Three phase Oil Immersed Grounding /Earthing Transformer Manufacturer 22kV 30kV 33kV 66kV

Its loss characteristics are highly related to operating characteristics: ① No-load loss refers to the iron loss (core hysteresis and eddy current loss) during normal operation. Due to long-term no-load/light load status, it is the main operating loss; ② Load loss refers to the copper loss (winding resistance loss) during faults, which is only generated during short-time faults and accounts for a very low proportion. The impact on operating costs needs to be divided by scenarios: For low-voltage and medium-voltage distribution networks (earthing transformers operate for a long time), the impact of no-load loss is obvious, and models with low no-load loss (such as national standard level 1 energy efficiency) should be preferred during selection; for high-voltage/extra-high voltage systems (earthing transformers work for a short time during faults), the proportion of no-load loss is small, and fault tolerance performance can be prioritized. Overall, its annual loss is much lower than that of ordinary power transformers, and the operating cost is relatively low

Extreme environments require targeted enhanced design, with specific measures as follows: ① High temperature environment (such as desert areas): For oil-immersed type, ONAF/OFAF forced cooling method is selected to improve heat dissipation capacity; for dry-type, high-temperature resistant insulation materials (temperature resistance grade ≥ F grade) are used, and heat dissipation air ducts are added; ② Low temperature environment (such as frigid areas): For oil-immersed type, low-freezing point insulation oil (freezing point ≤ -45℃) is selected, and oil heating devices are configured; for dry-type, thermal insulation casings are added to avoid winding condensation; ③ High altitude environment (altitude ＞ 1000m): Insulation strength attenuates with the increase of altitude, so the insulation margin needs to be improved (such as 20% improvement in insulation strength at an altitude of 2000m); for oil-immersed type, the oil level monitoring threshold needs to be adjusted to adapt to pressure changes; the cooling system needs to optimize the fan speed to compensate for the decrease in air heat dissipation efficiency.