7/25/2019 Technical Comparison of Cahors vs Conventional Trfo_final

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Release no. 001 / Rev 0

Medium Voltage Division

Sr.NoCLASSIFI

CATIONPARAMETER

CONVENTIONAL OIL FILLED

TRANSFORMERS

CAHORS - HERMETIC

TECHNOLOGY MAINTENANCE

FREE OIL FILLED TRANSFORMER

BENEFITS / REMARKS

1 ConventionalHermetic Technology with non- gas

cushion

2 With Breathers & Conservators Without Breathers & Conservator Compact

3Possiblilty of Oil

Contamination with Air

YES. High Exposure to Oxydation

phenomenon due to Breathing

Technology

NO. Totally Airtight

Oil BDV get maintained @ required value & all

oil properties remains unchanged for entire

life of Transformer. Hence No maintenance.

4Oil filtration during pre-

commissioning & chargingRequired Not Required

Saving of MAN-HOURS, Cost & free from any

contamination. Ready to charge product.

5Oil Filtration & Oil TOP up

for preventive maintenanceRequired Not Required

Since no preventive maintenance required,

hence no need of any shut down, DG

operation. Hence cost saving & interruption

free operation of transformer.

6 Radiators Corrugated Fins

Compact. No need of any accessories fitting at

site i.e. conservator & detachable radiator

fitting. Further no need of Oil top up from

Spare oil of 10% which is suppplied in case of

conventional design.

7In Radiator, oil flow for cooling through

inlet & outlet nozzle only

Corrugated fins are attached directly to

main tank where cooling is faster &

better

Provides higher surface area for cooling with

effective faster cooling. i.e. Better Heat

dissipation. This enhances the efficiency of

Transformer.

8Oil need to undergo flow process for

achieving the cooling

Oil undergo emerge process for

achieving the coolingSuperior

9 Chemical Ageing Yes. Faster Extremely Slow

No adverse effect of external environment.

Hence Transformer gets Healthy working

operational condition.

10 Noise Level

High. Approx. > 60 dB as a operational

noise. (As per NEMA standard, its max

value is 65 dB)

Low. Approx.between 45 dB to 57 dB as

a operational noise. (As per NEMA

standard, its max value is 65 dB)

Low Noise & hence no disturbances by

transformer to external faculties.

11 Spare Requirement of oil Required for Preventive maintenance Not RequiredSpace saving of storage of Oil barrels & saving

on cost of spare oil.

12OIL BDV level with ageing

effectReduces faster Reduces very slow

Enhance the life of transformer from 20 years

to 30 years without any maintenance

13 Insulating Material Craft PaperEpoxy Diamond dotted paper for winding

& Polymide material forcoils.

It donot allow to produce any sluges in OIL &

donot give any agening effect. Hence provide

better & reliable insulation to inter turn

winding.

14 Gasket Rubber Cork Nitrile Gaskets i.e.NBR

It donot get cracks on high temprature &

hence survive with even continuous high temp

as well. It has longer life of 30 years compare

to Rubber cork gasket of 1 or 2 years.

15 Oil Leakage Possibility

YES, due to conventional design of

Detachable radiators, welded Tank &

gasketing structure.

Thanks to hermetically Sealed design, No

possibility of Oi leakage

Hence no need of spare oil, no need of any

shut down for atttending the oil leakage

complaint & saving of man, material & money.

16 Partial Dischare it is not partial discharge free Partial discharge free

Losses maintains to the actual designed values

for the complete life, unlike to increase the

losses after few years of service. This will give

Error free & maintenance free operation as

well.

17On higher side (conventional losses &

conventional designed)

Onlower side for standard Design &

available with STAR 3 rating, certified by

BEE

Reduces Electricity bill values & provides

higher efficiency to the product.

18Losses get increased with its operational

life

Losses remain steady with its operational

lifeUniform operation throughtoout the life.

