CN1782730A - Integrate detecting and measuring method for metering property of high voltage power meter - Google Patents
Integrate detecting and measuring method for metering property of high voltage power meter Download PDFInfo
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- CN1782730A CN1782730A CN 200510012796 CN200510012796A CN1782730A CN 1782730 A CN1782730 A CN 1782730A CN 200510012796 CN200510012796 CN 200510012796 CN 200510012796 A CN200510012796 A CN 200510012796A CN 1782730 A CN1782730 A CN 1782730A
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Abstract
The integral detection and measurement method of metering performance of high voltage power meter belongs to the field of measurement technology. The method includes connecting high voltage voltage/current generator unit, voltage/current regulating unit, data comparator unit, control and data processing unit, and standard high voltage metering unit with the high voltage power meter to be measured; applying one sequence of voltage and current to the standard high voltage metering unit and the high voltage power meter to be measured to obtain one set of standard power values and one set of measured power values; comparing these two sets of power values in the data comparison unit and feeding the comparison results to the control and data processing unit; calculating the metering error based on the given formula and outputting the measurement results.
Description
Technical field
The invention belongs to fields of measurement, relate in particular to a kind of method that high-voltage electric-energy meter is examined and determine, measured of being used for.
Background technology
Electric energy as important energy source easy to use, that high-quality is clean, is the important motivity of the national economic development, is related to national economy, and is closely bound up with people's lives and industrial and agricultural production.
Along with improving constantly of expanding economy and living standards of the people, impel and send out, constantly increase for, power consumption; The dealing of electric energy and how to measure and calculate its value seems very important day by day.
Present electric energy metrical mainly carries out according to the measured continuous data of electric power meter; Do the gage work of electric energy well, correctly measure the use amount of electric weight, make metering numerical value more accurately, fair, just, directly have influence on send out, for, electricity consumption three parts's economic interests.
Electric power meter is the specialized equipment of electric energy metrical, because its use has a large amount of wide characteristics of face, except requiring its safety, reliable, stable performance, how to improve metering performance, reduce the self electric quantity loss, reduce volume, energy savings, economical with materials, reduce investment outlay, reduce measuring cost, Electro Magnetic Compatibility is good and environmental protection, prevent that power consumer from changing wiring privately and stealing, install and use problem such as maintenance side and just become the emphasis that the practitioner is studying always, paying close attention to.This just requires us to strengthen supervision and management, periodic check, makes regular check on, and brings in constant renewal in measuring apparatus.
Electric energy metrical is divided into high-voltage electric energy measurement and low-voltage electric energy metering usually, now the high pressure measurement mode of electric energy mainly adopt by voltage transformer (VT) with high-voltage variable change into standard low-voltage, change big electrorheological the little electric current of standard into by current transformer, more above-mentioned normal voltage/electric current is sent into electric energy meter and carries out electric energy metrical.
For the high voltage user, the metering of existing domestic and international high voltage electric energy, the calibrating of electric power meter with and the measurement of error, all be by current transformer (CT), voltage transformer (VT) (PT) or current/voltage combined instrument transformer (P/CT) and electric energy meter are carried out error measure or calibrating respectively, determine overall uncertainty γ ' (also claiming comprehensive uncertainty, i.e. the system synthesis error) then.
According to present existing computing formula, the system synthesis source of error of electric power meter mainly contains current transformer, voltage transformer (VT), electric energy meter error separately, has only composition error just can reflect the order of accuarcy of electric power meter.
The expression formula of its system synthesis error γ ' is as follows:
γ′＝r
0+γ
h+r
d
Wherein, r
0---the error of electric energy meter own, γ
h---the resultant error of mutual inductor, r
d---secondary circuit lead pressure drop error.
The computing formula of said system composition error γ ' is referring to the 140th page of " electric energy metrical " (China Electric Power Publishing House, 2004 July the 1st edition).
