High currents require extra protection devices. Thinking about luxury and upper class automobiles, currents up to 800A for the initial motor startup are necessary. Everybody can imagine, in which dimensions a simulation system for automotive supply networks has to be.
Taking a fully equipped modern limousine as an example, many different power consuming units are on board. Motoric devices as well as high speed heating systems for front windows and lots of other appliances. All of them require immediately high currents for their desired operation.
At the prototyping cycle of current cars in in-house testing facilities (according to ISO 7637 and lots of manufacturer specific test regulations) a programmable DC power supply source with a very high current capability, very short rise time (+/-), very low internal resistance and a very high peak power capability is absolutely necessary.
A well-known representative of such a voltage source is the PAS 15000 GN/Kfz, able to deliver short time currents far above 1000A. With such a simulator devices with high-energy needs can be tested also.
During any test run the protection of the (mostly expensive) prototype against overvoltage must be most important.