Optimal Design Method for Metering-protection-integrated Current Transformer Based on Double-core and Magnetic Field Sensors

LIU Zhaojie; ZHAO Yingying; CHEN Bochao; TIAN Cuihua; ZHANG Zhexuan

doi:10.13296/j.1001-1609.hva.2026.10.012

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Optimal Design Method for Metering-protection-integrated Current Transformer Based on Double-core and Magnetic Field Sensors

Research & Analysis | 更新时间：2026-10-14

- Optimal Design Method for Metering-protection-integrated Current Transformer Based on Double-core and Magnetic Field Sensors
- High Voltage Apparatus Vol. 62, Issue 10, Pages: 99-107(2026)
- 作者机构：
  
  国网上海市电力公司，上海 200540
  武汉大学电气与自动化学院电网环境保护全国重点实验室，武汉 430072
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2026.10.012
  CLC：
- Received：08 May 2026，
  
  Revised：2026-07-29，
  
  Published：16 October 2026
- 稿件说明：
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LIU Zhaojie, ZHAO Yingying, CHEN Bochao, et al. Optimal Design Method for Metering-protection-integrated Current Transformer Based on Double-core and Magnetic Field Sensors[J]. High Voltage Apparatus, 2026, 62(10): 99-107.
DOI：

LIU Zhaojie, ZHAO Yingying, CHEN Bochao, et al. Optimal Design Method for Metering-protection-integrated Current Transformer Based on Double-core and Magnetic Field Sensors[J]. High Voltage Apparatus, 2026, 62(10): 99-107. DOI： 10.13296/j.1001-1609.hva.2026.10.012.

摘要

基于双铁心与磁场传感器的测量保护一体化电流互感器（metering-protection-integrated current transformer，MPICT）相比于传统的电流互感器，具有较强的抗饱和能力，可同时用于测量稳态电流与短路电流，但该互感器结构参数的优化设计有待进一步研究。首先，介绍了MPICT的基本结构与工作原理，建立了MPICT的等效电路模型并归纳总结了MPICT测量误差的计算公式；其次，搭建了基于场路耦合的三维有限元仿真模型，结合测量误差计算公式分析了结构参数对MPICT稳、暂态测量特性的影响规律，进一步总结了MPICT的优化设计流程；最后，依据优化的结构参数制作了100 A/1 A MPICT样机及其后处理电路，进行了一系列稳、暂态测量特性验证实验，结果表明MPICT既可以满足测量用电流互感器0.2S准确级的精度要求，又可满足保护用电流互感器的暂态误差限值，具备在电力系统中应用的潜力。

Abstract

The metering-protection-integrated current transformer(MPICT)based on double-core and magnetic field sensor

compared to traditional current transformers

exhibits strong anti-saturation capability and

at the same time

can be used for metering both steady-state currents and short-circuit currents. However

the optimal design of the structural parameters of this current transformer requires further research. First

the basic structure and the working principle of the MPICT are introduced

the equivalent circuit model of the MPICT is established

and the calculation formula of the metering error for the MPICT is summarized. Then

a 3 D FEM simulation model is set up based on field circuti coupling

and the influence of structural parameters on the steady and transient measurement characteristics of the MPICT is analyzed in combination with the metering error calcualtion formula and the optimal design flow of the MPICT is sumarrized further. Finally

a 100 A/1 A MPICT prototype and its signal processing circuit are fabricated in accordance with the optimal strcuture parameters

and a series of stadey and transient measurement characteristic verification experiments are carried out. The experimental results indicate that the MPICT can not only meet the accuracy requirements of class 0.2S for metering current transformers

but also satisfy the transient error limits for protective current transformers

as well as possess potential for application in power grid.

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