What Are The Parts Of Voltage Transformers (VT) Used In GIS?
VTs are inductive types with an iron core. The primary winding is supported on an insulating plastic film immersed in SF6.
The VT should have an electric field shield between the primary and secondary windings to prevent capacitive coupling of transient voltages.
The VT is usually a sealed unit with a gas barrier insulator. The VT is either easily removable so the GIS can be high voltage tested without damaging the VT, or the VT is provided with a disconnect switch or removable link
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