00 Introduction Introduction With the progress of society and the rapid development of China's economy, the office environment and methods of enterprises have undergone tremendous changes, and professional office buildings are everywhere in major cities. The emergence of office buildings has made local enterprises more centralized and efficient. However, the simultaneous development of office property management is a great promotion for corporate services. In the current market, most of the office property management is still in a semi-information state, and there is no special information management system for the property management of office buildings. Therefore, the Acrel-3000 power management system independently developed by Ankerui can detect the waste of correcting electricity in time and provide data for building energy conservation assessment. The consumption of electric energy is concentrated in the low-voltage distribution terminal. In order to strengthen the measurement and management of the terminal electric energy, it is convenient for users to use, renovate and upgrade on-site. It is designed to be inconvenient for the installation of the traditional DDSD and DTSD series wall-mounted electric energy meters. A miniaturized rail-mounted electric energy meter has the advantages of high measurement precision, strong overload capability, stable and reliable performance, wide working voltage range and low power consumption. And its small size, light weight, structural modularization, can be used in conjunction with miniature circuit breakers to be installed in the distribution box to achieve terminal distribution energy metering.
2 2 Design principle Design principle 2.1 Single-phase DDSF1352 Electric meter design principle DDSF1352 Single-phase multi-rate electric energy meter is completed by single-chip design of ADI's latest technology ADE7169F16 system-on-chip. The ADE7169 integrates a high-precision metering unit module and an 8052 MCU and its peripheral modules. The metering module has high measurement accuracy and can measure the current and voltage RMS of each phase, the phase and total active power, reactive power, grid frequency and other operating parameters. The overload factor is large. The on-chip 8052 MCU features 16KFLASH and 512B RAM and a variety of peripheral modules. It supports low-power temperature compensated on-chip RTC modules, LCD driver modules, power management modules, SPI/I2C interface modules, and UART communication modules. A single-phase multi-rate multi-function energy meter design can be realized. The specific design block diagram is shown in Figure 1.
3 3 Large-scale public construction electric energy measurement should adopt electric power meter Large public construction electric energy measurement should adopt electric power meter Large public building electric energy measurement should adopt electric power meter as internal management electric meter, and it is not suitable to use charging electric meter. The main features of the two are summarized below (see Table 1). 
The power supply department generally implements a charging system for one household and one meter for the user, that is, the charging meter is uniformly installed by the power supply department. Therefore, in addition to the metering device license issued by the technical supervision bureau, the meter must also be licensed by the local provincial and municipal power departments before installation and use. In the power management of large public buildings, the power supply department usually installs a charging meter at the main entrance. The power meter is installed on the basis of the user's installation of the meter and considers the need for internal energy metering and energy-saving management for internal power management. Therefore, the user can choose to purchase independently, but should pay attention to whether the manufacturer has a metering license for the power meter (electrical part). The power meter can complete the collection of the energy data of each loop, each floor or each functional area, and complete the energy metering of the large public buildings through the background power management system.
4 4 Power Meter Selection in Power Metering The selection of power meter in energy metering is based on power monitoring and power management for power systems, industrial and mining enterprises, utilities, and intelligent large public buildings. Designed for demand. 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 power, etc., using a highly visible LCD to display meter measurement parameters. And operational information of the grid system. The power meter has many functions and models, and the price is different. The energy metering scheme is also various. Therefore, it should be reasonably matched to achieve better cost performance. According to Document No. 114 of the Ministry of Housing and Urban-Rural Development, the energy consumption data of large-scale public buildings will be classified and sub-metered, and the electric energy will be classified and managed according to power consumption, lighting and socket electricity, air-conditioning electricity and special electricity. Therefore, for the quarters, office buildings, shops, wards, etc., where the economic accounting unit should be measured, the DDS1352 or DDSF1352 meter can be used;
DDS1352 single-phase electric meter for single-phase energy metering, DIN35mm rail mounting, width 1 module (ie 18mm wide), maximum single-phase current 30A, accuracy 1.0. The advantage is that the size is small, the price is low, and the disadvantage is that there is no communication function and the network cannot be set up. DDSF1352 single-phase electric meter, also installed on DIN35mm rail, width is 4 modules, maximum single-phase current is 80A, accuracy is 1.0, with peak, flat and valley energy time-sharing multi-rate metering function, 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 commonly used in distribution boxes. The appearance and application of the DDS1352 and DDSF1352 single-phase meters are shown in Figure 3:
DTSF1352 or ACR120EL meter can be used for metering of electricity, power, air conditioning, and special electricity for electricity use. . It adopts DTSF1352 three-phase four-wire electric meter (see Figure 4) for three-phase energy metering. It has tip, peak, flat and valley energy time-sharing multi-rate metering function, DIN35mm rail mounting, width is 7 modules, can be installed In the lighting box or power box, the maximum connection of three-phase current 80A at a time, 80A or more can be collected by current transformer, the accuracy is 0.5, with RS485 interface, Modbus protocol or DL/T645 protocol, can be networked. 
