Abstract
A Short History of High Voltage Direct Current Cables and Space Charge Measurements at Delft University of Technology
Highlights
In this paper, a chronological description of the developments in the field of high-voltage direct current (HVDC) insulation, which took place at Delft University of Technology’s highvoltage laboratory, is given
The importance of space charge accumulation became clear, especially under voltage polarity reversal conditions. This led to the introduction of the pulsed electroacoustic (PEA) method developed by Professor Tatsuo Takada’s group, which allowed nondestructive measurements to be made.[1]. Initially used on mass-impregnated paper cables and later on polymeric systems, the PEA method has led to an enormous improvement in the understanding of charge dynamics especially in polymeric systems
There is no doubt that the design and development of polymeric cables for HVDC received an incredible boost by the introduction of nondestructive space charge measurement techniques such as PEA
Summary
Solid Dielectric Solutions, Herensteeg 17, 2311 SG Leiden, The Netherlands (Received December 12, 2016; accepted March 27, 2017). In the early 1990s, Professor Kreuger led the high-voltage laboratory and one of his mottos was “DC does not exist”. This was used to motivate the students and make them aware of the fact that many different operating conditions are present under DC. While a number of polarization and charging processes can be modelled, a more precise picture of the electric field distribution under different operating conditions is obtained by space charge measurements. This information is essential in the design process. For cable systems in operation, the proper knowledge of the electric and thermal stress distributions allows these systems to be operated more reliably and economically
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