Measurement of relative permittivity , dielectric dissipation factor at power frequency and volume resistivity of insulating liquids 液体绝缘材料工频相对介电常数介质损耗因数和体积电阻率的测量
Insulating liquids - determination of dielectric dissipation factor by measurement of the conductance and capacitance - test method 绝缘液体.通过测量电导率和电容量来测定介电损耗因数.试验方法
Insulating liquids - determination of the dielectric dissipation factor by measurement of the conductance and capacitance - test method iec 61620 : 1998 ; german version en 61620 : 1999 绝缘液体.通过测量电导率和电容量来测定介电损耗因数
Aiming at on - line supervision of capacitive equipment ’ s insulation , this dissertation performs some studies on the improving of the algorithmic routine of dissipation factor and its applications 本文以容性设备介质损耗因数在线监测为目的,重点研究了介质损耗值在线监测算法的改进及其应用。
Calculation of the current rating of electric cables . part 1 : current rating equations 100 % load factor and calculation of losses . section 2 : sheath eddy current loss factors for two circuits in flat formation 电缆载流量计算.第1部分：载流量公式100 %负荷因数和损耗计算.第2节：双回路平面排列电缆金属套涡流损耗因数
The dissipation factor of the capacitive equipment only rests with the material ’ s characteristics and is independent of size or shape . so it is one of the most effective means to prefigure the insulating disfigurement of the dissertation equipments 容性设备介质损耗因数仅取决于材料的特性,与材料的尺寸、形状无关,是发现电气绝缘方面缺陷最有效的手段之一。
The paper introduces electric power insulation material ’ s dielectric loss mechanism under the action of electric field , points out the major factors which influence insulating oil dielectric loss and important significance of measuring dielectric loss 论文介绍了电力绝缘材料在电场作用下产生介质损耗的机理,指出影响绝缘油介质损耗因数的主要因素和测量绝缘油介质损耗的意义。
Firstly , this dissertation makes an in - depth study on the principium of on - line supervision of capacitive equipment ’ s insulation . diversified algorithmic routines that based on software are analysed and compared to find out their merits or defects 首先,深入了解了容性设备介质损耗因数tan在线监测的工作原理,讨论了以软件为主的各种介损值在线监测算法,对其基本原理及优缺点进行了分析。
The measurement of dielectric loss and volume resistivity is effective preventive tests to judge insulating oil isolation status of polluted and aging , and it ' s important method of ensuring the safe operation of transformer and oil - filled circuit breaker , etc . however , the measuring systems of insulating oil dielectric loss and volume resistivity used at present exist the shortcoming of low accuracy , weak repeatability , inconvenience , and its thermostatic control system ca n ' t meet the challenge 绝缘油的介质损耗因数、体积电阻率测量，是判断绝缘油的劣化与污染程度的有效预防性试验，是保障变压器、油断路器等充油电力设备安全运行的重要手段。然而，目前所使用的绝缘油介质损耗因数、体积电阻率测试系统存在着测量精度低、测量结果重复性不好、控温系统不能满足控温要求、操作不便等缺陷，针对这一现状，本文对绝缘油介损及体积电阻率一体化测试系统进行了研究。
With the rapid development of electric power enterprise , the demand on the reliability of electric power system is further more , and the development of insulation monitoring technique has been paid more attention . oil - filled equipment plays a very important role in power system , and the dielectric loss factor ( tg ) is an important parameter to reflect the insulation condition . therefore , studying the tg of insulating oil is of important practical meaning 随着电力事业的迅速发展,对电力系统运行可靠性要求将越来越高,电气设备绝缘检测技术的发展更加受到重视。充油设备在电力系统中占有相当大的比例,而绝缘油介质损耗因数是反映其绝缘状况的重要参数。因此,研究绝缘油介质损耗因数的测量方法具有十分重要的实际意义。
