CN204462373U - A kind of load Auto-matching instrument of electric energy meter direct current even-order harmonic test - Google Patents
A kind of load Auto-matching instrument of electric energy meter direct current even-order harmonic test Download PDFInfo
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- CN204462373U CN204462373U CN201520182663.XU CN201520182663U CN204462373U CN 204462373 U CN204462373 U CN 204462373U CN 201520182663 U CN201520182663 U CN 201520182663U CN 204462373 U CN204462373 U CN 204462373U
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- 238000012360 testing method Methods 0.000 title claims abstract description 21
- 238000005070 sampling Methods 0.000 claims abstract description 30
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- 238000003199 nucleic acid amplification method Methods 0.000 claims description 15
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- 238000009863 impact test Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
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Abstract
The load Auto-matching instrument that the utility model provides a kind of electric energy meter direct current even-order harmonic to test, comprises the interface module, power module and the matching module that are connected with communication display module respectively; Matching module comprises the first sampling resistor, the second sampling resistor and balance impedance unit; Balanced impedance unit is connected in parallel on the two ends of power meter unit to be measured; First sampling resistor accesses the output terminal of power meter unit to be measured, the output terminal of the second sampling resistor access balanced impedance unit.Compared with prior art, the load Auto-matching instrument of a kind of electric energy meter direct current even-order harmonic test that the utility model provides, adopt matching module Auto-matching, can get rid of interference that the is artificial and mode of connection, test stability, reliability are strengthened greatly.
Description
Technical field
The utility model relates to a kind of load matching device, is specifically related to the load Auto-matching instrument of a kind of electric energy meter direct current even-order harmonic test.
Background technology
Along with the widespread use of Power Electronic Technique on each industrial sector and consumer, nonlinear-load quantity gets more and more, and capacity is also increasing, and harmonic wave injects electrical network in a large number, makes power system voltage, serious distortion occurs current waveform.Because most of instrument, instrument are for power frequency sine wave design, thus cause designation data incorrect.Electric energy metrical is the foundation that electrical network economy is adjusted, and the measuring accuracy of electric energy is directly connected to economic benefit and the social benefit of power supply and demand both sides.Guarantee that accurate, the reliable tool of electric energy metrical is of great significance.Electric energy meter is the core of electric energy metrical and basic measurer, and its accuracy of measuring is directly connected to the precision of electric energy metrical.Therefore in the verification process of electric energy meter, there are direct current and even-order harmonic impact test, are used as one of method judging measuring accuracy of electric energy meter with this.
According to measurement standard requirement, carry out direct current even-order harmonic test time need access one tunnel load matched end, its impedance should with taken temperature completely the same.When doing direct current and even-order harmonic impact test on electric energy meter calibrating apparatus, load matched end was all adopt manually to debug balanced impedance, and can only examine and determine 1 electric energy meter at every turn, and not only not easily the match is successful to find out this kind of method thus, and inefficiency in the past.For the drawback occurred during current this test, propose a kind of electric energy meter direct current even-order harmonic load Auto-matching instrument, this device can the automatic adjustment impedance according to the difference of electric energy meter calibrating apparatus being examined and determine electric energy meter quantity, Rapid matching success, substantially increase calibrating efficiency, and the effective automaticity improving electric energy meter calibration.
Summary of the invention
In order to meet the needs of prior art, the utility model provides the load Auto-matching instrument of a kind of electric energy meter direct current even-order harmonic test, and described matching instrument comprises the interface module, power module and the matching module that are connected with communication display module respectively; Described matching module and the display module interactive communication that communicates;
Described matching module comprises the first sampling resistor, the second sampling resistor and balance impedance unit; Described balanced impedance unit is connected in parallel on the two ends of power meter unit to be measured; Described first sampling resistor accesses the output terminal of power meter unit to be measured, the output terminal of the second sampling resistor access balanced impedance unit;
Described balanced impedance unit comprises the balanced impedance of N number of series connection, and each balanced impedance two ends are all parallel with relay, and N is at least 2; Described power meter unit to be measured comprises the electric energy meter to be measured of M series connection, and M is at least 1.
