1. Allowable temperature
Take dry-type transformer as an example, the allowable temperature should not exceed 110 degrees, and the maximum should not exceed 120 degrees. Other types of transformers can be specified according to specific instructions.
2. Allowable load
The transformer should generally not operate beyond the rated capacity, but normal overload operation is allowed. When overloaded, it should not exceed 10% of the transformer capacity, and attention should be paid to temperature rise.
3. Unbalanced load of three-phase transformer
When the three phases are unbalanced, the current of the largest phase should be monitored. If the three-phase current is seriously unbalanced, the average distribution of the load of the single-phase electrical equipment should be adjusted in time.
4. Allowable fluctuating voltage
The transformer power supply voltage should generally not exceed 5% of the rated value, that is, the 10KV line voltage should not exceed 10.5KV and should not be lower than 9.5KV.
