Solution to Remove Exceeding Hydrogen and Acetylene In Transformer Oil

What Issues Can a Transformer Vaccum System Fit In?

During a normal operation, there are many issues can a transformer vacuum system fit in, transformer oil and solid organic insulating materials decompose a small amount of hydrogen, low-molecular hydrocarbons (hydrocarbons), carbon monoxide, and carbon dioxide under the action of heat, and most of these gases dissolve in the oil.

When the transformer is defective or malfunctions, the type and quantity of gas in the oil will change. When part overheating occurs, the various components of hydrocarbons increase significantly. If the solid insulation is damaged, carbon monoxide and carbon dioxide will increase. When the high-energy discharge of insulation breakdown occurs, the nearby oil is almost completely thermally decomposed, and the gas production increases sharply. In addition to carbon particles evenly dispersed in the oil, the important gases are hydrogen (H2) and acetylene (C2H2). When the low-energy discharge of spark discharge occurs, the important gases are still H2 and C2H2, but the quantity is much smaller than that of high-energy discharge. When a partial discharge occurs, the free molecules of the oil will be freed, and the important gas produced is H2, and there is also a small amount of C2H2 and CH4 (methane).

No matter what kind of discharge, as long as solid insulation is involved, CO and CO2 will always be brought out.

a comparison with good and bad transformer oil

Carbon Black Particles In Transformer Oil

Oil carbon black is produced when insulating oil burns under the action of an electric arc (in operation). Carbon black is usually colloidal and uniformly dispersed in oil, but when there are more carbon blacks, it becomes a unit form from the oil. Colloidal carbon black is mostly found in switch oils and is evenly distributed in group oils. In all cases, the insulating oil has a shiny blue to purple appearance. Carbon black can be removed through ultra-high pressure oil treatment equipment.

Hydrogen and Acetylene In Insulating Oil

For the operation of insulating oil, the oil will occasionally emit different smells, and these smells may also be precursors to accidents.

(1) Acetylene: partial discharge, local overheating, local friction, fluid friction.

(2) Burnt Gas: thermal decomposition of fiber

(3) Fishy Gas: decomposition of shellac

(4) Musty: aging

(5) Pungent sour: aging

The Best Way to Remove Acetylene and Hydrogen In The Oil — Vacuum Oil Purifier 

Analysis of the reasons for the generation of acetylene in the oil: First, the acetylene contained in the transformer oil itself; when the vacuum oil purifier processes the insulating oil, the oil generates too high temperature in a local area, and the fluid friction generates acetylene when the oil purifier is working. Oil decomposition-from high molecular weight to low molecular weight, thereby producing hydrogen, acetylene and CH4 (methane) gas. Most vacuum oil purifiers usually produce acetylene and other gases in the process of oil processing. If the oil has not been removed at the end of the oil processing, there will always be a small amount of hydrogen and acetylene gas in the processed oil.

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The working principle of the vacuum oil purification machine should be to evaporate the water, hydrogen, methane, ethane, ethylene, acetylene, total hydrocarbon, carbon monoxide, carbon dioxide and other gases in the oil from the oil. However, due to the very strong binding force between trace amounts of water, gas, and oil molecules, conventional vacuum oil purifier machines have limited oil-gas-water separation capabilities, which cannot guarantee that the water and gas in the oil reach a very low level, and cannot guarantee the acetylene and hydrogen in the oil. Is zero. Therefore, there is a common cause of acetylene in vacuum oil purifiers that are currently used in large quantities.

Advantages of Oil Vacuum Pumping System

The transformer vacuum pump system is widely used in the installation and maintenance of various types of large transformers to achieve efficient vacuum drying and vacuum pumping. YUNENG’s oil purifier has the characteristics of fast air extraction, it is widely used in oil purification treatment and vacuum hot oil circulation drying in the installation and maintenance of various large transformer equipment, and the purification treatment of high-voltage and ultra-high voltage transformer insulating oil above 500KV-1000KV. It is also suitable for high-grade new oil and deep imported oil. Treatment, its dehydration, degassing, removing acid value, removing free carbon and impurities, etc. After treatment, the ultimate voltage resistance of transformer oil is higher. It can be used for oil filtering or as a self-powered vacuum source for vacuum drying and oil filling of transformer equipment.

Working principle of two-stage vacuum oil purifier

  • The spiral spray atomization oil film flash evaporation technology can remove moisture, impurities, colloids, etc. in the oil, and the transformer insulating oil after treatment can be higher than the new oil standard.
  • Infrared progressive scanning defoaming automatic control system, flash rapid evaporation system, its dehydration, degassing, impurity removal, the result is faster, more thorough, and higher pressure resistance.
  • The oil delivery system of the two-stage vacuum oil purifier; adopts the three-screw pump to run smoothly, and the heating adopts indirect heating; to avoid local overheating of the oil. The special material and unique performance curve ensure that the oil flow will never cause the problem of acetylene generated by the gap discharge, and the performance of the oil treatment process and equipment is higher than the international standard.

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