There are six normal operation modes of serial power grid connection and each operation mode has different remote backup power automatic throw-in（BPAT） logic requirement. At present， BPAT device is effective only in the case of one operation mode or one terminal being backup， which results in many limitations. A novel remote BPAT device has been developed with basic principle of BPAT. Its logic realization relies mainly on local information supplemented by necessary remote information. In the meantime， all the remote information is combined and converted into several switch information， which is transferred with relays communication interface device. The experiments and operation results in two 110 kV substations prove that the device can adapt to different logic requirements of different operating modes with serial power grid connection.