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GE TSVG620B

Product Name:​ TSVG Series Dry-Type Power Transformer
Product Introduction:​ The GE TSVG620B is a 620 kVA three-phase epoxy-cast dry-type transformer in the TSVG product family. It is intended for indoor power distribution applications in commercial buildings, data centres, hospitals, and industrial facilities. The designation “TSVG” identifies the dry-type transformer series; “620” denotes the 620 kVA rating; “B” denotes a specific configuration variant.
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Detailed content

Technical Specifications:
  • Rated capacity: 620 kVA
  • Voltage ratio: 13.8 kV / 480 V (typical, customisable)
  • Phases: Three-phase
  • Vector group: Dyn11 (typical)
  • Insulation class: Class F (155 °C)
  • Cooling method: AN (natural air cooling)
  • Frequency: 50 Hz / 60 Hz
  • Short-circuit impedance: 6% (typical)
  • No-load loss: ~1.2 kW (typical)
  • Load loss: ~7.5 kW (typical)
  • Noise level: ≤ 55 dB(A) at 1 m (AN cooling)
Functional Features:
  • Epoxy vacuum casting: Windings are manufactured using H-class insulation material with VPI (vacuum pressure impregnation) process, delivering high mechanical strength and excellent moisture resistance.
  • Flame-retardant design: Insulation uses self-extinguishing Nomex/epoxy systems compliant with UL 94 V-0, oil-free and pollution-free.
  • Temperature monitoring: Pre-embedded PT100/PT1000 temperature sensors support connection to dry-type transformer temperature controllers.
  • IP protection: IP20 as standard; IP21/IP23 enclosures available as options.
Material Composition:
  • Core: High-permeability, low-loss cold-rolled grain-oriented silicon steel (CRGO), stacked with 45° fully mitred joints
  • Windings: Copper conductors (Cu) with H-class epoxy vacuum casting insulation
  • Insulation parts: Nomex aramid paper, epoxy glass cloth
  • Enclosure: Powder-coated steel plate (stainless steel enclosure optional)
Structural Features:
  • Core and windings form independent modules for ease of transport and installation
  • Low-voltage side configurable for top or bottom cable exit
  • Lifting eyes provided; bolt-down or concrete-foundation mounting via base holes
Working Principle:​ Based on electromagnetic induction — AC current in the primary (high-voltage) winding produces alternating magnetic flux, which is coupled through the core to the secondary (low-voltage) winding, inducing a voltage and thereby performing voltage transformation. The dry-type transformer uses air as the cooling medium; heat is dissipated via natural convection or forced-air cooling.
Application Scenarios:​ Commercial buildings, data centres, hospitals, schools, airports, industrial plants, metro and rail transit systems.
Installation Requirements:
  • Install in a well-ventilated indoor transformer room; ambient temperature ≤ 40 °C
  • Maintain a maintenance aisle of ≥ 0.8 m around the transformer
  • Foundation shall be level; deviation ≤ 2 mm/m
  • Core, enclosure, and neutral point must be reliably grounded; grounding resistance ≤ 4 Ω
Usage Precautions:
  • Monitor winding temperature during operation; maximum permissible temperature for Class F insulated windings is 155 °C
  • Avoid prolonged overloading; load factor recommended below 80%
  • Clean dust from the transformer surface regularly to maintain clear ventilation paths
  • Perform insulation resistance testing at least once per year using a 2500 V megohmmeter

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