Ankerui Electric Co., Ltd., Jiading, Shanghai 201801, China;
Abstract: The AM5 series microcomputer is used to protect and collect various electrical parameters and switching signals from the 10KV high voltage cabinet in the power distribution room. The system adopts the on-site local networking mode. After the network is connected, it communicates through the fieldbus and travels to the background. The Acrel-2000 power monitoring system realizes the real-time monitoring and management of the power distribution circuit power distribution.
Key words: Yuehai Bay Central Business District; large public buildings; AM5 series microcomputer protection; Acrel-2000; power monitoring system;
0 overview
The comprehensive central hub of the Bay Central Business District is a large-scale public building project. It is located in the east of Wanshou Road, Yinchuan, Ningxia, south of Shenyang Road, north of Yinchuan City Civic Hall. The total area of ​​the project is 33,400 square meters. 10,000 square meters. The project has a 10KV high-voltage substation with two 10kV incoming loops and two 10KV outgoing loops. The 10kV substation comprehensive security adopts RS485 bus network to access the power monitoring system, and the system host is installed in the 10kV substation duty room.
1 needs analysis
In order to ensure the statistics and analysis of the electricity load for production management and real-time monitoring of dangerous sources. Real-time online monitoring of parameters such as voltage, current, power and various switching signals of the 10KV high-voltage power distribution cabinet on site is required. Once the monitoring point is abnormally monitored, the alarm can be detected in time, and the relevant personnel take necessary measures to avoid the occurrence of a safety accident. The automatic meter reading function saves manpower and material resources, and the current trend curve function can intuitively display the working status and time of each circuit.
data collection
Automatically collect analog data of all AM5 microcomputer protection on site, and automatically collect switch data such as field switch status and fault status.
Support real-time acquisition, automatic cycle acquisition (timed acquisition) configurable cycle (1 minute to 24 hours).
Support multi-thread processing mechanism, improve data collection efficiency, and can collect data for multiple devices at the same time.
The real-time data display adopts the visual display mode of the main wiring diagram of the power distribution room, and the circuit breakers are disconnected and the fault status is visually visible.
Data query and display
It is required to facilitate the inquiry of managers at all levels, and the query interface can adapt to the requirements of managers at all levels to support flexible conditional combination query.
The data display function can be divided into three levels: operation layer, management layer and decision layer according to the different permissions of different users.
authority management
It is required to assign different roles to different users, and can authorize function submenus, specific file records, data records, and the like.
The system requires a reasonable and complete user security control mechanism to effectively protect the information resources in the application environment and prevent information loss, theft and destruction.
error alarm
Fault judgment and alarm have automatic fault diagnosis and use sound and light mode alarm function. Alarm types include switch faults, voltage and current overruns, on-site microcomputer protection and monitoring system communication faults. The alarm time is automatically recorded in the system database, which is convenient for users to query. The staff can grasp the real-time running status of the central power distribution room at any time, find the fault of the power distribution and operate accordingly, improve the management efficiency of the power distribution and improve the safety of the power system. reliability.
2 system plan
The Acre-2000 system of Ankerui is based on the actual situation of the 10KV high-voltage substation in the comprehensive hub station project of the Bay Central Business District. The overall network structure uses shielded twisted pair cable to connect two microcomputers to the monitoring room directly. The host has its own serial port to ensure the stability and real-time performance of the power distribution monitoring system of the power distribution station. As shown below:
System structure diagram
There are a total of 7 AM5 series microcomputer protection devices in the field center power distribution room, which are divided into two RS485 buses and connected to the monitoring host of the monitoring room.
1) Station management
The management of the station control management system for the power monitoring system is a direct window for human-computer interaction. In the comprehensive hub station project of the Yuehai Central Business District, it mainly refers to the monitoring host placed in the monitoring room.
2) Network communication layer
The communication layer is mainly composed of a bus network. The main function of the bus network is to realize the data interaction between the on-site microcomputer protection and the station control management layer, so that the distribution system management is centralized, informationized and intelligent, which greatly improves the safety, reliability and stability of the power distribution system. Sexuality has truly achieved the goal of unattended.
3) Field device layer
The field device layer is a data acquisition terminal, which is mainly composed of a microcomputer protection device on a 10KV power distribution cabinet. The intelligent device is connected to the monitoring host through a shielded twisted pair RS485 interface and connected to the monitoring host for remote control.
Microcomputer protection device on-site connection
The on-site microcomputer protection device is connected by hand-shielded through the shielded twisted pair (RVSP2*1.0), and the number of microcomputer protection per bus is about 5. The specific connection diagram is as follows:
Communication line connection diagram
3 system function
The real-time monitoring system diagram is the main monitoring screen, which mainly monitors the running status of all loops of the 10KV high-voltage substation in real time. In the system diagram, you can visually see the operating parameters and status of each 10KV power distribution cabinet, such as: three-phase voltage, current, active power, reactive power, power factor, frequency, etc. As shown below:
One system diagram of 10KV high voltage substation
After logging in to the system as an administrator, you can click on the loop name in the system map to modify the loop name directly. After the modification, the system will automatically save it. In this interface, by clicking on a certain loop, the detailed remote signal of the loop will be jumped out, and the status of the circuit breaker and the like can be displayed in color.
10KV distribution cabinet remote signaling status
The event alarm recording function mainly completes the alarm information event record and the occurrence time during the query time period, provides the basis for the on-duty personnel and analyzes the cause of the accident; the content of the alarm information includes real-time remote real-time alarm, remote real-time alarm, and telemetry. The diachronic alarm and the long-distance alarm are used to monitor the telemetry and remote signal collected by the system. The alarm window opens automatically when the system is running and remains hidden in the background. As shown below:
Alarm function real-time query
The schematic diagram of the system communication structure mainly shows the networking structure of the system. The system adopts a layered distributed structure and monitors the communication status of the interval layer devices. Red indicates normal communication and green indicates communication is abnormal.
Communication structure diagram
4 Conclusion
In today's distribution facilities, the distribution security of large public buildings is crucial. The application of the Acrel-2000 power monitoring system in the 10KV high-voltage substation of the comprehensive hub project of the Gulf Central Business District can be applied. Real-time monitoring of the power supply to the distribution circuit for power distribution. The system realizes the analysis and processing of the collected data, and displays the running status of each 10KV power distribution cabinet circuit in the 10KV substation in real time. It has pop-up alarm dialog box and alarm sound prompt for the closing and closing of the load. The system is safe and reliable. Stable, ensuring the reliability of electricity consumption in large public buildings.
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