SUPPLY OF CAST RESIN TRANSFORMERS
11/0.433 KV, 1000 kVA – 2 Nos
A.
General
1. The offered Transformer Make shall be VoltAmp/Voltas/BHEL /PS Electric only
2. Manufacturer or their Authorised dealer offer only will be considered. Dealers certificate and
supply list of similar transformer to be furnished
B.
The Offer shall be submitted in TWO PARTS.
i.
Techno-Commercial.
The Techno-Commercial offer shall contain the technical compliance statement in same
format and order. Necessary technical Catalogues supporting the product to be enclosed.
II. Financial:
The cost of the item in the financial bid shall be stated as below.
a. Transformer with standard accessories and Optional Fittings
b. Customer Routine Inspection charges if any
c. Charges for Heat run test
d. Charges for impulse test (optional).
e. Any other please specify clearly.
C.
D.
E.
F.
G.
H.
Clause by Clause technical Specification compliance for our specification should be
furnished (compliance shall be furnished for all the information given in page 1 to 6 as per
given format)
I. Deviations if any shall be highlighted in the offer.
II. Detail GA diagram should be submitted along with the offer
III. Better features other than specified shall be highlighted
IV. Transformer will be inspected and Tested before dispatch, Type test and Impulse test
report of similar Transformer to be enclosed
V. Spares and optional items shall be indicated with price.
Documentation:
Two sets of Operation, Maintenance and Service manuals.
Two sets of Test reports with GA, Control circuit Drawings
Warranty:
System supplied shall be covered under a warranty period of 18 months from the date of
receipt of the material at our Stores or 12 months from the date of commissioning of the unit
at site.
Bank Guarantee: Bank guarantee shall be given as per Department norms
Validity of the offer should not be less than 120 days from the tender due date
The item shall be delivered at ISRO, MCF - Hassan
Page 1
SUPPLY OF CAST RESIN TRANSFORMERS
11/0.433 kV, 1000 kVA – 2 Nos
TECHNICAL SPECIFICATIONS
The design, manufacturing and performance of equipment shall comply with all
currently applicable standards, regulations and safety codes
Sl
No.
1.
Specification
Scope
2.
3.
4.
Quantity
Make:
Standards
(with latest amendments)
5.
System of supply
6.
7.
13.
Service
KVA Rating (kVA)
a) HV winding
b) LV winding
Rated Voltage (kV)
a) HV winding
b) LV winding
Rated Frequency (Hz)
Number of phases
Connections
a) HV winding
b) LV winding
* Separate neutral bushing to be
provided externally apart from the
neutral provided in LV terminal box
Connection symbol
a) HV –LV / IS
Winding
14.
Core
15.
Tappings
1. Range
2. No. of steps
3. For high voltage variation/for low
voltage variation
8.
9.
10.
11.
12.
Supply of Cast resin (Dry) type outdoor
TRANSFORMER
2 Nos.
VoltAmp/Voltas/BHEL/PS Electric
IS 11171
IS 2026
IEC 60726
11 kV, 3 phase, 50 cycles solidly earthed
system
Continuous duty, OUT DOOR
1000 kVA
11 kV
433 Volts
50 Hz
3
Delta
Star
* required for neutral earthing
Dyn 11 / IS 2026/77
Copper winding – double wound core
Cast resin type
CRGO or better version
+7.5% to -7.5% in steps of 2.5%
off circuit tap changing links at HV side
The links and terminals shall be suitably
insulated / covered for accidental short
circuit
Page 2
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
Reference ambient temperature (0C)
a) Max. ambient air temp.
b) Min ambient temp.
