CN106443154A - Current and voltage ratio transformation and sampling device - Google Patents
Current and voltage ratio transformation and sampling device Download PDFInfo
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- CN106443154A CN106443154A CN201610846685.0A CN201610846685A CN106443154A CN 106443154 A CN106443154 A CN 106443154A CN 201610846685 A CN201610846685 A CN 201610846685A CN 106443154 A CN106443154 A CN 106443154A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/08—Circuits for altering the measuring range
- G01R15/09—Autoranging circuits
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- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a current and voltage ratio transformation and sampling device, and the device comprises a wide-range zero flux current ratio converter, a double-secondary-winding double-stage voltage mutual inductor, two A/D sampling circuits, a wireless communication apparatus II, a DC power supply, and a microprocessor II. The DC power supply supplies power to the wireless communication apparatus II, the microprocessor II and two A/D sampling circuits. The A0, AL and 2n ends of the double-secondary-winding double-stage voltage mutual inductor are connected with the P1 end of the wide-range zero flux current ratio converter. The input ends VIN of the A/D sampling circuits are connected with 2a end of the double-secondary-winding double-stage voltage mutual inductor, and the input ends VIN of the A/D sampling circuits are connected with the Ui end of the wide-range zero flux current ratio converter. The device achieves a purpose of eliminating a leaked current, and meets the requirements of high-voltage equipotential sampling and low-voltage level direct measurement.
Description
Technical field
The present invention relates to the conversion of a kind of electric current, voltage ratio and sampling apparatuses, belong to Electric Measurement Technology field.
Background technology
High-voltage electric-energy meter sampling is related to the accurate measurement to the electric current under high pressure conditions, magnitude of voltage, general measure
Method is to enter after high voltage, high current scaling transformation are become the secondary voltage being easy to measure, electric current by transformer again
Row measurement (as shown in Figure 1), because first winding and the Secondary Winding of current transformer are insulation and are equably wound on same
On one magnetic core and the factor such as insulation quality, can there is certain point between first winding and Secondary Winding according to the principles of electric and electronic engineering
Cloth electric capacity and leakage reactance, apply to produce leakage current during working voltage between first winding and Secondary Winding, this leakage electricity
Stream is formed with Current Transformer Secondary electric current and is superimposed, and makes the measurement of electric current under high pressure conditions produce additive error, leads to high-tension electricity
Can measure inaccurate.
Content of the invention
It is an object of the invention to provide the conversion of a kind of electric current, voltage ratio and sampling apparatuses, with the shadow of electric current of stopping a leak
Ring, and reach wide range measure purpose.
The present invention (1) adopts the secondary current isoelectric level method of sampling, forces the secondary circuit and of current ratio changer
Minor loop isoelectric level, the voltage difference by current ratio changer primary circuit and secondary circuit is zero, reaches electric current of stopping a leak
Purpose；(2) adopt secondary voltage sample circuit and current sampling circuit isoelectric level method, meet the high-acruracy survey of electric flux
The requirement of the necessary synchronized sampling of electric current, magnitude of voltage；(3) it is to adapt to electric current, the measurement of voltage high pressure isoelectric level, using biquadratic winding
Double-stage voltage transformer replaces common voltage transformer, and common voltage transformer only has a Secondary Winding, and the present invention is retaining
On the basis of an original Secondary Winding, increase by two Secondary Winding that is reference current potential with primary voltage；
Electric current of the present invention, voltage ratio conversion and sampling apparatuses include a wide-range Zero flux current ratio conversion
Device, a biquadratic winding double-stage voltage transformer, two A/D sample circuits, a Wireless Telecom Equipment II, a unidirectional current
Source, a microprocessor II；DC source is powered to Wireless Telecom Equipment II, microprocessor II and two A/D sample circuits；Double
The A of Secondary Winding double-stage voltage transformer0End, ALThe P of end, 2n and wide-range Zero flux current ratio changer1End connects, double
The X of Secondary Winding double-stage voltage transformer0End and XLEnd connects；The input V of A/D sample circuit IINWith biquadratic winding twin-stage
The 2a end of voltage transformer connects, the input V of A/D sample circuit IIINU with wide-range Zero flux current ratio changeri
End connects, A/D sample circuit I, the common port com of A/D sample circuit II and Wireless Telecom Equipment II, DC source, Wei Chu
The earth terminal GND of reason device connects to the P of wide-range Zero flux current ratio changer1End, with electric power meter overall inspection
Device primary voltage isoelectric level；Microprocessor II controls A/D sample circuit I and A/D sample circuit II, and microprocessor II connects no
Line communication equipment II.
