CN207281135U - A kind of electrical energy measurement conversion equipment - Google Patents
A kind of electrical energy measurement conversion equipment Download PDFInfo
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- CN207281135U CN207281135U CN201720890281.1U CN201720890281U CN207281135U CN 207281135 U CN207281135 U CN 207281135U CN 201720890281 U CN201720890281 U CN 201720890281U CN 207281135 U CN207281135 U CN 207281135U
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Abstract
The utility model belongs to Electric Energy Metering Technology field, and in particular to a kind of electrical energy measurement conversion equipment.The present apparatus includes being sequentially arranged voltage transformer and current transformer along the electric current direct of travel of triple line, and current transformer is connected in the corresponding phase line of triple line correspondingly for three and using subtractive polarity connection；Voltage transformer uses Yyn connections, terminal of voltage transformer is connected in triple line correspondingly, the secondary terminals of voltage transformer draw and form the voltage output interface for connecting energy measurement instruments respectively, and the ground terminal n of voltage transformer makees grounding.The device can enable the existing 3 × 220V/380V energy measurement instruments in China to realize that slitless connection uses in the grid-connected photovoltaic plant of 480V/315V/270V voltage class.
Description
Technical field
The utility model belongs to Electric Energy Metering Technology field, and in particular to a kind of electrical energy measurement conversion equipment.
Background technology
8kW less photovoltaic power stations are generally with 220V normal voltage access systems, 8kW and above photovoltaic plant inverter outlet
Generally use three-phase system；And in order to make photovoltaic plant reach maximum conversion efficiency, reduce investment outlay, photovoltaic plant exit potential leads to
It is grid-connected frequently with voltage class such as 315V/380V/315V/270V.At present, except grid-connected using 220/380V standard voltage grades
Photovoltaic plant can use the existing energy measurement instruments metering of country outer, the grid-connected light of other 480V/315V/270V voltage class
Overhead utility cannot be measured in low-pressure side using the existing energy measurement instruments of country.Therefore, at present using exit potential
The boosting that can only use different model for the grid-connected photovoltaic plant of 480V/315V/270V voltage class becomes, and also rises to voltage
It is grid-connected in 10kV sides after 10kV, and measured in 10kV sides.With the deep propulsion of national precisely photovoltaic help-the-poor policy, in order to save
About help-the-poor capital, all encourages to concentrate grid-connected access module using the access of low pressure multiple spot, respectively metering and high pressure, this requires each
A grid entry point is both needed to be measured in low-pressure side, it is clear that the existing electric energy metered system of country constrains the development of above-mentioned pattern.
In view of this, some scientific research schemes are applicable in the electric energy meter of different voltages grade to develop at present, but this need to formulate it is a series of
Electric energy meter standard and a series of test of kilo watthour meter standard, and State Grid Corporation of China supporting must also develop series of standards and come
The use of new electric energy meter is adapted to, this is undoubtedly a huge system engineering, and quantities is equivalent to existing national electrical energy measurement body
Several times of quantities of system, it is very undesirable with greater need for huge financial support and cost of labor.How to seek a kind of suitable for upper
The new electric energy conversion metering system of situation is stated, so that on the premise of using the existing energy measurement instruments of country, is realized
To exit potential using the grid-connected synchronism detection demand of 315V/380V/315V/270V voltage class, and it can ensure that test data
Accuracy, the technical barrier urgently to be resolved hurrily in recent years for this area.
The content of the invention
The purpose of the utility model is to overcome above-mentioned the deficiencies in the prior art, there is provided a kind of electrical energy measurement conversion equipment,
The device can enable the existing 3 × 220V/380V energy measurement instruments in China grid-connected in 480V/315V/270V voltage class
Photovoltaic plant realize that slitless connection uses, and can synchronously ensure the accuracy of test data.
To achieve the above object, the utility model employs following technical scheme：
A kind of electrical energy measurement conversion equipment, it is characterised in that：The present apparatus include along triple line electric current direct of travel and according to
Secondary arrangement voltage transformer and current transformer, wherein：Current transformer is for three and one-to-one using subtractive polarity connection
It is connected in the corresponding phase line of triple line, 1TA-S1 interfaces, 1TA-S2 interfaces, 2TA-S1 interfaces, the 2TA-S2 of current transformer connect
Mouth, 3TA-S1 interfaces and 3TA-S2 interfaces draw and form the current output interface for connecting energy measurement instruments respectively,
And 1TA-S2 interfaces, 2TA-S2 interfaces and 3TA-S2 interfaces are grounded；Voltage transformer uses Yyn connections, voltage transformer
One time terminal is connected in triple line correspondingly, and the secondary terminals of voltage transformer are drawn and formed for connecting electric energy respectively
The voltage output interface of measurement meter, the ground terminal n of voltage transformer make grounding.
