WO2014194514A1 - Système d'étalonnage de courant ca fort basé sur le principe d'auto-étalonnage de coefficient d'induction mutuelle de bobine creuse - Google Patents

Système d'étalonnage de courant ca fort basé sur le principe d'auto-étalonnage de coefficient d'induction mutuelle de bobine creuse Download PDF

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Publication number
WO2014194514A1
WO2014194514A1 PCT/CN2013/076925 CN2013076925W WO2014194514A1 WO 2014194514 A1 WO2014194514 A1 WO 2014194514A1 CN 2013076925 W CN2013076925 W CN 2013076925W WO 2014194514 A1 WO2014194514 A1 WO 2014194514A1
Authority
WO
WIPO (PCT)
Prior art keywords
core coil
air
current
connection terminal
self
Prior art date
Application number
PCT/CN2013/076925
Other languages
English (en)
Chinese (zh)
Inventor
黄奇峰
王忠东
杨世海
陈刚
陈铭明
卢树峰
李红斌
徐敏锐
张明明
骆潘钿
范洁
周玉
Original Assignee
国家电网公司
江苏省电力公司
江苏省电力公司电力科学研究院
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 国家电网公司, 江苏省电力公司, 江苏省电力公司电力科学研究院 filed Critical 国家电网公司
Priority to PCT/CN2013/076925 priority Critical patent/WO2014194514A1/fr
Publication of WO2014194514A1 publication Critical patent/WO2014194514A1/fr

Links

Classifications

    • 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
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
    • 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
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core

