Read The Difference Between DTU, FTU, TTU, and RTU In One Article

The distribution network automation system is generally composed of the following levels: distribution main station, distribution substation (permanently located in the substation, optional), distribution remote terminals (FTU, DTU, TTU, etc.), and communication network. The main power distribution station is located in the urban dispatch center, and the distribution substation is deployed in the 110kV/35kV substation. The sub-station is responsible for communicating with power terminal equipment such as DTU/TTU/FTU in the area under its jurisdiction, and the main station is responsible for communicating with each sub-station.

1、Data Transfer unit (DTU)

DTU is generally installed in conventional switch stations (stations), outdoor small switch stations, ring network cabinets, small substations, box-type substations, etc., to complete the position signal, voltage, current, active power, reactive power of switchgear, Power factor, electric energy and other data collection and calculation. The switch is opened and closed to realize the fault identification and isolation of the feeder switch and the restoration of power supply to the non-fault zone. Some DTUs also have the functions of protection and automatic input of backup power.

DTU Features：

1) The chassis structure adopts a standard 4U half (full) chassis with enhanced design.

2) The rear plug-in wiring method is adopted, the overall panel, and the fully enclosed design.

3) Take the lead in adopting the intelligent plug-in scheme based on CANBUS bus, which greatly reduces the wiring between plug-ins, completely avoids the hidden danger of poor plug-in contact, and has high reliability of device operation.

4) The adoption of the intelligent plug-in solution standardizes the chassis motherboard, which is convenient for production and on-site maintenance.

5) Different types of plug-ins of the device are guaranteed not to be inserted into each other during the structural design to improve the overall safety.

6) Using 32-bit D floating-point SP, the system performance is advanced.

7) Adopt a 16-bit A/D conversion chip with high sampling precision.

8) Using large-scale programmable logic chips, reducing peripheral circuits and improving reliability.

9) The large-capacity memory design makes the message and accident recorder meet the on-site requirements.

10) Using multi-layer printed board circuit and SMT surface mount technology, the device has strong anti-interference performance.

11) The measurement loop accuracy software is automatically calibrated, free of debugging, and reduces maintenance time such as on-site regular inspection.

12) Super strong electromagnetic compatibility ability can adapt to harsh working environment.

13) Powerful PC support tool, with perfect and flexible analysis software, which is convenient for accident analysis.

14) The combination of a simple and reliable protection processing system (DSP) and a mature real-time multi-task operating system not only ensures functional reliability but also meets the real-time nature of network communication and human-machine interface.

15) Support RS232/RS485, Ethernet, and other communication interfaces, the built-in Ethernet makes engineering applications simple and reliable.

16) Support IEC60870-5-101, IEC60870-5-103, IEC60870-5-104 and other standard protocols.

17) Independent power-down hold clock system and GPS time-synchronization system with time-synchronization pulse for each device.