Dry Type Isolation Transformer China

Load, Voltage and Site Data Determine Rated Capacity

This product range serves engineered three-phase projects from 100 kVA to 12 MVA rather than small plug-in isolation transformer applications. Start with continuous kVA, motor-starting or inrush duty, harmonic-producing loads, primary and secondary voltage, 50/60 Hz frequency, phase arrangement, vector group and grounding method. These inputs determine conductor size, core flux, impedance and the thermal margin required at rated load.

Site information covers indoor or outdoor location, ambient temperature, altitude, available ventilation, enclosure protection, cable-entry direction, lifting route and space limits. AN cooling suits installations with sufficient natural airflow; AF adds fans when the approved design requires more heat removal or controlled overload capability.

The quotation package converts those inputs into a rated capacity, voltage ratio, winding material, impedance, insulation class, temperature rise, enclosure, losses and overall dimensions. cnbbelc can also provide an outline drawing, terminal arrangement and proposed routine test schedule so the electrical and mechanical interfaces can be approved before manufacturing begins.

Galvanic Isolation Protects the Load; Cooling Protects the Transformer

Three functions should be specified separately. Galvanic isolation comes from physically separate primary and secondary windings. An optional grounded electrostatic shield can reduce capacitive coupling of common-mode electrical noise. The insulation, cooling and temperature-control system then keep the transformer itself inside its approved thermal limits.

A dry type transformer avoids insulating oil, but it still needs clear airflow and a clean installation environment. The project specification includes dust, humidity, salt mist, corrosive atmosphere, seismic duty and altitude before design. Isolation does not correct every voltage dip or harmonic problem; those performance requirements need their own winding, impedance, shielding or filtering provisions.

cnbbelc Engineers, Tests and Packs Each Transformer for the Project

cnbbelc configures rated capacity, primary and secondary voltage, vector group, impedance, copper or aluminum windings, taps, insulation class, AN/AF cooling, enclosure protection, temperature sensors, cable entry and installation dimensions around the approved system data. The same engineering process supports industrial drives, data centers, renewable-energy equipment, marine and shore-power projects.

Finished-unit verification can include visual inspection, winding resistance, voltage ratio and vector group, insulation resistance, impedance and load loss, no-load current and loss, applied-voltage and induced-voltage tests, plus partial-discharge measurement when required by the design. Each ordered configuration is released against its approved drawing and routine test report; witnessed or third-party tests can be added to the contract scope.

The base order quantity is one transformer. A preliminary proposal normally takes 3–5 working days, and the base production window is 30–45 working days after drawing approval and deposit. The unit is protected against moisture, secured to an export base or plywood package, and shipped with the approved drawing, nameplate data, routine test record and packing list.