|转至：电工电力论坛
a.SF6气体绝缘
b.倒立式结构
c.头部壳体为铝制件，其内装有二次绕组及一次导电杆。
d.绝缘套管是一个外表面灌注硅橡胶伞裙的玻璃纤维增强套管。
e.二次绕组引出线通过引线导管引至底座上的接线盒内。
f.头部壳体顶端装有防爆片，一旦内部发生高能放电，气体压力超过0.7MPa时，防爆片破裂，达到压力释放目的。
g.底座上装有密度表，可显示互感器内部的气体密度及压力（显示值为转换成20度时的内部气体压力，密度表具有温度补偿作用并带有两对触头，当互感器内部压力降到报警压力时提供信号）
SF6气体额定压力（20度）0.39MPA
SF6气体报警压力（20度）0.35MPA
a.倒立式全封闭式SF6气体绝缘
b.二次引线经绝缘套管、底座引出
c.一次绕组用铜棒穿过二次绕组，绕组间主绝缘为SF6气体
d.底座上设有SF6气体充放气阀
e.底座对角线上焊有两个不锈钢接地板，供运行时接地用
f.壳体上部设有压力释放器，当由于意外致使产品内部出现危险的高压力时，压力释放器的膜片破碎使压力释放，爆破压力0.7MPA。
g.
SF6气体额定压力（20度表压）0.4MPA
SF6气体报警压力（20度表压）0.35MPA
35kV电流互感器技术参数
LVBT-40.5W3 （L：电流互感器，V：倒立式，B：带稳态保护，T：带暂态保护，40.5：设备最高电压，W3：IV级耐污）
LVB-40.5W3
a.倒立式油纸绝缘
b.一次绕组为贯穿式
c.主绝缘包绕在二次绕组组件及其引线上，一次绕组不包绕绝缘，因而散热性好，温升低，抗热稳定性能好。
d.全密封结构，顶部装有不锈钢波纹式金属膨胀器，使CT内部与空气隔离。
e.底座上设置有二次接线板、放油阀及接地板。
二次绕组准确级介绍
1、TPY：TP类是具有暂态特性的保护用电流互感器。TPY级铁芯剩磁不超过饱和磁密的10%。TPY级为小气隙环形铁芯，由于存在小气隙，励磁阻抗减小，二次闭合回路时间常数TS减小，动态剩磁的衰减加快，有利于改善暂态误差。其中T代表暂态，P代表保护，Y代表气隙。
选型原则：330-500kV线路保护、高压侧为330-500kV的变压器保护，和300MW及以上的发电机组保护，由于一次系统时间常数大，TA暂态饱和严重，宜用TP类TA.
例如：500kV线路保护，因超高压线路保护均配置有重合闸，当重合闸合至永久故障线路时，电流互感器处于重复励磁状态，而此时系统又要求线路保护能在20-30ms内再次可靠动作，切除永久故障。这就要求电流互感器满足饱和倍数和暂态误差的要求，选用TPY时，可保证在两次主保护动作时，TA铁芯不饱和且准确传变一次电流。
专栏：行业资讯
作者：
行业资讯
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行业资讯
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