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STANDARD
TECHNICAL SPECIFCATION
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FOR
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DISTRIBUTION
TRANSFORlVIERS
(25 KV1-\,63 KV1-\and 100 KVA RL\TINGS)
(OY\~~()o ~Ile.)
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Specifications
1.0
Scope:
1.1
1.2
The
specification
covers
engineering,
manufacture,
assembly,
stage
Inspection/testing, Inspection and testing before s~pply and delivery of 25KVA,
,
63KVA & 100 KVA distribution transformers suitable for outdoor installation in a
power system with nominal voltage of 11 KV and neutral solidly earthed.
It is not the intent to specify completely herein 'aiLthe details of the design and
'construction of equipment. However,the equipment shall conform'in all respects to
high standards of engineering, design and workmanship and shall be capable of
performing in continuous commercial ofJerationupto the bidder's guarantee, in a
, manner acceptable to the purchaser, who will interpret the meaning~ of drawings
and specification and shall have the power to reject any work or materia! which in
his judgment is not in accordance there with. The offered equipment shall be
complete with all components necessary for their effective and trouble free
operation. Such components shall be deemed to be within the scope of bidder's
supply Irrespective of whether these are specifically brought out in this specification
.end/or the Contract Agreement.
\
-a.or
2.1
STANDARDS:
The material shall confirm in all respects to the relevant IEC standards with latest
amendmentsthereof. Some of these are listed below:'
Title
r
i
IEC No.
i
Specificationfor PowertransformerOutdoorDistribution!fEC-i6
r
I Transformer
up to and including 100 KVA
n
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,
Specification for High voltage Porcelain Bushings
lEe Pub 296-1909
Specification for metal oxide lightning arrestors
I !EC 99-1
;
I Guide for loading of oil immersed transformers
l1Ec.76
I
The bidder shall use IS8 where corresponding IEC is not available. However,
where both the standards are available, IEC will be used. ISS or other National
standards are permitted where these are equivalent or supports to IEC.
In such cases salient points of difference bet\.vee'nstandards adopted and the IEC
standards shall be clearly brought out in relevant schedule. Four copies of such
standards with authentic Englis.h translation shall be furnished along with the offer.
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3.0,
,
SERVICE CONDITIONS
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The Distribution Transformers to be supplied against this specification shall be
available for satisfactory continuous operation under the following climatic
conditions.
LSr. No.
il
Ijl
iTi
j, Location
I At various locations in i
; Max.ambient air temperature(deg C)
I Min. ambient air temperature (deg C)
i Minimum relative Humidity (%)
i the State
150
i
of Haryana.
.
+---2.5
I Maximum
i 26
T95
.i--.
i Altitude abov.emean seal~el (Meters)
l45
j 120
i 900
[ 195
f-: Less than 1000
_.
relative Humidity (%)
Rt
I
AV~lmber
of storms (DayslYear)
'Vi
~
fAV:g. number of rainy Day."N.........
[ Avg. annual rainfall (mm)
VIII
--+--I Maximum
-wind pressure (kg/Sq. M)
IX
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PIWCIPAL PARA\IETERS
. .to
The transfonner shall c_<!nfirmto the following specific l)arameters
I Sr. No. !
Item!
Specifications
I
I
I IV
Rated
1-fV'
' Rated
Systemvo1ta~
Voltag~.!~
volt.lge LV
I
:
vn
vm
LX
X
!
Frequency
! No. ofEhasfs
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R.31
84.0 A
A
i TIU'ee
I TIu'ee'
Delta
Conn
COIU1ections LV
Star
Sta
poi
ou1L
,
XV
I
5.0
5.1
(Neutral
brought
point
out))
Noise level of rated voltage
and frequen~
' 45 db
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5.25
AA
133.34
50 CIS -1- 5%
! TIU'ee
! Delta
!
i
50 CiS ./- 5%
Delta
Dvn-11
ONAN
Tap chan'
aaangement i NA
Over flu."cing lintit above 12.5C!.6
nonnal working flux
XIV
:
:
i
I
1011SHV
Vec-tor Gl'OU) Type of cooling
kxn
xm
! 433 V
i11.31
33.34AA
r 50 CIS +1-5~/o
,
: 12.5 ~V
111 ~V
! 433 V
i 11 ~V
.
1
XI
:IOOI(\'1-\
I
5 KV
IIIi 12, ~V
I 433 V
V
i Linee CW1'ent
cun.mt H
LV
VI
-
G-3K\~\
! 12.5 ~V
-LContinuou~J~-ate(rc.ip; city -1-25-~vA
m
hI!
