CN108802476A - A kind of DC current transformer and its current test method - Google Patents

A kind of DC current transformer and its current test method Download PDF

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Publication number
CN108802476A
CN108802476A CN201810607197.3A CN201810607197A CN108802476A CN 108802476 A CN108802476 A CN 108802476A CN 201810607197 A CN201810607197 A CN 201810607197A CN 108802476 A CN108802476 A CN 108802476A
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CN
China
Prior art keywords
conductive bar
current
max
ammeter
wiring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201810607197.3A
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Chinese (zh)
Inventor
王金钉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guizhou Power Grid Co Ltd
Original Assignee
Guizhou Power Grid Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guizhou Power Grid Co Ltd filed Critical Guizhou Power Grid Co Ltd
Priority to CN201810607197.3A priority Critical patent/CN108802476A/en
Publication of CN108802476A publication Critical patent/CN108802476A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only

Abstract

The invention discloses a kind of DC current transformer and its current test methods, including conductive bar (1), conductive bar (1) is provided at least three wiring holes (2) on its length direction, conductive bar (1) both ends are connected on DC line (3), multiple wiring holes (2) from left to right in first be connected to ammeter (4) after any wiring thereafter.The present invention by conductive bar set fixed proportion electric current than wiring hole, when measuring the actual current of ammeter, you can know the size of current of total DC line, this is simple in structure, at low cost, convenient test be easy.

Description

A kind of DC current transformer and its current test method
Technical field
The present invention relates to a kind of DC current transformer and its current test methods, belong to DC current transformer technology neck Domain.
Background technology
When being tested for 500A or more D.C. high-currents, existing general ammeter is difficult to measure, and is required to high-end direct current Ammeter measures, complicated, makes and purchase cost is high.
Invention content
The technical problem to be solved by the present invention is to：A kind of DC current transformer and its current test method are provided, with solution Certainly problems of the prior art.
The technical solution that the present invention takes is：A kind of DC current transformer, including conductive bar, conductive bar is along its length At least three wiring holes are provided on direction, conductive bar both ends are connected on DC line, multiple wiring holes from left to right in One be connected to ammeter after any wiring thereafter.
Preferably, above-mentioned conductive bar uses platinum alloy or copper alloy.
A kind of current test method of DC current transformer, this method are：Setting conductive bar from left to right connects for first Resistance between string holes and the last one wiring hole is R, first wiring hole and any wiring before the last one wiring hole Resistance between hole is R', and the maximum current of conductive bar is Imax, when the electric current maximum of conductive bar, ammeter test maximum current is I'max, I'maxMuch smaller than Imax, I' is determined by scaling methodmaxSize, R' correspond to the actually measured stream of ammeter of one section of connection The electric current of overcurrent table is I', conductive bar (1) by electric current be I, therefore have：
In formula：K is no-load voltage ratio；
Had by formula (1) deformation
I in formulamaxAnd I'maxIt is known that I' is measured by ammeter, conductive bar (1) it is practical by electric current I can acquire.
Beneficial effects of the present invention：Compared with prior art, effect of the invention is as follows：
1) electric current of the invention by conductive bar setting fixed proportion is than wiring hole, when the actual current for measuring ammeter When, you can know the size of current of total DC line, this is simple in structure, and making is low with purchase cost, and convenient test is easy, test It is safe；
2) multiple instrument connections are set, are tested convenient for multiple ranges of different range, application range is wider.
Description of the drawings
Fig. 1 is the structural schematic diagram of the present invention；
Fig. 2 is the measuring principle schematic diagram of the present invention.
Specific implementation mode
Below in conjunction with the accompanying drawings and the present invention is described further in specific embodiment.
Embodiment 1：As Figure 1-Figure 2, a kind of DC current transformer, including conductive bar 1, conductive bar 1 are grown along it Degree direction on be provided at least three wiring holes 2,1 both ends of conductive bar are connected on DC line 3, multiple wiring holes 2 from a left side to In the right side first be connected to ammeter 4 after any wiring thereafter.
Preferably, above-mentioned conductive bar 1 uses platinum alloy or copper alloy.
Embodiment 2：A kind of current test method of DC current transformer, this method are：Set conductive bar 1 from left to right Resistance between first wiring hole 2 and the last one wiring hole 2 is R, and first wiring hole 2 and the last one wiring hole 2 are close The resistance between any wiring hole before 1 both ends of conductive bar, first wiring hole and the last one wiring hole 2 is R', conductive The maximum current of item 1 is Imax, when the electric current maximum of conductive bar, ammeter test maximum current is I'max, I'maxIt is much smaller than Imax, ImaxIt is I'maxAt least 100 times or more, I' is determined by scaling methodmaxSize, that is, the position of wiring hole is determined Set, R' correspond to one section connection the actually measured electric current for flowing through ammeter of ammeter be I', conductive bar (1) by electric current be I, therefore have：
In formula：K is no-load voltage ratio；
Had by formula (1) deformation
I in formulamaxAnd I'maxIt is known that I' is measured by ammeter, conductive bar 1 it is practical by electric current I can acquire.
Embodiment 3：The maximum current of conductive bar is 1000A, sets on corresponding conductive bar first wiring hole and second The ammeter that flows through of wiring hole measures maximum current as 5A, then no-load voltage ratio is 200, if the electric current that actual current table measures is 2.5A, Then conductive bar at this time by electric current be 1,000 5 × 2.5=500A of ÷.
Embodiment 4：The maximum current of conductive bar is 1000A, sets first wiring hole and third on corresponding conductive bar The ammeter that flows through of wiring hole measures maximum current as 10A, then no-load voltage ratio is 100, if the electric current that actual current table measures is 5A, Conductive bar at this time by electric current be 1,000 10 × 5=500A of ÷.
Embodiment 5：The maximum current of conductive bar is 1000A, sets first wiring hole and third on corresponding conductive bar The ammeter that flows through of wiring hole measures maximum current as 8A, then no-load voltage ratio is 125, if the electric current that actual current table measures is 5A, Conductive bar at this time by electric current be 1,000 8 × 5=625A of ÷.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain Within protection scope of the present invention, therefore, protection scope of the present invention should be based on the protection scope of the described claims lid.

