CN106371051A - High-voltage electric energy metering device current transformer leakage current eliminating method - Google Patents

High-voltage electric energy metering device current transformer leakage current eliminating method Download PDF

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Publication number
CN106371051A
CN106371051A CN201610846951.XA CN201610846951A CN106371051A CN 106371051 A CN106371051 A CN 106371051A CN 201610846951 A CN201610846951 A CN 201610846951A CN 106371051 A CN106371051 A CN 106371051A
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China
Prior art keywords
voltage
winding
current
transformer
current transformer
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CN201610846951.XA
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CN106371051B (en
Inventor
靳绍平
李东江
刘见
李敏
单鹏
刘经昊
李金喜
周春芽
杨爱超
吴世康
陈琛
冯文霞
李俊
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

The present invention provides a high-voltage electric energy metering device current transformer leakage current eliminating method. According to the method, the potential of the primary loop of a current transformer is made to be equal to the potential of the secondary loop of the current transformer, so that voltage between the primary loop and the secondary loop of the current transformer is zero, and therefore, leakage current can be eliminated; and a double-secondary winding two-stage voltage transformer is adopted to replace an ordinary voltage transformer in a high-voltage electric energy metering device. With the method of the invention adopted, voltage and current synchronous sampling can be carried out under a high-voltage equipotential state, and therefore, a voltage withstand requirement for the current transformer can be lowered, and cost for purchasing a high-voltage current transformer can be saved; and leakage current elimination of the high-voltage electric energy metering device can be achieved.

