CN206258511U - A kind of electric current, voltage ratio conversion and sampling apparatus - Google Patents
A kind of electric current, voltage ratio conversion and sampling apparatus Download PDFInfo
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- CN206258511U CN206258511U CN201621076646.9U CN201621076646U CN206258511U CN 206258511 U CN206258511 U CN 206258511U CN 201621076646 U CN201621076646 U CN 201621076646U CN 206258511 U CN206258511 U CN 206258511U
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- 238000005070 sampling Methods 0.000 title claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 title abstract description 13
- 238000004804 winding Methods 0.000 claims abstract description 125
- 230000004907 flux Effects 0.000 claims abstract description 34
- 238000001514 detection method Methods 0.000 claims description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 230000005611 electricity Effects 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 description 7
- 238000009413 insulation Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model discloses a kind of electric current, voltage ratio conversion and sampling apparatus, including a wide-range Zero flux current ratio converter, a biquadratic winding double-stage voltage transformer, two A/D sample circuits, one Wireless Telecom Equipment II, a dc source, a microprocessor II；Dc source is powered to Wireless Telecom Equipment II, microprocessor II and two A/D sample circuits；The A of biquadratic winding double-stage voltage transformer0End, ALThe P of end, 2n and wide-range Zero flux current ratio converter1End connection；The input V of A/D sample circuits IIN2a ends with biquadratic winding double-stage voltage transformer are connected, the input V of A/D sample circuits IIINWith the U of wide-range Zero flux current ratio converteriEnd connection.The utility model has reached the purpose of electric current of stopping a leak, while meeting the sampling of high pressure equipotential and the requirement measured directly of low pressure current potential.
Description
Technical field
The utility model is related to a kind of electric current, voltage ratio conversion and sampling apparatus, category Electric Measurement Technology field.
Background technology
High-voltage electric-energy meter sampling is related to electric current, the accurate measurement of magnitude of voltage under high pressure conditions, general measure
Method is to be entered high voltage, a high current scaling transformation again into after being easy to secondary voltage, the electric current of measurement by transformer
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, there can be certain point between first winding and Secondary Winding according to the principles of electric and electronic engineering
Cloth electric capacity and leakage reactance, leakage current will be produced when working voltage is applied between first winding and Secondary Winding, leakage electricity
Stream is formed with Current Transformer Secondary electric current and is superimposed, and makes the measurement generation additive error of electric current under high pressure conditions, causes high-tension electricity
Can measure inaccurate.
Utility model content
The purpose of this utility model is to provide a kind of electric current, voltage ratio conversion and sampling apparatus, with electric current of stopping a leak
Influence, and reach wide range measure purpose.
The utility model (1) uses the secondary current equipotential method of sampling, forces the secondary circuit of current ratio converter
With primary circuit equipotential, the voltage difference by current ratio converter primary circuit and secondary circuit is zero, reaches and stops a leak
The purpose of electric current；(2) using secondary voltage sample circuit and current sampling circuit equipotential method, the high accuracy of electric flux is met
The requirement of the necessary synchronized sampling of measurement electric current, magnitude of voltage；(3) to adapt to electric current, the measurement of voltage high pressure equipotential, using biquadratic
Winding double-stage voltage transformer replaces common voltage transformer, and common voltage transformer only has a Secondary Winding, and this practicality is new
On the basis of an original Secondary Winding is retained, it is two Secondary Windings with reference to current potential to increase by one with primary voltage to type；
Electric current described in the utility model, voltage ratio conversion and sampling apparatus include a wide-range Zero flux current ratio
Converter, a biquadratic winding double-stage voltage transformer, two A/D sample circuits, a Wireless Telecom Equipment II, one is straight
Stream power supply, a microprocessor II；Dc source is supplied to Wireless Telecom Equipment II, microprocessor II and two A/D sample circuits
Electricity；The first winding N of biquadratic winding double-stage voltage transformer1Hot end A0, Exciting Windings for Transverse Differential Protection NLHot end AL, two
Secondary winding N3Polar end 2n and wide-range Zero flux current ratio converter first winding polar end P1Connection, biquadratic around
The first winding N of group double-stage voltage transformer1Cold end X0With Exciting Windings for Transverse Differential Protection NLCold end XLConnection connection；A/D is adopted
The input V of sample circuit IINWith the Secondary Winding N of biquadratic winding double-stage voltage transformer3Non-polar end 2a connections, A/D adopts
The input V of sample circuit IIINWith the output voltage terminal U of wide-range Zero flux current ratio converteriConnection, A/D sample circuits
Ith, the earth terminal GND connections of the common port com and Wireless Telecom Equipment II, dc source of A/D sample circuits II, microprocessor
To the first winding polar end P of wide-range Zero flux current ratio converter1, with electric power meter overall inspection device once
Voltage equipotential；The control A/D of microprocessor II sample circuits I and A/D sample circuits II, the connection of microprocessor II radio communication set
Standby II.
