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The operation resulting from an open motor power line or a motor
that was originally Relays PDF supposed Relays Manual to operate with three-phase voltage, but
is currently operating with single-phase voltage because Relays PDF of loose
connections, faulty control Relays Manual switch connection, or an open wire in Relays Relays PDF the
motor is called open-phase operation.
If the motor starts up under open-phase conditions, startup current
will be supplied indefinitely because a stopped inductive motor will
not start with a single-phase voltage. Therefore the overload element
described earlier can be used to detect this condition and prevent the
motor from burning up. Should an open-phase condition occur during
normal operation and result in single-phase operation, however, the
three-phase inductive motor will continue to operate as a single-
phase inductive motor if the load is light enough. Refer to Fig. 3. The
three possible conditions are a power-supply open phase in a star-
connected motor, a power-supply open phase in a delta-connected
motor, and an internal delta open phase. Let's see whether we can
prevent the motor from burning up here simply by inserting an
overload element in the power supply line.
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