The main purpose of the work presented here is to evaluate different methods for quality control of polymeric insulated HVDC cables.The insight gained can be used to evaluate proposed test methods for quality assuranc...The main purpose of the work presented here is to evaluate different methods for quality control of polymeric insulated HVDC cables.The insight gained can be used to evaluate proposed test methods for quality assurance of long lengths of polymer insulated power cables.Laboratory experiments were performed using both Rogowski shaped test objects and model cables,insulated with XLPE containing imbedded spherically shaped particles.Tests were performed by stressing the test object with AC(50 Hz),VLF(0.1 Hz) and DC voltages and measuring time to breakdown at the different voltages.The slope of the voltage-time curve for 0.1 and 50 Hz were found to be parallel showing higher breakdown strength for 0.1 Hz than 50 Hz.The number of periods to breakdown is somewhat higher for 0.1 Hz than for 50 Hz.The breakdown strength for DC was much higher than for both AC 50 Hz and 0.1 Hz.The results indicate that the VLF test voltage needs to be 2 to 3 times higher than at 50 Hz power frequency in order to eliminate the same defects within a comparable time.展开更多
海缆制造是一个比较复杂的生产项目,对每个环节的质量管控都至关重要。结合海缆监造项目,分别介绍了海缆生产前准备阶段、生产阶段及验收阶段的控制要点,并以蓬莱-沈家湾110 k V输电线路工程海缆监造项目为例,分析了海缆监造过程2起事...海缆制造是一个比较复杂的生产项目,对每个环节的质量管控都至关重要。结合海缆监造项目,分别介绍了海缆生产前准备阶段、生产阶段及验收阶段的控制要点,并以蓬莱-沈家湾110 k V输电线路工程海缆监造项目为例,分析了海缆监造过程2起事件的经过、原因及纠正措施。指出生产设备的维护和对生产工艺细节检查的重要性,并强调监造项目部对生产单位的设备维护记录及生产过程记录的核查应作为海缆监造工作的重点。展开更多
文摘The main purpose of the work presented here is to evaluate different methods for quality control of polymeric insulated HVDC cables.The insight gained can be used to evaluate proposed test methods for quality assurance of long lengths of polymer insulated power cables.Laboratory experiments were performed using both Rogowski shaped test objects and model cables,insulated with XLPE containing imbedded spherically shaped particles.Tests were performed by stressing the test object with AC(50 Hz),VLF(0.1 Hz) and DC voltages and measuring time to breakdown at the different voltages.The slope of the voltage-time curve for 0.1 and 50 Hz were found to be parallel showing higher breakdown strength for 0.1 Hz than 50 Hz.The number of periods to breakdown is somewhat higher for 0.1 Hz than for 50 Hz.The breakdown strength for DC was much higher than for both AC 50 Hz and 0.1 Hz.The results indicate that the VLF test voltage needs to be 2 to 3 times higher than at 50 Hz power frequency in order to eliminate the same defects within a comparable time.
文摘海缆制造是一个比较复杂的生产项目,对每个环节的质量管控都至关重要。结合海缆监造项目,分别介绍了海缆生产前准备阶段、生产阶段及验收阶段的控制要点,并以蓬莱-沈家湾110 k V输电线路工程海缆监造项目为例,分析了海缆监造过程2起事件的经过、原因及纠正措施。指出生产设备的维护和对生产工艺细节检查的重要性,并强调监造项目部对生产单位的设备维护记录及生产过程记录的核查应作为海缆监造工作的重点。
