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WO2014008707A1 - Ratio error self calibration system for miniature current transformer - Google Patents

Ratio error self calibration system for miniature current transformer Download PDF

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Publication number
WO2014008707A1
WO2014008707A1 PCT/CN2012/081267 CN2012081267W WO2014008707A1 WO 2014008707 A1 WO2014008707 A1 WO 2014008707A1 CN 2012081267 W CN2012081267 W CN 2012081267W WO 2014008707 A1 WO2014008707 A1 WO 2014008707A1
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WO
WIPO (PCT)
Prior art keywords
current
ratio
miniature
micro
current transformer
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PCT/CN2012/081267
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French (fr)
Chinese (zh)
Inventor
王乐仁
金波
何斌
Original Assignee
天门市电工仪器仪表研究所
湖北天瑞电子有限公司
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Application filed by 天门市电工仪器仪表研究所, 湖北天瑞电子有限公司 filed Critical 天门市电工仪器仪表研究所
Priority to DE112012001418.9T priority Critical patent/DE112012001418T8/en
Publication of WO2014008707A1 publication Critical patent/WO2014008707A1/en

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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

Definitions

  • the invention relates to a current transformer, in particular to a miniature current transformer, and belongs to the technical field of electrical measurement. ⁇ Background technique ⁇
  • the miniature current transformer refers to the power frequency current transformer used by the mechanical industry standard JB/T10665 "Micro Current Transformer” for primary current not exceeding 10A, secondary current lmA ⁇ 100mA, for electronic energy meter and other instruments.
  • the error of the miniature current transformer is verified according to the national metrological verification procedure JJG313 "Measurement Current Transformer” using the difference method.
  • the difference method requires the use of a standard current transformer or current comparator of the same current ratio. At present, the value standard of the miniature current transformer has not been established in China.
  • the error of the micro current transformer is checked by the voltage difference method.
  • the standard current transformer secondary circuit with current 0.5A ⁇ 5A is connected to the shunt to obtain the reference voltage, which is compared with the measured voltage obtained by connecting the load resistance of the secondary circuit of the measured micro current transformer.
  • the object of the invention is to derive the micro-current proportional standard quantity according to the metrological definition by the self-calibration and range expansion operation of the micro-inductive shunt and the micro-current comparator, for the error verification of the micro-current transformer, and to implement the micro-current mutual inductance.
  • Technical support is provided by the industry standard.
  • a micro current transformer ratio error self-calibration system which is composed of a 10-segment single-disc micro-inductive shunt, a 5A/0.5A micro-current comparator, three multi-ratio micro-current comparators, and a current-sense mutual inductance.
  • the tester, the test current source, the error measuring device, the zero-impedance box, and the galvanometer together form a self-calibration system, and the reference current method is used to derive the ratio of the 10-segment single-disc micro-inductive shunt and the 5A/0.5A micro-current comparator.
  • FIG. 1 is a schematic diagram of a self-calibrating circuit of a miniature induction shunt used in the present invention.
  • Fig. 2 is a schematic diagram showing the circuit of the extended ratio range of the miniature current comparator cascading micro-inductive shunt used in the present invention.
  • Fig. 3 is a schematic diagram showing the circuit of the miniature current transformer used in the multi-ratio micro current comparator of the present invention.
  • Test current source 2. 10-segment single-disc micro-inductive shunt, 3. 5A/0.5A micro-current comparator, 4. Error measuring device, 5. Multi-ratio micro-current comparator, 6. Power supply Current transformer, 7. Zero impedance box, 8. Power frequency galvanometer, 9. Miniature current transformer, 10. Secondary load resistance.
  • the miniature current comparator 3 acts as a reference current transformer with a current ratio of 5A/0.5A and a ratio of 10/1.
  • the inductive shunt 2 has a total of 10 segments, and the current taps are set to n-1 and n.
  • ⁇ ⁇ is the nth segment shunt error, which is the reference current transformer error.
  • the secondary output of the miniature current comparator 3 is connected to the first section of the micro-inductive shunt via the supply current transformer 6 to form a cascaded line, and the current ratio after the cascade is equal to 5 ⁇ /0.05 ⁇ .
  • the multi-variable ratio micro current comparator 5 sets the current ratio to 5 ⁇ /0.05 ⁇ , which is in the state of being tested.
  • the error obtained by adding the error values ⁇ s and ⁇ k of 3 and 2 to the measurement result obtained by the error measuring device 4 is an error of 5. As long as the segmentation mode of 2 is changed, other currents such as 5A/0.02A, 5A/0. 01A, etc. can be obtained.
  • the miniature current transformer 9 is in an calibrated state, and its secondary circuit is connected to a predetermined load resistor 10 according to product technical conditions.
  • the variable ratio micro current comparator 5 serves as a standard gauge, the test current source 1 supplies a prescribed primary current, and finally the error is measured by the error measuring device 4.
  • Micro current error comparator in the order of 10-5 or less, a micro test current transformer is generally not necessary to correct errors introduced by the comparator.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