Definitions

  • the invention relates to an alternating current large current verification system based on the principle of self-checking of the mutual inductance of an air-core coil, which is used for testing and verifying the performance of a current transformer under the condition of alternating current (up to several tens or even hundreds of kA). .
  • Traditional calibration equipment generally uses electromagnetic transformer-based calibration equipment, which can only verify the performance of the transformer under small current conditions. For tens of kA current, due to the saturation characteristics of the iron core, the standard transformer is accurate. The degree cannot meet the calibration requirements, and even the deviation is very large. If the core coil is to be used for calibration accuracy, the volume will be very large, which is not conducive to processing and production, and is not suitable for on-site operation.
  • the air-core coil-based current sensor has the advantages of large dynamic range, measurement frequency bandwidth, and good linearity, and is the first choice sensor for AC high current measurement.
  • the output signal of the air-core coil is small, it is greatly affected by the position of the external electromagnetic field and the current-carrying wire, so its accuracy is not high.
  • the theoretical accuracy reported at present is 0.1%, but the theoretical precision is far from being achieved.
  • Some researchers use multiple pairs of PCB-type air-core coils in series to increase the amplitude of the output signal. This form is used in the Chinese patent (authorization bulletin number: CN 1967267A), and the number of series coils depends on the magnitude of the primary current and the required accuracy.
  • a Chinese patent (authorization bulletin number: CN 2099085Y) has also studied a current transformer based on air-core coils, but the above research and patents have the following deficiencies:
  • the output of the air-core coil is a differential signal, which needs to be added to the hardware circuit in the subsequent circuit or processed in software.
  • the hardware integration circuit is subject to temperature drift and time drift, and software integration is affected by the DC component of the signal, thus introducing additional errors into the signal.
  • the iron core coil does not require a corresponding integral circuit, and its output can be directly collected after being sampled by the resistor, so the accuracy is very high.
  • the measurement accuracy of the air-core coil is greatly affected by the installation position. Therefore, when the current is checked, the measurement accuracy of the air-core coil is uncontrollable under the premise that the installation process and the result are uncontrollable, and it is difficult to ensure the current measurement of the standard current channel. Explain the accuracy of the book so that the credibility of the verification results is questioned.
  • the present invention provides an AC large current verification system based on the principle of self-checking of the coefficient of mutual inductance of an air-core coil, which can realize high-accuracy AC high current verification.
  • AC high current calibration system based on self-checking principle of air-core coil mutual inductance coefficient, including current-carrying wire, large current sensing unit with iron core coil and air-core coil as standard current sensor, bypass device for cutting iron core coil, signal a conditioning unit, a data acquisition unit, and a verification platform; an input terminal of the current carrying wire is provided with an A connection terminal, an output terminal is provided with a B connection terminal, and an electrical connection hole is disposed between the input end and the output end;
  • the core coil is sleeved on the current-carrying wire, and is located between the A connection terminal and the electrical connection hole;
  • the hollow coil is sleeved on the current-carrying wire, between the electrical connection hole and the B connection terminal, and is outside the air-core coil Covering the shield with a signal conditioning unit;
  • the bypass device includes a first bypass wire and a second bypass wire connected at one end, and the other end of the first bypass wire a C connection terminal is disposed, and the other end of the
  • the output signal of the large current sensing unit is conditioned by the signal conditioning unit, and then collected by the data acquisition unit and transmitted to the calibration platform for analysis and calculation.
  • the data acquisition unit can directly use the data acquisition card;
  • the verification platform can be a verification platform composed of a PC, and the verification platform can be based on software design; the size of the current carrying wire needs to be properly selected, and the current carrying wire Need to be placed in the core coil, air core coil and shield.
  • the dimensions (outer diameter, inner diameter, and thickness) of the air-core coil, signal conditioning unit, shield, current-carrying conductor, first/second bypass conductor, etc. can be adjusted as needed; air-core coil, signal conditioning unit, and PC
  • the software also uses its own design technology, iron core coils and data acquisition cards are commercially available.
  • the self-checking phase and the large current verifying phase of the air-core coil mutual inductance coefficient are included; in the self-checking phase of the air-core coil mutual inductance coefficient, the input signal terminal is connected with the A connection terminal and is not connected with the C connection terminal; In the inspection phase, the input signal terminal is connected to the C connection terminal, the A connection terminal is not connected, and the D connection terminal is connected to the electrical connection hole.
  • the input signal terminal is connected to the A connection terminal, and both the iron core coil and the air core coil are connected to the circuit;
  • step (2) If the judgment in step (2) is NO, the state of the air-core coil does not satisfy the condition as the calibration standard channel, and the distance between the components is readjusted, and the process returns to step (1).
  • the input signal terminal is connected to the C connection terminal, is not connected to the A connection terminal, and the D connection terminal is connected to the electrical connection hole, and the second bypass wire and the current carrying current are set.
  • the position of the wire is vertical; when the state of the air-core coil meets the requirements of the standard channel as the calibration standard, the error design and verification of the current transformer to be verified is performed by the output standard of the air-core coil.
