Sheath high voltage

Applications Clear sheathing, high voltage insulation, optical fibre insulation, telecoms, automotive, high speed extrusion. 

Two high-voltage power supplies are used to drive the separation. The first power supply applies high voltage through a platinum electrode to the injection buffer reservoir for the first dimension separation. The second power supply applies potential to the interface through its buffer reservoir. The sheath flow cuvette is held at ground potential. 

For detonators to be used where electrostatic charges may occur, it is desirable to prevent sparking from the fusehead to the case, should a high voltage be generated on the leading wires. For this purpose, an insulating sheath is inserted, either into the detonator tube or else immediately around the fusehead. 

One of the simplest sheath models is that of a DC high voltage ( T ) sheath that contains no electrons and in which ion flow is collisionless (space-charge limited current). The resulting sheath equation is called the Child-Langmuir law [165]. 

High-Voltage Sheaths Matrix and Child Law Sheath Models... 

Numerically, the matrix sheath thickness is large and exceeds the Debye radius by 10-50 times at high voltages. A more accmate approach, the so-called Child law sheath, takes into account a decrease in the ion density due to their acceleration across the sheath. In frameworks of the model, the ion current density Jq = n eu is taken from the Child law of space-charge-limited current in a plane diode ... 

The concern about ICD extraction using conventional equipment was averted by clinical results. Even if extraction procedures were complex and time consuming, the final outcome showed no outstanding differences in comparison with results of PM lead extraction. Results of ICD lead extraction using mechanical sheaths were included in the US Lead Extraction Database published in 1999 [17], and early trials on laser-assisted sheaths were performed for both PM and ICD leads [21, 23, 45]. In 2000, Kantharia et al. reported their experience with transvenous extraction of 47 transvenous high-voltage leads implanted in 42 patients [46]. All leads were extracted - 11 by traction and 36 by mechanical dilatation - in the absence of serious complications. Extraction time was related to time from implant and degree of... 

In a high-voltage installation it is important to avoid or reduce the electric stress which can result from abrupt termination of the insulating sheath or screen of the cable. Such conditions of electrical stress can... 

As shown in Fig. 8, the high voltage power cable consists of three main aluminum cores, each of which has a diameter of 300 mm, and a neutral core of 185 mm diameter. The three main cores and the neutral core consist of 61 and 37 insulated stranded aluminum rods, respectively. The four cores are warped with polyethylene tap>e that is supported by a layer of insulation. Finally, the cable is armored with steel and wires for protection and is sheathed by an additional layer of insulated. The flow chart shown in Fig. 9, describes the flow of the cable across the different stations. 

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