LY-D612 distribution automation terminal interval unit is a component of distributed DTU, which meets the requirements of the technical specifications of the national grid primary and secondary integrated ring cage. It is applicable to 10kV distribution automation system. The distribution automation terminal is composed of several LY-D612 distribution automation terminal interval units and LY-D611 distribution automation terminal common units. Each unit of the distribution automation terminal adopts a small structure, which is conducive to decentralized installation in the ring network cabinet.

Characteristic

◇ The device adopts 32-bit high-performance ARM processor, which has fast operation processing, parallel data acquisition and data calculation processing, and 16 bit high-precision external A/D chip for AC sampling. It has strong communication management capability and provides multiple independent network channels. It supports RS-232, RS-485, Ethernet and other communication interfaces, as well as IEC60870-5-101/104, IEC61850-MMS, IEC61850-GOOSE and other communication protocols. It can realize real-time interactive communication between terminals, fast fault location of distribution grids, fast local fault isolation, fast transfer of power supply loads, and fast self-healing power supply in non fault areas.

◇ It has perfect local FA logic function, which can realize the functions of fault monitoring, location, isolation and power transmission restoration in non fault areas. Support quick action and slow action distributed feeder automatic protection function based on peer-to-peer communication; Support voltage time type and voltage current type feeder automatic protection functions independent of communication; It has optical fiber longitudinal differential protection function.

◇ The device integrates control, monitoring, signal, communication, measurement, event recording, protection and other feeder automation functions.

◇ The device adopts high-precision clock chip inside, and has the function of receiving SNTP network timing from the distribution master station.

◇ The device has the function of fault recording and fault wave recording, supporting 64 groups of wave recording data to be stored circularly, sampling at 80 points per week, and recording 4 cycles before and 8 cycles after the fault; Wave recording files can be uploaded to the public unit through the network interface.

◇ The device has self diagnosis and self recovery functions. It can self diagnose various functional boards and important chips, report abnormal information, and automatically reset software abnormalities.

◇ The device has the local and remote configuration function of unit operation parameters, including zero threshold (zero drift), change threshold (dead zone), heavy overload alarm limit, short circuit and ground fault action parameters.

◇ The device has the function of local and remote access to the inherent parameters of the unit. The access parameters include terminal type and factory model, terminal ID number, embedded system name and version number, hardware version number, software verification code, communication parameters, secondary transformation ratio, etc.

◇ The device has the function of cyclic storage of historical data. The saved data will not be lost after power loss. It supports remote reading. The historical data includes remote signaling displacement with time scale, remote control operation records, daily frozen electricity, fixed point data, extreme value data, etc.