The beneficial effects of the utility model are, using primary circuit and the equipotential current ratio converter of secondary circuit,
Make primary circuit be zero to secondary circuit potential difference, reach the purpose of electric current of stopping a leak.Because primary circuit is to secondary returning
Road potential difference is zero so that the insulation system of current ratio converter is simple, is easy to answering for wide-range zero-flux current transformer
With, rated secondary current is designed as 0.1A, increase the degree of accuracy that turn ratio is conducive to improving transformer, it is capable of achieving current range
Program controlled automatic switching, while reducing magnetic core and Secondary Winding wire cross-section area, make current ratio converter that there is volume
Small, lightweight, low cost, the advantages of be easy to integrated；Using biquadratic winding double-stage voltage transformer, while meeting high pressure etc.
Current potential is sampled and the requirement measured directly of low pressure current potential.
Brief description of the drawings
Fig. 1 is electric current, voltage ratio conversion and sampling apparatus schematic diagram；
Fig. 2 is wide-range Zero flux current ratio converter schematic diagram.
Symbol in figure：
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 converter first winding polar end, non-polar end；
W1----be wide-range Zero flux current ratio converter first winding；
W2----the be wide-range secondary ratio winding of Zero flux current ratio converter；
WT----be wide-range Zero flux current ratio converter secondary detection winding；
1st, 2---- is respectively wide-range Zero flux current ratio two annular cores of converter；
J01、J02、J03、J04、J05The secondary ratio winding range switching of ----be respectively wide-range zero-flux current transformer
Relay tip；
S1----the be secondary ratio winding polarity end of wide-range zero-flux current transformer；
S2、S3、S4、S5、S6----be wide-range zero-flux current transformer each range non-polar end of secondary ratio winding；
T1、T2----be respectively wide-range zero-flux current transformer secondary detection winding polarity end and non-polar end；
Ui----be wide-range Zero flux current ratio converter output voltage terminal；
R---- is wide-range Zero flux current ratio converter secondary current sample resistance；
VIN----be analog-digital conversion ic analog input end；
Com---- is common port；
Data bus---- are data/address bus；
GND---- is common port；
V+----be dc source；
Vcc----be integrated circuit operation power input；
Specific embodiment
Specific implementation step of the present utility model is further described below in conjunction with the accompanying drawings.