Description

A kind of high-voltage electric-energy meter current transformer leakage current removing method
Technical field
The present invention relates to a kind of high-voltage electric-energy meter current transformer leakage current removing method, 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
The purpose of the present invention is, in order to solve to apply working voltage u between first winding and Secondary WindingeWhen will produce Leakage current ix(Fig. 2), this leakage current 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, lead to high voltage electric energy measurement inaccurate.Need to solve electric current under key issue high pressure conditions mutual The leakage current of sensor, that is, electric current of stopping a leak.The invention provides a kind of high-voltage electric-energy meter current transformer leakage Electric current removing method.
The technical solution adopted in the present invention is: a kind of high-voltage electric-energy meter current transformer leakage current elimination side Method it is characterised in that: make the primary circuit of current transformer and secondary circuit isoelectric level, so that once the returning of current transformer Voltage between road and secondary circuit is zero, reaches the purpose of electric current of stopping a leak.
Further preferably, the common electricity in high-voltage electric-energy meter is replaced using biquadratic winding double-stage voltage transformer Pressure transformer；
Described biquadratic winding double-stage voltage transformer tvg, including first order iron core, second level iron core, first order iron core Side coiling Exciting Windings for Transverse Differential Protection nl, coiling first winding n on the opposite side of first order iron core and second level iron core1And Secondary Winding n2, Secondary Winding n3.Secondary Winding n2It is to be Secondary Winding with reference to current potential with ground potential, Secondary Winding n3It is with primary voltage High-voltage be Secondary Winding with reference to current potential；Exciting Windings for Transverse Differential Protection nlHot end alWith first winding n1Hot end a0 Connect, Exciting Windings for Transverse Differential Protection nlCold end xlWith first winding n1Cold end x0Connect；Secondary Winding n3Polar end 2n with First winding n1Hot end a connect, Secondary Winding n3Non-polar end 2a be arranged on first winding n1Hot end a0One Side；From first winding n1Hot end a0Draw a0Terminal, from Secondary Winding n3Non-polar end 2a draw 2a terminal；
Biquadratic winding double-stage voltage transformer tvgA0Terminal connects first winding non-polar end p2, biquadratic winding pair The 2a terminal of step voltage transformer connects the v of voltage sample analog-digital conversion ic a/d1inEnd；
Present invention also offers a kind of high-voltage electric-energy meter, including biquadratic winding double-stage voltage transformer tvg, electricity Current transformer ta, analog-digital conversion ic a/d1 and a/d2, central processing unit cpu, communication module, DC source, backstage pc；
The invention has the characteristics that:
(1) isoelectric level measurement electric current, voltage, using current transformer primary circuit and secondary circuit isoelectric level method, makes Current transformer primary circuit is zero with the voltage of secondary circuit, reaches the purpose of electric current of stopping a leak；(2) adopt dual stage voltage Common voltage transformer replaced by transformer, and common voltage transformer only has a Secondary Winding, and the present invention is retaining original one On the basis of Secondary Winding, increase by two Secondary Winding that is reference current potential with primary voltage；(3) electric current, voltage measurement list Unit is in high-voltage state, and by central processing unit cpu control electric current, voltage measurement unit synchronized sampling, cpu is by electric current, voltage Synchronized sampling value exports to communication module, is transmitted to the backstage pc being in zero potential state by optical cable, radio communication etc., solves High voltage and the isolating problem of zero potential data transfer；(4) high-voltage of primary voltage is designed as the reference of measuring circuit Current potential；(5) DC source is in high-voltage state, solves the isolating problem of high voltage and zero potential power supply.
The invention has the beneficial effects as follows, using current transformer primary circuit and secondary circuit isoelectric level method, make electric current Transformer primary circuit is zero to the potential difference of secondary circuit, reaches the purpose of electric current of stopping a leak.For coordinating high pressure isoelectric level Current sample mode of operation, is carried out under the sampling suitable high pressure isoelectric level state of voltage, using biquadratic winding bipolar voltage mutual inductance Device tvgReplace voltage transformer tv, biquadratic winding bipolar voltage transformer tvg2a end design near primary voltage height The a of piezoelectric position0Fig. 4, the analog quantity input v of a/d1 are seen in end sideinMeet biquadratic winding bipolar voltage transformer tvg2a End, the analog quantity input com of a/d1 meets biquadratic winding bipolar voltage transformer tvgThe a of ratio winding0End, realizes voltage and surveys Amount unit and high pressure isoelectric level measure；The method makes the resistance to pressure request of current transformer is reduced, and can save and purchase high pressure The expense of current transformer；Said method can achieve that high-voltage electric-energy meter leakage current eliminates.Have that method is succinct, warp Ji, science, practicality, workable, low cost and other advantages.
Brief description
Fig. 1 is conventional high-pressure electric power meter schematic diagram；
Fig. 2 is that under high pressure conditions, current transformer produces leakage current schematic diagram；
Fig. 3 is common bipolar voltage transformer schematic diagram；
Fig. 4 is high-voltage electric-energy meter current transformer leakage current removing method schematic diagram；
In figure symbol:
Tv---- is voltage transformer；
A, x---- are respectively voltage transformer first winding hot end, cold end；
A, x---- are respectively secondary windings of PT hot end, cold end；
Ta---- is current transformer；
p1、p2----be respectively current transformer first winding polar end, non-polar end；
s1、s2----be respectively secondary winding in current transformer polar end, non-polar end；
i1----be current transformer primary current；
i2----be Current Transformer Secondary electric current；
ix----be current transformer leakage current；
r2、r3----be respectively voltage transformer secondary output voltage divider resistance；
R---- is respectively the current/voltage-converted resistance of Current Transformer Secondary output；
tvg----be biquadratic winding double-stage voltage transformer；
