{ "id": 61, "title": "SG Three-phase to Single-phase Transformers", "family": "Specialty & Test Transformers", "description": "Dry-type conversion transformers for dedicated single-phase industrial loads and supply balancing.", "sections": [ { "heading": "Overview and connection descriptions", "paragraphs": [ "The brochure first calls this a Scott transformer converting a three-phase input into two single-phase outputs. It states that the two single-phase loads must have equal capacity or three-phase current imbalance results. Applications are specific loads in industrial and mining enterprises, at 50/60Hz. This passage states class F heat-resistant insulation, cold-rolled grain-oriented silicon-steel laminations, and cylindrical, oval or rectangular windings.", "A following passage describes a special T-connected transformer converting three-phase AC into single-phase AC for large single-phase loads, improving network balance. It particularly identifies line-frequency melting supplies, with no balancing capacitors or reactors required.", "A further passage describes three-phase input and one single-phase output, nearly balanced input phase currents and no frequency distortion. Other technical and service requirements are described as similar to ordinary dry-type transformers, with cost above an isolation transformer. It states AC50/60Hz, working voltage below 1140V, insulation heat classes F, B and H, and manufacture to JB/T8750-1998 as a brochure claim." ] }, { "heading": "Construction and enclosure features", "paragraphs": [ "Cold-rolled silicon-steel laminations, varnish impregnation and oven drying are described as reducing vibration and noise. High-temperature insulating materials and winding ventilation ducts are intended to reduce coil temperature.", "Enclosed products are described as having casters below 100KVA, voltmeter, ammeter, cooling fan and temperature controller. Fans start above transformer temperature 80°. An overtemperature alarm is described as operating above 150° inside the transformer, provided on products above 100KVA." ] } ], "specifications": [ [ "Output voltage accuracy", "±1%" ], [ "Voltage regulation", "≤1.5%" ], [ "Output waveform distortion", "No waveform distortion" ], [ "Insulation options, technical table", "F, H, HC (standard F)" ], [ "Operating efficiency", "≥98%" ], [ "Frequency", "50/60Hz" ], [ "Overload capability", "1.2 times rated load for 4 hours; long-term full-load operation" ], [ "Noise", "≤35dB" ], [ "Temperature rise", "≤60°C" ], [ "Insulation resistance", "≥150MΩ" ], [ "Dielectric strength", "2500VAC/1min" ], [ "Cooling", "Dry-type air cooling" ], [ "Ambient temperature", "−25–+45°C" ], [ "Humidity", "≤90%" ], [ "Altitude and atmosphere", "≤5000m; no corrosive gases or conductive dust" ] ], "models": [ { "designation": "SG-5", "values": [ "5", "3Φ380V or other", "2Φ220V or other", "D/Y", "320", "210", "290", "200", "110", "10×20" ] }, { "designation": "SG-6", "values": [ "6", "3Φ380V or other", "2Φ220V or other", "D/Y", "340", "240", "320", "230", "130", "10×20" ] }, { "designation": "SG-10", "values": [ "10", "3Φ380V or other", "2Φ220V or other", "D/Y", "360", "280", "300", "250", "170", "10×20" ] }, { "designation": "SG-15", "values": [ "15", "3Φ380V or other", "2Φ220V or other", "D/Y", "460", "320", "340", "380", "166", "10×20" ] }, { "designation": "SG-20", "values": [ "20", "3Φ380V or other", "2Φ220V or other", "D/Y", "460", "340", "400", "380", "155", "10×20" ] }, { "designation": "SG-25", "values": [ "25", "3Φ380V or other", "2Φ220V or other", "D/Y", "410", "230", "380", "380", "180", "10×20" ] }, { "designation": "SG-30", "values": [ "30", "3Φ380V or other", "2Φ220V or other", "D/Y", "450", "360", "460", "380", "185", "12×20" ] }, { "designation": "SG-60", "values": [ "60", "3Φ380V or other", "2Φ220V or other", "D/Y", "540", "360", "520", "380", "180", "12×20" ] }, { "designation": "SG-80", "values": [ "80", "3Φ380V or other", "2Φ220V or other", "D/Y", "600", "400", "630", "440", "230", "12×20" ] }, { "designation": "SG-100", "values": [ "100", "3Φ380V or other", "2Φ220V or other", "D/Y", "600", "420", "630", "440", "240", "12×20" ] } ], "tables": [ { "caption": "SG overall and mounting dimensions", "columns": [ "Model", "Capacity (KVA)", "Input voltage", "Output voltage", "Connection group", "A (mm)", "B (mm)", "C (mm)", "D (mm)", "F (mm)", "G mounting slots (mm)" ], "rows": [ [ "SG-5", "5", "3Φ380V or other", "2Φ220V or other", "D/Y", "320", "210", "290", "200", "110", "10×20" ], [ "SG-6", "6", "3Φ380V or other", "2Φ220V or other", "D/Y", "340", "240", "320", "230", "130", "10×20" ], [ "SG-10", "10", "3Φ380V or other", "2Φ220V or other", "D/Y", "360", "280", "300", "250", "170", "10×20" ], [ "SG-15", "15", "3Φ380V or other", "2Φ220V or other", "D/Y", "460", "320", "340", "380", "166", "10×20" ], [ "SG-20", "20", "3Φ380V or other", "2Φ220V or other", "D/Y", "460", "340", "400", "380", "155", "10×20" ], [ "SG-25", "25", "3Φ380V or other", "2Φ220V or other", "D/Y", "410", "230", "380", "380", "180", "10×20" ], [ "SG-30", "30", "3Φ380V or other", "2Φ220V or other", "D/Y", "450", "360", "460", "380", "185", "12×20" ], [ "SG-60", "60", "3Φ380V or other", "2Φ220V or other", "D/Y", "540", "360", "520", "380", "180", "12×20" ], [ "SG-80", "80", "3Φ380V or other", "2Φ220V or other", "D/Y", "600", "400", "630", "440", "230", "12×20" ], [ "SG-100", "100", "3Φ380V or other", "2Φ220V or other", "D/Y", "600", "420", "630", "440", "240", "12×20" ] ] } ], "notes": [ "The source alternates between two single-phase outputs (Scott) and one single-phase output. Do not assume all SG models have an identical Scott connection; obtain the actual wiring diagram. The technical-table insulation options F/H/HC differ from prose F/B/H; both are retained. The output table uses 2Φ220V notation." ], "slug": "three-phase-to-single-phase-transformers", "category": "industrial-transformers", "categoryTitle": "Industrial Transformers", "relatedCategories": [], "image": "/catalog/products/three-phase-to-single-phase-transformers.webp", "href": "/products/series/three-phase-to-single-phase-transformers", "pdfPage": 31, "side": "left", "sheet": "/catalog/sheets/31-left.webp", "sheetWidth": 1006, "sheetHeight": 1375 }