南方电网技术2024，Vol.18Issue(11)：150-158,9.DOI:10.13648/j.cnki.issn1674-0629.2024.11.016
基于零磁通原理的宽量程电流互感器传变特性
Transfer Characteristics of Wide-Range Current Transformer Based on Zero-Flux Theorem
摘要
Abstract
Under the background of"Dual Carbon",the large-scale grid connections of new energy distributed power sources are characterized by intermittency and wide range load,which results in a wide dynamic range characteristics of current signals at the new energy grid connection point.Traditional current transformers are prone to exceeding error limits when the primary current is much lower than the rated current due to insufficient excitation of the iron core and low initial magnetic permeability.When the primary current exceeds the rated current,accuracy degradation may occur due to saturation of the iron core,making it difficult to measure power energy accuratly.In order to meet the requirements of high accuracy and wide range for current transformers,a passive zero-flux composite iron core current transformer based on electromotive force compensation is proposed.Through the introduction of unequal secondary windings and compensation windings on the main and auxiliary iron cores and selection of different iron core structure and materials according to the magnetic field distribution characteristics of the main and auxiliary iron cores,the main iron core works in a state of approximately zero magnetic flux.The control block diagram and transfer function of the current transformer with this structure are derived.Combined with simulation analysis and experimental verification,it is shown that the current transformer with this structure meets the accuracy requirements of 0.1 precision current transformer within the range of 0.1%to 200%of the rated primary current.An effective solution is provided for measuring current signals with a wide dynamic range in power systems under the background of new energy.关键词
电流互感器/宽量程/零磁通/电动势补偿/复合铁心Key words
current transformer/wide range/zero-flux/electromotive force compensation/composite iron core分类
信息技术与安全科学引用本文复制引用
张鼎衢,杨路,肖勇,宋强,王保帅,王岩,邢立坤..基于零磁通原理的宽量程电流互感器传变特性[J].南方电网技术,2024,18(11):150-158,9.基金项目
广东省科技计划资助项目(2021B1212050014) （2021B1212050014）
中国南方电网有限责任公司科技项目(GDKJXM20220280). Supported by the Science and Technology Program of Guangdong Province(2021B1212050014) （GDKJXM20220280）
the Science and Technology Project of China Southern Power Grid Co.,Ltd.(GDKJXM20220280). （GDKJXM20220280）
