| Abstract |
The low voltage electromechanical circuit breakers have attained a certain maturity over the last few years. The requirements of the end user are new and correspond to very precise needs: ideal breaking capability with overvoltage control, better discrimination, absence of wear and maintenance and possibility to predetermine performance of the equipment for protection. The association of the fuse, the electromechanical circuit breaker and the thermal relay necessary to cover all bands of protection tor the equipment, between the initial instant and continuous running, has no langer to take place with static protection devices. The intrinsic qualities of control and rapidity of the power semiconductor make it used more and more as the breaking medium in the perfecting of new static protection devices. In this article the authors present the breaking medium for a static protection device with a high breaking capacity (greater than 50 kA). The original choice retains from the time of conception of the static limiting device, some nominal characteristics, 660 volts, 100 amperes, presented and justified. The solution retained consists of putting in parallel some bidirectional static switching modules characterized by a commutable current of 100 A. |