Preferably, described matching module also comprises the electric energy computation chip, voltage comparator, filter amplification circuit and the scrambler that connect successively;
Described electric energy computation chip, gathers the voltage u at described first sampling resistor two ends
1with the voltage u at described second sampling resistor two ends
2, send voltage u to described voltage comparator
1voltage effective value U
1with voltage u
2voltage effective value U
2;
Described voltage comparator, sends described voltage effective value U to described filter amplification circuit
1with voltage effective value U
2voltage difference signal;
Described filter amplification circuit carries out filtering and amplification successively to described voltage difference signal;
Described scrambler, by filtering and amplify after voltage difference Signal coding be digital signal, and described digital signal is sent to described relay, relay carries out conducting or shutoff according to described digital signal, and adjustment is connected in parallel on the quantity of the balanced impedance at power meter unit two ends to be measured;
Preferably, described interface module, for connection standard power supply, the voltage comparator to described matching module provides the reference voltage of sampling;
Preferably, described communication display module comprises power light and matching status pilot lamp;
Described power light, is energized normal for display interface module and matching module;
Described matching status pilot lamp, for showing the duty of matching module, if relay conducting or matching status pilot lamp Chang Liang after turning off release, the work of signal matching module completes.
Compared with immediate prior art, excellent effect of the present utility model is:
1, in prior art, direct current even-order harmonic test load mating end adopts with tested electric energy meter same model electric energy meter matched impedance, the method is loaded down with trivial details and efficiency is lower, the load Auto-matching instrument of the electric energy meter direct current even-order harmonic test that the utility model provides, adopt matching module Auto-matching, can get rid of interference that the is artificial and mode of connection, test stability, reliability are strengthened greatly;
2, the load Auto-matching instrument that the electric energy meter direct current even-order harmonic that the utility model provides is tested, matching module adopts the strategy of contrast current effective value, and guaranteeing all can correctly matched load impedance when using any current source or mode of connection.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is further illustrated.
Fig. 1: the load Auto-matching instrument principle assumption diagram of a kind of electric energy meter direct current even-order harmonic test in the utility model embodiment;
Fig. 2: matching module principle assumption diagram in the utility model embodiment;
Fig. 3: the load Auto-matching instrument application drawing of a kind of electric energy meter direct current even-order harmonic test in the utility model embodiment;
Fig. 4: the load Auto-matching instrument front elevation of a kind of electric energy meter direct current even-order harmonic test in the utility model embodiment;
Fig. 5: the load Auto-matching instrument vertical view of a kind of electric energy meter direct current even-order harmonic test in the utility model embodiment;
Fig. 6: the load Auto-matching instrument side view of a kind of electric energy meter direct current even-order harmonic test in the utility model embodiment;
Fig. 7: the load Auto-matching instrument connection terminal schematic diagram of a kind of electric energy meter direct current even-order harmonic test in the utility model embodiment;
Wherein, 1: communication display module; 2: power module; 3: interface module; 4: matching module; 5: connection terminal; 6: attachment rail; 7: blower fan.
Embodiment
Be described below in detail embodiment of the present utility model, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the utility model, and can not be interpreted as restriction of the present utility model.
The utility model provides the load Auto-matching instrument of a kind of electric energy meter direct current even-order harmonic test, can according to the quantity of the automatic adjustment impedance of the difference of the quantity of tested electric energy meter, realize the automatic switchover of balanced impedance, avoid regulating manually, improve calibrating efficiency.
One, as shown in Figure 1, matching instrument comprises the interface module 3, power module 2 and the matching module 4 that are connected with communication display module 1 respectively; Wherein, matching module 4 and display module 1 interactive communication that communicates.
