0 Introduction The “Regulations on Energy Conservation of Public Institutions†No. 531 of the State Council of the People ’s Republic of China signed by Premier Wen Jiabao has been adopted by the 18th State Council Executive Meeting on July 23, 2008, and will be effective as of October 1, 2008. Article 14 of the “Regulations†clearly states that public institutions should implement an energy consumption measurement system, differentiate energy consumption types and energy consumption systems into household consumption, classification, and itemized measurement, and monitor energy consumption status, and timely discover, Correct the waste of energy. Jianzhi [2006] No. 277 "Technical Measures for National Civil Building Engineering Design-Energy Saving Special Volume" proposes to install electrical energy measurement devices in electrical circuits, and Jiangsu and Shanghai also launched Su Jianke [2007] No. 217 "Jiangsu" The Provincial Public Building Energy Measurement Design Regulations and Shanghai Jianjiao [2008] No. 828 “Notice on Further Strengthening the Management of Professional Energy-Saving Design Technology for Civilian Building Equipmentâ€, which further clearly proposes to separately measure the main electricity consumption facilities Buildings, shopping malls, dormitories, etc. should be measured to economic accounting units; medical wards, hotel rooms, school classrooms should be measured by floor or functional partition, etc., and included in the plan review and completion acceptance standards.
At present, the installation of the terminal energy meter generally adopts the traditional wall-mounted installation method, which has the disadvantages of large volume and inconvenient installation. The DDSF1352 / DTSF1352 rail-mounted power meter adopts a modular design, which has the advantages of small size, easy installation, and easy networking, and it is easy to implement terminal power distribution measurement. It is convenient for the retrofit of the power meter installed in the power distribution system.
1 DDSF1352 / DTSF1352 electric meter introduction
1.1 Product features
DDSF1352 / DTSF1352 single and three-phase electronic double-rate electric meter, using DIN35mm track installation, structural modular design, width and miniature circuit breaker matching, respectively 4 and 7 modules, can be easily installed in the lighting box (see figure 1). Once the maximum current is connected to 20 (80) A, the external CT needs to be connected to more than 80A, and the maximum transformation ratio can be expanded to 6000 / 5A. The meter has RS485 communication interface and supports MODBUS-RTU protocol or DL ​​/ T645 protocol. The transparent flip cover and the shell on the terminal block can be sealed to achieve the purpose of preventing electricity theft. In addition to being used for internal energy measurement and evaluation management of enterprises and institutions, this form can also be used as a trade settlement form after being tested and verified by the power supply department. This product meets the requirements of GB / T 17215-2002 "Class 1 and 2 Static AC Active Energy Meters" and GB / T 15284-2002 "Special Requirements for Multi-rate Energy Meters".
Figure 1 The appearance and installation method of the electric meter
1.2 Design principles
1.2.1 Design principle of single-phase DDSF1352 electric meter
DDSF1352 single-phase complex rate energy meter adopts the single chip design of ADI's latest technology ADE7169F16 system-on-chip. ADE7169 integrates high-precision measurement unit module and 8052 MCU and its peripheral modules. The measurement module has high measurement accuracy, can measure the current parameters of each phase current, voltage effective value, each phase and total active power, reactive power, grid frequency and other operating parameters , The overload multiple is large. The on-chip 8052 MCU has 16K FLASH and 512B RAM and various peripheral modules. It supports an on-chip RTC module, LCD driver module, power management module, SPI / I2C interface module, and UART communication module that support low-power temperature compensation. ADE7169 can realize the design of single-phase complex rate multi-function energy meter. The specific design block diagram is shown in Figure 2.
Figure 2 Single-phase DDSF1352 electric meter principle block diagram
1.2.2 Design principle of three-phase DTSF1352 electric meter
DTSF1352 three-phase electronic double-rate electric energy meter adopts measurement chip ATT7030A and 8-bit single chip M68HC908LJ12 of Freescale Company to realize. The principle is: the real-time voltage and current on the line are coupled by high-precision transformers, and the sampling circuit samples the samples and sends them to the special chip ATT7030A (the A / D converter is converted into digital signals), and the electrical energy is output by the dedicated DSP on-chip. Pulse), sent to the MCU through the pulse, and complete the time-sharing active and reactive power measurement and the maximum demand calculation according to the preset time period, make corresponding processing separately, and store it in the EEPROM; at the same time realize display and output, RS485 serial data transmission. The specific design block diagram is shown in Figure 3.
Figure 3 Block diagram of three-phase DTSF1352 electric meter
2 Application Case
2.1 The one-time plan takes the student dormitory of a university of science and technology as an example. The building has 4 floors, each floor has 24 dormitories, equipped with public toilets, laundry rooms, and public baths. The electrical primary plan is shown in Figure 4. The incoming circuit of the main distribution box is equipped with a screen-mounted ACR230ELH multi-function power meter to measure the total power of the dormitory. A total of 34 electrical parameters including three-phase active energy, reactive energy, power, power factor, current, voltage, frequency, and split-phase power are included. Detection and analysis of current and voltage 2 ～ 31th order harmonic components, current and voltage unbalance, current and voltage positive and negative zero sequence components. Seven DTSF1352 meters are used to measure the three-phase active energy of each floor, emergency lighting, fan, and reserved electrical main line. The meters can be installed side by side with the CM1 circuit breaker, or can be installed centrally above the box. The energy of dormitory rooms, public toilets, laundry rooms, and corridors on each floor is measured by 27 single-phase electricity meters DDSF1352, and the public bathroom is measured by one three-phase DTSF1352.
