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In the above figure, the elements in this Various transformers supply is given to the LT panels, which acts as a main switching system for entire power distribution scheme and carries the total load demand.We will discuss the elements inside of the LT panels in brief later in this article.These panels are distributed over various sections of an industry in order to supply the power to individual installed systems and are connected through cable ducts. In an industrial electric power system, electric power is supplied from either private utilities or public utilities, or both.
In case of maintenance of other circuit breakers on the same panel this bus coupler diverts the supply source to the other.
It is also a switchgear arrangement with ACB and provided with interlocking facility.
It makes or breaks the circuit either manually or remotely controlled during normal operating condition and break the circuit during fault condition automatically.
These can be 3/4 pole type with a rating decided by the load current (or breaking capacity) and can be either drawn out or fixed type.
These high voltages are stepped down to a low voltage using step-down transformers.
The voltages in the range of 440 volts or below are called as low tension systems.
Voltmeters, ammeter and power factor meters in LT panel indicate various parameters and these are protected with MCBs.
On all LT panels, indicating lamps (mostly LED lamps) are provided for each phase for indicating live or fault condition.
The output feeders of the LT panel are connected to sub-LT panels which are placed for a group of loads over a given section to supply the demand.
The sub-LT panel incomer is applied at SDB which are placed for supplying the power to loads that consists of a group of machineries such as electrical furnaces, hoists, etc. PDBs acts like an actual power connection of load to source where individual machinery is connected directly to the supply.