Claims (3)

1. a kind of DC current transformer, it is characterised in that：Including conductive bar (1), conductive bar (1) is set on its length direction At least three wiring holes (2) are equipped with, conductive bar (1) both ends are connected on DC line (3), and multiple wiring holes (2) are from left to right In first be connected to ammeter (4) after any wiring thereafter.
2. a kind of DC current transformer according to claim 1, it is characterised in that：Conductive bar (1) using platinum alloy or Copper alloy.
3. according to a kind of current test method of any DC current transformers of claim 1-2, it is characterised in that：It should Method is：Resistance of the conductive bar (1) from left to right between first wiring hole (2) and the last one wiring hole (2) is set as R, The resistance between any wiring hole before one wiring hole and the last one wiring hole (2) is R', the maximum electricity of conductive bar (1) Stream is Imax, when the electric current maximum of conductive bar, ammeter test maximum current is I'max, I'maxMuch smaller than Imax, by calibration side Method determines I'maxSize, the actually measured electric current for flowing through ammeter of ammeter that R' corresponds to one section of connection are I', and conductive bar (1) is logical The electric current crossed is I, therefore is had：
In formula：K is no-load voltage ratio；
Had by formula (1) deformation
I in formulamaxAnd I'maxIt is known that I' is measured by ammeter, conductive bar (1) it is practical by electric current I can acquire.
CN201810607197.3A 2018-06-13 2018-06-13 A kind of DC current transformer and its current test method Pending CN108802476A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810607197.3A CN108802476A (en) 2018-06-13 2018-06-13 A kind of DC current transformer and its current test method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810607197.3A CN108802476A (en) 2018-06-13 2018-06-13 A kind of DC current transformer and its current test method

Publications (1)

Publication Number Publication Date
CN108802476A true CN108802476A (en) 2018-11-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810607197.3A Pending CN108802476A (en) 2018-06-13 2018-06-13 A kind of DC current transformer and its current test method

Country Status (1)

Country Link
CN (1) CN108802476A (en)