A ratio error self calibration system for a miniature current transformer comprises a 10-segment single disc miniature sensing diverter, a 5A/0.5A miniature current comparator, three multi-ratio miniature current comparators, a power supply current transformer, a test current source, an error measurement apparatus, a zeroing impedance casing and a galvanometer, wherein 5A/0.5A to 0.001A ratio values are led out employing a reference current method self calibration line and a current comparator cascade single-disc induction diverter ratio expansion line. The ratio error self calibration system for a miniature current transformer is characterized in that the current ratio measuring ranges are divided into three segments as following: 5A/0.5 A to 0.1A, 5A/0.05A to 0.01A and 5A/0.005A to 0.001A, which are covered respectively by three multi-ratio miniature current comparators. The advantages are provided as following: the number of self calibration operation steps is small, the measuring range expansion efficiency is high, and value reproducibility is good.

Description

微型电流互感器比率误差自校准系统  Micro current transformer ratio error self-calibration system
【技术领域】 [Technical Field]
本发明涉及电流互感器， 尤其是微型电流互感器， 属于电测量技术领域。 【背景技术】  The invention relates to a current transformer, in particular to a miniature current transformer, and belongs to the technical field of electrical measurement. 【Background technique】
微型电流互感器是指机械行业标准 JB/T10665《微型电流互感器》界定的 一次电流不超过 10A, 二次电流 lmA〜100mA， 供电子式电能表及其它仪器 仪表使用的工频电流互感器。 微型电流互感器的误差按照国家计量检定规程 JJG313 《测量用电流互感器》， 使用差值法检定。 差值法需要使用相同电流比 的标准电流互感器或电流比较仪，目前国内还没有建立微型电流互感器的量值 标准， 检验微型电流互感器误差使用的是电压差值方法， 在额定二次电流 0.5A〜5A的标准电流互感器二次回路接入分流器得到参考电压， 与接入被测 微型电流互感器二次回路的负荷电阻上得到的被测电压进行比较。使用非标准 方法导致了误差量值的不统一， 影响了标准的实施。  The miniature current transformer refers to the power frequency current transformer used by the mechanical industry standard JB/T10665 "Micro Current Transformer" for primary current not exceeding 10A, secondary current lmA~100mA, for electronic energy meter and other instruments. The error of the miniature current transformer is verified according to the national metrological verification procedure JJG313 "Measurement Current Transformer" using the difference method. The difference method requires the use of a standard current transformer or current comparator of the same current ratio. At present, the value standard of the miniature current transformer has not been established in China. The error of the micro current transformer is checked by the voltage difference method. The standard current transformer secondary circuit with current 0.5A~5A is connected to the shunt to obtain the reference voltage, which is compared with the measured voltage obtained by connecting the load resistance of the secondary circuit of the measured micro current transformer. The use of non-standard methods leads to inconsistencies in the magnitude of the error, affecting the implementation of the standard.
【发明内容】 [Summary of the Invention]
本发明的目的是通过微型感应分流器和微型电流比较仪的自校准和量程 扩展操作，按计量学定义导出微电流比例标准量值，用于微型电流互感器的误 差检定， 为贯彻微型电流互感器行业标准提供技术支持。  The object of the invention is to derive the micro-current proportional standard quantity according to the metrological definition by the self-calibration and range expansion operation of the micro-inductive shunt and the micro-current comparator, for the error verification of the micro-current transformer, and to implement the micro-current mutual inductance. Technical support is provided by the industry standard.
本发明解决其技术问题所采用的技术方案是这样实现的：  The technical solution adopted by the present invention to solve the technical problem is achieved as follows:
提供一种微型电流互感器比率误差自校准系统， 它由一台 10段单盘微型 感应分流器、 一台 5A/0.5A微型电流比较仪、三台多变比微型电流比较仪、供 电电流互感器、 试验电流源、 误差测量装置、 调零阻抗箱、 检流计共同组成自 校准系统， 采用参考电流法导出 10段单盘微型感应分流器和 5A/0.5A微型电 流比较仪的比率量值， 再使用 5A/0.5A微型电流比较仪级联 10段单盘微型感 应分流器组成比率量程扩展线路，并把导出的扩展比率量值传递到下一台多变 比微型电流比较仪， 继续使用这台多变比微型电流比较仪和 10段单盘微型感 应分流器级联， 导出需要使用的电流比率量值，传递到另一台多变比微型电流 比较仪， 依此类推， 直到获得全部需要的电流比率量值； 其特征在于， 电流比 率量程分为 5A/0.5A〜0.1A、 5A/0.05A〜0.01A、 5A/0.005A〜0.001A三段， 用 三台多变比微型电流比较仪分段覆盖。 【附图说明】 A micro current transformer ratio error self-calibration system is provided, which is composed of a 10-segment single-disc micro-inductive shunt, a 5A/0.5A micro-current comparator, three multi-ratio micro-current comparators, and a current-sense mutual inductance. The tester, the test current source, the error measuring device, the zero-impedance box, and the galvanometer together form a self-calibration system, and the reference current method is used to derive the ratio of the 10-segment single-disc micro-inductive shunt and the 5A/0.5A micro-current comparator. Then, use the 5A/0.5A micro current comparator to cascade the 10-segment single-disc micro-inductive shunt to form the ratio range extension line, and pass the derived extended ratio value to the next multi-ratio micro current comparator to continue using This multi-variable micro current comparator is cascaded with a 10-segment single-disc micro-inductive shunt to derive the current ratio value to be used, passed to another multi-ratio micro-current comparator, and so on, until all The required current ratio magnitude; characterized in that the current ratio range is divided into three segments of 5A/0.5A~0.1A, 5A/0.05A~0.01A, 5A/0.005A~0.001A, and three multi-variable ratio micrometers. The current comparator is covered in sections. [Description of the Drawings]