Figure 4 Primary electrical plan of dormitory building
2.2 System network distribution system primary plan diagram lists the number of branches of the total distribution box and the distribution box of the lighting box on the first floor of the dormitory and the model of the energy meters of each branch. In order to meet the needs of intelligent monitoring and remote automatic meter reading, the electric energy management system adopts RS485 bus, which will install an ACR230ELH multifunctional power meter installed in the main inlet of the main distribution box AL1, installed in WL1 ～ WL7 and public bathrooms on each floor 11 sets of DTSF1352 three-phase rail-type watt-hour meters and 108 DDSF1352 single-phase rail-type watt-hour meters (27 × 4-storey dormitory buildings) installed on each floor of the dormitory building are centralized networking, and the monitoring center is equipped with monitoring computers, printers, The communication server and necessary auxiliary equipment are installed with the energy management system EMS software to complete the remote collection and centralized processing of the energy meters. The power management system diagram is shown in Figure 5.
Figure 5 System networking solution
2.3 Power management system functions
2.3.1 Remote electrical parameter measurement.
Completed the real-time electrical parameter collection of the ACR230ELH multi-function power meter, including three-phase current, voltage, power, power factor, active power, reactive power, frequency, etc., displayed on the main screen of energy management; Remote automatic meter reading function of 11 DTSF1352 three-phase watt-hour meters and 108 DDSF1352 single-phase watt-hour meters; automatic calculation of daily and monthly electricity consumption and shared energy calculation functions of each dormitory; through the combination of the system and field instruments The total incoming lines and branches of outgoing electric energy and the stratification, classification and household measurement management of each end user. See Figure 4. ACR230ELH diagnoses the power quality of dormitory buildings such as current harmonics and unbalance, and the system keeps historical records to provide a basis for decision-making for the next step of power quality improvement.
2.3.2 Operation status monitoring.
The administrator can set the collection frequency of the system, for example, every 15 minutes, and set the power load value of each circuit (such as the dormitory load is set to 6 ~ 10A), the system can process the collected value according to the settings , And an audible and visual alarm is given to the overload circuit to remind the administrator that the circuit has abnormal status information. The system can also self-check the communication abnormality of each loop, so that the maintenance personnel can timely debug and repair.
2.3.3 Trend analysis.
Classify and identify the collected electrical parameters and store the necessary parameters in the database. The data storage of all electrical parameters can be up to two years, the data storage of electrical parameters can be up to three years, and can be changed according to user needs and hardware configuration. Storage time. The system provides two kinds of curve analysis interfaces, real-time curve and historical trend. By calling the real-time curve interface of the related circuit, the current operating load status of the circuit is analyzed. The historical trend of the system means that the system can view the historical trend of all stored data, and display various curve screens by calling, which is convenient for engineering personnel to perform quality analysis on the monitored power distribution system. For example: the current trend, power trend and harmonic trend analysis of the total incoming line; the monthly electricity trend of the branch circuit, bar graph / line graph analysis, etc., and it can also generate a measurement database compared with the same period last year / previous year.
2.3.4 Report printing.
The system can design various types of reports according to user needs. Such as: real-time report, historical report, event failure and alarm record report, operation record report, etc. All data values ​​recorded by the system can be queried and printed, and daily, monthly, quarterly, and annual reports of electrical energy are automatically generated. The rate report of electric energy is generated according to the time period of the double rate and the set value of the rate. The starting point, interval and other parameters of the query printing can be set by themselves, and the charge report is automatically generated for internal charge management.
2.4 Project cost According to the primary plan and system structure, the material name, model, quantity, and quotation of the energy management system of the dormitory building are shown in Table 1. The investment without labor cost is about 1145,000 yuan.
Table 1 Unit (Yuan)
Numbering | Name | Type number | Quantity | unit price | total |
1 | Multifunctional power meter | ACR230ELH | 1 | 3000.00 | 3000.00 |
2 | Three-phase rail type watt-hour meter | DTSF1352 | 11 | 1000.00 | 11000.00 |
3 | Single-phase rail type watt-hour meter | DDSF1352 | 108 | 500.00 | 54000.00 |
4 | Communication cable | RVVP2 × 1.0 | 1000 | 3.30 | 3300.00 |
5 | Serial Server | ACRNET-PORT8 | 1 | 6500.00 | 6500.00 |
6 | Monitoring computer | DELL brand | 1 | 5000.00 | 5000.00 |
7 | printer | HP A4 printer | 1 | 1200.00 | 1200.00 |
8 | Power system software | Acrel-3000 | 1 | 30000.00 | 30000.00 |
9 | other attachments | Cables, sockets, etc. | 1 | 500.00 | 500.00 |
Total | 114500.00 | ||||
3 Conclusion
In January 2009, DDSF1352 / DTSF1352 single-phase and three-phase meters passed the inspection commissioned by the National Energy Meter Quality Supervision and Inspection Center (Jiangsu), and all indicators were qualified. In addition to a certain university of science and technology, the product has also been used in a cigarette factory in Changsha, a central hospital in Yuncheng, and the 9156 project in a police district in Shanghai, and has achieved good social benefits.
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