Johannes

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Viewing 12 posts - 31 through 42 (of 42 total)
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  • Johannes
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    DBPC is an oxidation inhibitor added to transformer oil to slow down oxidation. It reduces acid formation, sludge buildup, and aging, thereby extending oil and insulation life under thermal stress.

    Johannes
    Participant

    Standard BDV values for serviceable oil are typically above 30 kV, while new oil often exceeds 60 kV, depending on test method and standard used.

    in reply to: What is the function of a transformer oil cooler? #3959
    Johannes
    Participant

    Oil coolers increase heat dissipation by transferring heat from oil to air or water. They maintain oil temperature within safe limits during high load or elevated ambient conditions.

    Johannes
    Participant

    The oil temperature sensor monitors top oil or winding temperature and sends signals for alarms, cooling system activation, or protective shutdown. It helps prevent overheating, insulation damage, and catastrophic transformer failures by ensuring operation within thermal limits.

    Johannes
    Participant

    An R-Temp MSDS typically covers hazard classification, routes of exposure, first aid measures, fire fighting guidance, spill response, handling and storage conditions, recommended PPE, and disposal considerations. For fire resistant fluids it will emphasize flash and fire behavior, ventilation, and compatibility guidance. It also lists physical properties, stability and reactivity, and regulatory information for transport and workplace compliance. Practical takeaways include avoiding skin and eye contact, preventing spills into drains, using absorbents for cleanup, and storing in sealed containers away from ignition sources.

    Johannes
    Participant

    Most electric transformers use mineral insulating oil, especially for conventional outdoor distribution and power transformers due to cost and proven performance. Increasingly, natural ester fluids and synthetic esters are used where fire safety and environmental performance are priorities. Silicone fluids are used in special fire safe applications. The chosen oil must meet the unit’s design approvals, dielectric requirements, thermal limits, materials compatibility, and regulatory constraints. Utilities also consider climate, maintenance strategy, and containment requirements when selecting the insulation liquid.

    Johannes
    Participant

    The same liquid can do both because its chemistry and dielectric behavior support high electric field withstand while also providing strong convective heat transfer. Oil circulates through internal ducts, removing heat from copper and paper insulation and carrying it to external radiators or coolers. Simultaneously, it fills voids and increases breakdown strength in critical clearances. This dual function enables compact, efficient transformer designs and reliable operation across load cycles.

    Johannes
    Participant

    Biotemp is commonly chosen where environmental risk from leaks and fire performance matter. It is a natural ester fluid designed to be readily biodegradable and to reduce the impact of spills compared with conventional mineral oil. Natural esters also typically have higher fire point than mineral oil, which helps in locations with strict fire safety requirements such as near buildings, forests, waterways, or critical infrastructure. These fluids can support longer insulation life in some regimes due to better moisture tolerance, but they must still meet applicable specifications and maintenance practices. [oai_citation:2?ASTM International

    Johannes
    Participant

    An oil filter machine removes contaminants through a combination of vacuum dehydration, filtration, and degassing. Moisture is extracted by heating the oil and exposing it to vacuum, allowing water vapor to evaporate at low temperatures. Solid particles are removed using fine filter elements that trap cellulose fibers, carbon residues, and metallic debris. Degassing eliminates dissolved air and fault gases. This process restores dielectric strength, improves heat transfer, and slows insulation aging, making filtration essential during maintenance and life extension programs.

    Johannes
    Participant

    Required dielectric strength varies by voltage class but typically exceeds 30-60 kV for standard test gaps. Values below limits indicate unacceptable insulation risk.

    Johannes
    Participant

    On site testers commonly measure dielectric breakdown voltage, moisture content, and sometimes temperature compensated conductivity or resistivity. Portable instruments may also assess dissipation factor or power factor, and can provide quick screening for contamination. Some field kits support basic dissolved gas screening, but full DGA usually requires lab analysis. On site results are useful for go no go decisions, post maintenance verification, and rapid assessment after events like overload, suspected moisture ingress, or oil handling operations.

    Johannes
    Participant

    Oil burner transformers are maintained through regular inspection of electrical connections, insulation integrity, and output voltage stability. Technicians check for cracks, carbon tracking, moisture ingress, and overheating. Spark gap alignment and electrode condition are also verified. Periodic testing ensures the transformer delivers sufficient voltage for ignition. Preventive replacement is common because declining transformer performance can lead to ignition failure, misfires, and increased burner downtime.

Viewing 12 posts - 31 through 42 (of 42 total)

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