Optimization Analysis of 1 kHz High Frequency De-icing for Medium Voltage Transmission Lines
Medium voltage transmission lines have a wide ice-coating range in winter which,due to the short length of line,is difficult to use DC and power frequency AC for de-icing and leads to frequent occurrence of such faults as line breakage,ruined tower and tripping because of ice flash.In this paper,the 1 kHz high frequency de-icing method is proposed.The influence and feasibility of different high frequency de-icing wiring methods,the line distribution parameters and the reactive power compensation are analyzed.The LGJ-240/30 wire is taken as an example,under the action of current at 762 A and the frequency at 1 kHz,the de-icing simulation experimental results show that in case of length of wire is no more than 36.3 km,the difference of the de-icing time influenced by the distribution parameters is less than 1% and can be ignored;In combination with the insulation withstanding level of line at 10 kV,the AC de-icing with the frequency at 1 kHz is suitable for the short line with power supply radials less than 5 km.The use of the de-icing wiring method of three phase short circuit and the segmented series capacitive compensation measures can meet the insulation requirement of line,which can reduce effectively the capacity of de-icing voltage and power.
high-frequency excitation de-icingmedium voltage transmission linesdielectric losscurrent skin effectreactive power compensation
万方数据
维普
