| 摘要 |
PURPOSE:To protect a superconducting coil quickly by providing a single pole power supply to be connected across the superconducting coil through a disconnector, another power supply to be connected in parallel with the superconducting coil, and at least one protective resistor and a circuit opening means thereby eliminating a power switch for continuously feeding a large current. CONSTITUTION:A disconnector DS is normally closed to feed power from a single pole power supply E1 to a superconducting coil L thus exciting the superconducting coil L. Immediately upon quenching of the superconducting coil L, a first ON switch SW1 is closed to bring the voltage of the single pole power supply E1 to zero. Consequently, a thyristor Th is closed to bring the current of the power supply E1 quickly to zero. Current of the superconducting coil L is thereby commutated automatically to SW1-Ly-F. When the fuse F is blown out by the current commutated thereto, the current is interrupted and commutated to a protective resistor Rd1 which absorbs magnetic energy of the superconducting coil L thus protecting the superconducting coil L. |