Citations (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1099804A (en) * 1964-03-06 1968-01-17 Narain Ghuriomal Hingorani Improvements in or relating to direct current transformers
CN2727748Y (en) * 2004-08-20 2005-09-21 刘岩 Accurate ammeter
JP2008014921A (en) * 2006-06-05 2008-01-24 Mayekawa Mfg Co Ltd Direct-current detecting method and dc detector
CN101210940A (en) * 2006-12-26 2008-07-02 康佳集团股份有限公司 On-line DC measuring system and method
CN101308170A (en) * 2007-05-18 2008-11-19 孙振宇 Active electric current test technology
JP2010096755A (en) * 2008-09-18 2010-04-30 Masaaki Kando Current shunt
CN201757762U (en) * 2010-06-29 2011-03-09 山西省电力公司晋城供电分公司 Circuit breaker tripping and closing voltage tester
CN102129593A (en) * 2009-12-14 2011-07-20 欧贝特科技公司 An electronic component suitable for detecting attacks by delivering energy
CN202275709U (en) * 2011-08-19 2012-06-13 杨跃龙 Secondary tapped multi-range high-precision current transformer capable of changing ratio of transformation in real time
CN202548186U (en) * 2012-03-27 2012-11-21 赛锐(青岛)自动化技术有限公司 System capable of accurately measuring voltage and current simultaneously and instrument adopting system
CN203242489U (en) * 2013-04-26 2013-10-16 广东四会互感器厂有限公司 Measuring current transformer with tap for ultra-high voltage power system
CN203825064U (en) * 2014-05-06 2014-09-10 山西兴永明仪器仪表有限责任公司 Shunt
DE102013109237A1 (en) * 2013-08-27 2015-03-05 Endress + Hauser Flowtec Ag Current output circuit, test arrangement with a current output circuit and transmitter
CN104701003A (en) * 2015-03-24 2015-06-10 山东钢铁股份有限公司 Electric connection loop of current transformer
CN104820161A (en) * 2015-05-21 2015-08-05 国家电网公司 Multi-tap current transformer secondary wiring detection device
CN104991107A (en) * 2015-07-31 2015-10-21 苏州华电电气股份有限公司 Measurement device of power grid primary current and method thereof
CN205069359U (en) * 2015-10-29 2016-03-02 中国电力科学研究院 Special high tension current transformer with simplify error measurement function
CN205666609U (en) * 2016-06-03 2016-10-26 国网浙江省电力公司舟山供电公司 A protection circuit that is used for changeablely switching transformation ratio than current transformer
CN106855584A (en) * 2016-12-09 2017-06-16 德阳市库伦电气有限公司 A kind of method that use current transformer measures electric current
US20180003741A1 (en) * 2016-06-30 2018-01-04 Keithley Instruments, Llc Nested ammeter
CN107544324A (en) * 2017-08-18 2018-01-05 河海大学常州校区 Current transformer demarcation high-current generation device and its control method
CN208443900U (en) * 2018-06-13 2019-01-29 贵州电网有限责任公司 A kind of DC current transformer

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1099804A (en) * 1964-03-06 1968-01-17 Narain Ghuriomal Hingorani Improvements in or relating to direct current transformers
CN2727748Y (en) * 2004-08-20 2005-09-21 刘岩 Accurate ammeter
JP2008014921A (en) * 2006-06-05 2008-01-24 Mayekawa Mfg Co Ltd Direct-current detecting method and dc detector
CN101210940A (en) * 2006-12-26 2008-07-02 康佳集团股份有限公司 On-line DC measuring system and method
CN101308170A (en) * 2007-05-18 2008-11-19 孙振宇 Active electric current test technology
JP2010096755A (en) * 2008-09-18 2010-04-30 Masaaki Kando Current shunt
CN102129593A (en) * 2009-12-14 2011-07-20 欧贝特科技公司 An electronic component suitable for detecting attacks by delivering energy
CN201757762U (en) * 2010-06-29 2011-03-09 山西省电力公司晋城供电分公司 Circuit breaker tripping and closing voltage tester
CN202275709U (en) * 2011-08-19 2012-06-13 杨跃龙 Secondary tapped multi-range high-precision current transformer capable of changing ratio of transformation in real time
CN202548186U (en) * 2012-03-27 2012-11-21 赛锐(青岛)自动化技术有限公司 System capable of accurately measuring voltage and current simultaneously and instrument adopting system
CN203242489U (en) * 2013-04-26 2013-10-16 广东四会互感器厂有限公司 Measuring current transformer with tap for ultra-high voltage power system
DE102013109237A1 (en) * 2013-08-27 2015-03-05 Endress + Hauser Flowtec Ag Current output circuit, test arrangement with a current output circuit and transmitter
CN203825064U (en) * 2014-05-06 2014-09-10 山西兴永明仪器仪表有限责任公司 Shunt
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CN104820161A (en) * 2015-05-21 2015-08-05 国家电网公司 Multi-tap current transformer secondary wiring detection device
CN104991107A (en) * 2015-07-31 2015-10-21 苏州华电电气股份有限公司 Measurement device of power grid primary current and method thereof
CN205069359U (en) * 2015-10-29 2016-03-02 中国电力科学研究院 Special high tension current transformer with simplify error measurement function
CN205666609U (en) * 2016-06-03 2016-10-26 国网浙江省电力公司舟山供电公司 A protection circuit that is used for changeablely switching transformation ratio than current transformer
US20180003741A1 (en) * 2016-06-30 2018-01-04 Keithley Instruments, Llc Nested ammeter
CN106855584A (en) * 2016-12-09 2017-06-16 德阳市库伦电气有限公司 A kind of method that use current transformer measures electric current
CN107544324A (en) * 2017-08-18 2018-01-05 河海大学常州校区 Current transformer demarcation high-current generation device and its control method
CN208443900U (en) * 2018-06-13 2019-01-29 贵州电网有限责任公司 A kind of DC current transformer

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Title
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