тангенс кута діелектричних втрат тангенс угла диэлектрических потерь 4 dielectric loss tangent 2 621.314 1 621.315.2 1 621.319 1 XLPE-cable 1 aggregate measurements 1 aging of paper impregnated insulation 1 aluminum nitride 1 commutation matrix 1 current transformer 1 data processing procedure 1 diagnostics 1 dielectric loss 1 dielectric loss angle tangent 1 dielectric permittivity 1 electric field structure 1 high voltage insulation 1 insulation losses 1 insulation system 1 loss factor 1 low molecular weight substances 1 moisturizing cables 1 molybdenum 1 multi-core cables of nuclear power plants 1 phase and belt insulation 1 power cable 1 power cables 1 probing electric field 1