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ELECTRICAL TRANSFORMER REPAIR

News, Useful

ELECTRICAL TRANSFORMER ELECTRICAL TRANSFORMER

THE GLOBECORE PROCESS
TO MAINTAIN ELECTRICAL TRANSFORMER OIL IN GOOD CONDITION

Nature of Problem: Transformer oil readily absorbs moisture from the air. This water decreases dielectric strength of the oil

GlobeCore Solution: CMM Oil Purification Plant is designed for thermo-vacuum drying, filtration and removal of solid impurities from dielectric insulating oils with a viscosity of no more than 70 cSt at 50°С.  The plant offers purification to class 9 from initial purity class 13 (contaminant content below 0.004%) in multiple passes of the product through the filter section. The Plant is available in different configurations and capacities.

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CMM 0.5

Processing rate 0.5 – m3/hour

CMM-2.2

Capacity 2.2  m3/hour

CMM-4.0

Capacity 4 m3/hour
  electricl transformer repair unit
Perfect solution for small electrical transformers
Conventional 220 electrical outlet power capability		 The unit is compact, protected with metal doors, can be trailer mounted for on  field use Perfectly fit for heating electrical transformer and other equipment that contains dielectric insulating oil with hot oil

Problem #2: Moisture in Solid Insulation

Nature of Problem: Insulating paper absorbs and retains moisture due to higher affinity of water to paper than to oil. Moisture in oil-paper insulation can cause electrical transformer failures because (1) it decreases dielectric strength, (2) it accelerates cellulose aging (depolymerization) and (3) it causes emission of gas bubbles at high temperatures.

GlobeCore Solution: Vacuum Cold Trap is connected to Electrical Transformer and vacuum pumps bring the pressure down to 26 Pa. Cooling of the evaporator in the low temperature trap to minus 70oC, causes pressure difference of water vapor above the surface of the solid insulation in the transformer tank and in the body of the cold trap. This difference is the driving force of water evacuation.

The unit is available in stock.

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Vacuum Cold Trap

Processing rate is 27×3=81  Pa, liters/second, min
The vacuum cold trap is designed for pulling vacuum and drying of solid insulation of power transformers with voltages 110-1150kV during installation, service and repair

Problem #3: Transformer Oil Oxidation

Nature of Problem: The reaction between unstable hydrocarbons in the oil, oxygen and other catalysts such as moisture, with additional factors such as heat, results in accumulation of decay products in the oil (oxidation by-products). Once oil oxidation starts, the oxidation products themselves act as catalysts to accelerate the oxidation reaction.

GlobeCore Solution: CMM-R and UVR units are designed for Complete Oil Restoration (of dielectric strength and chemical composition). The main operating principle of those units is percolation of oil through a stable sorbent layer. The CMM-R plant operates with Fuller’s earth and the UVR unit uses a special GlobeCore sorbent. All together, the systems remove acids, water and contaminants from insulating oil and insulating paper/windings of an electrical transformer. Those units are very Environmentally Friendly, as exhausted sorbent can be reactivated and used again in up to 300 cycles.

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CMM-R2

Processing rate 100 – l/hour

CMM-R24

Capacity 6000  l/hour

UVR 450/16

Capacity 100-1000 l/hour
The unique feature of the CMM-R unit is the capability to regenerate insulation oil directly in an electrical transformer ·                Energized transformer oil processing; and

·                Automatic Sorbent Reactivation

·                Trailer mounted

 The unit successfully processes dielectric transformer oil, turbine oil, industrial oil, heavy fuel oil, and Diesel fuel

 

Problem #4: Dissolved gas and/or decay products

Nature of Problem: During its lifetime, the transformer generates decomposition gases, essentially from the organic insulation, under the influence of various stresses, both normal and abnormal, which could lead to failure if ignored.

