Transformer oil or insulating oil is usually a highly-refined mineral oil that is stable at high temperatures and has excellent electrical insulating properties. It is used in oil-filled transformers, some types of high voltage capacitors, fluorescent lamp ballasts, and some types of high voltage switches and circuit breakers. Its functions are to insulate, suppress corona and arcing, and to serve as a coolant.


The oil helps cool the transformer. Because it also provides part of the electrical insulation between internal live parts, transformer oil must remain stable at high temperatures for an extended period. To improve cooling of large power transformers, the oil-filled tank may have externalradiators through which the oil circulates by natural convection. Very large or high-power transformers (with capacities of thousands of KVA) may also have cooling fans, oil pumps, and even oil-to-water heat exchangers.

Large, high voltage transformers undergo prolonged drying processes, using electrical self-heating, the application of a vacuum, or both to ensure that the transformer is completely free of water vapor before the cooling oil is introduced. This helps prevent corona formation and subsequentelectrical breakdown under load.

Oil filled transformers with a conservator (an oil tank above the transformer) tend to be equipped with Buchholz relays. These are safety devices that detect the build up of gases (such as acetylene) inside the transformer (a side effect of corona or an electric arc in the windings) and switch off the transformer. Transformers without conservators are usually equipped with sudden pressure relays, which perform a similar function as the Buchholz relay.

The flash point (min) and pour point (max) are 140 °C and −6 °C respectively. The dielectric strength of new untreated oil is 12 MV/m (RMS) and after treatment it should be >24 MV/m (RMS).

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Vacuum transformer oil filter is mainly used for removing trace water, gas and impurities from insulating oil, improving the insulating oil performance index. It is mainly applied to purification of 110KV, 220KV, 500KV, 750KV, 1000KV power transmission equipment insulating oil, also applied to treat low viscosity oils, like insulating oil, turbine oil, and hydraulic oil in the transmission equipment which is lower than 110KV. Meanwhile, Series ZYD oil purifier can be used as independent vacuum source with functions of vacuum drying and vacuum oiling. Insulating oil performance mainly decided by oil’s water content, If the water is not saturation in the oil, it appears as the molecular states; If the water is saturation in the oil, it appears as the liquid states and stay at the bottom of container. Under the vacuum states, because the less gas content, the water and gas in the oil will be escaped from the oil and evacuated by the vacuum pump. The higher vacuum value (Close to 0 Pa), the higher speed of water molecular volatilization (The latest technology, the Vacuum oil purifier can reach to 1Pa Working vacuum value). The gas and water which dissolved in the oil will become gaseity and exhausted by vacuum pump. The oil temperature affect vacuum oil purifier working efficiency, the higher temperature, the water molecular get more kinetic energy, so it is higher diffused speed of water molecular. But, exorbitant temperature will cause fracture of carbon chain for oil molecular, if that will make oil bad. So we don’t suggest the oil temperature excess 80℃. Also the impurity will affect oil dielectric strength, so the vacuum oil purifier requires high filtration precision.

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Gone are those times when it was quite expensive to maintain lubricating or hydraulic oils. The only technique obtainable was to change for better the fluid on frequent intervals. The scenario has changed since then. Currently, stress is being offered on maintaining the oil clean whenever possible. The main reason of malfunction in moisturized and gas machines is the existence of pollutants in fluids.

The system breakdown may result in earnings loss, substantial servicing costs and worst being the buyer loosing assurance in the particular machine or manufacturer. To make certain steady operating of your models, it is significant to check and retain turbine oil.

Setting up a proper turbine oil purification method can only satisfy the requirements. There are many gas component companies coming up with total lubrication oil systems for gearboxes of wind turbines. These devices include filters, pumping systems, valves coolers, heaters and piping method for connecting these parts. The benefit of having such system is that the devices are examined thoroughly and offered with assurance of reliability from qualified vendors only. Another growing filtering technique is gaining interest these days. It is offered by including features and pieces in a manifold block instead of piping each and every part individually. The advantage of preserving such a method is to limit seepage possibility, lower assemblage time thus offering a far more stream-lined and lighter and reliable system.

The vacuum distillation process is considered highly effective with proven achievement rate. This procedure assists in cleansing the turbine oil by removing emulsified and dissolved water in addition to fine particulate and unwanted gas. The main benefit of setting up such a system is because they are all-in-one and skid mounted, may be handled instantly or with a control panel. Some of these products ensure processing of almost 100% of the reservoir capacity per hour. The usage of Coalescer / Separator and substantial quality filter systems might help clean the liquid of water and chemical contamination. This method makes certain very high quality of oil cleanness.

While installing the lubricating oil purifier, you should measure the active system and the degree of filtering required to preserve its performance. There isn’t any point deciding on high cost purification models in case your necessity is minimal. On the other hand, try not to bargain on high quality while buying the cleanser. You can pick a portable technique too, if the circumstance so demands..