The hottest point to multipoint, long-distance, hi

2022-08-20
  • Detail

Point to multipoint/long distance/large capacity/high speed/real-time data acquisition and control system

I. Introduction

using wireless radio to realize remote data acquisition, monitoring and control has the advantages of low cost, fast construction, reliable operation and simple maintenance compared with erecting special cables (or optical cables), renting special telecommunication lines, etc

scada series digital radio adopts digital signal processing, error correction coding, software radio, digital modulation and demodulation, surface mount integrated design and other technologies, which has the characteristics of high performance, high reliability and strong anti-interference ability. The radio provides a standard RS232 data port, which can be directly connected with computers, RTUs, PLCs, GPS receivers, digital cameras, data terminals, etc., with a transmission rate of 19200bps, The error code is lower than 10e-6 (when the receiving level is -110dbm), and the transmission power is 0 The watt can be adjusted, and any type of radio can be set as a master station or a remote station. The communication distance without transfer is more than 50 kilometers, which can adapt to the harsh indoor or outdoor working environment. The radio is compatible with data and voice. It can work in simplex, half duplex, time division duplex TDD, full duplex mode, send and receive the same frequency or different frequency transfer group, and has remote diagnosis, testing, and supervision functions to meet the data acquisition and control between the dispatching or control center of various industries and many remote stations

II. System structure

the structure of data acquisition and control systems for oil field/natural gas, water treatment, electric power, gas, railway, earthquake/meteorology/environmental protection, GPS, finance, public security/transportation/security, chemical industry, industrial control automation, etc. is as follows:

point to multipoint wireless data acquisition and monitoring system

point to multipoint wireless data acquisition and monitoring system (with remote relay)

III Typical examples

1. SCADA/distribution automation/remote meter reading/power load management of power agriculture (1) the central station of the universal material testing machine system

is located in the dispatching building of the power supply bureau, and the RS232 data port of the radio is directly connected with the communication front-end machine of the dispatching automation system; The external station is the substation, switchgear and transformer of the Bureau, and the radio station is connected to rtu/ftu. The system adopts wheel fatigue testing machine, which can apply inquiry or CDT working mode in the laboratory, and the transmission rate is 19200bps. The central station radio station can be equipped with dual hot standby automatic switching

Long Island Power Company automatic recovery system

due to its small size, solid structure, reliable operation, wide working environment temperature range (-30 ~ + 600C), MDS radio can work outdoors. Therefore, it is very suitable for distribution automation data communication network and has been widely used in distribution. More than 900 sets of MDS 9310 spread spectrum data transmission stations are used in the long island distribution automation project in New York, USA. 400 sets of MDS 4310 data transmission radio stations are used in the distribution automation project of Hong Kong China power company. More than 40000 sets of MDS data transmission stations have been installed and used in the U.S. power industry, and their operation is stable and reliable. Domestic Dalian Electric Power Bureau, Jiangsu Yancheng Electric Power Bureau and Shandong Weifang electric power bureau all adopt MDS data transmission radio

wireless electric distribution management

2. Tap water/water saving in dry areas/sewage treatment control/wireless data communication for basin water regime measurement and reporting

this is a monitoring and data acquisition system. The central station is set in the company's Dispatching Center, and the main station radio is connected with the front-end computer through RS-232 data port, and then connected to the company's local server; The external stations are respectively set in the water production plant, water treatment plant and water supply pipe monitoring points. The radio is directly connected with the acquisition terminal, which can monitor and collect various data such as water level, pressure, flow, turbidity, residual chlorine, pump frequency, etc. for the company's dispatching center and relevant departments to analyze and make decisions, which improves work efficiency and ensures the quality of water supply. In some stations, radio stations are directly hung on towers and operated outdoors to reduce construction funds. Dozens of water plants such as Beijing Shijingshan Yangzhuang water plant and Jiangsu Changshu water plant have used MDS data transmission radio

wireless water/wastewater management

3. Oil field/natural gas/pipeline gas SCADA system

mds radio is used for oil field monitoring and control and data acquisition system. Its system central station is located in the oil field data acquisition and control center, and each external station is located in oil wells, oil storage stations, oil pipeline monitoring points, etc; It can monitor and collect oil pressure, flow, consistency, temperature, liquid level and other parameters, and control the start and stop of oil production machine. Nearly a thousand MDS data transmission radios are used in the SCADA system of Tarim Oilfield, Cainan Oilfield, Turpan Hami oilfield and Shengli beach oilfield in Xinjiang. These systems have been running for many years, and their performance is stable and reliable. At present, there are more than 60000 MDS radios used in oil and gas fields in the United States, which is the preferred equipment for oil field SCADA system. Compared with 2017, MDS radio stations have been installed in 60 oil wells in Lea oil field in New Mexico

oil field/natural gas data acquisition and monitoring system

4. Automatic control of railway/industrial and mining enterprises

MDS radio is used to realize real-time monitoring of the production process of railway, industrial and mining, large enterprises, etc. instead of twisted pair cable, it has the advantages of easy installation and erection, convenient relocation and removal, etc

automatic train information acquisition system

5. Urban street lamp monitoring/meteorological/environmental protection data three remote system

mds radio is used for remote data acquisition and control of urban street lamp monitoring, meteorological, environmental protection and other departments. It has the characteristics of high speed and reliability. It replaces DDN line and saves money

urban lighting traffic engineering control system

IV. equipment configuration and reference price

the equipment configuration and reference price required by the system scheme are as follows:

1. Simple master station (MDS radio, switching power supply, antenna feeder, connecting line, lightning arrester) 9500/Set

2. substation (MDS radio, switching power supply, antenna feeder, connecting line, lightning arrester) 8500/Set of

options:

a. hot standby master station

(MDS radio X2, 25W power amplifier, hot switching between main and standby, power supply, antenna feeder, lightning arrester, connecting line) 27500/Set

B. full duplex master station

(MDS radio X2, 25W power amplifier, duplexer, power supply, antenna feeder, lightning arrester, connecting line) 25000/Set

c. transfer station

(MDS radio X2, 25W power amplifier, duplexer, power supply, antenna feeder, lightning arrester, connecting line) 25000/Set of

d. high gain omnidirectional antenna (Guangzhou Institute of communications, 9dB, for the main station of long-distance communication over 20 kilometers) 550/Sub

e, medium gain omni-directional antenna (Guangzhou Institute of communications, 6dB, for the main station of long-distance communication over 20 kilometers) 480/Sub

f, high gain setting

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