Overload protection circuit for high-voltage motors

As overload protection, one-phase-one-relay wiring can be used. However, if the motor is equipped with current quick-break protection,
the inductive element of the GL-type relay, which is the current quick-break protection, can be used to achieve overload
protection.
    The operating current k (ol) of the over-negative protection is
set according to the rated current of the motor. The setting calculation formula is
    Iw (ol) =Kli×K,,×J. /KK
K in the formula - the reliability coefficient of the protection device, for the GL relay it is taken as 1_3}
    K, - the return coefficient of the relay, which is generally 0.8.
    The action time of overload protection should be greater than the time required for starting the motor,
which is generally 10-16 seconds. For motors that are difficult to start , they can
be adjusted according to the starting time that evades actual measurement .