×
  • 您需要先登录才可以创建新话题。

Sandra Green

Sandra Green

已创建论坛回复

正在查看 20 个帖子:1-20 (共 90 个帖子)
  • 作者
    帖子
  • Sandra Green
    会员

    For sesame grinding (tahini), a rotor-stator colloid mill is one of the most practical technologies because it gives stable ultra-fine paste, high throughput, and consistent texture. I’d recommend GlobeCore CLM-series colloid mills: they are designed for producing nut/seed pastes and emulsions with adjustable rotor-stator gap and strong shear for uniform dispersion. For quality and efficiency, focus on stainless food-grade construction, stable temperature control (jacket/cooling to avoid flavor loss), easy cleaning, and the ability to run in a recirculation loop to reach the target fineness without overheating.

    Sandra Green
    会员

    For heavy-duty hydraulic oil and ?5,000 L/day, a GlobeCore CMM-series unit works well. A portable CMM-4.0F does robust particle removal (cartridge filters ~5 µm) at flow rates above your target. For moisture removal add a CMM-LT model with multistage filtration (down to ~1-3 µm). Prices vary by specs, typically mid-range industrial equipment depending on options and flow.

    回复至: What is MVA power transformer? #332183
    Sandra Green
    会员

    An MVA power transformer is a high-capacity transformer rated in megavolt-amperes, typically used in transmission and sub-transmission grids. Ratings from 10 to 1,000 MVA are common for generation step-up units, autotransformers, and large substation transformers. The MVA metric captures thermal load capability and reflects both voltage and current handling. Such transformers are designed for high insulation strength, robust cooling systems (ONAN/ONAF/ODAF), on-load tap changers, and strict short-circuit withstand requirements.

    回复至: What is a power factor test of a transformer? #332179
    Sandra Green
    会员

    A power factor test measures dielectric losses in a transformer’s insulation system. It applies an AC voltage to windings, bushings, and insulation interfaces, then calculates the ratio of real power (losses) to apparent power. A lower power factor indicates healthy insulation with minimal leakage currents, while higher values suggest moisture ingress, thermal degradation, or contamination. Utilities run this test during commissioning and periodic maintenance to trend insulation aging and predict failures. It is considered a key diagnostic alongside DGA, tan delta, and insulation-resistance measurements.

    回复至: what is silica gel used in power transformer? #332165
    Sandra Green
    会员

    Silica gel is used in the breather of oil filled power transformers to dry the air that enters the conservator as oil volume changes with temperature. Moisture in air can be absorbed by the insulating oil and paper, degrading dielectric strength and accelerating aging. The breather forces incoming air to pass through silica gel crystals, which adsorb moisture. When saturated, the crystals change color, indicating the need for replacement or regeneration. Maintaining dry air in the conservator system is a simple but important part of transformer maintenance.

    回复至: Why does a power plant use a step up transformer? #332013
    Sandra Green
    会员

    Power plants generate electricity at relatively low voltages for generator efficiency. Step-up transformers raise voltage to HV/EHV levels (110-765 kV) for transmission. Higher voltage reduces line current and I²R losses over long distances, improving efficiency and lowering conductor costs.

    回复至: how to build a power transformer? #331997
    Sandra Green
    会员

    The build process follows design ? core lamination ? winding ? insulation ? mechanical assembly ? oil processing ? electrical testing ? logistics. High-voltage units require compliance with insulation coordination and dielectric standards (IEC/IEEE).

    回复至: what’s a transformer power? #331981
    Sandra Green
    会员

    “Transformer power” usually refers to the rated capacity of the transformer, expressed in kVA or MVA. The rating indicates how much load the transformer can carry continuously without exceeding thermal and insulation limits. Rating depends on core size, winding gauge, cooling method, and impedance.

    Sandra Green
    会员

    Three-phase transformers use delta or wye windings to match industrial distribution systems. They balance phase currents, support motor loads, and provide fault withstand capability.