So, there is following several respects shortcoming:
(1) electric weight can not direct-reading, need take advantage of the multiplying power of current transformer, voltage transformer (VT), makes troubles to management work;
(2) the system synthesis error of whole electric power meter is caused by many-sides such as current transformer, voltage transformer (VT), electric energy meter, connection conductor resistance, contact resistances, and also can occur artificial uncertain factor in the subsequent installation anabolic process and cause error;
(3) owing to each side all considers towards the aspect that helps own interests, when the choosing of current transformer, voltage transformer (VT), electric energy meter, connection conductor resistance, contact resistance, the product of electric energy, confession, all error is selected to helping party of one's own with unit, the actual overall uncertainty in combination back is big, and the stoichiometric number value difference out-phase of being brought owing to the system synthesis error in the actual moving process is when big;
(4) error amount that causes of conductor resistance, contact resistance can not directly be measured;
(5) error of each unit of measurement/calculating high-voltage electric-energy meter respectively only, be unfavorable for the optimal design between each unit, be unfavorable for the technical progress of related industry, make that whole high-voltage electric-energy meter body volume is big, cost is high, power consumption is high, energy dissipation is serious, high material consumption, key is to improve very difficulty of measuring accuracy, and the composition error of the electric power meter reality after the installation can not directly be determined;
(6) each other connection conductor resistance of current transformer, voltage transformer (VT), electric energy meter, contact resistance and because output capacity and secondary circuit lead do not match caused pressure drop error do not take into account, and this part supplies, uses the focus of common interest just, being the excessive source of overall uncertainty γ ', is again immeasurability and uncertain factor.
In sum, the expression formula of the accurate system synthesis error γ of electric power meter should be as follows:
γ＝r
0+γ
h+r
d+r
j
Wherein, r
0---the error of electric energy meter own, γ
h---the resultant error of mutual inductor, r
d---secondary circuit lead pressure drop error, r
j---connect conductor resistance, contact resistance and caused pressure drop error because output capacity and secondary circuit lead do not match.
So existing calibrating to high-voltage electric-energy meter, measuring method all can't accurately, comprehensively reflect the accurate system synthesis error γ of electric power meter.
In a word, the composition error of electric energy metrical is excessive to be the key issue that electric energy metrical exists, it directly influences the electric industry generated energy, line loss, coal consumption, correct calculation for every electric weight technical economical indexes such as power consumptions, what business was chargeed holds water, along with power industry to big electrical network, high-power station, big unit, high voltage, high parameter, the realization of supermatic development and whole nation networking, the electric weight of its conveying is increasing, commercialization operation along with power industry, with the province is entity, net factory separates, between power plant and the electrical network, between the networking circuit, between power supply and the user, all will be by charge accounting, the contradiction that this problem is brought is more and more outstanding.
Therefore, making great efforts to improve the comprehensive accurately level of electric energy metrical, is an instant vital task.
Summary of the invention
Technical matters to be solved by this invention provides a kind of integral body calibrating of high-voltage electric-energy meter metering performance, measuring method, its high-voltage electric-energy meter is handled as a complete integral body, can carry out whole calibrating and measurement to the metering performance of high-voltage electric-energy meter, directly measure the actual error of tested high pressure energy measuring apparatus, this false drop has comprised each factor that causes error in the tested high-voltage electric-energy meter, it is big to have got rid of the caused comprehensive uncertainty of subsequent installation work, influence problems such as metering accuracy, having avoided the people is the error component that causes, reduced the uncertain factor that produces error, improved the overall accuracy of high-voltage electric-energy meter metering performance, made high-voltage electric energy measurement more accurate, rationally, just.
Technical scheme of the present invention is: a kind of integral body calibrating, measuring method of high-voltage electric-energy meter metering performance are provided, it is characterized in that:
(1) voltage output end that is used for the power supply that system provides is become the high tension voltage generating unit of measuring needed high tension voltage is connected with the voltage circuit of a high voltage electric energy standard metering unit and a tested high-voltage electric-energy meter respectively;
One current output terminal that is used for the power supply that system provides is become the high-voltage great-current generating unit of measuring needed high-tension current is connected with the current return of above-mentioned high voltage electric energy standard metering unit and tested high-voltage electric-energy meter respectively;
With above-mentioned high pressure voltage generating unit be connected with the high-voltage great-current generating unit output control terminal respectively through a voltage-regulation unit that be used for to regulate high pressure voltage generating unit output value with is connected the current regulation unit and that is used for regulating high-voltage great-current generating unit output value and is used for that the high pressure voltage generating unit is connected control that the output value detects, controls and can process the output data of data comparison unit and the corresponding control loop port of data processing unit with the high-voltage great-current generating unit and is connected;
The electric energy metrical parameter output terminal and one of above-mentioned high voltage electric energy standard metering unit and tested high-voltage electric-energy meter is used for the continuous data of high voltage electric energy standard metering unit compared with the continuous data of tested high-voltage electric-energy meter and provides the data input pin of the data comparing unit of processing signals to be connected respectively for control and data processing unit;
The data output end of above-mentioned data comparing unit is connected with the corresponding data input port of control and data processing unit;
(2) input end at high tension voltage generating unit and high-voltage great-current generating unit applies specified working power;
(3) control and data processing unit are adjusted to the output valve of high tension voltage generating unit and high-voltage great-current generating unit by voltage-regulation unit and current regulation unit and measure needed operating voltage/working current numerical value;
(4) control and data processing unit detect whether the output valve of high tension voltage generating unit and high-voltage great-current generating unit is the numerical value that needs;
(5) under the control of control and data processing unit, high tension voltage generating unit and high-voltage great-current generating unit apply the primary voltage Un of regulation and the sequential value of primary current In respectively to high voltage electric energy standard metering unit and tested high-voltage electric-energy meter, and keep a period of time respectively, to satisfy each needed time of point measurement electric energy;
(6) the tested energy value data that obtain one group of standard loop energy value that in high voltage electric energy standard metering unit, produces and in tested high-voltage electric-energy meter, produce;
(7) with above-mentioned standard loop energy value and tested energy value data successively respectively correspondence send into the data comparing unit and compare, comparative result is sent into control and data processing unit;
(8) control and data processing unit draw required measuring error number percent γ according to following formula:
(9) control and data processing unit are converted into tester's identifiable information form with measurement result and export, and in view of the above the metering performance of tested high-voltage electric-energy meter are carried out whole calibrating, measurement.
