The short-circuit switch in the smaller cabinet of the test system simulates unintentional short-circuits. It is designed for very high currents; for a short time it can carry up to 45,000 amperes, even several times in succession. Placing it in a separate housing has the advantage that the connection paths to the test object, i.e. to the battery system, can be kept very short and thus higher contact resistances can be avoided. In addition, the switch is designed for an extended temperature range so that it can also be operated in a climatic chamber.
The measuring equipment, on the other hand, can be operated in a safe environment several metres away from the short-circuit breaker and the battery system. „After all, there is always the residual risk that the battery will explode if the fuse elements do not respond quickly enough," says Smart Testsolutions Managing Director Wolfgang Neu. The system measures voltage and current curves at various points in the battery system - and does so with high precision and very quickly, the company promises. After all, measurements have to be taken at the speed at which the fuse trips, which is only a few milliseconds. The system has a total of 16 high-resolution analogue measuring channels.
Another special feature of the system is that it can measure the short-circuit currents both resistively and via a Rogowski coil. Users therefore can optimally record both the dynamic and static behaviour. For this purpose, a very powerful and very accurate measuring shunt was integrated into the short-circuit test system.