Back to Search
Start Over
Influence of void defects on partial discharge behavior of superconducting busbar insulation
- Source :
- Fusion Engineering and Design. 119:29-34
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- For a magnetic confinement fusion device, the superconducting magnets and busbars need to be insulated with one layer of solid insulation to isolate the high voltage potential from the ground. The insulation layer commonly consists of several interleaved layers of epoxy resin-impregnated glass fiber tapes and polyimide films. The traditional electrical inspection methods for such solidified insulation on the magnet and busbar are a DC voltage test or a Paschen test. These tests measure the quality of the insulation based on the value of leakage currents. However, even if there is a larger quantity of high dielectric strength material implemented, if there are some microcavities or delaminations in the insulation system, the leakage current may be limited to microampere levels under testing levels over dozens of kilovolts. Therefore, it is difficult to judge the insulation quality just by the magnitudes of leakage current. Under long-term operation, such imperceptible defects will worsen and finally completely break down the insulation because of partial discharge (PD) incidents. Therefore, a PD detection test is an important complement to the DC voltage and Paschen tests for magnet and busbar insulations in the field of fusion. It is known that the PD detection test is a mature technique in the electric power industry. In this paper, the PD characteristics of samples containing glass fiber-reinforced composite insulations for use with the superconducting busbar were presented and discussed. Various samples with different void contents were prepared and the PD behaviors were tested.
- Subjects :
- Materials science
Dielectric strength
Busbar
Mechanical Engineering
Glass fiber
High voltage
Superconducting magnet
01 natural sciences
010305 fluids & plasmas
Nuclear Energy and Engineering
Insulation system
0103 physical sciences
Partial discharge
General Materials Science
Composite material
010306 general physics
Civil and Structural Engineering
Leakage (electronics)
Subjects
Details
- ISSN :
- 09203796
- Volume :
- 119
- Database :
- OpenAIRE
- Journal :
- Fusion Engineering and Design
- Accession number :
- edsair.doi...........3d633cb97749308894a0fd0de201d783