CN102520382A - Method for detecting half-wave current transformation error of current transformer - Google Patents

Method for detecting half-wave current transformation error of current transformer Download PDF

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Publication number
CN102520382A
CN102520382A CN2012100073874A CN201210007387A CN102520382A CN 102520382 A CN102520382 A CN 102520382A CN 2012100073874 A CN2012100073874 A CN 2012100073874A CN 201210007387 A CN201210007387 A CN 201210007387A CN 102520382 A CN102520382 A CN 102520382A
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China
Prior art keywords
current
current transformer
wave
transformer
error
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Pending
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CN2012100073874A
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Chinese (zh)
Inventor
靳绍平
张春强
赵震宇
李东江
张翠琴
宁涛
刘见
李水仙
熊敏南
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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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Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
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Priority to CN2012100073874A priority Critical patent/CN102520382A/en
Publication of CN102520382A publication Critical patent/CN102520382A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a method for detecting a half-wave current transformation error of a current transformer. The method is characterized in that based on a detecting circuit of the traditional current transformer, two diodes, namely a positive diode and a negative diode, with a forward on circuit greater than a rated current of the current transformer are respectively serially connected with two sample current transformers to form a positive half-wave current transformation and a negative half-wave current transformation, the two half-wave current transformers which are symmetric are serially connected to form a full-wave current transformer for measuring the error, and the measured error is the error of the half-wave current transformers. According to the method for detecting the half-wave current transformation error of the current transformer, the transformation error of the current transformer under a half-wave current can be detected by utilizing traditional current transformer verification devices such as an alternating current booster, a standard current transformer, a mutual inductor calibrator, a load box and the like. The method has the advantages of simpleness, low cost, scientificalness, practicability, high maneuverability, low cost and the like, and is suitable for the technical field of measurement accuracy of a direct-current resisting component of the current transformer.