Wherein, the voltage circuit of the voltage output end of described high tension voltage generating unit and high voltage electric energy standard metering unit and tested high-voltage electric-energy meter is connected in parallel; The current return of the current output terminal of described high-voltage great-current generating unit and above-mentioned high voltage electric energy standard metering unit and tested high-voltage electric-energy meter is connected in series.
Its described high tension voltage/high-voltage great-current is three-phase or single-phase voltage/current.
Its described high voltage electric energy standard metering unit and tested high-voltage electric-energy meter are respectively the active energy of energy measurement high-voltage electric power circuit transmission and/or the measuring apparatus of reactive energy, and its high voltage electric energy standard metering unit is made of standard high-voltage current transformer, standard high-voltage voltage transformer (VT), phase shifter, standard electric energy meter and the connection line between it at least; Its tested high-voltage electric-energy meter is made of high-tension current inductor, high voltage potential transformer, electric energy meter and the connection line between it at least.
Described phase shifter can be regulated power factor cos ￠=1.0L, cos ￠=0.5L or cos ￠=0.8L.
Its described control and data processing unit are multi-purpose computer PC, the automatic control computer PLC of industrial process, digital signal processor circuit DSP, single chip microcontroller circuit SCM, microcontroller circuit MCU, programmable logic device circuit PLD/CPLD/FPGA or built-in PC circuit.
The rated operational voltage that its described primary voltage Un is high voltage electric energy standard metering unit and tested high-voltage electric-energy meter.
The rated operational voltage (Un can be respectively 3KV, 6KV, 10KV, 27.5KV, 35KV etc.) that its described primary voltage Un is high voltage electric energy standard metering unit and tested high-voltage electric-energy meter; The sequential value of described primary current In be high voltage electric energy standard metering unit and tested high-voltage electric-energy meter rated operational current 0.5%～120%.
The sequential value of above-mentioned primary current In is preferably 0.5%In, 1%In, 5%In, 10%In, 20%In, 100%In and 120%In.
Compared with the prior art, advantage of the present invention is:
1. high-voltage electric-energy meter is detected/tests as a complete integral body, simulate its practical operation situation, directly apply three-phase (or single-phase) high tension voltage/high-voltage great-current by high-pressure side at high voltage electric energy standard metering unit and tested high-voltage electric-energy meter, high-voltage electric-energy meter is carried out whole must the check and test, can rapidly, directly measure the actual whole error in dipping of tested high pressure energy measuring apparatus.
2. high-voltage electric-energy meter is detected/tests as a complete integral body, make high-voltage electric energy measurement more accurate, unmanned error component for causing.Reduced the uncertain factor of error, improved the accuracy of high-voltage electric energy measurement, made high-voltage electric energy measurement more accurate, reasonable, just.
3. whole detection/test process automation degree height, it is few to detect step, helps carrying out quickly and accurately the detection/test job of high-voltage electric-energy meter, increases work efficiency.
Description of drawings
The present invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the schematic flow sheet of whole detection/method of testing of the present invention;
Fig. 2 is the device connection side block diagram of whole detection of the present invention/test;
Fig. 3 is that the device of an embodiment connects wiring schematic diagram;
Fig. 4 is that the device of another embodiment connects wiring schematic diagram;
Fig. 5 is that the device of another embodiment connects wiring schematic diagram.
1 is the high tension voltage generating unit among the figure, and 2 is the high-voltage great-current generating unit, and 3 is the voltage-regulation unit, 4 is current regulation unit, and 5 is high voltage electric energy standard metering unit, and 6 is tested high-voltage electric-energy meter, 7 is the data comparing unit, and 8 are control and data processing unit.
