DESIGN, CONSTRUCTION AND COMMISSIONING OF SGPR, THE FAST PROTECTION SYSTEM OF RFX

RFX, the largest machine for magnetic confinement of plasmas in the RF P line, is provided with a system named SGPR specifically designed for the machine global protection against fast faults which can develop i n the plasma, in the windings, in the power supply circuits and in the control system. SGPR is a cabled logic HLL machine, able to organise in few tens of microseconds coordinated machine protection, dealing wi th more than forty fault signals and activating almost thirty protecti on commands. SGPR design, manufacture and test program conform the qua lity control criteria necessary to assure the required high reliabilit y. After a careful and cumbersome commissioning work the system has as sumed its protection role. Up to now it has been called to a number of interventions which, even if never due to major faults, have shown it s capability of proper operation.