Xu Shuang

Ankerui Electric Co., Ltd., Shanghai Jiading 201801

0 Preface

With the progress of society, the rapid development of our country's economy, the company's office environment and methods have undergone tremendous changes, professional office buildings in major cities everywhere. The emergence of office buildings has led to a centralized and highly efficient corporate office. However, the simultaneous development of office property management is a great promotion for business services. In the current market, most of the management of office buildings is still semi-informative. There is no special information management system for real estate management of office buildings. Therefore, the Acrel-3000 power management system independently developed by Acrel can timely detect the waste of power consumption and provide data for building energy efficiency assessment.

The consumption of electrical energy is concentrated in low-voltage distribution terminals. In order to strengthen the measurement and management of terminal energy measurement, and facilitate the user's on-site use, transformation and upgrading, the traditional DDSD and DTSD series wall-mounted energy meters are designed for inconvenience in field installation. A miniaturized rail-mounted energy meter has the advantages of high measurement accuracy, strong overload capacity, stable and reliable performance, wide operating voltage range, and low power consumption. And its small size, light weight, modular structure, can be used in conjunction with miniature circuit breakers installed in the distribution box, to achieve terminal power distribution measurement.

2 Design Principles

2.1 Single Phase DDSF1352 Meter Design Principle

The DDSF1352 single-phase multi-rate power meter is implemented using 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, voltage RMS, phase and total active power, reactive power, grid frequency and other operating parameters of each phase. , overload multiples. On-chip 8052 MCU with 16K FLASH and 512B RAM and a variety of peripheral modules to support low-power temperature compensation on-chip RTC module, LCD driver module, power management module, SPI/I2C interface module and UART communication module, etc. The ADE7169 can realize single-phase multi-rate multi-function power meter designs. The specific design block diagram is shown in Figure 1.

Figure 1 Single-phase DDSF1352 meter functional block diagram

2.2 Three-phase DTSF1352 meter design principle

The DTSF1352 three-phase electronic multi-rate meter is implemented using the metering chip ATT7030A and Freescale's 8-bit microcontroller M68HC908LJ12. The principle is: real-time voltage and current on the line are coupled by high-precision transformer. After the sampling circuit is sampled separately, it is sent to the special meter ATT7030A for electricity metering (A/D converter is converted into digital signal, and the power is output after dedicated DSP operation on chip. Pulses) are sent to the MCU through pulses, and time-division active power, reactive power metering, and maximum demand calculations are completed according to a preset period of time. They are processed accordingly and stored in EEPROM ; display and output are realized at the same time. RS485 serial data transmission. The specific design block diagram is shown in Figure 2.

Figure 2 Three-phase DTSF1352 meter functional block diagram

3 Electric power meter should be used for large-scale public building energy measurement

Electricity metering of large public buildings should use electric meters as internal management electric meters, and charging electric meters should not be used. The main characteristics of the two are summarized below (see Table 1).

Table 1 Comparison of Charge Meter and Power Meter

Electric meter

content

Charging meter

Power Meter

Outline

Installation method

For wall-mounted installation, the meter box should be set separately and it is not easy to install in low-voltage cabinets, power boxes, lighting boxes

Guide rail installation, easy to install in the power box, lighting box

Embedded installation, easy to install on the low voltage cabinet, power box door

Communication Protocol

DL/T645 specification is incompatible with distribution systems

Modbus protocol or DL/T645 protocol, Modbus protocol compatible with distribution systems

The power supply department generally implements a one-for-one charging system for users, that is, charging meters are installed by the power supply department. Therefore, in addition to meter licenses issued by the Bureau of Technical Supervision, the meter-charged electricity meter also requires the local provincial and municipal power department.

The license of the door can be installed and used. In the power management of large-scale public buildings, the power supply department generally installs a toll meter at the total line entrance.

The power meter is installed on the basis of the user's installation of the meter charge, taking into account the need for internal energy metering and energy management, and is used for internal power management. Therefore, users can independently choose to purchase, but should pay attention to whether the manufacturer has a meter license for the power meter (electric energy part). The power meter can complete the collection of sub-item power data for each loop, each floor or each functional area, and complete the sub-item energy metering for large-scale public buildings through the background power management system.

