Yan Jianmei

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

Abstract : Ankerui remote prepaid management system is based on power management software and centralized meter reading software, including integrated systems such as computer, communication management machine and printer. It mainly completes the setting of electric energy meter parameters and user sales management. And electricity management work, easy to operate. Help property companies to conduct remote real-time operations and monitoring, have a good human-machine interface, be able to effectively count and manage data, and make effective security measures for data security. It is easy to install. It is an ideal solution for improving the level of electricity management and solving the problem of difficult charging by the management department of electricity management department, commercial plaza and school.

This paper introduces the application of remote prepaid management system in schools through the remote prepaid power management system of the Central South Aviation College of Wuhan Commercial College.

Keywords : school; prepaid management; remote meter reading;

0 Overview

Wuhan Commercial College is located at No. 225, Guanggu 2nd Road, Donghu New Technology Development Zone, Wuhan City, Hubei Province. It is a college for aviation in Hubei Province. The European campus architecture integrates history, humanities and ecology. It is an international and international The modern university, which is connected with education and has a strong cultural atmosphere, is known as the “Professional Aviation Academy of Zuimei in Central and South China”. In order to adapt to the rapid development of China's aviation industry and cultivate more high-quality aviation talents, the school district has invested 500 million to build a 700-mu modern university campus with rich cultural atmosphere, to build an aviation training center, and to have student training and regional aviation institutes. The school's centralized training, civil aviation unit initial training, on-the-job employee re-training, social experience and other functions can meet the training needs of various civil aviation positions. This project is a set of remote prepaid power management system designed for the Central South Aviation College of Wuhan Commercial College. According to the requirements of prepaid electricity sales, prepaid power management needs to be applied to the electricity used by the student dormitory to ensure that electricity is charged first.

1 System structure description

   The entire prepaid management system mainly implements the charge management and energy efficiency assessment of the 0.4kV power distribution system of the Central South Aviation College of Wuhan Commercial College; the monitoring scope is 480 DDSY1352-NK installed in the distribution box, divided into 16 buses, all on site. The meter communicates through the shielded twisted pair and the communication management machine set in the background. The data is processed by the communication management machine and uploaded to the background of the prepaid system. After the Zui, the data connection between the instrument on the bus and the monitoring host is realized, and energy efficiency management and energy management are completed. System function for charge management.

   The monitoring system adopts a layered distributed structure, that is, a station control layer, a communication layer and a space layer;

As shown in Figure 1:

Figure (1) Network topology diagram

   The interval device layer is mainly: multi-function network power meter and pre-paid multi-function meter. These devices are respectively installed in the electrical cabinet corresponding to the corresponding primary equipment. These devices all adopt RS485 communication interface, and realize on-site data collection through the on-site MODBUS bus networking communication.

   The network communication layer is mainly: communication server, its main function is to collect the scattered collection devices in the field, and remotely transmit to the station control layer to complete the data interaction between the field layer and the station control layer.

Station control management: equipped with high-performance industrial computers, monitors, UPS power supplies, printers and other equipment. The monitoring system is installed on the computer to collect and display the running status of the field device and display it to the user in the form of human-computer interaction.

   The above network instruments adopt RS485 interface and MODBUS-RTU communication protocol, RS485 adopts shielded line transmission, generally adopts two connections, the wiring is simple and convenient; the communication interface is half-duplex communication, that is, both sides of communication can receive and send data but Only data can be transmitted or received at the same time, and the data zui has a high transmission rate of 10 Mbps.

   The RS485 interface is a combination of a balanced driver and a differential receiver. It has enhanced noise immunity and allows up to 32 devices to be connected to the bus. The large transmission distance is 1.2km.

2 Remote prepaid power management main functions

   The whole system software design is divided into three large blocks, namely centralized meter reading service system, remote prepaid power management system, and user inquiry system.

The centralized meter reading service program runs all the year round, and remote meter reading is performed continuously for all the tables. The remote prepaid system includes all account opening, power selling, remote control and reporting functions; the user inquiry machine system is used for dormitory to check personal information, recharge and electricity. In addition, you can also configure the mobile terminal query network zhan, which can be used for dormitory users to query personal information, recharge, remote control and daily power consumption on the mobile phone network zhan terminal. If the conditions are met, the user can also use Alipay UnionPay. Remote self-service purchase.