GlobeCore Solution: The UVM unit is designed for degassing, drying, removal of solid particles and heating of transformer oil used in power transformers up to 1150V.
The unit can process mineral oils with the following properties:

Dynamic viscosity, mm2/sec, at 50 °С                    2…12;

Density at 20°С, kg/m3                                           800…950;

Moisture content, ppm, max                                    100;

Purity class ISO 4406, at least                                -/19/16

The UVM unit is available in different design configurations, Zeolite Filtration Section CP-260 is available as an option.

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CMM-UVM 4/7

Processing rate 4 – m3/hour

CMM-UVM 10/15

Capacity 8 m3/hour

MCU ZEOLITE OIL DRYING UNIT

Capacity from 1.5 to 4.0 m3/hour
Zeolite drying system
The UVM unit is designed for:

·         Vacuumizing transformers;

·         Removal of solid particulate matter;

·         Removal of water;

·         Removal of gases

 The unit is placed on a tandem axle trailer that is street legal and ready to be towed to any remote  location  This unit is designed to significantly reduce acid levels in used insulating oil

GlobeCore presented a seminar In Quito

News

During 2 days, May 3-4 in Quito (Ecuador), GlobeCore held a seminar presenting its equipment

The event was attended by representatives of the electricity industry from many countries, including Peru, Bolivia, Argentina, Colombia, Costa Rica and El Salvador.

The seminar covered the following questions:

  • General information about GlobeCore;
  • Modern technologies in cleaning and regeneration of mineral oils;
  • GlobeCore; equipment for regeneration of insulating oils and servicing power transformers;
  • Practical demonstration of the СММ-12Р unit – regenerating oil on an energized transformer.

The first day ended with a discussion of questions and answers about the  СММ-12Р operation.

On May 4, the issues of possible technical and commercial cooperation on an individual basis were a positive conclusion.

GlobeCore;would like to thank all the guests for their interest and active participation in the seminar, and Tcontrol S.A. – for their help in organizing and conducting the event.

GC equipment put into operation in Saudi Arabia

News

April 23 – 27, 2017 in Jeddah (Saudi Arabia), GlobeCore engineers carried out an effective  commissioning of  the CMM-0,6 unit.

This equipment is ideal for organizations that has oil-filled equipment and require their insulating oil cleaned from mechanical impurities, water and gases with processing rate 158 gal / h. The CMM-0,6 unit circulates the oil through the filter unit cleaning it with every passage.

The unit that was put into operation in Jeddah has additional features that were requested by the customer, such as:

  • assembled in a container on a single-axle trailer;
  • a compartment for tool-box at the front of the container;

• TSS system for safe connection of mobile oil cleaning unit to an on-line transformer.

Putting equipment into operation in Estonia

News

April 10, 2017 GlobeCore engineers visited Tallinn (Estonia), where they prepared to start CMM-4/7 unit on the trailer.

CMM-4/7 units are in demand at enterprises engaged in installation, repair and operation of power transformers, as well as other oil-filled equipment. This unit solves several tasks at once: it heats and vacuum treats a transformer, it also filtrates and degases insulating oil.

The processing rate of the equipment vary in different operating modes: it is 7 m3 / h in heating and filtration mode, and – 4 m3 / h in degassing mode

CMM-4/7 units of GlobeCore provide:

  • volumetric gas content below 0.1%;
  • moisture content by weight below 5 g / t;
  • ISO 4406 industrial purity class – / 14/12.

To select and purchase this degassing unit, please contact our managers at the contacts section of our site.

Purification, clarification and regeneration of mineral oils and diesel fuel by the UVR-450/16 unit

Articles

Mineral oils. Industrial oil, turbine oil, transformer oil and compressor oils are used in difficult conditions of high temperatures, exposure to air, mechanical contamination, contamination with water etc. Over time, these oils lose their performance properties and need to be replaced or regenerated.

As for other petroleum products, for example, diesel fuel may lose its properties in long storage storage under exposure to sunlight, moisture, air and dust. All mineral oils change their color with time.

Based on the current market demand for oil restoration equipment, GlobeCore developed a universal UVR-450/16 unit  for purification, clarification and regeneration of mineral oils and diesel fuels. This equipment fully restores the properties of petroleum products. The recovered oils will not darken and may be used for its purpose, saving money.

