Two questions concerning the GOST IEC 60079-14 requirements are considered. The first one is about the operating voltages of spark-proof electric circuits in general and spark-proof cables in particular. The second question is about the rating of capacitance, inductance and the relationship between inductance and electrical resistance in cables for spark-proof explosion protection systems. As follows from the analysis it is necessary to develop two standards: the first one specifying the requirements to be applied in all types of explosion protection systems and intended for all types of cables installed in explosion hazard areas of all classes; the other standard of «General Technical Specifications» type shall state the requirements for the installation cables used in explosion hazard areas. It is recommended to select the wide range of СКАБ cables as basic construction for the «General Technical Specifications» standard.
M.S. Demin, Cand. Sc. (Physics and Mathematics), Assistant Professor;
T.F. Morozova, Cand. Sc. (Physics and Mathematics), Assistant Professor;
Northern-Caucasian Federal University, Department of Automated Electric Energy
Systems and Power Supply of Engineering Institute
About the neutral wire operation mode in distribution networks made up of 10 kv XLPE cables
Properties of cross-linked polyethylene and technology of its production are analyzed. Prospective application of treeing- resistant cross-linked polyethylene as insulating material with high performance properties is shown.
Specific aspects of XLPE cable functioning with different neutral wire operation modes are considered. Analysis of normative documentation and research papers dealing with the use of XLPE cables in medium-voltage distribution networks was performed and contradictory requirements for such cables were pointed out. Recommendations are given concerning the neutral wire operation modes when XLPE cables are used in 10 kV distribution network.
neutral wire operation modes; XLPE cables; single phase-to ground fault; silane cross-linking; peroxide cross-linking; treeing.
M.A. Boev, Dr. Sc. (Engineering), Professor National Research University
«Moscow Power Engineering Institute»;
Ye Naing Lin, post-graduate student National Research University
«Moscow Power Engineering Institute», FTEMK DepartmentG
Climatic and mechanical properties of drop cables
Technologies of a distribution network of optical drop cables which are designed for installation in multi dwelling units in urban areas are analyzed. OBHBLS-HF drop cables with optical micromodules and ОПЦ-Д2 drop cables with a central module used for installation with the help of the Verti Casa system offered by the Prysmian Group are considered. Mechanical tests of the cables were performed using the РРК-ЕК2 type tensile and crushing machine. Climatic tests were carried out in the Angelantoni Challenge СН1200С chamber. In the course of testing the attenuation increment dependences on the tensile and crushing strength values, as well as on the temperature, were obtained.
optical drop cable; FTTH (Fiber-To-The-Home); passive optical network; optical micromodules (OMM); talc spreader.