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!
,
I
. n-11
iONAN
NA
I
t
Dyn-11
I
!
-,
IONAN
!NA
~
/12.5(%
i
112.5%
I
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145
db
,
145
db
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DESIGN A1';'1)CONSTRUCTION
Core
5.1.1 The core shall be generally of high grade cold rolled grain oriented annealed
steel lamination having low loss and good grain properties and coated with oil
proof Insulation. The complete design of core must ensure permanency of the
core losses with continuous welding of ~he tran~formers. The value of
maximuM flux density in 'the design and grade of lamination used shall be
clearlystated in the offer.Max.fluxdensity willnot exceed 1.6 Tosla.
Bidders can offer transformers made. of other superior (low loss) core materials
and they should furnish design details in their bids for verificationalong with
type test certificates for the design of this transformer.
"
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5.1.2 The core shall be suitable -for over fluxing (due to combined effect of voltage
and frequency) as per 4 (XIV)above. The bidder shall furnish necessary design
data in support of this.
5.1.3 No load current shall not exceed 2% of Full load current and will be measured
by energizing the transformer at 433 Volts, 50 CIS on the secondary side.
Increase in voltage of 433 Volts by 10% shall not increase the no load current
disproportionately high. Test fEport of magnetic balance test by connecting the
LV ( b-phase ) to rated phase voltage and measurement of an, bn, cn voltages
will be carried out and value (with tolerance) shall clearly given in this offer fOf
the type tested design.
5.1.4 All core clamping accessories e.g. channels. bolts, tie rods etc. shall be painted
with oil resistant varnish or paint. The dimensional drawings of core with
clamping arrangement for type tested design must be furnished with offer.
6.0
WINDINGS
6.1 .1 Material
Double
paper covered
insulated
and electrolytic
copper for
leads. electrolytic Aluminium conductor for windings
A 1'"
f". .----
I
.6.1.3 Vertical ducts and spacers
These shall be provided with in each coil for HV and l V windings.
7.0
TRANSFORMER Oil
The transformer oil shall comply with the following requirements:
Sr. No.
"1
If
2
Characteristics
S ecified value
Strength (27 C Breakdown 30/50 KV/Minute
Fresh/ filtered
dissipation factor (tan-delta) at 0.005 (max)
3
(resistivity) at 20 C 1500x10
4
5
"6
7.
~.
. ~.O
Test report for each batch of oil shall be submitted.
TRANSFORMER lOSSES:
The maximum losses at rated voltage and rated frequency permitted at 75°C are
indicated below'No load losses in Full load losses in
Voltage ratio
KVA rating
watts (max)
watts (max)
220 .
1760
11000/433 V
100
11000/433 V
63
155
1235
11000/433 V
25
85
685
The above loss~s are maximum allowable and their would not be any
positive tolerance. Bids with higher losses then the above specified values would
be treated as Non-responsive.
Bidders are reque3ted to quote the price as FOR destination on standard
losses. The Bid will be evaluated on the basis of standard losses instead of
equated capitalized cost. No benefit of low losses to the bidder, in case the losses
are less than standard losses at cmy time.
9.0.
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PERCENTAGE IMPEDENCE:
The percentage impedance at rated frequency and 75°C is given' below:
KV A rating
100/63/25 KV A
10.0
Percentage impedance
4.5%
Subject to tolerance as per relevant standards. Bids not meeting the limits
indicated above will be treated as non responsive.
TEMPERATURE RISE:
10.1
The temperature rise over ambient shall not exceed the limit described below:Top oil temperature rise measured by Thermometer.
40°C.
10.2
Winding temperature rise measured by Resistance method.
50°C.
Bids not meeting the above limits of temperature rise will be treated as non-
re~oo~~.
.
/
KVA.
Not less than 11.Omm
II .
Radial clearance between HV & LV
III
than 10mm for 11 KV with
Phase to phase clearance between Not less
,
HV and conductor.
Min of 2x1 mm press board to cover
the tie rods.
IV
The minimum electrical clearance Not less than 30mm
between the winding and body of the
tank (between inside surface of the
tank and out side edge of the
winding)
V
Minimum end insulation to earth.
Not less than 25mm
VI
No. of coils HV per phase.
4(min)
VII
Thickness of locking spacer between 10mm (min)
HV coil.
VIII
No. axial wedges between HV & LV Shall be 6mm (min) for 25 & 63 KVA
.;.
