Failure of a distribution center

This essentially means the failure of an individual drive of a pump, compressor, fan, and so on. Failure of a single motor does not always mean it will affect only one relief valve. Depending on the drive that fails, the relief can be substantial. The following situations should be considered carefully in evaluating the impact of local power failure  

This may create more serious problems than individual local power failure. The impact of a particular bus bar design and the motors connected to a particular bus bar are very important in estimating contingency. It is often preferred that the electrical engineer and process engineer work together to establish the design of the bus bar. 

Some designs allow for power from a different source in the event of failure of the main power source. Because this type of system requires operator intervention to prevent overpressure in the equipment, no credit shall be allowed for the availability of an alternative power supply. 

Another possibility exists in the design of a bus bar in the same substation where half of the motors are connected through a different bus bar. In such a situation, availability of 50% power can be assumed in estimating the relief contingency. 

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Failure of a distribution center, such as a particular MCC in the production area... 

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