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.
Start and stop push buttons also provided on metering panel to give input commands such as turn ON supply and emergency stop.
These panels are similar to the LT panels, however rating of these panels is somewhat less than LT panels and also these are placed in a particular section of an industry (such as assembling section or dispatching section) instead near the transformer as in case of LT panel.
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.
It is a separate panel that consisting of bus bars, MCCBs, tuned reactors, capacitor units, contactors, metering equipment, and cables.
It is also called as automatic power factor correction panel (APFC).
ACB also gives the necessary indication and metering requirements with the use of CTs, lamps, ammeter, voltmeters, etc.
Bus bars are made with high conductivity copper (in some cases, aluminum bus bars are used to reduce the cost).
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.