Medium-voltage(MV)and high-voltage(HV)power cables constitute an important role for the continuous energy delivery to the customers.Despite a network redundancy,high reliability of the cable connections is necessary t...Medium-voltage(MV)and high-voltage(HV)power cables constitute an important role for the continuous energy delivery to the customers.Despite a network redundancy,high reliability of the cable connections is necessary to maintain required network reliability.During the past period,the cable production technology has been a subject to a continuous change.For that reason,utilities around the world operate a number of cable types in their networks.Particularly,in the Netherlands,the distribution grid is constructed only with cables.Moreover,parts of the transmission grid also consist of HV power cables.The cable connections being in operation for a period of over 30 years suffered from different stresses during their service time.This continuous stressing results in gradual decrease of operational abilities and inevitable failure occurrence.In the period from 2008 to 2014,in the High-Voltage Group at TU Delft,several research projects on the reliability of MV and HV power cables of different types have been run.The current article contains a detailed review of the work that has been done.In each case,the problem description together with the applied methodologies and obtained results is presented.At the end of the paper,the suggestions for future researchers are展开更多
The past decade has been very busy and exciting times for the underground power cable industry.This paper starts with a brief introduction of the past 100 years and then reviews papers presented at recent JICABLE and ...The past decade has been very busy and exciting times for the underground power cable industry.This paper starts with a brief introduction of the past 100 years and then reviews papers presented at recent JICABLE and CIGRE conferences.Over the past decade both on-line and off-line diagnostics have seen rapid development,HVDC cables have extended interconnection lengths to 600 km and HVAC cables are now commonly installed for distances up to 100 km.And at the same time advanced materials,higher operating voltages and improved cable accessory designs have supported all of these advances.In short,it is an excellent time to review underground power cable technology.展开更多
Power line communication(PLC)provides intelligent electrical functions such as power quality measurement,fault surveys,and remote control of electrical network.Most of research works have been done in low voltage(LV)s...Power line communication(PLC)provides intelligent electrical functions such as power quality measurement,fault surveys,and remote control of electrical network.Most of research works have been done in low voltage(LV)scenario due to the fast development of in-home PLC.The aim of this paper is to evaluate the link-level performance of a medium voltage(MV)MIMO-OFDM communication system based on transmission link under underground power line channel.The MIMO channel is modeled as a modified multipath model in the presence of impulsive noise and background noise.We first perform a measurement on the practical MV MIMO channel parameters for a section of buried cable of 1 km long in Ganzhou city,Jiangxi province,China.Based on the measured channel,we design the frame structure based on an IEEE standard for broadband over power line networks[1]to support MV MIMO-OFDM transmission.According to designed frame structure,we design an encoder and a decoder for a dual binary tail-biting turbo code and optimize some key decoder parameters for low bit error rate performance.Finally,the link-level performance for both spatial multiplexing and spatial diversity are evaluated.Numeral results show that MV MIMO-OFDM is a promising approach to provide both high data rate and link reliability for PLC.展开更多
文摘Medium-voltage(MV)and high-voltage(HV)power cables constitute an important role for the continuous energy delivery to the customers.Despite a network redundancy,high reliability of the cable connections is necessary to maintain required network reliability.During the past period,the cable production technology has been a subject to a continuous change.For that reason,utilities around the world operate a number of cable types in their networks.Particularly,in the Netherlands,the distribution grid is constructed only with cables.Moreover,parts of the transmission grid also consist of HV power cables.The cable connections being in operation for a period of over 30 years suffered from different stresses during their service time.This continuous stressing results in gradual decrease of operational abilities and inevitable failure occurrence.In the period from 2008 to 2014,in the High-Voltage Group at TU Delft,several research projects on the reliability of MV and HV power cables of different types have been run.The current article contains a detailed review of the work that has been done.In each case,the problem description together with the applied methodologies and obtained results is presented.At the end of the paper,the suggestions for future researchers are
文摘The past decade has been very busy and exciting times for the underground power cable industry.This paper starts with a brief introduction of the past 100 years and then reviews papers presented at recent JICABLE and CIGRE conferences.Over the past decade both on-line and off-line diagnostics have seen rapid development,HVDC cables have extended interconnection lengths to 600 km and HVAC cables are now commonly installed for distances up to 100 km.And at the same time advanced materials,higher operating voltages and improved cable accessory designs have supported all of these advances.In short,it is an excellent time to review underground power cable technology.
文摘Power line communication(PLC)provides intelligent electrical functions such as power quality measurement,fault surveys,and remote control of electrical network.Most of research works have been done in low voltage(LV)scenario due to the fast development of in-home PLC.The aim of this paper is to evaluate the link-level performance of a medium voltage(MV)MIMO-OFDM communication system based on transmission link under underground power line channel.The MIMO channel is modeled as a modified multipath model in the presence of impulsive noise and background noise.We first perform a measurement on the practical MV MIMO channel parameters for a section of buried cable of 1 km long in Ganzhou city,Jiangxi province,China.Based on the measured channel,we design the frame structure based on an IEEE standard for broadband over power line networks[1]to support MV MIMO-OFDM transmission.According to designed frame structure,we design an encoder and a decoder for a dual binary tail-biting turbo code and optimize some key decoder parameters for low bit error rate performance.Finally,the link-level performance for both spatial multiplexing and spatial diversity are evaluated.Numeral results show that MV MIMO-OFDM is a promising approach to provide both high data rate and link reliability for PLC.
