摘要
双芯移相变压器中有载分接开关开断级电压、电流的大小与负载条件关系密切,为了确定负载条件对有载分接开关技术参数的影响,在介绍双芯移相变压器的工作原理及运行特性的基础上,推导了实用、精确的负载条件下的级电压计算式,并以230 k V/150 MVA双芯移相变压器为例,通过对比计算式与MATLAB/SIMULINK仿真模型的结果,验证了级电压计算式的准确性。通过分析级电压与负载大小及性质的关系表明,采用负载条件下的级电压计算方法可更为准确地确定移相变压器有载分接开关的技术参数。此外,通过分析负载功率因数对最大级电压的影响可知级电压随着负载功率因数的增大而增大。
The breaking step voltage and current of on-load tap changer in two-core phase shifting are closely related to on-load conditions. To determine the effects of on-load conditions on technical parameters of the on-load tap changer, by introducing the working principle and operational characteristics of two-core phase-shifting transformer, we deduced a practical and accurate formula about step voltage under the conditions of on-load. Taking a 230 kV/150 MVA two-core phase-shifting transformer as an example, we verified the accuracy of the proposed formula by comparing the MATLAB/SIMULINK simulation results with the results obtained by the formula. Then,we analyzed the relationship between the step-voltage and the load characteristics.It is demonstrated that more accurate technical parameters of the on-load tap changer can be determined by the calculation method based on the on-load conditions. Furthermore, a conclusion is drawn that the step-voltage increases with the growth of power factor by analyzing the influence of the load power factor on the maximum step-voltage.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2017年第3期838-844,共7页
High Voltage Engineering
基金
国家电网公司科技项目(GYB17201400097)~~
关键词
双芯移相变压器
有载分接开关
级电压
负载条件
空载条件
two-core phase shifting transformer
on-load tap changer
step voltage
on-load conditions
no-load condition
