Report For 25MVA-110-33KV PR - TR.TNR SS

TANGEDCO
O/o
The Superintending Engineer,
CEDC/Chengalpattu.
NOTE:
Sub: Electricity – CEDC-CGL - Proposal for introduction of 1x25 MVA Power
Transformer on 33 KV side atVellur 110/11 KV SS - Administrative
approval - Reg.
******
This note seeks the administrative approval for erection of 1X25 MVA Power
Transformer on 33 KV side at Vellur110/11 KV SS in Chengalpattu EDC/Chengalpattu of
Chennai South Region at an estimated cost of Rs. 426 lakhs Gross and Nett.
1. NECESSITY:
Vellur110/11 KV SS.is in service with 1X16 MVA, 110/11 KV on 11 KV side.This proposal
is in need for an alternate source for 33/11 KV Adaiyalachery SS ad 33/11 KV
Kadugupattu SS which has only one main source from 110/33/11 KV Cheyyur SS.
110 KV side
a) Details of existing 1X16 MVA 110/11 KV Power Transformer.
110/11KV Date of commissioning Peak so far reached

PR TR I( 16 MVA ) 2014 14.9 A at 10.00 Hrs on 30.04.2016
33 KV Side
b) Now Proposed 1 X 25 MVA, 110/33 KV Power Transformer
As alternate source for Adaiyalachery 33/11 KV SS and 33/11 KV Kadugupattu SS.
2. DETAILS OF THE SOURCE SS:

Acharapakkam 230 / 110KV Sub-Station:
Capacity: 2*100 MVA Voltage: 230 / 110KV
Peak reached so far: 417 Amps/80.16 MVA on 24.9.2012 at 23.00Hrs.
3. DETAILS OF WORK INVOLVED:

Provision of 1X25 MVA Power Transformer at 110/11 KV Vellur SS.
4. ESTIMATED COST:
The estimated cost of the proposal works out to Rs. 426 lakhs Gross
andNett as per 2016-2017 cost data. Detailed estimate is annexed to this note.
The expenditure is chargeable to TANGEDCO - Funds – Capital expenditure –

Chennai EDC/South - A/C Code No: 14 - ----.
IRR for this scheme falls on negative side, due to the average rate of
realization ( 338 paise/ unit) is less than the average cost of supply ( 489 paise/
unit). Though the IRR is negative, the proposal may be considered as a special
case of exemption as per BP( No) 83 dt. 16.05.1998 ( item vii - b), in order to
accommodate the future load growth, to meet out the summer demand, to
have reliability, to have grid stability & operational flexibility and to maintain
quality supply.
6. COMPETENT AUTHORITY:
Chairman cum MD/TANGEDCO is delegated with full powers to sanction the
proposals for erection of additional capacity in power transformers, provision of
additional power transformers and introduction of new voltage ratio etc. in an
existing substation irrespective of the estimated cost vide BP(FB) No:13 dt
14.03.2008.
7. APPROVAL REQUIRED:
Hence, the introduction of 1X25 MVA Power Transformer in 110/33 KV at 110/11 KV
Vellur SS in Chengalpattu EDC/Chengalpattu of Chennai South Region at an
estimated cost of Rs. 426.00 lakhs Gross and Nett.is placed for kind approval.
SE/CEDC/CGL. CE/D/S. CE/PLG & RC.
CFC/GL.
DIR./DISTRIBUTION.
CMD/TANGEDCO.
REPORT TO ACCOMPANY THE ESTIMATE
This proposal envisages introduction of 110/33 KV power
transformer 1 X 25 MVA at Vellur 110/11 KV SS in chengalpattu EDC in Chennai
South Region at an estimated cost of Rs.426 lakhs Gross & Nett
NEED: Vellur110/11 KV SS. is in service with 1X16 MVA, 110/11 KV on 11 KV
side.This proposal is needed for an alternate source for 33/11 KV Adaiyalachery SS and
33/11 KV Kadugupattu SS which has only one main source from 110/33/11 KV Cheyyur
SS.
DETAILS OF THE SOURCE SS:

Acharapakkam 230 / 110KV Sub-Station:
Capacity: 2*100 MVA Voltage: 230 / 110KV
Peak reached so far: 417 Amps/80.16 MVA on 24.9.2012 at 23.00Hrs.
FORMAT
SL. DISCRIPTION REMARKS

