Application of Acrel-3000 Prepaid Power Management System in the School of Tibetan Mastiff of Southwest University for Nationalities

Introducing the Tibetan Mastiff College of Southwest University for Nationalities, using intelligent power meters to collect various electrical parameters and switching signals from the power distribution site. The system adopts the on-site local networking mode. After networking, it communicates through the fieldbus and travels to the background. The Acrel-3000 prepaid power management system realizes the real-time monitoring and management of the power distribution circuit.
Yang Junjun

1 Ankerui Electric Co., Ltd., Jiading, Shanghai 201801, China;



0 Overview

The pre-paid projects of Southwest University for Nationalities mainly include 13 new student residences in the Minhang Airport Campus and 14 pre-paid electricity sales management systems for electric energy meters.

The project has two buildings, all of which are six floors. There are 532 rooms in total, of which 13 are 289 rooms in the academy, 243 rooms in 14 Tibetan colleges, and 195 single-phase multi-user electric energy meters are used in our company.

1 Demand analysis

Dormitory is the place where students learn and study, safety is the first priority! When students use electricity, it is inevitable that there are violations. It is completely inadequate to rely solely on propaganda and student consciousness, and it is very easy to generate electricity accidents. Electricity accidents in colleges and universities not only cause trouble to the school, but also cause harm to students. After the introduction of the safety intelligent prepaid power management system, fires and injuries caused by the use of electrical appliances will not occur again. The system can automatically, accurately and quickly identify the situation of overloaded power, illegal use of electricity, etc., and can start the circuit protection function in time, completely eliminating major safety hazards with modern intelligent means. Nowadays, the logistics management of student apartments has become socialized. The original management mode requires a lot of manpower support. The introduction of apartment-style safe electricity smart prepaid power management system will greatly reduce the logistics management workload. Saved human and financial resources for the school. For any unit or individual, funds play a role in blood. The recovery of funds affects the profit income of units and individuals, and also brings certain troubles to the financial work. Due to the use of the intelligent management system, its accuracy and timeliness are fair and reasonable, and it has established a good image of the logistics management department.

This technical condition applies to the dormitory building of the Tibetan Mastiff College of Southwest University for Nationalities. Supplier products should be highly safe and reliable, easy to expand, and easy to maintain and maintain. The products provided by the supplier shall meet at least the technical conditions.

1.1 Energy metering function and prepaid function

The system separately conducts energy metering and prepayment for each room's lighting/socket and air conditioner; pre-receives the student's electricity consumption fee, and after the student purchases electricity, the system will pre-purchase the pre-purchased power through the communication network to the meter. In the unit, the prepaid function is implemented.

1.2 No charge shutdown function

When the remaining power of the room loop is used up, the meter unit circuit will automatically shut down and automatically close after the recharge is completed.

1.3 air conditioning control function

The system can realize the power transmission control of the air conditioning circuit according to the requirements.

1.4 Load Management Function

The maximum load value of the room loop can be set within a certain range as needed, and the overload will automatically be cut off.

1.5 Power inquiry function

When the user recharges, he can query the corresponding current remaining power and the total power consumption.

1.6 Sales statistics and analysis functions

The system can print daily, monthly, and yearly statistical reports according to different time and needs of users.

2 system plan

According to the actual situation of the Southwest University of China, the Acre-3000 system uses the shielded twisted pair cable to connect directly to the data collector and then connects to the monitoring host of the duty room through the optical fiber to ensure the stability of the transmission of the power management monitoring system. With real time.

There are 195 ADF100s on the site, which are divided into 24 RS485 buses to connect to the communication management machine. The communication management machine is connected to the monitoring host through the optical fiber to the duty room to realize the data connection between the instrument on the bus and the monitoring host.

2.1) Station management

The management of the station control management system for the power monitoring system is a direct window for human-computer interaction.

2.2) Network communication layer

The communication layer is mainly composed of four ANET-LX8, Ethernet equipment, optical fiber and bus network. The main function of ANET-LX8 communication management machine is to monitor the on-site intelligent instrument; the main function of Ethernet equipment, optical fiber and bus network is to realize the data interaction between the substation and the main station, so that the distribution system management is centralized, informationized and intelligent. It greatly improves the safety, reliability and stability of the power distribution system, and truly achieves the goal of unattended operation.

