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David Wilson
David Wilson
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January 28, 2026 at 5:48 am in reply to: How long does it take for the power company to fix a blown transformer? #332385David WilsonMember
Hours for small units; days-months for large HV/MV grid transformers depending on assets and availability.
David WilsonMemberPole/distribution transformers step medium voltage (e.g., 10-35 kV) to utilization voltage (120-400 V) for neighborhoods.
David WilsonMemberLosses = No-load (core + dielectric) + Load losses (I²R + stray + eddy). Expressed in W or kW and tested per IEC/IEEE standards.
David WilsonMemberBy function: GSU, step-down, autotransformer, furnace, traction. By insulation: oil-immersed, dry-type. By cooling: ONAN, ONAF, OFAF, OFWF, GIT.
David WilsonMemberA distribution transformer steps MV feeders to LV for end users; focus on high efficiency at light load.
January 26, 2026 at 10:21 am in reply to: Why does a power pole transformer require oil filtration and bushing inspections during field service? #332017David WilsonMemberOil filtration restores dielectric strength and removes moisture, particulates, and gases. Bushings are inspected for leakage currents, tracking, and contamination because bushing failures are a common cause of outages.
January 25, 2026 at 9:30 pm in reply to: What are Georgia Power transformer clearance requirements for safety? #331920David WilsonMemberUtilities like Georgia Power enforce minimum clearances for poles, pad-mounts, and substation equipment to prevent flashover, vegetation contact, and public access hazards. Clearances vary by voltage class, enclosure type, and NEC/NESC standards, covering horizontal/vertical separations, working space, and approach distances for maintenance crews.
January 25, 2026 at 2:13 am in reply to: What topics are covered in a power transformer technical presentation? #331773David WilsonMemberTechnical presentations focus on ratings, vector groups, applications, loss evaluation, tap changing, cooling, protection relays, testing, commissioning, and digital monitoring. They condense complex design/operation topics for utilities or industrial stakeholders.
January 24, 2026 at 10:53 pm in reply to: What role does a power substation transformer play in voltage distribution for utility grids? #331747David WilsonMemberSubstation step-down units convert transmission voltages to medium-voltage feeders for urban and industrial distribution.
January 24, 2026 at 6:30 pm in reply to: How does a solar powered transformer interface with renewable energy systems? #331713David WilsonMemberSolar power plants feed inverter outputs into step-up transformers that raise voltage to medium or high-voltage levels for grid interconnection. These transformers must tolerate harmonic-rich inverter waveforms, rapid ramping, and bi-directional power flow during curtailment. Cooling, insulation, and vector group selection are tailored to utility codes and grid-tie standards.
January 24, 2026 at 2:03 am in reply to: Where can power transformers for sale be procured for industrial use? #331573David WilsonMemberProcurement occurs via OEM bids, distributor quotations, EPC sourcing, or refurbishers offering tested and warranted second-hand equipment.
January 21, 2026 at 5:20 pm in reply to: Describe the basic principle of operation for the US-6S Transformer Vacuum Furnace. #330984David WilsonMemberOperation begins with loading the transformer’s active part onto a sliding carriage that enters the sealed furnace chamber. A vacuum is created, and a heating medium (technical oil or electric heaters) raises temperature within controlled limits. Pressure and temperature automation ensures even heating, moisture evaporation, vapor condensation, and safe system regulation until moisture removal targets are met.
David WilsonMemberIEC 60076 series, IEEE C57 series, ANSI, ISO quality systems, and utility internal specifications govern design, testing, and performance.
January 20, 2026 at 4:53 pm in reply to: Are there any GlobeCore solutions for online oil breakdown voltage testing? #330616David WilsonMemberYes – GlobeCore does offer solutions for measuring the breakdown voltage (BDV) of transformer oil, but they are separate instruments rather than a standard built-in feature of TOR-5. While TOR-5 is focused on online monitoring of key oil parameters (and can estimate BDV trends based on those measurements), dedicated GlobeCore testers like TOR-60, TOR-80/80A, and TOR-100 are used for direct dielectric strength/BDV testing of transformer oil according to IEC/ASTM standards. These instruments provide automated, accurate breakdown voltage measurements up to set kV levels and can produce reports and trend data for maintenance decision-making.
