基于小电流法的电流互感器现场测试技术Field Test Technology of Current Transformer Based on Small Current Method
李航康,王新燕,许灵洁,陈骁,郭鹏,朱重冶
LI Hangkang,WANG Xinyan,XU lingjie,CHEN Xiao,GUO Peng,ZHU Chongye
摘要(Abstract):
通过测量电流互感器的相关电磁参数,研究电磁参数与误差的关系,计算出在给定条件下各测量点的误差,这种间接测量电流互感器误差的方法符合测量学的原理。研究的小电流法测试法,与低校高电压法和负荷外推法均有明显的差别,通过测量小于20%额定电流情况下的各点误差二次绕组直流电阻以及各点的励磁导纳,计算出所需测试工作点的互感器误差。提出了完整的理论推导和数学模型,经过实际互感器的测量比对,验证了方法的准确性和有效性。
By measurement of the electromagnetic parameters of current transformers and study of the relationship between these electromagnetic parameters and errors, and the error of each measurement point under given conditions is calculated. This method of indirect measurement of current transformer error is following the principle of measurement. The test method based on the small current method is quite different from the previous low-level high-voltage method and load extrapolation method. By measuring the error of each point under the condition of less than 20% of rated current and the DC resistance of the secondary winding and the excitation admittance of each point, the transformer errors of the required test operating point are calculated.The paper proposes a complete theoretical derivation and mathematical model. After the actual transformer measurement comparison, the accuracy and effectiveness of the method are verified.
关键词(KeyWords):
电流互感器;现场测试技术;测差法;低校高法
current transformer;field test technology;differential measurement method;low-level high-voltage method
基金项目(Foundation):
作者(Author):
李航康,王新燕,许灵洁,陈骁,郭鹏,朱重冶
LI Hangkang,WANG Xinyan,XU lingjie,CHEN Xiao,GUO Peng,ZHU Chongye
DOI: 10.19585/j.zjdl.201911008
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- 电流互感器
- 现场测试技术
- 测差法
- 低校高法
current transformer - field test technology
- differential measurement method
- low-level high-voltage method