Type of cooling
Temperature raise (0C)
Of winding above ambient
Insulation class
Enclosure
Total loss at rated voltage at principal
tapping and rated frequency (kW)
Component losses (kW)
a) No load loss at rated voltage on
principal tapping and at rated freq
b) Load loss at rated current at
principal tapping at 75 0C
Impedance voltage at rated current
for the principal tapping (%)
a) HV-LV
Reactance at rated current & freq.(%)
a) HV-LV
No load current at rated voltage and
rated frequency (%)
Input to cooling plant (kW)
Insulation level (kV rms)
a) Separate source power frequency
voltage with stand
i)
HV winding
ii)
LV winding
b) Induced over voltage with stand
i)
HV winding
iii)
LV winding
c) Full wave lightning Impulse
withstand voltage (kV peak)
i)
HV winding
ii)
LV winding
d) Switching Impulse withstand
voltage (kV peak)
i)
HV winding
ii)
LV winding
Efficiencies at 75 0C at UPF (%)
a) AT Full load
b) At 3/4 Full load
c) At ½ Full load
Over Load Capacity
Regulation at Full load at 75 0C (%)
a) At UPF
b) At 0.8 PF lag
50 0C
- 5 0C
AN
90 0C above ambient of 50 0C
Class F (90 0C temp rise)
IP 44 or better for outdoor application
Less than 11.5 kW
2.5 kW (Max)
9.0 kW (Max)
5.00 %
4.92
< 2%
Nil
As per IS
28 kV
3kV
As per IS
866 V
As per IS
As per IS
Better than 98.86 %
Better than 99 %
Better than 99.06 %
As per IS 6600
less than
1.02 %
3.73 %
Page 3
31.
32.
OFF circuit voltage variation by
OFF circuit link /details
Terminal arrangement
a) HV
b) LV
c) Neutral
33.
34.
35.
36.
37.
Sl
No.
1.
2.
3.
4.
5.
6.
7.
Approximate masses (Kg)
a) Core and winding
b) Enclosure, fittings and
accessories
c) Total mass
Approx. Overall Dimensions (mm)
a) Length
b) Breadth
c) Height
Despatch Details
a) Approx. Mass of heaviest
package (kg)
b) Approx. Dimension of largest
pack (mm)
Un-tanking provision
Reference standards
2.5%
Out door cable box for 3C, 150 mm2
XLPE Cable termination with cable
disconnecting chamber
Out door cable box for 6 runs of 4C, 300
mm2 PVC Cable termination with cable
disconnecting chamber. Terminal brass
palm connector as per IS and Copper Bus
bar for each phase cable terminations in
side disconnecting chamber
Separate external bushing with brass
palm connector for earthing
Note: Cable termination height shall suit
to present cables at site. Details will be
furnished during GA approval
Enclosure mounted
IS 11171
FITTINGS
Description
Specification
RTDs on LV winding
Digital Temperature scanner with RS
232 / 485 serial interface facility
Protection against over load through
RTD with alarm and trip contacts
Safety door interlocking limit switches
duly wired up to TB
Inspection / view window ( tough
glass)
Rating plate
Terminal marking plate
3 Nos
1 No.
Required
Industrial type switches required
(Make: Keycee / BCH)
Required
Required
Required
Page 4
8.
9.
10.
11.
12.
13.
14.
Two Earthing pad & terminal
Lifting lugs
Plain bi-directional Rollers Detachable
type
Mounted on C channels
Skids
Cable box
LV: 4 pole bus duct adopter box
HT Cable box for XLPE cable
termination
LV terminal connector (brass type as
per IS) with bi-metal shim for busbar
Required
Required
Required
Required
Required
Required
5 Nos. Required
15.
Jacking pads
Required
16.
Enclosure
17.
Control wiring
18.
Painting
Epoxy Siemens Grey (RAL 7032)
19.
GA Drawing
To be furnished for approval
20.
Control drawing
To be furnished for approval
The structure material used for the enclosure shall be of high
quality MS. Main frame shall be of suitable equal angles /
channels. Sheet covers used shall be not less than 1.8 mm
thickness. Additional stiffener to be provided for doors. The
enclosure shall provide not less than IP 44 protections for
outdoor use. Separate detachable rain protection hood of slope
type in addition to top cover shall be provided. Suitable
toughen glass View window to be provided wherever required.
