[外文翻譯]SEL-321相間距離保護靜態(tài)特性與動態(tài)特性及試驗方法/The SEL-321 interaction is away from the protection static characteristic and the dynamic characteristic and the testing method
內包含中文翻譯和英文原文，內容完善，建議下載閱覽。

①中文頁數 3

中文字數 2352

②英文頁數 4

英文字數 1464

③ 摘要
Schweitzer工程試驗室(SEL)的微機線路保護采用了帶補償的負序阻抗方向元件。在負序阻抗平面上，當發(fā)生不對稱故障時，若實際測量負序阻抗Z2=U2/I2(式中U2，I2分別為輸入繼電器的故障電壓、電流的負序分量)的點落在z2=Z2Fb(式中z2為測量負序阻抗在線路負序抗角方向的投影，Z2Fb為SEL繼電器根據不同Z2計算出的正向動作閾值)曲線下側時(z2≤Z2Fb)判別為正方向故障，落在z2=Z2Rb(式中Z2Rb為SEL繼電器根據不同Z2計算出的反向動作閾值)曲線上側時判別為反方向故障。這種負序方向元件的整定值和動作特性與裝置運行的實際系統(tǒng)負序阻抗有關，因此在對采用這種負序方向元件的保護進行繼電器檢驗、試驗時，應注意試驗方法，如果用檢驗傳統(tǒng)繼電器的試驗方法，很可能會遇到一些問題。

Schweitzer the engineering laboratory (SEL) microcomputer line protection has used the belt compensation negative sequence impedance directional element. In negative sequence impedance plane, when has the asymmetric failure, if actual surveys negative sequence impedance Z2=U2/I2 (in the formula U2, I2 respectively be inputs relay's breakdown voltage, electric current negative sequence component) the spot falls in z2=Z2Fb (in the formula z2 is survey negative sequence impedance in line negative sequence anti-angle direction projection, Z2Fb is forward movement threshold value which SEL relay basis different Z2 calculates) when the curve breast (z2≤Z2Fb) distinction for the direction breakdown, falls, in z2=Z2Rb (in the formula Z2Rb is backward action threshold value which SEL relay basis different Z2 calculates) when the curve upper side (z2≥Z2Rb) distinction for reversed direction breakdown. This kind of negative sequence directional element's installation value and movement characteristic and equipment movement actual system negative sequence impedance related, therefore when to uses this kind of negative sequence directional element's protection carries on the relay examination, the experiment, should pay attention to the testing method, if with the examination tradition relay's testing method, will possibly meet some questions.

④關鍵字 線路保護/ line protectio