The system hardware part adopts PROFIBUS field bus and Kinco-R1 remote I / O series module. Among them, 2 Kinco-B131 PC Adapter cards are used to realize the connection between the microcomputer and PROFIBUS; 2 Kinco-R131-08IV A / D converters have a total of 16 points to collect the analog signals in the field and convert them into digital quantities and transfer them to the microcomputer through the bus ; 8 Kinco-R121-08DX 8-channel DI digital input module with a total of 64 points, 15-channel DI digital input module with 37 blocks with a total of 555 points to complete the monitoring of system switching; 2 Kinco-B141 repeaters extend the bus distance; The 14 intelligent AC sampling modules have a total of 196 points and a total of 831 points.
The system software is configured by "King King" software, which runs on the full Chinese interface of the Microsoft Windows 95/98 / NT Chinese platform, adopts new technologies such as multi-line and COM components, and realizes real-time multi-tasking. The software runs Stable and reliable.
2. System structure
(1) The system structure is shown in the following figure: the two master stations are composed of two industrial control computer systems, which are installed in the central station and the south station house respectively.
Kinco-R1 series I / O modules are used as slave stations on the PROFIBUS field bus to perform field data collection and necessary control.
The master station and slave stations together form a multi-master multi-slave PROFIBUS system. The master station exchanges information with slave stations scattered in the basement of the central station, east annex, west annex, and south station within a predetermined period. Any master station can read the information from the slave station, so it is a redundant structure.
(2) Basic configuration of system hardware
A. Two mainframes, using high-end PC-compatible Pentium II microcomputer, main frequency 233MHZ, memory 64M, hard disk * G, two PC adapter cards, dual-machine hot backup mode operation.
B. Printer: One EPSONLQ1600K Chinese and English printer.
C. Monitor: high resolution color display SVGA card driver with a resolution of 1024 * 768, diagonal size of 21 inches.
D. Sampling module: Two Orient-2010 A / D converters are used to complete the collection of analog signals such as temperature and humidity.
E. AC sampling module: Kinco-R1 series power transmitter is used to sample three-phase voltage and three-phase current to complete the tour measurement of U, I, P, Q, power factor, and switch status of each substation. Continuous accumulation of reactive energy, event recording, signal alarm and other tasks.
F. Switching module: Kinco-R1 series 8-channel digital input module and Kinco-R1 series 15-channel digital input module are adopted to realize the collection of all on-site switching quantities.
G.UPS uninterruptible power supply, provide reliable power supply guarantee, to prevent the sudden breakpoint caused by the paralysis of the monitoring system and production loss.
3. The basic functions of the system
(1) Operation station function of power supply center
The operation station of the power supply center is the monitoring center of the entire low-voltage power supply system. It switches the status of the power distribution rooms of the central station, south station building, east annex, and west annex, temperature, humidity, illegal intrusion alarm, real-time curve, history Monitor the detailed conditions of the system such as curves and system reports.
(2) Field instrument
The field instrument provides a standard 4-20 mA industrial current signal, which is digitally converted by the Kinco-R1 remote I / O series module and sent to the host computer for monitoring via the PROFIBUS field bus.
(3) Fieldbus technology
The use of PROFIBUS fieldbus technology is a significant feature of the entire system. PROFIBUS fieldbus hardware has simple composition, practical network protocol, and strong anti-interference ability. It is one of the internationally recognized fieldbuses with the best performance.
4. Functions realized by the system
(1) Automatically monitor the switch status and real-time power values ​​of voltage, current, power, power factor, electrical energy, etc. of the low-voltage distribution system;
(2) Fault alarm, real-time tracking display, and the screen where the fault is automatically popped up;
(3) Electric energy billing;
(4) Detection and monitoring of transformer temperature over-temperature alarm;
(5) Indoor temperature and humidity detection and display in the power distribution room of the east and west annexes;
(6) The east and west annex buildings are unattended, fireproof, anti-theft, and illegal invasion;
(7) A central station is set in the central station and the south station building to form a redundant system;
(8) CRT picture level monitoring;
(9) The communication between the master station and the slave station adopts PROFIBUS field bus;
(10) The upgrade and expansion interfaces are reserved.
DC cable safety, high transmission efficiency, and convenient current regulation
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