Electric current, voltage ratio conversion and sampling apparatus are as shown in attached 1, including a wide-range Zero flux current ratio conversion
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 one of biquadratic winding double-stage voltage transformer (202)
Secondary winding N1Hot end A0, Exciting Windings for Transverse Differential Protection NLHot end AL, Secondary Winding N3Polar end 2n and wide-range Zero flux
The first winding polar end P of current ratio converter (201)1Connection, biquadratic winding double-stage voltage transformer (202) is once
Winding N1Cold end X0With Exciting Windings for Transverse Differential Protection NLCold end XLConnection；The input V of A/D sample circuits I (203)INWith it is double
The Secondary Winding N of Secondary Winding double-stage voltage transformer (202)3Non-polar end 2a connection, A/D sample circuits II (204)
Input VINWith the output voltage terminal U of wide-range Zero flux current ratio converter (201)iConnection, A/D sample circuits I (203)
The common port com and Wireless Telecom Equipment II (205) of A/D sample circuits II (204), dc source (206), microprocessor
(207) earth terminal GND is connected to the first winding polar end P of wide-range Zero flux current ratio converter (201)1, with electricity
Can metering device overall inspection device primary voltage equipotential；The control A/D of microprocessor II (207) sample circuits I (203) and A/
Electric current, voltage signal after the conversion of the comparative example of D sample circuits II (204) are implemented synchronized sampling and data storage, and are calculated respectively
Go out current effective value, voltage effective value, active power, reactive power, electric energy, phase, computational methods are as follows：
Voltage effective value is calculated：
Current effective value is calculated：
Derive referring to《Electric energy metrical skill examination training materials》, China Electric Power Publishing House, Chen Xiangqun chief editors, P139~
P140；Average active power is calculated in a cycle：
Active energy is calculated in a cycle：
Derive referring to《Electric energy metrical skill examination training materials》, China Electric Power Publishing House, Chen Xiangqun chief editors, P97~
P98；
Average reactive power is calculated in a cycle：
Reactive energy is calculated in a cycle：
Derive referring to《Electric energy metrical skill examination training materials》, China Electric Power Publishing House, Chen Xiangqun chief editors, P133 power
Factor is calculated：
Derive referring to《Electric energy metrical skill examination training materials》, China Electric Power Publishing House, Chen Xiangqun chief editors, P135
In formula (1)~(8)：T --- the sine wave period time；
N --- the sampling number in a cycle；
U --- voltage effective value；
I --- current effective value；
P --- average active power in a cycle；
Q --- average reactive power in a cycle；
φ --- phase
I(tk) --- in tkThe current instantaneous value at moment；
U(tk) --- in tkThe instantaneous voltage at moment；
Δ t --- sampling time interval；
--- delayed tkThe current instantaneous value in a quarter cycle at moment；
Wide-range Zero flux current ratio converter (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 W1The circle of punching one, can be substituted during specific implementation by primary current wire；W2For secondary
Ratio winding, its tap S2、S3、S4、S5、S6Five current ranges of 1A, 5A, 20A, 100A, 500A are corresponded to respectively；WTIt is magnetic balance
Detection winding.The logical relation (being shown in Table 1) of current range and relay tip；WTThe T of winding1Connect the input of magnetic balance circuit signal
End Si, magnetic balance detection winding WTNon-polar end T2Meet common port com；Secondary ratio winding W2Polar end S1Connect output voltage
End Ui, secondary ratio winding W2Each range non-polar end S2、S3、S4、S5、S6The J of difference contact relay01、J02、J03、J04、J05
Opening and closing contact, relay J01~J05Fixed contact meet the current output terminal I of magnetic balance detection and drive circuit0；Current sampling
Resistance R is connected on secondary ratio winding W2Polar end S1With the common port com of wide-range Zero flux current ratio converter it
Between.The common port com of magnetic balance detection and drive circuit meets the common port com of wide-range Zero flux current ratio converter.
Wherein, magnetic balance detection winding is uniformly wound on annular core I 1, and then annular core II 2 is embedded in annular core I 1
Portion, then ratio winding is uniformly wound on annular core I 1 and annular core II 2.First winding is also uniformly wound on annular iron
On core I 1 and annular core II 2.
Table 1
Note：" √ " represents junction closure in table, and "×" represents that contact disconnects.
Umber of turn is calculated：
According to current transformer general principle, primary current and the product of the first winding number of turn be equal to secondary current with it is secondary around
The product of the group number of turn, i.e.,：
I1W1=I2W2……………(9)
In formula：
I1、I2Respectively primary current, secondary current；
W1、W2Respectively the first winding number of turn, the Secondary Winding number of turn；
Due to W1It is 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
Reference picture 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 iron
On core, Exciting Windings for Transverse Differential Protection NLHot end ALWith first winding N1Hot end A0Connection, Exciting Windings for Transverse Differential Protection NLCold end XL
With first winding N1Cold end X0Connection；Secondary Winding N3Polar end 2n and first winding N1Hot end A0Connection,
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 ends, from Secondary Winding N2Polar end 1n draw 1n ends, from Secondary Winding N3It is non-
Polar end 2a draws 2a ends.
