1) impedance protective system
阻抗保护系统
2) impedance protection
阻抗保护
1.
Analysis on defects of impedance protection for transformer;
变压器阻抗保护缺陷的分析
2.
On basis of actual condition at site and with reference of theoretical analysis and calculation, analyzes the parameter setting for impedance at load side in quadrangular impedance protection at present time, points out its imperfection, brings up the setting method for impedance at the load side and therefore improves the accuracy for quadrangular impedance protection setting.
本文根据现场实际情况,结合理论分析计算,对目前四边形阻抗保护中负荷边阻抗值的参数取值进行了分析,指出了不足之处,提出了负荷边阻抗值新的整定方法,由此提高了四边形阻抗保护整定值的准确性。
3.
This article quantitatively analyzes the formation of remote impedance protection dead zone of WXB-63 computer feeder protection device, proposes the counter measures for elimination of remote protection dead zone by means of adjusting the offset resistance which may protect the whole length of line without modifying the soft and hard ware of device.
本文用短路试验数据定量地分析了WXB-63型微机馈线保护装置阻抗保护远端死区的形成,并提出了通过调整偏移电阻的方法来消除远端保护死区的解决方案,可以在不改变装置原有软、硬件的情况下保护线路全长。
3) SPS Shock Protection System
抗震保护系统
4) antioxidant protection system
抗氧化保护系统
1.
Study on antioxidant protection system of eight species of Seriphidium (Bess.) Poljak. seedlings
8种绢蒿属植物幼苗抗氧化保护系统研究
5) system impedance
系统阻抗
1.
For the important characteristic of the source system impedance applied in the power system, a novel method of on-line measurement for the source system impedance is proposed, which utilized the dynamic process of spontaneous short-circuit of the rectifier current transition.
针对电网的系统阻抗参数在电力系统应用中的重要作用,提出一种在线实时电网系统阻抗测量方法。
2.
It considers that the economic and feasible measures that decrease the voltage fluctuation of the bus bar are to reduce the system impedance and reasonably distribute impacting load users.
通过对新余钢铁公司四总降6kV母线电压波动原因进行分析,指出减小系统阻抗及合理分配冲击性负荷用户是降低母线电压波动过大较经济、可行的措施,同时对大容量快速开关的技术特点作了较详细介绍。
3.
Introducing the principle of adaptive instantaneous trip current protection,the discrimination method of short circuit fault type,the real time and on-line calculation method of system impedance,the calculation method of jump-value of current and the protection area of adaptive instantaneous trip current protection respectively.
介绍了自适应电流速断保护的原理,短路故障类型的识别方法,系统阻抗的在线实时计算方法,电流突变量的提取方法及自适应电流速断保护的保护范围。
6) the protecting enzymes of antioxidant system
抗氧化系统保护酶
1.
the results indicated that the protecting enzymes of antioxidant system,such as CAT,SOD,and POD existed different genetic characters.
用5个早熟不早衰的短季棉品种和5个早衰的短季棉品种进行双列杂交,并对亲本、F1和F2代于2001年和2002年田间试验研究与短季棉早熟不早衰有关的抗氧化系统保护酶(SOD、POD和CAT)、叶绿素及激素(生长素和脱落酸)的遗传特性。
补充资料：星接阻抗和三角接阻抗的变换
星接阻抗和三角接阻抗的变换
transformation between starc-onnected and delta-connected impedances
x ing]一e乙日kongl介e sonJ一00}Iez日伙ongde匕一。一〕huon星接阻抗和三角接阻抗的变换(t ransfor-mation betweenstar一eonneeted and delta-eonneeted imPedanees)接成星形的三个阻抗和接成三角形的三个阻抗互相替代的等效变换。它们之间的关系可用一组变换公式表示。按这组公式，用星接阻抗替换三角接阻抗或者反过来，不会影响稳态下电路其他部分的正弦电压和电流，常用于对称三相电路的分析和计算。 图1为三个阻抗21、Z:、23接成星形(又称丫形)。图2为三个阻抗Z小22。、Zal接成三角形(又称△形)。它们之间的变换公式如下:人23土图1星接阻抗图2三角接阻抗(1)将星形连接变换成三角形连接212一Z:+22+2 122及3一22+za十警(1)、|冬|矛231一23+21+2321(2)将三角形连接变换成星形连接z、-二一典乒兴-) 艺‘2士乙“3十乙31…_2 oqZI，}Z。一下万~一二-二二-汁 乙‘2士乙23十乙3‘1_Z。IZoq}艺q一二二一~二，二二--，-二二-~J 乙12十乙23十艺32夕(2) 当三个星接阻抗相等，即21一Z:一23一z丫、三个三角接阻抗相等即212一223一231一Z△时，变换公式是 Z二一32丫，Z丫一Z△/3
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条