All doors / covers shall be fixed with high quality gaskets to
with stand the rated temperature. Each door shall have
Interlock for tripping HT CB. Sufficient bottom clearance for
cooling to be incorporated
The enclosure shall be housed on MS C Channel, which will
be used for resting on installation platform at site. The system
shall have heavy-duty detachable rollers.
Through 1.1KV grade, FINOLEX / RR make flame proof
Copper stranded pre twisted conductor of 2.5 mm2 shall be
used for control circuits. All auxiliary contact terminals to be
extended up to a poly propylene / wago type common terminal
block for remote monitoring purposes
Page 5
Sl
No.
1.
2.
3.
INSPECTION AND TESTING
Inspected before despatch
Description
Specification
ROUTINE TEST
a) Measurement of winding resistance
b) Measurement of voltage ratio and
check of voltage vector relation ship
c) Measurement of impedance voltage /
short circuit impedance and load loss
d) Measurement of no load loss and
current
e) Measurement of insulation resistance
f) Dielectric tests
TYPE TEST
a) Measurement of winding resistance
b) Measurement of voltage ratio and
check of voltage vector relation ship
c) Measurement of impedance voltage /
short circuit impedance and load loss
d) Measurement of no load loss and
current
e) Measurement of insulation resistance
f) Dielectric tests
g) Temperature raise
SPECIAL TESTS (OPTIONAL )
Impulse voltage withstand test as per IS
If Similar transformer has under gone this
test enclose the test reports
To be witnessed by our Engineers
at factory
To be WITNESSED by our
Engineers at factory
To be WITNESSED by our
Engineers (OPTIONAL) at
Approved HV Lab / CPRI
OTHER
1. Any other better
features
2. Deviations if any
3. Payment terms
Within 30 days of receipt and acceptance
4. Warrantee
18 Months from the date of supply OR 12 months from the
date of Commissioning
5. Bank Gaurantee Performance of Bank guarantee as per dept. terms to be
furnished
6. Delivery
FOR Hassan
7. Validity
120 days
Page 6
TECHNICAL BID GENERAL TERMS COMPLIANCE FORMAT
Sl No.
A.
Description
General
1. Make
2 a) Supplier details
b)
c)
d)
e)
f)
B a) Technical bid
compliance
b) Price bid
compliance
c)
C a) Clause by
Clause
compliance
b)
c)
D a) Documentation
b) Minor
modifications
Specification
Compliance
Supply of VoltAmp / Voltas / BHEL
/ PS Electric make Cast Resin
Transformer
Offered make to be mentioned
Manufacturer / Authorised Dealer
If Authoriesd Dealer, Valid
Certificate to be enclosed
List of similar items supplied to be
enclosed
Company profiles to be enclosed
GA drawing and OEM catalogues
should be submitted. The
Engineering Drawing should
contain Structural Details with
dimensions
Type test / Impulse test reports of
similar Transformer to be enclosed
Techno commercial terms to be
enclosed
Price offer compliance for
DO NOT indicate
a)Transformer with standard
price here
accessories b) spares and Optional
Fittings, c) Customer Inspection –
routine, Heat run and Impulse with
stand test as per Inspection at Works
clause
Any other please specify clearly.
Clause by clause Technical
specification compliance along with
the Bill of Material
Any other better features
Deviation if any
Two sets of Operation, Maintenance
and Service manuals.
Two sets of Test reports with GA,
Control circuit Drawings
Any minor modifications/deviations
in Electrical or Mechanical, pointed
out by our Engineer during
Inspection has to be carried out
without any additional cost
implications
Page 7
c) Test equipment
Calibration
reports
E
Warrantee
F
G
Performance
Bank Guarantee
Validity
H
Delivery
Calibration reports of testing
equipments and test certificates of
accessories to be supplied by you, to
be submitted to our inspecting
engineer during inspection
The equipment shall carry the
warrantee against faulty materials,
design or workmanship for a period
not less than 18 months from the
date of receipt of material at our
stores OR 12 months from the date
of Commissioning whichever is
earlier
Performance Bank Guarantee shall
be provided as per department terms
Offer validity should not be less
than 120 days from the tender due
date
FOR MCF - Hassan
TECHNICAL SPECIFICATIONS COMPLIANCE FORMAT
The design, manufacturing and performance of equipment shall comply with all
currently applicable standards, regulations and safety codes
Sl
Description
Specification
Compliance
No.