IX
Note:-
windings equal spaced.
and shall be 8 mm (mln) for 100
KVA.
Tap load insulation (min).
1.5 mm thick with paper.
Manufacturing drawing of type tested design shall be sub/T1ittedwith the
offer.
14.0 TANK:
14.1 )The transformertank shall be of robust construction rectangular in shape and shall be
built up of tested MS sheets of the following thickness:Q
Side walls (min)
3.15mm thickness
ii)
Top and Bottom plates (min)
5.0 mm thickness.
14.2 All joints of tanks of fittings shall be oil tight and no bulging should occur during
service. The tank design shall be such that the core and the winding can be lifted
freely. Transformer should be welded inside of the main tank body so that the joint is
stronger due to V-shape welding fillet. The out side welding should be additional.
The tank plate shall be of such strength that the complete transformer when fill with oil
may be lifted bodily by means lifting lugs provided. In side of tank shall be painted
with varnish.
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14.3
Than tank shall be reinforced by welded angle (40x40x5mm) on all these outside walls
on 'the edge of the tank to form tV\lOequal compartments. Permanent deflection when
the tank without oil is subject to a vacuum of 760mm of mercury shall not be more than
5 mm upto 750mm length and 6 mm upto 1250 length. The tank shall further be
capable of with standing a pressure of 0.8 Kg 1sq. cm \.and a vacuum of 0.3 kg/sq.cm
without any deformation.
Heat dissipation by tank walls was upto oil level should be limited to 500 watt! sq.mtr
and above coil level limited to 250 watt!sq.mtr atJd cooling tube limited to 350
wattlsq.mtr.
14.4
14.4.1 The radiators can be tube type or fin type )r pressed steel type to achieve the desired
cooling to limit the specified temperature rise.
'
14.4.2 Four Nos. welded heavy duty lifting lugs of MS plate 8mm thick (Min ) suitably
reinforces by vertical supporting flat welded edge wise below the lugs on the side wall.
14.4.3 Four Nos. of welded heavy duty cooling lugs of MS plate 8 mm thick(Mln) shall be
provided to pull the transformer horizontally.
14.4.4 Top cover fixing belts of GI 12mm dia meter spaced at 100mm apart 6mm Neoprene
,
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bonded cor!t, gasket will be placed between tank and cover. The bolts outside tank
shall have 2 flats washers and one spring washer.
.14.4.5Pressure release valve as standard fitment shall be provided of the top of the tank of
transformerswhich should operateat a pressure of 0.3 to 0.5 kg/sq.cm.
14.4.6 The conservatorwith oil gauge with plain or dehydration breathing device with a drain
,
plug and fitting hole with cover shall be provided. The capacity .of,the conservator
tanks shall be designed keeping in view the total quantity of oil and its contraction and
expansiondue to temperaturevariations.
15.0 BUSHINGS:
15.1 The bushings shall conform to the, relevant standa~ds specified and shall be outdoor.
The Bushing rods and nuts shall be made of brass material 12mm. Diameter for both
HT & LT. The bushings shall be fixed to the transformer on sides with straight pockets
and in the same plane. The tests as per relevant standards shall be conducted on the
transformers bushings as detailed below:
15.1.1
15.1.2
]r
15.1.3
15.1.4
15.1.5
15.2
'
Dry flashover voltage:
Wet flashover voltage.
Dry one minute withstand voltage.
Wet half minute withstand voltage.
Impulse withstand voltage (1.2/50 micro seconds positive wave).
For 11 KV- 12-17.5KV class bushings shall be used and for LV 1.1 KV class bushings
shall be used. Bushings of plain sheds as per relevant standards shall be mounted on
the side or top cover of the tank.
15.3
Dimensions of the bushings
specified.
of the voltage class shall confirm to the standards
15.4
Min phase to phase clearance of 75 mm for LV (upto 1.1 KV bushings) and 255 mm
for
HV (3.3KV and above) bushing shall be obtained with the bushing mounted on the
transformer.
15.5
Brazing of all interconnection, jumpers from winding to bushing shall have cross
section larger then the winding conductor. For aluminum standard make aluminum
brazing rod shall be used.
"
15.6
The bushing shall be of reputed make supplied by those manufacturing who are
having manufacturing and testing facilities. At least three name of sources from which
these bushings shall be procured by given in the offer.
15.7
The LV bushing and HV bushing stains shall be provided with suitable terminal
connectors 50 as to connect the jumper without disturbing the bushing stem. High
voltage
pha:;e winding
shall Ibe marked
on
thA (}/ltc::ir!o
IMith "",...;+_1
~"'''' both
nu in the
., terminal boards inside the tank and
16.0 FITTINGS:
The following standard fittings shall be provided.
