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    Power Cables – Audio Advisor

    Power cables/cords from leading brands offered at Audio Advisor. An array of brands include: Kimber Kable, Pangea, & Cardas, carrying either IEC or C7 connectors.

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    DC Power Cables – PI Manufacturing

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    DC Power Cables – PI Manufacturing

    AC Power Cords DC Power Cables … 1ft 20AWG 12V DC Power Cable Male to Male (Plug), ID 2.1mm OD 5.5mm: Part Number: VB870-DC-12-20: In Stock; Ships out same business …

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    AC Power Cables for sale from PacificCable.com. In addition to AC PowerCables we also sell other Computer, Networking and Home Theater cables and accessories.

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    DC Power Cables – PI Manufacturing

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High voltage is defined as any voltage over 1000 volts. Cables for 3000 and 6000 volts exist, but the majority of cables are used from 10 kV and upward. Those of 10 to 33 kV are usually called medium voltage cables, those over 50 kV high voltage cables.

Figure 1, cross section of a high-voltage cable, (1) conductor (3) insulation (2) and (4) semiconducting layers  outer conductor and outer coat.

Modern HV cables have a simple design consisting of few parts. A conductor of copper or aluminum wires transports the current, see in figure 1.

Conductor sections up to 2000 mm2 may transport currents up to 2000 amperes. The individual strands are often preshaped to provide a smoother overall circumference. The insulation  may consist of cross-linked polyethylene, also called XLPE. It is reasonably flexible and tolerates operating temperatures up to 120 °C. EPDM is also an insulation.

At the inner and outer  sides of this insulation, semi-conducting layers are fused to the insulation. The function of these layers is to prevent air-filled cavities between the metal conductors and the dielectric so that little electric discharges cannot arise and endanger the insulation material.

The outer conductor or sheath serves as an earthed layer and will conduct leakage currents if needed.

Most high-voltage cables for power transmission that are currently sold on the market are insulated by a sheath of cross-linked polyethylene (XLPE). Some cables may have a lead or aluminium jacket in conjunction with XLPE insulation to allow for fiber optics. Before 1960, underground power cables were insulated with oil and paper and ran in a rigid steel pipe, or a semi-rigid aluminium or lead jacket or sheath. The oil was kept under pressure to prevent formation of voids that would allow partial dischargeswithin the cable insulation. There are still many of these oil-and-paper insulated cables in use worldwide. Between 1960 and 1990, polymers became more widely used at distribution voltages, mostly EPDM (ethylene propylene diene M-class); however, their relative unreliability, particularly early XLPE, resulted in a slow uptake at transmission voltages. While cables of 330 kV are commonly constructed using XLPE, this has occurred only in recent decades.

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