HV side, LV side and Neutral. As the Nitrogen in the conservator air space moves between the bellow and conservator, it gets dried by the silica gel and moisture migration from Paper to oil, oil to Nitrogen and from Nitrogen to silica gel would be a continuous process. They're basically designed to modify any alternating current voltage via electromagnetic induction. Silica gel does indeed have a higher adsorption % by weight, but it only provides relatively "dry" air, 10Cdp (12,317 ppm). Change of color and the related Indicating Production or Trading of Good or Services for Sale Cost of supplies and equipment Change in the volume of expected sales reactivation and replacement . rubber bag/membrane - Maintenance history . The silica gel plays a critical role in the performance of electrical transformers. Silica gel (silicon dioxide) is a colorless , granular, porous material with desiccating properties, made out of sodium silicate. It consists of a float arm inside the tank, an indicator pointer and magnetic coupling between the two via a tight liquid separator. Attention is also paid to silica gel in the air dryer. Transformer oil filling has a few distinctions when performed in the course of transformer operation. Silicagel may be reactivated by heating in a thin pan at a temperature of 1500C to 2000C for two to three hours when the crystals should have regained their original blue tint. It can absorb 15-40% by weight of moisture depending on the relative humidity of the exposed atmosphere. When free from moisture the crystals of silica gel are blue. Size R2 transformer breather filled with indicating silica gel. check the oil level in oil cap under silica gel breather: 4: 2: 2: PC12. Transformer Condition Assessment T048 Tully Substation 8 2.2.4 Silica Gel Breather: As with many transformers inspected in the field, it is impossible to visually inspect the condition of the oil bath on the bottom of the main conservator desiccant breather due to the design of the breather. A silica gel providing dry air at -40Cdp (188 ppm) at 10C will adsorb 3% by weight, and a . 25KG. 5.For large transformers, it is recommended that the oil be kept under observation for acidity. replacement costs of a transformer and also any other . In case of unsatisfactory oil level in the MOG, oil to be filled in transformer and also the transformer tank to be checked for oil leakage. Protective housings Optional protective stainless steel and expanded metal housings are available for additional protection. . AIR TIGHT PACKING. Annually Features. Transformer is issued as per the load given in the requisition. (if oil can get out, water can get in). Silica gel breathers are fitted to oil filled transformers. Transformer & its accessories shall be carefully handled so as not to damage external parts or inside assembly as this can lead to bodily damage and/or electrical failure. SKU: TBR2-R. Some of the common failures/ defects occurred in transformer are as under: 1. The silica gel is a very good absorber of moisture. Evacuation is required with voltages above 110 kV. For plug-in mercury thermometers, they are often installed on the low pressure side of the top cover of the fuel tank. Always make sure the breathing holes are clean to allow for proper breathing action at all times. The breathing holes and oil level in the oil cap of the silica gel breather must be checked on monthly basis and if the oil level is below the specified level then oil is to be top up as per specified level. Above Photo added 5 June 2021. If the acidity is increasing rapidly, transformer cover should be removed for checking purpose of the interior of the tank and of the core and winding's. Oil should be treated or discarded, if the sludge or corrosion is there. Silica Gel Breather VARIOUS PARTS OF POWER TRANSFORMER WINDING AND CORE OF TRANSFORMER . Low break down voltage (BDV) 3. 3. It is basically used in the breathing process of Transformer. Size 'V, W & X' Transformer Breather has a 3/4" Female Pipe Thread. These instructions should be read in conjunction with any local safety regulations and work procedures. The silica gel can be regenerated or discarded once the color changes. When saturated with moisture, the silica gel contained should be replaced. Liquid level gauge, accessory in liquid transformer. The blue silica gel is replaced by orange silica gel which in turn contains silicon dioxide and is in beaded form. Humming sound Go back to contents Investigation into causes of failures of transformer Silica gel is available in two primary types indicating and non-indicating. demonstrate repair and maintenance compliance stated in the standard procedure manual: 100: 3: 1: 2: . Check oil level from glass. There are generally two types of breathers used on a transformer: Plain breather; Silica gel breather; Freshly regenerated gel is very efficient, it may dry down air to a dew point of below -40 o C. Put the dry adsorbent into the moisture absorber. Always maintain to keep oil filled up to the desired level in MOG. Silica Gel provides a low cost insurance. 