1.
Scope
Supply of Cast resin (Dry)
type outdoor
TRANSFORMER
2.
Quantity
2 Nos.
3.
Make:
VoltAmp/Voltas/BHEL/PS
Electric
4.
Standards
IS 11171
(with latest amendments)
IS 2026 , IEC 60726
5.
System of supply
11 kV, 3 phase, 50 cycles
solidly earthed system
6.
Service
Continuous duty, OUT
DOOR
7.
KVA Rating (kVA)
1000 kVA
a) HV winding
b) LV winding
8.
Rated Voltage (kV)
a) HV winding
11 kV
b) LV winding
433 Volts
9.
Rated Frequency (Hz)
50 Hz
Page 8
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
Number of phases
Connections
a) HV winding
b) LV winding
* Separate neutral bushing
to be provided externally
apart from the neutral
provided in LV terminal
box
Connection symbol
a) HV –LV / IS
Winding
Core
Tappings
4. Range
5. No. of steps
6. For high voltage
variation/for low
voltage variation
Reference ambient
temperature (0C)
c) Max. ambient air temp.
d) Min ambient temp.
Type of cooling
Temperature raise (0C)
Of winding above ambient
Insulation class
Enclosure
Total loss at rated voltage
at principal tapping and
rated frequency (kW)
Component losses (kW)
c) No load loss at rated
voltage on principal
tapping and at rated
freq
d) Load loss at rated
current at principal
tapping at 75 0C
Impedance voltage at rated
current for the principal
tapping (%)
a) HV-LV
3
Delta
Star
* required for neutral
earthing
Dyn 11 / IS 2026/77
Copper winding – double
wound core Cast resin type
CRGO or better version
+7.5% to -7.5% in steps of
2.5% off circuit tap changing
links at HV side
The links and terminals shall
be suitably insulated /
covered for accidental short
circuit
50 0C
- 5 0C
AN
90 0C above ambient of 50
0
C
Class F (90 0C temp rise)
IP 44 or better for outdoor
application
Less than 11.5 kW
2.5 kW (Max)
9.0 kW (Max)
5.00 %
Page 9
24.
25.
26.
27.
28.
29.
30.
31.
Reactance at rated current
& freq.(%)
a) HV-LV
No load current at rated
voltage and rated
frequency (%)
Input to cooling plant
(kW)
Insulation level (kV rms)
e) Separate source power
frequency voltage with
stand
iv)
HV winding
v)
LV winding
f) Induced over voltage
with stand
j)
HV winding
vi)
LV winding
g) Full wave lightning
Impulse withstand
voltage (kV peak)
iii)
HV winding
iv)
LV winding
h) Switching Impulse
withstand voltage (kV
peak)
j)
HV winding
iii)
LV winding
Efficiencies at 75 0C at
UPF (%)
d) AT Full load
e) At 3/4 Full load
f) At ½ Full load
Over Load Capacity
Regulation at Full load at
75 0C (%)
c) At UPF
d) At 0.8 PF lag
OFF circuit voltage
variation by
OFF circuit link /details
4.92
< 2%
Nil
As per IS
28 kV
3kV
As per IS
866 V
As per IS
As per IS
Better than 98.86 % Better
than 99 %
Better than 99.06 %
As per IS 6600
less than
1.02 %
3.73 %
2.5%
Page 10
32.
33.
34.
35.
36.
37.
Sl
38.
39.
40.
41.
42.
43.
44.
