Overhead contact system is a part of electric traction network which doesn’t have safety margin of a construction that’s why its using in winter becomes much difficult. The most heavy overhead contact system work is the operating regime in wind and ice loading because of wind and increasing not only on wires and suspension strands but on supporting structures. Ice loading on wires makes current-collecting conditions much worse and taking into account operational factors it can be a cause of a traffic accident and trains stop. The authors examine some methods of ice prevention, their efficiency effect and the capacity of their combining. In connection with this it is very important to trace ice load as early as possible. Equipment set for thermodynamic method instantiation and its fixing variant are represented.

Keywords: traction power system, overhead contact system, contact wire line, ice loading, loading, testing methods

The model of reactive power compensation system calculation in industrial enterprises and power systems electric networks is developed. The authors take into account three main problems: multidimensionality, informational fragmentation and incompleteness of information. The quadratic model of  reactive power compensation is examined. The calculation method main phases which uses all the advantages of quadratic model and methods of its improvement are given.

Keywords: compensating devices, reactive power compensation, power system, industrial enterprises electric networks, quadratic model, mathematical model, incompleteness of information