  • the AC large current calibration system based on the self-checking principle of the air-core coil mutual inductance coefficient provided by the present invention has high accuracy and stability according to the characteristics of the iron core coil and the air-core coil, that is, the iron core coil measures small current.
  • the hollow coil has good linearity in the case of fixed installation position.
  • the core coil is used to correct the mutual inductance of the mounted air-core coil, and it is judged whether the air-coil state is satisfied.
  • the verification condition is used to judge whether the use condition of the air-core coil current sensor meets the requirements; through the feedback of the air-coil mutual inductance coefficient, the closed-loop control at the time of verification is completed, and the high-accuracy AC large current check is realized.
  • Figure 1 is a schematic view of the overall structure of the present invention
  • Figure 2 is a wiring diagram of the self-checking phase of the mutual inductance of the air-core coil
  • Figure 3 is a wiring diagram of the high current verification phase
  • the AC large current verification system based on the self-checking principle of the air-core coil mutual inductance coefficient of the present invention comprises: a current carrying wire 5, a large current transmission using a core coil 1 and an air-core coil 2 as standard current sensors.
  • the conditioning unit 3; the bypass device includes a first bypass wire 6 and a second bypass wire 7 connected at one end, and the other end of the first bypass wire 6 is provided with a C connection terminal 14, the second Bypass wire The other end of 7 is provided with a D connection terminal 11;
  • the core coil 1 is separately fixed to the current-carrying wire 5, and the air-core coil 2 and the signal conditioning unit 3 are fixed inside the shield case 4, and then integrally fixed to the current-carrying wire 5.
  • the signal conditioning unit 3 is provided with a power interface 15.
  • the core coil 1 is connected to the signal conditioning unit 3 in the shield 4 through a coaxial shield line 17; the output signals of the core coil 1 and the air-core coil 2 are both connected to the signal conditioning unit 3, and the signal conditioning unit 3 integrates the input. Processing of signal-to-noise ratio, amplitude phase, etc.; another coaxial shielding line 17 connects the signal conditioning unit 3 and the data acquisition unit 18 through the connection port 16 between the signal conditioning unit 3 and the data acquisition unit 18, and the processed data is processed.
  • the data collection unit 18 performs data acquisition; and the signal collected by the data acquisition unit 18 is transmitted to the verification platform on the PC 8 through the communication bus 19 between the data acquisition unit 18 and the PC for software analysis and calculation.
  • the large current sensing unit composed of the iron core coil 1 and the air core coil 2 is installed in the circuit to be verified, and the data collecting unit 8 directly uses the commercially available data acquisition card, and the data acquisition card and the school composed of the PC are used.
  • the inspection platform can be placed in the control room for remote control, or it can be placed in a certain position within a certain range as needed.
  • the calibration loop includes associated upflow devices and monitored transformers.
  • the large current sensing unit is composed of a core coil 1, an air core coil 2, and a shield case 4.
  • the signal conditioning unit 3 is powered directly by 220V and can also be powered by a battery.
  • the outer diameter, inner diameter, and thickness of the air-core coil 2, the signal conditioning unit 3, the shield 4, and the like can be adjusted as needed.
  • the air-core coil 2 adopts a self-designed coil based on PCB technology, and the software in the signal conditioning unit 3 and the PC also adopts a self-designed technology, and the iron core coil 1 and the data acquisition card are commercially available.
  • the current-carrying wire 5 is a metal hard wire, and the size can be made as required. The specification is as shown in Figures 2 and 3, and the specific installation method of the large current sensing unit of the present invention is explained:
  • the air-core coil 2 and the signal conditioning unit 3 are mounted inside the shield 4 and fixed, and are fixed together on the current carrying wire 5;
  • the input signal terminal 9 is connected to the A-connection terminal 10 and is not connected to the C-connection terminal 14; as shown in FIG. 3, in the high current verification phase, the input is The signal terminal 9 is connected to the C connection terminal 14, is not connected to the A connection terminal 10, and the D connection terminal 11 is connected to the electrical connection hole 12; the two stages will be described below.
  • the input signal terminal 9 is connected to the A connection terminal 10, and both the core coil 1 and the air-core coil 2 are connected to the circuit;
  • the mutual inductance of the air-core coil 2 is corrected by the output of the core coil 1 as a standard, and the result meets the error limit specified by the corresponding accuracy level.
  • the state of the air-core coil 2 satisfies the condition requirement as a calibration standard channel. If the calculated value of the mutual inductance of the air-core coil 2 differs from the calibration value by more than the specified upper limit of the threshold, it is considered that the installation does not meet the requirements, and the installation position of the sensing unit and the distance from other devices need to be adjusted, and then repeated after adjustment.
  • the large current check can be started until the state of the air-core coil 2 satisfies the condition requirement as the calibration standard channel.
  • the air core coil is used as a standard channel to verify the current transformer.
  • the input signal terminal 9 and the A connection terminal 10 are first disconnected, the input signal terminal 9 is connected to the C connection terminal 14, and the D connection terminal 11 is connected to the electrical connection hole 12, and the first setting is made.
  • the two bypass wires 7 and the current carrying wires 5 are perpendicular to each other to reduce interference with the sensing unit.
  • the iron core coil 1 is disconnected from the circuit, and the output of the air-core coil 2 that meets the requirements is installed as a reference. According to the national standard, the error calculation and verification of the verified current transformer are performed at a large current.
  • the signal terminals are connected and fixed to each other between the signal terminals and the electrical connection holes 12 by bolts for fixing the connection terminals.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transformers For Measuring Instruments (AREA)