Embodiment
Among Fig. 1, the concrete detection method and the step of this whole detection/method of testing are:
(1) voltage output end that is used for the power supply that system provides is become the high tension voltage generating unit of measuring needed high tension voltage is connected with the voltage circuit of a high voltage electric energy standard metering unit and a tested high-voltage electric-energy meter respectively;
One current output terminal that is used for the power supply that system provides is become the high-voltage great-current generating unit of measuring needed high-tension current is connected with the current return of above-mentioned high voltage electric energy standard metering unit and tested high-voltage electric-energy meter respectively;
With above-mentioned high pressure voltage generating unit be connected with the high-voltage great-current generating unit output control terminal respectively through a voltage-regulation unit that be used for to regulate high pressure voltage generating unit output value with is connected the current regulation unit and that is used for regulating high-voltage great-current generating unit output value and is used for that the high pressure voltage generating unit is connected control that the output value detects, controls and can process the output data of data comparison unit and the corresponding control loop port of data processing unit with the high-voltage great-current generating unit and is connected;
The electric energy metrical parameter output terminal and one of above-mentioned high voltage electric energy standard metering unit and tested high-voltage electric-energy meter is used for the continuous data of high voltage electric energy standard metering unit compared with the continuous data of tested high-voltage electric-energy meter and provides the data input pin of the data comparing unit of processing signals to be connected respectively for control and data processing unit;
The data output end of above-mentioned data comparing unit is connected with the corresponding data input port of control and data processing unit;
(2) input end at high tension voltage generating unit and high-voltage great-current generating unit applies specified working power;
(3) control and data processing unit are adjusted to the output valve of high tension voltage generating unit and high-voltage great-current generating unit by voltage-regulation unit and current regulation unit and measure needed operating voltage/working current numerical value;
(4) control and data processing unit detect whether the output valve of high tension voltage generating unit and high-voltage great-current generating unit is the numerical value that needs;
(5) under the control of control and data processing unit, high tension voltage generating unit and high-voltage great-current generating unit apply the primary voltage Un of regulation and the sequential value of primary current In respectively to high voltage electric energy standard metering unit and tested high-voltage electric-energy meter, and keep a period of time respectively, to satisfy each needed time of point measurement electric energy;
(6) the tested energy value data that obtain one group of standard loop energy value that in high voltage electric energy standard metering unit, produces and in tested high-voltage electric-energy meter, produce;
(7) with above-mentioned standard loop energy value and tested energy value data successively respectively correspondence send into the data comparing unit and compare, comparative result is sent into control and data processing unit;
(8) control and data processing unit draw required measuring error number percent γ according to following formula:
(9) control and data processing unit are converted into tester's identifiable information form with measurement result and export, and in view of the above the metering performance of tested high-voltage electric-energy meter are carried out whole calibrating, measurement.
Above-mentioned high tension voltage/high-voltage great-current is three-phase or single-phase voltage/current.
Above-mentioned primary voltage Un is the rated operational voltage (Un can be respectively 3KV, 6KV, 10KV, 27.5KV, 35KV etc.) of high voltage electric energy standard metering unit and tested high-voltage electric-energy meter; The sequential value of above-mentioned primary current In be high voltage electric energy standard metering unit and tested high-voltage electric-energy meter rated operational current 0.5%～120%;
The sequential value of above-mentioned primary current In is preferably 0.5%In, 1%In, 5%In, 10%In, 20%In, 100%In and 120%In.
Above-mentioned measurement will be to measure respectively under the situation of cos ￠=1.0L, cos ￠=0.5L, cos ￠=0.8L in power factor.
Above-mentioned standard loop energy value that in high voltage electric energy standard metering unit, produces and the tested energy value data that in tested high-voltage electric-energy meter, produce, can be metering electric pulse number, measure mechanical umber of pulse, also can be the reading (digital form) of gauging table meter, can also be other discernible electric or mechanical variables (as physical quantitys such as the magnitude of current, voltage, rotating speed, the rotation number of turns, rotational angle or level of torque).
Among Fig. 2, the voltage circuit of the voltage output end of high tension voltage generating unit 1 and high voltage electric energy standard metering unit 5 and tested high-voltage electric-energy meter 6 is connected in parallel.
The current return of the current output terminal of high-voltage great-current generating unit 2 and high voltage electric energy standard metering unit 5 and tested high-voltage electric-energy meter 6 is connected in series.
