CN101865986A - System and method for checking error of high-voltage electric energy measurement device - Google Patents
System and method for checking error of high-voltage electric energy measurement device Download PDFInfo
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Abstract
The invention discloses a system and a method for checking the error of a high-voltage electric energy measurement device. The system comprises a test power source, a standard electric energy measurement system and a comparison display, wherein the error of the high-voltage electric energy measurement device is checked in the field by using the high-voltage current of the test power source, which is generated by using three-phase high voltage as the test voltage of the test power source to carry out the high-potential clamping process on two/three groups of test current respectively, to excite the measurement device to be checked, and comparing the response output of the measurement device to be checked with that of the standard electric energy measurement system. The measurement system comprises a voltage sensor, a current sensor and a standard electric energy meter. The method comprises the following steps: determining the error of the system in measurement accuracy by the standard electric energy measurement system; and calculating the overall error according to the limit of the error, so as to control the requirements for the lowest accuracy level. The system of the invention is capable of determining the overall measurement accuracy (0.1) of the high-voltage electric energy measurement device to be checked.
Description
Technical field
The present invention relates to the metering calibration technology of power equipment, relate in particular to a kind of high-voltage electric-energy meter and carry out error field-checking system and method.
Background technology
High-voltage electric-energy meter is a kind of important electric energy metrical instrument, mainly is made up of voltage transformer (VT), current transformer and low pressure multifunctional electric energy meter etc.In the design and production run of electric power meter, forming the error of the element of measuring apparatus fixes, using customary method is the accuracy that the composition error method just can this metering outfit of standard, thereby also can only be to adopt different calibration equipments to obtain the error of voltage transformer (VT), current transformer and electric energy meter and the amount of influence of voltage transformer secondary voltage drop respectively, and then calculate the global error of calculating measuring apparatus by composition error for the field-checking of electric power meter.
Yet it is generally not consider actual loading that voltage, current transformer carry out error testing, only apply its design load and test, and theoretical research shows that the main factor that influences voltage, current transformer error is exactly an actual load.Continuous progress along with measuring technique, a large amount of electronic watches, digital watch have replaced original analog pointer gauge, make the actual loading of mutual inductor alleviate greatly, away from the load lower limit of assurance accuracy of instrument transformers, therefore voltage, the current transformer of assay approval can not guarantee its accuracy in the electric energy metered system of reality, even may be away from the requirement of metering accuracy.Simultaneously, the secondary circuit of mutual inductor also may be transformed with the appearance of technical development and new product, actual secondary load is changed greatly, but the ct calibrating cycle of rules regulation is long, in calibration interval, also can't controls owing to actual load changes the error of bringing.Because the error of the above each several part not only has its characteristics and rule separately, and because the difference of wiring, the composition error that factors such as the variation of service condition cause is also different.Measure according to existing calibration method, the global error of the electric power meter of gained is uncertain, also just can not carry out whole measurement verification and calibration.
International Electrotechnical Commission (IEC) about the cardinal rule of electric energy and calibrator for watt-hour meter regulation is: the 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.In addition, according to the measurement Law of China, a kind of measurement instrument that does not have accuracy index or its accuracy index not to have maybe can not implement objective measurement verification, its metering result can not be as the foundation to user's charge.
Because existing metering system error control method can't be demarcated the class of accuracy of total system, because the electric quantity loss that error in dipping caused is uncontrollable at all, this brings bigger economic loss all can for power generation, power supply department and user thus.
Therefore, carrying out electric power meter global error field-checking Study on Technology is a necessary job.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide a kind of error checking system and method for high-voltage electric-energy meter, can't demarcate the class of accuracy of total system and the defective of carrying out error checking in the current electric power meter verification process to solve; And solve the portable problem of described error checking system.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of error checking system of high-voltage electric-energy meter, this system comprise experiment power supply, standard power measuring system and comparison display instrument (110); Wherein,
Experiment power supply is used to described tested high-voltage electric-energy meter that high voltage electric energy is provided;
The standard power measuring system, the standard energy value that is used to measure described pilot system, and output characterizes the response signal of electric energy eigenwert to comparing display instrument (110);
Display instrument (110) relatively is used for the response signal of the sign electric energy eigenwert of described standard power measuring system output is compared as the signal of benchmark with the output of tested electric power meter, and the demonstration check results.