Description

Current transformer half-wave current mapping fault detection method
 
Technical field
The present invention relates to a kind of current transformer in half-wave current down conversion error detecting methods, belong to electric-power metering current transformer detection technique field.
Background technology
The different model that different manufacturers is produced and the current transformer of different batches, the magnetic property of iron core is all incomplete same, and remanent magnetism is also inequality to the influence of current transformer error.It possibly be that DC component is arranged in the primary current that a kind of of strong remanent magnetism appears in operating current transformer, makes the iron core magnetic saturation, causes the equivalent magnetoconductivity of iron core to reduce, and error will be significantly to negative reverse moving.DC component can be studied in the mapping fault under the half-wave current through current transformer the influence of current transformer error.The checkout equipment that is used at present current transformer both at home and abroad is the interchange full-wave type; The calibrating wiring diagram of the conventional voltage transformer (VT) calibrating wiring diagram of JJG1021-2007 " current transformer vertification regulation " regulation is as shown in Figure 1, but it can't detect in the mapping fault under the half-wave current current transformer.
Detect in order to solve the mapping fault of current transformer under half-wave current, study a kind of current transformer in half-wave current down conversion error detecting methods to changing above-mentioned situation, significant.
Summary of the invention
The objective of the invention is; Be the interchange full-wave type in order to solve the checkout equipment that is used for current transformer at present both at home and abroad; The problem that can't detect in the mapping fault under the half-wave current current transformer; How to utilize existing equipment to detect current transformer, the invention provides a kind of current transformer in half-wave current down conversion error detecting methods in half-wave current down conversion error.
Technical scheme of the present invention is; On the basis of existing current transformer calibrating circuit, use the diode of 2 forward conduction electric currents greater than the current transformer rated current, one positive one instead connects with two bench teat article current transformers respectively; Form a positive half-wave current transformer and a negative half-wave current mutual inductor; Half-wave current mutual inductor parallel connection with two symmetries is combined into the full-wave electric current mutual inductor and carries out error measure, records the error that error is the half-wave current mutual inductor.
Current transformer has at the major equipment that half-wave current down conversion error detecting methods adopts: the accurate current transformer of a station symbol (0.02 grade), a mutual-inductor tester (2 grades), a current capacity case (3 grades), 2 forward conduction electric currents are greater than the diode of current transformer rated current.
Current transformer is as shown in the figure in the wiring of the detection of half-wave current down conversion error, and promptly two are tried current transformer CT X1, CT X2Secondary coil parallel connection, the difference testing current end K of a termination mutual-inductor tester, an end meet the working current test lead T of mutual-inductor tester through current capacity case Z X2 forward conduction electric currents are greater than the diode D of current transformer rated current 1, D 2, one positive one instead connects D with two bench teat article current transformers respectively 2Positive pole connects by examination current transformer CT X2Secondary coil one end, D 2Negative pole connects current lifting device one end; D 1Negative pole connects by examination current transformer CT X1Secondary coil one end, D 1Positive pole and D 2And ally the communists and connect current lifting device; Standard mutual inductor CT 0Primary winding one termination current lifting device, the other end and two are linked by examination current transformer primary winding parallel connected end; Standard mutual inductor CT 0The working current test lead T of secondary coil one termination mutual-inductor tester 0, the other end and two parallel connected end by examination Current Transformer Secondary coil link; Mutual-inductor tester another difference testing current end D ground connection.
Requirement by the relevant rules of current transformer detects, and the steps include:
(1) limited load in the selection;
(2) by rules requirement up-flow, respectively in the upper limit load error of 1%, 5%, 20%, 100%, 120% measuring current mutual inductor of rated current;
(3) electric current is reduced to 0;
(4) select limited load down;
(5) by rules requirement up-flow, respectively in the lower limit load error of 1%, 5%, 20%, 100% measuring current mutual inductor of rated current;
(6) electric current is reduced to 0;
(7) accomplish the calibrating of this current transformer.
The invention has the beneficial effects as follows; Detect current transformer when half-wave current down conversion error; Use 2 forward conduction electric currents instead to connect with 2 bench teat article current transformers respectively greater than the diode one positive of current transformer rated current; Form a positive half-wave current transformer and a negative half-wave current mutual inductor; Constitute the detection line of current transformer, utilize current transformer calibration equipments such as existing interchange current lifting device, standard current transformer, mutual-inductor tester, Burden box, can realize the detection of current transformer in half-wave current down conversion error in half-wave current down conversion error.Have that method is succinct, economy, science, practicality, workable, low cost and other advantages.
The present invention is applicable to the anti-DC component metering accuracy of current transformer field of measuring technique.
Description of drawings
Fig. 1 is that the conventional current mutual inductor detects wiring diagram;
Fig. 2 is that the half-wave current transformer error detects wiring diagram;
Symbol among the figure: CT 0It is standard current transformer; CT xIt is the test specimen current transformer; CT X1It is #1 test specimen current transformer; CT X2It is #2 test specimen current transformer; Z is the current transformer Burden box; D 1It is the #1 diode; D 2It is the #2 diode; T 0, T XIt is mutual-inductor tester working current test lead; K, D are mutual-inductor tester difference testing current ends.
Embodiment
Below in conjunction with accompanying drawing the present invention is elaborated.
The first step: setup test equipment
The accurate current transformer of one station symbol (0.02 grade), a mutual-inductor tester (2 grades), a current capacity case (3 grades), 2 forward conduction electric currents are greater than the diode of current transformer rated current, two tested current transformers.
Second step: carry out wiring by Fig. 2 mode of connection;
Tried current transformer CT with two X1, CT X2Secondary coil parallel connection, the difference testing current end K of a termination mutual-inductor tester, an end meet the working current test lead T of mutual-inductor tester through current capacity case Z X2 forward conduction electric currents are greater than the diode D of current transformer rated current 1, D 2, one positive one instead connects D with two bench teat article current transformers respectively 2Positive pole connects by examination current transformer CT X2Secondary coil one end, D 2Negative pole connects current lifting device one end; D 1Negative pole connects by examination current transformer CT X1Secondary coil one end, D 1Positive pole and D 2And ally the communists and connect current lifting device; Standard mutual inductor CT 0Primary winding one termination current lifting device, the other end and two are linked by examination current transformer primary winding parallel connected end; Standard mutual inductor CT 0The working current test lead T of secondary coil one termination mutual-inductor tester 0, the other end and two parallel connected end by examination Current Transformer Secondary coil link; Mutual-inductor tester another difference testing current end D ground connection.
The 3rd step: the requirement by JJG1021-2007 " current transformer vertification regulation " is examined and determine trying current transformer;
(1) limited load in the selection;
(2) by rules requirement up-flow, respectively in the upper limit load error of 1%, 5%, 20%, 100%, 120% measuring current mutual inductor of rated current;
(3) electric current is reduced to 0;
(4) select limited load down;
(5) by rules requirement up-flow, respectively in the lower limit load error of 1%, 5%, 20%, 100% measuring current mutual inductor of rated current;
(6) electric current is reduced to 0;
(7) accomplish the calibrating of this current transformer.

Claims (2)