图 1是本发明采用的微型感应分流器自校准线路示意图。  1 is a schematic diagram of a self-calibrating circuit of a miniature induction shunt used in the present invention.
图 2 是本发明采用的微型电流比较仪级联微型感应分流器扩展比率量程 的线路示意图。  Fig. 2 is a schematic diagram showing the circuit of the extended ratio range of the miniature current comparator cascading micro-inductive shunt used in the present invention.
图 3 是本发明采用的多变比微型电流比较仪检定微型电流互感器的线路 示意图。  Fig. 3 is a schematic diagram showing the circuit of the miniature current transformer used in the multi-ratio micro current comparator of the present invention.
图中： 1. 试验电流源， 2. 10段单盘微型感应分流器， 3. 5A/0.5A微型 电流比较仪， 4. 误差测量装置， 5. 多变比微型电流比较仪， 6. 供电电流 互感器， 7.调零阻抗箱， 8.工频检流计， 9. 微型电流互感器， 10. 二次负 荷电阻。  In the figure: 1. Test current source, 2. 10-segment single-disc micro-inductive shunt, 3. 5A/0.5A micro-current comparator, 4. Error measuring device, 5. Multi-ratio micro-current comparator, 6. Power supply Current transformer, 7. Zero impedance box, 8. Power frequency galvanometer, 9. Miniature current transformer, 10. Secondary load resistance.
【具体实施方式】 下面， 结合附图 1至附图 3对本发明作进一步描述。 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be further described with reference to FIGS. 1 to 3.
图 1中， 微型电流比较仪 3作为参考电流互感器， 电流比 5A/0.5A, 变比 10/1； 感应分流器 2共有 10段， 置一次电流抽头为 n— 1和 n。 记 ε η为第 η段 分流误差， 为参考电流互感器误差， 为测量值， 则有： 进行了 10段测量后， 把各段误差相加：  In Figure 1, the miniature current comparator 3 acts as a reference current transformer with a current ratio of 5A/0.5A and a ratio of 10/1. The inductive shunt 2 has a total of 10 segments, and the current taps are set to n-1 and n. Note that ε η is the nth segment shunt error, which is the reference current transformer error. For the measured value, there are: After 10 measurements, add the error of each segment:
10 10  10 10
X^ = X^n - io^s = -io^s X^ = X^ n - io^ s = -io^ s
i=l n=l l 10 据此可计算出感应分流器 2 置比率 10/K 的误差 ε k和微型电流比较仪 3 的i=ln=ll 10 According to this, the error ε k of the inductive shunt 2 setting ratio 10/K and the micro current comparator 3 can be calculated.
5A/0.5A量程的误差 ε s : 5A/0.5A range error ε s :
1 κ i κ i Ν  1 κ i κ i Ν
1 10 图 2中， 微型电流比较仪 3的二次输出经过供电电流互感器 6与微型感 应分流器的第一段连接， 组成级联线路， 级联后的电流比等于 5Α/0.05Α。 多 变比微型电流比较仪 5置电流比 5Α/0.05Α, 处于受检定状态。 把误差测量装 置 4得到的测量结果加上 3和 2的误差值 ε s和 ε k就是 5的误差。只要改变 2 的分段方式， 就可以得到其它电流比如 5A/0.02A, 5A/0. 01A等。 如果在图 2 线路中把 3更换为具有 5A/0.05A的下一台多变比微型电流比较仪， 继续与 2 级联， 就可以得到 5A/0.005A, 5A/0.002A, 5A/0. 001A等电流比量值， 然后再 传递给另一台多变比微型电流比较仪。由于微型电流比较仪 3工作在零磁通状 态， 不能输出二次电流， 其二次回路电流需要供电电流互感器 6产生， 当调节 调零阻抗箱 7使检流计 8指零时， 3到达零磁通状态。 用以上步骤可以分别导 出微型电流互感器需要使用的各种电流比的标准量值。 1 10 In Fig. 2, the secondary output of the miniature current comparator 3 is connected to the first section of the micro-inductive shunt via the supply current transformer 6 to form a cascaded line, and the current ratio after the cascade is equal to 5Α/0.05Α. The multi-variable ratio micro current comparator 5 sets the current ratio to 5Α/0.05Α, which is in the state of being tested. The error obtained by adding the error values ε s and ε k of 3 and 2 to the measurement result obtained by the error measuring device 4 is an error of 5. As long as the segmentation mode of 2 is changed, other currents such as 5A/0.02A, 5A/0. 01A, etc. can be obtained. If in Figure 2 In the line, replace 3 with the next multi-ratio micro current comparator with 5A/0.05A. Continue to connect with 2 to get 5A/0.005A, 5A/0.002A, 5A/0. 001A and other current ratios. The magnitude is then passed to another multi-variable micro current comparator. Since the micro current comparator 3 operates in the zero flux state, the secondary current cannot be output, and the secondary loop current needs to be generated by the supply current transformer 6. When the zeroing impedance box 7 is adjusted to cause the galvanometer 8 to be zero, 3 arrives. Zero flux state. The above steps can be used to derive the standard values of the various current ratios that the miniature current transformer needs to use.
图 3中，微型电流互感器 9处于被检定状态，它的二次回路按产品技术条 件接入规定的负荷电阻 10。 多变比微型电流比较仪 5作为标准量具， 试验电 流源 1提供规定的一次电流，最后由误差测量装置 4测量出误差。微型电流比 较仪的误差在 10— 5量级以下，检定微型电流互感器一般不需要修正比较仪引入 的误差。 In Fig. 3, the miniature current transformer 9 is in an calibrated state, and its secondary circuit is connected to a predetermined load resistor 10 according to product technical conditions. The variable ratio micro current comparator 5 serves as a standard gauge, the test current source 1 supplies a prescribed primary current, and finally the error is measured by the error measuring device 4. Micro current error comparator in the order of 10-5 or less, a micro test current transformer is generally not necessary to correct errors introduced by the comparator.
上文虽然已示出了本发明的详尽实施例，本领域的技术人员在不违背本发明 的前提下， 可进行部分修改和变更； 上文的描述和附图中提及的内容仅作为说明 性的例证， 并非对本发明的限制， 具有上述技术特征的微型电流互感器比率误 差自校准系统均落入本专利保护范围。  The detailed description of the present invention has been shown in the above, and those skilled in the art can make some modifications and changes without departing from the invention; The illustration of the nature is not a limitation of the present invention, and the micro current transformer ratio error self-calibration system having the above technical features falls within the scope of this patent.

