This document is a report submitted by Adil Shamim on his 5-day vocational training at the distribution systems of Bengal Potteries. Over the course of the training, Adil learned about CESC's power distribution network, participated in maintenance activities like cable joining and transformer termination, and saw substations like BBD Bag. The training helped Adil gain hands-on experience and confidence in distribution systems that will help in his future career.

1. REPORT ON
VOCATIONAL TRAINING OF
DISTRIBUTION SYSTEMS (HT) AT BENGAL
POTTERIES (TANGRA)
SUBMITTED BY: ADIL SHAMIM
DEPARTMENT: EE
KALYANI GOVERNMENT ENGINEERING COLLEGE
UNIVERSITY ROLL NO: 10201617069
DURATION: 20.01.20202 TO 25.01.2020

2. ACKNOWLEDGEMENT
In the end of such compassionately grueling but
informative training I felt myself much more
confident and competitive. The entire credit goes to
excellent and competent personnel of your
esteemed company. Your training and guidance
showered on me by Mr. Pallav Kundu Sir, Mr.
krishnendu Bannerjee Sir, Mr. Mojahidul Islam Sir
put me in solid rock to garner courage and expertise
in facing any challenges in the years to come. I am
grateful for such whole hearted cooperation of not
only them but also all members of CESC working set
throughout the training tenure.

3. CONTENTS
 About CESC
 HT Main(Bengal Potteries)
 Detailed report of day 1
 Detailed report of day 2
 Detailed report of day 3
 Detailed report of day 4
 Detailed report of day 5
 Conclusion

4. About CESC
Kolkata has come a long way on the wings of power. Through
rapid growth and change during the world’s most eventful
decades. CESC Limited ,a RPG company brought thermal power
to India more than 100 years ago and supplies power to the city
Kolkata , serving 11 million population across it’s are of 567
sq.mt the peak load so far handledmore than 1300 MW and it’s
no of consumer crossed 3.2 million. CESC have now three
generating stations. They are Titagarh, Southern and Budge
Budge. Their capacities are (4x60MW), (2x67.5MW),
(3x250MW) respectively. CESC is not only a generating station
but also a power distribution company. It’s no of receiving
stations are 6. The no of 132 KV substation is 7.It’s distribution
station is around 115.The no of Distribution Transformers is
around 9000. Power is distributed for industrial, domestic and
commercial purposes. We all know that pollution is main
obstacle in way of power generation. CESC is so much
concerned about the environment that it has India’s most
environment friendly generating stations.

5. HT Main(Bengal Potteries)
The HT Main Office falls under the HT distribution
system area. HT means ‘High Tension’. The cables
used here are of voltage level 6 KV or above. The
maintenance and breakdown work is efficiently
undertaken by the skilled workers of various sets.
CESC CENTRAL DISTRICT(CCD)
District code: 03
L.T. districts: 10, Distribution area: 567 sqkm – 6 commercial areas
L.T. districts:
1. Calcutta central district
2. Calcutta south district
3. Calcutta southwest district
4. Calcutta west sub-urban district
5. Calcutta Southern district
6. Calcutta northern district
7. Calcutta north district
8. Calcutta north sub-urban district
9. Howrah district
10. Serampore district
H.T. department has three parts:
1. Utility cell
2. Breakdown, network & maintenance
3. Construction cell

6. Detailed Report of Day 1
 I reported at Poddar Court at 9 am.
 There I was asked to go to B.B.D Bag 132KV sustation.
 In that substation voltage is stepped out in three levels 132/33KV,
33/11KV and 33/6KV.
 There I was introduced to distribution management(DMS)
software.This software depicts the single line diagram of power
system network.It shows the SLD of entire city
 DMS shows bus bars,transformers,feeder cables in single line
diagram.It helps to find out the fault location easily.If some fault
occur in HT then this command office is responsible to inform HT
main so that they can handle the fault.
 We also get to know about the layout of power system of CESC.
Mostly distribution system of CESC is Ring Main System and 95%
of it is underground.

7. Detailed Report of Day 2
 I reported to HT Main at Bengal Potteries,Tangra at 9 am.
 Mr. Pallav Kundu Sir gives the brief of different work done in their
office.He then asked me to go with the engineer to see the work
 On reaching the site,I got to know there was joining going to
happen and I got to know how to find the phase sequence using
diode and live line indicator.
 We connect diode in two phase(R & Y) at one end of the cable and
at other end with the help of live line indicator we got unique
combination for which current flow.In this way we found the
correct phase sequence of the cable
 I got to see the RMU which is used to make ring main distribution
system,meter box,oil circuit breaker.
 Then,we went to Khidderpore DS for removing the 33KV cable
from GIS.
 There I also saw 33 KV joining between single core XLPE cable and
3-core PILC cable taking place over khidderpore bridge.
 I saw the different steps involve in preparing the cable as well for
joining it.

8. Detailed Report of Day 3
 I reported to HT Main at Bengal Potteries,Tangra at 9 am.
 Mr. Mujahidul Islam Sir asked us to HT construction office at
princep street to see the termination of single core cable in the
transformer.
 On reaching the site,I got to see the termination of cable to the
transformer using flat thimble.
 There I saw the gas insulated switchgear,air cooled transformer
 Porcelain and rubber insulators I get to see.
 I understand the importance of body earthing.It is done for the
safety of operating personnel.Body earthing means connecting
the non current carrying part to ground.

9. Detailed Report of Day 4
 I reported to HT Main at Bengal Potteries,Tangra at 9 am.
 Mr. Pallav Kundu Sir asked me to go with the engineer to see the
work of termination of single core 33 KV to the GIS
 We went to khidderpore distribution station where termination
was to happen,it is a gas insulated substation.SF6 gas is use as a
circuit breaker in this substation.Its 132/33KV GIS.Before
termination engineer put the conductor to ground using the key.
 Here I get to know about the importance of neutral earthiing.
 Neutral earthing is done to avoid the floating neutral.As the load
is unbalanced due to this voltage of the star point is not
zero.Hence,the votage fluctuates if the load is connected between
this neutral and phase.To avoid it we earth the neutral point.

10. Detailed Report of Day 5
 I reported to HT Main at Bengal Potteries,Tangra at 9 am.
 Mr. Pallav Kundu Sir asked me to go with the engineer to BE
COLLEGE to see the cause of sound coming fom meter box
 We went to BE college metre room,engineer cut off the supply
from RMU with the help of switch
 Then,engineer open the box containing bus bar and check for any
voltage with live line indicator
 After that ,workers remove the tape from bus bar to see the
condition of it,it was found to be ok
 Then they remove the back cover of meter box and check the
physical condition of CT and clean with dry spray to remove any
moisture
 Then testing department perform the continuity test of CT and
VT,Megger was done to know the insulation resistance
 Finally,partial discharge was measured and after sound were
within safety limits ,supply was restored from RMU and different
metre readings were noted down.

11. Conclusion
I have completed LT Distribution System training
from Calcutta South District Office, from the period
27.01.2020 to 01.02.2020. I have learned the process
of detection of fault in supply lines, finding phase
sequence, testing of transformers,construction of
Straig joints. The training was very fruitful and
important as it helped me to gain practical
knowledge about my subject, which will help me in
future. I would like to thank the entire unit of CESC
ltd. who helped me to enhance my practical
knowledge.
Thanking You,
Yours faithfully
Adil Shamim