16.1 Rating and terminal marking plate non detachable.
16.2 2 Nos. earthing terminal with lugs.
16.3
16.4
16.5
16.6
16.7
16.8
16.9
17.0
,
7 Nos. Bimetallic terminal connectors 011H'/ & LV bushings.
1 No. thermometer pocket with cap.
Pressure relief vent with a hood tc direct the oil to the ground.
3 Nos HV bushings.
4 Nos. LV bushings.
3 Nos. metal oxide lightning arrestors with GI earth strip.
2 years guarantee from the date of receipt of material embossed plate welded
below name plate.
MOUNTING ARRANGEMENT:
The under base of the transformers shall be provided with two 75x10mm channel
.1 -'1' 460mm long with holes to makethem suitable per fixing on a platform or plate.
18.0 OVERLOADCAPACITY:
The transformers shall be suitable for loading as per relevant standards. The
transformers shall be so designed to obtained maximum efficiency at 80% to 100%
load.
19.0 TESTS:
20.1 The design of the transformers being offered shall be duly type tested as per relevant
standards mentioned under clause-2.0. The bidder shall furnish four sets qf type test
certiflcati'3s for the tests listed under clause 21.0 below alongwith the offer. These type
test certificates should not be more than 5 (five) years old on the date of bid opening.
Offers without these type certi.'icates will be treated as non-responsive.
In addition:to type test certificates the bid:fer shall submit tests certificates for the
routine tests mentioned under clause 20.2 below:
?f\.2
,:1'-
20.2.1
20.2.2
20.2.3
20.2.4
20.2.5
20.2.6
20.2.7
20.2.8
20.2.9
Ratio, polarity and phase sequence & windingJesistance.
No load current and losse~ at service voltage and normal frequency.
Load losses at rated current and normal frequency.
Impedance voltage test.
Resistance of windinG cold (at or near test bed temperature).
Insulation resistanc~.
Induced ov~r voltage withstand test.
Separate source voltage withstand test.
Flux ba'ance test.
20.0 TYPE TESTS TO BE CONDUCTED ON ONE UNIT:
20.1 TemperatLlre rise test for determining the max. temperature rise after
continuous full load run. The amr.ient temperature and rise of the test should be
state in the test certificate.
20.2 Impulsevoltage test ~a3per IEC.
20.3 Short circuit withstand test- thermal and dynamic ability.
20.4 Air pressuretest~as per IEC.
21.0 ACCEPTANCETESTS:
21.1
10% of the transformers offered for inspection shall be selected at random and
aresamples
to be subjected
to ranrlnm
routine test
as per clause ~___u_L.
21 above, One
transformer out
of
selected at
c:h~" ho toct",~
~,
The !=,urchaser reserve to conduct all tests on transformers after arrival at site
and the contractor shall guarantee test certificate figures under actual service
conditions.
21.3 The purchaser reserve the right to get all type test listed under .clause 23
redoneif required, on one unit from any lot at any time without any extra cost.
21.2
22.0 TOLERANCES:
,
Unless otherwise specified herein the test value of the transformers supplied should
be with in the tolerance permitted in the relevantstandard~.
23.0 FINISHING
The exterior of the transformer and )ther ferrous fittings shall be thoroughly cleaned,
scrapped and given a prime 'Y coat and two finishing coats of durable oil and weather
resisting paint or enamel. The color of the finishing coats shall be dark admiral gray,
colors for ready mixed pa;nts .
14.~
INSPECTION:
All tes1s and inspection shall be mad\) at the place of manufacturer and
unless other wise especially agreed upon the manufacturer and the purchaser
at the time of purchase:
The manufacturer shall afford the inspector
representing the purchaser all reasonable facilities, without charge to satisfy him
that the materialis being furnished in accordance with specification.,
The bidder shall give 15 days for local supplies and 30 days in case of foreign
bidders advance information to enable the purchaser to depute his representative
for witnessing acceptance routine tests.
The manufa:turershall provide all s'3fVices to establish and maintain quality of
workman ship in
his works and that of his sub-contractors to ensure the
mechanical I electrical performance of components, compliance with drawings,
identification and acceptability of all materials, parts and equipment as per latest
quality standards of ISO 9001 :2000.
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N'igam intends ~o purchase only High Quality material. For this .purpose stringent
testing of the material shall be dqne. Inspection can be got done from third party
Inspection Agency or from Nigam's own officers. 100% testing of tne T/F can be
carried out.