Abstract

La présente invention porte sur un système d'étalonnage de courant CA fort basé sur le principe d'auto-étalonnage de coefficient d'induction mutuelle de bobine creuse, le système d'étalonnage de courant CA fort comprenant un fil conducteur, une unité de détection de courant fort caractérisée par une utilisation d'une bobine de noyau de fer et d'une bobine creuse en tant que capteurs de courant standard, un dispositif de dérivation pour isoler la bobine de noyau de fer en cas de courant fort, une unité de conditionnement de signal, une unité d'acquisition de données et une plate-forme d'étalonnage ; l'extrémité d'entrée du fil conducteur comporte une borne de connexion A alors que l'extrémité de sortie comporte une borne de connexion B, et un trou de connexion électrique est agencé entre l'extrémité d'entrée et l'extrémité de sortie ; la bobine de noyau de fer est manchonnée sur le fil conducteur et positionnée entre la borne de connexion A et le trou de connexion électrique ; la bobine creuse est manchonnée sur le fil conducteur et positionnée entre le trou de connexion électrique et la borne de connexion B, le côté extérieur de la bobine creuse est recouvert d'un blindage, et simultanément, l'unité de conditionnement de signal est également positionnée à l'intérieur du blindage. Le système est apte à réaliser un étalonnage de courant CA fort avec une précision élevée.
PCT/CN2013/076925 2013-06-07 2013-06-07 Système d'étalonnage de courant ca fort basé sur le principe d'auto-étalonnage de coefficient d'induction mutuelle de bobine creuse WO2014194514A1 (fr)

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PCT/CN2013/076925 WO2014194514A1 (fr) 2013-06-07 2013-06-07 Système d'étalonnage de courant ca fort basé sur le principe d'auto-étalonnage de coefficient d'induction mutuelle de bobine creuse

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PCT/CN2013/076925 WO2014194514A1 (fr) 2013-06-07 2013-06-07 Système d'étalonnage de courant ca fort basé sur le principe d'auto-étalonnage de coefficient d'induction mutuelle de bobine creuse

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107765208A (zh) * 2017-10-17 2018-03-06 天津市百利纽泰克电气科技有限公司 基于母线定位装置的零序电流互感器线圈试验方法
CN108845284A (zh) * 2018-09-18 2018-11-20 国网四川省电力公司电力科学研究院 一种三相组合式标准互感器

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WO2006019738A2 (fr) * 2004-07-15 2006-02-23 Cooper Technologies Company Onde progressive fondee sur la protection des relais
CN102313879A (zh) * 2011-09-19 2012-01-11 贵州电力试验研究院 基于双钳型电流线圈的电子式电流互感器在线校验系统
CN102401889A (zh) * 2011-11-08 2012-04-04 国网电力科学研究院 一种高压电流互感器在线校验方法
CN102608557A (zh) * 2012-03-19 2012-07-25 西安交通大学 一种具有在线校验功能的光电电流互感器
CN103197274A (zh) * 2013-03-13 2013-07-10 江苏省电力公司电力科学研究院 电流互感器的交流大电流校验系统及方法
CN203117414U (zh) * 2013-03-13 2013-08-07 江苏省电力公司电力科学研究院 电流互感器的交流大电流校验系统

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006019738A2 (fr) * 2004-07-15 2006-02-23 Cooper Technologies Company Onde progressive fondee sur la protection des relais
CN102313879A (zh) * 2011-09-19 2012-01-11 贵州电力试验研究院 基于双钳型电流线圈的电子式电流互感器在线校验系统
CN102401889A (zh) * 2011-11-08 2012-04-04 国网电力科学研究院 一种高压电流互感器在线校验方法
CN102608557A (zh) * 2012-03-19 2012-07-25 西安交通大学 一种具有在线校验功能的光电电流互感器
CN103197274A (zh) * 2013-03-13 2013-07-10 江苏省电力公司电力科学研究院 电流互感器的交流大电流校验系统及方法
CN203117414U (zh) * 2013-03-13 2013-08-07 江苏省电力公司电力科学研究院 电流互感器的交流大电流校验系统

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107765208A (zh) * 2017-10-17 2018-03-06 天津市百利纽泰克电气科技有限公司 基于母线定位装置的零序电流互感器线圈试验方法
CN108845284A (zh) * 2018-09-18 2018-11-20 国网四川省电力公司电力科学研究院 一种三相组合式标准互感器

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