Wherein, described experiment power supply comprises supervisory keyboard (101), low-voltage signal unit (102), power amplifier (103), stepup transformer (104), current lifting device (105), current signal sensor (106) and voltage signal sensor (107); Wherein,
Supervisory keyboard (101), by linking to each other with described low-voltage signal unit (102), be used to import required voltage and current parameter, produce low pressure three-phase voltage signal and two-phase/three-phase current signal, thereby regulate the generation of low voltage voltage, current signal with control low-voltage signal unit (102);
Low-voltage signal unit (102), be used for signal source as low pressure three-phase voltage, two-phase/three-phase current generation, and accept the parameters that current signal sensor (106) and voltage signal sensor (107) are fed back, to stablize the output of described voltage and current signal unit (102);
Power amplifier (103) is used to amplify voltage, the current signal of described low-voltage signal unit (102) output, and voltage, the current signal after will amplifying then imported stepup transformer (104) and current lifting device (105) respectively;
Stepup transformer (104) and current lifting device (105), the voltage that is used for described power amplifier (103) is exported, current signal through power amplification, boost, signal that up-flow provides the high voltage and current that suits the requirements after handling;
Current signal sensor (106) and voltage signal sensor (107), be arranged on through carrying on the three-phase power line of high voltage and current signal after described stepup transformer (104) and current lifting device (105) processing, be used for providing feedback signal, with the voltage of stablizing this voltage and current signal unit (102), the output of current signal to described low-voltage signal unit (102).
Wherein, described standard power measuring system comprises current signal sensor (106), voltage signal sensor (107) and standard electric energy meter (109): wherein,
Described current signal sensor (106) and voltage signal sensor (107), be arranged on the power lead that carries high voltage, big current signal that described experiment power supply exports, be used for being provided for measuring the signal of energy value to described standard electric energy meter (109);
Standard electric energy meter (109), be used to connect the current signal sensor (106) of described experiment power supply and voltage signal sensor (107) with the energy value of experiment with measuring system standard, and export the signal of the electric energy eigenwert of self output to comparison display instrument (110);
The signal of the sign electric energy eigenwert of described standard power measuring system output is the high-frequency electrical energy pulse signal.
Described power amplifier (103) is numeric type power amplifier, switching mode power amplifier or linear power amplifier.
Described stepup transformer (104) is two groups of independently stepup transformers and with V/V mode of connection output, perhaps be three groups independently stepup transformer perhaps directly export with the Y or the D mode of connection by one group of three-phase voltage increasing device; Described current lifting device (105) is two groups of all insulation current lifting devices or three groups of all insulation current lifting devices.
The degree of stability of described experiment power supply realizes according to the feedback of output signal, obtains the equal proportion signal by current signal sensor (106), voltage signal sensor (107), realizes follow-up by direct introducing signal source; Or the signal of the accurate measurement by the output of described standard power measuring system, and read by described low-voltage signal unit (102) and to realize soft feedback.
Described voltage signal sensor (107) is the two standard sets voltage transformer (VT), or is three groups of standard potential transformers, perhaps is three groups of resitstance voltage divider, capacitive divider or RC divider relatively;
Described current signal sensor (106) is standard current transformer or shunt, and described current signal sensor (106) is used two groups or three groups.
A kind of error checking method of high-voltage electric-energy meter, this method comprises:
A, with the excitation of the high-tension current two-phase/three-phase output signal of experiment power supply as tested high-voltage electric-energy meter, and the output signal that will be connected across the standard power measuring system on the described experiment power supply output line inserts relatively display instrument;
B, export the response signal of the sign electric energy eigenwert of described standard power measuring system output to the described relatively output signal of display instrument as standard value and described tested high-voltage electric-energy meter and compare, and the demonstration check results.
The implementation procedure that further comprises experiment power supply before the described steps A:
Obtain required three-phase test voltage after the three-phase voltage signal of low-voltage signal unit handled by power amplifier and stepup transformer; Be met required test current after the two-phase/three-phase low-tension current signal of described low-voltage signal unit output handled by power amplifier and current lifting device; Adopt described trial voltage that the noble potential clamper is carried out in the test current loop, make current return be in high-voltage, obtain the high-tension current two-phase/three-phase output signal of experiment power supply.
