Protection functions: three-stage overcurrent protection, three-stage reclosing, post-acceleration, directional zero sequence protection, in-situ feeder automation-voltage time scheme, in-place feeder automation-voltage and current scheme.

Signaling acquisition: the ability to collect three-phase current, zero-sequence current, and zero-sequence voltage, 8-channel incoming acquisition, 8-channel analog acquisition, including 4-channel voltage signal, 4-channel current signal, distribution line loss acquisition, including four-quadrant power, and support bidirectional metering.

Communication function: GPRS/3G and 4G full Netcom and dual 4G communication, Ethernet communication, optical fiber communication.

Fault location and recording function: Optimize the discrimination function of the original neutral point ungrounded system and the single-phase grounding fault selection of the small electric yang grounding system, and improve the function of fault recording and uploading to the master station and 64 storage.

Based on the high-precision sampling of the sensor and the high fidelity of the analog signal-amount waveform, the control unit adds the meter-level distribution line loss acquisition function on the basis of the traditional FTU, and optimizes the identification and positioning function of the low-current grounding fault. And the sampling frequency is increased, so that the waveform of the fault recording is closer to the real waveform.

Distribution line loss acquisition function: through the high-precision sampling characteristics of the analog signal by the sensor, the electrical energy data on the real-time metering line includes forward and reverse active power and four-quadrant reactive power to realize the function of two-way metering, and support communication transmission.

Identification and positioning function of small current grounding fault: relying on the unsaturated characteristics of the analog signal at high frequency resonance by the electronic transformer, the position characteristic quantities of some small current grounding points can be retained, and the control unit discriminates these characteristic quantities through a variety of algorithms, so as to accurately locate the area where the fault occurs.

Fault recording function: through the sampling of 128 points of the weekly wave, and the complete recording of the waveform of each channel and the switch position of the first 4 cycles and the 8 cycles after the fault, the remote signaling information is sent to the master station for analysis of the cause of the fault. It also supports the cyclic storage of 64 fault recordings.