CN2916652Y - Electric power measuring cabinet testing device - Google Patents
Electric power measuring cabinet testing device Download PDFInfo
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- CN2916652Y CN2916652Y CN 200620116137 CN200620116137U CN2916652Y CN 2916652 Y CN2916652 Y CN 2916652Y CN 200620116137 CN200620116137 CN 200620116137 CN 200620116137 U CN200620116137 U CN 200620116137U CN 2916652 Y CN2916652 Y CN 2916652Y
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Abstract
The utility model is an electricity measuring cabinet testing device, which, besides a power amplifier, a voltage booster, and a current booster, also comprises at least a current virgule voltage converter, a voltage virgule voltage converter, a corresponding computer, and a corresponding A virgule D converter. The current booster is in serial connection with the current virgule voltage converter, and linked with the computer through the current virgule voltage converter and A virgule D converter; the voltage booster is in parallel connection with the voltage virgule voltage converter, and linked with the computer through the voltage virgule voltage converter and A virgule D converter. Software of the computer realizes tests of AC voltage, current, power, and phase and locks the measuring values so as to form a three-phase (or single phase) high voltage standard power source and a three-phase (or single-phase) electricity measuring instrument corresponding with the function and measuring range, which combine with each other to form a new proofreading and testing device.
Description
Technical field
The utility model relates to a kind of electric energy metrical cabinet verifying attachment, the particularly measurement and calibration of high-voltage electric energy measurement cabinet and high-voltage electric energy meter and calibrating installation.
Background technology
The electric energy metrical cabinet is most important electric energy measuring equipment, network interface electric energy measuring equipment particularly, and for a long time, the subject matter that its exists is to carry out whole measurement verification and calibration.Customary at present mode is to use the method for error synthesis to come the accuracy of this metering outfit of standard.For example highest ranking is that first-class electric energy metrical cabinet uses 0.2 grade current transformer, and the accuracy of the electric energy metrical cabinet that the electric energy meter of 0.2 grade voltage transformer (VT) and 0.2 grade is formed is a composition error 0.7%.According to the cardinal rule of International Electrotechnical Commission (IEC) about electric energy and calibrator for watt-hour meter regulation: " error of all instrument and measurement mechanism all must be carried out actual measurement; without measurement; only be calculate in measuring with other or quote the error of voltage, electric current and power factor combination; can not be as the foundation of evaluating apparatus fundamental error ", so 0.7% composition error of above-mentioned electric energy metrical cabinet can not be used to estimate the accuracy of electric energy metrical cabinet.Because technical reason does not also have a kind of equipment can realize the integral body of electric energy metrical cabinet is examined and determine and calibrated so far, a kind of its metering of measurement instrument result who does not have accuracy index or its accuracy index not to have maybe can not to implement objective measurement verification can not be as the foundation to user's charge, so electric energy metrical cabinet verifying attachment becomes the important blank that the electric energy metrical field exists for a long time according to the measurement Law of China.
On the other hand, used the induction type electric energy meter in more than 100 year, realize be electric current (typical ratings is 5A) and voltage (typical ratings is 220V, the 100V) ratio that obtains that multiplies each other in the power of its aluminium dish rotating speed, aluminium dish revolution carried out totally just can obtain electric energy meter degree.The expansion of its range then relies on current transformer CT and voltage transformer pt, and having formed one thus is core with the induction type electric energy meter, electric energy metrical that current transformer CT and voltage transformer pt are supporting for it and electric network measuring and controlling technical system.To the eighties in last century, because the high speed development of scientific-technical progress and IT industry, digital electronic electric energy meter based on the A/D technology has appearred, and the very fast trend that replaces induction type electric energy meter that formed, it is at the high-end induction type table that replaced fully at present, it is also very fast that the product low side replaces induction type watch progress, and the electronic watch of new production has at present surpassed the induction type table.What electronic electric energy meter was realized is multiplying each other of voltage and voltage, the corresponding techniques system should be that current/voltage (I/V) transducer and voltage/voltage (V/V) transducer are the voltage signal of A/D level match with input current and voltage transitions, and typical ratings is 1V, 2V.Continue to continue to use original voltage transformer pt, current transformer CT system, on the basis of 5A, 100V, obtain the voltage of A/D level again by sampling resistor and voltage divider, not only increase the complicacy of technology, increased cost, and influenced the accuracy of measuring and technical progress.
The utility model content
In order to address the above problem, a key issue in the network interface electric energy metrical particularly, be the measurement and calibration and the calibrating problem of electric energy metrical cabinet, its key is the innovative design that has proposed New type of current/voltage (I/V) transducer and voltage/voltage (V/V) transducer, just its core innovative technology is pin-point accuracy distribution voltage (400V～35kV) voltage/voltage changer and a pin-point accuracy, the wide range of linearity (0.1A～2000A, perhaps bigger) the current/voltage transducer, the electric energy metrical cabinet verifying attachment that manufactures based on these core technologies can improve the precision of measurement.
