Nowadays, the research in the sphere of high-voltage cable network of high frequency is a pressing issue [1; 2; 3]. The article summarizes the results of the research and announces the new perspectives of work.
The high-frequency power transformer (HFPT) and the semiconductor voltage converter (SVC) are important elements of the network under study. The construction of SVC is based on the IGBT (Insulated-Gate Bipolar Transistor). The converter operates in the frequency range from 10 to 20 kHz. It was experimentally established that the efficiency of SVC is quite large (98.5 %) .
The transformer consists of two windings and a ferrite magnetic core. The coils are insulated from each other as well as from the core. The secondary winding (SW) is wound on the top of the primary winding (PW). Importantly, the highvoltage winding (SW) is divided into five sections which are connected to each other in series. More detail of transformer design can be found in “Method for Determining the Electrical Parameters of the Equivalent Circuit of High Frequency Transformer” . The basic technical characteristics of HFPT are presented below (Table 1).
Table 1. Technical characteristics of HFPT
|Rated frequency||13 kHz|
|Nominal primary voltage||250 V|
|Nominal secondary voltage||1,250 V|
To simulate the processes occurring in the windings of HFPT, it is necessary to know the parameters of the transformer. For this, the method for determining of the transformer electrical parameters has been developed [5,6]. In order to analyze the electrical stresses in the transformer, the electromagnetic stress distribution inside the high-voltage winding has been received .
High-voltage cable network of high frequency can be used for power supply of the industrial enterprises. Therefore, a mathematical model of a distribution cable network has been developed . This model is based on the methods of frequency analysis and the Fourier transform. The program allows to regulate the number of cables, their length, parameters of energy consumers.
Thus, according to the research results, we can formulate the new avenues of the cable networks of high frequency work:
- the design of the transformer should be improved in order to increase power;
- for the proper evaluation of the developed models the creation of an experimental model of the distributed cable network is required.