1. a current transformer is in half-wave current down conversion error detecting methods; It is characterized in that; Said method is used the diode of 2 forward conduction electric currents greater than the current transformer rated current on the basis of existing current transformer calibrating circuit, one positive one instead connects with two bench teat article current transformers respectively; Form a positive half-wave current transformer and a negative half-wave current mutual inductor; Half-wave current mutual inductor parallel connection with two symmetries is combined into the full-wave electric current mutual inductor and carries out error measure, records the error that error is the half-wave current mutual inductor.
2. current transformer according to claim 1 is characterized in that in half-wave current down conversion error detecting methods said calibrating circuit is tried current transformer CT with two X1, CT X2Secondary coil parallel connection, the difference testing current end K of a termination mutual-inductor tester, an end meet the working current test lead T of mutual-inductor tester through current capacity case Z X2 forward conduction electric currents are greater than the diode D of current transformer rated current 1, D 2, one positive one instead connects D with two bench teat article current transformers respectively 2Positive pole connects by examination current transformer CT X2Secondary coil one end, D 2Negative pole connects current lifting device one end; D 1Negative pole connects by examination current transformer CT X1Secondary coil one end, D 1Positive pole and D 2And ally the communists and connect current lifting device; Standard mutual inductor CT 0Primary winding one termination current lifting device, the other end and two are linked by examination current transformer primary winding parallel connected end; Standard mutual inductor CT 0The working current test lead T of secondary coil one termination mutual-inductor tester 0, the other end and two parallel connected end by examination Current Transformer Secondary coil link; Mutual-inductor tester another difference testing current end D ground connection.
CN2012100073874A 2012-01-12 2012-01-12 Method for detecting half-wave current transformation error of current transformer Pending CN102520382A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102928802A (en) * 2012-10-16 2013-02-13 江西省电力科学研究院 Method for detecting alternating current-direct current standard-based direct current resistance performance of current transformer
CN103207379A (en) * 2013-03-22 2013-07-17 中国电力科学研究院 Method and device for measuring direct current magnetic bias error characteristics of current transformer
WO2017045488A1 (en) * 2015-09-16 2017-03-23 中国电力科学研究院 Test system for anti-dc component and even-order harmonic of current transformer
CN110703176A (en) * 2019-11-29 2020-01-17 江苏方天电力技术有限公司 Current transformer error testing system and method under limit temperature
CN113030835A (en) * 2021-02-05 2021-06-25 宁波三星医疗电气股份有限公司 Electric energy meter metering method
CN116930849A (en) * 2023-07-18 2023-10-24 浙江天际互感器股份有限公司 Anti-direct-current transformer half-wave error detection system and method based on fundamental wave comparison method

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CN201293832Y (en) * 2008-11-11 2009-08-19 河南平高电气股份有限公司 Test device for multifunctional current transformer
CN101539616A (en) * 2008-03-20 2009-09-23 上海市电力公司 Method for detecting accuracy of optical current transformer for measuring
CN101639524A (en) * 2009-05-14 2010-02-03 山西省机电设计研究院 Current mutual inductor field detecting device for protection

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CN101539616A (en) * 2008-03-20 2009-09-23 上海市电力公司 Method for detecting accuracy of optical current transformer for measuring
CN201293832Y (en) * 2008-11-11 2009-08-19 河南平高电气股份有限公司 Test device for multifunctional current transformer
CN101639524A (en) * 2009-05-14 2010-02-03 山西省机电设计研究院 Current mutual inductor field detecting device for protection

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102928802A (en) * 2012-10-16 2013-02-13 江西省电力科学研究院 Method for detecting alternating current-direct current standard-based direct current resistance performance of current transformer
CN102928802B (en) * 2012-10-16 2015-02-18 江西省电力科学研究院 Method for detecting alternating current-direct current standard-based direct current resistance performance of current transformer
CN103207379A (en) * 2013-03-22 2013-07-17 中国电力科学研究院 Method and device for measuring direct current magnetic bias error characteristics of current transformer
CN103207379B (en) * 2013-03-22 2015-05-20 中国电力科学研究院 Method and device for measuring direct current magnetic bias error characteristics of current transformer
GB2556610A (en) * 2015-09-16 2018-05-30 China Electric Power Res Institute Company Limited Test system for anti-DC component and even-order harmonic of current transformer
CN106546938A (en) * 2015-09-16 2017-03-29 中国电力科学研究院 A kind of anti-DC component of current transformer and test even system
WO2017045488A1 (en) * 2015-09-16 2017-03-23 中国电力科学研究院 Test system for anti-dc component and even-order harmonic of current transformer
DE112016004201B4 (en) * 2015-09-16 2021-02-11 China Electric Power Research Institute Company Limited Test system for the resistance of a current transformer to direct current components and even harmonics
GB2556610B (en) * 2015-09-16 2021-07-07 China Electric Power Res Institute Company Limited Test system for anti-DC component and even-order harmonic of current transformer
CN110703176A (en) * 2019-11-29 2020-01-17 江苏方天电力技术有限公司 Current transformer error testing system and method under limit temperature
CN113030835A (en) * 2021-02-05 2021-06-25 宁波三星医疗电气股份有限公司 Electric energy meter metering method
CN113030835B (en) * 2021-02-05 2022-04-26 宁波三星医疗电气股份有限公司 Electric energy meter metering method
CN116930849A (en) * 2023-07-18 2023-10-24 浙江天际互感器股份有限公司 Anti-direct-current transformer half-wave error detection system and method based on fundamental wave comparison method
CN116930849B (en) * 2023-07-18 2024-05-14 浙江天际互感器股份有限公司 Anti-direct-current transformer half-wave error detection system and method based on fundamental wave comparison method

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Address after: 330009 No. 88 min Qiang Road, private science and Technology Park, Jiangxi, Nanchang

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Application publication date: 20120627