为提高高压直流断路器阀塔绝缘设计可靠性,针对自主设计的±535 k V混合式高压直流断路器阀塔,采用CREO和ANSYS混合建模技术,搭建直流断路器阀塔的3维模型,并进行静电场求解。对该模型添加阀端间直流耐压试验电压,求解得到组件和屏...为提高高压直流断路器阀塔绝缘设计可靠性,针对自主设计的±535 k V混合式高压直流断路器阀塔,采用CREO和ANSYS混合建模技术,搭建直流断路器阀塔的3维模型,并进行静电场求解。对该模型添加阀端间直流耐压试验电压,求解得到组件和屏蔽系统的电场;添加阀支架直流耐压试验电压,求解得到阀支架的电场;在电场最大区域添加考察线,考察场强最大值周围空间电场分布规律。求解得到：±535 k V混合式高压直流断路器的最大场强为2.748 k V/mm,位于底层直屏蔽罩的倒角位置;离电极表面20 mm,场强减小至1.4 k V/mm;离电极表面40 mm,场强减小至1 k V/mm;离电极表面100 mm,场强减小至0.5 k V/mm以下。结果表明：±535 k V断路器的整体电场满足电场控制要求值,电极周围空气间隙中场强快速衰减。研究结果为±535 k V混合式高压直流断路器绝缘结构设计提供了可靠支撑,具有重要的借鉴价值。展开更多
The DC electric field is sometimes accompanied by space charges caused by the partial discharge in the air,which impacts DC electric field measurements.This paper describes the impact factors in the calibration and ap...The DC electric field is sometimes accompanied by space charges caused by the partial discharge in the air,which impacts DC electric field measurements.This paper describes the impact factors in the calibration and application of the field mill for measuring the DC electric field with space charges.First,the influence of the space charges on calibration results is evaluated and discussed.Then,both the impact of the height of the meter probe above the ground and the touch resistance between the ground and the meter on the measurement results are investigated.Correct calibration and application methods are presented.The results are expected to be of use to engineers for conducting accurate measurements of the DC electric field with space charges.展开更多
High electric field and temperatures can result in electrical property degradation of oil-paper insulation and accelerate its aging process.This paper describes the regulation of space charge in the process of electro...High electric field and temperatures can result in electrical property degradation of oil-paper insulation and accelerate its aging process.This paper describes the regulation of space charge in the process of electro-thermal aging.Electric field distortion and differences in characteristic parameters during electro-thermal aging are analyzed,along with the effects of electro-thermal aging on space charge from the perspective of trap energy.High temperature and an electric field are used to accelerate the aging of oil-paper,and space charge characteristics are measured using the pulsed electro-acoustic(PEA)method throughout the electro-thermal aging.Based on results obtained,it can be concluded that homo-charge injection occurs at the anode and the type of the charge injection at the cathode varies throughout the electro-thermal aging;the decrease of permittivity during aging allows for space charge injection to take place;growth of trap depth makes the space charge accumulate in the middle of the sample;and space charge accumulation after electro-thermal aging results in inner electric field distortion,which leads to large current and decreased breakdown in voltages.展开更多
针对空间电磁环境监测需求,该文介绍了双探针式在轨电场探测方法。概述了双探针式、天线式和电子漂移式3种检测方法的异同,重点探讨了双探针式电场测量方法的原理、系统组成及测试标定方法。设计实现了敏感探头和数据采集处理单元,通过...针对空间电磁环境监测需求,该文介绍了双探针式在轨电场探测方法。概述了双探针式、天线式和电子漂移式3种检测方法的异同,重点探讨了双探针式电场测量方法的原理、系统组成及测试标定方法。设计实现了敏感探头和数据采集处理单元,通过阻容耦合方式模拟电场仪在轨工作环境对系统进行了测试。测试结果显示SLF,VLF和HF频段的噪声本底分别小于1 1/24 Vm H zμ,1 1/21 Vm H zμ和1 1/20.5 Vm H zμ。展开更多
文摘为提高高压直流断路器阀塔绝缘设计可靠性,针对自主设计的±535 k V混合式高压直流断路器阀塔,采用CREO和ANSYS混合建模技术,搭建直流断路器阀塔的3维模型,并进行静电场求解。对该模型添加阀端间直流耐压试验电压,求解得到组件和屏蔽系统的电场;添加阀支架直流耐压试验电压,求解得到阀支架的电场;在电场最大区域添加考察线,考察场强最大值周围空间电场分布规律。求解得到：±535 k V混合式高压直流断路器的最大场强为2.748 k V/mm,位于底层直屏蔽罩的倒角位置;离电极表面20 mm,场强减小至1.4 k V/mm;离电极表面40 mm,场强减小至1 k V/mm;离电极表面100 mm,场强减小至0.5 k V/mm以下。结果表明：±535 k V断路器的整体电场满足电场控制要求值,电极周围空气间隙中场强快速衰减。研究结果为±535 k V混合式高压直流断路器绝缘结构设计提供了可靠支撑,具有重要的借鉴价值。
基金supported in part by the Basic Research Program of China National Basic Research Program of China(973 Program)under Grant 2011CB2094-01in part by the National Natural Science Foundations of China under Grant 51322703.
文摘The DC electric field is sometimes accompanied by space charges caused by the partial discharge in the air,which impacts DC electric field measurements.This paper describes the impact factors in the calibration and application of the field mill for measuring the DC electric field with space charges.First,the influence of the space charges on calibration results is evaluated and discussed.Then,both the impact of the height of the meter probe above the ground and the touch resistance between the ground and the meter on the measurement results are investigated.Correct calibration and application methods are presented.The results are expected to be of use to engineers for conducting accurate measurements of the DC electric field with space charges.
基金supported by National Basic Research Program of China(973 Program)under Grant 2011CB209400。
文摘High electric field and temperatures can result in electrical property degradation of oil-paper insulation and accelerate its aging process.This paper describes the regulation of space charge in the process of electro-thermal aging.Electric field distortion and differences in characteristic parameters during electro-thermal aging are analyzed,along with the effects of electro-thermal aging on space charge from the perspective of trap energy.High temperature and an electric field are used to accelerate the aging of oil-paper,and space charge characteristics are measured using the pulsed electro-acoustic(PEA)method throughout the electro-thermal aging.Based on results obtained,it can be concluded that homo-charge injection occurs at the anode and the type of the charge injection at the cathode varies throughout the electro-thermal aging;the decrease of permittivity during aging allows for space charge injection to take place;growth of trap depth makes the space charge accumulate in the middle of the sample;and space charge accumulation after electro-thermal aging results in inner electric field distortion,which leads to large current and decreased breakdown in voltages.
文摘针对空间电磁环境监测需求,该文介绍了双探针式在轨电场探测方法。概述了双探针式、天线式和电子漂移式3种检测方法的异同,重点探讨了双探针式电场测量方法的原理、系统组成及测试标定方法。设计实现了敏感探头和数据采集处理单元,通过阻容耦合方式模拟电场仪在轨工作环境对系统进行了测试。测试结果显示SLF,VLF和HF频段的噪声本底分别小于1 1/24 Vm H zμ,1 1/21 Vm H zμ和1 1/20.5 Vm H zμ。