A kind of control method of measuring error precision of standard power measuring system, this method comprises:
A, the current signal sensor by the standard power measuring system, voltage signal sensor and standard electric energy meter are determined the measuring accuracy grade, and it is controlled as the requirement of minimum accuracy rating by the composition error that the error limit value calculates;
B, improve the degree of stability of experiment power supply by the mode of follow-up or soft feedback; Described follow-up is for to obtain the equal proportion signal of the output of experiment power supply by voltage signal sensor, current signal sensor, as the input feedback signal of low-voltage signal unit; The described soft output signal that is fed back to described voltage signal sensor, current signal sensor is connected to standard electric energy meter, reads the measurement result of described standard electric energy meter as feedback signal by described low-voltage signal unit;
C, by the high-frequency electrical energy pulse signal that is used for the signature criteria electric energy of the described standard electric energy meter output electrical energy pulse signal with the electric energy measurement value that is used to characterize tested high-voltage electric-energy meter is compared, calculate the global error precision of described high-voltage electric-energy meter.
The error checking system and method for high-voltage electric-energy meter provided by the present invention has the following advantages:
The present invention is used by adopting small-sized low-voltage signal unit and combined standard power measuring system and comparing display instrument, promptly adopt error field-checking of the present invention system that high-voltage electric-energy meter is carried out whole verification, make the high pressure measurement device possess measurable whole accuracy of measuring, avoided detecting the complicated processes of electric energy meter, mutual inductor, secondary circuit under the traditional approach respectively, thereby improved the verification work efficiency greatly; In addition, because experiment power supply adopts the independent design of voltage, current return, actual power demand is not high, and because actual loading is also very low, therefore the low-voltage signal unit also greatly reduces power attenuation, die, can significantly reduce the volume and weight of described system, make it to meet the convenience requirement of field-checking.
Description of drawings
Fig. 1 is the illustrative view of functional configuration of the error checking system of high-voltage electric-energy meter of the present invention;
Fig. 2 is the error checking method flow synoptic diagram of high-voltage electric-energy meter of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiments of the invention method of the present invention is described in further detail.
Fig. 1 is the illustrative view of functional configuration of the error checking system of high-voltage electric-energy meter of the present invention, as shown in Figure 1, the error checking system of high-voltage electric-energy meter of the present invention, be applicable to the field-checking of two elements/three element high-voltage electric-energy meter to high-voltage electric power system, described error checking system, comprise parts such as experiment power supply, standard power measuring system, as comparing display instrument 110; Wherein, described experiment power supply comprises supervisory keyboard 101, low-voltage signal unit 102, power amplifier 103, stepup transformer 104, current lifting device 105, current signal sensor 106, voltage signal sensor 107; Described standard power measuring system comprises current signal sensor 106, voltage signal sensor 107 and standard electric energy meter 109.Wherein,
Described supervisory keyboard 101, be used to import basic parameters such as required voltage, electric current, produce low pressure three-phase voltage signal and two-phase (to two elements method electric power meter) or three-phase (to three element method electric power meter) current signal with control low-voltage signal unit 102, thereby regulate the generation of control low voltage voltage, current signal.
Here, phase angle can be provided with in advance between described each phase current voltage, certainly voltage and current signal output effective value also can be set respectively, the harmonic wave that on voltage and current signal, can superpose respectively, and output frequency can be set in 40 hertz～60 hertz scopes.
Described low-voltage signal unit 102 is used for the signal source as low pressure three-phase voltage and two-phase (to two elements method electric power meter) or the generation of three-phase (to three element method electric power meter) electric current.
Here, described low-voltage signal unit 102 is provided with display screen, can demonstration work export situation and show the parameters that current signal sensor 106 and voltage signal sensor 107 feed back.
Described power amplifier 103 is used to amplify voltage, the current signal of 102 outputs of described low-voltage signal unit, and voltage, current signal after will amplifying are then imported stepup transformer 104 and current lifting device 105 respectively.
Here, described power amplifier 103 can be numeric type power amplifier, switching mode power amplifier, also can be linear power amplifier.
