Condition Assessment of Water in High viscosity Insulating Cable Termination Oil

Oil-filled terminations for high voltage XLPE insulated cables have been used for four decades in the Netherlands with a good service record. Prysmian would like to gain better insight into the effects of water contamination in insulating oil, to further extend the in-house experience and potential related failure mechanisms. High voltage...

Design and development of a 72 kV cable Y-joint with integrated PD sensor for offshore wind turbine grid connections

The recent developments in the offshore wind industry are pushing towards upgrading the inter-array voltage level from 33 kV to 66 kV. The main reason behind this, is the increased capacity of future wind turbines leading to an increased power density in the inter-array grid of the offshore wind farms. The current level of 33 kV cannot give cost...

Influence of Moisture in Insulating Paper on Reducing Post-impregnation Standing Time of Oil-filled Power Transformers

Standing time, prior to testing, is a necessary part of the oil-filled transformer manufacturing process and its duration is design dependent. Caution on part of the manufacturer to avoid failure of expensive transformers leads to the overestimation of standing time, consequently impacting annual production. Thus, a need for optimizing (reducing...

Power transformers: Influence of moisture in pressboard insulation on standing time

A large power transformer, is often, a custom designed equipment that entails a complex and capital intensive manufacturing process. It is an integral part of the power system and the cost of failure during service can be significant. Due to its importance in the power system, transformers should perform reliably under the conditions for which...

Diagnostics of On-Load Tap Changer Using Dynamic Resistance Measurement Technique

Power transformers are valuable assets in the power network, and have as the primary function to regulate the transmission and distribution voltage. A large amount of capital is required to manufacture, transport, install and maintain them. As the load in the network changes, the voltage needs to be regulated. Load change is the result of demand...

Design of a Partial Discharge Test Platform

Design of a Partial Discharge Test Platform author: Daniel Harmsen thesis advisor (mentor): Dr. Armando Rodrigo Mor abstract: Partial discharge (PD) measurements are an effective tool for insulation diagnostics and assessment. Therefore, a good understanding of these PD measurements is an essential part of an electrical engineer’s background...

AC Electrical Breakdown Strength of Solid Solid Interfaces: A study about the effect of elasticity, pressure and interface conditions

In several electrical insulation components, such as cable connectors, joints and penetrators, various solid insulating materials are usually brought in contact, forming interfaces. The dielectric strength of these solid$|$solid interfaces is critical for the strength of the overall system. Especially in cases that the applied field has a...

Partial Discharge Analysis and Recognition in Cables with Medium Voltage DC

With the current state of power electronic conversion operating at Direct Current (DC) can in some cases be more efficient than ordinary Alternating Current (AC). DC voltage energy transmission and distribution is, thus, playing an increasingly important role. The continuity of the electrical energy supply is essential for a well-functioning...

Magnetic and Induced Electric Field Management for Underground cable Installation: Calculations, analysis and Design Optimization

The international growing concern for the human exposure to magnetic fields generated by electric power lines has unavoidably led to imposing legal limits. The world health organization sets limits for exposure to magnetic and induced electric fields. Basically, the world health organization references to the guidelines provided by the...

Partial Discharge Recognition of Defects in Gas Insulated Systems under DC Voltage

The thesis consists of 7 chapters. The first chapter will explain the background, motivations and the general overview of the thesis. Chapter 2 is a literature review describing the physics behind the creation of PDs. The conditions necessary for the occurrence of PDs are covered in addition to an analysis of the different types of PD in GIS...

Comparison of measurement methods for partial discharge measurement in power cables

Nowadays there are many partial discharge (PD) measurement systems on the market. There are systems that measure according to the IEC60270 standard (conventional measurement) and systems that don’t, the so called ‘’unconventional measurement systems’’. For PD measurement in power cables, measurement according to the standard has some...

Control and Protection of VSC-based Multi-terminal DC Networks

The increasing global energy needs and the high integration of renewable energy generation have changed the requirements for the electricity grid. Countries are becoming unable to cover their energy demands with their own means and the need for power exchange between neighboring countries has increased. Consequently, power needs to be...