The technical solution adopted in the utility model is: a kind of electric energy metrical cabinet verifying attachment is provided, except that comprising D/A transducer, signal source, power amplifier, current lifting device and stepup transformer, also comprise current/voltage transducer, voltage/voltage changer, A/D transducer and microcomputer, described power amplifier is connected with described stepup transformer with described current lifting device respectively, and described current lifting device is successively by being connected to described microcomputer behind described current/voltage transducer and the A/D transducer corresponding with this current/voltage transducer; By being connected to microcomputer behind described voltage/voltage changer and the A/D transducer corresponding with this voltage/voltage changer, described microcomputer also is connected with described power amplifier by described D/A transducer, described signal source described stepup transformer successively successively.
Described electric energy metrical cabinet verifying attachment also comprises another current/voltage transducer, another voltage/voltage changer, A/D transducer and another microcomputer corresponding with both, described current lifting device is connected with this current/voltage transducer, and is connected to this microcomputer by this current/voltage transducer and corresponding with it A/D transducer successively; Described stepup transformer is in parallel with this voltage/voltage changer, and is connected to this microcomputer by described voltage/voltage changer and corresponding with it A/D transducer successively.
That is to say a kind of electric energy metrical cabinet verifying attachment, comprise D/A transducer, signal source, power amplifier, current lifting device and stepup transformer, described power amplifier is connected with described stepup transformer with described current lifting device respectively, it is characterized in that, this device also comprises at least one current/voltage transducer, at least one voltage/voltage changer, at least one A/D transducer and at least one microcomputer, and described current lifting device is successively by being connected to corresponding microcomputer behind described current/voltage transducer and the A/D transducer corresponding with this current/voltage transducer; Described stepup transformer connects successively by being connected to corresponding microcomputer behind described voltage/voltage changer and the A/D transducer corresponding with this voltage/voltage changer, and described microcomputer passes through successively also that described D/A transducer, described signal source are connected with described power amplifier separately.
For adapting to the development of above-mentioned Digital Measuring Technique, a kind of novel current/voltage (I/V) transducer and voltage/voltage (V/V) transducer are adopted in design of the present utility model, it is the voltage of A/D level with tested electric current and voltage Direct Transform, so just simplified original system design greatly, the accuracy and the range of linearity of electric energy and other parameter measurement of electrical network have been improved, carry electric current owing to avoided long distance, and replace voltage transmission under the utmost point low output impedance, thereby eliminated the error of introducing thus, and can increase transmission range, it will play a significant role in setting up new electric energy metrical and electric network measuring and controlling technical system.And the current/voltage transducer has the characteristic of pin-point accuracy, the wide range of linearity, low output resistance, can realize remote transmission; Voltage/voltage (V/V) transducer utilizes resitstance voltage divider that high pressure is converted to little electric current (rated current 2mA), be converted to voltage output through current/voltage (I/V) transducer again, its structure has realized the complete electricity isolation of high-pressure side and low-pressure side, thereby guarantees safety and antijamming capability with the measuring system terminal of its composition.And have because little, the lightweight advantage of their volumes.In addition, can realize measurement by the software function of microcomputer from definition to alternating voltage, electric current, power, phase place, and lock these values, thereby form a three-phase (or single-phase) high pressure calibration power source and corresponding, the corresponding three-phase of range (or single-phase) the ac electric quantity measuring instrument of function with it.Both are in conjunction with constituting the new electric energy metering cabinet verifying attachment that can implement whole measurement and calibration and calibrating to the electric energy metrical cabinet.
Description of drawings
Fig. 1 is the theory diagram of the utility model embodiment electric energy metrical cabinet verifying attachment (wherein the dotted line A-A in the middle of transducer 15, transducer 6, current lifting device 5, stepup transformer 11, transducer 12 and the transducer 17 represent former high-tension electricity between secondary isolate and shielding protection ground connection).
Fig. 2 is the theory diagram of the electric energy metrical cabinet verifying attachment of a kind of simplified design of the utility model embodiment.
Symbol description (summary)
Embodiment
First embodiment
Embodiment of the present utility model provides a kind of electric energy metrical cabinet verifying attachment, (reality is three-phase to its ultimate principle as shown in Figure 1, the phase of only drawing among the figure), electric energy metrical cabinet 22 among the figure, ((ratings is that 20A～1000A) is converted to electric current and the voltage with electric energy meter 21 couplings, and the total degree of electric energy then multiply by the no-load voltage ratio of voltage transformer (VT) 20 summation current transformers 19 for the electric energy meter measurement result for ratings 380V～35kV) and user's electric current with distribution voltage by voltage transformer (VT) 20 and current transformer 19.
