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Mohamed Alam

Mohamed Alam

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Viewing 20 posts - 1 through 20 (of 93 total)
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  • Mohamed Alam
    Member

    For cutting soluble oil (water-miscible coolant), the best “life-extension” setup is a side-stream filtration loop that combines a coarse prefilter (bag or wedge-wire screen), then fine depth filtration (cartridge or high-capacity bag, typically ~5-20 µm depending on nozzle/tooling sensitivity). If you’re fighting very fine grinding swarf, add a centrifugal separator or hydrocyclone ahead of the fine filters to reduce loading and keep ?P stable. To really extend coolant life, pair solids removal with tramp-oil removal (skimmer/coalescer) and-when needed-crossflow microfiltration/ultrafiltration to pull out sub-micron fines and emulsified contaminants without constantly dumping the sump.

    Mohamed Alam
    Member

    У наявних матеріалах GlobeCore прямо не позиціонує готове сертифіковане рішення саме для утилізації радіоактивних відходів, проте є обладнання і технологічні лінії, які застосовуються для обробки відходів і можуть бути частиною промислового процесу іммобілізації чи підготовки відходів до контейнеризації. Зокрема згадується AVSk‑150 (AVS‑вихрові шарові пристрої) — застосовуються для очищення стоків і обробки різних відходів (включно з потоками, що містять важкі метали), а також є згадки про можливості AVS у спеціальних задачах, пов’язаних із радіоактивними матеріалами. Крім того GlobeCore має обладнання для роботи з бітумними і полімерними сумішами — нагрівальні реактори, системи змішування і емульгування, що використовуються для битумізації, виробництва полімер‑модифікованих в’яжучих і захисних покриттів — технології, які часто входять до процесса іммобілізації та зовнішнього захисту контейнерів.

    Водночас у доступних фрагментах відсутні детальні технічні характеристики, вимоги безпеки та сертифікація для роботи з радіоактивними відходами, тому для практичної реалізації потрібні додаткові прояснення від GlobeCore та узгодження з регуляторами і ліцензованими фахівцями з ядерних відходів. Якщо потрібно, можу допомогти сформулювати технічний запит до GlobeCore (запит на технічні паспорти AVSk‑150, характеристики нагрівальних/битумних установок, дані по стійкості матеріалів до іонізуючого випромінювання, можливі приклади застосування) або підготувати список випробувань (гамма‑старіння, лебілюваність, проникність, міцність), які варто вимагати для оцінки придатності обладнання у вашому проєкті.

    in reply to: Why are transformers used in long-distance power lines? #332277
    Mohamed Alam
    Member

    Stepping to high voltage reduces current, minimizes I²R losses, improves efficiency, and reduces conductor size.

    in reply to: what determines the power rating of a transformer? #332131
    Mohamed Alam
    Member

    The power rating of a transformer is determined mainly by its thermal limits, which depend on allowable temperature rise in windings and insulation. Conductor cross section, core size, cooling method, insulation class and permissible losses all influence how much current and voltage the transformer can handle continuously. Standards define maximum temperature rises for different cooling and insulation classes. Designers select core and winding dimensions so that, at rated kVA, losses and resulting temperatures stay within those limits, ensuring acceptable life expectancy under normal operating conditions.

    in reply to: what is a power transformer used for? #332127
    Mohamed Alam
    Member

    A power transformer is used to transfer electrical power between circuits at different voltage levels while maintaining the same frequency. In power systems it steps up generator voltage to transmission levels, steps down transmission voltage at substations, and interconnects grids with different voltage classes. In industrial plants it feeds large motors and process loads at appropriate voltages. Power transformers also provide galvanic isolation, help manage losses by optimizing voltage levels, and support voltage control through tap changers, making them fundamental components of modern electricity networks.

    in reply to: what is power transformer and distribution transformer? #332101
    Mohamed Alam
    Member

    A power transformer is typically used at higher voltages and in transmission or bulk substation levels to transfer large amounts of power between different voltage tiers. A distribution transformer operates closer to end users, for example stepping medium voltage down to low voltage for homes or small industries. Power transformers are optimized for efficiency at or near full load, while distribution transformers are optimized for good efficiency at light to medium load where they operate most of the time. Their design, cooling, tap ranges and protections reflect these different roles in the system.

    in reply to: Where are Hawker Siddeley power transformers deployed? #331821
    Mohamed Alam
    Member

    These units saw use in UK and Commonwealth utility grids, industrial sites, and rail infrastructure for MV/HV distribution.

