The SGG-40KVA is a three-phase dry-type isolation transformer providing complete galvanic separation between primary and secondary windings. Unlike autotransformers, it suppresses common-mode noise, blocks voltage transients and eliminates ground-loop interference. Built with F-class insulation, grain-oriented silicon-steel laminations and an electrostatic shield, it delivers ≥95% efficiency, pure sinusoidal output and a 20-year design life.
Ideal for precision CNC machinery, medical diagnostic equipment, semiconductor fabrication, data centre power conditioning, telecommunications, laboratory instruments and any environment where ground-loop elimination and transient protection are critical.
Full Galvanic Isolation: No direct electrical path between primary and secondary
Electrostatic Shield: >60 dB common-mode noise attenuation
High Efficiency: ≥95% with pure sinusoidal output
F-Class Insulation (155°C): Temperature rise ≤70°C at full load
Dielectric Withstand: AC 3000V / 1 min (primary to secondary)
Connection Groups: Δ/Y (recommended), D/d, D/y, Y/y, Y/d, Y/yn
Overload Capability: 1.2× rated load
Design Life: 20 years, continuous duty
Customisable Input: ≤600V
Robust Enclosure: IP20 powder-coated steel with castor wheels
| Item | Specification |
|---|---|
| Model | SGG-40KVA |
| Rated Capacity | 40 kVA |
| Phases | 3-Phase |
| Frequency | 50Hz / 60Hz |
| Connection Group | Δ/Y (recommended); D/d; D/y; Y/y; Y/d; Y/yn |
| Insulation Class | Class F (155°C) |
| Design Life | 20 years |
| Standard | GB 19212.14-2012 / EN 61558-2-4 |
| Input Voltage | AC 380–415V (customisable ≤600V) |
| Input THD Tolerance | THD ≤5% |
| Transient Peak Voltage | U P-P ≤2000V |
| Output Voltage | AC 200V / 220V (customisable ≤600V) |
| Waveform Distortion | None — pure sine wave |
| Voltage Regulation | ≤1s for input step ≤10V |
| Common-Mode Noise Attenuation | >60 dB (with electrostatic shield) |
| Efficiency (Isolation) | ≥95% |
| Overload Capacity | 1.2× rated load |
| Temperature Rise | ≤70°C (full load, summer ambient) |
| Noise Level | ≤45 dB @ 1m |
| Withstand Voltage | AC 3000V / 1 min (primary-secondary, primary-core, secondary-core) |
| Insulation Resistance | ≥100 MΩ |
| Protection Degree | IP20 (enclosed) / IP00 (bare) |
| Operating Temperature | −10°C to +40°C |
| Storage Temperature | −20°C to +60°C |
| Operating Humidity | 30–90%, non-condensing |
| Altitude | <1000m |
| Cooling | Dry air cooling (natural convection + forced ventilation) |
| Dimensions (Bare) | 480×380×420 mm (L×W×H) |
| Weight (Bare) | 160 kg |
| Dimensions (With Chassis) | 700×500×650 mm (L×W×H) |
| Weight (With Chassis) | 200 kg |
| Enclosure Material | Powder-coated steel |
| Mobility | Swivel castors with locking brakes (chassis model) |
An isolation transformer transfers AC energy from primary to secondary exclusively through electromagnetic induction — with no direct electrical connection. The electrostatic shield (Faraday shield) between windings diverts high-frequency common-mode noise and transient surges directly to ground, preventing them from coupling into the secondary circuit.
Select cables and lugs of appropriate cross-section. Maintain adequate clearance on all sides for heat dissipation and maintenance access. Proper grounding is critical — connect chassis ground (PE) and electrostatic shield drain wire to a reliable earth ground. For circuits with zero-sequence current or significant imbalance, neutral conductor cross-section should equal or approach phase conductors. Before wiring, verify no short circuit and insulation resistance ≥100MΩ.
WARNING: Never reverse input/output connections. Never swap phase and neutral. All wiring must be performed with power fully de-energised.
Indoor use, −5°C to +40°C. Relative humidity <93% (no condensation). Altitude <1000m. Supply voltage approximately sinusoidal (THD ≤5%), three-phase approximately symmetrical. Transient peak grid voltage U P-P ≤2000V. Store in dry, ventilated area, −20°C to +40°C, RH ≤80%.
Dry-type isolation transformers are virtually maintenance-free under normal conditions. In dusty environments, blow out dust from windings and terminals with compressed air (≤2 atm). Check fans, winding insulation for cracks or carbonisation, terminal tightness and grounding integrity (ground resistance ≤4Ω). Record all maintenance activities.
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Contact us today for a quote or technical datasheet.
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Website: www.feixiangdapower.com
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