CN206757026U - A kind of electronic electric energy meter electrical fast transient (eft) immunity test system - Google Patents
A kind of electronic electric energy meter electrical fast transient (eft) immunity test system Download PDFInfo
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- CN206757026U CN206757026U CN201720159558.3U CN201720159558U CN206757026U CN 206757026 U CN206757026 U CN 206757026U CN 201720159558 U CN201720159558 U CN 201720159558U CN 206757026 U CN206757026 U CN 206757026U
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Abstract
It the utility model is related to a kind of electronic electric energy meter electrical fast transient (eft) immunity test system, including electric energy meter checking device, fast-pulse group's generator, I I current loops, U U voltage circuits, sampled signal loop, the current interface of described electric energy meter checking device is connected by I I current loops with tested electric energy meter, the voltage interface of described electric energy meter checking device is connected by U U voltage circuits with tested electric energy meter, described fast-pulse group's generator is arranged on U U voltage circuits, described electric energy meter checking device is connected by sampled signal loop with tested electric energy meter, the system also includes being serially connected in I I current loops respectively, isolator on U U voltage circuits and sampled signal loop.Compared with prior art, the utility model has the advantages that removal interference, accuracy of detection are high.
Description
Technical field
Electric energy meter electromagnetic compatibility immunity automatization testing technique field is the utility model is related to, more particularly, to a kind of electricity
Minor electrical energy meter electricity Clusters immunity test system.
Background technology
Existing electric energy meter electromagnetic compatibility immunity automatization test system by standard scale, electric energy meter, U-U voltage circuits,
I-I current loops and sampled signal loop composition, its method of testing are：
First, electric energy meter during harassing and wrecking is not added to need to measure under the conditions of rated voltage and rated current and power factor is 1
Go out an error；Then, add and measure a mistake again under the conditions of rated voltage and rated current and power factor is 1 during harassing and wrecking
Difference；The difference for calculating two errors judges whether to meet the requirements.
But problems with occurs when carrying out the test of Clusters immunity to interference：
Generally, the sensitivity of standard scale is higher than the sensitivity of tested electric energy meter.However, when right in this tester
When tested electric energy meter adds interference signal, this interference signal also enters the electric current even voltage circuit of standard scale simultaneously, to mark
Quasi- table causes to disturb in real time.When standard scale is because disturbed and during cisco unity malfunction, that calibration function this moment will be lost, sternly
The precision of standard scale is lowered during weight or even the measuring system of table is damaged.
Utility model content
The purpose of this utility model be exactly in order to provided the defects of overcoming above-mentioned prior art to exist it is a kind of remove interference,
The high electronic electric energy meter electrical fast transient (eft) immunity test system of accuracy of detection.
The purpose of this utility model can be achieved through the following technical solutions：
A kind of electronic electric energy meter electrical fast transient (eft) immunity test system, including it is electric energy meter checking device, fast
Fast group pulse generator, I-I current loops, U-U voltage circuits, sampled signal loop, the electricity of described electric energy meter checking device
Stream interface is connected by I-I current loops with tested electric energy meter, and the voltage interface of described electric energy meter checking device passes through U-U electricity
Push back road to be connected with tested electric energy meter, described fast-pulse group's generator is arranged on U-U voltage circuits, described electric energy meter
Calibration equipment is connected by sampled signal loop with tested electric energy meter, and the system also includes being serially connected in I-I current loops, U- respectively
Isolator on U voltage circuits and sampled signal loop.
Described isolator include be serially connected on I-I current loops electric current isolator, be serially connected in U-U voltage circuits
On voltage isolator and the sampling isolator that is serially connected on sampled signal loop.
When sampled signal loop carries out signal sampling using photometer head, sampling isolator is nickel zinc magnet ring.
Described nickel zinc magnet ring is set on the connecting line in sampled signal loop every 30 centimetres of concatenations.
Described I-I current loops, the input line of U-U voltage circuits and sampled signal loop and the spacing of output line is more than
10 centimetres, and arrange in a non-parallel manner.
It is 30MHz-200MHz that described electric current isolator and voltage isolator, which has the frequency range of insertion loss,
The scope of filtering interference signals is 200MHz-2GHz.
Described electric energy meter checking device is standard electric energy meter.
Compared with prior art, the utility model has advantages below：
The utility model is carrying out the fast transient pulse of error metric according to electric energy meter relevant criterion by case verification
During group's immunity experiment, electromagnetic compatible protective is provided for tester using the utility model device, eliminates and tested
Clusters are disturbed the precision of standard scale in journey, and tester can meet normal when 6kV impulse disturbances are tested
Work.
Brief description of the drawings
Fig. 1 is apparatus structure schematic diagram of the present utility model.
