Question: Short-term overload issue with transformers! Urgent
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The question is: The transformer capacity is 1250 kVA (10–6 kV). The electrical equipment in use is a screw compressor with a power rating of 500 kW and operating at 6 kV; it is equipped with a high-voltage soft starter, and the starting current is four times the normal current. Is there any problem with the transformer being overloaded for a short period during startup? Thank you!
Generally speaking, with your configuration, the startup time won’t be too long. Because your soft start is set to 4 times, which is higher than the common setting. Of course, motor start-up analysis still needs to be done.
Your transformer capacity is 2 times that of the motor’s capacity. 5 times, and with soft starting under high voltage, there is no problem in starting this high-voltage motor. You are worried about the overload issue of transformers; here’s the situation: the overload capacity for ordinary distribution transformers is 1. 5 times; for rectifier transformers, an overload factor of 2 is usually considered!
The transformer has a very high overload capacity; it can handle a 1.5-fold overload and continue to operate for at least half an hour. There is no problem with your motor starting.