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power module in automation DTU system of power distribution network

author：Hongrensource：Original Date：2025-02-11
In the power industry, RTU[1], DTU[2], FTU[3], TTU[4] and other devices are switch monitoring devices in the distribution network automation system, which are suitable for the automation engineering of urban, rural and enterprise distribution networks, and complete the automatic functions of monitoring, protection and communication of switches on the cabinet and column of the ring network. It is widely used in electric power industry to realize normal monitoring, fault identification, isolation and non-fault section restoration of power distribution line with electronic distribution station and main station. The internal design of these devices is very similar, and the requirements for power supply are even more so. The following uses DTU as an example to introduce its power supply solution.

DTU is generally installed in conventional open and close stations (stations), outdoor small open and close stations, ring network cabinets, small substations, box-type substations, etc., to complete the collection and calculation of the position signal, voltage, current, active power, reactive power, power factor, electrical energy and other data of the switching equipment, and to open and close the switch. The fault identification and isolation of feeder switch and the recovery of power supply to the non-fault region are realized. Some Dtus also have the function of protection and automatic input of backup power.

How the DTU system works

Distribution terminal DTU function can be flexibly combined through software configuration configuration, DTU function module real-time monitoring of high-voltage line voltage, line current, zero sequence current, equipment status and other operation and fault information, complete remote communication, telemetry, remote control functions, to achieve the distribution network automation real-time monitoring; Protection function to achieve line fault detection, excision function; The communication management module has a variety of communication interfaces and a variety of standard communication protocols. In addition to the internal data management function of the terminal, it can also forward the energy meter, PLC and DC screen data in the distribution room or the opening and closing station, and communicate with the main station system through a standard unified interface to complete data transmission and other functions. The distribution terminal adopts the distributed design mode, and the powerful software and hardware configuration function not only meets the real-time requirements of DTU, but also realizes the data storage and recording function, and can realize the independent configuration function of microcomputer protection of the line, which successfully solves the compatible coexistence problem of measurement and control, protection and communication, and achieves the purpose of simplifying the types of equipment in the site.

Category： Power application

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