The output control terminal of high tension voltage generating unit and high-voltage great-current generating unit is connected with the corresponding control loop port of a current regulation unit 4 with control and data processing unit 8 through a voltage-regulation unit 3 respectively.
The electric energy metrical parameter output terminal of high voltage electric energy standard metering unit and tested high-voltage electric-energy meter is connected respectively with the data input pin of a data comparing unit 7.
The data output end of data comparing unit 7 is connected with the corresponding data input port of control and data processing unit 8.
Its high voltage electric energy standard metering unit is the active energy of energy measurement high-voltage electric power circuit transmission and/or the measuring apparatus of reactive energy, and it is made of standard high-voltage current transformer (also claiming current sampling circuit), standard high-voltage voltage transformer (VT) (also claiming voltage sample circuit), phase shifter, standard electric energy meter and the connection line between it at least.Its sample circuit is obtained voltage/current signals from the high-pressure side respectively, becomes low-voltage standards voltage and current signal input standard ic for energy metering to measure through isolated variable, and the metering result imports the data comparing unit.
Its tested high-voltage electric-energy meter also is the active energy of energy measurement high-voltage electric power circuit transmission and/or the measuring apparatus of reactive energy, and it is made of high-tension current inductor, high-voltage mutual inductor, electric energy meter and the connection line between it at least.
Its voltage-regulation unit/current regulation unit can adopt single-phase or the three-phase and four-line automatic coupling voltage regulator constitutes, and the elementary Access Control and the data processing unit of pressure regulator are obtained signal, its secondary access high pressure generator and high-voltage great-current generator.Pressure regulator can be automatically adjusted according to the signal that the standard high-voltage electrical energy devices feeds back by the operating mechanism of control and data processing unit control.
Its high tension voltage/high-voltage great-current generating unit can adopt existing high tension voltage generator and high-voltage great-current generator to constitute, corresponding output end of its low pressure side joint voltage-regulation unit/current regulation unit, its high-pressure side are connected with the voltage/current loop of high voltage electric energy standard metering unit and tested high-voltage electric-energy meter respectively.
Its control and data processing unit are multi-purpose computer PC, the automatic control computer PLC of industrial process, digital signal processor circuit DSP, single chip microcontroller circuit SCM, microcontroller circuit MCU, programmable logic device circuit PLD/CPLD/FPGA or built-in PC circuit.
Embodiment one
Detection/the test of single-phase high voltage electric power meter:
Adopt method of testing and the flow process of Fig. 1, the connection wiring schematic diagram of concrete device as shown in Figure 3.
Wherein, the label among the figure all adopts the standard mark mode of this area, and this point those skilled in the art will readily understand and is easy to and realizes.
Wherein the concrete effect brief introduction of each unit is as follows:
A. high tension voltage generator, high-voltage great-current generating unit: low-voltage, the electric current that regulon is provided becomes high tension voltage Un that measurement needs and the sequential value of high-voltage great-current In, and voltage is parallel to the HV Terminal of standard high-voltage electric energy metrical loop and tested high-voltage electric-energy meter, for the whole detection and the metering of high-voltage electric-energy meter provides power supply; Its way of output can be divided into three kinds of connections (this figure is the single-phase mode of connection, down together) equally according to the difference of tested measuring apparatus: electric current, two loops of voltage are single-phase; Voltage circuit is that phase three-wire three, current return are the V-v mode of connection of two limit phases; Voltage circuit is that three-phase and four-line, current return also are the Y-y mode of connection of three-phase and four-line.
B. electric current, voltage-regulation unit: form current regulation loop, voltage regulation loop respectively by two groups of each three pressure regulators, same, can be divided into three kinds of connections according to the difference of tested measuring apparatus: meter electric current, two loops of voltage are single-phase; Voltage circuit is that phase three-wire three, current return are the V-v mode of connection of two limit phases; Voltage circuit is that three-phase and four-line, current return also are the Y-y mode of connection of three-phase and four-line.
For safety and stable regulation, pressure regulator will have the zero-bit limit switch and slowly regulate conversion equipment.Instruction according to control and data processing unit will need the electric current of regulating, voltage is connected to high tension voltage generator, high-voltage great-current generator by output port input end, produce continuously adjustable and be subjected to the control of feedback signal, stop to the electric energy measurement of this point at the measurement point of the sequential value of high tension voltage Un, high-voltage great-current In and to finish, point-to-point measurement successively, and then obtain one group of sequence numerical value.
