A Trusted Name in Transformer Oil Filtration / Dehydration Since 1985
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                         Our oil filtration plants are used to remove impurities from Transformer, Reactor, Circuit Breaker and Switchgear oil such as moisture, dirt, air and other gases. This is a “Low Temperature and High Vacuum” principle based equipment as per the International Standards 6034 (1989) and its latest revision. We have filtration plants of variable capacities of 600, 2500 & 7500 LPH.

Filtration Plant

                          The plant takes the impure oil into the system through the inlet ball valve and then pumps it through by a positive displacement pump. A magnetic strainer prior to this removes solid particles up to 1mm size and magnetic particles. After heating the oil up to max. 60 °C, it passes through the Paper filters, where particles up to 5 microns are filtered. After that it passes through the Cartridge filters, where particles up to 1 micron are filtered. A specially designed double stage ultra high vacuum chamber removes moisture, air and all the gases with the help of vacuum less than 0.05 Torr. The oil falls by way of gravity over the media inside forming a thin film of oil, exposing a larger surface area. The dissolved moisture and gases are evacuated and the pure oil goes to the transformer through the outlet pump. Our Filtration systems effectively remove all impurities restoring the oils to a pure grade.

 
Standard Features:
» Double Stage Vacuum Pump & Booster Capable of Pulling Vacuum Down to 0.05 Torr.
» McLeod Vacuum Gauge Range 10 Torr to 0.01 Torr
» Bourdon Gauge (Range: 0 to 760 )
» Variable Frequency Drive For Variable Speed Control
» Inlet Pump Self Priming Positive Displacement Gear Pump
» Inline Digital Flow Meter and Totalizer
» Flanged Dry-Out Connection For Drying Out Internal Paper Windings
» Oil Sample Ports
» 80 meter Sections of Heavy Duty Petroleum Oil Transfer Hose.
» 20 meter Sections of Vacuum Rated Hose For Dry-Out
 
The Unit Consists of :  
» Filter Unit » Imported thermostat
» Indirect system of Oil Heating » Thermometer for measuring temperature
» Vacuum Dehydration / degasification Unit » Pressure & Vacuum gauges
» Optical level monitor to control foam/oil level in degassing chamber » Flow control indicator
» Feed and delivery pump
» Electronic Float Control
» Piping & Valves » Electrical instruments, voltmeters and ammeters
» Control Panel » Electrical overloads and overload releases for safety of motors.
 
 
Evacuation System

                         Transformer evacuation system is used to remove impurities from transformer's core and winding. With this system we can improve the INSULATION RESISTANCE ( I. R. Value). There is no need of Oven, even after repairing the Transformer on site. It can improve the I.R. Value of Transformer from 20 MΩ to > 10 GΩ. This system is also used to remove the Gasses & impure particles from Power Transformers at the time of new Installation or Idle Transformers to get in ready/running condition.

This Evacuation System can be used for 500 KVA to > 500 MVA Transformers sufficiently.

 
Inspection frequently Items to be Inspected Inspection Notes Action required, If inspection shows unsatisfactory conditions
Hourly Ambient Temp. Check that temp. rise is
reasonable
Shut down the transformer & investigate if either is persistently higher than normal.
" Winding Temp.    
" Oil Temp.    
" Load (Amperes) Check against rate figure Note: An improper tap position can cause excessive core loss.
" Voltage    
Daily Oil level Transformer Check against oil gauge If low, examine the transformer for leaks.
" Relief vent diaphragm    
" Dehydrating breather
(silica gel)
Check colur of the active agent If silica gel is pink change by spare charge.
Quarterly Bushing Examine for cracks and
dirt deposits
Clean or replace
" Oil in Transformer Check the Electric strength and water content Take suitable action to restore quality oil
" Dehydrating Breather Check oil level in oil cap
and that air passages are free
Make up oil, required.
Half Yearly      
Yearly or earlier if trans-former can conveniently be taken out for checking Oil in transformer Check for acidity & sludge Filter/Dehydration or replace.
" Insulation Resistance Compare with value at
time of commissioning
Process if required
" Relays, alarms, their
circuit, etc.
Examine relay & alarm contacts & their operation, fuses etc. check relay, accuracy, etc. Clean the components or replace contacts and fuses if necessary. Change the setting if necessary.
" Earth
resistance
  Take suitable action. if resistance is high
3 to 5 Yearly Complete
transformer
Overall inspection
including lifting of core
and coils
Wash by hosing down with clean dry oil. Tighten where necessary.
 
 
 
   
 
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