For the RLC Network Program PSpice
Manufacturers and operators of electrical devices and installations are often faced with the problem of evaluating and improving their products. Regardless of whether they are employed in the generation and transmission of electrical energy, in the production of goods or in individual households, the devices and plants have to become even more compact and efficient. The frame size of electrotechnical equipment is mainly determined by the temperature distribution inside the devices and installations.
In the companies that manufacture electrical equipment, the thermal design of the product is determined during product development. If not sufficiently careful and well-founded procedures are followed, the actually achieved ampacity of the product falls short of the one that could be achieved. Valueable capacities of raw and refined materials are thus not exhausted. For all companies that want to assert themselves on the market with quality, however, it is necessary to develop precisely these reserves as a competitive advantage. With the help of a thermal calculation model, the critical temperatures within an electrical device can be determined depending on its geometric measurements, the qualities of the materials used and the loss due to current and environmental influences. Tests are virtually not required.
Falling back upon researches done by the Institute of High Voltage and High Current Engineering at Dresden University of Technology, THETA has developed a thermal network library that is based on the thermal network method. The library enables its users to achieve the desired result within a short period of time and without spending extraordinary much money. Thus it relieves the manufacturers and users of electrical devices and installations of the time-and-money-consuming way of experimenting and applying other methods of calculation than the thermal calculation model. The thermal calculation model emulates heat transfer processes analogeously to an electrical network.
With its help, a wide range of products standing out due to both a high current-carrying capacity and a compact design has been developed. Among other things, the temperature distributions of very large transformers, distribution transformers in compact stations, high-breaking-capacity fuses and gas-insulated medium-and-high-voltage switchgear at different load currents and under different environmental conditions were simulated.