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吉田 陽一
吉田 陽一
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吉田 陽一会员
For turbine lubricants with viscosity from 10 to 2000 mm²/s and flow ?60 L/min, a reliable solution is vacuum dehydration and filtration using GlobeCore equipment. Units like the CMM series combine heating, vacuum degassing and fine filtration, allowing removal of free and dissolved water, gases and particles while stabilizing oil properties. This approach is far more effective than simple filtration for long-term oil conditioning in power plants.
吉田 陽一会员Ferromagnetic steels concentrate magnetic flux, reducing magnetizing current and enabling efficient voltage transformation. Modern cores use grain-oriented silicon steel or amorphous metal for minimal hysteresis and eddy losses.
吉田 陽一会员Power factor is calculated as PF = kW / kVA. For transformers, PF reflects load characteristics rather than the transformer itself. Under no-load, PF is low due to magnetizing current and core losses; under load, PF depends on downstream inductive or capacitive equipment. Utilities use PF in loss calculations, billing, and reactive power compensation.
吉田 陽一会员A power pole transformer is a small distribution transformer mounted on utility poles that steps medium voltage down to low voltage for homes and businesses. Medium voltage from overhead lines feeds its primary winding. The transformer’s core and windings convert this to lower voltage on the secondary, typically arranged in single phase or split phase for residential service. The tank is oil filled for insulation and cooling, and bushings connect primary and secondary conductors. Protective devices such as fuses and lightning arresters are installed nearby to protect against faults and surges.
吉田 陽一会员The fuse protects the transformer from overcurrent and fault conditions on the secondary or internal failures. It interrupts current before thermal damage, limiting fault energy and preventing pole equipment destruction.
一月 25, 2026 2:29 上午 回复至: What does the technical specification of a power transformer include? #331775吉田 陽一会员Technical specifications include kVA/MVA rating, primary and secondary voltages, vector group, frequency, cooling class (ONAN/ONAF/ODAF), impedance, losses, insulation level/BIL, tap-changer type, temperature rise, bushings, protection accessories, and applicable standards (IEC/IEEE). Specs define how the transformer integrates into a grid or industrial system and set procurement and testing requirements.
一月 22, 2026 8:15 上午 回复至: What does a winding resistance test on a power transformer measure? #331203吉田 陽一会员It measures conductor integrity, joint quality, and OLTC contact condition. Variations indicate loose joints, carbonized contacts, or winding damage.
一月 22, 2026 6:40 上午 回复至: What is the description of a power transformer in grid applications? #331181吉田 陽一会员It is described as a core component that transfers bulk power, controls voltage, isolates sections and supports stability through impedance and tap control.
吉田 陽一会员DC converter transformers benefit from proper tap settings to optimize voltage regulation and reduce conduction losses. Thermographic inspections reveal hotspots in windings, bushings, and OLTC contacts, allowing proactive corrective maintenance and extending insulation life.
一月 20, 2026 12:00 上午 回复至: What types of power transformer connection are used for three-phase circuits? #330428吉田 陽一会员Common three-phase groups include Y-Y, ?-?, Y-?, ?-Y, and zig-zag variants, chosen for grounding, phase shift, and harmonics.
吉田 陽一会员CG-branded power transformers originated from Crompton Greaves/CG Power, a company known for manufacturing distribution, medium power, and large power transformers for utilities and industry. Over time, ownership and branding structures have evolved, but CG-type transformers generally refer to products from a manufacturer specializing in MV/HV equipment, with factories and service centers focused on IEC/IEEE-compliant designs for international markets.
一月 19, 2026 6:43 下午 回复至: What is the difference between an autotransformer and a power transformer? #330388吉田 陽一会员Autotransformers share windings between primary and secondary with no full isolation; power transformers have separate windings for galvanic isolation and improved insulation.
一月 18, 2026 10:16 下午 回复至: What does a Hammond Power Solutions transformer wiring diagram show? #330254吉田 陽一会员A Hammond wiring diagram shows primary and secondary winding configurations, tap leads, grounding points, and recommended connection schemes for different input and output voltages. It indicates terminal markings, phase relationships, and sometimes vector groups, enabling installers to configure series or parallel connections correctly. The diagram also highlights shielding, dual or multiple primaries/secondaries, and any connection precautions. This ensures safe installation, correct voltage outputs, and proper phasing in industrial panels or equipment.
吉田 陽一会员150 MVA class transformers are used in transmission and sub-transmission substations, large industrial complexes, HVDC converter terminals, and large renewable export substations. At this capacity level they support significant load blocks and provide grid interconnection between 110-400+ kV classes depending on regional standards.
吉田 陽一会员GlobeCore provides oil testing equipment including kinematic viscosity meters for transformer and turbine oils. The requested specifications match the automatic KV-5000 class. A quotation with warranty, calibration standards, and service details will be provided.
吉田 陽一会员The UVR and CMM-R series regeneration systems remove acids, sludge, and other degradation products from transformer oil, restoring its chemical and dielectric properties. The regenerated oil can be reused in various industrial applications.
吉田 陽一会员GlobeCore stationary vacuum drying units remove moisture from transformer cores and windings through controlled heating and deep vacuum. Installation requires standard electrical and oil-circulation connections. Operation includes heating, vacuum stage, and monitoring cycle. The unit can be customized for 60 Hz supply, but 120 V is insufficient for heating; a 3-phase 400-480 V source is required.
吉田 陽一会员The TOR-80 measures breakdown voltage of transformer oil up to 80 kV. It is semi-automatic and conforms to IEC 60156 standard. We can provide pricing and technical datasheet upon request.
吉田 陽一会员Yes. Although GlobeCore does not repair welding transformers, we supply oil purification and drying systems used by service centers that maintain oil-insulated welding equipment and power transformers.
九月 15, 2025 7:47 上午 回复至: What is transformer oil reconditioning and how is it different from purification? #325394吉田 陽一会员Reconditioning includes deep adsorption treatment to restore oil properties, not just remove particles or moisture. GlobeCore’s CMM-R units recondition oil onsite – making old oil usable again per IEC 60422.
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