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电纳.
电纳(Susceptance),在电力电子学中被定义为电抗的倒数,是导纳的虚数部分,按性质可分为容纳和感纳。电纳的物理表达符号为B,单位是西门子,简称西(S)。
定义电纳的一般方程为:
其中:
- Y是导纳,单位为西门子;
- G是电导,单位为西门子;
- j是虚数单位;
- B是电纳,单位为西门子。
整理,得:
- .
但由于
- ,
我们便得:
- .
导纳(Y)是阻抗(Z)的倒数。
或者:
其中
- Z是阻抗,单位为欧姆;
- R是电阻,单位为欧姆;
- X是电抗,单位为欧姆。
电纳是导纳的虚数部分。
导纳的大小为:
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