The beneficial effects of the utility model are：
1), the utility model is by adding voltage transformer, so that the linkage by voltage transformer and current transformer
Adjust, can prevent the grid-connected photovoltaic plant low-pressure side of 480V/315V/270V voltage class can not be by existing 3 × 220V/380V
The defects of energy measurement instruments measure, efficiently solves the photovoltaic plant of the voltage class access system such as 480V/315V/270V
Measuring problem, and avoid the electric energy meter because developing different voltages grade and to formulate new electric energy meter standard required a large amount of
Fund input, save the manpower and materials cost of flood tide.The utility model makes the existing 3 × 220V/380V electric energy meter in China
Scale meter can realize that slitless connection uses in the grid-connected photovoltaic plant of 480V/315V/270V voltage class, and make different voltages etc.
Level photovoltaic plant access system mode it is more flexible, while expanded significantly photovoltaic plant multiple spot access, respectively metering and
High pressure concentrates the scope of grid integration pattern, can effectively promote the progress of national precisely photovoltaic help-the-poor policy.By this practicality
New given above device, the utility model can not only realize the existing electric energy metered system in China in 480V/315V/270V
Etc. the accurate metering of the photovoltaic plant low-pressure side of voltage class access, meanwhile, it is also the existing 3 × 220V/380V electric energy meter in China
Scale meter non-220V/380V network systems metering provide theoretical foundation and use for reference function, finally for China existing 3 ×
220V/380V energy measurement instruments provide direct basis in the metering of non-220V/380V network systems.
Brief description of the drawings
Fig. 1 is the apparatus structure schematic diagram of the utility model；
Fig. 2 is the wiring state figure of the utility model and 3 × 220V/380V energy measurement instruments；
Fig. 3 is existing 380V photovoltaic plants electric energy meter wiring diagram.
Embodiment
For ease of understanding, here in connection with Fig. 1-2, concrete structure and working method to the utility model are made further below
Description：
As shown in Figs. 1-2, its external interface is divided into three parts to the electrical energy measurement conversion equipment of the utility model：Power input
Port, output port of power source and energy measurement instruments output interface.
Part I is power input port, is L1-1, L1-2 and L1-3 in Fig. 1.
Part II is output port of power source, is L2-1, L2-2 and L2-3 in Fig. 1.
Part III is energy measurement instruments output interface, is divided into voltage output interface and current output interface, such as Fig. 1 institutes
Showing, wherein secondary terminals a, secondary terminals b and secondary terminals c and ground terminal n are voltage output interface, and 1TA-S1 interfaces,
1TA-S2 interfaces, 2TA-S1 interfaces, 2TA-S2 interfaces, 3TA-S1 interfaces and 3TA-S2 interfaces are current output interface.
Device back panel wiring is divided into two parts：Voltage transformer and current transformer.
Voltage transformer uses Yyn wiring.Terminal A of voltage transformer, a terminal B as shown in Figure 1 and once
Terminal C meets power input port L1-1, power input port L1-2 and power input port L1-3 respectively；The two of voltage transformer
Secondary terminal a, secondary terminals b and secondary terminals c and ground terminal n are drawn respectively, and the voltage output for forming energy measurement instruments connects
Mouthful, ground terminal n ground connection.
Current transformer totally three, each phase of triple line installs 1 respectively, using subtractive polarity connection.Current transformer
1TA-S1 interfaces, 1TA-S2 interfaces, 2TA-S1 interfaces, 2TA-S2 interfaces, 3TA-S1 interfaces and 3TA-S2 interfaces draw respectively,
Form the current output interface of energy measurement instruments.1TA-S2 interfaces, 2TA-S2 interfaces and 3TA-S2 interfacing grounds.
During actual progress metrological operation, as shown in Figure 1, photovoltaic plant can directly use 3 × 220V/380V standard three
Four line active electric energy meter of phase coordinates above-mentioned electrical energy measurement conversion equipment to be measured.
