An Introduction To Reliability and Maintainability by Charles E. Ebeling

By Charles E. Ebeling

This functional and smooth method of reliability bargains with middle innovations, significant types, and confirmed strategies. the pc software program packaged within the Instructor's handbook permits scholars to target ideas and research rather than tedius numerical calculations. correct to all departments of engineering, really commercial, this article offers an advent to chance and statistical concepts that's essential to aid the improvement of reliability and maintainability suggestions.

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Example text

For all types of disconnect switches previously mentioned, phase spacing is usually adjusted to satisfy the spacing of the bus system installed in the substation. In order to attain proper electrical performance, the standards establish minimum metal-to-metal clearances to be maintained for a given switch type and kV rating. Prior to about 1970, almost all switches had copper live part construction and met a standard that allows a 30°C temperature rise when the switch is energized and carrying its full nameplate current value.

Cost of a single bus arrangement is relatively low, but also is the operational flexibility; for example, transfer of loads from one circuit to another would require additional switching devices outside the substation. Line connections to a single bus arrangement are normally straight forward, since all lines are connected to the same main bus. Therefore, lines can be connected on the main bus in areas closest to the direction of the departing line, thus mitigating lines crossing outside the substation.

Disconnect switches are normally used to provide a point of visual isolation of the substation equipment for maintenance. Typically a disconnect switch would be installed on each side of a piece of substation equipment to provide a visible confirmation that the power conductors have been opened for personnel safety. Once the switches are operated to the open position, portable safety grounds can be attached to the de-energized equipment for worker protection. In place of portable grounds or in addition to portable grounds (as a means of redundant safety), switches can be equipped with grounding blades to perform the safety grounding function.

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