A kind of electric energy metrical cabinet verifying attachment based on voltage/voltage (V/V) transducer and current/voltage (I/V) transducer, it is a core with microcomputer 1, connect D/A transducer 2 in turn, signal source 3 (the amplitude of this signal source, frequency, waveform and phase place may command), power amplifier 4, the input end of current transformer 19 in current lifting device 5 and the tested electric energy metrical cabinet 22, and present electric current to it, and connect simultaneously I/V transducer 6 and I/V transducer 15, wherein I/V transducer 6 is transformed to the voltage signal of suitable level exactly with the electric current of output, and this voltage signal is sent microcomputer 1 back to through 7 samplings of the A/D of pin-point accuracy transducer and with data in real time.Meanwhile, microcomputer 1 also connects D/A transducer 8 successively, signal source 9 (the amplitude of this signal source, frequency, waveform and phase place may command), power amplifier 10 and stepup transformer 11, an output terminal of this stepup transformer 11 respectively with tested electric energy metrical cabinet 22 in the input end of voltage transformer (VT) 20, an input end of input end of voltage/voltage (V/V) transducer 12 and V/V transducer 17 connects, another output terminal of stepup transformer 11 respectively with another input end of voltage transformer (VT) 20, another input end of another input end of voltage/voltage (V/V) transducer 12 and V/V transducer 17 connects.Output voltage is through pin-point accuracy voltage/voltage (V/V) transducer 12, the voltage signal that is transformed to suitable level is sent microcomputer 1 back to through High Accuracy A/D transducer 13 samplings and with data in real time, microcomputer 1 will be sampled ratio in the data set of output current and output voltage through A/D, realize output current I, voltage V and power by software function
The measurement from definition, and be locked (comprising the locking of frequency, waveform, amplitude, phase place) by D/A, form normalized current source and standard voltage source, form the calibration power source on the whole.And the electric current of output is connected to another microcomputer 14 through I/V transducer 15, A/D transducer 16.The voltage of output is connected to same microcomputer 14 through V/V transducer 17, A/D transducer 18.It is used with the same software function of microcomputer 1 and finishes measurement to its output current and voltage, constitutes a high-voltage alternating electric weight (comprising electric current, voltage, power/energy, phase place etc.) measurement instrument, and its effect is calibration and monitors above-mentioned calibration power source.And utilize the portable character of this table, can separate and then realize magnitude tracing to higher level's measurement technology mechanism with apparatus main body.
In other words, just this device comprises two parts, and first is the high pressure calibration power source that core constitutes with industrial computer 1, as shown in Figure 1.Its principle is that microcomputer 1 is successively by D/A transducer 8, signal source 9 (amplitudes, waveform, frequency and phase place may command), power amplifier 10 and stepup transformer 11, the output voltage (0～20kV or higher) that produces is voltage transformer (VT) 20 power supplies in the electric energy metrical cabinet voltage circuit, voltage/voltage (V/V) transducer 12 that output voltage acts on normal voltage/voltage (V/V) transducer 17 simultaneously and is used to feed back, ratio is returned microcomputer 1 in the voltage signal of output voltage by 13 samplings of A/D transducer, microcomputer calculates and locks output voltage by its software function from definition and (comprises frequency, amplitude, waveform, phase place), standard voltage source of whole loop formation.On the other hand, microcomputer 1 is successively by D/A transducer 2, signal source 3 (amplitudes, waveform, frequency and phase place may command), power amplifier 4 and current lifting device 5, output current (0～the 1000A that produces, or bigger) be current transformer 19 power supplies in the electric energy metrical cabinet current return, output current flows through normalized current/voltage (I/V) transducer 15 simultaneously, feedback current/voltage (I/V) transducer 6, ratio is returned microcomputer 1 in the voltage signal of output current by 7 samplings of A/D transducer, microcomputer 1 calculates and locks output current by its software function from definition and (comprises frequency, amplitude, waveform, phase place), normalized current source of whole loop formation.Standard voltage source and normalized current source constitute three-phase high-voltage calibration power source together.
Normalized current/voltage (I/V) transducer 15 and normal voltage/voltage (V/V) transducer 17 with ratio in the voltage signal of output current and output voltage by A/D transducer 16,18 samplings of A/D transducer and be connected to microcomputer 14, form a high pressure three-phase alternating voltage measurement instrument by current/voltage (I/V) transducer 15, voltage/voltage (V/V) transducer 17, A/D transducer 16, A/D transducer 18 and industrial computer 14, its effect is calibration and monitoring standard power source, and can break away from this device and serve one-level metrological service calibrating and trace to the source to realize measuring.
