrical energy meter electricity Clusters |
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| CN201310275877.7A CN103346747B (en) | 2013-07-03 | 2013-07-03 | Feedback interference filter network in detecting for electrical energy meter electricity Clusters |
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| CN103346747B CN103346747B (en) | 2016-02-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106932748A (en) * | 2016-09-18 | 2017-07-07 | 北京市计量检测科学研究院 | Electric energy meter tests means for anti-jamming |
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| US5083101A (en) * | 1990-01-03 | 1992-01-21 | Integrated Power Components | Integrated electromagnetic interference filter |
| CN201450490U (en) * | 2009-09-14 | 2010-05-05 | 宝鸡市瑞通电器有限公司 | Two-section low pass filter |
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| CN203396941U (en) * | 2013-07-03 | 2014-01-15 | 山东省计量科学研究院 | Feedback interference filtering network used in electric energy meter electrical fast transient detection |
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2013
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5083101A (en) * | 1990-01-03 | 1992-01-21 | Integrated Power Components | Integrated electromagnetic interference filter |
| CN201450490U (en) * | 2009-09-14 | 2010-05-05 | 宝鸡市瑞通电器有限公司 | Two-section low pass filter |
| CN202149659U (en) * | 2011-03-31 | 2012-02-22 | 合肥美的荣事达电冰箱有限公司 | Refrigerator |
| CN203396941U (en) * | 2013-07-03 | 2014-01-15 | 山东省计量科学研究院 | Feedback interference filtering network used in electric energy meter electrical fast transient detection |
| CN103396941A (en) * | 2013-08-17 | 2013-11-20 | 孔远萍 | Novel domestic biogas digester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106932748A (en) * | 2016-09-18 | 2017-07-07 | 北京市计量检测科学研究院 | Electric energy meter tests means for anti-jamming |
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