Power monitoring software in intelligent power distribution system applications - News - Global IC Trade Starts Here 工业

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0 Preface

At present, many domestic building power distributions still use dry-type transformers with low-voltage cable distribution boxes to achieve distributed power supply, which brings a lot of inconvenience to the operation and management of the whole system. Computer technology and network communication technology are becoming more and more mature. The intelligent and networked functions of power distribution system measurement and control are an inevitable trend of development. Various problems in the operation of power distribution system can be fully solved by microcomputer.

The intelligent power distribution system is equipped with intelligent components with communication functions, and is connected with the computer system network through digital communication to realize automatic management of the operation of the switching devices in the distributed low-voltage cable distribution box. The system can realize real-time data collection, digital communication, remote operation and program control, and equipment maintenance information management.

1 Project Overview

Shanghai Nuclear Engineering Research and Design Institute is a key research and design unit affiliated to China National Nuclear Corporation. The new building system is divided into power distribution room and floor. The high voltage part of the power distribution room uses ACR330ELH to collect harmonic data, and WHD72 collects temperature and humidity. Data; low voltage incoming line side uses ACR320ELH to collect harmonics, power factor and other data, ACR220EK network power meter collects measurement current, switch state is connected to the DI (digital input) interface of ACR220EK instrument by auxiliary contact. The floor part is collected by the ACR220E for energy data. All electrical parameter data is transmitted to the host computer via the RS-485 bus through the communication interface of the instrument to realize telemetry, remote control and remote signaling functions.

2 system topology

The topology structure of the Shanghai Nuclear Power Institute power monitoring system is shown in Figure 1. The system adopts a distributed structure, which is divided by function or area and modularized. The whole system is generally divided into three layers, namely the field layer, the middle layer, and the main control layer.

The main task of the field level is to collect and measure the operating parameters of various power distribution systems on site, and transmit various data collected and measured to the monitoring system. Its main equipments are: ACR330ELH, ACR320ELH harmonic meter, WHD72D temperature and humidity meter, ACR220EK network power meter, installed in the cable distribution box on site. The above-mentioned devices all independently perform their respective functions, independent of the operation of the main control computer, all instruments have RS-485 communication interface, and the various electrical parameters and status signals detected by the on-site RS-485 bus are transmitted to the middle layer in real time. Data processing unit.

The middle layer is located between the field layer and the main control layer, and is composed of an optical isolator and a serial port server. The field 485 bus is connected to the switch through the serial port server of the optical isolator to complete the network communication connection and data between the field layer device and the main control computer. exchange.

The main control layer is located in the central control room or duty room, equipped with high-performance, high-reliability industrial-grade computers, UPS uninterruptible power supplies, printers, alarm devices, and so on. The Acrel-3000 power monitoring software is installed on the main control computer to realize real-time monitoring of the entire power distribution system through the software's man-machine interface and various management functions.

Figure 1 System topology diagram

The new floor monitoring center of Shanghai Nuclear Engineering Institute is located in the first floor control room. The power distribution room is located in the underground 2 storey garage. The distance is no more than 1200 meters. It can be directly communicated by laying RS-485 bus. Considering the location and convenient route Reasonable and other problems, the 8-way RS-485 network can cover all the distribution room monitoring points; the floor part takes into account the convenience of the wiring, and adopts the 3-way RS-485 network to pull the control room through the shaft and the ceiling.