In order to decrease surge current and over voltage when the var compensation capacitors being plunged into power system

the synchronous closing technology based on PIC was described in this paper.The PIC as the CPU was used to deal with data and sends controlling order

and CS5460A was used to measure power factor in the synchronous closing technology system.Forecasting the closing time accurately was the key point of the synchronous closing technology system.Double-bilinear interpolation with forecasting the closing time was described in this paper.In order to simplify the CPU work

normalization was applied to the data.The result of experiment shows that double-bilinear interpolation with forecasting the closing time is practicable.