De-icing scheme and experiment of long distance HV overhead power line based on capacitor compensating reactive current

The inductance of a long distance HV overhead power line increases with the extension of the line. In order to decrease the total impedance of the power line and ensure the system could provide effective de-icing current by using the de-icing method based on capacitor compensation reactive current, the measure of connecting series capacitor banks to the de-icing line for compensating the line inductance is applied. With the capacitor terminal voltage increment by using capacitor compensation de-icing method, a mean of improving the capacitor voltage insulation level to ground and series-mounting multi-group capacitor banks to the de-icing line for partial voltage are proposed to solve the problem that the rated voltage of existing 10 kV capacitor banks can not satisfy the operation requirements, which is caused by capacitor over-voltage during the de-icing process. The voltage vector relationship of capacitor and line impedance with the length of de-icing line variation is given based on the analog low voltage circuit simulation. Furthermore, the specified scheme and calculation for de-icing 220 kV LGJ400 transmission line with utilizing 10 kV capacitor banks supplied by 10 kV power source is proposed.