placeholder · competitor · lteindia.in (Lakshmi Transformers & Electricals)LT Transformers and Inductors (50Hz / 60Hz / 400Hz)
LT (low-tension / low-voltage) transformers and inductors are line-frequency magnetic components built for power, isolation, step-up/step-down and auto-transformer duty on low-voltage systems, offered for 50 Hz, 60 Hz and 400 Hz operation.
Overview
LT (low-tension / low-voltage) transformers and inductors are line-frequency magnetic components built for power, isolation, step-up/step-down and auto-transformer duty on low-voltage systems, offered for 50 Hz, 60 Hz and 400 Hz operation. The 400 Hz option is notable: aircraft, marine, military and ground-power-unit systems run at 400 Hz, which allows smaller, lighter cores than 50/60 Hz for the same rating, and ACE supporting all three frequencies signals capability across industrial, export (60 Hz markets) and aerospace/defence ground-power applications. These are typically dry-type units (open/ventilated, resin-encapsulated or VPI) with copper or aluminium windings, made to the customer's voltage, vector group and rating. The companion inductors/reactors are wound on gapped or ungapped cores for filtering, smoothing or current limiting. A buyer specifies a custom LT transformer when standard distribution units do not match their voltage combination, frequency, taps, enclosure or duty.
Specifications
| Rating | from a few VA/kVA up to several hundred kVA / few MVA (design-dependent) |
|---|---|
| Frequency | 50 Hz, 60 Hz or 400 Hz |
| Phases | single-phase or three-phase |
| Voltage class | low-tension (typically up to 1.1 kV, LV side commonly 415 V / 240 V / 110 V etc.) |
| Type | isolation, step-up/step-down, auto-transformer, multi-tap |
| Vector group (3-ph) | e.g. Dyn11, Yyn0 etc. |
| Cooling/construction | dry-type AN (air-natural), VPI or cast/encapsulated resin |
| Insulation/thermal class | B / F / H |
| Taps | off-circuit tap changer (e.g. ±5% in 2.5% steps) |
| Impedance (%Z) and regulation per requirement | |
| Enclosure / IP rating and indoor/outdoor mounting | |
| Standards | IS 11171 / IS 2026 / IEC 60076 (dry-type IEC 60076-11) |
Applications
- Industrial and building LV power distribution
- Isolation and step-up/step-down for machinery and panels
- 60 Hz export equipment and OEM builds
- 400 Hz aircraft / marine / defence ground-power systems
- Filtering / smoothing inductors and reactors
- Custom OEM transformer requirements
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