Electric current of the present utility model, voltage ratio conversion and sampling apparatus making step are as follows：
(1) wide-range Zero flux current ratio converter (201), first winding W are built1The circle of punching one, during specific implementation
Can be substituted by a high current wire；W2It is 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；WTIt is 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
Magnetic balance detection and the common port com of drive circuit；Secondary ratio winding W2S1Meet voltage output end Ui, secondary ratio winding
W2Each range non-polar end S2、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 circuit0；Current sampling resistor R is connected on S1With
Between common port com.The common port com of magnetic balance detection and drive circuit connects the public affairs of wide-range Zero flux current ratio converter
Com is held altogether, wherein, magnetic balance detection winding is uniformly wound on annular core 1, and annular core 2 then is embedded in into annular iron
Inside core 1, then ratio winding is uniformly wound on annular core 1 and annular core 2.First winding is also uniformly wound on annular
On iron core 1 and annular core 2.
(2) electric current, voltage ratio conversion and sampling unit are built：The one of biquadratic winding double-stage voltage transformer (202)
Secondary winding N1Hot end A0, Exciting Windings for Transverse Differential Protection NLHot end AL, Secondary Winding N3Polar end 2n and wide-range Zero flux
The first winding polar end P of current ratio converter (201)1Connection, biquadratic winding double-stage voltage transformer (202) is once
Winding N1Cold end X0With Exciting Windings for Transverse Differential Protection NLCold end XLConnection；The input V of A/D sample circuits I (203)INWith it is double
The Secondary Winding N of Secondary Winding double-stage voltage transformer (202)3Non-polar end 2a connection, A/D sample circuits II (204)
Input VINWith the output voltage terminal U of wide-range Zero flux current ratio converter (201)iConnection, A/D sample circuits I (203)
With the common port com of A/D sample circuits II (204) and Wireless Telecom Equipment II (205), dc source (206), microprocessor II
(207) earth terminal GND is connected to the first winding polar end P of wide-range Zero flux current ratio converter (201)1, with electricity
Can metering device overall inspection device primary voltage equipotential.
The content not being described in detail in the utility model specification belongs to the known technology of professional and technical personnel in the field.
Claims (4)
1. a kind of electric current, voltage ratio are converted and sampling apparatus, it is characterised in that：Including a wide-range Zero flux current ratio
Converter (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 one of biquadratic winding double-stage voltage transformer (202)
Secondary winding N1Hot end A0, Exciting Windings for Transverse Differential Protection NLHot end AL, Secondary Winding N3Polar end 2n and wide-range Zero flux
The first winding polar end P of current ratio converter (201)1Connection, biquadratic winding double-stage voltage transformer (202) is once
Winding N1Cold end X0With Exciting Windings for Transverse Differential Protection NLCold end XLConnection；The input V of A/D sample circuits I (203)INWith it is double
The Secondary Winding N of Secondary Winding double-stage voltage transformer (202)3Non-polar end 2a connection, A/D sample circuits II (204)
Input VINWith the output voltage terminal U of wide-range Zero flux current ratio converter (201)iConnection, A/D sample circuits I (203)
The common port com and Wireless Telecom Equipment II (205) of A/D sample circuits II (204), dc source (206), microprocessor
(207) earth terminal GND is connected to the first winding polar end P of wide-range Zero flux current ratio converter (201)1, with electricity
Can metering device overall inspection device primary voltage equipotential；The control A/D of microprocessor II (207) sample circuits I (203) and A/
D sample circuits II (204), the connection Wireless Telecom Equipment II (205) of microprocessor II (207).
