SG-20kVA 380V-380V
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Define the voltage ratio and system
State input voltage, output voltage, phase, frequency, neutral requirement, earthing arrangement and rated kVA. Identify whether the transformer supplies one machine, a group of loads, a drive system or a control network. Special ratios and multi-voltage requirements should be shown on a single-line diagram. Final feasibility, dimensions and test scope must be confirmed for the selected design.
Describe the real load
Motor starting, rectifiers, variable-frequency drives, UPS systems and other nonlinear loads can affect current waveform, heating and acoustic performance. Provide load type, harmonic information, starting current, peak demand, duty cycle and expected overloads. If electrostatic shielding or a particular neutral arrangement is required, include it in the RFQ rather than assuming it is standard.
Select construction and thermal limits
The offered winding material, insulation system, cooling method, temperature rise and enclosure should be matched to the duty and installation. Indoor electrical rooms, dusty workshops, high ambient temperatures and restricted ventilation create different design constraints. Provide room ventilation, ambient range, altitude, dust or moisture exposure and any dimensional limits so the technical review covers the actual site.
Plan protection and integration
The transformer must coordinate with upstream and downstream protection, cable sizes, inrush current and equipment insulation levels. Share the proposed breaker or fuse arrangement, fault level where relevant and any requirement for temperature sensors, surge protection, wheels, terminals or cable boxes. Approved drawings should show connection groups, terminals and installation clearances.
Agree performance and acceptance tests
The enquiry should define impedance, efficiency or loss expectations, temperature-rise limits, insulation tests, ratio and polarity checks, noise limits and any witness requirements. Existing test evidence may cover only a specific model, so every claim should be checked against the exact rating and report number. A single report must not be used to represent an entire product family.
Support OEM and project documentation
Industrial OEMs often need drawings, terminal plans, nameplate data, installation instructions and a repeatable configuration for future machines. State the expected annual volume, target equipment, approval process and change-control needs. For one-off projects, provide the site schedule and inspection requirements. This allows the technical and commercial response to reflect the intended supply relationship.
Request an isolation-transformer review
Send input and output voltage, phase, frequency, kVA, load type, harmonics, duty cycle, insulation and enclosure needs, ambient conditions, dimensions, protection concept, required tests, quantity and destination. LONTEN can then determine what additional information is needed and whether a documented configuration can be proposed.