Samples from each lot will be sent. for testing to Shri Ram Test House/Govt.
P\pprovedlab for testing at Nigam's cost. Any lot shall be finally accepted only when
the sample are passed by the Test House. In case samples fails, the entire lot shall
be rejectedwhich will have to be lifted back by the firm at its own cost. If the sample
drawn from two or more lots are rejected by the Test House, the entire balance
quantity shall be deemed to have been cancelled and the Nigam will effect the
purchases for the balance quantity on the ri~k and cost of the supplier. For these
reasons,the firm can also be blackli~tedfor future supplies.
25.0 ADDITIONALINFORMATION:
The bidder shall invariably furnish following information alongwith his bid, failing
which his bid shall be liable for rejection. Information shall be separately given for
individual type of equipment offered.
25.1
Statement giving list of raw materials, name of sub suppliers for the raw
materials list of standards according to which raw material are tested.
25.2 List of tests normally carried on raw materials in the preSimce of bidders
representative, copies of test certificates.
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25.4
2~.5
.
25.6
.
25.7
.
out accessories.
List of manufacturing faciliti:!s available.
Level of automation achieved and list of areas where manual processing
exists.
List of areas in manufacturing process, wh~re stage inspections are
normally carried out for quality control and details of. such tests and
inspections.
L,.ist of testing equipment available with the bidder for final testing of
equipment speCified and test plan limitation. If any. vis-a-vis the type.
special acceptance and routi"e tests specified in the relevant standards.
These limitations shall be very clearly brought out in schedule of deviations
from specified test requirements.
26.0 INFORMATIONTO BE SUBMITTED AFTER AWARD OF CONTRACT:
The successful hidder shall within 30 days of the placement of order, submit the
following informationto the purchaser.
26.1 List of raw material as well as bought out accessories and the .lames of sub
,
J
,
suppliers selected from those furnished alongwith the offer.
1
"
26.2 Type Test Certificatesof raw materialsand bought out accessories.
26.3 The central passes for raw material at the time of routine testing.
26..4 Quality Assurance Plan (QAP) with held points for purchaser's inspection.
The quality assurance plan and purchasers held points shall be discussed
between the purchaser and Bidder before the QAP is finalized.
27.0 . PACKING & FORWARDING:
27.1 The packing shall be done as' per the manufacturer's
27.2
standard practice.
However. it should be ensurej that the packing is such that. the material
would not get damaged during transit by rail/road/sea.
The marking on each package shall be as per the relevant IS and shall
also contain the P.O. No. and the name of the consignee.
28.0 OTHER SERVICES:
The bidder will arrange for unloading of the consignments.
"
29.0 MANDATORYSPARES & TOOLS:
t
Nil.
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GUAHANTEED1ECIII'IICALP/\IlJ ICUI.J\HS FOB DISTRl8UTIONTRANSFORMERS
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(To bo Curnishod by the Bidder
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Sr.No. D.escrlpllol1'
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-Rating tl) kVA
COi-aMalerlal used and Grade
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a)
,'.,
b)
t:'
Over lIuxingwllhollt sotwollol.
(Curve, to bo CUI
Ills hod by the
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Fluxdensity .,..-- ---
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Place ofM,muractwo
Voltage Rallo
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Maxirl1LlIl1lcll1perDturerise or
0)
windings by roslslQrtco method
b)
(Oll,by Thermometer
Magnetizing (1'1010ad)Current at
n)
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Moxlmul1\ VlJltogo
COIO loss III Wi1lls ot 75 deg.C
0)
Normal Vallono
,
.
9.
10.
1'1.
b)
Maxhmllll Volltlge
Resistance of Willdlllgs al 20 Deg. C
(with 5% tolerm Ice)
I-IVWIIIUIIlY(ollllls)
D)
b)
LT Wlnuing (ollll\:»
Full lOudlosses (woll.s) at 7G dCfJ, C '
CUllolIl
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,12"
,
b)
UOJ15i1y w;ou
HV Winding
LT Winding
.
for
,..
.
CiearallCG3
a)
Core & LV
b)
lV&HV.
c:}
I-IV Plmso to 1'111I~O
d)
End ImJlllotiolt cloornl1ce to Earth
e}
AllY jJolllt of willdillg to lallk
EITIcioncy £It 75 Dcg. C.
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2)
3)
II)
5)
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0,0 P.r:.
12G% load
'IUU% load
75% It;':;H..I
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