INVEX Transformer Oil Regeneration System

Enhancing Transformer Efficiency & Longevity

Invexoil, using advanced technologies in the design and manufacture of transformer oil regeneration units, offers customized and effective solutions for restoring the quality of used oils in power and industrial transformers. Our units are fully designed following the IEC 60296 standard to regenerate transformer oils, ensuring optimal performance and quality, and making them suitable for reuse.

Features and Capabilities of INVEX Transformer Oil Regeneration Units

Oil Quality Recovery According to IEC 60296 Standard: Invexoil’s transformer oil regeneration systems utilize advanced filtration and separation techniques to restore transformer oil to its original quality as per IEC 60296. This process removes contaminants, suspended particles, moisture, and dissolved gases, enhancing the oil’s dielectric properties.

Chemical Property Improvement of the Oil: Invexoil’s regeneration units are capable of improving the chemical properties of the oil, including acidity, surface tension, tangent delta, breakdown voltage, and other essential characteristics according to required standards. This process enhances the oil’s performance and extends the lifespan of electrical equipment.

Design and Manufacturing in Various Capacities: Invexoil’s transformer oil regeneration systems can be designed and manufactured in various capacities to meet the specific needs of each project and equipment. These systems are effectively suitable for both small and large transformers across various industries.

Online Operation Without Transformer Shutdown: The transformer oil regeneration units by Invexoil are designed to operate online, meaning they can regenerate oil without the need to shut down the transformer. This significantly reduces downtime and operational disruptions.

Trailer or Container Mounting: These systems can be installed on trailers or inside containers, facilitating quick movement and easy deployment at various sites.

  • Reduction in Operational Costs: By regenerating oil instead of replacing it, operational costs are significantly reduced.
  • Extended Transformer Lifespan: Regenerating and recovering the oil’s chemical properties helps reduce transformer failures and prolong its operational life.
  • Environmental Impact Reduction: This process contributes to the reduction of waste oil disposal and helps minimize environmental pollution.
  • High Performance in Harsh Conditions: The regeneration systems perform effectively across various operating conditions in industries such as energy, oil, gas, petrochemicals, and steel.
  • Customizable to Needs: The units can be adjusted to handle various flow rates and operating pressures, ensuring compatibility with the specific conditions of each transformer.
  • Quality and Performance Assurance: With adherence to international standards and the use of advanced equipment, Invexoil’s transformer oil regeneration systems restore the oil quality to the required specifications, ensuring the health and optimal performance of the transformer.
  • Automatic Systems: The regeneration units are fully automated, minimizing the need for manual intervention.
  • Recover Oil Quality
  • Environmentally Friendly
  • European Quality
  • Cost-Effective
  • 2-Year Guarantee
  • 15-Year Sales Services

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Main components

• Heaters
• Inlet strainer
• Treatment columns
• Inlet/outlet gear pump
• Foam sensor on vacuum chamber
• Condenser or water trap
• Temperature/pressure controller
• Bypass
• Drive system to control oil flow rate
• Inlet/outlet filter
• Oil level controller
• Vacuum pump
• Vacuum booster
• Processing vacuum chamber
• Liquid sensitive sensor inside water trap
• Vacuum valve (for evacuation and dry out)
• Protective plastic pipes for storing the hoses
• Emergency stop
• Alarms
• Inlet/outlet sampling ports
• Interlocks
• Back washing pump
• Phase correction key

Optional Equipment
• Trailer
• Moisture meter
• Control room
• Lab instruments

INVEXOIL Transformer Oil Regeneration Systems' Specification
Model Capacity (lit/h) Oil Heater (kW) Vacuum Pump (M3/h-1 cfm) Roots Booster (M3/h-1 cfm) Oil Pump (kW hp) Supply Required Amps (380V) No. of Columns Pipe Size (inch) L / W / H Weight (kg)
Invexoil - TOR 2 200 8 6 - 3 (4) 25 2*1 1/2" 3500*1800*2450 3000
Invexoil - TOR 5 500 12 25 - 3 (4) 30 2*2 3/4" 4500*2200*2450 4800
Invexoil - TOR 10 1000 24 40 - 4.5 (6) 45 2*3 3/4" 4500*2200*2450 6500
Invexoil - TOR 20 2000 30 60 150 (Optional) 4.5 (6) 55 2*6 1" 6000*2200*2450 8500
Invexoil - TOR 30 3000 48 80 150 (Optional) 4.5 (6) 85 2*9 1 1/4" 7500*2200*2450 9000
Invexoil - TOR 40 4000 54 100 250 7.5 (10) 100 2*12 1 1/2" 9000*2400*2450 10500
Invexoil - TOR 60 6000 63 160 500 7.5 (10) 125 2*18 1 1/2" 9200*2400*2450 13000
Invexoil - TOR 80 8000 96 190 500 13 (17.5) 170 2*26 1 1/2" 10000*2400*2450 14500
Invexoil - TOR 100 10000 120 270 1000 15 (20) 220 2*30 2" 12200*2400*2450 17000
INVEXOIL Transformer Oil Regeneration Systems' Performance Analysis
Test Description Method Unit Initial Condotion Invexoil 5000 Single Pass Quality
Acidity IEC 296 Mg KOH/g 0.25 < 0.3
Color Appearance - Visual Brown/Cloudy Clear Light Yellow
Breakdown Voltage IEC 156 KV <30 < 70
Moisture IEC 733 Ppm < 2000 5
Tan Delta (90' C) IEC 247 - < 0.01 < 0.005
LFT ASGTM Dynes/cm <15 > 35
Gas Content GC % V/V 8 0.01
Oxidation Stability IEC 74164 hrs - Depleted Restored
Process Description
 
Regeneration of transformer oils is needed when the transformer oil has deteriorated to a level whereby regular oil purification) degasification & filtration are no longer adequate. The regeneration or reclamation process requires passing the deteriorated transformer oil through an adsorbent. Sample oil will have to be taken and tested before regenerating transformer oil.  The results of the test sample will provide an estimate of the duration of the regeneration and its parameters, but the gas analysis will determine whether the transformer can be tested in the energized (Invivo) or de-energized state.
 
