Distributed Station Terminal (DTU)
Product Description
The Distributed Station Terminal (DTU) is a core device for distribution network automation, adopting a decentralized architecture. It consists of bay units (installed inside switchgear) and a common unit (centralized management), which work together via a bus. It is mainly used in applications such as ring main units, switching stations, and distribution rooms on 10kV distribution lines.
The HXD320-DCU distribution automation common unit is responsible for collecting information from measurement and control units and communicating with the master station system to upload collected data.
The HXD320-CMU distribution automation bay unit performs measurement, protection, and control of switches, realizing distribution automation functions, and communicates with the HXD320-DCU management unit to upload collected data.
Product Advantages
Distributed Station Terminal (DTU)
Technical Specifications
| Parameter Name | Parameter | Remarks |
| Device Power Supply | DC48V | |
| Communication Power Supply | DC24V | |
| Digital Inputs | 7 digital inputs per bay. | |
| Analog Inputs | Measures ABC three-phase voltage of one bus section and one zero-sequence voltage; measures ABC three-phase current and zero-sequence current per bay. | |
| Output Circuits | Two remote control outputs (open/close) and two protection outputs (open/close) per bay. | |
| Communication Interfaces | 1 Bluetooth interface; 1 hot-swappable 4G/5G module interface; 3 RS485 communication interfaces; 1 serial debug interface; 1 hot-swappable wireless communication module interface; 2 100M Ethernet interfaces. | |
| Installation Method | Shielded vertical, cabinet dimensions: no larger than 1300*600*400mm (excluding communication box). | |
| Metering Function | Built-in line loss metering. | |
| Protection Functions | Three-stage overcurrent protection, two-stage zero-sequence current protection, short-circuit fault alarm, small current grounding line selection, three-shot auto-reclosing, non-interrupting current blocking, under-voltage alarm, zero-sequence overvoltage alarm, PT disconnection alarm, post-acceleration protection. | |
| Time Synchronization | GPS/Beidou time synchronization. | |
| DTU Connection Type | Rectangular aviation connector | 26 pins |
| Backup Power Supply | Rated voltage DC48V, single battery cell no less than 12Ah, service life ≥3 years, capable of completing "open-close-open" operation and maintaining operation of the distribution terminal and communication module for at least 4 hours. | Optional 20Ah, 24Ah, or other capacities based on user requirements. |
