Abstract Water leakage of the insulation sheath can lead to a decrease in performance power cable, which poses hidden danger cable. Accurate detection and positioning water area are crucial for improving safety stability. In response defect cable sheath, this article proposes method based on reflective terahertz time-of-flight tomography technology measure sheath. A sample was prepared by simul...

The backfill materials around under-ground power cables affect the maximum current carrying capacity of these cables. Usually backfill soils around under-ground power cables lose their moisture content, forming dry zones around the cables and leading to an increase in the thermal resistance and decreasing in maximum current carrying capacity. But according to the results of the experimental wor...

The new heavy ion synchrotron facility proposed by GSI will have two superconducting magnet rings in the same tunnel, with rigidities of 200 T m and 100 T m. Fast ramp times are needed, which can cause significant problems for the magnets, particularly in the areas of ac loss and field distortion. This paper discusses the 200 T m ring, which will use Cos magnets based on the RHIC dipole design....

Preliminary notes This paper addresses some shortcomings of existing IEC standards related to analyses of cable systems with polymer insulation (IEC 60840 and IEC 62067). The focus is on partial discharges measurement, completely neglected in present version of these standards, and justification of the needs for their inclusion in the standards through appropriate procedures. If included in the...

Partial discharge (PD) events happen inside the power cables and cable terminations with the insulation degradation. The PD detection can effectively supply the information of cable status. According to the electrical and electromagnetic emission of PD activities, high-frequency transformer (HFCT) and ultrahigh-frequency (UHF) methods are employed to detect the PD signals. Besides, a portable P...

Currently, the development trends of global medium voltage cable networks are aimed at introduction cables with cross-linked polyethylene insulation. Such have a higher operating temperature, which allows to increase their throughput, and increased stability when working in conditions overload short circuits. It is possible determine allowable heat electrical loads only if balance observed. Fun...

CE/SC : 21, Publié/Published : 1968, Session paper, Ref. No. : 21-00, Special Report for Group 21. CE/SC : 21, Publié/Published : 1968, Session paper, Ref. No. : 21-06, Some Observations upon Distributions of Partial Discharge Pulses Measured with a Multi-Channel Analyser. CE/SC : 21, Publié/Published : 1968, Session paper, Ref. No. : 21-05, 200 kV D.C. Submarine Cable Interconnection between S...

Incorporating positive temperature coefficient (PTC) ceramic particles into polymers provides a prospective alternative solution for suppressing severe electric field distortions caused by negative (NTC) of electrical resistivity within polymer insulation in high voltage direct current cable. The effect the Curie PTC on inhibition NTC cross-linked polyethylene (XLPE) is investigated this study....