1) Energized (Invivo)
 
In order not to create turbulence, the least flow rate is used with an energized transformer, which is variable depending on transformer size. The number of cycles is dependent on the degree of contamination (acidity, sludge, color), etc. 
 
2) De-energized 
 
Turbulence is such an important factor with de-energized transformers and consequently, the oil flow rate through the system can be increased to a maximum rate. The number of cycles is dependent on the level of oil contamination. 
 
Desludging Methods
 
Desludging takes place at a higher temperature than oil regeneration. The two most important criteria for desludging to take place are:
 
 – The temperature of the oil in circulation through the transformer must be over its aniline point of about 78′ C, to dissolve sludge.
 – Oil supplied to the transformer during circulation must be regenerated to dissolve and absorb sludge.
 
1) Energized (Invivo)
 
This process is very efficient and is aided by the slight mechanical vibration and heat generated by the energized transformer. Between 2- 20 passes may be necessary to complete the task depending on the level of oil contamination. 
 
2) De-energized 
 
Less efficient than the Invivo method and desludging takes longer, depending on the size of the transformer.
 
3) Tank to tank regeneration:
 
To utilize the catalyst to the best efficiency, flow should be reduced to 20-25 % of the nominal (full) flow.
 
An operator has the choice of two separate operating conditions in which he may treat the oil, purification, or regeneration. This decision is based on oil analysis done before the processing of the oil. Operating temperatures and flow rates must also be determined, and these decisions are determined by the type of application and the degree of contamination as determined by earlier oil analysis. Regardless of which process is chosen, the oil is pumped from the bottom of the transformer through the system and returned to the top of the unit after being treated The Invex system is connected by hoses to the transformer in a loose arrangement, and the entire system including hoses, is filled with oil before processing is initiated. Once the system is filled, the oil is automatically re-circulated for a minimum of 10 minutes through the inlet and outlet hoses to ensure that all air is eliminated from the system. A set of manual air eliminators and several automatic valves are located near the transformer to provide safe and reliable re-circulation, the oil in the transformer is ready to be processed. 
 
Regeneration
 
Regeneration operating condition consists of two phases: 
 
1)Processing phase In this process, the oil is regenerated by forced percolation through columns at about 65ºC. After regeneration, the oil is pumped through a 1-micron-rated filter before it is degassed.   Degasification and dehydration of oil occur within the vacuum chamber. The processing duration depends on the quality of the oil being treated. 
 
2) Reactivation phase After having circulated a nominal quantity of oil, the catalyst beds are quite saturated with contaminates absorbed from the oil and their efficiency drops off sufficiently to justify reactivation. The catalyst is reactivated in the reactors and a small quantity (0.1 % of oil processed) of oily scum is collected in a holding tank before being drummed for resale and reprocessing or waste disposal.   
 
Controls & Instrumentation
 
The operator can monitor and control all aspects of the operating system. All pertinent operational data and events are displayed and logged in real-time.  The application offers an alarm system to alert the operator to critical events. 
 
Operator Requirements
 
Two operators are required for system set-up. Once the system is engaged only one operator is required to monitor the system. The operator only requires 2 to 4 hours per 24-hour period of manual labor. 
 
Oil interfacial tension according to ISO6295- ASTMD971  
 
• Surface tension is the cohesive forces between oil and water molecules.   The surface tension of the new oil should be 40 Mn/m. Low surface tension may be the result of some impurities such as chemical contaminants or some polar compounds. 
 
Stability against oxidation according to IEC61125-IEC60296 
 
• This test is done to determine the level of sludge, acidity, and tan delta of oil. About 25 gr of oil is exposed to a copper ring at 120′ C. The test duration is different depending on the oil type. (without antioxidant: 120 h, with antioxidant: 500 h). The oil viscosity is measured according to ISO- 3104 ASTMD 445. 
 
Oil pour point according to ISO 3016
  
• The oil pour point is the temperature at which it becomes semi-solid and loses its flow characteristics. 
 
Powerful Solutions for

a Sustainable Future

INVEX’s Transformer Regeneration System offers a comprehensive onsite oil regeneration solution in energized and de-energized transformers. This machine, mounted on a truck or sea freight container, excels in degassing, drying, and particulate removal and eliminates acidity, sludge, and other oil decay products. Our unique catalyst reactivation process allows for repeated use of the same catalyst, significantly reducing waste and environmental impact. Explore our advanced high vacuum de-gasification technology, particulate filters, and automated reactivation process to enhance your transformer maintenance. For more details on our oil regeneration process, system components, and environmental benefits, don’t hesitate to get in touch with our team.

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