Post on 22-Sep-2020
Ministry Of Electricity and Renewable Energy وزارة الكهرباء والطاقة المتجددة
Egyptian Electricity Holding Company الشركة القابضة لكهرباء مصر
EDMS 08- 200- 2 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 22-12-2020
0
EDMS 08-200-2
TECHNICAL SPECIFICATION
FOR OIL-IMMERSED DISTRIBUTION TRANSFORMERS
(CONVENTIONAL & HERMETICALLY SEALED)
25 KVA up to 5000 KVA 22 / 0.4 KV
Ministry Of Electricity and Renewable Energy وزارة الكهرباء والطاقة المتجددة
Egyptian Electricity Holding Company الشركة القابضة لكهرباء مصر
EDMS 08- 200- 2 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 22-12-2020
1
EDMS 08-200-2
TECHNICAL SPECIFICATION
FOR
OIL-IMMERSED DISTRIBUTION TRANSFORMERS
(CONVENTIONAL & HERMETICALLY SEALED)
25 KVA up to 5000 KVA, 22 / 0.4 KV
Issue: Dec.-2020 / Rev- 2
1/7/0201سيتم العمل بالمواصفة في
( توجد بنود اختياريةOptional items .يجب تحديدها بواسطة شركة التوزيع قبل الطرح )
Ministry Of Electricity and Renewable Energy وزارة الكهرباء والطاقة المتجددة
Egyptian Electricity Holding Company الشركة القابضة لكهرباء مصر
EDMS 08- 200- 2 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 22-12-2020
2
CONTENTS
1 Scope 4
2 Applicable standards 4
3
IEC 60076 for power transformer
Part 1 General
Part 2 Temperature rise
Part 3 Insulation levels and dielectric tests
Part 4 Lightning impulse and switching impulse testing
Part 5 Ability to withstand short circuit
Part 7 Loading guide for oil-immersed power transformers
Part 20 Energy Efficiency
IEC 60214 Tap Changer
IEC 60437 Radio interference test on high-voltage insulators.
IEC 605507 Artificial pollution tests on high-voltage ceramic and glass
insulators to be used on a.c. systems
IEC 60137 Bushings for alternating voltages above 1KV.
IEC 60296 For new insulating oil transformer
EN 50464-4 Endurance test (tank test for hermetical sealed TR.).
Environmental conditions
4
4 Voltage ratio 5
5 Vector group 5
6 Rated power 5
7 Tapping range 5
8 Overload capacity 5
9 The Capability of withstanding short circuits 6
10 Limits of temperature rise 6
11 Cooling 6
12 Insulation level 6
13 Impedance voltage 6
14
Bushings 6
Ministry Of Electricity and Renewable Energy وزارة الكهرباء والطاقة المتجددة
Egyptian Electricity Holding Company الشركة القابضة لكهرباء مصر
EDMS 08- 200- 2 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 22-12-2020
3
15 Core 7
16 Windings 8
17 Transformer oil 8
18 Oil expansion conservator 8
19 Tank 8
20 Accessories 8
21 Wheels 9
22 Name plate 9
23 Transformer losses 10
24 Penalty and rejection 10
25 Transformer testing 11
26 Instruction manuals 12
27 Drawings 13
28 Spare parts 13
29 Warranty 13
30 Max. permitted power losses of transformers (at 95ºc) 14
31 Guarantee tables 14
Ministry Of Electricity and Renewable Energy وزارة الكهرباء والطاقة المتجددة
Egyptian Electricity Holding Company الشركة القابضة لكهرباء مصر
EDMS 08- 200- 2 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 22-12-2020
4
1. Scope
This specification covers the supply of three (3) phase conventional or hermetically sealed, two-
winding oil immersed distribution transformers (22/0.4KV). The transformer should be designed,
for indoor installation/outdoor with high voltage and low voltage porcelain bushings provided with
screwed stems and nuts with washers.
2. Applicable Standards
The transformers should comply with the latest edition of IEC publications Unless otherwise
specified in this specification, should comply with the latest edition of IEC standards as follows:
IEC 60076 for power transformer
Part 1 General
Part 2 Temperature rise
Part 3 Insulation levels and dielectric tests
Part 4 Lightning impulse and switching impulse testing
Part 5 Ability to withstand short circuit
Part 7 Loading guide for oil-immersed power transformers
Part 20 Energy Efficiency
IEC 60214 Tap Changer
IEC 60437 Radio interference test on high-voltage insulators.