Out door cable box for 3C, 150 mm2
XLPE Cable termination with cable
disconnecting chamber
Out door cable box for 6 runs of 4C, 300
e) LV
mm2 PVC Cable termination with cable
disconnecting chamber. Terminal brass
f) Neutral
palm connector as per IS and Copper
Bus bar for each phase cable
terminations in side disconnecting
chamber Separate external bushing with
brass palm connector for earthing
Note: Cable termination height shall suit
to present cables at site. Details will be
furnished during GA approval
Approximate masses (Kg)
d) Core and winding
e) Enclosure, fittings and
accessories
f) Total mass
Approx. Overall
Dimensions (mm)
d) Length
e) Breadth
f) Height
Despatch Details
c) Approx. Mass of
heaviest package (kg)
d) Approx. Dimension of
largest pack (mm)
Un-tanking provision
Enclosure mounted
Reference standards
IS 11171
Terminal
arrangement
d) HV
FITTINGS
Description/ Specification
RTDs on LV winding
3 Nos
Digital Temperature scanner with RS
1 No.
232 / 485 serial interface facility
Protection against over load through
Required
RTD with alarm and trip contacts
Safety door interlocking limit switches
Industrial type
duly wired up to TB
switches required
(Make: Keycee /
BCH)
Inspection / view window ( tough
Required
glass)
Rating plate
Required
Terminal marking plate
Required
Page 11
45.
46.
47.
48.
49.
50.
51.
Two Earthing pad & terminal
Lifting lugs
Plain bi-directional Rollers Detachable
type, Mounted on C channels
Skids
Cable box
LV: 4 pole bus duct adopter box
HT Cable box for XLPE cable
termination
LV terminal connector (brass type as
per IS) with bi-metal shim for busbar
Required
Required
Required
Required
Required
Required
5 Nos. Required
52.
Jacking pads
Required
53.
Enclosure
54.
Control wiring
55.
Painting
The structure material used for the
enclosure shall be of high quality MS.
Main frame shall be of suitable equal
angles / channels. Sheet covers used
shall be not less than 1.8 mm thickness.
Additional stiffener to be provided for
doors. The enclosure shall provide not
less than IP 44 protections for outdoor
use. Separate detachable rain protection
hood of slope type in addition to top
cover shall be provided. Suitable
toughen glass View window to be
provided wherever required. All doors /
covers shall be fixed with high quality
gaskets to with stand the rated
temperature. Each door shall have
Interlock for tripping HT CB. Sufficient
bottom clearance for cooling to be
incorporated The enclosure shall be
housed on MS C Channel, which will be
used for resting on installation platform
at site. The system shall have heavyduty detachable rollers.
Through 1.1KV grade, FINOLEX / RR
make flame proof Copper stranded pre
twisted conductor of 2.5 mm2 shall be
used for control circuits. All auxiliary
contact terminals to be extended up to a
poly propylene / wago type common
terminal block for remote monitoring
purposes
Epoxy Siemens Grey (RAL 7032)
56.
GA Drawing
To be furnished for approval
Page 12
57.
Control drawing
To be furnished for approval
INSPECTION AND TESTING
Inspected before dispatch at works
Sl
No.
58.
59.
60.
Description
Specification
ROUTINE TEST
a) Measurement of winding resistance
b) Measurement of voltage ratio and
check of voltage vector relation ship
c) Measurement of impedance voltage /
short circuit impedance and load loss
d) Measurement of no load loss and
current
e) Measurement of insulation resistance
f) Dielectric tests
To be witnessed
by our
Engineers at
factory
TYPE TEST
a) Measurement of winding resistance
b) Measurement of voltage ratio and
check of voltage vector relation ship
c) Measurement of impedance voltage /
short circuit impedance and load loss
d) Measurement of no load loss and
current
e) Measurement of insulation resistance
f) Dielectric tests
g) Temperature raise (Heat run)
To be
WITNESSED
by our
Engineers at
factory
SPECIAL TESTS (OPTIONAL)
Impulse voltage withstand test as per IS,
Furnish the report If similar transformer
has under gone this test
To be
WITNESSED
by our
Engineers
(OPTIONAL)
at Approved
HV Lab / CPRI
Page 13