Earthing up to 2 MVA – 33 kV – Earthing transformers are used to create a neutral point in a three-phase system, which provides possibility for neutral earthing. The earthing can be through an arc-suppression reactor, a neutral earthing reactor or resistor or directly in these earth transformers. Earthing transformers are usually oil immersed and may be installed outdoor. In cases where a separate reactor is connected between the earth transformer neutral and earth, the reactor and the transformer can be incorporated in the same tank.
Neutral earthing transformers are normally provided in 3-phase system, which is without neutral and earth fault protection.
ONAN /ONAF cooling . The range includes up to 33 KV systems and as per the site requirements.
• Meets or exceeds current IEC, WAPDA, K-Electric or any other standards required by customer
• 50 Hz operation
• Mild Steel (MS) (sealed type) tank (optional corrugated tank) with welded lifting lugs, support angles and base channels for pole mounting
• Mild steel MS Undercarriage with roller wheels (above 100KVA)
• Oil level gauge
• Oil filling plug
• Powder coating on state of the art automatic plant provides superior corrosion protection and is aesthetically pleasing to the eye
• Top cover mounted porcelain bushings
• Tin plated brass terminals for connection to copper/aluminium conductors
• Tank ground provision through earthing terminal
• Insulated cover for wildlife protection
• Engraved nameplate (rating and diagram)
• Insulating oil as per IEC60296 standard
• KVA rating on transformer
• Protection from lightning through arcing horns (outdoor transformer)
All transformers are tested in strict accordance with WAPDA P10 standard following from IEC with test reports available by serial number
• Leak test
• Polarity and Phase relation
• Resistance
• Power frequency test
• Megger test