2. electric current according to claim 1, voltage ratio are converted and sampling apparatus, it is characterised in that：The wide-range zero
Flux current scaling converter (201) including a zero-flux current transformer, current/voltage-converted sampling resistor,
One magnetic balance detection and drive circuit, five ratio winding range switching relay J01、J02、J03、J04、J05, first winding
W1, secondary ratio winding W2, magnetic balance detection winding WT；Magnetic balance detection winding WTPolar end T1Connect magnetic balance detection and drive
The signal input part S of circuiti, magnetic balance detection winding WTNon-polar end T2Termination magnetic balance detection and drive circuit it is public
End com；Secondary ratio winding W2Polar end S1Meet output end Ui, secondary ratio winding W2Each range non-polar end S2、S3、
S4、S5、S6The J of end difference contact relay01、J02、J03、J04、J05Opening and closing contact, relay J01~J05Fixed contact connect magnetic recording level
Weighing apparatus detection and the current output terminal I of drive circuito；Current sampling resistor R is connected on S1Between com terminals；Magnetic balance detect and
The common port com of drive circuit meets the common port com of whole wide-range Zero flux current ratio converter (201).
3. electric current according to claim 2, voltage ratio are converted and sampling apparatus, it is characterised in that：Wherein, magnetic balance inspection
Survey winding to be uniformly wound on annular core I (1), annular core II (2) is then embedded in the inside of annular core I (1), then will
Ratio winding is uniformly wound on annular core I (1) and annular core II (2), and 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 are converted and sampling apparatus, it is characterised in that：The 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 A0Connection, 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 A0Connection, Secondary Winding N3Non-polar end 2a set
In first winding N1Hot end A0Side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621076646.9U CN206258511U (en) | 2016-09-23 | 2016-09-23 | A kind of electric current, voltage ratio conversion and sampling apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621076646.9U CN206258511U (en) | 2016-09-23 | 2016-09-23 | A kind of electric current, voltage ratio conversion and sampling apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206258511U true CN206258511U (en) | 2017-06-16 |
Family
ID=59022332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621076646.9U Withdrawn - After Issue CN206258511U (en) | 2016-09-23 | 2016-09-23 | A kind of electric current, voltage ratio conversion and sampling apparatus |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443154A (en) * | 2016-09-23 | 2017-02-22 | 国网江西省电力公司电力科学研究院 | Current and voltage ratio transformation and sampling device |
| CN107765057A (en) * | 2017-09-26 | 2018-03-06 | 李颖 | A kind of improved two-stage current transformer |
| CN109212293A (en) * | 2018-10-18 | 2019-01-15 | 中国电力科学研究院有限公司 | A kind of power supply type voltage transformer and application method with voltage measurement function |
| CN113241245A (en) * | 2021-05-10 | 2021-08-10 | 大连北方互感器集团有限公司 | Current transformer with constant-value resistor and preparation method thereof |
-
2016
- 2016-09-23 CN CN201621076646.9U patent/CN206258511U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443154A (en) * | 2016-09-23 | 2017-02-22 | 国网江西省电力公司电力科学研究院 | Current and voltage ratio transformation and sampling device |
| CN106443154B (en) * | 2016-09-23 | 2020-02-28 | 国网江西省电力公司电力科学研究院 | Current and voltage proportional transformation and sampling device |
| CN107765057A (en) * | 2017-09-26 | 2018-03-06 | 李颖 | A kind of improved two-stage current transformer |
| CN109212293A (en) * | 2018-10-18 | 2019-01-15 | 中国电力科学研究院有限公司 | A kind of power supply type voltage transformer and application method with voltage measurement function |
| CN109212293B (en) * | 2018-10-18 | 2021-04-02 | 中国电力科学研究院有限公司 | Power supply type voltage transformer with voltage metering function and use method |
| CN113241245A (en) * | 2021-05-10 | 2021-08-10 | 大连北方互感器集团有限公司 | Current transformer with constant-value resistor and preparation method thereof |
| CN113241245B (en) * | 2021-05-10 | 2022-03-11 | 大连北方互感器集团有限公司 | Current transformer with constant-value resistor and preparation method thereof |
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