The main features are as follows:

a Quick configuration, ready to use: the meter and communication management machine configuration can be used to import into the system;

b Remote centralized meter reading: eliminating manual meter reading, the real-time status of the meter can be accurate to within 3 minutes;

c Support separate pricing, multi-rate, and ladder price: electricity price, rate and ladder price can be set separately for each meter;

d Remote power sales: centralized financial management, real-time power is issued, and the number of recharges is prevented from being bi;

e Data security: The network data transmission uses a financial-grade 3DES encryption algorithm to prevent data from being stolen;

f SMS reminder: When the amount is insufficient or the amount is owed, a total of three levels of warning can be notified to the user in time;

g Remote control: It can perform remote control or remote control on any meter to facilitate remote management.

h Energy consumption analysis and query: Both users and administrators can check the daily energy consumption status of prepaid meters or meters connected to each type;

i Personal mobile phone query network zhan: support mobile phone users to purchase electricity independently, self-inquiry.

   The traditional IC card prepaid sales management system realizes the management mode of paying electricity after paying the fee first. However, since the data of the meter is dependent on the purchase of the power card, the user's power consumption data lags behind the occurrence time, which requires not only manual meter reading, but also Effective power management, monitoring and real-time control.

   Using remote prepaid power management system, without IC card, computer remote centralized meter reading, real-time monitoring, remote recharge and remote control, and then through warning information and SMS notification, as well as mobile phone network zhan, property management department can complete the entire copy Table, charging, control and verification work, achieve high information and automation, greatly improve the efficiency and level of power marketing management, save manpower and material resources, but also improve economic efficiency, while also having the security function of preventing information leakage and electricity tampering .

3 Case analysis

   Wuhan Commercial College, Central South Aviation College, the remote prepaid power management system for the monitoring and charging of the distribution box part of the four buildings, and then pre-paid power management for the dormitory electricity, and can be remote.

The distribution box adopts DDSY1352-NK series prepaid measuring instruments, which mainly measure all conventional power parameters, such as: three-phase voltage, current, active power, power factor, frequency, active energy, remaining power, and remaining amount.

   The following functions are implemented on site:

1. Centralized meter reading service system

   The centralized meter reading service program consists of three modules. In addition to the centralized remote meter reading of all instruments at regular timing, it also integrates the alarm SMS sending service, which can automatically generate mobile phone text messages from the electricity fee warning and arrears warning. For dormitory users, this feature needs to be used in conjunction with the hardware SMS mao.

   The system defaults to a remote centralized meter reading of all tables for half an hour by default, and the time interval supports personalized configuration.

2. Remote prepaid power management system

   The system is divided into five modules, namely operator login module, system configuration module, user (dormitory) management module, power sales management module, and report center module. The system is basically running and operating as follows:

All reports and record queries of this system support the export function of excel format.

Main implementation features:

   Login management: manage operator account and authority allocation, view system log and other functions; system settings: configure building, communication management machine, instrument and default parameters; user management: perform account opening, account cancellation, remote opening and closing of dormitory users Operations such as meter reading export and record inquiry; sales management: remote sales, power-off, correction, and record inquiry for the opened accounts; Report Center: providing sales financial statements, energy reports, alarm reports Wait for the query.

   Login management system settings

1 Re-login and re-log on the sales system

2 Operator management can manage operators

3 Rights Management assigns different permissions to operators

4 Operation log view to view the operator operation log

5 Modify the operator password to modify the operator password

6 Building group setting This function is used to maintain a collection of one or more power units, such as a building in a building.

7 Communication Manager Settings for Maintaining Information for All Communication Managers

8 Meter setting account number setting is used to maintain information of all instruments, support batch import

9 Number setting information for maintaining the dormitory number

10 Default parameters set the default settings of some common parameters, including “default power threshold”, “set time interval”, “default alarm amount”, “default electricity price”, “limit of hoarding amount”, “alarm short message number”

Customer management

11 Account opening maintenance of user information, opening accounts on the table, supporting the transfer of old table amounts, supporting one multi-table, supporting users to open accounts after opening accounts

12 Account Query to query all current accounts opened

13 After the account is closed, after the account is closed, all the tables that the user clicks will execute the account cancellation action, and the system automatically generates the account record.