C. control and data processing unit: it mainly contains two effects:
(1) control function: its output is divided into electric current, two loops of voltage, can be divided into three kinds of connections according to the difference of tested measuring apparatus: meter electric current, two loops of voltage are single-phase; Voltage circuit is that phase three-wire three, current return are the V-v mode of connection of two limit phases; Voltage circuit is that three-phase and four-line, current return also are the Y-y mode of connection of three-phase and four-line.It can send control signal according to the technical requirement of tested high-voltage electric-energy meter, and the output line of this unit is connected to the input end of electric current, voltage-regulation unit, makes regulon regulate electric current, voltage by technical requirement; Electric current, voltage-regulation begin to be subjected to the control that standard loop is passed signal back, high tension voltage is transferred to sequential value 0.5%In, 1%In, 5%In, 10%In, 20%In, 100%In, the 120%In place that Un, high-voltage great-current be transferred to In and is stopped respectively, so that measure the energy value under this electric current, high tension voltage is transferred to Un, high-voltage great-current is transferred to In and is got control signal from standard high-voltage electric energy loop, passes control and data processing unit back and regulates order ground accurately to reach.
(2) data processing function: high tension voltage is transferred to Un, when high-voltage great-current is transferred to the sequential value of In, the electric energy that electric energy that standard high-voltage electric energy loop produces and tested high voltage electric energy loop produce, by the data comparing unit enter control and data processing unit carry out data processing, control and data processing unit carry out data analysis with the digital signal of input, calculate error amount, and measurement result is converted into tester's identifiable information form (as the data presentation of various CRT or LCD, the storage of database data or output, by forms such as data form printouts) export.
D. high voltage electric energy standard metering unit: it is the core of high voltage electric energy whole detection device, by the normalized current sampler, (available current mutual inductor (CT), fibre optic current sensor (OCT), hollow current sensor, Ruo Gaofusiji (Rogowski) coil, electronic current mutual inductor or photoelectric current inductor are realized), the normal voltage sampler (can be the mutual device of magnetic-type voltage (PT), capacitance type potential transformer, electronic current mutual inductor, photoelectricity voltage mutual inductor (OPT), voltage sensor or resitstance voltage divider are realized) and standard electric energy meter three parts composition high-voltage electric energy measurement standard loop.
The high-pressure side of high voltage electric energy standard metering unit and the high-pressure side of tested high-voltage electric-energy meter together are parallel to the high-voltage output end of high tension voltage generator, the high-tension current side of high voltage electric energy standard metering unit and the high-voltage great-current output terminal that is connected in series to the high-voltage great-current generator after the current return of the high-tension current side of tested high-voltage electric-energy meter is connected again constitute the closed-loop path.
The high tension voltage Un that high tension voltage generator, high-voltage great-current generator provide, the sequential value of high-voltage great-current In (0.5%In, 1%In, 5%In, 10%In, 20%In, 100%In, 120%In) make high voltage electric energy standard metering unit and tested high-voltage electric-energy meter produce measuring standard electric energy (true value electric energy), the corresponding sequential value of tested electric energy respectively.
Its standard electric energy, tested electric energy can be that digital quantity also can be an electric pulse quantity, by the RS-232/RS-485 interface, inserting the input port of data comparing unit, also can be the direct-reading data, by importing data comparing unit or control and data processing unit after manually reading again.
E. tested high-voltage electric-energy meter: the electric energy meter that present high-voltage electric-energy meter uses can divide gate pulse output (but the electronic electric energy meter of teletransmission, multifunctional electric energy meter) and two kinds of no pulse outputs (electronic electric energy meter of mechanical power energy meter, no pulse output), and measuring method also is divided into: direct comparison, ratio of pulse length to the total cycle length are measured than two kinds of methods.
F. data comparing unit: the continuous data of high voltage electric energy standard metering unit and the measured data of tested high-voltage electric-energy meter are by RS-232/RS-485 interface interface, inserting the input port of data comparing unit compares, the measuring error data of comparison turn back to control and data processing unit, for it provides the data that need processing.
Because the technology such as adjusting, control and standard electric energy meter of the automatic control computer PLC of multi-purpose computer PC, industrial process, digital signal processor circuit DSP, single chip microcontroller circuit SCM, microcontroller circuit MCU, programmable logic device circuit PLD/CPLD/FPGA or the built-in PC circuit of formation control and data processing unit and data comparison, voltage/current are prior art, its concrete principle of work and the mode of connection are no longer narrated at this.
