identify on the main components of the electrical power distribution system. for more details https://www.youtube.com/watch?v=leSHC4g1fmg&t=285s

2.  Identification On The Complete Power System.
 The Role Of Electrical Distribution System.
 Important Issues About Distribution System.
 Components Of The Distribution System.
 Medium Voltage Distribution System.
 The Distribution Transformer.
 Low Voltage Distribution System.

4.  The distribution system is a part of the power system which
is responsible for delivering the electrical energy to the
consumers.
 The distribution system must be properly designed so that
it can provide sustainable service with the required
specifications.
 The safety is a very important issue which should be taken
in consideration while designing the distribution system
because the design mistakes can lead to dangerous
accidents.

5. Distribution
System
Medium
Voltage
Low Voltage
Distributer
Loop
RMU Transformer Distribution Boards
Cables
&
Wires
Loads

6.  The MV part of the distribution system starts with a MV distributer which
exists in the distribution substation and contains a number of cells which
represent starts and ends of loops.

7.  The size of the MV distributer should be suitable to the total amount of
loads which it will feed.

8.  The MV loop is a mean by which the electrical energy can be
transmitted to specific locations, each MV loop starts with a cell in the
distributer and terminates with another cell in the same distributer.
Each loop contains a number of Ring Main Units (RMU).

9.  The RMU is the link between the MV loop and the transformer, it consists
of 3 or 4 cells each cell contains a load break switch.Two of the cells are
connected to MV loop, the third is connected to the transformer through
a fuse and the fourth is for the interconnection with another loop(if exist).
 Note: the existence of a transformer is always followed by the existence
of a RMU.

10.  The Distribution Transformer is a power transformer used to step down
the medium voltage (11 or 22kv) to low voltage (380v). (note: the voltage
values are according to the country).
 It is the link between the medium and low voltage parts of the
distribution system.
 The rating of the transformer (KVA) is determined during the design.
 The two main types of distribution transformers are dry and oil.

11.  The low voltage part of the distribution system starts with the low
voltage switch board (also called main distribution board MDB). It
receives the connection from the low voltage side of the distribution
transformer.
 The MDB have number of outgoing which are connected to submain
distribution boards SMDB.

12.  Each main distribution board should be connected to a number of
submain distribution boards as each SMDB is responsible for transfer
electrical energy to a specific region.
 Each SMDB in turn will have a number of outgoings connected to a
number of branch panels.

13.  The branch panel is the panel which contains the branch circuits (also
called final circuits) which are connected directly to the loads.

14.  Load is the item which is the distribution system is constructed to
deliver the electrical energy to it.
 The two main load systems which the electrical design engineer is
responsible for are: lighting and small power systems.
 Design of both the lighting and small power systems require making
coordination with the architectural discipline to know the important
parameters like type of ceiling, height, area, types of walls.

15.  Besides the lighting and small power loads, there are many types of
loads which are designed by the other disciplines ( mechanical, air
conditioning, light current).
 The electrical engineer should coordinate with the other disciplines to
take the locations and sizes of their loads to provide suitable feeders to
them.