Claims

权利要求 Rights request
1、一种微型电流互感器比率误差自校准系统， 它由一台 10段单盘微型感应分 流器、 一台 5A/0.5A微型电流比较仪、三台多变比微型电流比较仪、供电电流 互感器、 试验电流源、 误差测量装置、 调零阻抗箱、 检流计共同组成自校准系 统，采用参考电流法自校线路和电流比较仪级联单盘感应分流器比率扩展线路 导出 5A/0.5A〜0.001A 比率量值； 其特征在于， 所述电流比率量程分为 5A/0.5A〜0.1A、 5A/0.05A〜0.01A、 5A/0.005A〜0.001A三段， 并用三台多变 比微型电流比较仪分段覆盖。 1. A miniature current transformer ratio error self-calibration system consisting of a 10-segment single-disc micro-inductive shunt, a 5A/0.5A micro-current comparator, three multi-ratio micro-current comparators, and supply current Transformer, test current source, error measuring device, zero-impedance box, galvanometer together form a self-calibration system, using reference current method self-calibration line and current comparator cascading single-disk induction shunt ratio expansion line to export 5A/0.5 A~0.001A ratio magnitude; characterized in that the current ratio range is divided into three segments of 5A/0.5A~0.1A, 5A/0.05A~0.01A, 5A/0.005A~0.001A, and three sets are used. Segment coverage over the micro current comparator.
PCT/CN2012/081267 2012-07-13 2012-09-12 Ratio error self calibration system for miniature current transformer WO2014008707A1 (en)

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DE112012001418.9T DE112012001418T8 (en) 2012-07-13 2012-09-12 System for self-calibration of a translation error for miniature current transformers

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CN201210241728.4A CN103543428B (en) 2012-07-13 2012-07-13 Miniature current transformer ratio error self-calibration system

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