| There are 9 lines of existing 10 kV lines in Yanchi county,such as Liuyang bao line, Bachaliang line, Subujing line, Caijialiang line, and Huinong line,Huima line, Haojitai line, Yaer line, Houguiline,these lines are longer than 100km. Take Liuyang bao line for example, the length of the line is 175.774km, electricity radius of 49.6 km, a total of 102 sets of transformers, in the long run especially in agricultural irrigation season, the voltage of the end of line has dropped dramatically. Regulating the local transformer still fail to meet the requirement, and adjusting is limited to the continual power supply requirement for irrigation by farmers. In addition, transformers are scattered in locations, the adjustment is difficult. During the slack season, basically there are no loads in the line and it will lead to high voltage in the terminal, transformer still needs to be adjusted to a normal situation. The situation will increase the actual workload of frontline, on the other hand if the adjustment is not timely, it may cause damages to equipment. Field officers have tried to regulate the export voltage of substation, yet causing High voltage to load near the exit of the line and City network users which needs transformer adjustment. That couldnot meet both consumers. As the voltage quality failed, causing low power factor, much line loss, such as in 2005 the average line loss 22.57%, in 2006 21.81%, in 2006 average power factor of substation exports Department is 0.74, the end may be lower.In addition,there is only overcurrent protection in the existing 10kV lines in Yanchi county, but not instant protection, time and accuracy are unable to meet the requirements. When the line is repaired, the inrush current is very large. Particularly the adaption between lines and substations need to be resolved surgently.
|
PDF Full Text Request