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Li Wei
Li Wei
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Li WeiMember
GlobeCore does offer calcium carbonate grinding and dispersion using its AVS / AVSp vortex layer technology, which is shown in their videos for fine and nano-scale processing. However, achieving a guaranteed D90 = 200-300 nm is not a standard specification and strongly depends on the process setup: wet operation, use of dispersants, multiple passes in recirculation mode, cooling, and PSD measurement method. For nano-range targets, GlobeCore typically recommends AVSp units for lab/pilot trials, followed by industrial AVS units once the recipe is proven.
Li WeiMemberPower transformers are rated primarily in kVA/MVA at specific voltage, frequency, cooling class, impedance, temperature rise, and vector group. The rating defines continuous thermal capability without exceeding insulation class. Short-circuit withstand, tap-changer range, sound level, and efficiency parameters are also specified. Nameplates summarize values required for system design, protection coordination, and procurement.
Li WeiMemberWind turbines convert kinetic energy into mechanical rotation, which drives a generator producing electricity. Step-up transformers increase voltage for collection grids and transmission. Substations then integrate generated power into national grids.
January 26, 2026 at 3:09 am in reply to: What power transformer components affect insulation performance? #331961Li WeiMemberWindings, paper/oil insulation system, bushings, barriers, spacers, and OLTC compartments determine dielectric strength and moisture tolerance.
January 24, 2026 at 12:04 pm in reply to: Which sectors use Schneider Electric power transformers? #331663Li WeiMemberSchneider Electric transformers are used in commercial buildings, hospitals, data centers, industrial plants, mining, oil and gas, infrastructure projects, and secondary substations. Their portfolio focuses on MV/LV distribution, dry-type and oil-filled units packaged with switchgear and protection. Sectors value integrated solutions where transformers, switchboards, protection relays, and digital monitoring are sourced from a single vendor for easier engineering, commissioning, and lifecycle maintenance.
January 24, 2026 at 8:13 am in reply to: How does Hyundai Power Transformers USA Inc perform acceptance testing before commissioning high voltage transformers into utilities? #331621Li WeiMemberRoutine and type testing under IEEE/IEC includes ratio, impedance, dielectric, partial discharge, temperature rise, impulse, and oil analysis. Reports are certified for utility acceptance.
January 24, 2026 at 4:21 am in reply to: How is a single phase power transformer reconditioned during scheduled service intervals? #331591Li WeiMemberReconditioning may involve DGA, oil filtration or replacement, bushings inspection, OLTC servicing, drying or vacuum treatment to remove moisture, and tightening of mechanical clamping. Components with insulation degradation or hotspots are replaced.
January 24, 2026 at 1:32 am in reply to: What determines power transformers prices in industrial procurement? #331569Li WeiMemberPrices are shaped by rating, voltage class, loss guarantees, customization, and manufacturer competition. Industrial buyers often evaluate total owning cost, so suppliers may offer multiple loss combinations affecting both purchase price and efficiency. Additional factors include regional labor costs, logistics, currency fluctuations, and the scope of testing and documentation required. Long-term service, spare parts packages, and on-site support can be bundled into pricing for complex industrial projects.
January 23, 2026 at 8:23 pm in reply to: Why are power transformers essential for long-distance power transmission #331531Li WeiMemberPower transformers are essential because they allow voltage to be stepped up for transmission and stepped down for distribution. High voltage means lower current for the same power, which dramatically reduces I²R losses and permits smaller conductor sizes and longer distances. Without transformers, transmitting large amounts of power over hundreds of kilometers would be inefficient and uneconomical. They also provide galvanic isolation, help control system voltages and enable the interconnection of networks with different voltage levels.
January 23, 2026 at 1:58 pm in reply to: What formulas are used to calculate power transformer performance? #331463Li WeiMemberPerformance uses S = VI, efficiency eta = P_{out}/P_{in}, losses (core + I^2R), impedance Z = V/I, and regulation Delta V = (V_{nl}-V_{fl})/V_{fl}.
January 22, 2026 at 4:33 am in reply to: What does a power transformer maintenance checklist include? #331151Li WeiMemberIt includes oil sampling, DGA, insulation tests, bushing inspection, OLTC service, cooling checks, grounding verification, and visual inspections.
January 21, 2026 at 10:45 pm in reply to: When are power line isolation transformers used for noise and safety? #331068Li WeiMemberIsolation transformers on MV/LV interfaces or sensitive equipment reduce common-mode noise, provide galvanic isolation, and improve safety and grounding schemes.
January 21, 2026 at 2:34 pm in reply to: What is the definition of a power transformer in grid terminology? #330943Li WeiMemberIn grid terminology it refers to step-up or step-down units used between generation, transmission and distribution voltage levels for efficient bulk power transfer.
January 21, 2026 at 12:11 pm in reply to: Which sectors use power transformers in Australia? #330892Li WeiMemberIn Australia, power transformers are used by transmission and distribution utilities, mining and resources (iron ore, coal, LNG), heavy industry, rail and metro, ports, data centers, large commercial developments, and renewable energy projects (solar and wind farms). They appear in bulk supply points, zone substations, mine site substations, and industrial plants, stepping voltages between 66-500 kV transmission levels and medium or low voltage networks feeding urban loads and remote operations.
January 20, 2026 at 4:30 am in reply to: What losses typically appear in a power transformer? #330462Li WeiMemberCore (hysteresis + eddy), copper (I²R), stray, dielectric, mechanical vibration, and cooling system losses.
January 20, 2026 at 4:14 am in reply to: What factors determine the cost of a power transformer? #330460Li WeiMemberCopper/aluminum content, core steel quality, OLTC complexity, voltage class, MVA rating, cooling system, testing requirements, logistics, and commodity prices drive cost.
January 19, 2026 at 1:51 am in reply to: What does a power factor test for a transformer measure? #330274Li WeiMemberA power factor (PF) test measures dielectric losses in insulation systems of a transformer. By applying a voltage and comparing active to reactive power, technicians evaluate moisture ingress, contamination, aging, or carbonization in oil, paper, bushings, and winding insulation. Low PF indicates healthy insulation; elevated PF suggests deterioration and the need for further diagnostics.
November 12, 2025 at 7:55 pm in reply to: Interested in bitumen emulsion plant for chip seal application. #327651Li WeiMemberThe USB-2/8 emulsion plant produces cationic emulsions ideal for chip seal work with 2-8 t/h capacity and stable emulsion output.
November 10, 2025 at 3:10 pm in reply to: Request for quotation for the TOR-80 oil breakdown voltage tester, including payment terms and delivery time. #327416Li WeiMemberThe TOR-80 breakdown voltage tester measures dielectric strength of transformer oil up to 80 kV in accordance with IEC 60156. Pricing, delivery, and payment terms will be provided.
November 8, 2025 at 10:41 am in reply to: I would like to get a commercial offer for CMM-6RL Transformer Oil Regeneration Unit. Thank you. #327204Li WeiMemberThe CMM-6RL is a regeneration plant for transformer oil with 6 m³/h capacity. It removes acids, oxidation products, and moisture, restoring dielectric strength and color. We will prepare a commercial quotation with technical data and delivery schedule.
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