Fig. 2 is the frequency domain characteristic curve map of quick disturbing pulse group.
Wherein, 1, electric energy meter checking device, 2, fast-pulse group's generator, 3, I-I current loops, 4, U-U voltage circuits,
5th, sampled signal loop, 61, electric current isolator, 62, voltage isolator, 7, tested electric energy meter.
Embodiment
The utility model is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment：
It can be regarded as by any EMC systems of Electro Magnetic Compatibility principle：It is (quick by harassing source, coupling path and receiver
Inductive circuit) composition, here it is the three elements that system EMC is analyzed for harassing and wrecking source, coupling path and sensitive circuit.
By taking the test of electrical energy meter electricity Clusters immunity to interference as an example：After voltage circuit and auxiliary line add reference voltage
Master meter is caused to be interfered cisco unity malfunction, so as to cause test not carry out.
In this system：Harassing and wrecking source is interference signal generator；Coupling path is voltage, electric current, sampled signal loop
And other coupling channels；Sensitive circuit is master meter.
Obviously, it is impossible for reducing harassing and wrecking source signal in such a system；Because the measuring accuracy of master meter is higher than
The measuring accuracy of measured object, therefore its sensitivity is also higher than tested table, the method for reducing master meter sensitivity is also inadvisable
's.Unique method is to go to consider a problem from coupling circuit, master meter must be protected by systems, can just reach system
Electro Magnetic Compatibility.
The interference characteristic of electrical fast transient (eft) is made up of three parts：First, the amplitude size of impulse train；Second, pulse
Rise time；Third, coupling path.
The coupling path of disturbing pulse：The coupling network of tester；Voltage circuit lead；Current loop lead；Sampling
Signal circuit lead；Other coupling paths are (such as：Space radiation etc.).
As shown in Fig. 2 figure is the frequency domain characteristic curve map of quick disturbing pulse group, and in figure, the frequency of first turning point
For：F1=1/ (3.14Td)=6MHz；The frequency of second turning point is：F2=1/ (3.14Tr)=60MHz.This explanation EFT
Influence frequency domain it is larger, EFT sources are provided simultaneously with radiation effect.
The pulse response time of acceptor circuit active device, by the junction capacity Cb of semiconductor devices (such as amplifier) and its
Blocked impedance parameter Z (such as equivalent capacity, resistance parameter Z=R-1/j ω C), distribution impedance parameter Z0 (such as distribution capacity on periphery
Parameter Z0=R0-1/j ω C0) determine.Pulse response time can be represented by τ=0.63 (Σ R, R0) (Σ Cb, C C0).
From above formula：When the normalized Two-port netwerk transmission network of disturbing pulse, as long as its rise time t is less than τ,
Or the time that disturbing pulse amplitude (such as 3V) is established is more than τ, we can improve the anti-interference of receiver with appropriate mode
Ability.I.e. when t is less than τ, after disturbing pulse on the PN junction of semiconductor devices input, enough interference can not be established
Amplitude (such as less than 3V), the original state of semiconductor devices is constant in the case.When t is more than τ, we can pass through acquisition
Minimum detectable signal, to clamp down on the upset of the PN junction of semiconductor devices input, semiconductor devices reality output shape is kept so as to reach
State it is constant.
So the mechanism of immunity to interference interference is charging of the pulse to semiconductor devices junction capacity in circuit, when junction capacity
Energy accumulation to a certain extent, will cause the malfunction of circuit.
Pass through the quantification and qualification to test system, it is believed that electric energy meter electromagnetic compatibility immunity test calibration system
System guard technology key point be：Whether interference letter loop is controlled.
For the very different present situation of the current all kinds of anti-interference levels of tester, to reach to the effective protection of tester
Purpose, this project group specially have developed power supply, sampled signal loop, voltage circuit, current loop high frequency decoupling network
Series and signal isolation module etc..
The characteristic of disturbing pulse is a vector, and disturbing pulse not only influences test item simultaneously but also with penetrating by conducting
Frequency characteristic, test item is disturbed by the form of space radiation.Therefore, emc testing is surveyed more particularly to radiofrequency signal
Examination proposes strict requirements to experiment arrangement.In electric energy meter electromagnetic compatibility immunity test meter correcting system guard system, together
Sample will pay attention to the riding position of decoupling network.It facts have proved：Same decoupling network is placed on diverse location, then it is played
Effect be it is widely different, sometimes even event resolves, immunity to interference test in, with reference to ground connection flat board ground connection it is whether reliable,
The operating efficiency of decoupling network will be directly affected.