4. modern plants to a 6.6 kV busbar at Water Intake. u2002Sudden pressure relays are a specialized protection device to detect transformer or reactor problems. Non-woven cloth packet material with back seal and inspection window. Download. power transformers have been of great interest for the researchers [14-19]. A liquid level indicator is provided to assist with the transformer 's systematic testing under load. To replace, simply empty the spent breather contents and refill with new desiccant. Power Transformer Testing Procedure. 105554. Main Tank Body Neutral Tertiary Winding Terminal o Color of Silica Gel Breather of Transformer If Color of Silica Gel becomes Pinkish, . 40 % absorption at 100 % humidity. Dielectric strength test (BDV) and moisture content (PPM). 2. Check resistance and IR value of NGR, if provided 12. Take the necessary steps to prevent that water condensation is formed in the accessories and parts that are delivered separately. Internal Sources Paper degradation produces water. Reclamation of oil with a high acid content consists of fuller's earth treatment, silica gel treatment, filtering treatment and degasification. Clear polycarbonate body allows easy monitoring of the desiccant for replacement purposes. 1. Check that colour of silica gel in breathers of main conservator and OLTC conservator is blue. The structure of the transformer thermometer is shown in the figure. DISTRIBUTION TRANSFORMERS CONTENTS 1.0 General 2.0 Conditions of Guarantee 3.0 Transportation . Packaging Type. When the silica gel is fully saturated, it will no longer absorb atmospheric moisture as it enters the transformer therefore the silica gel must be . 6. Inert, non-toxic and non-corrosive. Conservator up to 4750L oil capacity. If silica gel becomes pinkish, it should be replaced. Application flexibility 3. . R, R1, R2 Transformer Breather 1. On average, EDP Distribuio has to replace the silica gel in each transformer every three months. Check color of the silica gel, check that air passages are free, check the oil level in the oil cup. It is generally advised to keep a 5-10 cm ( 2-4 inches) 'buffer' of dry silica gel at all times, but regenerating or replacing the silica gel when it is 1/3 is saturated is best practice. Once the silica gel is saturated, it is replaced and properly managed as industrial waste. These reservoirs and cans can be carefully removed by unscrewing the devices from the pipe while the TX is in service. In practical operation, different types of transformer oil and insulation oil are treated by different types of Transformer Oil Purification Plant, and the effect is better. replacement of silica gel in adsorption filters; . When more than 1/3 of the silica-gel filling has changed color, the filling shall be replaced or reactivated by heating at 120 C (24 hrs.). CIGR-229 2013 CIGR Canada Conference 21, rue d'Artois, F-75008 PARIS The Westin Calgary http : //www.cigre.org Calgary, Alberta, September 9 - 11, 2013 The Service Reliability of Aging Power Transformers I. Fofana1* and J. Sabau2 1 Canada Research Chair on Insulating Liquids and Mixed Dielectrics for Electrotechnology (ISOLIME . If you have a building, or perhaps a facility that deals with manufacturing, then there's no doubt you have a demand . As they are put to use, the crystals can take up moisture, it gradually turns pink and gives a ready indication that done its work and need replacement or regeneration. This change in color of silica gel blue indicates and alerts the user that it needs to be replaced or regenerated. If the values are found to be irregular, then the oil has to be replaced. Critical loads go to the top! Here are 3 maintenance tests you should run on your transformer on a daily basis: Oil levels of MOG ( Magnetic Oil Gauge) of the main tank and conservator tank. Health index-based power transformer asset management was introduced in [14]. Standards call for 27 % moisture absoption capacity at standard atmosphere. Fuller's earth treatment an silica gel treatment will remove both acid in the oil. bad gasketing, cracked insulation, a loose manhole cover, a ruptured explosion diaphragm etc. Measures 362mm H x 108mm D. From $300.00 See Options R Series - Blue Silica Gel Refill 3-5mm beaded blue indicating silica gel for Brownell's R series transformer breathers. Size R2 transformer breather filled with orange to green indicating silica gel. Bushing failure 4. The first step of oil filtration is to raise the temperature of the oil to up to 65 degree Celsius. 