Using the electricity of the power input port of triple line as actual electricity w1, with the electricity at the secondary terminals of voltage transformer
Measure to measure electricity w2, then
In formula, w1For actual electricity (kWh)；
w2For metering electricity (kWh)；
U1For voltage (V) at the power input port of triple line；
U2For the voltage output interface voltage (V) of voltage transformer；
Npt is voltage transformer no-load voltage ratio；
I1For electric current (A) at the power input port of triple line；
I2For electric current (A) at the current output interface of current transformer；
Nct is current transformer ratio；
For power factor；
T is the time (h)；
3 × 220V/380V three-phase and four-line active electric energy meter voltage adaptation scopes of standard are 0.8~1.2Un, i.e., 304~
456V, meanwhile, existing 380V photovoltaic plants electric energy meter wiring as shown in figure 3, at this time due to no external voltage mutual inductor,
So that the existing 3 × 220V/380V energy measurement instruments input voltage no-load voltage ratio in China is defaulted as 1.Current transformer ratio is also fixed
For (10,15,20,25,30,40,50,60,75,100,150,200,250,300,400,500,600,750,800,1000,
1200th, 1250)/5, i.e., to strain ratio value for 2,3,4,5,6,8,10,12,15,20,30,40,50,60,80,100,120,
150th, 160,200,240 and 250, it is impossible to any setting.
Obviously, if after using the utility model, electric energy meter still presses Nct setting current multiplying powers, and generated energy will be caused to measure
Mistake.In order not to which above erroneous metrology occurs, formula (2) can be done with down conversion, obtain equation below (3),
W at this time2Regard 315V/315V/270V voltage class built photovoltaic power station power generation amount variables as.
If Nct*Npt in formula (3) is defined as to the synthesis conversion ratio Nzh of electrical energy measurement conversion equipment, by electrical energy meter electricity
Stream multiplying power adjusted by Nzh, then generated energy metric results will not deviation, realize the voltage class photovoltaic plant such as 480V/315V/270V
Electrical energy measurement.
From the foregoing, as long as reasonably selecting electrical energy measurement conversion equipment voltage transformer no-load voltage ratio (Npt), electricity can just be limited
Conversion equipment output voltage can be measured, meets the access of 3 × 220V/380V electric energy meters of standard, meanwhile, electric energy meter current multiplying power
Adjusted by the synthesis conversion ratio Nzh of electrical energy measurement conversion equipment, it is ensured that accurate metering.But the existing metering system electricity of country
Energy table current ratio is not adjusted arbitrarily, but adjusted by current transformer standard transformation ratio selection.
Therefore, if the present apparatus need to meet the existing 3 × 220V/380V energy measurement instruments access demand in China, need to meet with
Lower condition：
A, quota output voltage must be between 304~456V；
B, above-mentioned Npt*Nct namely comprehensive no-load voltage ratio must be 2,3,4,5,6,8,10,12,15,20,30,40,50,60,
80th, 100,120,150,160,200,240 and 250 one of which.
At this time, different voltages grade photovoltaic plant electrical energy measurement conversion equipment voltage transformer can use following table no-load voltage ratio
(Npt), electrical energy measurement conversion equipment output voltage is made to be adapted to 3 × 220V/380V three-phase and four-line active electric energy meters of standard.