During real work, requirement according to product to be tested and corresponding elementary diagram connects the line, check that errorless back is to the major loop energized, control and data processing unit are started working, set every information of tested high-voltage electric-energy meter (as detecting the date according to the prompting of control and data processing unit display screen, examined unit, manufacturing plant, test person, it is right to imitate, numbering, model etc.) and the technical parameter of tested high-voltage electric-energy meter (as supply frequency, the mode of connection of tested high-voltage electric-energy meter, electric pressure, current ratio, accuracy class, power factor etc.), parameter setting is intact than checking the errorless calibrating installation that can start, electric current, voltage-regulation unit energized, the click knob that boosts, regulon can be raised to voltage the system works voltage U n (tested setting value) of tested high-voltage electric-energy meter automatically from " 0 ", high-tension current is adjusted to the sequential value of In and respectively at 0.5%In from " 0 ", 1%In, 5%In, 10%In, 20%In, 100%In, the sequential value of 120%In pauses down, and the time that keeps satisfying in several minutes each point measurement electric energy, all point measurements finish needs 2 hours approximately, measurement finishes, and the back is automatic prints and record, and test job finishes.
Above-mentioned measurement will be to measure respectively under the situation of cos ￠=1.0L, cos ￠=0.5L, cos ￠=0.8L in power factor, and this understands easily to those skilled in the art and is easy to realize, its concrete operations mode, step are no longer narrated at this.
Because the present invention has adopted high-voltage electric-energy meter has been handled as a complete integral body, can carry out whole calibrating and measurement to the metering performance of high-voltage electric-energy meter, directly measure the actual error of tested high pressure energy measuring apparatus, this false drop has comprised each factor that causes error in the tested high-voltage electric-energy meter, it is big to have got rid of the caused comprehensive uncertainty of subsequent installation work, influence problems such as metering accuracy, having avoided the people is the error component that causes, reduced the uncertain factor that produces error, improved the overall accuracy of high-voltage electric-energy meter metering performance, made high-voltage electric energy measurement more accurate, rationally, just.
Embodiment two
Detection/the test of phase three-wire three high-voltage electric-energy meter:
Adopt method of testing and the flow process of Fig. 1, the connection wiring schematic diagram of concrete device as shown in Figure 4.
Present embodiment is that the high-voltage electric-energy meter at three-phase three-wire system detects/tests, and is its mode of connection difference to some extent with the difference of embodiment one, and all the other are with embodiment one.
Embodiment three
Detection/the test of three-phase and four-line high-voltage electric-energy meter:
Adopt method of testing and the flow process of Fig. 1, the connection wiring schematic diagram of concrete device as shown in Figure 5.
Present embodiment is that the high-voltage electric-energy meter at three-phase four-wire system detects/tests, and is its mode of connection difference to some extent with the difference of embodiment one or embodiment two, and all the other are with embodiment one or embodiment two.
More than the specific embodiment of the present invention has been made brief description; but the present invention not only is confined to the above-mentioned mode of having enumerated; every those skilled in the art adopts with the method for the invention and is equal to or similar methods; high-voltage electric-energy meter is carried out detection, test, the verification of whole synthesis error in dipping as a single unit system, all drop within the protection domain of request of the present invention.
The present invention can be widely used in fields such as the whole detection, test, verification of the high-voltage electric-energy meter of various electric pressures.
Claims (10)
1. the integral body of high-voltage electric-energy meter metering performance calibrating, measuring method is characterized in that:
(1) voltage output end that is used for the power supply that system provides is become the high tension voltage generating unit of measuring needed high tension voltage is connected with the voltage circuit of a high voltage electric energy standard metering unit and a tested high-voltage electric-energy meter respectively;
One current output terminal that is used for the power supply that system provides is become the high-voltage great-current generating unit of measuring needed high-tension current is connected with the current return of above-mentioned high voltage electric energy standard metering unit and tested high-voltage electric-energy meter respectively;
With above-mentioned high pressure voltage generating unit be connected with the high-voltage great-current generating unit output control terminal respectively through a voltage-regulation unit that be used for to regulate high pressure voltage generating unit output value with is connected the current regulation unit and that is used for regulating high-voltage great-current generating unit output value and is used for that the high pressure voltage generating unit is connected control that the output value detects, controls and can process the output data of data comparison unit and the corresponding control loop port of data processing unit with the high-voltage great-current generating unit and is connected;
The electric energy metrical parameter output terminal and one of above-mentioned high voltage electric energy standard metering unit and tested high-voltage electric-energy meter is used for the continuous data of high voltage electric energy standard metering unit compared with the continuous data of tested high-voltage electric-energy meter and provides the data input pin of the data comparing unit of processing signals to be connected respectively for control and data processing unit;
The data output end of above-mentioned data comparing unit is connected with the corresponding data input port of control and data processing unit;
(2) input end at high tension voltage generating unit and high-voltage great-current generating unit applies specified working power;
(3) control and data processing unit are adjusted to the output valve of high tension voltage generating unit and high-voltage great-current generating unit by voltage-regulation unit and current regulation unit and measure needed operating voltage/working current numerical value;
(4) control and data processing unit detect whether the output valve of high tension voltage generating unit and high-voltage great-current generating unit is the numerical value that needs;
(5) under the control of control and data processing unit, high tension voltage generating unit and high-voltage great-current generating unit apply the primary voltage Un of regulation and the sequential value of primary current In respectively to high voltage electric energy standard metering unit and tested high-voltage electric-energy meter, and keep a period of time respectively, to satisfy each needed time of point measurement electric energy;
(6) the tested energy value data that obtain one group of standard loop energy value that in high voltage electric energy standard metering unit, produces and in tested high-voltage electric-energy meter, produce;
(7) with above-mentioned standard loop energy value and tested energy value data successively respectively correspondence send into the data comparing unit and compare, comparative result is sent into control and data processing unit;
(8) control and data processing unit draw required measuring error number percent γ according to following formula:
(9) control and data processing unit are converted into tester's identifiable information form with measurement result and export, and in view of the above the metering performance of tested high-voltage electric-energy meter are carried out whole calibrating, measurement.