January 20, 2026 at 3:20 pm in reply to: What applications require an Eaton Cooper power series transformer? #330594David WilsonMemberEaton Cooper series units are widely deployed in utility distribution systems, pad-mount installations, and underground networks for commercial and residential service.
January 19, 2026 at 10:41 pm in reply to: What engineering challenges arise when designing a large power transformer for utility substations? #330418David WilsonMemberChallenges include managing thermal hotspots, dielectric clearances, fault forces, short-circuit withstand, acoustic noise, cooling system optimization, OLTC reliability, transport weight limits, and meeting strict loss guarantees and standards.
January 19, 2026 at 3:17 pm in reply to: What do power transformer pictures with names show about components? #330362David WilsonMemberAnnotated pictures label components such as core and coil assembly, HV and LV bushings, OLTC cabinet, conservator, radiators, pressure relief devices, Buchholz relay, and oil level indicators. Such diagrams help students and technicians correlate physical parts with schematic symbols and understand the roles of each component. They also highlight maintenance points and safety devices that must be regularly inspected, making them useful for training and documentation in utility and industrial environments.
January 9, 2026 at 5:13 pm in reply to: Start-up company looking for equipment for mixing and homogenizing bitumen, kerosene, acid, and amine. #329914David WilsonMemberFor a start-up making formulations that combine bitumen, kerosene, acids and amines you’ll want a compact, process-safe plant built around heated mixing vessels plus high‑shear homogenization and accurate dosing. Typical equipment includes insulated, steam- or electrically-heated stainless steel tanks with anchor agitators for low‑shear bulk blending and a rotor–stator disperser or colloid mill/inline high‑pressure homogenizer to produce stable emulsions and fine dispersions. Metering pumps for kerosene and liquid additives, pH and temperature probes, bag/inline filtration and vapor recovery or condensation for solvent control are essential for consistent product quality and environmental compliance.
Material compatibility and safety drive design choices: use 316L stainless for most components, PTFE or rubber linings and corrosion‑resistant alloys (or special coatings) where strong acids are handled, and select seals and pump materials rated for hydrocarbons and amines. Sequence and controls matter: heat bitumen to lower viscosity, add kerosene slowly under agitation, dose acid/amine and emulsifier with closed‑loop pH control, then pass the blend through the homogenizer to achieve target droplet size and viscosity. Monitor viscosity, softening point/penetration (for bituminous products), particle size and pH as your QC checks, and install ATEX‑rated motors, grounding and adequate ventilation because kerosene is flammable. If you want, tell me target batch size, throughput and whether you’ll produce cationic or anionic emulsions and I’ll suggest specific GlobeCore modules and a basic plant layout that fits your formulations and safety requirements.
November 11, 2025 at 1:40 am in reply to: We are currently in search of an oil degassing, vacuum purification unit suitable for hermetic transformers up to 22 kV and 2.5 MVA. The unit must filter, vacuum, and purify oil after gasket replacement on site. We are particularly interested in the CMM-0.6L model but open to other solutions. #327462David WilsonMemberThe CMM-0.6L transformer oil purification unit removes moisture, gases, and solid impurities and is ideal for servicing hermetic transformers up to 2.5 MVA. It can be supplied as a mobile or stationary version. Specifications and pricing will be shared.
November 10, 2025 at 11:03 pm in reply to: Request to print the user manual for the TOR-1 Oil Moisture Meter, previously purchased with the Transformer Oil Express Test Kit. #327452David WilsonMemberThe TOR-1 moisture meter manual can be provided in printable format. It includes calibration and operational guidelines.
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