ContentsPart I Fundamentals and Applications of Q{t) Method1 Classification of Charge Accumulation Measurement 31.1 The Progress of Space Charge Measurement Technology 31.2 Q(t) Method Can Measure Charges in All Trap Levels 61.3 PEA Method is Difficult to Measure Shallow Trapped Charge 71.4 Explanation of Current Terms 9Appendix 1.1 Pico-ammeter Measurement 12Appendix 1.2 Precautions for Guard Ring Electrode and Pair Diode 13Appendix 1.3 Noise Comparison Between pA Method and Q(t) Method 15Appendix 1.4 Measurement of Electric Field Intensity E(0，t) at Electrode Surface 17References 182 Fundamentals of Q(t) Measurement 212.1 Q(t) Meter Circuit Configuration 212.2 Q{t) Meter Measurement on High Voltage Side 222.3 Selection of Capacitance of Integration Capacitor 262.4 Stability of Q(t) System 262.5 Consideration of Stray Capacitance 292.6 Q(t) Method Applied Under High Temperature and High Voltage 31Reference 333 Evaluation of Charge Accumulation 353.1 Evaluation of Charge Accumulation by Charge Ratio Q(t)/Qo 353.2 Relationship Between Relaxation Time t and Measurement Time tm 393.3 Space Charge Formation and Q(t) Simulation 463.4 Combination of PEA Measurement and Q{t) Measurement 51References 554 Q(t) Data of Various Polymer Materials 574.1 Q(t) Characteristics of Various Polymers .574.2 Classification of Charge Accumulation Characteristics 574.3 Charge Accumulation Characteristics and Molecular Structure 584.4 Relationship Between Charge Accumulation and Electrostatic Potential Distribution in Molecule 674.5 Improvement of Charge Accumulation Characteristics of XLPE + Voltage Stabilizer 68Reference 725 Charge Accumulation in Inorganic Materials 735.1 Q(t) Data of Inorganic Materials 735.2 Electric Field Dependence and Temperature Dependence 755.3 DC Permittivity 785.4 Comparison of Q(t) Data Between Polymer Insulating Materials and Inorganic Materials 805.5 Multilayer Ceramic Capacitors 805.6 Research Subjects 86Reference 936 Application to Insulation Diagnosis 956.1 Charge Accumulation Evaluation by Q(t) Method on High Voltage Side 956.2 Coaxial Cable with Temperature Rise 1006.3 Charge Accumulation Characteristics of DC-XLPE Cable 1036.4 Insulation Diagnosis After Gamma Irradiation 1046.5 Diagnosis of CV Cable After Accelerated Water-Tree Deterioration 1066.6 Q(t) Measurement is Strongly Against External Noise 1106.7 Double-Layer Dielectric Interface 1156.8 Evaluation of Charge Accumulation in Power Devices 1176.9 Electrical Tree 1216.10 Measurement of Two-Dimensional Current Distribution 1266.11 Q(t) Measurement of Enameled Wire Insulation 127References 130Part II Fundamentals and Application of Pulsed Electro-Acoustic Method7 DC Insulation and Space Charge Accumulation 1337.1 Measurement of Space Charge Distribution by PEA Method 1337.2 DC Insulation and AC Insulation 1357.3 Accumulated Charge and Internal Electric Field 1367.4 Dielectric Deterioration and Breakdown Caused by Accumulated Electric Charge 139References 1418 PEA Method: Pulsed Electro-Acoustic Method 1438.1 Pulse Pressure Wave of PEA Method 1438.2 Signal Processing 1469 Generation of Pulse Pressure Wave 1539.1 Generation of Pulse Pressure Wave from ElectrodeInduced Charge 1539.2 Generation of Pressure Wave from Space Charge 1559.3 Generation of Pressure Wave from Polarized Charge 15810 Basics of Electrodynamics and Elastic Mechanics 16110.1 Basic Piezoelectric Formula 16110.2 Local Hooke’s Law and Dynamic Hooke’s Law 16410.3 Explanation of Convolution Integral 16410.4 Expansion of Dielectric Material Under Applied Electric Fields-Force Acting on Polarized Charge 16910.5 Fourier Transform 17110.6 Gaussian Filter 17410.7 Charged Elastic Body 176Reference 177Examples of PEA Measurement Results 17911.1 Accumulation of Homo and Hetero Charges 17911.2 Frequency Dependence of Space Charge Accumulation 18011.3 Charge Accumulation in a Double-Layer Dielectric 18211.4 Effect of MgO Addition for Blocking Space Charge 18511.5 Charge Accumulation Inside Coaxial Cables 18711.6 Distribution of Accumulated Charge in the Cross Section of the Coaxial Cable 18911.7 Space Charge Measurement of Long Cables 19011.8 Light Irradiation and Space Charge Formation 19211.9 Electron Beam Irradiation and Space Charge Formation 19311.10 Gamma Irradiation and Space Charge Formation 19511.11 Proton Irradiation and Space Charge Formation 19611.12 Comparison of Paraelectric and Ferroelectric PEA Signals 19811.3 3D Measurement Results of Charge Distribution 20111.14 Generation and Recovery of Attenuation and Dispersion of Pressure Wave 202References 212Part Ⅲ Utilization of Quantum Chemical Calculation Analysis12 Basics of Quantum Chemical Calculation 21712.1 Terms in the Electron Energy Level Diagram 21712.2 Atomic and Molecular Orbitals 21912.3 Diagram of Electron Energy Level 22212.4 Mulliken Atomic Charges and Electrostatic Potential Distribution 22412.5 Chemical