4 Type selection scheme of power meter in energy item measurement

Electric power meters are designed for the power monitoring, power management and management of power systems, industrial and mining enterprises, public utilities, and smart large public buildings . It can measure all commonly used power parameters with high precision, such as three-phase voltage, three-phase current, active power, reactive power, frequency, power factor, four-quadrant electric energy, etc. , and uses high-visibility LCD to display the measurement parameters of the meter. And grid system operation information. The power meter has a wide range of functions, models, and prices, as well as a variety of energy metering schemes. Therefore, it should be reasonably matched to achieve a better price/performance ratio.

According to Document No. 114 of the Ministry of Housing and Urban-Rural Development, the energy consumption data of large-scale public buildings shall be classified and measured separately, and the electricity shall be measured and managed according to power, lighting and outlet power, air-conditioning power, and special electricity. Therefore, DDS1352 or DDSF1352 electricity meters can be used for places where dorms, offices, shops, wards, etc., should be measured into economic accounting units;

DDS1352 single-phase electricity meter for single-phase energy metering, DIN35mm rail installation, a width of 1 module (that is, a width of 18mm), a maximum access to single-phase current 30A, precision 1.0. The advantages are small size and low price. The disadvantage is that there is no communication function and no network can be established.

DDSF1352 single-phase electricity meter, also installed on DIN35mm rails, has a width of 4 modules, a maximum access single-phase current of 80A, accuracy of 1.0, peak, flat, and valley energy time-multi-rate metering functions, with RS485 interface , Modbus protocol or DL/T645 protocol can be networked. It is mainly used for the measurement of single-phase electric energy and is often used in distribution boxes. The appearance and application of DDS1352 and DDSF1352 single-phase electricity meters are shown in Figure 3.

 

Figure 3 DDS1352 meter appearance, DDSF 1352 meter appearance and its application

According to the electricity consumption facilities, the electricity consumption of power outlets, power, air-conditioning, and special electricity will be measured separately. When school classrooms, medical wards, and hotel rooms are measured in floors or functional areas, DTSF1352 or ACR120EL meters can be used. .

Use DTSF1352 three-phase four-wire meter (see Figure 4), for three-phase energy metering, with peak, peak, flat, valley energy hourly and multi-rate metering function, DIN35mm rail installation, width of 7 modules, can be installed In the lighting box or power box, the maximum access to three-phase current 80A, 80A or more can be collected by current transformers, accuracy of 0.5, with RS485 interface, Modbus protocol or DL/T645 protocol, can be networked.

Figure 4 DTSF1352 meter appearance and its application in the power box

Use ACR120EL multi-function electric meter, this table is embedded installation, can be installed in the power box or low voltage outlet cabinet door panel, panel size is 80mm×80mm, specifications are 220/380V, 5A, current is connected through the transformer, accuracy is 0.5 Can measure current, voltage, power, frequency, power factor, four-quadrant electrical energy and other electrical parameters, with Modbus communication protocol.

Some important occasions need to detect harmonics, can use ACR230ELH multi-function meter, for the incoming circuit or the important outlet circuit, using ACR230ELH multi-function meter, embedded in the distribution cabinet door panel, the face frame size is 96mm x 96mm, except In addition to measuring all electrical parameters, it also has a maximum demand, 2-31 currents, voltage harmonics, voltage crest factor, current K-factor, telephone waveform factor, current-voltage imbalance, and positive and negative zero-sequence component analysis. ACR120EL, ACR230ELH multi-function profile meter and its practical application in low voltage distribution cabinets as shown in Fig.

Figure 5 ACR 120EL, ACR 230ELH multi-function meter profile

And its application in distribution drawers

5 System Software Introduction
5.1 System Structure

Acrel-3000 energy management system can measure the energy consumed by low-voltage equipment. The system consists of three parts: station management layer, network communication layer and field device layer.
　　 The field equipment layer adopts AZX J, Ancorui low-voltage smart metering box, to install pre-paid energy meters and rail-mounted energy meters. Through the use of low-voltage smart metering boxes in conjunction with the power management monitoring system and the use of computers, back-office monitoring and management software, and network communication technologies, the collected energy consumption data of electrical equipment is uploaded to a unified monitoring and management platform to realize monitoring and management of electrical power systems. , Reasonable control of high-energy consumption equipment, and ultimately make the entire power system to achieve energy-saving effect. The power management system network topology is shown in the figure below.