11. Silica gel is usually fitted in a glass or PVC round canister or canisters on an outside breather pipe of a power transformer. Transformer Breathers exceed the ASTM D- 1533 testing specifications and outperform silica gel breathers by over 75% at average operating temperatures 77 F. The thermometer seat on the top of the box should be cleaned first, and transformer oil should be injected, and then the thermometer should be inserted and . This is a general procedure for calculation that can be . Clear polycarbonate body allows easy monitoring of the desiccant for replacement purposes. Excessive overheating of oil 6. Troubleshooting Procedure for Vacuum Circuit Breaker. Keep an eye on the silica gel. Color of silica gel in breather. Color change is you main indicator. Transformer maintenance procedure and solution methodology were presented in the context of mid-term and short-term transmission asset maintenance scheduling in [15, 16]. For general transformer oil polluted by water and dust and other impurities, plate and frame pressure type Transformer Oil Filter Machine can be used. 27. 1)Silica Gel. Repair or replacement are made to ensure that . The silica gel should be replaced soon after it color changes from blue to pink. additional support for the Transformer Breather. If oil leakage is found take required action to plug the leakage. Before filling the container with silica gel, clean and dry all parts of the breather. PC12. The silica gel TLC plates come in a quantity of 25 size 20x20 cm for thin layer chromatography applications. This article suggests a number of simple improvements to improve the practice and procedures for reactivation of silica gel. PC11. The purpose of these silica gel breathers is to absorb the moisture in the air sucked in by the transformer during the breathing process. Sometimes there is a small oil bath reservoir underneath. . Traditional breathers require continual maintenance taking note of gel color changes indicating the need for replacement. Read Paper. silica - gel and/or of the nitrogen pipes should be performed when the tank is partially filled with oil. Silica gel can be periodically dried and the natural drying process of the Transformer can be ensured. From installation, maintenance, commissioning to winding, our professional and . Transformers are electrical machines which play a very important role in a building's power system. Packet measures 145 x 225mm. Reactive/replace with a new charge, if it is pink, makeup oil in oil cup. 3. This work environment is hazardous and correct safety procedures should be in place and adhered to before attempting to install or remove these breathers. Transformer Silica Gel Replacement Procedure and How to Reuse Silica Gel 1,360 views Mar 21, 2021 25 Dislike Share Electrician Adda 8.7K subscribers In this video, you will learn about the. Let's look at a scenario where we would exceed the ANSI 6006-A03 F.5.3.3.2 standard of less than 500 ppm moisture. At the same time look for any oil traces on the tank. 3. With more than 20 years in Singapore's electrical and mechanical engineering industries, Maintech Engineering & Supplies is perfectly positioned to provide some of the best electric transformer overhaul and repair services, for power or distribution transformers. $300.00. silica gel replacement work electrical transformers - Silica Gel Breather of Transformer.When should I replace silica gel in transformer?The color of the sil. Silica gel is a popular desiccant choice in the food and drug (pharmaceutical and nutraceutical) industry due to its inert, non-toxic, and highly stable properties. As the transformer breathes, the silica gel serves to remove moisture from the air, thus delivering dry air to the transformer. Filtering system will remove the particulates completely. . Use the adequate protection against the weather elements. It is nothing but a pot of silica gel through which, air passes during breathing of transformer. When refilling, it is important to keep new oil temperature close to the oil in transformer, within 5 C. Leakage of oil from any point of a transformer. 