BP400 ACR controller is a new generation of digital relaying control terminal produced by BAIYUE electric Co., Ltd. It can protect, control, measure and monitor the grid with voltage below 35kV. It is suitable for a variety of system operating modes, including isolated neutral system, resistance-grounded system and arc suppression coils grounding system.

BP400 series device collect full power value and isolate the measurement current circuit from the protection current circuit, which not only improve the reliability of protection but also ensures the measurement accuracy. High-precision measurement function ensures the factor of voltage, current and power to grade 0.2, as well as the factor of grade 0.5 to four- quadrant power measuring and metering.

BP400 series supports function of GPS B code time setting. Two RS485 channels support for the double-net communication mode as well as the communication protocol of Modbus and IEC60870-5-103. It provides extremely reliable net communication for the users, for different protocols could be applied into different networks.