A voltage transformer, often called an instrument or potential transformer, is designed to reproduce system voltage at a lower, safe level for metering and protection devices with high accuracy and low burden. A power transformer is built to transfer significant power between circuits, prioritizing efficiency and thermal performance rather than precise ratio accuracy. Voltage transformers operate at low VA ratings and are part of measurement circuits, while power transformers handle kVA or MVA, feeding loads or other network sections. Their insulation, construction and testing requirements differ accordingly.

Urbanization, renewable integration, grid modernization, utility investment cycles, and regulatory efficiency mandates drive demand.

Total losses = core losses + copper losses; P_{loss} = P_{core} + I^2R plus stray and dielectric losses for detailed studies.

Parallel operation allows utilities to increase total kVA capacity, share load, improve redundancy, and maintain service continuity during maintenance. For safe paralleling, transformers must match in voltage ratio, vector group, impedance, and phase displacement. Mismatches cause circulating currents, thermal stress, and uneven load distribution. Parallel banks also enhance system flexibility for seasonal and industrial load variations.

Internal faults trigger protection that isolates the transformer and de-energizes downstream feeders, causing localized outages until switching restores service.

There is no method that can determine the exact average age of paper insulation, but there are well-established indirect techniques to estimate its remaining life. The most common is furan analysis of the oil, which correlates furan concentration with the degree of polymerization (DP) of cellulose. DP gives a good indication of mechanical aging. Additional methods include trend analysis of moisture, acidity, CO/CO? ratio in DGA, and historical thermal loading. These together allow a reasonable estimate of insulation aging, but never a precise «age» in years.

A current transformer for meters measures line current by scaling high primary currents to small secondary currents suitable for metering and billing. It maintains ratio accuracy and isolation for safe measurement.

The AVS-100 provides ultrafine pigment dispersion with uniform particle distribution. Typical particle size reduction is to 0.2-0.5 ?m. Throughput and energy data will be provided.

Both AVS-100 and AVS-150 electromagnetic mills work on the same vortex layer principle. The AVS-150 has a larger chamber volume, higher throughput, and more powerful inductor, allowing continuous operation with coarser materials or higher loads.

The TOR-80 is a semi-automatic breakdown voltage tester for insulating oils up to 80 kV. It conforms to IEC 60156 standards. We will send a quotation, brochure, and lead time information.