14 Accountant Enquiry Query History Account Record

15 batch operations

1 Query all instrument status, including remaining amount, closing status, alarm information, etc.

2 electricity price delivery operation;

3 set the delivery operation;

4 power-saving, fee-controlled opening, direct pull operation;

5 Export all the table real-time status to XLS.

16 Meter Reading History Query Provides Single Table Meter Reading History Query

Sales Management Report Center

17 Sales of electricity to the opened user table sales, support document printing, automatic generation of electricity sales records

18 electricity sales inquiry sales record query

19 Power-off to power off the user list that has been opened

20 Power-off inquiry power-off record inquiry

21 When the power is sold, the power is turned off, and the repair operation is performed after the wrong operation.

22 real-time alarm record report statistical query real-time alarm record

23rd sales report query daily financial statements

24 month sales report query monthly financial statements

25-year sales report for annual financial statements

26 Lost table query report lost table query of xi

27 lost communication management machine report lost contact xi communication management machine query

28 Energy consumption analysis report According to the date range and the geographical location of the query (by floor, floor or household number), the daily energy consumption is calculated.

29 Meter energy consumption query can query the other energy meters of our company (ACR/PZ/DTSF, etc.) according to the time period, measurement loop and other conditions, as well as the remote meter reading value query.

30 Alarm record query query history alarm record

   The system not only supports one household and one table for the opening of the dormitory, but also supports the need for one household to hang multiple tables. At the same time, it supports and solves the problem that the old table amount is transferred when the old and new tables are switched after the project transformation; support peak and valley electricity price, support one Table 1 electricity price; the power overload threshold can be set for a single table, and the two-level threshold for setting a single table amount alarm is also supported.

   In the batch remote operation scenario, the system provides a variety of functions, for account opening, alarm 1, alarm 2, arrears, unopened account, lost connection status have different color display; and support remote remote control of the instrument, remote command type as follows:

1. The electricity price is issued; 2. The setting is issued (the alarm amount threshold and the overload power threshold are issued); 3. The power is guaranteed (forced meter closing); 4. The prepaid (returning automatic trip mode); Pull brake (forced power off); 6. Meter reading export (export all current table status to EXCEL)

   The system also integrates the energy meter into the system to provide a supplementary energy query report after remote centralized meter reading, which provides a strong basis for energy analysis, energy comparison and safe use of electricity. This function is used to replace the functions of some energy analysis and management systems. If professional energy analysis and management is required, an additional Acrylic energy system Acrel5000 is required.

   The system also provides multiple reports for query, which are daily/month/year financial sales statistics report, lost connection table/communication management machine query report, energy consumption query report, real-time alarm/history alarm query report, and support for export. The following are the financial statements and prepaid schedules for daily use:

Login interface

   The system can customize the personalized system login interface according to user requirements.

The system supports the function of triple-document printing when selling electricity, power-off, and account opening. The document format is as follows by default, and can be customized by the customer after confirmation:

4 Conclusion

   With the advancement of social production, the user's electricity consumption is constantly increasing. Our company provides a complete set of prepaid solutions. The system can not only receive electricity charges in advance, but also realize the “pay first, then use electricity”, and can also be different for users. It can selectively limit electricity when the power supply is tight or in response to the government's call for “energy saving and emission reduction”. Through the remote prepaid system, the system realized the electricity consumption after paying the fee first, which can avoid the problem of the school's electricity bill, thus alleviating the financial pressure. In addition, the dormitory electricity and power distribution areas are isolated to prevent the private connection. problem.   

Reference standard :

ISO/IEC11801 "International Integrated Wiring Standards"

GB/50198 "Technical Specifications for Monitoring System Engineering"

GB50052-2009 "Design Specification for Power Supply and Distribution System"

GB50054-2011 "Design Specification for Low Voltage Distribution"

IEC 61587 "Electrical Equipment Mechanical Structure Series"

DL/T448-2000 "Technical Management Regulations for Electric Energy Metering Devices"

DL/T 698.1-2009 Part 1: General

DL/T 698.2-2010 Part 2: Technical Specifications for Master Stations

DL/T 698.31-2010 Part 3.1: Technical Specifications for Power Information Collection Terminals - General Requirements

DL/T/814-2002 "Functional Automation System Functional Specifications"

DL/T5137-2001 "Technical Regulations for Design of Electrical Measurement and Energy Metering Devices"

GB2887 "Technical Conditions for Computing Station Sites"

GB/T18460.3 "IC card prepaid electricity sales system Part 3: Prepaid electricity meter"

 

About the Author:

Yan Jianmei, female, undergraduate Ankerui Electric Co., Ltd., the main research direction is smart grid power supply and distribution

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