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Christopher Hansen
Christopher Hansen
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Rating in kVA/MVA = V × I (1?) or ?3 × V × I (3?) at rated temperature rise, cooling class, and duty cycle.
PF = kW / kVA or PF = cos?. Measured by comparing real and apparent power using meters or power analyzers during OC/SC tests or in-service diagnostics.
Large substation/GSU units range from USD 1-20+ million depending on MVA, voltage, cooling, and standards.
Idle (no-load) losses depend on transformer size. Small low-voltage units may waste fractions of a watt to a few watts, while medium and large substation transformers can incur no-load losses in the tens to hundreds of kilowatts. No-load losses are dominated by core material and geometry.
一月 25, 2026 11:49 下午 回复至： What does a power transformer company manufacture for utility markets? #331937Utility-oriented firms supply medium and high-voltage step-up/step-down transformers, instrument transformers, and substation accessories built to IEC/IEEE standards for long-life grid operation.
一月 25, 2026 4:22 下午 回复至： What conditions must be met for power transformer parallel operation? #331883Transformers operating in parallel must have the same voltage ratio, vector group, phase sequence, and similar impedance and tap settings. kVA ratings should be reasonably matched to share load proportionally. Differences in impedance or ratio cause circulating currents and unequal load sharing, leading to overheating or protection misoperation. Proper phase checks, synchronization, and settings coordination are required before closing parallel breakers. Utilities follow detailed procedures to verify all conditions prior to enabling parallel operation on busbars.
Specification includes electrical ratings, insulation, tap range, cooling, losses, tolerances, standards, tests, accessories, protection interfaces and documentation. It ensures manufacturer alignment with utility requirements.
Same as above: diagnostics, mechanical and dielectric repairs, oil treatment, retesting, and recommissioning.
一月 23, 2026 10:11 下午 回复至： What is the difference between a power transformer vs a distribution transformer? #331545Power transformers interface generation to transmission and transmission to sub-transmission; distribution transformers step medium voltage down to LV for consumers. They differ in insulation levels, tap control, cooling, loss design and duty cycle.
Power analyzers or revenue meters measure voltage, current, and phase angle to compute PF under real operating conditions.
一月 22, 2026 1:00 下午 回复至： What does the symbol of a power transformer represent in circuit diagrams? #331259It represents coupled windings on a shared magnetic core that provide galvanic isolation and voltage transformation between circuits.
It manufactures large power transformers, distribution units, OLTC assemblies, bushings, monitoring accessories, and replacement parts used in transmission and distribution networks.
Yes, modifier dosage has a direct and often strong influence on curing time. Higher polymer content increases viscosity and swelling time, especially for SBS, so the digestion period must be longer to achieve full polymer swelling and phase inversion. At low dosages, curing may stabilize in tens of minutes, while at high dosages it can take several hours. That is why curing time is always optimized experimentally for each formulation, not fixed by temperature alone.
Temperature and humidity have a very strong influence on both oil and paper properties, often more through dynamics than through absolute values. Rising temperature increases oil’s water solubility, so the same moisture content in ppm can correspond to very different relative saturation and dielectric risk. At the same time, higher temperature accelerates oxidation of oil and hydrolytic aging of cellulose exponentially. Ambient humidity mainly affects the system through breathing and seals: moisture ingress slowly raises paper moisture, which then governs long-term dielectric strength and mechanical life. In practice, it is the combination of temperature cycles and moisture migration that drives most insulation aging, not either factor alone.
一月 19, 2026 4:00 上午 回复至： What information does a power transformer wiki typically summarize? #330286A power transformer wiki page typically summarizes definition, principle of operation, construction (core, coils, insulation, tank), cooling methods, efficiency, ratings, standards, common applications in transmission and distribution, and typical failure modes. It may also cover historical development and modern trends such as digital monitoring, higher voltage classes, and renewable integration. Such summaries are broad and educational, aimed at explaining how transformers fit into electrical power systems.
十一月 11, 2025 9:28 下午 回复至： Looking for price and application details for AVS-100 and AVS-150 for synthetic fuel production. #327539The AVS-100 and AVS-150 can be used for synthetic fuel production through cavitation-assisted emulsification and activation. AVS-150 is preferred for continuous high-load operation.
十一月 10, 2025 9:24 上午 回复至： Inquiry for transformer oil filtration machine with 1000 L/h capacity. #327382The CMM-1.0 system purifies 1000 L/h of transformer oil by removing moisture, gases, and solids. Specifications and quotation will be provided.
The UVR-0.1 unit regenerates up to 200 L of transformer oil per cycle. It can be configured for 480 V / 60 Hz operation. Degassing is performed within the same module; online monitoring can be added optionally. Technical and commercial details will be provided.
During diesel fuel regeneration, the CMM-6RL consumes approximately 50-65 kWh per ton of adsorbent, depending on process conditions. We will provide FOB pricing and technical specifications for this model.
Please provide the serial number or year of manufacture for your CMM-4.0T turbine oil filtration unit. We will send the correct operation manual and technical documentation in PDF format.
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