NO.
1 Name of the sub station 110/11 KV VellurSS.
2 Name of the EDC and District Chengalpattu EDC/Kanchepuram
DATA ON EXISTING POWER TRANSFORMER
3 Exg. Power Transformer/Capacity and voltage 110/11KV,1X16MVA
ratio
4 Life period served by the transformer in service 2years
5 Sustained peak reached MVA of the exg. Power 2.8 MVA
Transformer due to normal loading
6 If load transfer has been carried out before Not Applicable

evolving this proposal details of such load
transfer may be given
7 Pending application loads and expected loads for
want of this enhancement. Nil
8 Load growth in the area based on previous five 2014 - 1.8 MVA
year load incident (Separate statement to be 2015 - 2.1MVA
enclosed 2016 - 2.8MVA
9 (i) Name of the near by substation, Power 110/33/11 KV Cheyyur SS and
Transformer capacity of these SS peak reached 33/11 KV Kadugupattu SS.
in the Pr. Trs. of these substation Proposal for Alternate source.
Possibility of transferring loads to near by SS.
DATA ON THE FEEDING SUB STATION
II
10 Salient features of feeding substations 230/110KV Acharapakkam SS.
(i) Power /Auto Transformer capacity and voltage Auto Transformer, 2X100MVA is in
ratio 230/110 KV service.
(ii) Sustained normal peak reached in the Power
/Auto Transformer 80.16MVA
(iii) Whether adequate capacity is available to
accommodate the proposed enhancement Yes
(iv) Any additional sanctioned Power /Auto
Transformer capacity is yet to be connected NIL
III DATA ON FEEDING LINE
11. Details of feeding line 110 KV Acharapakkam–S.P.Koil #2
I Size of the conductor and loading Capacity in Kundha
Amps and MVA 625Amps 119.07MVA
ii Details of other SS connected on the feeding
line and their connected loads in MVA Illedu 110/11 KV SS
Pr.Tr.-1X10MVA
Kaliyampoondi SS
Pr.Tr.-2X16MVA 110/33 KV side
Pr.Tr.-2X10MVA 110/11 KV
Cheyyur SS
Pr.Tr. – 2X10 MVA 110/33 KV side
Pr.Tr. – 1X10 MVA 110/11 KV side
iii Total load incident on the feeding line with the 80.16 MVA.
present conditions
iv Proposed enhancement capacity in MVA 1X25 MVA
v Anticipated total load of the line with. Pr. Trs. 85 MVA

Capacity enhancement proposed
vi Whether the line capacity is adequate Yes
vii Whether CT ratio is adequate at the feeding Yes

substations for the above line
DATA ON ADDITIONAL TRANSFORMERS
AND EQUIPMENTS REQUIRED FOR
ENHANCEMENT
12 Addl. Power /Auto Transformers enhancement New 1X25 MVA ,110/33 KV in
required in MVA 110/11 KV Vellur SS
13 Necessity Alternate source for 33/11 KV
Adaiyalachery SS and 33/11 KV
Kadugupattu SS
14 Whether addl. GC required Yes
15 Whether CT ratio of the existing GC is adequate New CT is to be provided for new
for the enhancement Details of availability (or) GC
otherwise of
a Plinth Available
b Bay provision Available
c Equipments and -
d Addl. Feeders required towards this 33 KV feeder from 110/33 KV
addl/enhancements of Power/Auto Transformers Vellur SS to 33/11 KV
Adaiyalachery SS for a route
length of 14 KM
17 Priority Immediate
a Details of already sent transformer capacity -
enhancement proposals and sanctioned if any
awaited priority wise
b Priority of this proposal Priority may be given to ensure
Alternate supply
SUPERINTENDING ENGINEER,
CEDC/CHENGALPATTU.

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TANGEDCO

110/11KV Date of commissioning Peak so far reached

2. DETAILS OF THE SOURCE SS:

3. DETAILS OF WORK INVOLVED:

The expenditure is chargeable to TANGEDCO - Funds – Capital expenditure –

SE/CEDC/CGL. CE/D/S. CE/PLG & RC.

DETAILS OF THE SOURCE SS:

SL. DISCRIPTION REMARKS

6 If load transfer has been carried out before Not Applicable

v Anticipated total load of the line with. Pr. Trs. 85 MVA

vii Whether CT ratio is adequate at the feeding Yes

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