M.R.S, Colony , Tel. Exchange, A.C Plant

1. Ankit kumar
B.tech/ en/ 2year
TRAINING REPORT

2. List of shop visited during 1 month training:-
 Colony
A.C Plant
M.R.S
Tel. exchange

3. A.C plant in D.L.W consists of centralized
air conditioning system manufactured by
blue star and another one by voltas.
This plant supply chilled air to the staff
rooms and halls of workshop where diesel
engines are being manufactured

4. A.C plant.

5. • MAIN COMPONENT OF A.C PLANT
ARE AS FOLLOWS:-
• *C.T fan.
• *Condenser.
• *Chiller.
• *Compressor.
• *A.H.U

6. WORKING:-
• (1.) C.T fan:-
It is
situated over cooling
tower .Heated water from
condenser when passes
across it then it takes
heat from water and in
the form of vapor it
release heat energy to
atmosphere and cooled
air through fins gets
stored in cooling tower
tank .

7. (2.) Compressor:-
Floron 22 gas from
cylinder is passed though compressor
where pressure of gas is increased to 220-
270 psi. This high pressure gas passes to
condenser where it gets liquefied this
liquefied gas passes through chiller where
it cools water and then this low pressure
gas of 50-65 psi again enters to
compressor and this circulation kept on
going till cooling process is done

8. • (3.) Condenser:-
In the condenser, the
temperature of the superheated
vapour has to be brought down, before
it can be condensed into a liquid. In
the condenser, once the
• vapour has been cooled, it begins to
condense.The high pressure gases get
converted into liquid here and this
liquid go to chiller tank.
• There are three types
condensers viz.
• i) Air-Cooled ii)Water-Cooled iii)
Evaporative. Water cooled condensers
are used in Central AC Plants.
• (4.) Chiller:-
In chiller water is passed
through water line and liquefied Floron
gas passes through tank and the water
passing in water line of chiller gets
cooled and this water is transferred to
A.H.U.
• (6.) A.H.U (Air Handling Unit):-
In this section chilled air
is pass through water line which cools
air surrounding this water line and this
air through duct passes to the area
which required cooling and the
exhaust air from cooling area is again
brought back to a.h.u through duct and
this air again cooled and sent back to
cooling area.

10. (5.) Cooling tower:-
The cooling towers is used in conjunction
with the water cooled condenser. Water in passing through the
condenser water tubes only gets warmed up but does not get
contaminated. It can therefore be used again, after
cooling. The cooling tower cools the warm water for recirculating it
in the condenser. It is thus a water conservation equipment. The
heat removed by the
refrigeration system from the space or product to be
cooled is ultimately thrown to the atmosphere through
the cooling tower in a water-cooled condenser system.
Thus the cooling tower should function efficiently for
the refrigeration system to perform well

11. • ADVANTAGE OF
CENTRALISED AC PLANT:-
advantage of this
system is that the processing
of air is centrally controlled and
therefore a high standard of
efficiency can be maintained.
DISADVANTAGE OF THIS
SYSTEM:-
* Adjustment of
individual room temperature as
required from time to time is
not possible. Therefore the
system is definitely wrong from
buildings which are split up
into a number of small rooms,
offices.
 * It permits mixing of air,
cigarette smoke, bacteria and
odor between different areas
of offices.
• * The ducting occupies an
appreciable space.

12. COLONY
Main component of substation no.3 are:-
• Transformer of 750kva
• H.T and L.T panel
• Capacitor bank
AREA OF SUPPLY:-
• Hospital
• Colony of DLW
• Markets
• Water pump

14. • Rating of transformer:-
• Company name:-AREVA
• Type of cooling:-ONAN (Oil Natural Air Natural)
• KVA rating:-750KVA
• H.T:-11kV, 39.4A
• L.T:-415v, 1043.4A
• Tfr winding:-DY11
• MEANING OF DY11:
• D:-Delta
• Y:-Star
• 11:-Phase displacement

15. Oil Used In Transformer:-
*Light Napthelic Distillate
• Earthing:-
• It implies connection of non-current carrying parts
to ground like metallic enclosures.
• Grounding:-
• Grounding implies connection of current carrying
parts to ground.
• Ring System:-
•
• More than one path available between the points.
• Radial System:-
• Only one path is available between two points.
• Substation no.3 is based on ring system .

16. 132kv is supply to 2 and 6 no. substations
Other 7 are connected as shown in below figure

17. • Buchholz relay
• In the field of electric power distribution
and transmission, a Buchholz relay is a
safety device mounted on some oil-filled
power transformers and reactors,
equipped with an external overhead oil
reservoir called a "conservator". The
Buchholz relay is used as a protective
device sensitive to the effects of dielectric
failure inside the equipment.

18. Main Receiving Substation(MRS)
• MRS receives main supply from UPPCL (Uttar
Pradesh Power Corporation Limited,)
• This is step down with 7.5MVA transformer. The
33kv feeder is transformed is two 11kv feeder with a
bus coupler in between.
• The MRS follows ring type distribution system for
supplying power to D.L.W.The advantage of ring
type system is that each substation is fed from two
sides. If in case one line is faulted then the substation
is fed from other line. But major disadvantages of
ring type system are that it is too costly.

19. Main component of MRS:-
Transformer.
Control panel.
Bus Coupler.
Relays.
Circuit Breaker.
Capacitor Bank.

20. DISTRIBUTION CHART:-

21. CIRCUIT BREAKER:-
• It is an automatic
operated switch
designed to protect
an electrical circuit
from damage caused
by overload or short
circuit.

22. • There are three D.G (Diesel Generator)
sets in Mrs.:-
• (1.) 2600 H.P
• (2.) 1200 H.P
• (3.) 3500 H.P

23. RELAYS:-
• Relays are used for protection of the power
system from different faults which are occurring
in the power system. A relay is a simple
electromechanical switch made up of an
electromagnets and a set of contacts. Relays
are found hidden in all sorts of device.
• TWO TYPES OS RELAYS USED IN MRS
ARE:-
• >Definite relay
• >Inverse relay

24. CONTROL PANEL:-
• Control panel is a flat,
often vertical area
where control or
monitoring
instruments are
displayed.

25. CAPACITOR BANK:-
• In the electrical system the power factor
play a important role because by
improving the power factor one can
reduce losses .Generally power factor
should not be brought below 0.8 for
industrial loads. To improve power factor,
capacitor bank are placed in parallel with
the power supply. In DLW, 600KVAR
capacitor bank is used for the
improvement of power factor.

26. Capacitor bank contd………..
• REASON FOR
IMPROVEMENT OF
POWER FACTOR:-
• *Reduced losses.
• *Reactive power
decreased active
power increases.
• *Efficiency of machine
increases.