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Olga Ivanova
Olga Ivanova
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January 21, 2026 at 7:12 am in reply to: Does the permissible moisture level depend on the type of fluid used in the transformer? #330821Olga IvanovaMember
Yes, the permissible moisture level depends very strongly on the type of insulating fluid, and this is a critical point in modern diagnostics. Mineral oil has relatively low water solubility, so even 20-40 ppm can represent a high relative saturation at low temperature and a real risk for paper wetting. In contrast, natural and synthetic esters dissolve much more water, so values of 200-400 ppm or more can still correspond to a safe relative saturation. That is why absolute ppm limits are misleading across fluids. For all fluids, the correct criterion is relative saturation or water activity, not ppm, and alarm thresholds must be adapted to the specific oil type.
January 20, 2026 at 6:40 pm in reply to: I have a transformer in operation with a moisture content of 40 ppm at 65 °C. The tan delta value is also greater than 1. The degree of polymerization is 520. What is your opinion on this? Would an online dryer from GlobeCore be a solution in this case? #330642Olga IvanovaMember40 ppm at 65 °C is not critical for moisture, because at this temperature the oil saturation level is high and relative saturation is likely low. The more serious concern is tan delta > 1, which usually indicates oxidized or contaminated oil, high acidity, or conductive aging products. DP = 520 means the paper is aged but still serviceable, so slowing further aging is important. An online dryer can help stabilize moisture and protect the paper, but it will not correct a high tan delta. First, check TAN, IFT, resistivity, and DGA. If oil quality is poor, oil reclamation or replacement is needed before relying on online drying.
January 20, 2026 at 2:39 am in reply to: What role does a control power transformer play in low voltage control circuits? #330448Olga IvanovaMemberControl transformers supply stable low-voltage AC for relays, contactors, and control logic isolated from MV/HV feeders.
January 19, 2026 at 5:24 pm in reply to: Where are Areva power transformers deployed in utility networks? #330378Olga IvanovaMemberAreva transformers (heritage now in GE Grid) were widely deployed in transmission and sub-transmission infrastructure, HV substations, nuclear plants, and industrial complexes that require long-life transformer fleets.
January 19, 2026 at 4:05 pm in reply to: How does step up transformer operation affect power consumption? #330368Olga IvanovaMemberApparent power is conserved minus losses; stepping up increases voltage while decreasing current, not creating power. Losses arise from copper, core, and stray effects.
November 12, 2025 at 6:30 pm in reply to: Interested in importing CRS-2 asphalt emulsion for road surface projects. Need price per drum, minimum quantity, and delivery time to Chile. #327641Olga IvanovaMemberThe CRS-2 cationic bitumen emulsion can be supplied in 200 L drums. Product meets ASTM and EN standards. Pricing and logistics depend on volume and shipment terms.
November 11, 2025 at 3:46 am in reply to: Order confirmation message for vacuum pump CP-10 with electric motor. #327470Olga IvanovaMemberThe order has been received and is being processed. Delivery will follow the standard timeline. For future orders, technical data and user manuals can be provided upon request.
November 8, 2025 at 6:29 am in reply to: Inquiry for Hot oil spray drying plant for transformers #327188Olga IvanovaMemberGlobeCore designs hot-oil spray drying systems for transformer cores and windings. These units use heated oil circulation and vacuum to remove moisture efficiently. Please provide transformer dimensions and available power supply for a detailed offer.
Olga IvanovaMemberGlobeCore manufactures oil purification systems (CMM and CFU series) for transformer, turbine, and hydraulic oils. Please provide oil type, contamination level, and required flow rate for a quotation.
Olga IvanovaMemberFor integration into existing systems, GlobeCore recommends modular CMM-series oil filtration units. These systems can be connected inline for transformer or industrial oil purification, removing moisture, gases, and solid impurities. Please specify the flow rate and oil type for selection.
November 7, 2025 at 1:30 am in reply to: Please send me a quotation for one piece CMM-0.6L oil degassing filtration cart. Shipping Monterrey, Nuevo Leon Mexico #327066Olga IvanovaMemberThe CMM-0.6L is a compact mobile oil filtration and degassing cart with 600 L/h capacity. We will include quotation with shipping options to Monterrey, Mexico.
September 17, 2025 at 4:53 pm in reply to: What is online transformer oil filtration and when should it be done? #325621Olga IvanovaMemberIt’s a method of filtering and dehydrating transformer oil without shutting down the transformer. GlobeCore’s online filtration machines maintain oil quality under load, preventing costly outages and extending equipment life.
September 17, 2025 at 3:43 pm in reply to: How is transformer oil testing done and why is it important? #325615Olga IvanovaMemberTesting includes BDV, moisture, acidity, interfacial tension, and gas content. GlobeCore’s solutions support both field and lab testing – allowing data-driven maintenance planning and faster fault detection.
Olga IvanovaMember“Maintenance des transformateurs” is French for transformer maintenance. GlobeCore works with clients worldwide – offering equipment, training, and French-language support for oil processing and maintenance operations.
Olga IvanovaMemberMobil DTE 732 M2 is a heavy-duty turbine oil for combined-cycle plants, designed to handle high thermal stress. GlobeCore filtration plants clean and dry DTE 732 M2, ensuring reliable lubrication and cooling.
August 5, 2025 at 2:06 am in reply to: What is Conoco Turbine Oil 32 and how is it maintained? #323884Olga IvanovaMemberConoco Turbine Oil 32 is a light-viscosity lubricant for gas turbines and hydraulic systems. GlobeCore treatment plants filter and degas Conoco 32, maintaining its stability under thermal stress.
August 4, 2025 at 10:26 am in reply to: Why use Supco Zoom Spout turbine oil and how is it serviced? #323790Olga IvanovaMemberSupco Zoom Spout is a light, non-gumming turbine oil commonly used for HVAC motors, fans, and small machinery. GlobeCore treatment units keep Zoom Spout oil free of particulates and moisture during use and storage.
August 4, 2025 at 1:06 am in reply to: Why use Eastman Turbine Oil 2380 and how is it processed? #323722Olga IvanovaMemberEastman 2380 is preferred in aviation for its low deposit formation and high-temperature resistance. GlobeCore regeneration units remove dissolved gases and water, ensuring the oil’s longevity.
August 3, 2025 at 11:06 pm in reply to: What is turbine lubricating oil and how is it maintained? #323710Olga IvanovaMemberTurbine lubricating oil reduces friction, cools moving parts, and prevents corrosion in rotating machinery. GlobeCore treatment systems remove water, acids, and solids, extending the oil’s efficiency and life span.
August 2, 2025 at 3:06 pm in reply to: Transformer me kaun sa oil dala jata hai? (Which oil is filled in transformers?) #323518Olga IvanovaMemberTransformers are typically filled with mineral oil, though ester and silicone oils are also used for specialized applications. GlobeCore purification systems process all these oil types, keeping them clean and compliant with standards.
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