The existing low-voltage electric energy metering table principle in China is access low voltage and electric current at present.Normal voltage is Un (Un=
380V), meet that its fluctuation range value is satisfied by measuring requirement, i.e., input voltage requirement for 0.8~1.2 times of normal voltage (304~
456V)；Electric current is by selecting suitable transformation ratio current transformer to be converted to the electric current of 5A.And 480/315/270V is not meeting
In metered voltage fluctuation range, it is impossible to be directly accessed kilowatt-hour meter.To meet that such voltage measurement must be by increasing in the present apparatus
Voltage transformer, it is necessary to nonstandard voltage 480/315/270V is converted to 304~456V in the voltage range for meet measuring requirement,
Ratio calculated is (1.05~1.58)/(0.69~1.03)/(0.59~0.89), and 480/380=1.26,315/380=
0.82,270/380=0.71, it is more accurate that the voltage for needing to consider to input kilowatt-hour meter at this time is then measured closer to normal voltage.Together
When, it is also necessary to take into account that meet be multiplied by current transformer ratio value (i.e. 2,3,4,5,6,8,10,12,15,20,30,40,50,
60th, 80,100,120,150,160,200,240,250) after still within existing multiplier value (i.e. 2,3,4,5,6,8,10,12,
15、20、30、40、50、60、80、100、120、150、160、200、240、250).So far, the present apparatus voltage multiplying power selection with
1.26/0.82/0.71 immediate voltage multiplier value 1.25/0.8/0.67 be multiplied by existing current ratio value (i.e. 2,3,4,5,6,
8th, 10,12,15,20,30,40,50,60,80,100,120,150,160,200,240,250) after by permutation and combination, one by one
Contrast draw the synthesis multiplying power of the condition of satisfaction for (5,10,15,50,100,150,250)/(2,4,8,10,20,40,80,100,
160、200、240)/(2、4、8、10、20、40、100、160、200).If select other voltage transformer no-load voltage ratio (i.e. voltages times
Rate) then result of calculation (i.e. comprehensive multiplying power) is unsatisfactory for existing change ratio, and voltage deviation causes greatly measurement error big.Therefore 480/
The final of voltage change ratio determines that value is 1.25/0.8/0.67 used by 315/270V output voltages.Mutual induction of voltage in following table
The no-load voltage ratio of device, namely photovoltaic plant inverter outlet voltage divided by normal voltage, are with reference to obtained after above-mentioned condition：
The selection of electrical energy measurement conversion equipment current transformer ratio (Nct) is most important, is electrical energy measurement conversion equipment
Existing 3 × 220V/380V standards three-phase and four-line the active electric energy meter of country can be realized in voltages such as 480V/315V/270V etc.
The key point of the photovoltaic plant Accurate Measurements of Electric Energy of level.The selection of electrical energy measurement conversion equipment current transformer ratio (Nct)
It should consider the size of photovoltaic plant capacity, while the synthesis conversion ratio Nzh that should also take into account electrical energy measurement conversion equipment can marked
Adjusted in quasi- electric energy meter measuring system.
After the no-load voltage ratio of voltage transformer is obtained, according to the Npt*Nct in step 1) namely comprehensive no-load voltage ratio must be 2,3,
4th, 5,6,8,10,12,15,20,30,40,50,60,80,100,120,150,160,200,240 and 250 one of which will
Ask, by permutation and combination, judge whether comprehensive no-load voltage ratio meets the demand, you can obtain the phase strain ratio of current transformer, most
Following form is obtained eventually：
The selection and installation of current transformer and voltage transformer are carried out by above table, passes through 3 × 220V/380V electricity
Energy measurement meter, carries out the metrological operation of the photovoltaic plant grid-connected to 480V/315V/270V voltage class.
Claims (1)
- A kind of 1. electrical energy measurement conversion equipment, it is characterised in that：The present apparatus include along triple line electric current direct of travel and successively Arrange voltage transformer and current transformer, wherein：Current transformer is connect correspondingly for three and using subtractive polarity connection In in the corresponding phase line of triple line, the 1TA-S1 interfaces of current transformer, 1TA-S2 interfaces, 2TA-S1 interfaces, 2TA-S2 interfaces, 3TA-S1 interfaces and 3TA-S2 interfaces draw and form the current output interface for connecting energy measurement instruments respectively, and 1TA-S2 interfaces, 2TA-S2 interfaces and 3TA-S2 interfaces are grounded；Voltage transformer uses Yyn connections, and the one of voltage transformer Secondary terminal is connected in triple line correspondingly, and the secondary terminals of voltage transformer are drawn and formed based on connecting electric energy respectively The voltage output interface of scale meter, the ground terminal n of voltage transformer make grounding.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720890281.1U CN207281135U (en) | 2017-07-21 | 2017-07-21 | A kind of electrical energy measurement conversion equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720890281.1U CN207281135U (en) | 2017-07-21 | 2017-07-21 | A kind of electrical energy measurement conversion equipment |
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| Publication Number | Publication Date |
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| CN207281135U true CN207281135U (en) | 2018-04-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107345975A (en) * | 2017-07-21 | 2017-11-14 | 国家电网公司 | A kind of method of electric energy metrical conversion equipment and the application device |
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- 2017-07-21 CN CN201720890281.1U patent/CN207281135U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107345975A (en) * | 2017-07-21 | 2017-11-14 | 国家电网公司 | A kind of method of electric energy metrical conversion equipment and the application device |
| CN107345975B (en) * | 2017-07-21 | 2023-10-13 | 国网安徽省电力公司铜陵供电公司 | Electric energy metering conversion device and method for applying same |
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Granted publication date: 20180427 |