2. A redund ant . Silica gel, or gel packets, are used throughout industry to adsorb moisture and maintain low relative humidity thereby preventing product contamination and degradation. Silica gel desiccant reactivation is a common operating procedure regularly used and performed to remove moisture from saturated material. The Silica Gel Breather should be connected to the flange Dehydrating Breather. action is to be taken to stop the leakage of oil. The oil must be cooler than transformer core, but hotter than 10 . Blue Silica Gel is also known as Self Indicating Silica Gel as it is prepared by impregnating White Silica gel with Cobalt Chloride present in a concentration of 0.5 to 1% weight for weight, an indicator, which provides the Blue color appearance. Step Two: Rank the transformers in your current fleet to plan and budget for moisture reduction and management for existing assets based on priority and need. 1. 14. Design and Construction of condenser bushing :-The general constructional details , are shown in Fig. check Bushing collar, gaskets and gaskits joints for any leakage of oil. If oil leakage is found take required action to plug the leakage. Via leaks into the power equipment, i.e. (2) The moisture absorber replaces the silica gel. v) A tool box talk to he held before commencement of every shift to highlight on the new . Step One: Revise your power transformer specifications so that a proactive moisture management system is included with your transformer from the factory. TLC Silica gel 60 F. Color of silica gel is checked and if it becomes pinkish, it needs to be replaced. During warranty period, transformer or a part of transformer shall not be opened for repair or internally inspected by third party in absence of SE-TBI Engineer. Winding failures 5. is to elaborate on the dynamics of rerouting the power supply from the old plant to the supply of the. Transformer 3D Design. Condenser bushing :-Fig-1. Verify that the oil level in the oil cup is correct or not -correct. Low IR value 7. identify nature of fault and carry out repair and replacement: 3: . When the conditions are fulfilled the procedure for parallel operation is as follows: a) Connect the corresponding high voltage terminals . Calculate the volume or area of the container. Figure 9-2-8.2 Technical transfer of patrol procedures (2) Suggestions for substation equipment maintenance Tackle PPUC has not replaced the silica gel in their transformers since they were installed. transformer, this relay is actuated. The temperature increases to more than 65 degrees celsius, whose latent heat separates moisture and gasses. This gas is collected in the relay to actuate the alarm and trip contacts. Silica gel is capable of adsorbing up . When the silica gel is fully active, the blue crystals will have a deep blue color and change to pink as it absorbs moisture. This relay operates on the well-known fact that every type of electric fault in an oil-filled transformer gives rise to gas. The sudden pressure relay detects sudden changes in transformer oil or gas pressure due to internal faults. Silica gel remains dry when saturated with moisture. Transformer Oil . Aluminum TLC plate, silica gel coated with flourescent indicator F254. This process corrects the acid number as well as the colour. Ensure your maintenance crew pays close attention to the . Oil in breather cups to be filled up to level indicated Commissioning Procedure for a Transformer . This video shows how to refill silica gel in breather of power transformers. Check that oil is filled in OTI and WTI pockets. Top up, if found low. Breathers are installed on electrical transformers (conservator type) and are de. Silica gel is a partially dehydrated form of polymeric colloidal silicic acid. In case of unsatisfactory oil level in the MOG, oil to be filled in transformer and also the transformer tank to be checked for oil leakage. The purpose of this document. Burnt Out Replacement. Identify the type of container or bag the product is packaged in. If the replacement bushing has a socket at the bottom end, the old bushing should be unclamped and withdrawn from the tank. dokumen.tips . Radiator of Transformer. If any leakage is detected seal it. procedures have to be followed before taking over the plant for the job. Transformer oil filtration is a process which involves removing impurities in the form of undissolved particles, dirt and water from the oil for increasing the overall insulating properties of oil. For each of the applications discussed above, the addition of a silica gel breather to the air transfer path will effectively protect the transformer/OLTC oil from ingress of moisture through air. 2. These dry beads absorb moisture and become green in colour when saturated with moisture. Abhinav Tewari. 