Page 300 - Electrician - TT (Volume 2)

ELECTRICIAN - CITS

Advantages

1 The design and layout of the plant are quite simple
2 It occupies less space as the number and size of the auxiliaries is small.
3 It can be located at any place.
4 It can be started quickly and can pick up load in a short time.
5 There are no standby losses.
6 It requires less quantity of water for cooling.

7 The overall cost is much less than that of steam power station of the same capacity.
8 The thermal efficiency of the plant is higher than that of a steam power station.
9 It requires less operating staff.
DIsadvantages

1 The plant has high running charges as the fuel (i.e., diesel) used is costly.
2 The plant does not work satisfactorily under overload conditions for a longer period.
3 The plant can only generate small power.
4 The cost of lubrication is generally high.
5 The maintenance charges are generally high.
Schematic arrangement of diesel power station (Fig 3)

Fig 3

Apart from the diesel generator set, the plant has the following auxiliaries:
Fuel supply system: It consists of storage tank, strainers, fuel transfer pump and all day fuel tank. The fuel oil is
supplied at the plant site by rail or road. This oil is stored in the storage tank. From the storage tank, oil is pumped
to smaller all day tank at daily or short intervals. From this tank, fuel oil is passed through strainers to remove
suspended impurities. The clean oil is injected into the engine by fuel injection pump.

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CITS : Power - Electrician & Wireman - Lesson 106-116