    回复至: How does a power surge damage a transformer? #331761
    Sandra Green
    会员

    Surges from lightning or switching create overvoltages that stress insulation, cause partial discharge, or puncture windings and bushings. Repeated surges accelerate aging.

    Sandra Green
    会员

    Suppliers manage specification, bidding, factory testing, logistics, installation, tap settings, and commissioning support.

    回复至: What industries require STW industrial power transformers? #331741
    Sandra Green
    会员

    STW industrial power transformers, such as those referenced in gaming titles or real equipment branding, are associated with heavy industrial loads. Likely sectors include manufacturing, mining, process industries and large commercial infrastructure that need robust transformers for internal distribution. In some contexts the name appears in entertainment or training materials that simulate transformer assets. Real world industrial transformers labeled similarly would be used wherever rugged, high reliability power conversion is critical for continuous operation.

    Sandra Green
    会员

    Sensors track winding hot-spot temperatures, oil temps, and dissolved gases; SCADA trends alarm thresholds for proactive maintenance.

    回复至: How does a power transformer work in electrical networks? #331117
    Sandra Green
    会员

    It enables efficient transfer by stepping up for transmission and stepping down for consumption, conserving frequency and kVA.

    回复至: Which industries in China use power transformers? #330916
    Sandra Green
    会员

    In China, power transformers are ubiquitous across transmission and distribution utilities, heavy industry (steel, petrochemicals, mining, cement), rail and metro systems, data centers, manufacturing parks, and large commercial complexes. Renewable energy bases (wind, solar), industrial clusters, and export-oriented factories all rely on MV/HV transformers. The rapid growth of infrastructure, electrified transport, and high-tech manufacturing keeps demand high for both large grid transformers and industrial distribution units.

    Sandra Green
    会员

    Heat dissipation is governed by winding and core losses and the ability of the cooling system to remove that heat. Radiators, fins, oil pumps, and fans increase surface area and convection. Internal oil channels, ducts, and winding spacers guide coolant through hotspots. Tank design, ambient conditions, and enclosure type all affect heat transfer. Insulation materials must tolerate operating temperatures, so thermal design balances loss generation with efficient heat removal to keep hot-spot temperatures within insulation class limits.

    Sandra Green
    会员

    In normal practice there are no strict limitations on taking oil samples while TOR-5 is connected, as long as sampling is done correctly from a dedicated sampling valve. The system is designed to work in parallel with routine diagnostics, and temporary sampling does not disturb its measurements. The main precautions are to avoid introducing air, moisture, or particles into the circuit and to ensure the flow is stabilized after sampling. Poor sampling technique can influence moisture or gas readings for some time, so flushing the valve and allowing the system to re-equilibrate is important.

    Sandra Green
    会员

    Yes, the adsorber cartridges used in TOR-5 are designed to be regenerable, which is an important part of the system’s operating economy. The zeolite sorbent does not have to be replaced after each saturation cycle; instead, it can be regenerated by controlled heating and purging to remove the absorbed moisture. In practice, regeneration is usually done off-line at a service facility or with dedicated regeneration equipment. This allows the same cartridges to be reused multiple times while maintaining stable drying performance over long-term operation.

    回复至: What drives the cost of power transformers for utilities? #330478
    Sandra Green
    会员

    Cost drivers include MVA rating, voltage class, cooling system, core material, copper/aluminum content, OLTC type, testing requirements, standards compliance, logistics, and custom engineering. Market copper prices and lead times also influence cost.

    Sandra Green
    会员

    A power conditioner transformer provides isolation and voltage adaptation while improving power quality for sensitive loads. It can be integrated into systems that include filtering, surge suppression and voltage regulation. The transformer part helps attenuate common mode noise, reduce ground loop issues and provide a low impedance source at the utilization voltage. In data centers, laboratories, medical facilities and audio studios it helps protect equipment and maintain stable operation under disturbed utility conditions.

正在查看 20 个帖子:1-20 (共 90 个帖子)

Sign up

Sign in

To continue log in with Google.