2. according to integral body calibrating, the measuring method of the described high-voltage electric-energy meter metering performance of claim 1, it is characterized in that the voltage output end of described high tension voltage generating unit and the voltage circuit of high voltage electric energy standard metering unit and tested high-voltage electric-energy meter are connected in parallel.
3. according to integral body calibrating, the measuring method of the described high-voltage electric-energy meter metering performance of claim 1, it is characterized in that the current output terminal of described high-voltage great-current generating unit and the current return of above-mentioned high voltage electric energy standard metering unit and tested high-voltage electric-energy meter are connected in series.
4. according to integral body calibrating, the measuring method of the described high-voltage electric-energy meter metering performance of claim 1, it is characterized in that described high tension voltage/high-voltage great-current is three-phase or single-phase voltage/current.
5. according to the calibrating of the integral body of the described high-voltage electric-energy meter metering performance of claim 1, measuring method, it is characterized in that described high voltage electric energy standard metering unit and tested high-voltage electric-energy meter are respectively the active energy of energy measurement high-voltage electric power circuit transmission and/or the measuring apparatus of reactive energy, its high voltage electric energy standard metering unit is made of standard high-voltage current transformer, standard high-voltage voltage transformer (VT), phase shifter, standard electric energy meter and the connection line between it at least; Its tested high-voltage electric-energy meter is made of high-tension current inductor, high voltage potential transformer, electric energy meter and the connection line between it at least.
6. according to the calibrating of the integral body of the described high-voltage electric-energy meter metering performance of claim 5, measuring method, it is characterized in that described phase shifter can regulate power factor cos ￠=1.0L, cos ￠=0.5L or cos ￠=0.8L.
7. according to integral body calibrating, the measuring method of the described high-voltage electric-energy meter metering performance of claim 1, it is characterized in that described control and data processing unit are multi-purpose computer PC, the automatic control computer PLC of industrial process, digital signal processor circuit DSP, single chip microcontroller circuit SCM, microcontroller circuit MCU, programmable logic device circuit PLD/CPLD/FPGA or built-in PC circuit.
8. according to integral body calibrating, the measuring method of the described high-voltage electric-energy meter metering performance of claim 1, it is characterized in that described primary voltage Un is the rated operational voltage of high voltage electric energy standard metering unit and tested high-voltage electric-energy meter.
9. according to the calibrating of the integral body of the described high-voltage electric-energy meter metering performance of claim 1, measuring method, the sequential value that it is characterized in that described primary current In be high voltage electric energy standard metering unit and tested high-voltage electric-energy meter rated operational current 0.5%～120%.
10. according to integral body calibrating, the measuring method of the described high-voltage electric-energy meter metering performance of claim 9, it is characterized in that the sequential value of described primary current In is preferably 0.5% In, 1% In, 5% In, 10% In, 20% In, 100% In and 120% In.
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Assignee: Zibo Electric Co., Ltd. Paul electric Assignor: Zibo Jibao Mutual Inductor Inst. Contract fulfillment period: 2009.7.17 to 2019.7.16 contract change Contract record no.: 2009370000262 Denomination of invention: Integrate detecting and measuring method for metering property of high voltage power meter Granted publication date: 20090729 License type: Exclusive license Record date: 2009.9.3 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.7.17 TO 2019.7.16; CHANGE OF CONTRACT Name of requester: ZIBO JIBAO ELECTRIC APPLICANCE CO., LTD. Effective date: 20090903 |