The ACR120EL multi-function electric meter is used for embedded installation. It can be installed on the power box or low-voltage outlet cabinet door panel. The panel size is 80mm×80mm, the specification is 220/380V, 5A, and the current is connected through the transformer. The accuracy is 0.5. It can measure current, voltage, power, frequency, power factor, four-quadrant energy and other electrical parameters, with Modbus communication protocol. For some important occasions to detect harmonics, ACR230ELH multi-function electric meter can be used. For the incoming circuit or important outgoing circuit, ACR230ELH multi-function electric meter is used, which is embedded in the distribution cabinet door panel. The size of the frame is 96mm×96mm. In addition to measuring all electrical parameters, it also has the maximum demand, 2-31 current, voltage harmonic component, voltage peak coefficient, current K coefficient, telephone waveform factor, current voltage imbalance, positive and negative zero sequence component analysis. The shape of the ACR120EL, ACR230ELH multi-function meter and its practical application in the low-voltage power distribution cabinet are shown in Figure 5. 
6 Conclusions The application practice shows that the use of Acrel-3000 power management system makes office property management work efficient and informative, which greatly improves employee satisfaction and work efficiency, and saves enterprise management costs; the system's decision support module passes The comprehensive organization and analysis of the data provides a basis for the implementation of the manager's next plan, making the management decision more scientific.
2 2 Design principle Design principle 2.1 Single-phase DDSF1352 Electric meter design principle DDSF1352 Single-phase multi-rate electric energy meter is completed by single-chip design of ADI's latest technology ADE7169F16 system-on-chip. The ADE7169 integrates a high-precision metering unit module and an 8052 MCU and its peripheral modules. The metering module has high measurement accuracy and can measure the current and voltage RMS of each phase, the phase and total active power, reactive power, grid frequency and other operating parameters. The overload factor is large. The on-chip 8052 MCU features 16KFLASH and 512B RAM and a variety of peripheral modules. It supports low-power temperature compensated on-chip RTC modules, LCD driver modules, power management modules, SPI/I2C interface modules, and UART communication modules. A single-phase multi-rate multi-function energy meter design can be realized. The specific design block diagram is shown in Figure 1.
2.2 Three-phase DTSF1352 Electric meter design principle DTSF1352 Three-phase electronic multi-rate electric energy meter is realized by measuring chip ATT7030A and Freescale's 8-bit single-chip M68HC908LJ12. The principle is as follows: the real-time voltage and current on the line are coupled by a high-precision transformer, and the sampling circuit is separately sampled and sent to the power metering chip ATT7030A (the A/D converter is converted into a digital signal, and the power is output through the on-chip dedicated DSP operation). Pulse), sent to the MCU through the pulse, and completes the time-sharing active, reactive power measurement and maximum demand calculation according to the preset time period, respectively, and correspondingly processed and stored in the EEPROM; at the same time realize display and output, RS485 serial data transmission. The specific design block diagram is shown in Figure 2.
4 4 Power Meter Selection in Power Metering The selection of power meter in energy metering is based on power monitoring and power management for power systems, industrial and mining enterprises, utilities, and intelligent large public buildings. Designed for demand. 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 power, etc., using a highly visible LCD to display meter measurement parameters. And operational information of the grid system. The power meter has many functions and models, and the price is different. The energy metering scheme is also various. Therefore, it should be reasonably matched to achieve better cost performance. According to Document No. 114 of the Ministry of Housing and Urban-Rural Development, the energy consumption data of large-scale public buildings will be classified and sub-metered, and the electric energy will be classified and managed according to power consumption, lighting and socket electricity, air-conditioning electricity and special electricity. Therefore, for the quarters, office buildings, shops, wards, etc., where the economic accounting unit should be measured, the DDS1352 or DDSF1352 meter can be used;
DDS1352 single-phase electric meter for single-phase energy metering, DIN35mm rail mounting, width 1 module (ie 18mm wide), maximum single-phase current 30A, accuracy 1.0. The advantage is that the size is small, the price is low, and the disadvantage is that there is no communication function and the network cannot be set up. DDSF1352 single-phase electric meter, also installed on DIN35mm rail, width is 4 modules, maximum single-phase current is 80A, accuracy is 1.0, with peak, flat and valley energy time-sharing multi-rate metering function, 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 commonly used in distribution boxes. The appearance and application of the DDS1352 and DDSF1352 single-phase meters are shown in Figure 3:
5 5 System Software Introduction System Software Introduction 5.1 System Structure Acrel-3000 The power management system can measure the energy consumed by low-voltage equipment. The system consists of three parts: station control layer, network communication layer and field equipment layer. The field equipment layer adopts Ankerui low-voltage intelligent metering box AZX J, which is equipped with prepaid electric energy meter and card-type electric energy meter. Through the low-voltage smart metering box and the power management monitoring system, the computer, background monitoring management software and network communication technology are used to upload the collected energy consumption data of the electrical equipment to a unified monitoring and management platform to realize the monitoring and management of the power system. The reasonable control of high-energy-consuming electrical equipment ultimately results in energy-saving effects for the entire power system. The topology diagram of the power management system network is shown in the figure below.