The invention has the beneficial effects as follows, using primary circuit and secondary circuit equipotential current ratio changer, make one
Minor loop is zero to secondary circuit potential difference, has reached the purpose of electric current of stopping a leak.Because primary circuit is to secondary circuit electricity
Potential difference is zero so that the insulation system of current ratio changer is simple, is easy to the application of wide-range zero-flux current transformer, will
Rated secondary current is designed as 0.1A, increases turn ratio and is conducive to improving the accuracy of transformer, the journey of achievable current range
Control is automatically switched, and reduces magnetic core and Secondary Winding wire cross-section area simultaneously, makes current ratio changer have small volume, weight
Amount is light, low cost, the advantages of be easy to integrated；Using biquadratic winding double-stage voltage transformer, meet high pressure isoelectric level simultaneously
Sampling and the requirement measured directly of low pressure current potential.
Brief description
Fig. 1 is electric current, voltage ratio conversion and sampling apparatuses schematic diagram；
Fig. 2 is wide-range Zero flux current ratio changer schematic diagram.
In figure symbol：
TVG----be biquadratic winding double-stage voltage transformer；
A0、X0----be respectively biquadratic winding double-stage voltage transformer first winding N1Hot end, cold end；
AL、XL----be respectively biquadratic winding double-stage voltage transformer Exciting Windings for Transverse Differential Protection NLHot end, cold end；
1a, 1n---- are respectively biquadratic winding double-stage voltage transformer Secondary Winding N2Non-polar end, polar end；
2a, 2n---- are respectively biquadratic winding double-stage voltage transformer Secondary Winding N3Non-polar end, polar end；
I1----be primary current；
P1、P2----be respectively wide-range Zero flux current ratio changer first winding polar end, non-polar end；
W1----be wide-range Zero flux current ratio changer first winding；
W2----the be secondary ratio winding of wide-range Zero flux current ratio changer；
WT----be wide-range Zero flux current ratio changer secondary detection winding；
1st, 2---- is respectively wide-range two annular cores of Zero flux current ratio changer；
J01、J02、J03、J04、J05----be respectively wide-range zero-flux current transformer secondary ratio winding range switching
Relay tip；
S1----be wide-range zero-flux current transformer Secondary Winding polar end；
S2、S3、S4、S5、S6----the be each range non-polar end of wide-range zero-flux current transformer Secondary Winding；
T1、T2----be respectively wide-range zero-flux current transformer secondary magnetic balance detection winding polar end and nonpolar
End；
Ui----be wide-range Zero flux current ratio changer output voltage terminal；
R---- is wide-range Zero flux current ratio changer secondary current sample resistance；
VIN----be analog-digital conversion ic analog input end；
Com---- is common port；
Data bus---- is data/address bus；
GND---- is common port；
V+----be DC source；
Vcc----be integrated circuit operation power input；
Specific embodiment
Below in conjunction with the accompanying drawings the specific implementation step of the present invention is further described.