(1), matching module
Comprise the first sampling resistor, the second sampling resistor, balanced impedance unit, electric energy computation chip, voltage comparator, filter amplification circuit, scrambler and relay.
As shown in Figure 3, balanced impedance unit is connected in parallel on the two ends of power meter unit to be measured.First sampling resistor accesses the output terminal of power meter unit to be measured, the output terminal of the second sampling resistor access balanced impedance unit.Power meter unit to be measured comprises the electric energy meter to be measured of M series connection, and M is at least 1.
As shown in Figure 2, electric energy computation chip, voltage comparator, filter amplification circuit are connected successively with scrambler.
1, sampling resistor
As shown in Figure 3, the current signal that the first sampling resistor exports for gathering power meter unit to be measured, the current signal that the second sampling resistor exports for gathering balanced impedance unit.
2, balanced impedance unit
Balanced impedance unit comprises the balanced impedance of N number of series connection, and each balanced impedance two ends are all parallel with relay, and N is at least 2.By being turned on or off, relay changes the quantity being connected in parallel on the balanced impedance at power meter unit two ends to be measured.
3, electric energy computation chip
Gather the voltage u at the first sampling resistor two ends
1with the voltage u at the second sampling resistor two ends
2, send voltage u to voltage comparator
1voltage effective value U
1with voltage u
2voltage effective value U
2.
In the present embodiment, electric energy computation chip adopts electric energy computation chip HLW8012.
4, voltage comparator
To voltage effective value U
1with voltage effective value U
2continue difference comparsion, send voltage effective value U to filter amplification circuit
1with voltage effective value U
2voltage difference signal.
5, filter amplification circuit
Successively filtering and amplification are carried out to the voltage difference signal that voltage comparator sends.
6, scrambler
Be digital signal by filtering and the voltage difference Signal coding after amplifying, and digital signal is sent to relay, relay carries out conducting or shutoff according to digital signal, and adjustment is connected in parallel on the quantity of the balanced impedance at power meter unit two ends to be measured.
Technician can according to concrete working condition requirement, the preparation method of adjustment scrambler.
(2), interface module
For connection standard power supply, the voltage comparator to matching module 4 provides the reference voltage of sampling.
(3), communicate display module
Comprise power light and matching status pilot lamp, wherein,
1, power light, leads to 4 electricity for display interface module 3 and matching module normal.
2, matching status pilot lamp, for showing the duty of matching module 4, if relay conducting or matching status pilot lamp Chang Liang after turning off release, matching module 4 has worked.
Fig. 4-7 shows the concrete mounting structure of load Auto-matching instrument in the present embodiment, wherein power module 2, interface module 3 and matching module 4 are arranged in by plug-in unit and communicate on display module 1, and power module 2 provides power supply respectively to communication display module 1, interface module 3 and matching module 4.As shown in Figure 6, in matching module 4, be also provided with a blower fan 7, to dispel the heat to balanced impedance unit.As shown in Figure 7, matching module 4 comprises three-phase terminal, for connecting the output terminal of harmonic wave generating device, receives three-phase supply.
Two, when tested power meter unit and matching module 4 access A phase current, concrete testing process is:
1, as shown in Figure 3, harmonic wave generating device controls wholly-controled device D1 and wholly-controled device D2 conducting, intercept positive half cycle waveform IA+ and access tested power meter unit, negative half period waveform IA-accesses matching module 4, and the two combines formation backflow at the link of tested power meter unit and matching module 4.
2, matching module 4 is started, wherein:
(1) electric energy computation chip gathers the voltage effective value at the first sampling resistor two ends, and the voltage effective value at the second sampling resistor two ends.
(2) voltage comparator receives two-way voltage effective value signal, output voltage difference signal.
(3) filter amplification circuit carries out filtering and signal amplification to voltage difference signal.
