CN101865988B - Test power supply for error check of high-voltage electric energy metering device and implementation method thereof - Google Patents
Test power supply for error check of high-voltage electric energy metering device and implementation method thereof Download PDFInfo
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Abstract
The invention discloses a test power supply for error check of on-site high-voltage electric energy and an implementation method thereof. The test power supply comprises a control keyboard, a power amplifier, a booster, a current increaser, a low-voltage signal unit, a voltage signal sensor, a current signal sensor and the like. The method comprises the following steps of: amplifying the output end of the low-voltage signal unit through a voltage power amplifier and a current power amplifier and treating the output end through the booster and the current increaser to produce a high-voltage signal and a large-current signal for outputting to a three-phase power wire so as to provide a working power supply for a high-voltage electric energy metering device; and arranging a voltage signal sensor and a current signal sensor on the three-phase power wire and feeding the outputs of the voltage signal sensor and the current signal sensor back to a low-pressure signal power supply signal generating unit so as to stabilize power supply output. After the test power supply of the invention adopts the technical scheme, the size and the weight of the test power supply can meet the requirement on the convenience of on-site check.
Description
Technical field
The present invention relates to the power measuring instrument of power equipment automatic field, relate in particular to a kind of high voltage, cranking test power supply and its implementation of high-voltage electric-energy meter being carried out error checking for the scene.
Background technology
In the power automation field, global error field-checking to high-voltage electric-energy meter needs three-phase high voltage, high-current supply, for example: the electric power meter to a 10kV, 100A carries out error checking, be that 120% of rated voltage and electric current calculates by maximum current, then the equivalent capacity of experiment power supply is:
Yet it is very difficult will obtaining powerful like this stabilized power source, because such experiment power supply volume and weight is all very large, and cost is also very expensive, therefore, obviously can not satisfy the requirement of high-voltage electric-energy meter being carried out site test.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide a kind of experiment power supply and its implementation of carrying out error checking for high-voltage electric-energy meter, by reducing the volume and weight of experiment power supply, to satisfy in-site measurement to the demand of required high voltage, cranking test power supply.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of experiment power supply for error check of high-voltage electric energy metering device, this experiment power supply comprise 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), link to each other with described low-voltage signal unit (102), be used for inputting required voltage, current parameters, produce low voltage three-phase voltage signal and two-phase/three-phase current signal with control low-voltage signal unit (102), thereby regulate the generation of control low voltage voltage, current signal;
Low-voltage signal unit (102), be used for as the signal source that produces low voltage three-phase voltage, two-phase/three-phase current, and accept the parameters that current signal sensor (106) and voltage signal sensor (107) are fed back, to stablize the output of described low-voltage signal unit (102);
Power amplifier (103) is used for amplifying voltage, the current signal of described low-voltage signal unit (102) output, and voltage, the current signal after then will amplifying inputted respectively stepup transformer (104) and current lifting device (105);
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, up-flow provides the high voltage that suits the requirements, the signal of large electric current after processing;
Current signal sensor (106) and voltage signal sensor (107), be arranged on through carrying on the three-phase power line of high voltage, large current signal after described stepup transformer (104) and current lifting device (105) processing, be used for providing feedback signal to described low-voltage signal unit (102), stablize the voltage of this low-voltage signal unit (102), the output of current signal.
Wherein: described power amplifier (103) is numeric type power amplifier, switching 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 by one group of three-phase voltage increasing device with Y or the D mode of connection; 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 by introducing the signal of other surveying instrument Measurement accuracy, 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 implementation method of the experiment power supply for error check of high-voltage electric energy metering device, the method comprises:
A, obtain required three-phase experimental voltage after the three-phase voltage signal of low-voltage signal unit processed by power amplifier and stepup transformer; Be met required test current after the two-phase of described low-voltage signal unit output or three-phase low-voltage current signal processed by power amplifier and current lifting device;
B, the described trial voltage of employing carry out the noble potential clamper to the test current loop, make current return be in high-voltage, form the three-phase output of high-tension current;
C, voltage, the current signal of described experiment power supply output fed back to the low-voltage signal unit export adjusting after sampling.
Wherein: described steps A further comprises:
When corresponding to two elements method electric power meter, described low-voltage signal unit output two-phase low-tension current signal;
When corresponding to three element method electric power meter, described low-voltage signal unit output three-phase low-voltage current signal.