The electrical energy pulse that electric energy meter sends in the electric energy metrical cabinet and other information will be delivered to microcomputer 1 by 485 interfaces, and microcomputer 1 compares the standard electric energy of calibration power source output and the measurement result of electric energy metrical cabinet, realizes measurement and calibration or calibrating to the electric energy metrical cabinet.
Second embodiment
On the basis of above-mentioned new electric energy metering cabinet, remove with microcomputer 14 and be attached thereto A/D transducer, I/V transducer and the V/V transducer that connects, form another kind of electric energy metrical cabinet verifying attachment as shown in Figure 2.
The 3rd embodiment
On the basis of above-mentioned first, second embodiment, be verified object and change into high-voltage electric energy meter, or other voltages, current power converter, promptly constitute high-voltage electric energy meter or other voltage, electric current, power converter verifying attachment.
Though with specific embodiment the present invention is described, have the knack of this skill person will know clearly can claims define below not breaking away from spirit of the present invention and scope in implement variations and modifications.No matter but it does any variation on shape or structure, the modification that every employing present technique is made all drops within the protection domain of the present utility model.
Claims (2)
1. electric energy metrical cabinet verifying attachment, comprise D/A transducer, signal source, power amplifier, current lifting device and stepup transformer, described power amplifier is connected with described stepup transformer with described current lifting device respectively, it is characterized in that, this device also comprises current/voltage transducer, voltage/voltage changer, A/D transducer and microcomputer, and described current lifting device is successively by being connected to described microcomputer behind described current/voltage transducer and the A/D transducer corresponding with this current/voltage transducer; By being connected to microcomputer behind described voltage/voltage changer and the A/D transducer corresponding with this voltage/voltage changer, described microcomputer also is connected with described power amplifier by described D/A transducer, described signal source described stepup transformer successively successively.
2. electric energy metrical cabinet verifying attachment as claimed in claim 1, it is characterized in that, this device also comprises another current/voltage transducer, another voltage/voltage changer, A/D transducer and another microcomputer corresponding with both, described current lifting device is connected with this current/voltage transducer, and is connected to this microcomputer by this current/voltage transducer and corresponding with it A/D transducer successively; Described stepup transformer is in parallel with this voltage/voltage changer, and is connected to this microcomputer by described voltage/voltage changer and corresponding with it A/D transducer successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620116137 CN2916652Y (en) | 2006-05-16 | 2006-05-16 | Electric power measuring cabinet testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620116137 CN2916652Y (en) | 2006-05-16 | 2006-05-16 | Electric power measuring cabinet testing device |
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| Publication Number | Publication Date |
|---|---|
| CN2916652Y true CN2916652Y (en) | 2007-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620116137 Expired - Lifetime CN2916652Y (en) | 2006-05-16 | 2006-05-16 | Electric power measuring cabinet testing device |
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| CN (1) | CN2916652Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944774A (en) * | 2012-10-30 | 2013-02-27 | 上海晟东电力科技有限公司 | Automatic correction device and correction method for precision of analog quantity of power distribution terminal |
| CN102981083A (en) * | 2012-12-05 | 2013-03-20 | 江苏中凌高科技有限公司 | Self-calibration electric energy quality monitoring device |
| CN103376438A (en) * | 2013-06-28 | 2013-10-30 | 中国电力科学研究院 | Three-phase high-voltage large-current power source |
| CN104316897A (en) * | 2014-10-29 | 2015-01-28 | 上海德布森电气有限公司 | Detection device for three-phase multifunctional watt-hour meter |
| CN105607031A (en) * | 2016-03-23 | 2016-05-25 | 国网四川省电力公司电力科学研究院 | High-voltage electric energy meter calibrating device |
-
2006
- 2006-05-16 CN CN 200620116137 patent/CN2916652Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944774A (en) * | 2012-10-30 | 2013-02-27 | 上海晟东电力科技有限公司 | Automatic correction device and correction method for precision of analog quantity of power distribution terminal |
| CN102981083A (en) * | 2012-12-05 | 2013-03-20 | 江苏中凌高科技有限公司 | Self-calibration electric energy quality monitoring device |
| CN103376438A (en) * | 2013-06-28 | 2013-10-30 | 中国电力科学研究院 | Three-phase high-voltage large-current power source |
| CN104316897A (en) * | 2014-10-29 | 2015-01-28 | 上海德布森电气有限公司 | Detection device for three-phase multifunctional watt-hour meter |
| CN105607031A (en) * | 2016-03-23 | 2016-05-25 | 国网四川省电力公司电力科学研究院 | High-voltage electric energy meter calibrating device |
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| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20070627 |
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| EXPY | Termination of patent right or utility model |