Described stepup transformer 104 and current lifting device 105, the voltage that is used for described power amplifier 103 is exported, current signal through power amplification, boost, after up-flow handles, for high-voltage electric-energy meter 108 is provided for the simulated conditions of work, promptly provide the input signal of high voltage and current.
Here, described stepup transformer 104 be two groups independently stepup transformer with V/V mode of connection output, perhaps be three groups independently stepup transformer perhaps directly export with the Y or the D mode of connection by one group of three-phase voltage increasing device.Described current lifting device 105 is two groups of all insulation current lifting devices (at two elements method electric power meter) or three groups of all insulation current lifting devices (at three element method electric power meter).
Described current signal sensor 106 and voltage signal sensor 107, be arranged on through carrying on the three-phase power line of high voltage and current signal after described stepup transformer 104 and current lifting device 105 processing, be used for providing feedback signal, with the voltage of stablizing this voltage and current signal unit 102, the output of current signal to described low-voltage signal unit 102.Here, described voltage signal sensor is two groups (to two elements method electric power meters) or three groups (to three element method electric power meter), and this voltage sensor can be PT, voltage divider etc.; Described current signal sensor is two groups (to two elements method electric power meters) or three groups (to three element method electric power meter), and this current sensor can be CT, shunt etc.Described current signal sensor 106 is the precision current signal transducer, and described voltage signal sensor 107 is the accurate voltage signal transducer.Wherein, for realizing and improve the stable output signal degree of experiment power supply, the application's proposition is obtained the equal proportion signal by the method that the feedback of utilizing signal realizes by current signal sensor 106, voltage signal sensor 107, realizes follow-up by direct introducing signal source; Or the signal of the accurate measurement by the output of described standard power measuring system, and read by described low-voltage signal unit 102 and to realize soft feedback
Described high-voltage electric-energy meter 108 is used to connect the three-phase power line that carries the high voltage and current signal after described stepup transformer 104 and current lifting device 105 processing, carries out error checking work to utilize this high voltage and current signal.The output terminal of described high-voltage electric-energy meter 108 is connected with comparison display instrument 110.
Here, the input end of described three-phase high-voltage electric energy measuring apparatus 108 directly is connected with current lifting device group 105 with stepup transformer 104, and the signal of metering output acquisition sign energy value, and the signal of described sign energy value is exported to described relatively display instrument 110.
Described standard electric energy meter 109 is used to calculate energy value, and with the electric energy eigenwert of its output as reference value.
Here, described standard electric energy meter 109 links to each other with described voltage signal sensor 107 with described current signal sensor 106 respectively, and, the output terminal of described standard electric energy meter 109, accurate high-tension current sensor 106 and precision voltage sensor 107 output terminals are connected with described low-voltage signal unit 102 respectively, are used to transmit feedback signal.In addition, the output of described standard electric energy meter 109 also links to each other with comparison display instrument 110, in order to export the energy value that is calculated.In addition, described current signal sensor 106 and voltage signal sensor 107 are arranged on the power lead that carries high voltage, big current signal that described experiment power supply exports, and also are used for being provided for measuring the signal of energy value to described standard electric energy meter 109; Standard electric energy meter 109 is used to connect the current signal sensor 106 of described experiment power supply and voltage signal sensor 107 calculating energy value, and exports the signal of the electric energy eigenwert of self output to comparison display instrument 110; The signal of the sign electric energy eigenwert of described standard power measuring system output is the high-frequency electrical energy pulse signal.
Described relatively display instrument 110 is used for the electric energy eigenwert of described high-voltage electric-energy meter 108 and 109 outputs of described standard electric energy meter is compared, and shows check results.
Here, described relatively display instrument 110 is connected with described standard electric energy meter 109 and high-voltage electric-energy meter 108 respectively, receives the signal that both characterize energy value, in order to show check results.Wherein, the signal of described sign energy value is the high-frequency electrical energy pulse signal, promptly all sent to and describedly must compare display instrument 110, show the number percent of the electric energy metering error that described comparison display instrument 110 calculates simultaneously by the high frequency verification pulse of the electrical energy pulse signal of verification object high-voltage electric-energy meter 108 output and standard electric energy meter 109.