Electric current, voltage ratio conversion and sampling apparatuses, as shown in attached 1, convert including a wide-range Zero flux current ratio
Device (201), biquadratic winding double-stage voltage transformer (202), two A/D sample circuits, a Wireless Telecom Equipment II
(205) a, DC source (206), a microprocessor II (207)；DC source (206) is to Wireless Telecom Equipment II
(205), microprocessor II (207) and two A/D sample circuits are powered；The A of biquadratic winding double-stage voltage transformer (202)0
End, ALThe P of end, 2n and wide-range Zero flux current ratio changer (201)1End connects, biquadratic winding double-stage voltage transformer
(202) X0End and XLEnd connects；The input V of A/D sample circuit I (203)INWith biquadratic winding double-stage voltage transformer
(202) 2a end connects, the input V of A/D sample circuit II (204)INWith wide-range Zero flux current ratio changer (201)
UiEnd connection, the common port com of A/D sample circuit I (203) A/D sample circuit II (204) and Wireless Telecom Equipment II
(205), DC source (206), the earth terminal GND of microprocessor (207) connect to wide-range Zero flux current ratio changer
(201) P1End, with electric power meter overall inspection device primary voltage isoelectric level；Microprocessor II (207) controls A/D to adopt
Electric current after sample circuit I (203) and the conversion of A/D sample circuit II (204) comparative example, voltage signal implement synchronized sampling data
Storage, and calculate current effective value, voltage effective value, active power, reactive power, electric energy, phase place respectively, computational methods are such as
Under：
Voltage effective value calculates：
Current effective value calculates：
Derive referring to《Electric energy metrical skill examination training materials》, China Electric Power Publishing House, Chen Xiangqun edits, P139～
P140；
In a cycle, average active power calculates：
In a cycle, active energy calculates：
Derive referring to《Electric energy metrical skill examination training materials》, China Electric Power Publishing House, Chen Xiangqun edits, P97～
P98；
In a cycle, average reactive power calculates：
In a cycle, reactive energy calculates：
Derive referring to《Electric energy metrical skill examination training materials》, China Electric Power Publishing House, Chen Xiangqun edits, P133 power
Factor calculates：
Derive referring to《Electric energy metrical skill examination training materials》, China Electric Power Publishing House, Chen Xiangqun edits, P135
In formula (1)～(8)：The T sine wave period time；
Sampling number in n a cycle；
U voltage effective value；
I current effective value；
Average active power in P a cycle；
Average reactive power in Q a cycle；
φ phase place
I(tk) in tkThe current instantaneous value in moment；
U(tk) in tkThe instantaneous voltage in moment；
Δ t sampling time interval；
Delayed tkThe current instantaneous value in a quarter cycle in moment；
Wide-range Zero flux current ratio changer (201) is as shown in Figure 2.Including a zero-flux current transformer,
One current/voltage-converted sampling resistor, a magnetic balance detection and drive circuit, five ratio winding ranges switch relay
Device J01、J02、J03、J04、J05.First winding W1Punching one circle, can be substituted by primary current wire when being embodied as；W2For secondary
Ratio winding, its tap S2、S3、S4、S5、S6Correspond to five current ranges of 1A, 5A, 20A, 100A, 500A respectively；WTFor magnetic balance
Detection winding.Current range and the logical relation (being shown in Table 1) of relay tip；WTThe T of winding1Connect the input of magnetic balance circuit signal
End Si, WTThe T of winding2Connect com end；W2The S of winding1Meet outfan Ui, W2The S of winding2、S3、S4、S5、S6End contact relay respectively
J01、J02、J03、J04、J05Opening and closing contact, relay J01～J05Fixed contact connect the electric current of magnetic balance detection and drive circuit
Outfan I0；Current sampling resistor R is connected on S1And common port com end between.The com of magnetic balance detection and drive circuit connects public affairs
Hold com altogether.Wherein, magnetic balance detection winding is uniformly wound on annular core I 1, then annular core II 2 is embedded in annular
Inside iron core I 1, then ratio winding is uniformly wound on annular core I 1 and annular core II 2.First winding also uniformly coiling
On annular core I 1 and annular core II 2.
Table 1
Note：In table, " √ " represents junction closure, and "×" represents that contact disconnects.
Umber of turn calculates：
According to current transformer ultimate principle, primary current and the first winding number of turn long-pending be equal to secondary current with secondary around
The group number of turn is long-pending, that is,：
I1W1=I2W2……………(9)
In formula：
I1、I2It is respectively primary current, secondary current；
W1、W2It is respectively the first winding number of turn, the Secondary Winding number of turn；
Due to W1For 1 circle, I2=0.1A is then：
Each range Secondary Winding is composed in series by sectional wind coil, and each section of umber of turn is shown in Table 2：
Table 2
With reference to Fig. 1, biquadratic winding double-stage voltage transformer includes first order iron core, second level iron core, Exciting Windings for Transverse Differential Protection NL
It is wound on first order iron core, first winding N1With Secondary Winding N2, Secondary Winding N3It is wound on first order iron core and second level ferrum
On core, Exciting Windings for Transverse Differential Protection NLHot end ALWith first winding N1Hot end A0Connect, Exciting Windings for Transverse Differential Protection NLCold end XL
With first winding N1Cold end X0Connect；Secondary Winding N3Polar end 2n and first winding N1Hot end A0Connect,
Secondary Winding N3Non-polar end 2a be arranged on first winding N1Hot end A0Side.Secondary Winding N3Non-polar end 2a
With first winding N1Cold end X0Insulation distance should be not less than first winding N1Hot end A0With first winding N1's
Cold end X0Distance.Secondary Winding N3Non-polar end 2a and first winding N1Hot end A0Between insulation distance should
Not less than 2mm.From first winding N1Hot end A0Draw A0End, from first winding N1Cold end X0Draw X0End, from
Secondary Winding N2Non-polar end 1a draw 1a end, from Secondary Winding N2Polar end 1n draw 1n end, from Secondary Winding N3Non-
Polar end 2a draws 2a end.