5.2 System Function Ankerui terminal power management system refers to the installation of rail-type and pre-paid energy metering devices in commercial buildings, office buildings, farmer's markets, dormitory and other buildings, and remotely transmitting and collecting energy data of each monitoring point. Pre-paid management of electricity consumption, using the mode of first buying electricity and then using electricity, can be used to transfer business risks, and can recover electricity charges in advance, reducing the workload of personnel operating in the later period; realizing networked real-time operation, Real-time metering and monitoring, real-time sales and de-energization, instant power-off control effects. It completely solves many problems such as cumbersome power management, poor system stability, opaque data, and arrears of payment in the power management system composed of power communication devices such as carrier communication meters, and can be self-recharged through self-service terminals or the Internet. Carry out artificial and complicated recharge process. Through the terminal power management system, the power consumption can be reasonably controlled, and the electricity charges for exceeding the standard are strictly collected. The enterprise or the user can find out the rationality and management of the power consumption according to the power purchase situation.
5.2.1 Main functions realized by the system (1) Real-time power consumption monitoring: statistically record the accumulated power consumption, remaining power, switch status and other parameters of the instrument, which can conveniently query the electricity consumption of each room, shop or whole apartment building. The situation saves time and effort. (2) Centralized meter reading: Automatically store the electricity consumption of the room every day and every day in the database. Whenever the electricity consumption of the room can be queried, the electricity consumption is transparent, so that the user can clearly understand the consumption. (3) Historical electricity record: store the user's electricity record in the database, and can summarize the hour, day and month to generate an Excel report.
(4) Recharge record inquiry: Manage the record of recharge of the prepaid meter. It is convenient to check the recharge amount, recharge time and other information. (5) Sales log management: The log records the information of successful sales, the reason for failure, and the backtracking mechanism. (6) Self-service recharge: It can be recharged through the Internet recharge card or self-service terminal, so that users can pre-pay the instrument in real time without manual queue waiting, but can not recharge during periodic power-off. After recharging failure, data is saved. Roll back. (7) Recharge card management: record the face value, validity period and status of the recharge card. (8) Refund processing: When the merchant or dormitory personnel change, the remaining power of the room can be refunded and the details printed. (9) Insufficient balance SMS, email reminder: In the system, the warning power can be set as required. When the power is less than or equal to the warning power, the system automatically reminds the 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, such as the address, home organization, and detection period of the instrument. 5.2.1 Main functions realized by the system (1) Real-time power consumption monitoring: statistically record the accumulated power consumption, remaining power, switch status and other parameters of the instrument, which can conveniently query the electricity consumption of each room, shop or whole apartment building. The situation saves time and effort. (2) Centralized meter reading: Automatically store the electricity consumption of the room every day and every day in the database. Whenever the electricity consumption of the room can be queried, the electricity consumption is transparent, so that the user can clearly understand the consumption. (3) Historical electricity record: store the user's electricity record in the database, and can summarize the hour, day and month to generate an Excel report.
(11) Timed power transmission: Classified control by date, time, floor and user category, which greatly saves the workload of logistics management personnel.
(12) Automatic power-off reminder: When the balance is insufficient, it will automatically power off for a period of time, and then automatically restore power.
(13) Hoarding power setting: The electric power meter can preset the “hoarding power†through the power selling system. When the sum of the user's newly purchased power and the remaining power in the meter is greater than the preset “hoarding powerâ€, the meter rejects the receiving card. The newly purchased power can only be added to the table when the remaining power in the meter is used until the sum of the newly purchased power is less than the “hoarding powerâ€.
(14) Step price: Set the user's electricity consumption to a number of ladder segments or sub-price pricing calculation fees. Step-by-step incremental electricity prices for electricity use can increase energy efficiency.
(15) Load safety restrictions: malignant load, super power automatic power-off function, after the malignant load and super power are removed, the system automatically restores the power supply and protects the power environment.
5.2.2 System main software interface
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