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TRANSFORMER OVERHAULING SERVICE
SHILPA TRANS-CARE PVT LTD
CONTACT US:- SHILPA TRANS-CARE PVT LTDNr Gayarti tample, Makarpura GIDC Vadasar RD. Vadodara.M. 9898259056, 7874637981EMAIL ID : [email protected]
TRANSFORMER OVERHAULING Over all scope of work:-
Transformer Routine testing Buchholze Relay Servicing and testing
OTI /WTI testing and calibration Radiators maintenance
Conservator Tank maintenance Oil Treatment
Main tank and cover maintenance OLTC Maintenance
Active part Maintenance
Transformer Testing
We are providing routine site testing before and after overhauling to ensure Improvement of transformer performance and quality. Routine testing of transformer gives us a brief idea about its internal heartiness and efficiency. We are providing all tastings with suitable approved and calibrated testing equipments and appropriate method as per Indian standards. We are providing approved testing certificate which is suitable for local energy suppliers like GETCO, MSEB.. Etc.
Sr.No Name of Testing Purpose of Testing
Before Overhauling After Overhauling
1 Voltage ratio test To check present Voltage regulation To check Improvement in Voltage regulation
2 Magnetic balance test To check present flux distribution in core.
To check Improvement of flux distribution in core.
3 Vector Group To verify Vector Group of Transformer
4 IR & PI value Test To check present winding insulation resistance value.
To check improvement in winding insulation resistance
value.
Buchholze Relay Servicing and testing
Buchholze relay is known as heart of transformer it is mounted in between transformer main tank and conservator tank, its function is to give alarm and tripping due to air lag in it at time of fault generation. Healthiness and effectiveness of Buchholze relay is most important. We are providing following services regarding Buchholze relay in overhauling process to improve its life and service.
Sr.No Service Benefit
1 Gasket replacement of Buchholze relay top and bottom joint.
To avoid oil leakage from joint.
2 Gasket replacement of air realized and oil drain plug
To avoid oil leakage from air realized and oil drain plug.
3 Testing of mercury switch To check healthiness of Buchholze relay
4 Tightening of internal connection stud To prevent if from sparking.
5 Checking of Buchholze relay protection system
a) To ensure healthiness of protection system of Buchholze relay including circuit breaker,
enunciator and indicators.b) Physical Checking of control cable to prevent
from earth fault and leakage.
OTI /WTI testing and calibration OTI/ WTI are use for measurement of oil and
winding temperature respectively. Precision in temperature indication is depends on healthiness of OTI and WTI meters. We are providing our finest services during
overhauling to improve its effectiveness and efficiency. OTI and WTI gives signal of alarm and trip signals to protection system at the time of temperature rise beyond its set value.
Sr.No Services Benefit
1 Calibration of OTI/WTI To ensure its accuracy.
2 Testing of mercury switch To ensure healthiness of mercury switch.
3 Testing of OTI/WTI protection system a) To ensure healthiness of protection system of OTI/WTI including circuit breaker, enunciator and indicators.
b) Physical Checking of control cable to prevent from earth fault and leakage
4 Setting of temperature for alarm and tripping
To prevent transformer from over lading and over heating which are main reasons of transformer failures.
Radiators Maintenance Radiators are most important part of transformer. Proper
designing and provision of radiators improves transformer cooling so ultimate loading capacity and life of transformer improves automatically. Internal cleaning and maintenance of radiators prevents overheating and oil leakage.
Sr.No Services Benefit
1 External cleaning of radiators and all joints. To improve its rusting and dusting resist capacity.
2 Gasket replacement of Air realized and oil drain valve of radiators
To make them free from leakage.
3 Gasket Replacement of Radiators and radiators butterfly valve.
To Make radiators and valve section free from leakage.
4 Replacement of nut bolts if required to provide proper fitting.
5 Internal cleaning of radiators with oil flushing inside radiators.
Conservator Tank Maintenance Conservator tank it self indicates it s role in transformer performance.
Conservator tank is simply use for storage of extra transformer oil that utilized by transformer at the time of heavy loading, what happens actually at the time of loading hot and cold oil gets circulate in transformer via radiators for cooling of transformer . at that time cold oil stored in conservator goes down towards core and winding to make it cool. Silica gel breather is also connected through conservator for cooling so pollution of air and all dust partials also stores in conservator, plus due to that dust partials and transformer oil, inside of conservator tank gets rusted and the whole rust and dust stores in conservator so internal cleaning and maintenance of it is necessary. IN SOME CASE DURING OVERHAULING WE FOUND MORE THAN 5KG OF DUST AND RUSTS IN CONSERVATOR IN 15YEARS OLD TRANSFORMERS.