5.2 System Functions

The Accor terminal power management system refers to the installation of rail-mounted and pre-paid energy metering devices in buildings such as commercial buildings, office buildings, farmer's markets, and dormitories, and uses remote transmission and other means to collect energy data from various monitoring points in time and use them. Electricity prepaid management, using the mode of buying electricity first and then using electricity, can be used to transfer operational risks, and can recover electricity fees in advance, reducing the workload of personnel in later operations; realizing networked real-time operation, real-time measurement and monitoring , Instant sales and back-off, instant power off control effect. It completely solves many problems in the past such as the power management system composed of carrier communication meters and other energy collection equipments, such as cumbersome power management, poor system stability, non-transparent data, arrears, etc., and can be self-service through self-service terminals or the Internet. Artificially complicated process. Through the terminal electricity management system, it can reasonably control the use of electricity, and strictly charge the excessively used electricity fees. Enterprises or users can find out the rationality of electricity consumption and manage them according to the electricity purchase situation.

5.2.1 Main Functions of the System
(1) Real-time power monitoring: The statistics of the accumulated power consumption, remaining power, and switch status of the meter can be used to easily query the power consumption of each room, store, or apartment building, saving time and effort.
(2) Centralized meter reading: The daily electricity consumption of the room will be automatically stored in the database every time. The electricity consumption of the room can be queried at any time so that electricity consumption is transparent and the user can clearly consume it.
(3) Historical electricity records: The user's electricity records are stored in the database, and can be summarized by hour, day, and month to generate an Excel report.
(4) Record query: records of management records for prepaid electricity meters. Can easily check the amount, time and other information.
(5) Sales log management: The log records the information of successful sales, the reasons for the failure, and the retrospective mechanism.
(6) Self-help: Through Internet cards or self-service terminals, users can make prepayments on the instrument in real time without manual queues, but data cannot be rolled back after a periodic power failure.
(7) Card Management: The denomination, expiration date, and status of the card.
(8) Refund processing: When the merchant or dormitory staff changes, the remaining electricity in the room can be refunded and the details can be printed out.
(9) Insufficient balance: Short message and email reminder: In the system, the warning electricity quantity can be set as required. When the warning quantity is less than or equal to the warning electricity quantity, the system automatically makes a reminder of insufficient balance according to the contact information left by the user.
(10) Equipment management: Unified management and maintenance of the information related to the post-control of the instrument's address, ownership organization, and detection cycle.
(11) Time-sequential transmission: According to the date, time, floor, user category control, greatly reducing the workload of logistics management personnel.
(12) Automatic power off reminder: When the balance is insufficient, the power is automatically turned off for a period of time, and then the power supply is automatically restored.
(13) Hoarding power setting: The “power hoarding” can be preset for the meter through the power selling system. When the sum of the newly purchased power of the user and the remaining power in the watch is greater than the preset “hoarding power”, the meter rejects the receiving card. The newly purchased electricity will be added to the table only when the remaining electricity in the table is used until the sum of its newly purchased electricity is less than the “hoarded electricity”.
(14) Ladder price: The user's electricity consumption is set to a number of steps or sub-rating pricing calculations. Applying a stepwise incremental power price to electricity can improve energy efficiency.
(15) Load safety restriction: Malignant load and super power automatic power-off function. After the malignant load and super power are eliminated, the system automatically restores power supply and protects the power environment.

5.2.2 System Main Software Interface

6 Conclusion

The application practice shows that the use of the Acrel-3000 power management system makes office building management work more efficient and information-based, greatly improving employee satisfaction and work efficiency , and saving business management costs; the system's decision support module passes data Comprehensive collation and analysis provide the basis for the implementation of the next plan of the manager, making the management decision more scientific.

references:

[1] Ankerui Electric Co., Ltd. System Solution, 2013.1.

About the Author:

Xu Shuang, female, undergraduate, Ankerui Electric Co., Ltd., the main research direction for intelligent power monitoring and power management system, Email: Mobile QQ

"Atlas of Design and Application of Building Energy Consumption Monitoring and Management System" (atlas number: ACR12CDX301) edited by Ankerui Electric Co., Ltd. and Shandong Construction Electrical Technology Information Network, this atlas combined with Acrel-5000 energy consumption The monitoring system complies with the electrical design specifications and meets the requirements for the construction of energy-saving supervision systems for office buildings and public buildings of state agencies, to achieve the scientific and data-based management of green building energy use, and to achieve the goal of saving energy and reducing consumption of green buildings. The Atlas is applicable to the system design, construction, operation and maintenance of energy monitoring and management of office buildings and public buildings of newly-built or rebuilt national offices. If you need atlas, please provide your organization's name, department, address, zip code, contact person, contact telephone number, email address, fax 021-69155331, mail or QQ to Ankeru Xu cream engineer, Ankerui Electric will give you a free gift. .

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