Transformer Oil Treatment
DC-4.4D Transformer Oil Degassing Machine
The DC-4.4D machine is designed for multiple applications, which involve insulating and cooling oils used in high-voltage electrical equipment, such as transformers, on-load tap changers (OLTC), transformer bushings, and high-voltage switches. The machine performs essential functions, including in particular: heating, pumping, and purification of electrical insulating oils (this process removes solid particles, dissolved gases, and moisture from the oil) and evacuation of transformer tanks (the unit removes air and gases from transformer tanks during servicing or repair when gases may have entered the system).
Description
The DC-4.4D machine is designed for multiple applications, which involve insulating and cooling oils used in high-voltage electrical equipment, such as transformers, on-load tap changers (OLTC), transformer bushings, and high-voltage switches. The machine performs essential functions, including in particular:
- Heating, pumping, and purification of electrical insulating oils
This process removes solid particulates, dissolved gases, and moisture from the oil. - Evacuation of transformer tanks
The unit removes air and gases from transformer tanks during servicing or repair when gases may have entered the system.
Machine design
The DC-4.4D is built within a robust containerized enclosure, which houses all operational components, including:
- Vacuum processing chamber for lowering internal pressure to facilitate degassing.
- Vacuum generation components, including both booster and backing pumps.
- High-performance oil pumps.
- Integrated oil heating system.
- Dual-stage filtration system for removing coarse and fine particulate contaminants.
- Centralized control panel with indicators and operational controls.
Operating modes
The DC-4.4D offers several operating modes to meet different servicing needs:
- Oil Pumping Transfer mode
In this basic mode, the system functions as a transfer pump. Oil passes through the filtration system while being pumped from one vessel to another. - Heating and Filtration mode
In this mode, the oil is first pumped through the heater to raise its temperature. The heated oil is then directed through the filtration stages to remove particulate contaminants. The processed, clean, and heated oil exits the unit ready for use. - Degassing and Dehydration mode
For thorough processing, oil is first heated to 122–131°F (50–55°C) and filtered. The oil then enters the vacuum chamber wherein reduced pressure and elevated temperature work together to efficiently remove dissolved gases and moisture. The chamber contains specialized media intended to maximize the oil surface area, thereby enhancing the water and gas removal under vacuum. - Vacuum Evacuation mode
In this mode, the DC-4.4D is connected via hose to external equipment (such as transformers). The vacuum system then evacuates air from the connected equipment to achieve the required vacuum level.
Specification
| No. |
Parameter |
Value |
| 1 | Capacity, gpm (m3/h) |
4.4 (1) |
| 2 | Max oil outlet temperature in heating mode, °F (°С) |
140 (60) |
| 3* | Processed oil parameters (initial moisture less than 100 ppm):
— filtration, μm — minimum dielectric strength, kV — ISO 4406 purity grade — moisture content, ppm |
5 75 -/14/12 10 |
| 4 | Oil supply head, in (m) |
787.4 (20) |
| 5 | Max inlet pressure, psi (MPa) |
14.5 (0.1) |
| 6 | Max outlet pressure, psi (MPa) |
36.25 (0.25) |
| 7 | Oil heater power, kW |
20.4 |
| 8 | Nominal power, kW |
25 |
| 9 | Three-phase AC power:
— voltage, V — frequency, Hz |
400 50/60 |
| 10 | Max dimensions, in (mm)
— length — width — height |
59 (1,500) 39.4 (1,000) 61 (1,550) |
| 11 | Weight, lbs (kg), max |
1,433 (650) |
Note: * Initial oil parameters:
- Moisture below 0.005% (50 ppm)
- Oil heated to 140±41 °F (+60±5 °С) for 30 minutes
- Gas content below 10 %
Benefits
Major advantages of the DC-4.4D
- Compact: optimized footprint reduces installation space.
- Versatility: suitable for multiple applications, including, but not limited to oil heating, filtration, degassing, dehydration, and vacuum evacuation.
- No Adsorbents Required: transformer oil dehydration is achieved without any need for adsorbents.
- Environmentally Friendly: no air pollution, no waste streams to store or dispose of.