Position when Clusters immunity to interference is tested makes sensitivity as shown in figure 1, under equal comparable conditions
Circuit is away from the key that interference source is problem.Therefore, success or not of the test arrangement to experiment plays an important role.Input,
Output line is disposed distally to more than 10 centimetres, and avoids parallel wiring as far as possible.To current loop, voltage circuit even meter correcting system
Power line carry out concatenate decoupling network be protected by.Specific guard method is：Gone for current loop using current loop
Coupling network；Voltage circuit decoupling network is used for voltage circuit single-phase electric energy meter.With two-port network when decoupling network uses
Mode concatenate into entry loop standard scale be protected by.
The characteristic of isolator：
It is 1. non-isolated；
2. there is larger insertion loss between 30MHZ-200MHZ frequencies, have to 200MHZ-2GHZ interference signals and substantially filter out
Effect；
3. normal power supply supply and signal transmission can not be influenceed；
For the foregoing reasons, the network design into functionally can be combined, in performance targetedly, believe for common DM EMI
Number there is the filter network of fine filtration result.
When signal sampling loop is wire connection sampling, need to concatenate signal sampling loop decoupling network in this loop
It is protected by；When carrying out signal sampling using photometer head, need to make at interval of 30 centimetres of strings on the connecting line after photoelectricity sampling
Connect the high frequency decoupling processing of Ni-Zn nickel zinc magnet rings.For the power supply of standard scale, if using with the same power supply of group pulse generator
When, also to consider to concatenate electric power loop decoupling network in its current supply circuit, independently-powered standard scale can be gone without electric power loop
Coupling network.
Claims (7)
1. a kind of electronic electric energy meter electrical fast transient (eft) immunity test system, including it is electric energy meter checking device (1), fast
Fast group pulse generator (2), I-I current loops (3), U-U voltage circuits (4), sampled signal loop (5), described electric energy meter
The current interface of calibration equipment (1) is connected by I-I current loops (3) with tested electric energy meter (7), described electrical energy meter calibration dress
The voltage interface for putting (1) is connected by U-U voltage circuits (4) with tested electric energy meter (7), described fast-pulse group's generator
(2) it is arranged on U-U voltage circuits (4), described electric energy meter checking device (1) passes through sampled signal loop (5) and tested electricity
Energy table connection, it is characterised in that the system also includes being serially connected in I-I current loops (3), U-U voltage circuits (4) and sampling respectively
Isolator on signal circuit (5).
2. a kind of electronic electric energy meter electrical fast transient (eft) immunity test system according to claim 1, it is special
Sign is, electric current isolator (61) that described isolator includes being serially connected on I-I current loops (3), is serially connected in U-U electricity
Push back the voltage isolator (62) on road (4) and the sampling isolator being serially connected on sampled signal loop (5).
3. a kind of electronic electric energy meter electrical fast transient (eft) immunity test system according to claim 2, it is special
Sign is that, when sampled signal loop (5) carry out signal sampling using photometer head, sampling isolator is nickel zinc magnet ring.
4. a kind of electronic electric energy meter electrical fast transient (eft) immunity test system according to claim 3, it is special
Sign is that described nickel zinc magnet ring is set on the connecting line of sampled signal loop (5) every 30 centimetres of concatenations.
5. a kind of electronic electric energy meter electrical fast transient (eft) immunity test system according to claim 1, it is special
Sign is, described I-I current loops (3), the input line of U-U voltage circuits (4) and sampled signal loop (5) and output line
Spacing is more than 10 centimetres, and arranges in a non-parallel manner.
6. a kind of electronic electric energy meter electrical fast transient (eft) immunity test system according to claim 2, it is special
Sign is that the frequency range of described electric current isolator (61) and voltage isolator (62) with insertion loss is 30MHz-
200MHz, the scope of filtering interference signals is 200MHz-2GHz.
7. a kind of electronic electric energy meter electrical fast transient (eft) immunity test system according to claim 1, it is special
Sign is that described electric energy meter checking device (1) is standard electric energy meter.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106772210A (en) * | 2017-02-22 | 2017-05-31 | 国网上海市电力公司 | A kind of electronic electric energy meter electrical fast transient (eft) immunity test system |
| CN111983368A (en) * | 2020-08-27 | 2020-11-24 | 扬芯科技(深圳)有限公司 | Automatic test system and method for pulse immunity |
-
2017
- 2017-02-22 CN CN201720159558.3U patent/CN206757026U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106772210A (en) * | 2017-02-22 | 2017-05-31 | 国网上海市电力公司 | A kind of electronic electric energy meter electrical fast transient (eft) immunity test system |
| CN111983368A (en) * | 2020-08-27 | 2020-11-24 | 扬芯科技(深圳)有限公司 | Automatic test system and method for pulse immunity |
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