19 Size Bulky due to conservator & RadiatorCompact by almost 30% as compared to

others thanks to corrugated FinsSaving of space at site.

20 Product expectedLife 15-20 Yrs 25-30 yrs Enhances the life of product

CONFIDENTIAL COPY

TRANSFIX INDIA Pvt Ltd

Technical Comparison Document(Conventional Oil filled Transformer Vs. CAHORS Hermetic TYPE Oil filled Transformer)

Technology

Cooling

Losses

TEC

HNOLOGY

PRODUCT

7/25/2019 Technical Comparison of Cahors vs Conventional Trfo_final

2/2

Medium Voltage Division

Sr.NoCLASSIFI

CATIONPARAMETER

CONVENTIONAL OIL FILLED

TRANSFORMERS

CAHORS - HERMETIC

TECHNOLOGY MAINTENANCE

FREE OIL FILLED TRANSFORMER

BENEFITS / REMARKS

21 Accessories for protection

Separate mounting Arrangement

required for OTI, PRV, Bukhlolz, etc for

protection.

Integrated in single instrument i.e. DGPT

2 -Protection device

Limit the no. of cut out to Tank & provides

smoother function though one device instead

of group of device.

22 SafetyLack of safety due to oil leakages &

further chances of fire explosion due to

low fire point

100% safety as no contact of oil with

external wheatherconditions & No

leakages. Also available with high flash

point of 135 Deg C. We can also supply

oil with higherflash point upto 370 Deg

C instead of standard oil at anextra cost.

Provides Safe & Reliable operation

23Short Circuit Withstand

CapacityLow dueto circular coil shape

High. Thanksto Oblong shape of

Winding to have better axial & radial

forces sustainability

Provides Rigid design to withstand different

abnormal supply & load conditions.

24 DESIGN Compliance IS 2026 IS 2026

25 Theft Possibility Theft of Oil, copper & core is possible

Not easily possible due to Hermetic

Technology where, many safety

interlocks are available in our

technology, which can be shown during

factory visit

Not easily accessible for theft of Oil & copper

in case of small ratings of transformer upto

400 KVA

26 MaintenanceEvery 3 years Maintenance + Oil

Replacement for entire lifeMaintenance free for entire l ife Saving of Man, Material & Money

27 Failure Rate failure rate < 5.6 % as per utility High reliability ( failure rate < 0.1 % ) Highly reliable & trusted by our customers

28Adds cost on MSEB bills due to high

lossesSaves over other transformers

29 Adds cost on Frequent Maintenance Saves 100% on this parameter

30Adds Oil Replacement & oil filtration

Cost Saves 100% on this parameter

31 Adds Overhead Cost Saves 100% on this parameter

32 Aesthetic LookConventional look with a Bulky size with

poor Paint finish likely to rust

Modern, compact & aesthetically sound,

Paint with mini 1000hrs SaltSpray

resistance

Long lasting paint shade which servives 30

years of rust proof services.

33 Handling & Installation

Difficult since detachable radiators, Oil

Barrel & their assembly at site which

lead to time & money involvement

Easy, as its a ready to charge product

without any detachable parts & loose oil

Ready to charge product without any site

activities i.e. Fitting, Oil top up etc. Hence

reduction of installation cost as well.

34 Return on investment (ROI) NIL

High. The cost of transformer gets

recovered thanks to all above mentioned

economical benefits (savings).

Competitive intial cost & negligible running

cost. Hence completely economical & ROI

product.

CONFIDENTIAL COPY

Product Photo

TRANSFIX INDIA Pvt Ltd

Saving of Man, Material & Money

Astethically Sound to deliver modernization &

technology upgradation.

Note: This document is mainlyfor general comparison and knowledge sharing purpose

only . To know more about any point can be shared in details separately.

35

Economical Benefit

Technical Comparison Document(Conventional Oil filled Transformer Vs. CAHORS Hermetic TYPE Oil filled Transformer)

GENERAL

PROTECTION