K.I. Nikiforov - Ph.D. (Eng.), Associate Professor, Chair of Electric and Electronic Equipment, Chuvash state University (Cheboksaru, Russia). E-mail: igorkronidovich@mail.ru
T.A. Ayupov - Ph.D. (Eng.), Associate Professor, Chair Nanotechnology in electronics, Kazan National Research Technical University named after A.N.Tupolev (KNRTU-KAI). E-mail: aypov_t@mail.ru
R.R. Faizullin - Dr.Sc. (Eng.), Professor, Head of Chair Nanotechnology in electronics, Kazan National Research Technical University named after A.N.Tupolev (KNRTU-KAI). E-mail: rrfayzullin@kai.ru
Y.K. Evdokimov - Dr.Sc. (Eng.), Professor, Head of Chair Radioelectronics and Information Measurement Equipment, Kazan National Research Technical University named after A.N.Tupolev (KNRTU-KAI). E-mail:evdokimov.riit@kstu-kai.ru

Performance TM, used in oil-filled power engineering systems, must meet certain requirements: high dielectric strength, high resistance to thermal, electric fields and processes of oxidation; fire safety, ecological safety, high heat capacity and low viscosity at the operating temperature range. However, as noted in [1] none of the dielectric liquid does not meet all of these requirements simultaneously also over time, these parameters are changed so the challenge remained operational control operational properties of TM. At the present time to study the properties of liquid petroleum products and, in particular TM, using modern physical and physical-chemical methods of diffraction and thermodynamic, dielectric, acoustic, Rayleigh spectroscopy, IR and UV - spectroscopy, spectroscopy, nuclear resonance (NMR and EPR), etc. Existing analytical devices of diagnostics of TM developed on the basis of these methods have their advantages and disadvantages, mainly considerable weight and dimension parameters, measurement duration and high cost. Modern and innovative trends in the development of techniques require a search for new approaches, which saves time and material resources, and to facilitate their exploitation for staff. Within the topic of this article, these tasks can be performed by the methods of electrophysical diagnostics (specifically dielectric spectroscopy), allowing to study the interaction of electromagnetic field with substances and environments in a wide range of frequencies (including terahertz range) and allows you to accurately determine their properties, composition and structure [5]. Experimental studies were performed samples TM using the vector analyzer electrical circuits "ZVA67" production firm "RODHE&SCHWARZ", set coaxial probes and software "Speag", designed for measurements in the frequency range of 0.01 to 20 GHz in the temperature range 0...+60 ºC. Analysis of the experimentally obtained graphics dielectric spectra of transformer oil reveals that the behavior of curves, are unique changes on some frequency stations, which proves the possibility of using the specified method dielectric spectroscopy for routine laboratory monitoring and Express-analysis "state worker" or degradation of transformer oils. During research it is planned to develop the experimental sample of microprocessor systems of control and diagnostics of liquid oil products, in particular TM.