Space Charge Pulsed Electro Acoustic Method, Calibration for Flat Samples and Crosstalk Reduction for HVDC Cable Measurements

The Pulsed Electro Acoustic Method (PEA) is a widely used method for the measurement of space charges in High Voltage (HV) dielectrics. This thesis aims to contribute to the optimization of the PEA method by being able to make measurements from different test setups comparable and enhance the reliability of the results interpretation. This work...

Pea electromagnetic distortion reduction by impedance grounding and pulsed voltage electrode configurations

Space charges are one of the main challenges facing the constantly increasing use of extruded high voltage direct current (HVDC) cables. The Pulsed Electro-Acoustic (PEA) method is one of the most common procedures for space charge measurements of insulation. One issue with the PEA method is distortion due to the crosstalk between the applied...

Influence of the pulse voltage injection configuration on the electromagnetic distortion in space charge measurements using the PEA method

The Pulsed Electroacoustic Method is one of the most common methods for space charge measurements in solid dielectrics. This method involves applying a voltage pulse across the dielectric under test, which modifies the electrostatic force balance across the dielectric, creating an acoustic signal that can be measured externally. This work...

Towards Understanding Afghanistan Pea Symbiotic Phenotype Through the Molecular Modeling of the Interaction Between LykX-Sym10 Receptor Heterodimer and Nod Factors

The difference in symbiotic specificity between peas of Afghanistan and European phenotypes was investigated using molecular modeling. Considering segregating amino acid polymorphism, we examined interactions of pea LykX-Sym10 receptor heterodimers with four forms of Nodulation factor (NF) that varied in natural decorations (acetylation and...

PEA Method Space Charge Measurement, modeling & measurement of applied pulsed-voltage in different setups for MV mini-cable

Destructive consequences of trapped space charges within HVDC coaxial cable insulation, such as accelerated aging, degradation, and breakdown, are some of the most significant challenges that manufacturers and users usually come up with. Pulsed Electro-Acoustic (PEA) method is a widely-used method for space charge detection and measurement, in...

Influence of the Pulsed Voltage Connection on the Electromagnetic Distortion in Full-Size HVDC Cable PEA Measurements

Nowadays, with the widespread use of High Voltage Direct Current (HVDC) cables in power systems, the measurements of space charges in full-size cables are becoming more relevant. One of the most common methods used for space charge measurements is the Pulsed Electro-Acoustic (PEA) method. This paper analyzes two factors that influence the...

A Calibration Method for Acoustic Space Charge Measurements Using Multilayer Samples

Nowadays, the use of several methods for the measurement of space charges in dielectrics has become more relevant. The availability of different space charge measurement methods brings the necessity of calibration and characterization of measurement equipment to reach standardized measurements. In this paper, a method is presented to apply known...

Electrical characterization of polymeric DC mini-cables by means of space charge and conduction current measurements

The world’s first commercial High Voltage Direct Current (HVDC) transmission link was built in 1954 between the Swedish mainland and the island of Gotland. At that time, it was proved that HVDC transmission is technically feasible. Since then, HVDC cable systems have been used worldwide in electrical energy transportation. Most HVDC...

Investigation of space charge injection, conduction and trapping mechanisms in polymeric HVDC mini-cables

Polymeric insulation materials have not been used in HVDC cable systems until recently. The main cause of this being the tendency of polymers to deplete accumulated charge very slowly. Research into the dynamics of space charge trapping, injection and conduction in polymers can reveal important information from which new materials can be...

Space charge accumulation in polymeric high voltage DC cable systems

One of the intrinsic properties of the polymeric high voltage (HV) direct current (DC) cable insulation is the accumulation of electrostatic charges. Accumulated charges distort the initial Laplacian distribution of the electric field, leading to a local field enhancement that may cause insulation degradation and premature breakdown of the...