    Mohamed Alam
    Member

    Substations use power transformers with ratings matched to forecast peak loads, impedance levels for fault control, and cooling classes such as ONAN/ONAF/ODAF to dissipate thermal stress. Bus arrangements (single bus, double bus, breaker-and-a-half) provide flexibility for switching and reliability. Tap changers regulate voltage under load, and protection schemes such as differential, overcurrent, and Buchholz relays ensure fast isolation during faults. SCADA and digital monitoring track hot-spot temperatures, dissolved gases, and load profiles to keep the transformer within thermal and insulation limits during heavy duty cycles.

    Mohamed Alam
    Member

    Partial discharge is monitored using sensors, HF current transformers, RF antennas, and ultrasonic devices to detect insulation degradation.

    in reply to: What are the sources of power loss in a transformer? #331355
    Mohamed Alam
    Member

    Losses include core (hysteresis and eddy), copper losses, stray losses, dielectric losses, and cooling parasitics.

    Mohamed Alam
    Member

    Line transformers are mounted on poles or pad-mounted enclosures to step MV feeders down to LV service for neighborhoods and small commercial loads.

    Mohamed Alam
    Member

    It refers to the apparent power rating (kVA/MVA) a transformer can deliver at rated voltage and current without exceeding thermal and insulation limits.

    in reply to: What industries in China manufacture power transformers? #330901
    Mohamed Alam
    Member

    In China power transformers are manufactured by heavy electrical equipment industries that include large state owned enterprises, privately owned manufacturers and joint ventures. These industries are part of broader power equipment, grid technology and heavy machinery sectors. They supply domestic utilities, industrial customers and export markets. Manufacturing clusters often include facilities for core steel processing, winding fabrication, tank production and testing, supported by local supply chains for insulating materials and components like bushings and tap changers.

    in reply to: What does a power transformer image typically show? #330870
    Mohamed Alam
    Member

    Images show the tank, radiators, bushings, OLTC cabinets, nameplate, and connections, revealing cooling and voltage class characteristics.

    Mohamed Alam
    Member

    Grid voltage class, load profile, short-circuit duty, ambient temperature, cooling method, insulation level, efficiency requirements, noise limits, and standards (IEC/IEEE) define specifications.

    Mohamed Alam
    Member

    In practice, AVS works best with classical, well-known reagents whose kinetics benefit from intensification: iron salts (FeCl?, FeSO?) for co-precipitation of heavy metals and arsenic, lime or NaOH for pH control and hydroxide precipitation, sulfide reagents for soft metals, and oxidants/reductants such as hypochlorite, peroxide, or sulfite for redox conversion. The device does not require exotic chemicals; its advantage is that it makes standard chemistry react much faster and more completely. As for capacity, a single industrial AVS reactor typically handles from a few cubic meters per hour up to tens of m³/h, depending on model and reaction time. Large flows are achieved by parallel installation of multiple units, which is the normal scaling strategy.

    in reply to: Which power transformer manufacturers operate in Germany? #330726
    Mohamed Alam
    Member

    Germany hosts several manufacturers and engineering centers focusing on MV/HV transformers, distribution units, and specialty dry-type products. These firms serve local utilities, industrial customers, and export markets across Europe and beyond. Global OEMs also maintain design, testing, or manufacturing bases there. In practice, German transformer suppliers are known for high efficiency, strict adherence to IEC standards, and advanced monitoring and insulation technologies.

    in reply to: What power transformer types are used in substations? #330476
    Mohamed Alam
    Member

    Core-type, shell-type, autotransformers, step-up, step-down, and phase-shifting units are common depending on grid function.

    in reply to: Need price and on-site video for CMM-2 OCF model. #327484
    Mohamed Alam
    Member

    The CMM-2 CF oil purification system operates at 2 m³/h and is suitable for removal of moisture and particulate contamination. Demonstration videos and full specifications will be shared.

    Mohamed Alam
    Member

    GlobeCore offers high-vacuum oil purification systems (CMM-6 and CMM-10) meeting the requested performance. A quotation including specifications and vacuum parameters will be provided.

Viewing 20 posts - 1 through 20 (of 93 total)

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