IEC 605507 Artificial pollution tests on high-voltage ceramic and glass insulators to be
used on a.c. systems
IEC 60137 Bushings for alternating voltages above 1KV.
IEC 60296 For new insulating oil transformer
EN 50464-4 Endurance test (tank test for hermetical sealed TR.).
3. Environmental conditions
The transformers should be manufactured for the local service conditions as: -
Altitude less than : 1000 meters
Ambient temperature : -5°C to +45°C (50°C as an option)
(35°C monthly average of the hottest month, 25°C yearly average)
Maximum Relative humidity : 95 %
Ministry Of Electricity and Renewable Energy وزارة الكهرباء والطاقة المتجددة
Egyptian Electricity Holding Company الشركة القابضة لكهرباء مصر
EDMS 08- 200- 2 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 22-12-2020
5
4. Voltage ratio
The ratio of the transformers should be (22000)/400v, + 0.5% as a tolerance, 50Hz at no-load.
5. Vector group
The winding connection group of the transformers should be delta on the primary side and star on the
secondary side in accordance with the vector group Dyn11 as specified in IEC60076.
6. Rated power
The transformer should be able to deliver for an unlimited period of time at the main tapping of the
tap changer, the maximum continuous power rating of (25-50-63-100-160-200-300-400-500-630-
800-1000-1250-1500-1600-2000-2500-3000-3500-4000-5000kVA) without exceeding the
allowable temperature rise limit, if the applied voltage is equal to the rated voltage and the supply is
equal to its rated frequency.
7. Tapping range
The transformers should be equipped with 3 phase, 3 wires, and lockable manual off load tap
changer, on the high voltage winding. The tap changer switch is mounted on the tank cover.
The voltage regulation should be affected in seven steps having the following sequences (referred
to input voltage):
Tap No 1 (+5 %)
Tap No 2 (+2.5 %)
Tap No 3 (0 %)
Tap No 4 (-2.5 %)
Tap No 5 (-5 %)
Tap No 6 (-7.5 %)
Tap No 7 (-10 %)
8. Overload capacity
Permissible overload capacity according to IEC 60076-7.
Ministry Of Electricity and Renewable Energy وزارة الكهرباء والطاقة المتجددة
Egyptian Electricity Holding Company الشركة القابضة لكهرباء مصر
EDMS 08- 200- 2 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 22-12-2020
6
9. The Capability of withstanding short circuits
Transformers should be capable of withstanding, without damage, the thermal and mechanical effects
of short circuits at the terminals for 3 sec. duration (S.C. level of 22KV network is 500 M.V.A).
10. Limits of temperature rise
The transformer should be able to deliver its max. continuous ratings, without exceeding the
permissible temperature rise limits:
Top oil level temperature rise 45K
Winding temperature rise measured by resistance method 55K
Hot spot 60 ºC
11. Cooling
Cooling is by natural circulation of oil internal to the transformer and by external air i.e.
ONAN/ONAF (option as per ..EDC requirements).
12. Insulation level
The following test voltages should be applicable to the transformers:
a. High voltage impulse withstand voltages: 125KV for indoor and 145KV for outdoor.
b. Power frequency withstand voltage : 50 KV/ 1 minute
c. Low voltage Power frequency withstand voltage: 3 KV /1 minute
13. Impedance voltage
The impedance at mid-tap should be as follow: at 95 ºC
4 % for transformers (25-50-63- 100-160-200-300-400-500-630 KVA)
5 % for transformers (800-1000-1250 KVA)
6 % for transformers (1500-1600-2000-2500 KVA)
7 % for transformers (3000- 3500-4000-5000 KVA)
14. Bushings
Bushings are of porcelain and generally comply with the requirement of IEC60137.
The minimum creepage distance should not be less than 2 cm/ KV for indoor, 4 cm/KV for outdoor .
The high voltage bushings should be fitted with duplex arc gap set at 65 mm.