The UVR-450/16 unit has the following advantages:

  • Manufactured in three versions: general purpose industrial frame, general purpose industrial container, fire and explosion proof;
  • Easy switching from one oil to another without structural reconfiguration;
  • Compact size;
  • Manual or automatic modes;
  • Does not require special placement.

The processing rate of UVR-450/16 in regeneration mode varies depending on the type of processed oil. For example, the processing rate of transformer oil is 0.3 m3/h, that of diesel fuel is 0.8 m3/h. Oil loss does not exceed 1.6% of the initial volume.

Desulfurization of diesel fuel

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Desulfurization of diesel fuel. Thus, the consumer receives fuel with strictly limited sulfur content. Obviously, the less sulfur, the more expensive the product. A way to save on the fuel bill is to take lower grade diesel fuel and process it to satisfy the requirements of the vehicle fleet.

GlobeCore offers the desulfurization process based on the AVS-150 magnetic nano-mill and the UVR unit.

The process equipment for continuous desulfurization is a 1 cubic meter tank, a pump to supply the fuel to the AVS-150, a vessel with a dosage pump to supply reagent, a portioning device to supply ferromagnetic particles into the chamber of the AVS-150 and a UVR vacuum fuel regeneration unit.

The 1 cubic meter tank is filled with the fuel to process. The pump supplies it to the chamber of the AVS-150 along with the reagent from the 30 liter tank. After treatment in the unit, which only takes a fraction of a second, the fuel flows to the UVR unit, where is passes through a layer of adsorbent to remove the products of the reaction between the reagent and sulfur. The treatment and mixing of the reagent with the diesel fuel is performed by steel ferromagnetic particles. Particle wear is 5 grams per 1 hour of operation, that is, 0.01 gram per 1 liter of processed fuel. Particles are loaded automatically by a portioning device. The rate of processing is 0.5 m3/hour.

The efficiency of chemical processing depends on the intensity of mixing and completeness of reaction product removal. Intensive mixing of reagents, even at high temperature and low concentration of of solution, forms emulsions which require more time to separate. To intensify this process, the AVS is used to facilitate intensive mixing of the fuel with the reagent.

As a result of our tests, we reduced the amount of sulfur in diesel fuel from 337 to 8 mg/kg, while retaining other important quality parameters, such as flashpoint, fraction content etc.

GlobeCore Diesel Fuel Desulfurization Unit

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Diesel Fuel Desulfurization. Sulfur is a common component in crude oil, where it can be present both in elementary form and in the form hydrogen sulfide and organic substances, such as disulfides, mercaptan etc. Generally, the influence of sulfur and its compounds on oil products is negative, due to its corrosive properties. That is why it is recommended to eliminate sulfur and hydrogen sulfide and limit the content of mercaptan. The content of other sulfur compounds is regulated by such parameter as “sulfur content by weight”.

The strict the requirements on sulfur content in fuel, the deeper the purification and the cost of the process. This is the reason that this chemical element is present in practically all fuels in the market.

Nevertheless, the weight part of sulfur in oil products is limited by regulations for environmental reasons. Sulfur compounds increase toxicity of exhaust gases and are under close scrutiny of environmental protection agencies.

Desulfurization begins at the stage of crude oil refining. This is achieved in the processes of catalytic hydrotreatment, biodesulfurization, oxidation of sulfur compounds by hydroperoxides etc. The content of sulfur in finished product is also one of the criteria of grading it. Euro-2 diesel fuel contains no more than 500 mg/kg of sulfur compounds, Euro-3 – 350 mg/kg, Euro-4 – 50 mg/kg and Euro-5 -10 mg/kg.

Heavy Fuel Oil: Considerations on Use

Articles
Heavy Fuel Oil

Winter brings the need to heat buildings. Natural gas and diesel fuel are relatively expensive to use as heat sources, so people more and more look at alternatives. This is a good time to discuss heavy fuel oil. The main advantage of this product is ease of storage and transportation.