Step C is described to the process of feeding back after voltage, the current signal sampling to be:
When being used for two elements method electric power meter measured, described voltage signal sensor adopts the two standard sets voltage transformer (VT), and with V/V mode of connection output feedback signal; Perhaps adopt three groups of standard potential transformers, and with Y or D mode of connection output feedback signal; Perhaps adopt three groups of resitstance voltage divider, capacitive divider or RC divider output feedback signals relatively;
When being used for three element method electric power meter measured, described voltage signal sensor adopts three groups of standard potential transformers, and with Y or D mode of connection output feedback signal; Perhaps adopt three groups of resitstance voltage divider, capacitive divider or RC divider output feedback signals relatively;
When being used for two elements method electric power meter measured, described current signal sensor is used two groups;
When being used for three element method device for measurement of electrical energy measured, described current signal sensor is used three groups.
Realization provided by the present invention be used for experiment power supply and its implementation that high-voltage electric-energy meter carries out error checking, have the following advantages:
Experiment power supply of the present invention can reach the less power of output by independent design and the signal feedback of voltage, current return, can produce the requirement of satisfying the needed high voltage of site test, large current signal; Although its output power decreases, can make the volume and weight of this experiment power supply satisfy the requirement of field-checking convenience.
Description of drawings
Fig. 1 is the illustrative view of functional configuration of the experiment power supply of global error of high voltage energy metering installation verification of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiments of the invention method and apparatus of the present invention is described in further detail.
Basic thought of the present invention is: the experiment power supply of high-voltage electrical energy metering system is pressed the separately design of voltage, current source, and converge at high-voltage output end, by adopting special insulation processing and circuit structure, so that electric current and voltage forms different loops, thereby obtain lower powered high voltage, cranking test power supply.Described experiment power supply mainly by low-voltage signal source, voltage/current power amplifier, boost/current lifting device and feedback signal several parts of taking a sample consist of, by low-voltage signal source output low voltage voltage, current signal, obtain the voltage and current signal of certain power through the voltage/current power amplifier, and then by boosting/current lifting device output HIGH voltage current signal.The supply voltage of output depends on stepup transformer output, and electric current depends on current lifting device output, obtains the equivalent high-tension current experiment power supply that can control.The capacity of voltage segment only need to be considered the voltage circuit power consumption of voltage signal sensor, tested high-voltage electric-energy meter, loss and the test loop loss of stepup transformer, the capacity of current segment only need be considered current return power consumption and the test loop loss of current lifting device loss, current signal sensor, tested high-voltage electric-energy meter, thereby as long as provides respectively less power just can meet the demands.
Fig. 1 is the illustrative view of functional configuration of the experiment power supply of global error of high voltage energy metering installation verification of the present invention, as shown in Figure 1, 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.Wherein:
Here, phase angle can arrange in advance between described each phase current voltage, and voltage and current signal output effective value also can be set respectively certainly, the harmonic wave that on voltage and current signal, can superpose respectively, and output frequency can be set in 40 ~ 60 hertz of scopes.
Low-voltage signal unit 102 is used for the signal source that produces as low voltage three-phase voltage, two-phase (to two elements method electric power meter) or 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.
Here, described power amplifier 103 can be numeric type power amplifier, switching power amplifier, also can be linear power amplifier.
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 processes, be provided for the simulated conditions of work for high-voltage electric-energy meter 108, the input signal of high voltage, large electric current namely is provided.Described stepup transformer 104 be two groups independently stepup transformer with V/V mode of connection output, perhaps be three groups independently stepup transformer directly export by one group of three-phase voltage increasing device with Y or the D mode of connection.Described current lifting device 105 is two groups of all insulation current lifting devices (for two elements method electric power meter) or three groups of all insulation current lifting devices (for three element method electric power meter).
Here, the feedback signal sampling is finished by current signal sensor 106 and voltage signal sensor 107, they are separately positioned 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 to described low-voltage signal unit 102, with the voltage of stablizing this low-voltage signal unit 102, the output of current signal.Here, described voltage signal sensor 107 is for the two standard sets voltage transformer (VT) and with V/V mode of connection output (being used for two elements method electric power meter is measured); Perhaps being that three groups of standard potential transformers are exported (being used for three element method electric power meter is measured) with Y or the mode of connection, perhaps is that three groups of resistance, electric capacity or groups are relatively held voltage dividers; Described current signal sensor 106 is standard current transformer or shunt, and when being used for the two elements electric power meter measured, described current signal sensor 106 is used two groups; When being used for three element method electric power meter measured, then described current signal sensor 106 is used three groups, and described current sensor can be CT, shunt etc.
The mode that obtains the feedback signal of experiment power supply has: obtain the equal proportion signal by current signal sensor 106, voltage signal sensor 107, realize follow-up by direct introducing signal source; Or by introducing the signal of other surveying instrument Measurement accuracy, and read by described low-voltage signal unit 102 and to realize soft feedback.
High-voltage electric-energy meter 108 is used for connecting 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.
Here, described low-tension supply signal element 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 voltage signal sensor 106 and current 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 voltage signal sensor 106 and current signal sensor 107 is connected with described low-tension supply signal element 102 respectively.
