Admittance matrix models of three-phase transformers with various neutral grounding configurations

被引：19

作者：

Irving, MR ^{[1
]}

Al-Othman, AK ^{[1
]}

机构：

[1] Brunel Univ, Brunel Inst Power Syst, Uxbridge UB8 3PH, Middx, England

来源：

IEEE TRANSACTIONS ON POWER SYSTEMS | 2003年 / 18卷 / 03期

关键词：

grounding impedances; neutral grounding; nodal admittance matrices; three-phase transformers;

D O I：

10.1109/TPWRS.2003.814905

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 [电气工程]; 0809 [电子科学与技术];

摘要：

Nodal admittance matrix models are obtained for Wye-connected three-phase transformers with various grounding impedance configurations. The derivations have been performed using computational symbolic algebra, avoiding the, necessity for simplifying assumptions. An original model for the general case of a Wye-Wye transformer, with grounding impedances on both primary and secondary neutrals, is given. It is shown that this model does not correspond to the simple combination of the previously known formulae for cases where neutral impedance occurs on either the primary side only or the secondary side only. It is also demonstrated that the new model simplifies to the well-known limiting cases for solid grounding and no grounding. A model is also given for multiple transformers sharing a single neutral grounding impedance.

引用

页码：1210 / 1212

页数：3