Heavy fuel oil is made from straight run diesel and secondary distillation fractions (distillates of catalytic and thermal cracking and coking). Fuel oil is somewhat heavier than diesel. Regulations such as iodine and cetane number, as well as cloud point are not mandatory for heavy fuel oil. If the product is made from sour crude, sulfur content may reach 1.1%.

Here are the main operational properties of heavy fuel oil:

  • ash – below 0.02%;
  • settling point below -5ºС;
  • flashpoint 45ºС;
  • color – colorless, black;
  • density– not regulated. This does not have to be measured.

So as to improve the low temperature properties of the product, special additives are used, which are synthesized from ethylene and vinyl acetate copolymers.

Heavy fuel oil is mostly sold for household heating.

The advantages of heavy fuel oil are:

  • high calorific value with low consumption rate;
  • price lower than traditional energy sources;
  • low settling point and low viscosity.

How many cubic meters of oil can be regenerated with one load of sorbent in the UVR-0.1?

Articles
sorbent

When using the UVR-0.1 oil cleaning and regeneration unit, the most frequent questions are the average amount of sorbent used and the amount of oil processed by this sorbent.

The UVR units for cleaning and regeneration of oil use a combination of thermal vacuum filtration with a special sorbent

The main feature of this equipment is the ability to work with various types of oil: transformer, turbine and industrial oils, diesel and heating oil, gas condensate, kerosene, etc.

It is important to understand that each of these oil products has different physical and chemical properties, and the amount of absorber used for regeneration may be different in each case. In general, the sorbent consumption is 3-17% of oil weight and 1-7% of fuel weight.

The UVR-120 unit is loaded with 120 kg of sorbent and it is possible to calculate the amount of oil cleaned with one load. With 120 kg it is possible to clean 700-4000 liters, which corresponds to 0.7 – 4 m3.

The consumption of absorber also depends on the degree of oil pollution and its acidity. The dirtier the oil and the more is its acid number, the greater amount of absorber is required to achieve the desired result.

UVR: the best solution to the problem of fuel and oil regeneration

Articles

The question of oil regeneration generally arises after the oil has been severely polluted and changed its chemical composition as a result of long-term operation or storage.

Even ordinary dust or micro organisms can significantly reduce the quality of diesel fuel; and metal shavings in industrial oil can cause failure of expensive equipment.

What should also be said about transformer oil?  It serves as insulation and heat removal medium from the hot parts of a transformer. Oil contaminated with water may cause losses measured in hundreds of thousands and even millions of dollars. Therefore it is always necessary to use only pure oil, and also to monitor its condition during the entire period of operation. Critical deviations from the norm demand the oil to be drained and replaced with new, or the dirty oil to be regenerated and reused.

In the former case the old oil needs to be recycled, as it is against the law to dump it into soil or water, and it is heavily fined by the authorities. Also it is becoming more and more difficult to solve the global environmental problems. Another expense is the purchase of new oil. In the latter case, it is not necessary to purchase fresh oil. Regeneration equipment prolongs the service life of waste oil or dirty fuel after appropriate treatment.

Now there is a lot of oil cleaning equipment available on the market, but not all of it is capable of restoring the oil to its original state, or close to it. For example, the classic sedimentation, centrifugation or filtration techniques  remove mechanical impurities and water only, at best.

Practical experience shows that the best results of purification and regeneration of petroleum products are achieved with the combination of various methods. Based on this experience GlobeCore developed the UVR unit for oil recovery on the basis of thermal vacuum filtration with adsorbent

The UVR unit can clean transformer oil, industrial oil, transmission oil and other types of mineral oils, as well as diesel fuel and heating oil, gas condensate, kerosene, etc. After processing, the oil completely restores its performance properties and color.

The transition from one type of oil to another does not require any complicated manipulations. Consumption of absorbent is the only difference.

The UVR unit is easy to transport, and it can be used to provide mobile services for cleaning of fuel and oil.