2.3) Field device layer

The field device layer is a data acquisition terminal, which is mainly composed of smart meters. The smart meter is connected to the communication server through the shielded twisted pair RS485 interface, and adopts the MODBUS communication protocol bus type connection to reach the monitoring host through the communication server for networking and remote control.

System structure diagram



Smart meter field connection

The field instrument is connected by hand-shielded through the shielded twisted pair (RVSP2*1.0). The number of smart meters connected to each bus is about 20, and different types of smart devices are connected to different buses, and then the data is uploaded to the communication. The management machine ANET-LX8, and then upload the data to the local monitoring terminal. The specific connection diagram is as follows:



Construction guidance

According to the site plan, determine the location of the meter box and give the customer the construction drawings.



3 system function

Room management: Users can configure to modify room information, such as the electric energy table address, circuit number, etc., and can add and delete rooms, query room attributes, etc.



Room management

Room purchase: Under normal circumstances, after the student recharges through the card on the Internet, the prepaid sales system recharges to the corresponding meter loop according to the intermediate table updated by the card manufacturer. Therefore, there is no need to manually charge the recharge. The reason for retaining this function is that the manual recharge can be performed by the administrator (supporting the negative number) when the student has a recharge error.



Room purchase

Real-time monitoring: Real-time monitoring of the electricity usage of each student room. The refresh rate between individual tables is 800 milliseconds. In the case of normal communication, the current power consumption data of the student room is displayed as shown below:



real time monitoring

Automatic communication alarm: When the system detects that the communication between the system and the communication management machine or the communication management machine and the energy meter is abnormal, a warning alarm will be given.

System operation log, account operation log, recharge record, monitoring record: The system will record every step done by each operator in the database, and trace all of its operations.



Communication failure automatic alarm

Room sales inquiry: On the system, the operator can check the recharge information of a room.



Room sales inquiry

Real-time control commands: The system can read the power consumption of a single room, and here you can set the parameter information of the meter, such as: closed (disconnected) relay, alarm power, hoarding power setting, maximum current threshold, maximum power threshold setting , power is cleared, whether to open strong control, etc.



Remote control command

System data backup and restore: The operator can back up and restore the data of the system. When the server is shut down abnormally or the server is replaced, the data can be secured.



System data backup and restore

Statistical analysis function of electricity data: successful record of recharge, unrecorded successful record, system log, real-time monitoring data, etc. can realize statistical query, report printing, system software contains various report printing functions, customizable columns, export Excel Etc., the report form is flexible and accurate, and the statistics are accurate and fast.

4 Conclusion

In today's distribution facilities, the distribution security of the school dormitory project is very important. The application of the Acrel-3000 prepaid power management system in the Southwest University for Nationalities project can be used to supply and distribute the student dormitory. The real-time monitoring of electricity not only can display the power consumption of the loop, but also has the network communication function, and can form a prepaid power management system with the communication management machine and the computer. The system realizes the analysis and processing of the collected data, displays the running status of each dormitory power in real time, and has a pop-up alarm dialog box, voice prompts for the load limit, and generates various energy reports, analysis curves, graphics, etc., which are convenient for remote power. Meter reading, analysis and research, the system can automatically, accurately and quickly identify the situation of overloaded power, illegal use of electricity, etc. The system is safe, reliable and stable, and provides a reliable and reliable basis for solving the problem of electricity use in the school dormitory project, and has achieved a good management level.



references:

[1] "Guidelines and Application Guidelines for Digital Measurement of Electric Power Measurement", Ren Zhicheng, Zhou Zhong, China Electric Power Press

[2] "Application of Power Monitoring System in Power Supply and Distribution Design", Gao Shihong, Science and Technology Wind [3] "Power Monitoring for 10kv Power Supply and Distribution Design", Yao Qiang, Technology World




About the Author

Yang Junjun, female, undergraduate. Position: Now working for Ankerui Electric Co., Ltd., contact number, mobile phone, QQ






Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn

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