By Michel Mardiguian
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Extra info for How to control electrical noise
The margin is often chosen to be 25% above the TPPL. If the feeders are plain cables or overhead lines then it is a simple matter to choose their cross-sectional areas to match the current at the 125% duty. For transformer feeders there are two choices that are normally available. Most power transformers can be ﬁtted with external cooling fans, provided the attachments for these fans are included in the original purchase order. It is common practice to order transformers initially without fans and operate them as ONAN until the demand increases to justify the fan cooling.
1 × 633) = 1236 kW 600 7 ESTIMATION OF PLANT ELECTRICAL LOAD This in turn will enable an initial layout of all the facilities and equipment to be proposed. 1. 8 show the individual loads that are known at the beginning of the project. The total power is found to be 12,029 kW. At this stage it is not known whether the plant is capable of future expansion. The oil and gas geological reservoir may not have a long life expectation, and the number of wells that can be accommodated on the platform may be limited.
These ﬁgures also show the effect of practical inefﬁciencies that occur both in the air compressor and the turbine. Air is drawn into the compressor at atmospheric pressure P1 (in practice slightly lower due to the inlet silencer, ﬁlter and ducting) and atmospheric temperature T1 , and compressed adiabatically to a higher pressure P2 to reduce its volume to V2 and raise its temperature to T2 . g. References 1 to 5. 7 Pressure versus volume in the thermodynamic cycle. Temperature versus entropy in the thermodynamic cycle.