- Ease of Use: easy operation and low maintenance requirements.
- High Oil Quality: excellent oil purification results can be achieved even after a single processing cycle.
- Low Power Consumption: energy-efficient design with minimum power requirements.
- Noiseless Operation: low noise levels for improved operating conditions.
Details
1
Description
The DC-4.4D machine is designed for multiple applications, which involve insulating and cooling oils used in high-voltage electrical equipment, such as transformers, on-load tap changers (OLTC), transformer bushings, and high-voltage switches. The machine performs essential functions, including in particular:
- Heating, pumping, and purification of electrical insulating oils
This process removes solid particulates, dissolved gases, and moisture from the oil. - Evacuation of transformer tanks
The unit removes air and gases from transformer tanks during servicing or repair when gases may have entered the system.
Machine design
The DC-4.4D is built within a robust containerized enclosure, which houses all operational components, including:
- Vacuum processing chamber for lowering internal pressure to facilitate degassing.
- Vacuum generation components, including both booster and backing pumps.
- High-performance oil pumps.
- Integrated oil heating system.
- Dual-stage filtration system for removing coarse and fine particulate contaminants.
- Centralized control panel with indicators and operational controls.
Operating modes
The DC-4.4D offers several operating modes to meet different servicing needs:
- Oil Pumping Transfer mode
In this basic mode, the system functions as a transfer pump. Oil passes through the filtration system while being pumped from one vessel to another. - Heating and Filtration mode
In this mode, the oil is first pumped through the heater to raise its temperature. The heated oil is then directed through the filtration stages to remove particulate contaminants. The processed, clean, and heated oil exits the unit ready for use. - Degassing and Dehydration mode
For thorough processing, oil is first heated to 122–131°F (50–55°C) and filtered. The oil then enters the vacuum chamber wherein reduced pressure and elevated temperature work together to efficiently remove dissolved gases and moisture. The chamber contains specialized media intended to maximize the oil surface area, thereby enhancing the water and gas removal under vacuum. - Vacuum Evacuation mode
In this mode, the DC-4.4D is connected via hose to external equipment (such as transformers). The vacuum system then evacuates air from the connected equipment to achieve the required vacuum level.
2
Specification
| No. |
Parameter |
Value |
| 1 | Capacity, gpm (m3/h) |
4.4 (1) |
| 2 | Max oil outlet temperature in heating mode, °F (°С) |
140 (60) |
| 3* | Processed oil parameters (initial moisture less than 100 ppm):
— filtration, μm — minimum dielectric strength, kV — ISO 4406 purity grade — moisture content, ppm |
5 75 -/14/12 10 |
| 4 | Oil supply head, in (m) |
787.4 (20) |
| 5 | Max inlet pressure, psi (MPa) |
14.5 (0.1) |
| 6 | Max outlet pressure, psi (MPa) |
36.25 (0.25) |
| 7 | Oil heater power, kW |
20.4 |
| 8 | Nominal power, kW |
25 |
| 9 | Three-phase AC power:
— voltage, V — frequency, Hz |
400 50/60 |
| 10 | Max dimensions, in (mm)
— length — width — height |
59 (1,500) 39.4 (1,000) 61 (1,550) |
| 11 | Weight, lbs (kg), max |
1,433 (650) |
Note: * Initial oil parameters:
- Moisture below 0.005% (50 ppm)
- Oil heated to 140±41 °F (+60±5 °С) for 30 minutes
- Gas content below 10 %
3
Benefits
Major advantages of the DC-4.4D
- Compact: optimized footprint reduces installation space.
- Versatility: suitable for multiple applications, including, but not limited to oil heating, filtration, degassing, dehydration, and vacuum evacuation.
- No Adsorbents Required: transformer oil dehydration is achieved without any need for adsorbents.
- Environmentally Friendly: no air pollution, no waste streams to store or dispose of.
- Ease of Use: easy operation and low maintenance requirements.
- High Oil Quality: excellent oil purification results can be achieved even after a single processing cycle.
- Low Power Consumption: energy-efficient design with minimum power requirements.
- Noiseless Operation: low noise levels for improved operating conditions.