The implementation method of described experiment power supply mainly comprises following process: 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; The two-phase of described low-voltage signal unit 102 outputs/three-phase low-voltage current signal (when the 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 with trial voltage the noble potential clamper is carried out in the test current loop, 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.
The method of the experiment power supply be used to realizing on-the-spot global error of high voltage energy metering installation verification provided by the present invention is applicable to the field-checking of high-voltage electric-energy meter 108.
The above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention.
Claims (4)
1. experiment power supply that is used for error check of high-voltage electric energy metering device, it is characterized in that: this 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), link to each other with described low-voltage signal unit (102), be used for inputting required voltage, current parameters, produce low voltage three-phase voltage signal and two-phase or three-phase current signal with control low-voltage signal unit (102), thereby regulate the generation of control low voltage voltage, current signal;
Low-voltage signal unit (102), be used for as the signal source that produces low voltage three-phase voltage, two-phase or three-phase current, and accept the parameters that current signal sensor (106) and voltage signal sensor (107) are fed back, to stablize the output of described low-voltage signal unit (102);
Power amplifier (103) is used for amplifying voltage, the current signal of described low-voltage signal unit (102) output, and voltage, the current signal after then will amplifying inputted respectively stepup transformer (104) and current lifting device (105); Described power amplifier (103) is numeric type power amplifier, switching power amplifier or linear power amplifier;
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, up-flow provides the high voltage and current that suits the requirements signal after processing;
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 to described low-voltage signal unit (102), stablize the voltage of this low-voltage signal unit (102), the output of current signal; Described current signal sensor (106) is shunt, and described current signal sensor (106) is used two groups or three groups;
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 by introducing the signal of other surveying instrument Measurement accuracy, and read by described low-voltage signal unit (102) and to realize soft feedback.
2. experiment power supply according to claim 1, 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 by one group of three-phase voltage increasing device with the output of Y or the D mode of connection; Described current lifting device (105) is two groups of all insulation current lifting devices or three groups of all insulation current lifting devices.
3. experiment power supply according to claim 1, 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.
4. implementation method that is used for the experiment power supply of error check of high-voltage electric energy metering device, it is characterized in that: the method comprises:
A, obtain required three-phase test voltage after the three-phase voltage signal of low-voltage signal unit processed by power amplifier and stepup transformer; The two-phase of described low-voltage signal unit output/three-phase low-voltage current signal is met required test current after processing by power amplifier and current lifting device; When corresponding to two elements method electric power meter, described low-voltage signal unit output two-phase low-tension current signal; When corresponding to three element method electric power meter, described low-voltage signal unit output three-phase low-voltage current signal;
B, the described trial voltage of employing carry out the noble potential clamper to the test current loop, make current return be in high-voltage, form the three-phase output of high-tension current;
C, voltage, the current signal of described experiment power supply output fed back to the low-voltage signal unit export adjusting after sampling; The described process that voltage, current signal are fed back after taking a sample is:
When being used for two elements method electric power meter measured, described voltage signal sensor adopts the two standard sets voltage transformer (VT), and with V/V mode of connection output feedback signal; Perhaps adopt three groups of standard potential transformers, and with Y or D mode of connection output feedback signal; Perhaps adopt three groups of resitstance voltage divider, capacitive divider or RC divider output feedback signals relatively;
When being used for three element method electric power meter measured, described voltage signal sensor adopts three groups of standard potential transformers, and with Y or D mode of connection output feedback signal; Perhaps adopt three groups of resitstance voltage divider, capacitive divider or RC divider output feedback signals relatively;
When being used for two elements method electric power meter measured, described current signal sensor is used two groups;
When being used for three element method device for measurement of electrical energy measured, described current signal sensor is used three groups.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102901945A (en) * | 2012-09-27 | 2013-01-30 | 陕西富集电力科技股份有限公司 | Integrated error checking system of electric energy meter |
| 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 |
| CN103913715B (en) * | 2014-04-23 | 2015-09-09 | 国家电网公司 | High-voltage measuring box error testing system and error testing method |
| CN107589391B (en) * | 2017-07-27 | 2020-09-15 | 武汉国测数据技术有限公司 | Method, device and system for detecting integral error of electric energy metering device |
| CN111025212B (en) * | 2019-11-27 | 2022-10-04 | 中国电力科学研究院有限公司 | Precise reverse-phase proportional booster circuit |
| CN112346000B (en) * | 2020-10-30 | 2022-07-08 | 国网山东省电力公司营销服务中心(计量中心) | Intelligent electric energy meter operation error data statistical processing system and method |
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| CN2594806Y (en) * | 2002-10-11 | 2003-12-24 | 国家电力公司南京电力自动化设备总厂 | Single phase ground setecting device for small current ground system |
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