Ministry Of Electricity and Renewable Energy وزارة الكهرباء والطاقة المتجددة
Egyptian Electricity Holding Company الشركة القابضة لكهرباء مصر
EDMS 08- 200- 2 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 22-12-2020
7
For transformers with a rating from 500 KVA and higher, the low voltage bushing should be provided
with copper flags and for transformers with ratings starting from 300 KVA, the low voltage bushing
should be provided with suitable copper bars or copper flag.
MV bushings should be labeled U, V, W by using indelible black color paint on the tank cover (rivet
metal). Phase identification by adhesive stickers is not acceptable.
L.V bushings should be labeled u, v, w by using indelible black color paint on the tank cover (rivet metal).
Phase identification by adhesive stickers is not acceptable.
For outdoor transformer (Option as per ...EDC requirements) the surge arrestor (gap less than metal
oxide) 10KA, 24KV max. continuous operating voltage 20KV ± 5% (leakage pass 4cm/Kv at least)
should be installed with medium voltage bushing.
15. Core
The core should be made of low loss steel lamination which are made of cold rolled grain oriented,
annealed, high permeability, non-ageing, silicon steel type .
The lamination should be insulated with suitable varnish or paint, solid insulation is not
acceptable.
The core, framework, clamping arrangement & general structure should be mechanically robust to
withstand any shocks to which they may be subjected during transport, installation, service &
faults.
The core construction should provide efficient cooling of its internal parts.
The core joints should be properly interleaved, precautions should be taken to keep the noise a level
as shown at table -1, according to rated capacity and at measured distance of 1(one)meter, at mid
tap & no-load & eliminate vibration in the core when loaded & to diminish harmonic voltage as far
as possible especially the third harmonics.
Ministry Of Electricity and Renewable Energy وزارة الكهرباء والطاقة المتجددة
Egyptian Electricity Holding Company الشركة القابضة لكهرباء مصر
EDMS 08- 200- 2 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 22-12-2020
8
16. Windings
The winding conductors should be made of the best quality, high conductivity electrolytic copper,
complying with the requirements of the IEC publication max. flux density in the yoke should not be
more than 1.6 tesla.
The windings should be clamped effectively so that they withstand shocks and vibrations during
transport and forces produced by the most severe short circuit currents as indicated in item “9” of
this specification.
17. Transformer oil
The oil should be as per latest revision of specification EDMS 25-401-1
18. Oil expansion conservator
It should be made of sheet steel with an adequate capacity to allow for the extreme changes in the
oil level e.g. when the transformer is off circuited at 0ºC and when the transformer is full loaded at
45ºC ambient. The quantity of oil should be plainly marked on the conservator. The conservator
should be provided with oil level indicator (sight glass at low voltage side), dehydrate breather with
orange silica-gel, oil filling and drain plugs and a connection pipe for connecting the oil to the
transformer.
19. Tank
The transformer tank should be made of best quality plate steel with bolted cover fitted with
neoprene cork seals suitable for temperatures as specified in this specification. The tank should
be rigid enough to withstand the mechanical stresses due those occurring during transformer
lifting and transport, without deformation and also due to effects of S.C. inside the transformer.
Radiators should be welded to the tank.
If the transformer is hermetically sealed (option as per …EDC requirements)
The tank should have sufficient expansion for oil breath, and should withstand an internal
presser of 30 KN/m2
The transformer tank can be hermetically sealed by means of a nitrogen cushion.
20. Accessories
1- Drain plug complete with control tap
2- Welded lifting shackles
Ministry Of Electricity and Renewable Energy وزارة الكهرباء والطاقة المتجددة
Egyptian Electricity Holding Company الشركة القابضة لكهرباء مصر
EDMS 08- 200- 2 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 22-12-2020
9
3- Tank earthing, two M 10 stud with nut washers should be used.
4- Dial thermometer for oil temperature indication reading with a range 0-120°C (with two
contacts)
5- Buchholz relay with alarm and trip contacts. (for ratings ≥ 500 KVA)
In the case of hermetically sealed transformers, the following should be installed:
Pressure Relief valve (PVR).
A vent should be provided to prevent rupturing of the transformer. This should be capable of
withstanding the variations of pressure in normal service.
DGPT2 device.