(4) technician is according to requirement of actual working condition, the coding method of preset scrambler, encodes, obtain the digital signal of voltage difference signal, and this digital signal be sent in relay filtering and the signal after amplifying.
(5) relay is according to above-mentioned digital signal conducting or closed, thus corresponding balanced impedance is connected in parallel on power meter unit two ends to be measured or by corresponding balanced impedance short circuit, make the value of voltage difference signal be less than technician's voltage threshold preset in the preparation method of scrambler, reach the object that the resistance of balanced impedance unit is equal with the resistance of power meter unit to be measured.
Finally should be noted that: described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
Claims (4)
1. a load Auto-matching instrument for electric energy meter direct current even-order harmonic test, is characterized in that, described matching instrument comprises the interface module, power module and the matching module that are connected with communication display module respectively; Described matching module and the display module interactive communication that communicates;
Described matching module comprises the first sampling resistor, the second sampling resistor and balance impedance unit; Described balanced impedance unit is connected in parallel on the two ends of power meter unit to be measured; Described first sampling resistor accesses the output terminal of power meter unit to be measured, the output terminal of the second sampling resistor access balanced impedance unit;
Described balanced impedance unit comprises the balanced impedance of N number of series connection, and each balanced impedance two ends are all parallel with relay, and N is at least 2; Described power meter unit to be measured comprises the electric energy meter to be measured of M series connection, and M is at least 1.
2. load Auto-matching instrument as claimed in claim 1, it is characterized in that, described matching module also comprises the electric energy computation chip, voltage comparator, filter amplification circuit and the scrambler that connect successively;
Described electric energy computation chip, gathers the voltage u at described first sampling resistor two ends
1with the voltage u at described second sampling resistor two ends
2, send voltage u to described voltage comparator
1voltage effective value U
1with voltage u
2voltage effective value U
2;
Described voltage comparator, sends described voltage effective value U to described filter amplification circuit
1with voltage effective value U
2voltage difference signal;
Described filter amplification circuit carries out filtering and amplification successively to described voltage difference signal;
Described scrambler, by filtering and amplify after voltage difference Signal coding be digital signal, and described digital signal is sent to described relay, relay carries out conducting or shutoff according to described digital signal, and adjustment is connected in parallel on the quantity of the balanced impedance at power meter unit two ends to be measured.
3. load Auto-matching instrument as claimed in claim 1, it is characterized in that, described interface module, for connection standard power supply, the voltage comparator to described matching module provides the reference voltage of sampling.
4. load Auto-matching instrument as claimed in claim 1, it is characterized in that, described communication display module comprises power light and matching status pilot lamp;
Described power light, is energized normal for display interface module and matching module;
Described matching status pilot lamp, for showing the duty of matching module, if relay conducting or matching status pilot lamp Chang Liang after turning off release, the work of signal matching module completes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520182663.XU CN204462373U (en) | 2015-03-27 | 2015-03-27 | A kind of load Auto-matching instrument of electric energy meter direct current even-order harmonic test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520182663.XU CN204462373U (en) | 2015-03-27 | 2015-03-27 | A kind of load Auto-matching instrument of electric energy meter direct current even-order harmonic test |
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| Publication Number | Publication Date |
|---|---|
| CN204462373U true CN204462373U (en) | 2015-07-08 |
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|---|---|---|---|
| CN201520182663.XU Active CN204462373U (en) | 2015-03-27 | 2015-03-27 | A kind of load Auto-matching instrument of electric energy meter direct current even-order harmonic test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110187298A (en) * | 2019-05-30 | 2019-08-30 | 海盐星创电子有限公司 | A kind of the electronic load automatic patching system and its matching process of current loop |
-
2015
- 2015-03-27 CN CN201520182663.XU patent/CN204462373U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110187298A (en) * | 2019-05-30 | 2019-08-30 | 海盐星创电子有限公司 | A kind of the electronic load automatic patching system and its matching process of current loop |
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