In addition, described low-tension supply signal generation unit 102, the low-tension current, the voltage signal that produce, by its output terminal respectively after power amplifier 103 amplifies, link to each other with current lifting device 105 with stepup transformer 104 respectively again, and with both output signal by exporting on the three-phase power line, export to high-voltage electric-energy meter 108 by three-phase power line; Described current signal sensor 106 and voltage signal sensor 107 are arranged on the described three-phase power line, it is between tested high-voltage electric-energy meter 108 and described stepup transformer 104 and current lifting device 105, with the equivalent position of described high-voltage electric-energy meter 108 work; In addition, the output terminal of described current signal sensor 106 and voltage signal sensor 107 is connected with described low-tension supply signal generation unit respectively.
The control section of global error of high voltage energy metering installation on-site calibrating method of the present invention realized by supervisory keyboard 101, in order to the magnitude of voltage and the current value of 102 outputs of described low-voltage signal unit to be set, thereby regulates the generation of control low voltage voltage, electric current.
Be that three-phase high-voltage electric energy measuring apparatus 108 is separated from electric system in use with described detected object, and directly be connected with stepup transformer 104 and current lifting device group 105.When calibration equipment work begins, by basic parameters such as described supervisory keyboard 101 input voltages, electric currents, control described low-voltage signal unit 102 and produce three-phase voltage signal and two-phase (to two elements method electric power meter) or three-phase (to three element method electric power meter) current signal, phase angle can be provided with in advance between the current/voltage of each phase, certainly voltage and current signal output effective value also can be set respectively, the harmonic wave that can superpose respectively on voltage and current signal, output frequency can be set in 40 hertz～60 hertz scopes.The foundation of error calibrating is a relative method, and according to the output recurrent interval of described three-phase high-voltage electric energy measuring apparatus 108, the umber of pulse of statistical standard electric energy meter output by calculating error, and relatively shows on the display instrument 110 described.
Need to prove, the input end of described standard electric energy meter 109, high-tension current sensor 106 and voltage sensor 107 output terminals are connected with described low-voltage signal unit 102 feedback ends respectively, except passing through the low-tension current of transmission feedback signal with control stabilization, the generation of voltage, and electric current by feedbacking, voltage signal and preset value compare, thereby can carry out outside the corresponding output valve adjustment, described on the other hand low-voltage signal unit 102 itself also has Presentation Function, can demonstration work export the parameters that situation and high-tension current sensor 106 and voltage sensor 107 feed back.
Fig. 2 is the error checking method flow synoptic diagram of high-voltage electric-energy meter of the present invention, and as shown in Figure 2, this method comprises:
Step 201: a kind of experiment power supply that is used for high-voltage electric-energy meter at first is provided; The implementation procedure of this experiment power supply specifically comprises:
The three-phase voltage signal of described low-voltage signal unit 102 obtains testing the three-phase test voltage of required voltage and power requirement through power amplifier 103 and stepup transformer 104; Two-phase/three-phase low-tension current the signal of described low-voltage signal unit 102 outputs (when corresponding two elements method of difference and three element method electric power meter) obtains testing the test current of required electric current and power requirement through described power amplifier 103 and current lifting device 105; And the noble potential clamper is carried out in the test current loop with trial voltage, and make current return be in high-voltage, form the three-phase output of high-tension current; The voltage of experiment power supply, current output signal feed back to low-voltage signal unit 102 and export adjusting after sampling, with the stable of the three-phase high-voltage electric current experiment power supply of the global error verification that guarantees to be used for high-voltage electric-energy meter 108 and accurately.
Step 202: then described experiment power supply and standard power measuring system are connected with tested high-voltage electric-energy meter.Specific as follows: as to utilize described experiment power supply that high-voltage electric-energy meter is carried out error checking, this process comprises: with the excitation as tested high-voltage electric-energy meter of the high-tension current two-phase/three-phase output signal of experiment power supply, and the output signal that will be connected across the standard power measuring system on the described experiment power supply output line inserts relatively display instrument.
Step 203: last, export the response signal of the sign electric energy eigenwert of described standard power measuring system output to the described relatively output signal of display instrument as standard value and described tested high-voltage electric-energy meter and compare, and the demonstration check results.
