ELECTRICAL LOSS-DEPENDENT THERMAL SIMULATOR CIRCUIT OF AN ELECTRICAL OPERATING MEANS SUCH AS ELECTRIC MOTORS AND TRANSFORMERS

摘要

An electrical loss-dependent thermal simulation or simulator circuit of an electrical operating device, the circuit incorporating at least two RC-elements, by means of the capacitors and resistors of which there are determined the thermal capacity of the operating means and its heat transfer resistance. The resistors of the RC-element are electrically connected together into a two-pole resistance network and by means of the charging operation of the capacitors there is simulated the heating behavior of the operating device. There is provided switch circuit which can be connected by a switch mechanism with the resistance network, such switch means increasing the virtual impedance of the resistance network, and further wherein the RC-elements can be switched, by actuating the switch mechanism, from a predetermined time-constant, with switched-off switch means, to a larger time-constant, with switched-on switch means, and vice versa.