nl----Exciting Windings for Transverse Differential Protection；
n1----first winding；
n2、n3----Secondary Winding；
a0、x0----first winding hot end, cold end；
al、xl----Exciting Windings for Transverse Differential Protection hot end, cold end；
1a, 1n---- Secondary Winding n2Non-polar end, polar end；
2a, 2n---- Secondary Winding n3Non-polar end, polar end；
----primary voltage vector；
----Secondary Winding n2Voltage vector；
----Secondary Winding n3Voltage vector；
----Exciting Windings for Transverse Differential Protection nlCurrent phasor；
----first winding n1Current phasor；
--- an inductive electric potential vector of-first order transformer；
----n1Inductive electric potential vector on two iron cores for the winding；
zl----nlThe internal impedance of winding；
z1----n1The internal impedance of winding；
z′2----convert n once2The internal impedance of winding；
z′3----convert n once3The internal impedance of winding；
ym1--- the excitation admittance of-first order transformer；
ym2--- the excitation admittance of-second level transformer；
----convert n once2Winding voltage vector；
----convert n once3Winding voltage vector；
A/d1, a/d2---- are respectively voltage, electric current analog-digital conversion ic；
vin----be analog-digital conversion ic analog input end；
Com---- is integrated circuit common port；
Data bus---- is data/address bus；
Cpu---- is high-pressure side central processing unit；
Gnd---- is common port；
v+----be DC source；
vcc----be integrated circuit operation power input；
Z---- is current transformer once to the impedance between Secondary Winding；
DC source ----it is high-pressure side DC source；
Communication module ----it is the telecommunication circuit such as wireless；
Specific embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
Generally electric energy measurement method is to become to be easy to survey by high voltage, a high current scaling transformation by current transformer The secondary voltage of amount, electric current, current transformer primary voltage is working voltage ue, secondary winding in current transformer polar end s1Or Secondary winding in current transformer non-polar end s2Ground connection (see Fig. 2), if current transformer first winding is to Current Transformer Secondary The voltage of winding is u1, current transformer first winding is z to the electric capacity of secondary winding in current transformer and leakage reactance resultant impedance, Then leakage current ixFor:
i x = u 1 z ... ... ( 1 )
The primary circuit of application claims current transformer and secondary circuit isoelectric level, when Secondary Winding is in the high electricity of operation (see Fig. 4), u during piezoelectric position1=0, then: ix=0, reach the purpose of electric current of stopping a leak.
Using biquadratic winding double-stage voltage transformer tv as shown in Figure 4g, including first order iron core, second level iron core, Side coiling Exciting Windings for Transverse Differential Protection n of first order iron corel, coiling first winding n on the opposite side of first order iron core and second level iron core1 With Secondary Winding n2, Secondary Winding n3.Secondary Winding n2It is to be Secondary Winding with reference to current potential with ground potential, Secondary Winding n3For High-voltage with primary voltage is the Secondary Winding with reference to current potential.Exciting Windings for Transverse Differential Protection nlHot end alWith first winding n1's Hot end a0Connect, Exciting Windings for Transverse Differential Protection nlCold end xlWith first winding n1Cold end x0Connect；Secondary Winding n3's Polar end 2n and first winding n1Hot end a connect, Secondary Winding n3Non-polar end 2a be arranged on first winding n1Height Potential end a0Side.From first winding n1Hot end a0Draw a0Terminal, from first winding n1Cold end x0Draw x0 Terminal, from Secondary Winding n2Non-polar end 1a draw 1a terminal, from Secondary Winding n2Polar end 1n draw 1n terminal, from two Secondary winding n3Non-polar end 2a draw 2a terminal.
As shown in figure 4, the common electricity in high-voltage electric-energy meter is replaced using biquadratic winding double-stage voltage transformer Pressure transformer, common voltage transformer only has a Secondary Winding, and the present invention, on the basis of retaining an original Secondary Winding, increases Plus one with two Secondary Winding that primary voltage is with reference to current potential.The a of biquadratic winding double-stage voltage transformer0Terminal connects First winding non-polar end p2, the 2a terminal connection integrated electricity of voltage sample analog digital conversion of biquadratic winding double-stage voltage transformer The v of road a/d1inEnd.
As shown in figure 4, a kind of electric current eliminating current transformer leakage current of the present invention, voltage sampling apparatus bag Include: biquadratic winding double-stage voltage transformer tvg, current transformer ta, voltage sample analog-digital conversion ic a/d1 and electricity Stream sampling analog-digital conversion ic a/d2, central processing unit cpu, communication module, DC source, backstage pc.
A kind of step of high-voltage electric-energy meter current transformer leakage current removing method is as follows:
1st, the capital equipment that this method adopts:
Biquadratic winding double-stage voltage transformer tvg, current transformer ta, voltage sample analog-digital conversion ic a/ D1, current sample analog-digital conversion ic a/d2, communication module, backstage pc；
2nd, central processing unit cpu passes through data/address bus data bus and voltage sample analog-digital conversion ic a/d1, electricity The data port of stream sampling analog-digital conversion ic a/d2 connects, and central processing unit cpu passes through the i/o of i/o mouth and communication module Mouth connects；
3rd, communication module sends data to the backstage pc being in zero potential state by optical cable, radio communication etc.；
4th, the com end of voltage sample analog-digital conversion ic a/d1, current sample analog-digital conversion ic a/d2 Com end, the gnd end of central processing unit cpu, the gnd end of DC source, the s of ta1And p2End, tvgA1And a0End all with once electric Pressure input uhConnect；
5th, resistance r1It is connected on bis- s of current transformer ta1End and s2Between end, current sample analog-digital conversion ic The analog quantity input v of a/d2inWith bis- s of current transformer ta2End connects；
6th, the analog quantity input v of voltage sample analog-digital conversion ic a/d1inMutual with biquadratic winding bipolar voltage Sensor tvg2a end connect；
7th, biquadratic winding bipolar voltage transformer tvgX1End, x0End and primary voltage input ulConnect；
8th, the v of DC source+Termination central processing unit cpu, voltage sample analog-digital conversion ic a/d1, current sample Analog-digital conversion ic a/d2, the v of communication moduleccEnd；
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 (5)

