Influences of circuit parameters of capacitor voltage transformer on grid harmonic voltage measurements

被引：0
作者：
机构：
[1] China Electric Power Research Institute, Wuhan , 430074 , Hubei Province
来源：
Feng, Yu | 1600年 / Chinese Society for Electrical Engineering卷 / 34期
关键词：
Capacitor voltage transformers (CVT); Cascade classification analysis; Damper parameters; Equivalent stray capacitors; Harmonic voltage measurements;
D O I：
10.13334/j.0258-8013.pcsee.2014.28.025
中图分类号：
学科分类号：
摘要：
The capacitor voltage transformers (CVT) are widely used in China for most of power grids above 66 kV. The rules of harmonic transfer characteristics of CVTs are still unknown so that the measurement of harmonic voltage is hard to operate. This paper demonstrated that CVT can be equivalent to a linear circuit in harmonic conditions, and a kind of cascade classification method was proposed based on that property. The method was useful to get the impact rules between CVT circuit parameters and its harmonic transfer characteristics. The simulation results show that equivalent stray capacitance of the primary side of intermediate transformers can cause some kinds of enlargement of CVTs amplitude-frequency characteristics at a frequency above 1 kHz, damper parameters can affect the rate of frequency characteristics. Besides that, influence of parameter changes such as 1 to 10 times of rated load and 0.1 to 1 times of rated magnetizing impedance of intermediate transformers can be ignored for frequency characteristics of CVTs. Overall, the conclusions are very useful for CVT product design and application in harmonic voltage measurements. ©2014 Chinese Society for Electrical Engineering
引用
收藏
页码：4968 / 4975
页数：7
相关论文
共 27 条
  • [11] Xiao Y., Fu J., Hu B., Et al., Problems of voltage transducer in harmonic measurement, IEEE Transactions on Power Delivery, 19, 3, pp. 1483-1487, (2004)
  • [12] Duan X., Harmonic test method for 500 kV substation, Electrical Equipment, 5, 12, pp. 43-44, (2004)
  • [13] Liu Z., AC Current Instrument Transformer Volume of SGCC Supplies Purchasing Standard (2009 edition), pp. 1-172, (2009)
  • [14] Lou W., Span of realize BP network's theory to practice, Transactions of Haerbing Engineering University, 27, B07, pp. 59-63, (2006)
  • [15] Ghassemi F., Gale P., Cumming T., Et al., Harmonic voltage measurements using CVTs, IEEE Transactions on Power Delivery, 20, 1, pp. 443-449, (2005)
  • [16] Gong X., Kong W., Yu Z., Et al., Experimental research on wide frequency transfer characteristics of voltage and current transformers in substations, High Voltage Engineering, 35, 7, pp. 1736-1742, (2009)
  • [17] Wu M., Research on wide-band transfer characteristics of instrument transformers and transient characteristics of grounding grids in substations, (2003)
  • [18] Zhang Y., The transient overreach research of capacitive voltage transformer, (2005)
  • [19] Wang L., Fang B., Simulations on transient characteristics of 500 kV capacitor voltage transformer, High Voltage Engineering, 38, 9, pp. 2389-2396, (2012)
  • [20] Li X., Ye G., Wang X., Et al., Transient characteristics of 1 000 kV capacitor voltage transformer based on ATP-EMTP, High Voltage Engineering, 34, 9, pp. 1850-1855, (2008)
123