Simultaneously, the present invention also provides a kind of control method of accuracy of measurement of standard power measuring system, and this method specifically comprises:
Step 2031: current signal sensor, voltage signal sensor and standard electric energy meter by the standard power measuring system are determined the measuring accuracy grade, and it is controlled as the requirement of minimum accuracy rating by the composition error that the error limit value calculates;
Step 2032: the degree of stability that improves experiment power supply by the mode of follow-up or soft feedback; Described follow-up is for to obtain the equal proportion signal of the output of experiment power supply by voltage signal sensor, current signal sensor, as the input feedback signal of low-voltage signal unit; The described soft output signal that is fed back to described voltage signal sensor, current signal sensor is connected to standard electric energy meter, reads the measurement result of described standard electric energy meter as feedback signal by described low-voltage signal unit;
Step 2033:, calculate the global error precision of described high-voltage electric-energy meter by the high-frequency electrical energy pulse signal that is used for the signature criteria electric energy of the described standard electric energy meter output electrical energy pulse signal with the electric energy measurement value that is used to characterize tested high-voltage electric-energy meter is compared.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (10)
1. the error checking system of a high-voltage electric-energy meter, it is characterized in that: this system comprises experiment power supply, standard power measuring system and comparison display instrument (110); Wherein,
Experiment power supply is used to described tested high-voltage electric-energy meter that required high voltage electric energy is provided;
The standard power measuring system, the standard energy value that is used to measure described pilot system, and output characterizes the response signal of electric energy eigenwert to comparing display instrument (110);
Display instrument (110) relatively is used for the response signal of the sign electric energy eigenwert of described standard power measuring system output is compared as the signal of benchmark with the output of tested electric power meter, and the demonstration check results.
2. according to the described check system of claim 1, it is characterized in that: described experiment power supply comprises supervisory keyboard (101), low-voltage signal unit (102), power amplifier (103), stepup transformer (104), current lifting device (105), current signal sensor (106) and voltage signal sensor (107); Wherein,
Supervisory keyboard (101), by linking to each other with described low-voltage signal unit (102), be used to import required voltage and current parameter, produce low pressure three-phase voltage signal and two-phase/three-phase current signal, thereby regulate the generation of low voltage voltage, current signal with control low-voltage signal unit (102);
Low-voltage signal unit (102), be used for signal source as low pressure three-phase voltage, two-phase/three-phase current generation, and accept the parameters that current signal sensor (106) and voltage signal sensor (107) are fed back, to stablize the output of described voltage and current signal unit (102);
Power amplifier (103) is used to amplify voltage, the current signal of described low-voltage signal unit (102) output, and voltage, the current signal after will amplifying then imported stepup transformer (104) and current lifting device (105) respectively;
Stepup transformer (104) and current lifting device (105), the voltage that is used for described power amplifier (103) is exported, current signal through power amplification, boost, signal that up-flow provides the high voltage and current that suits the requirements after handling;
Current signal sensor (106) and voltage signal sensor (107), be arranged on through carrying on the three-phase power line of high voltage and current signal after described stepup transformer (104) and current lifting device (105) processing, be used for providing feedback signal, with the voltage of stablizing this voltage and current signal unit (102), the output of current signal to described low-voltage signal unit (102).
3. check system according to claim 1, it is characterized in that: described standard power measuring system comprises current signal sensor (106), voltage signal sensor (107) and standard electric energy meter (109): the signal of the sign electric energy eigenwert of described standard power measuring system output is the high-frequency electrical energy pulse signal; Wherein,
Described current signal sensor (106) and voltage signal sensor (107) are arranged on the power lead that carries the high voltage and current signal that described experiment power supply exports, and are used for being provided for measuring the signal of energy value to described standard electric energy meter (109);
Standard electric energy meter (109), be used to connect the current signal sensor (106) of described experiment power supply and voltage signal sensor (107) with the energy value of experiment with measuring system standard, and export the signal of the electric energy eigenwert of self output to comparison display instrument (110).
4. error checking according to claim 2 system, it is characterized in that: described power amplifier (103) is numeric type power amplifier, switching mode power amplifier or linear power amplifier.
