and Heating of Electrical Devices
Target:
Developer and designing engineers of switchgears and equipment in the field of low, medium and high voltage technonogy are introduced into a method, with which they can dimension their equipment in terms of material input, current carrying capacity and heating. It will be shown, how thermal weak spots in the design can be easily detected and eliminated in the construction without ahving to carry out effortful development testings. The possible current carrying capacity can be calculated depending on the environmental conditions, the permissible temperature of the current path, the design of the surfaces of the current path and the insulation, the encapsulation and the load by the power of the sun and sky radiation at outdoor devices. The designers and installers of the plants of electrical power systems are introduced to a method and a program with which they can optimally dimension the current path of the plants depending on the requirements of the customer with regard to environmental conditions and current load. This enables the operators to mak ereliable dscisions on the current load of the plants, which is possible at this moment, depending on the environmental conditions and the preloading of the plants without exceeding limit temperatures. By using the thermal network method, time-consuming and costly heating tests can be reduced to a minimum or even saved.
Content:
-
introduction to the problems of the current carrying capacity and warming of an electrical equipment
-
calculation of the current carrying capacity of a infinete long and homogeneous conductor with the heat balance equation (e.g. cables, busbats, overhead line)
-
calculation of the rated current carrying capacity
-
calculation of the short current carrying capacity
-
calculation of the curryent carrying capacity with the thermal network method
-
construction of thermal networks for different equipment
-
construction of thermal networks for equipment in low, medium and high voltage engineering