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What are the necessary precautions for specifying Trihal dry type transformers on operation of height above 1000 m of altitude?

For Trihal cast resin transformers (dielectric Strength of applied Voltage Test): the voltage needs to be increased by 1% each 100 m above the 1000 m.
Also some correction needs to be applied by steps of 500 m above 1000m for temperature rise (current) according to transformer design.
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