Cables comparison

Tests on Cable Constructions. The Association of Edison Illumination Companies (AEIC) has approved an accelerated cable hfe test in which typical underground distribution power cables can be statistically compared based on their resistance to water treeing (number of days to fail). The comparison can be made by varying the type of insulation and/or other cable layers in an environment that contains hot water (90°C) under 8V/fi (200 V/mil) voltage stresses (four times the typical power cables operating voltages). 

Union Carbide Corp., Kabelitems Wire and Cables No. 157, A. Critical Comparison ofXEPE andEPR for use as Electrical Insulation on Underground Power Cables, Danbury, Conn. 

The choice of any of the cables mentioned in Table A16.1 w ill depend upon the site conditions, fault level and the voltage rating of the system. A brief comparison of all these insulating systems is given in Table A16.2... 

Table 16.6 Comparison of parameters for 1900/3300 V XLPE insulated, armoured, three-core cable...

Table 16.7 Comparison of full-load capabilities for paper, PVC and XLPE insulated copper cable...

Comparison of Radiation and Peroxide Cross-Linking of Wire and Cable Insulation Materials... 

Figure 29.9 shows a comparison between the components of a rudimentary EPR spectrometer and the corresponding elements of a more familiar apparatus for visible spectrometry. In EPR, the source of excitation radiation is a microwave device called a klystron. The microwaves would disperse in free space and must therefore be conducted to the sample by waveguide or coaxial cable. The sample, contained in the sample tube, is held in a microwave cavity between the poles of a magnet. The detector is usually a diode that produces a dc output propor-... 

Fig. 10. Photon arrival time statistics of single emitters, (a) Schematic description of the temporal structure of single-emitter emission, (b) Simulated timetraces for different intersystem crossing rates as indicated, (c) Start-stop measurement yielding and anticorrelation, so called antibunching, at zero delay (the offset is due to different lengths of cables for both detectors), (d) Same measurement for pulsed excitation. Thick line Single emitter with missing peak at zero time delay. Thin line scattered laser light signal for comparison.

Fiber optic cables are especially suited for high speed data transmission. The new FDDI ( Fiber Distributed Data Interconnect ) standard specifies a transmission rate of 100 Mbits/s. The comparison between the Ethernet and FDDI standards are given in Table 9.3. 

Richter, S. and Schmidt, R., Testing of cables designed for fire resistance, A comparison of U.S. and European standards, Proceedings of 46th International Wire and Cable Symposium, Philadelphia, PA, 1997, pp. 752-760. 

Hirschler, M.M. and Grand, A.F., Comparison of the smoke toxicity of four vinyl wire and cable compounds using different test methods Fire Mater., 1993, 17, 79-90. 

Hull, T.R., Lebek, K., Pezzani, M., and Messa, S., Comparison of toxic product yields of burning cables in bench and large-scale experiments, Fire Safety J., 2008, 43, 140-150. 

Figure 2. A comparison of the sensitivity of impurity detection in polyethylene cable insulation achieved with a) NAA of 1 mg samples, the solid points, b) NAA with 1 g samples, the open points and c) PIXE with 2.0 MeV protons, the two solid curves are for detection of the K and the L X-rays (data taken from ref. 2).

Oparex 15 calcined calcium sulphate (Yesos Ibericos) was evaluated as a filler in plasticised PVC cable insulation compounds in comparison with two grades of calcium carbonate. Improvements were observed in tensile, electrical and low temperature properties, flammability and heat ageing characteristics and chemical resistance for calcium sulphate filled compounds, while no significant differences in water absorption and hydrolysis were noted. Studies of rheological properties showed improved processability in mixing and extrusion trials. URALITA... 

C. Fiher-optic cable can span distances of several kilometers, because it has higher bandwidth and much lower crosstalk and interference in comparison to copper cables. 

The common application of aromatic amines is in thick-walled goods made from rubber vulcanizates. The physical loss has been considered as the main factor in the ultimate failure of goods like wire and cable coatings or automotive components. Tests report lower volatility of lid and lib,c in comparison with 11a. Excellent resistance against fugitivity at 150°C was reported for 9b (1.5% loss after 2 weeks) in comparison with 7.8% loss of a condensate like 22 and 17.5% loss of 9a [1]. Extraction tests reveal good resistance of 9b, lid and 22 [8]. 

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