Three-phase power system remote protective device

The utility model relates to a three-phrase supply system distance protection device, in particular to a power supply device of three-phrase supply system failures such as lack-phrase and anti-phase and etc, by means of the instantaneous detection of the protective circuit and the indication of the alarm and the alarming lamp to automatically cut the failure and provides immediate warning, thus reducing the losses of the industry (such as the losses of livestock breeding caused by oxygen supply disruption), the utility model is characterized in that the instantaneous failure can be quickly resumed after the cause of the failure is eliminated so as to protect the power supply device and prevent the motor of the system from burning down.