The electric current of the present invention, voltage ratio conversion and sampling apparatuses making step are as follows：
(1) wide-range Zero flux current ratio changer (201), first winding W are built1Punching one circle, when being embodied as
Can be substituted by a high current wire；W2For secondary ratio winding, its tap S2、S3、S4、S5、S6Respectively correspond to 1A, 5A, 20A,
Five current ranges of 100A, 500A, rated secondary current is 0.1A；WTFor magnetic balance detection winding.Current range and relay
The logical relation of contact is shown in Table 1；WTThe T of winding1Meet the signal input part S of magnetic balance detection and drive circuiti, WTThe T of winding2Connect
The com end of magnetic balance detection and drive circuit；W2The S of winding1Meet outfan Ui, W2The S of winding2、S3、S4、S5、S6End connects respectively
The J of relay01、J02、J03、J04、J05Opening and closing contact, relay J01～J05Fixed contact connect magnetic balance detection and drive circuit
Current output terminal I0；Current sampling resistor R is connected on S1And com terminal between.The com of magnetic balance detection and drive circuit connects
Common port com, wherein, magnetic balance detection winding is uniformly wound on annular core 1, then annular core 2 is embedded in annular
Inside iron core 1, then ratio winding is uniformly wound on annular core 1 and annular core 2.First winding is also uniformly wound on ring
On shape iron core 1 and annular core 2.
(2) electric current, voltage ratio conversion and sampling unit are built：The A of biquadratic winding double-stage voltage transformer (202)0
End, ALThe P of end, 2n and wide-range Zero flux current ratio changer (201)1End connects, biquadratic winding double-stage voltage transformer
(202) X0End and XLEnd connects；The input V of A/D sample circuit I (203)INWith biquadratic winding double-stage voltage transformer
(202) 2a end connects, the input V of A/D sample circuit II (204)INWith wide-range Zero flux current ratio changer (201)
UiEnd connection, A/D sample circuit I (203) and A/D sample circuit II (204) common port com and Wireless Telecom Equipment II
(205), DC source (206), the earth terminal GND of microprocessor II (207) connect to the conversion of wide-range Zero flux current ratio
The P of device (201)1End, with electric power meter overall inspection device primary voltage isoelectric level.
The content not being described in detail in description of the invention belongs to the known technology of professional and technical personnel in the field.
Claims (6)
1. a kind of electric current, voltage ratio conversion and sampling apparatuses it is characterised in that：Including a wide-range Zero flux current ratio
Changer (201), biquadratic winding double-stage voltage transformer (202), two A/D sample circuits, a radio communication sets
Standby II (205), a DC source (206), a microprocessor II (207)；DC source (206) is to Wireless Telecom Equipment II
(205), microprocessor II (207) and two A/D sample circuits are powered；The A of biquadratic winding double-stage voltage transformer (202)0
End, ALThe P of end, 2n and wide-range Zero flux current ratio changer (201)1End connects, biquadratic winding double-stage voltage transformer
(202) X0End and XLEnd connects；The input V of A/D sample circuit I (203)INWith biquadratic winding double-stage voltage transformer
(202) 2a end connects, the input V of A/D sample circuit II (204)INWith wide-range Zero flux current ratio changer (201)
UiEnd connection, the common port com of A/D sample circuit I (203) A/D sample circuit II (204) and Wireless Telecom Equipment II
(205), DC source (206), the earth terminal GND of microprocessor (207) connect to wide-range Zero flux current ratio changer
(201) P1End, with electric power meter overall inspection device primary voltage isoelectric level；Microprocessor II (207) controls A/D to adopt
Sample circuit I (203) and A/D sample circuit II (204), microprocessor II (207) connects Wireless Telecom Equipment II (205).
