In theory, as long as the impact on the power grid is within the acceptable range, the hydraulic oil pump motor can be directly started, but in practical applications, due to the large number of electrical equipment and the length of the line, the direct start is not necessarily feasible. The editor of Dalan Motor will discuss and discuss with you on this topic today.
According to the habit, motors with a low voltage of less than 11KW can be started directly, 11-75KW can be started with a star-delta or auto-coupled buck, and motors above 75KW are recommended to use soft start or inverter start. Of course, this is just a habit, not a rule, or as mentioned above, as long as the impact on the power grid is within an acceptable range, it can also be directly started.
However, it should be said that the specifications are well documented; the full voltage start of the motor: no more than 30% of the transformer capacity. It can be found in the middle of page 661 of the third edition of the Industrial and Civil Distribution Design Manual.
Based on the above, the judgment condition of the full-voltage start of the cage motor in the low-voltage power distribution design can be simplified as: the voltage of the distribution bus when the motor starts is not lower than 85% of the nominal voltage of the system. Generally, as long as the rated power of the motor does not exceed 30% of the rated capacity of the power transformer, it can be started at full voltage. Only when the estimation result is on the edge, detailed calculation is needed.
In short, what kind of starting method the motor uses is related to many factors. It is a proposition that is determined according to the actual situation. It must be discussed by people, adapted to local conditions, regulations are dead, and there are many methods for flexible application.
----- Responsible Editor: Dalan Oil Pump Motor 02-Procurement Consultant
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