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John G. Webster (Editor) 's 46.Power Delivery PDF

By John G. Webster (Editor)

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All Rights Reserved. 2008 23:52:43 ❍ ❍ ❍ Advanced Product Search Search All Content Acronym Finder 172 CONDUCTORS, ELECTRIC which means that an electric cable made out of aluminum can be quite light in comparison with copper. The main electrical application of aluminum is in the fabrication of overhead power transmission cables, which should be made as light as possible. A few other metals are used for highly specialized applications. Tin and lead, for example, are poor electrical conductors, but they are commonly found in solder alloys since they have a low melting point.

The breaker is shown in the open position (courtesy of Cutler-Hammer). shown in Fig. 4. The figure shows the breaker is free standing and with the front removed to show the insulators, linkages, and vacuum interrupters. The mechanism and controls are contained in the low part of the breaker. Overvoltage or overcurrent sensors, such as potential transformers or current transformers, provide information about the circuit, needed to decide when to trip breakers. High-voltage and medium-voltage breakers have signals from these transformers fed to relays which are programmed to open the breaker at the proper time.

Compressed-Gas Breaker The compressed-gas breaker may contain either compressed air or SF6. The vessel that contains the compressed gas is metal, and it is either grounded, called a dead tank, or ungrounded, called a live tank. Figure 3 shows a 500 kV livetank, compressed-air breaker and Fig. 6 shows a 362 kV livetank SF6 breaker. Here a vertical insulating post supports the live tank. The current interrupters are within the tank. The Oil Breaker The oil breaker consists of an oil tank with a current interrupting element in it, known as the interrupter.

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46.Power Delivery by John G. Webster (Editor)

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