2. electric current according to claim 1, voltage ratio conversion and sampling apparatuses it is characterised in that：Described wide-range zero
Flux current scaling converter (201) include zero-flux current transformer, current/voltage-converted sampling resistor,
One magnetic balance detection and drive circuit, five ratio winding ranges switch relay J01、J02、J03、J04、J05, first winding
W1, secondary ratio winding W2, magnetic balance detection winding WT；Magnetic balance detection winding WTT1Connect magnetic balance detection and drive circuit
Signal input part Si, magnetic balance detection winding WTT2The com end of termination drive circuit；Secondary ratio winding W2Polar end S1Connect
Outfan Ui, secondary ratio winding W2S2、S3、S4、S5、S6The J of end difference contact relay01、J02、J03、J04、J05Opening and closing contact,
Relay J01～J05Fixed contact meet the current output terminal I of magnetic balance detection and drive circuito；Current sampling resistor R connects
In S1And com terminal between；The com of magnetic balance detection and drive circuit meets common port com.
3. electric current according to claim 2, voltage ratio conversion and sampling apparatuses it is characterised in that：Wherein, magnetic balance inspection
Survey winding to be uniformly wound on annular core I (1), then annular core II (2) is embedded in annular core I (1) inside, then will
Ratio winding is uniformly wound on annular core I (1) and annular core II (2).First winding is also uniformly wound on annular core I
(1) and on annular core II (2).
4. electric current according to claim 1, voltage ratio conversion and sampling apparatuses it is characterised in that：Described biquadratic around
Group double-stage voltage transformer includes first order iron core, second level iron core, Exciting Windings for Transverse Differential Protection NLBe wound on first order iron core, once around
Group N1With Secondary Winding N2, Secondary Winding N3It is wound on first order iron core and second level iron core, Exciting Windings for Transverse Differential Protection NLHot end
ALWith first winding N1Hot end A0Connect, Exciting Windings for Transverse Differential Protection NLCold end XLWith first winding N1Cold end X0Even
Connect；Secondary Winding N3Polar end 2n and first winding N1Hot end A0Connect, Secondary Winding N3Non-polar end 2a setting
In first winding N1Hot end A0Side.
5. electric current according to claim 4, voltage ratio conversion and sampling apparatuses it is characterised in that：Secondary Winding N3Non-
Polar end 2a and first winding N1Cold end X0Insulation distance should be not less than first winding N1Hot end A0With once
Winding N1Cold end X0Distance.
6. electric current according to claim 4, voltage ratio conversion and sampling apparatuses it is characterised in that：From first winding N1's
Hot end A0Draw A0End, from first winding N1Cold end X0Draw X0End, from Secondary Winding N2Non-polar end 1a draw
Go out 1a end, from Secondary Winding N2Polar end 1n draw 1n end, from Secondary Winding N3Non-polar end 2a draw 2a end.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610846685.0A CN106443154B (en) | 2016-09-23 | 2016-09-23 | Current and voltage proportional transformation and sampling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610846685.0A CN106443154B (en) | 2016-09-23 | 2016-09-23 | Current and voltage proportional transformation and sampling device |
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| Publication Number | Publication Date |
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| CN106443154A true CN106443154A (en) | 2017-02-22 |
| CN106443154B CN106443154B (en) | 2020-02-28 |
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ID=58166139
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| CN201610846685.0A Active CN106443154B (en) | 2016-09-23 | 2016-09-23 | Current and voltage proportional transformation and sampling device |
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Cited By (2)
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| CN109065343A (en) * | 2018-07-10 | 2018-12-21 | 中国电力科学研究院有限公司 | A kind of high-pressure double-stage voltage transformer |
| CN115453176A (en) * | 2022-11-07 | 2022-12-09 | 南方电网数字电网研究院有限公司 | Sensitivity-switchable current mutual inductance device and current detection device |
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| CN106443154B (en) | 2020-02-28 |
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Inventor after: Jin Shaoping Inventor after: Chen Chen Inventor after: Luo Li Inventor after: Xie Chaohui Inventor after: Lin Fenghao Inventor after: Yu Weimin Inventor after: Liu Jian Inventor after: Li Dongjiang Inventor after: Guo Quanhui Inventor after: Li Min Inventor after: Deng Wuping Inventor after: Wang Xun Inventor after: Wu Yu Inventor after: Yang Aichao Inventor before: Jin Shaoping Inventor before: Luo Li Inventor before: Xie Chaohui Inventor before: Lin Fenghao Inventor before: Yu Weimin Inventor before: Liu Jian Inventor before: Li Dongjiang Inventor before: Li Min Inventor before: Deng Wuping Inventor before: Wang Xun Inventor before: Wu Yu Inventor before: Yang Aichao Inventor before: Chen Chen |
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