| 摘要 |
PURPOSE:To enable restraint of overshoot of pipe voltage wave shape and oscillation when high tension cable length is different by controlling resistance value and operating time of a variable resistance means provided between a DC transforming means and a DC-AC converting means. CONSTITUTION:A pipe voltage signal Ekv, a pipe current signal EmA and a signal Ec corresponding to high tension cable length are input into a control condition calculating circuit 34. The circuit 34 computes the optimum damping resistance value to restrain oscillation of pipe voltage and insertion time there of by signals Ekv, EmA and Ec and outputs corresponding signals ER, ET to monomultiplexors 35, 36 respectively. The output of the monomultiplexor 35 shows a time ratio giving optimum damping resistance value to a variable resistance means 62 and the output of the monomultiplexor 36 is synchronized with output AC voltage of a DC-AC converting means 63 to determine optimum time width when damping resistance value is inserted. |