Sr.No Services Benefit
1 Gasket Replacement of conservator main cover
To prevent it from oil leakage.
2 Internal & External cleaning of with wire brush to remove dust and rust.
3 Gaskets replacement of valves and oil topping flange.
To prevent it from oil leakage.
4 Cleaning and gasket replacement oil MOG
5 Replacement of silica gel breather To provider dry air for transformer breathing.
6 Air cell filling if applicable.
7 Oil level glass and gasket set replacement
Transformer Main Tank & Cover Maintenance
We are provides maintenance services regarding transformer main tank cover as describe below. Main tank cover contains pressure expansion vent which is use full to protect the transformer at the time of un necessary pressure generates inside transformer due to certain fault. We are also provides all HT – LT Bushing cleaning with suitable cleaning material.
Sr.No Services
1 Gaskets replacement of main tank cover
2 Gasket and pressure die farm replacement of explosion vent
3 Gaskets replacement of all valves and air realized plug mounted on tank cover.
4 Cleaning of transformer tank cover with cleaning brush.
Oil treatment
Transformer oil is made up from petroleum distinction. It is mainly carbon composition, so it contains very good insulation and cooling property. But due to dissolution of gases, impurities and continues heating cooling cycle its insulation property gets spoil so its filtration and testing becomes necessary at the interval of quarter or year.
We are providing oil filtration with dual filter high pressure vacuumed machine. We are also providing approved oil BDV and DGA test certificates.
Sr.No Services Benefit
1 Oil filtration with high pressure vacuum filtration machine.
To improve its quality and BDV value.
2 BDV testing before overhauling To identify oil quality before filtration
3 BDV testing after overhauling To check quality improvement after filtration.
4 Oil circulation in transformer via oil filtration machine
To improve IR and PI value of Transformer
OLTC MaintenanceOLTC( Online tap changer) is a addition
chamber of transformer that use for changing output it voltage by interchanging tap position of winding. OLTC chamber gets addition oil and oil storage chamber . Due to operation of OLTC tap changing switch at 11KV sparking and carbon generates on its tap contact and rotating contacts. The generation and lagging of heavy carbon spoils oil quality and ultimate transformer life careless regarding oltc maintenance is a enough reason for transformer failure.
Sr.No Services Benefit
1 Oil filtration of OLTC oil To make oil free from impurities and carbon partials
2 Cleaning and proper thigh ting of OLTC internal contacts
3 OLTC top and bottom inspection window gasket replacements
4 OLTC mechanical and electrical operation testing
5 OLTC to panel wiring checking and maintenance
Core and winding is main part of transformer. we are getting power transfer and voltage regulation due to correct design of active part.
paper insulation is used for coil winding. due to heating of oil carbon particles and surges gets deposited on core and coil portion. That surge and carbon particles increase the load loss ( cu loss) of transformer. During overhauling we removes that impurities via hot oil wash and physical gentle cleaning of core and winding.
Active part Maintenance
Sr.No Services Benefit
1 Hot oil wash of core and coil To make core and winding free from impurities and surge that leads to loss reduction.
2 OFTC contacts cleaning , thigh ting and operation checking and smoothing.
3 OLTC switch gaskets replacements
To make oltc switch free from oil leakage.
4 Physical inspection of winding joints and tapping
conditions and maintenance if required.
To avoid transformer failure and improve transformer life.
5 Thigh ting of core clamps and core tie rods.
6 Gaskets and rubber rings replacement of HV and LV bushings.
Transformer general maintenance & Painting
We are providing quality painting with the help of air gun and compressor. We are providing a high resistance anti corrosive paint to improve metal corrosive resistance. We provides one layer of primer and then after two layer of well known branded paints to make it better and protected from weather conditions.We are providing above mention services in transformer overhauling and remaining
general maintenance work is mention hear: - Sr.No Services
1 Cleaning and painting of transformer tank and cover
2 Cleaning and painting of conservator tank
3 Internal cleaning of transformer tank
4 Cleaning and painting of OLTC (if applicable)
5 Cleaning and painting of radiators.
6 Nut , bolt and washer replacement at every joints where required.
7 Shifting of transformer during overhauling if required.
SHILPA TRANS-CARE PVT LTD
CONTACT US:- SHILPA TRANS-CARE PVT LTDNr Gayarti tample, Makarpura GIDC Vadasar RD. Vadodara.M. 9898259056, 7874637981EMAIL ID : [email protected]