14. In this type all the gel particles are impregnated with an indicator. Currently, EDP Distribuio has a pilot project to test a new type of air dryer with special silica that can be regenerated, or dried, resulting in an . Oil level in bushings. Vendor install the transformer at site after taking shutdown of respective 11 . Oil degradation produces water. Thus the silica gel breathers provide an economic and efficient means of controlling the level of the moisture entering the transformer or . The oil temperature is controlled by a special thermometer, which is located on the tank lid. Silica-gel and . All ZEOZORB transformer breathers use a visual sight window to indicate when replacement is necessary. Fredrik Backman. 4: 0: 4: . Supelco. Two-way, low pressure valves are fitted in the base plate of the breather to ensure that the atmospheric air enters the desiccant when a negative pressure differential occurs within the Transformer being protected. Eskom's planned load . Silica gel has an amorphous micro-porous structure. TLC Silica gel 60 F MSDS (material safety data sheet) or SDS, CoA and CoQ, dossiers, brochures . 2.8 SILICA GEL BREATHER Expansion and contraction of oil due to loading causes breathing. This now dry air will exit the breather into the transformer reservoir The desiccant will provide a color change from blue to beige, indicating the desiccant is saturated and should Self - Indicating Blue Silica Gel will adsorb moisture . In addition, testing shows that if the free air volume above the conservator tank oil is very dry, below 100 PPM, it will liberate and pull moisture from within the The desiccant contains blue and white crystals. The majority of Transformer Breathers used by the power generation industry contain indicating silica gel. As the air is drawn into the breather, the moisture is adsorbed. 13. Contains orange indicating beaded silica gel which turns green as it adsorbs moisture, indicating the need for replacement. A Man Called Ove: A Novel. Transformer oil filtration method. Zoom. In reality, a transformer is the heart that pumps electricity at a constant supply, saving the world from darkness, writes ESI Africa editor, Nicolette Pombo-van Zyl. If silica gel turns pink, it is replaced to guarantee reliable operation of the air dryer. Via the silica gel breather (dry silica gel is always blue). No vacuum is required with voltages up to 35 kV. Determine the amount of desiccant required using the "Silica Gel Requirement Chart" (see chart below) Often customers will use more desiccant than is required as a safety measure. Replace the silica gel if its color changes to pink. 1. The silica gel breather of transformer is very simple in the aspect of design. In Stock. Transformer oil iii) Silica gel iv) Kerosene v) Petrol TRANSFORMER LOCATION-POWER STATION TRANSFORMER CAPACITY (MVA/ KVA) Total cost (ksh) Number Amount in Litres/Kgs Location . Maintenance procedure // Maintenance should be performed on all parts of a power transformer: Oil; . The EZI-DRY Silica Gel breathers are designed to be installed on electrical transformers. If silica gel becomes pinkish, it should be replaced. PC1. Oil leakage 2. This condition could compromise the transformer insulation, which in turn could pose an obstacle to equipment maintenance. There is no set "time" for changing. 1 . 3. The sudden pressure relay has an inverse time characteristic. The takeup of moisture by the silica gel varies depending on a number of factors, including how humid the ambient atmosphere is (e.g., tropical moisture vs. arid region), time of year, temperature, how much actual airflow there is through the breather, etc. The gel removed from the breather may be arranged for regeneration and preserved for future use. The active part of the bushing consists of an oil Impregnated Paper (OIP) core manufactured from superior grade Kraft insulating paper with condenser graded layers for field control wound under tension on central tube/ conductor. Air will enter the base of the breather 2. This 3D animated video explains how a silica gel dehydrating breather works. Remove the moisture absorber from the transformer, pour out the internal adsorbent, check that the glass cover is in good condition, and clean it. . 5. Justin Taylor. It mainly includes the following aspects.