1. a kind of high-voltage electric-energy meter current transformer leakage current removing method it is characterised in that: make current transformer Primary circuit and secondary circuit isoelectric level so that the voltage between the primary circuit of current transformer and secondary circuit is Zero, reach the purpose of electric current of stopping a leak.
2. high-voltage electric-energy meter current transformer leakage current removing method according to claim 1, its feature exists In:
Using biquadratic winding double-stage voltage transformer tvg, current transformer ta, voltage sample analog-digital conversion ic a/d1, Current sample analog-digital conversion ic a/d2, communication module, backstage pc；Step is as follows:
1st, central processing unit cpu is adopted by data/address bus data bus and voltage sample analog-digital conversion ic a/d1, electric current The data port of sample analog-digital conversion ic a/d2 connects, and microprocessor cpu is connected with the i/o mouth of communication module by i/o mouth；
2nd, communication module is wirelessly communicated with the backstage pc being in zero potential state；
3rd, the com end of voltage sample analog-digital conversion ic a/d1, the com of current sample analog-digital conversion ic a/d2 End, the gnd end of central processing unit cpu, the gnd end of DC source, the s of current transformer ta1End, biquadratic winding dual stage voltage Transformer tvgA1And a0The p all with current transformer ta for the end2End connects；
4th, resistance r is connected on bis- s of current transformer ta1End and s2Between end, current sample analog-digital conversion ic a/d2's Analog quantity input vinWith bis- s of current transformer ta2End connects；
5th, the analog quantity input v of voltage sample analog-digital conversion ic a/d1inWith biquadratic winding double-stage voltage transformer tvgAnalog quantity input vinEnd connects；
6th, biquadratic winding double-stage voltage transformer tvgXlEnd and x0End connects；
7th, the v of DC source+Termination central processing unit cpu, voltage sample analog-digital conversion ic a/d1, current sample modulus Converter ic a/d2, the v of communication moduleccEnd.
3. high-voltage electric-energy meter current transformer leakage current removing method according to claim 2, its feature exists In:
Common voltage transformer in high-voltage electric-energy meter is replaced using biquadratic winding double-stage voltage transformer；
Described biquadratic winding double-stage voltage transformer, including first order iron core, second level iron core, the side of first order iron core around Exciting Windings for Transverse Differential Protection n processedl, coiling first winding n on the opposite side of first order iron core and second level iron core1With Secondary Winding n2, secondary around Group n3.Secondary Winding n2It is to be Secondary Winding with reference to current potential with ground potential, Secondary Winding n3It is the high-voltage with primary voltage It is the Secondary Winding with reference to current potential；Exciting Windings for Transverse Differential Protection nlHot end alWith first winding n1Hot end a0Connect, excitation around Group nlCold end xlWith first winding n1Cold end x0Connect；Secondary Winding n3Polar end 2n and first winding n1's Hot end a connects, Secondary Winding n3Non-polar end 2a be arranged on first winding n1Hot end a0Side；From once around Group n1Hot end a0Draw a0Terminal, from Secondary Winding n3Non-polar end 2a draw 2a terminal.
4. high-voltage electric-energy meter current transformer leakage current removing method according to claim 3, its feature exists In: a of biquadratic winding double-stage voltage transformer0Terminal connects first winding non-polar end p2, biquadratic winding dual stage voltage is mutual The 2a terminal of sensor connects the signal input part v of voltage sample analog-digital conversion ic a/d1in.
5. high-voltage electric-energy meter current transformer leakage current removing method according to claim 2, its feature exists In: described communication module is fiber optic communications devices or radio communication device.
CN201610846951.XA 2016-09-23 2016-09-23 A kind of high-voltage electric-energy meter current transformer leakage current removing method Active CN106371051B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3878455A (en) * 1972-10-06 1975-04-15 Philips Corp Circuit arrangement for measuring the filament emission current of a cathode-ray or x-ray tube
CN202735387U (en) * 2012-07-21 2013-02-13 马任德 Electric current transformer based on fiber vibration sensor
CN103592491A (en) * 2013-11-26 2014-02-19 国家电网公司 Current isolation mutual inductor
CN204332669U (en) * 2014-12-26 2015-05-13 大连第一互感器有限责任公司 High-voltage electric-energy meter integral combined transformer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3878455A (en) * 1972-10-06 1975-04-15 Philips Corp Circuit arrangement for measuring the filament emission current of a cathode-ray or x-ray tube
CN202735387U (en) * 2012-07-21 2013-02-13 马任德 Electric current transformer based on fiber vibration sensor
CN103592491A (en) * 2013-11-26 2014-02-19 国家电网公司 Current isolation mutual inductor
CN204332669U (en) * 2014-12-26 2015-05-13 大连第一互感器有限责任公司 High-voltage electric-energy meter integral combined transformer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
邢福全，谭艳华: "母线式电流互感器使用等电位线的机理", 《变压器》 *

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