21. Wheels
The enclosure base should be fitted with 4 wheels (bi-directional) to facilitate moving of the
transformers during installation in two perpendicular directions. Wheels should have a locking
facility to secure the transformer in its position.
22. Name plate
Transformer serial No. and rated power should be engraved on tank cover at LV side. Each
transformer should be fitted with a name plate of weather proof materials fitted in a visible
position, showing the information listed below. Entries on the plate should be indelibly marked by
etching or engraving:
a) Manufacturers serial number
b) Year of manufacture
c) IEC Codes.
d) Customer (...EDC) P.O No.
e) Cooling type.
f) Type: Conventional /Hermetically Sealed.
g) Number of phases
h) Rated power
i) Rated frequency
j) Rated voltages
Ministry Of Electricity and Renewable Energy وزارة الكهرباء والطاقة المتجددة
Egyptian Electricity Holding Company الشركة القابضة لكهرباء مصر
EDMS 08- 200- 2 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 22-12-2020
10
k) Rated currents
l) Vector group
m) Impedance voltage
n) Type of oil
o) Total weight / Weight of oil
p) Connection diagram
q) Short circuit duration
r) A table giving tapping voltages of the positions
23. Transformer losses
The transformer should be designed for minimum losses, when comparing between different
tenders, the present worth value of the annual capitalized cost of guaranteed losses in the
transformers should be added according to the following formula: -
P. w = K x 8760 x C [Wi + (LS.F)( P2 )Wcu ]
Where
K = Present worth factor (L.E)
K = ((1+i)N -1) / i (i+1)
N )
i: latest interest rate from Central Bank of Egypt.
N: number of years. (20 years)
C = Cost of KWH. (According to the max commercial cost of KWH and can be adjusted as
per EEHC latest update)
LS.F = Loss factor for the load = 0.4.
Wi = Iron losses in KW at rated voltage and main tapping
Wload = Load losses in KW at full load and 95ºC.
P = Peak load (P.U.) = 0.8.
The values of the required losses are attached in table (1)
Ministry Of Electricity and Renewable Energy وزارة الكهرباء والطاقة المتجددة
Egyptian Electricity Holding Company الشركة القابضة لكهرباء مصر
EDMS 08- 200- 2 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 22-12-2020
11
24. Penalty and rejection
24-1 Rejection of Material:
If during inspection tests at the works attended by the customer representative engineer any
material is found to be defective or not manufactured according to the specifications agreed upon
the customer representative engineer have the right to reject such material if he is not convinced
that it can satisfactorily be repaired. In such case the contractor should be obliged to replace the
defective material without being entitled to any extra payment whatsoever or to any extension of
time of completion of contract.
24-2 Penalty and Rejection for Decreased Efficiency
The contractor should keep the No load losses and load losses and to be within the guaranteed values,
should the loss values, measured from the works tests, exceed the allowable tolerances in the IEC
or approved equal standards, then the customer representative should have the right to reject the
transformer with such losses.
However, the measured losses deviate from the guaranteed figures, but lie within the allowable
tolerances (10 % total losses), then the excess losses should be evaluated as per the following
formula and the contractor should be penalized accordingly.
P. W = K x 8760 x C [dwi+ (LS.F) (P2) dwcu] LE
Where
K = Present worth factor (L.E)
K = ((1+i)N -1) / i (i+1)
N )
i: latest interest rate from Central Bank of Egypt.
N: number of years. (20 years)
C = Cost of KWH. (According to the max commercial cost of KWH and can be adjusted as
EEHC update)
LS.F = Loss factor for the load = 0.4.
Wi = Iron losses in KW at rated voltage and main tapping
Wload = Load losses in KW at full load and 95ºC.
P = Peak load (P.U.) = 0.8.
Ministry Of Electricity and Renewable Energy وزارة الكهرباء والطاقة المتجددة
Egyptian Electricity Holding Company الشركة القابضة لكهرباء مصر
EDMS 08- 200- 2 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 22-12-2020
12
No credit should be given for any decrease in the value of loss(es) below the guaranteed.
24-3 Replacement of Rejected Material and Equipment
If according to the above articles, any material or equipment is rejected, the contractor should be
obliged to replace it without extra payment.
25. Transformer testing
Customer representative has the right to send its representative to attend any or all of these tests.
