Development of simple coupling-capacitor voltage transformer for GIS
Development of simple coupling-capacitor voltage transformer for GIS
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DOI：
10.1109/pesw.2001.917047
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发表时间：
2001-01
期刊：
影响因子：
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通讯作者：
T. Yamada;E. Kurosaki;N. Yamamoto;M. Matsumoto
中科院分区：
文献类型：
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作者：
T. Yamada;E. Kurosaki;N. Yamamoto;M. Matsumoto
二次负载大于50伏安的磁力电压互感器(VT)常用于地理信息系统。然而，由于目前数字化控制交换机的A/D转换器的负载仅限于几伏安，负载容量过大且不经济。为此，作者开发了一种简单的耦合电容型电压互感器(SVT)，通过在GIS的分支母线上插入一个圆柱形电容电极来满足集散控制系统的低负荷性能。为了保持/SPL+MN/3%的精度，由于电压受外部负载变化的影响，该系统中的数字控制处理单元对SVT的二次输出电压进行了校正。同轴电缆也被用作抵御温度变化的措施。结果，他们发现，开发的SVT在-20/SPL deg/C到+60/SPL deg/C的环境温度范围内提供了/SPL内加MN/3%的精度。
A magnetic voltage transformer (VT), with a secondary load of more than 50 VA, is usually used for a GIS. However, the capacity of the load is too large and not economical since the load of A/D converter of a digitized control switchboard (DCS) is recently limited to only several VA. Therefore, the authors have developed a simple voltage transformer (SVT) of coupling-capacitor type to meet the performances of DCS with low load, by inserting a cylindrical capacitor electrode into the branch bus of a GIS. To maintain the required accuracy of /spl plusmn/3%, the secondary output voltages from the SVT were corrected by the numerical control process unit of the DCS in this system, since the voltages were influenced by variation in external load. Coaxial cables were also applied as a measure against temperature variation. As a result, they found that the developed SVT provided accuracy of within /spl plusmn/3% in ambient temperature between -20/spl deg/C to +60/spl deg/C.