5. error checking according to claim 2 system, it is characterized in that: described stepup transformer (104) is two groups of independently stepup transformers and export with the V/V mode of connection, perhaps be three groups independently stepup transformer perhaps directly export with the Y or the D mode of connection by one group of three-phase voltage increasing device; Described current lifting device (105) is two groups of all insulation current lifting devices or three groups of all insulation current lifting devices.
6. according to claim 2 or 3 described error checking systems, it is characterized in that: the degree of stability of described experiment power supply realizes according to the feedback of output signal, obtain the equal proportion signal by current signal sensor (106), voltage signal sensor (107), realize follow-up by direct introducing signal source; Or the signal of the accurate measurement by the output of described standard power measuring system, and read by described low-voltage signal unit (102) and to realize soft feedback.
7. error checking according to claim 2 system, it is characterized in that: described voltage signal sensor (107) is the two standard sets voltage transformer (VT), or be three groups of standard potential transformers, perhaps be three groups of resitstance voltage divider, capacitive divider or RC divider relatively;
Described current signal sensor (106) is standard current transformer or shunt, and described current signal sensor (106) is used two groups or three groups.
8. the error checking method of a high-voltage electric-energy meter, it is characterized in that: this method comprises:
A, with the excitation of the high-tension current two-phase/three-phase output signal of experiment power supply as tested high-voltage electric-energy meter, and the output signal that will be connected across the standard power measuring system on the described experiment power supply output line inserts relatively display instrument;
B, export the response signal of the sign electric energy eigenwert of described standard power measuring system output to the described relatively output signal of display instrument as standard value and described tested high-voltage electric-energy meter and compare, and the demonstration check results.
9. method of calibration according to claim 8 is characterized in that: the implementation procedure that further comprises experiment power supply before the described steps A:
Obtain required three-phase test voltage after the three-phase voltage signal of low-voltage signal unit handled by power amplifier and stepup transformer; Be met required test current after the two-phase/three-phase low-tension current signal of described low-voltage signal unit output handled by power amplifier and current lifting device; Adopt described trial voltage that the noble potential clamper is carried out in the test current loop, make current return be in high-voltage, obtain the high-tension current two-phase/three-phase output signal of experiment power supply.
10. the control method of the measuring error precision of a standard power measuring system, it is characterized in that: this method comprises:
A, the current signal sensor by the standard power measuring system, voltage signal sensor and standard electric energy meter are determined the accuracy of measurement grade, and it is controlled as the requirement of minimum accuracy rating by the composition error that the error limit value calculates;
B, improve the degree of stability of experiment power supply by the mode of follow-up or soft feedback; Described follow-up is for to obtain the equal proportion signal of the output of experiment power supply by voltage signal sensor, current signal sensor, as the input feedback signal of low-voltage signal unit; The described soft output signal that is fed back to described voltage signal sensor, current signal sensor is connected to standard electric energy meter, reads the measurement result of described standard electric energy meter as feedback signal by described low-voltage signal unit;
C, by the high-frequency electrical energy pulse signal that is used for the signature criteria electric energy of the described standard electric energy meter output electrical energy pulse signal with the electric energy measurement value that is used to characterize tested high-voltage electric-energy meter is compared, calculate the global error precision of described high-voltage electric-energy meter.
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Cited By (31)
| Publication number | Priority date | Publication date | Assignee | Title |
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| SE504416C2 (en) * | 1995-10-27 | 1997-02-03 | Sydkraft Ab | Control measurement system for control measurement of energy measurement systems |
| CN100520437C (en) * | 2005-09-06 | 2009-07-29 | 淄博计保互感器研究所 | Integrated detecting and measuring method for metering property of high voltage power meter |
| CN200962142Y (en) * | 2006-08-31 | 2007-10-17 | 武汉国测科技股份有限公司 | High-voltage power meter correction device |
| CN101251585A (en) * | 2008-03-26 | 2008-08-27 | 武汉国测科技股份有限公司 | Method and apparatus for checking global error of high voltage energy metering installation |
| CN201425621Y (en) * | 2009-04-15 | 2010-03-17 | 武汉国测科技股份有限公司 | Error checking system of high-voltage electric energy metering device |
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