Testing dates should be advised by the contractor to permit witnessing by Customer representative
(s). test certificates should be sent to customer representative.
A. Type tests:
These tests should be carried out on one transformer for each type in accordance with the
requirements of IEC standards for transformers, these should include the following:
1- Full wave lightning impulse voltage withstand test. IEC 60076
2- Temperature rise test. IEC 60076
3- Noise level measurement IEC 60551
4- Radio influence voltage measurement IEC 60437
5- Winding insulation requirement ASTM-D-202
6- Tests on bushings IEC 60507
B. Routine Tests:
These tests should be applied on each transformer in accordance with the requirements of IEC
standards for transformers, these should include the following routine tests:
1- Measurement of d.c. winding resistance. (the allowable deviation in the dc resistance value
between phases should be less than 5% at high voltage side and should be less than 10% at
low voltage side)
2- Turns ratio and polarity check or vector-group symbol at all tap positions. Bushing positions
must have permanent markings at this stage of production.
3- Measurement of impedance voltage
4- Measurement of load losses.
Ministry Of Electricity and Renewable Energy وزارة الكهرباء والطاقة المتجددة
Egyptian Electricity Holding Company الشركة القابضة لكهرباء مصر
EDMS 08- 200- 2 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 22-12-2020
13
5- Measurement of No-load losses.
6- Induced over voltage withstand test.
7- Separate – source power frequency voltage withstand test.
8- Electrical oil tests.
9- Insulation tests between windings and earth and between winding each other (absorption
factor (R60/R15 > 1.3)).
R60: insulation resistance at 60 second.
R15: insulation resistance at 15 second.
C. Special Tests:
Special tests should be made in accordance with the requirements of IEC and EN standards for types
of transformers those have not yet supplied or for transformers those have delivered but their
design is modified, these should include and not limited to the following:
1- Short circuit test
26. Instruction manuals
The bidder should be supply with shipment of the transformer complete installation, operation and
maintenance instruction/manuals suitable for the specific item(s) being supplied, including
information from the manufacturer of each purchased accessory.
It should include interconnected diagrams, drawings and instructions describing procedures for items
that will be shipped to be assembled and interconnected for operation when installed.
These should contain strict instructions as required for carrying, moving by skidding or rolling, and
lifting the transformer and accessories.
The manual should include the instructions for tap changing, enclosure assembly, disassembly,
temperature indicator reading, setting procedures and other information designed to assist in proper
operation and periodic maintenance of the equipment being supplied.
Key interlocking should be identified, and serial number should be supplied.
All manuals, instructions and supporting drawings and parts lists supplied by the manufacturer and
supplemental instruction and data supplied by accessory manufacturers should be in English,
clearly readable and arranged in such format to make the subject items easily identifiable.
Ministry Of Electricity and Renewable Energy وزارة الكهرباء والطاقة المتجددة
Egyptian Electricity Holding Company الشركة القابضة لكهرباء مصر
EDMS 08- 200- 2 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 22-12-2020
14
27. Drawings
Bidder should supply a complete set of “as manufactured” drawings and wiring diagrams
including interconnection diagrams of all components and assemblies of the equipment which
assist in operation and maintenance of the equipment.
All drawings should be compatible with current industrial standards and good industrial practice.
All information should be in English language, clearly readable, with IEC standard symbols,
device model, numbers and other requirements.
All Dimensions should be in centimeters.
28. Spare parts (option as per ...EDC requirements)
Tender should contain a list of recommended needed spare parts.
29. Warranty
The manufacturer should warrant the oil distribution transformer to be free from defects in both
material and industry for period of 12 months from the time of operation or 18 months after
delivers to ……EDC
In case of supplying for the first time, the warranty should be 4 years starting from delivery date.
