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Time：2025-08-29 11:49:47 Reading volume：
The following is a professional guide on how to choose a small transformer oil filtration system. The key lies in understanding the unique requirements of transformer oil treatment.
For transformer oil, a small vacuum oil purifier is the absolute first choice and standard. It integrates three functions: dehydration, degassing, and impurity filtration.
Working Principle:
After the oil is heated, it passes through a specialized degassing tank or thin-film evaporator, creating a large surface area (atomization or film formation) under a high vacuum environment.
The dissolved water and dissolved gases in the oil rapidly precipitate at their low boiling point and are extracted by a vacuum pump.
The dehydrated and degassed oil then passes through a precision filter element to remove solid particulate impurities, resulting in purified oil.
Ordinary pressure oil purifiers (relying solely on filter elements) can only remove free water and solid particles and are virtually incapable of removing the most harmful dissolved water and dissolved gases. Centrifugal oil filters can only separate free water and larger particles of varying densities and are unable to process dissolved water.
When selecting equipment, be sure to carefully check the following technical parameters:
The higher the vacuum, the greater the dehydration and degassing capabilities. An excellent small transformer oil filter should have an ultimate vacuum of ≤5 Pa or even higher. This parameter directly determines whether it can deeply remove dissolved water.
The heater should maintain the oil temperature between 50-65°C. High temperatures accelerate oil oxidation, while low temperatures result in poor dehydration. The equipment should have a constant temperature control system.
The filter element should have a minimum fineness of ≤5μm, with a precision of 1-3μm being optimal. This ensures effective removal of fine particles and increases the oil's breakdown voltage.
Inquire about the filter element's β value (filtration ratio). A higher β value indicates higher filtration efficiency. For example, a β₅ value of 200 or higher indicates a 99.5% removal efficiency for particles larger than 5μm.
The breakdown voltage (dielectric strength) of the treated oil should easily reach 70kV or higher, and be comparable to higher standards (such as new oil standards). This is the ultimate indicator of the equipment's oil purification effectiveness.
ｓｅｌｅｃｔ based on the size of your transformer and maintenance schedule. For small units, the flow rate is generally around 20-50 L/min. A higher flow rate is not necessarily better; it must match the equipment's dehydration and filtration capabilities.
Oil Pump: Choose an internal gear pump or screw pump that operates smoothly, is quiet, and offers low shear forces to avoid the generation of gases like acetylene.
Vacuum Pump: Rotary vane vacuum pumps are recommended for their stable performance and ability to easily achieve high vacuum requirements.
Interlocking Protection: The equipment should be equipped with safety devices such as a liquid level controller (to prevent oil leakage), overload protection, and overtemperature protection.
Online Monitoring: High-end models are equipped with online moisture detectors and particle size detectors, providing real-time information on the quality of the purified oil.
Mobility: Small units are typically designed to be mobile, with wheels and a tow bar for easy movement within the substation.
Material: Major flow-through components should be made of stainless steel to prevent rust and secondary oil contamination.
1. Clarify Requirements:
Determine the volume of transformer oil you will be processing (weight per transformer), the current oil quality (especially water content and breakdown voltage), and the target purification standard.
2. ｓｅｌｅｃｔ Type:
Without hesitation, choose a small high-vacuum oil purifier.
3. Compare Parameters:
Primarily consider: vacuum level (≤5 Pa) and breakdown voltage (≥70 kV).
4. Secondary considerations:
filtration fineness (1-3 μm), flow rate (to match the requirements), and heating temperature control (adjustable from 50-65°C). 4. Examine the configuration: Inquire about the brand and type of the oil pump and vacuum pump, the filter element standard and brand, and the main body material.
5. Verify Safety and Intelligent Features:
Check for necessary safety features and whether online monitoring is required.
6. ｓｅｌｅｃｔ a Reliable Supplier:
Choose a manufacturer specializing in insulating oil treatment equipment; they are more likely to provide technical and after-sales service that meets power industry standards.
Finally, a reminder: For ultra-high voltage transformers or occasions with extremely stringent requirements on oil quality, further deep purification measures such as molecular adsorption (such as silica gel, alumina balls) may be required after vacuum oil filtration, but the small vacuum oil filter is the most core and basic equipment.