Ministry Of Electricity and Renewable Energy وزارة الكهرباء والطاقة المتجددة
Egyptian Electricity Holding Company الشركة القابضة لكهرباء مصر
EDMS 08- 200- 2 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 22-12-2020
15
30. Max. permitted power losses of transformers (at 95ºc)
Noise Level
dB
% Z
(Tolerance
±10%)
load losses (W)
at 95ºC
No load losses
(W)
at 400 V
Power
(KVA)
45 at 1m. 4 650 60 25
45 at 1 m. 4 875 90 50
46 at 1 m. 4 1260 113 63
46 at 1 m. 4 1505 145 100
47 at 1 m. 4 2170 210 160
48 at 1 m. 4 2520 262 200
48 at 1m. 4 3815 403 300
50 at 1 m. 4 4638 430 400
52 at 1m. 4 5460 510 500
52 at 1m. 4 6430 600 630
54 at 1m. 5 7700 650 800
54 at 1m. 5 9450 770 1000
56 at 1m. 5 11700 950 1250
56 at 1m. 6 13860 1140 1500
56 at 1m. 6 14900 1200 1600
52 at 3m. 6 15750 1450 2000
53 at 3m. 6 16300 1750 2500
54 at 3m. 7 19750 2100 3000
55 at 3m. 7 22850 2450 3500
56 at 3m. 7 25950 2800 4000
57 at 3m. 7 31500 3500 5000
N.B.
It is necessary to add a valve with a tap to each transformer to get an oil specimen for testing.
31. Guarantee table
The attached guarantee table should be duly completed, signed & submitted with the offer.
Ministry Of Electricity and Renewable Energy وزارة الكهرباء والطاقة المتجددة
Egyptian Electricity Holding Company الشركة القابضة لكهرباء مصر
EDMS 08- 200- 2 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 22-12-2020
16
GUARANTEE TABLE DISTRIBUTION TRANSFORMER
22 / 0.4 KV
1- Manufacturer
2- Type
3- Standard specification
4- Rated output at 45ºC ambient (KVA)
5- Method of cooling
6- Oil type
7- System of connection
8- Material of insulation
HV winding ـ
LV winding ـ
Major insulation ـ
9- Material of core and its cross-section area (mm²)
10- Max. core flux density at full load (tesla)
11- Turns ratio
12- No load losses (watts)
13- load losses at full load current and 95ºC winding temperature (watts)
14- Resistance per phase at 95ºC For primary (ohms)
For secondary (ohms)
15- Cross-sectional area of cu windings For primary (mm²)
For secondary (mm²)
16- Permissible symmetrical S.C current at L.V side terminals for 3 sec (KA)
17- Primary voltage at normal tapping (volts)
18- Permissible overload duration without change of specified temp. rise
according to IEC 60076-7
yes [ ]
no [ ]
19- Full load current at LV side (Amps)
Full load current at HV side (Amps) ـ
No load current at LV side (Amps) ـ
Ministry Of Electricity and Renewable Energy وزارة الكهرباء والطاقة المتجددة
Egyptian Electricity Holding Company الشركة القابضة لكهرباء مصر
EDMS 08- 200- 2 EEHC DISTRIBUTION MATERIALS SPECIFICATION
Date: 22-12-2020
17
20- Impedance voltage ( % )
21- Temperature rise at rated output above 45°C ambient temperature
A- At oil top level (°C)
B- Winding temperature (°C)
C- Core temperature (°C)
22- Tapping switch (on H.V. Side)
No. of steps ـ
( % ) Value of the step ـ
23- Medium voltage insulators
Length of leakage (mm) ـ
Arc gap (mm) ـ
24- Means for firmly bracing of trans.Winding to avoid loosening them due to S.C
25- Transformers should be complete with all accessories in tendered specifications yes [ ]
no [ ]
26- Transformers should be manufactured according to standards mentioned in
tendered spec. and will satisfy all requirements in tender specifications
yes [ ]
no [ ]
27- Tender specifications are attached with our offer and each page is signed
by us
yes [ ]
no [ ]
28- Overall dimensions (Length x Width x Height) ( mm x mm x mm)
29- Total weight of trans. With oil (kgm)
Weight of oil (kgm)
30- Noise level (db.)
31- Color of silica gel
N / B:
1- No offers should be considered unless attached with both above guarantee table dully
completed and signed for each size of trans. and also our tendered specifications with
all pages signed by tenderer.
2- Tenderer should sign “√” in front of yes or no in the above guarantee table.
I/we guarantee the correctness of above data for transformers we are offering to Customer
Company for Distributing Electricity.
Signature of tenderer: …………….. Date: / /