Ankerui Qingqing Abstract: Introducing the Hitachi Electric Power Monitoring System , using smart power meters to collect various electrical parameters at the distribution site. The system uses on-site network in place way back through the field bus communication network and remote to the background, manage power distribution circuit of electricity substation by Acrel- 2 000 type electric energy management systems. Keywords: Hefei Hitachi Jianji Power Monitoring; 10KV Substation; Intelligent Power Meter; Microcomputer Protection;Acrel-2000; Power Monitoring System Overview  Hitachi Construction Machinery is a world-leading manufacturer of construction equipment and is headquartered in Tokyo. We sell our products worldwide through our global distribution network. Hitachi Construction Machinery (China) Co., Ltd. was established in March 1995 and is located in the Economic and Technological Development Zone of Hefei City, Anhui Province. It covers an area of ​​680,000 square meters. It is built by Hitachi Construction Machinery Co., Ltd., Mitsubishi Corporation, and Hong Kong and Wing Industrial Co., Ltd. The large-scale foreign-invested enterprise that the company is jointly funded by the three parties has a registered capital of 800 million yuan and a total investment of 1.7 billion yuan. At present, there are 1,454 Chinese employees and 31 Japanese employees. The company mainly conducts research and development and manufacturing of construction machinery. This project is one of the substations' power monitoring systems. According to the requirements of power distribution system management, power monitoring must be performed on the incoming and outgoing power distribution cabinets of substations to ensure the safety, reliability, and efficiency of power usage. Acrel-2000 low-voltage intelligent power distribution system makes full use of the latest developments in modern electronic technology, computer technology, network technology and fieldbus technology, and conducts distributed data acquisition and centralized monitoring and management of the power distribution system. The secondary equipment of the distribution system is networked. Through the computer and the communication network, the field devices of the decentralized power distribution station are connected into an organic whole, and remote monitoring and centralized management of the power grid operation are realized. 1 System Structure Description The monitoring system mainly implements power distribution monitoring and power management of Hitachi Akiaki 10KV high-voltage substation; the scope of monitoring is microcomputer protection of substations and multi-function electricity meters for remote real-time monitoring and power management. The system has a total of 33 devices, including 23 microcomputer protection, 4 multi-function power meters and DC screens, temperature controllers, photovoltaic longitudinal differential protection devices, and small current grounding line selection devices, to achieve the instrumentation and monitoring host on the bus Data connectivity. The monitoring system adopts a hierarchical distributed structure, namely station control layer, communication layer and bay layer; as shown in Figure (1): Figure (1) Power Monitoring System Diagram Interval equipment layer mainly includes: microcomputer protection, multi-function power meter and DC screen, temperature controller, photovoltaic longitudinal differential protection device, and small current grounding line selection device. These devices correspond to the corresponding primary equipment installed in the power distribution cabinet of the substation. These devices all use RS485 communication interfaces to achieve on-site data acquisition through field MODBUS bus networking. The main network communication layer is: communication server and industrial network switch. Its main function is to collect the scattered data at the site collection device, and transmit it to the station control layer at the same time, to complete the data exchange between the field layer and the station control layer. Station control management: equipped with high-performance industrial computers, monitors, UPS power supplies, printers, alarm buzzer and other equipment. The monitoring system is installed on the computer to collect and display the operating status of the field equipment and display it to the user in the form of human-computer interaction. The above network instruments all use RS485 interface and MODBUS-RTU communication protocol. RS485 adopts shielded wire transmission . Generally, two wires are used to connect the wires. The connection is simple and convenient. The communication interface is half duplex communication. Both parties can receive and send data. Only data can be sent or received at the same time . The maximum data transfer rate is 10Mbps . RS48 5 interface is a balanced differential driver and receiver combination, enhanced noise immunity, allows up to 32 devices on the bus, the maximum transmission distance of 1.2km. 2 main functions of the power monitoring system 2.1 Data Acquisition and Processing Data acquisition is the basis of power distribution monitoring. Data acquisition is mainly completed by the microcomputer protection multi-function table and other equipment to achieve local real-time display of remote data. The signals that need to be collected include: three-phase voltage U, three-phase current I, frequency Hz, power P, power factor COS φ, power EPI, switch status, and remote device operation status. The data processing mainly displays the electrical parameters collected according to requirements in real time and accurately to the user, so as to meet the requirements of automation and intelligence of the power distribution monitoring, and store the collected data in the database for user query. 2.2 Human-computer interaction The system provides simple, easy to use, and good user interface. Using the full Chinese interface, the CAD graphic shows the electrical main wiring diagram of the low-voltage distribution system, shows the equipment status of the distribution system and the corresponding real-time operating parameters; the screen is dynamically refreshed in real time; the analog quantity display; the switch quantity display; and the continuous record display. 2.3 Historical events The historical event viewing interface provides convenient and friendly human-computer interaction for the user to view fault records, signal records, operation records, and over-limit records. Once you have viewed the platform through historical events, you can easily locate the user based on your own requirements and query conditions. The historical events that you want to view provide you with good software support for the overall system operation. 2.4 Database Establishment and Query It mainly completes remote measurement and remote signal acquisition, and establishes a database to generate reports regularly for users to query and print. 2.5 User Rights Management For different levels of users, different permission groups are set to prevent the losses caused by human misoperation to production and life, and to realize the safe and reliable operation of the distribution system. You can use user management to perform user login, user logout, password change, and add/delete operations to facilitate the user's modification of accounts and permissions. 2.6 Running load curve The load trend curve function is mainly responsible for regularly collecting incoming lines and important loop current and power load parameters, and automatically generating running load trend curves to facilitate users to understand the operating load status of the equipment in a timely manner. Click the corresponding button or menu item of the screen to complete the switching of the corresponding function; you can view the real-time trend curve or historical trend line; you can perform the operations such as pan, zoom, and range conversion for the selected curve to help the user to enter the trend analysis and fault recall. Analyzing the entire system's operating status provides intuitive and convenient software support. 2.7 Remote Report Query The main function of the report management program is to design the report style according to the needs of the user, and the data processed in the system is filtered, combined and statistically generated to generate the report data required by the user. This program can also be based on the needs of users of the report file to save, print or summon save, print mode. At the same time, this program also provides users with management functions for generated report files. The report has the functions of freely setting the query time to realize daily, monthly, and annual energy statistics, data export, and report printing. 3 Case Studies 3.1 Customer requirements Hitachi Jianji's 10KV substation power distribution system performs power monitoring and power management; the monitoring range is for remote real-time monitoring and power management of equipment in the 10KV high-voltage power distribution cabinet. Customer supply power distribution room power monitoring requirements table: Customer's requirements for reports: Current, voltage, power, power factor, reports for each loop, and support for historical data printing. It is required to be able to carry out production statistics, that is, the input of the output of the customer within a certain period of time. The system automatically calculates and generates the power consumed by each device. 3.2 Implementing Functions for the Project Software The multi-function electricity meter used in this project is PZ80-E4, which is an energy meter designed for the power monitoring needs of power systems, public facilities, and intelligent buildings. It can measure all conventional power parameters, such as three-phase voltage and current. , Active power, reactive power, power factor, frequency, active power, reactive power and other electrical parameters. The series of energy meter is mainly used in substation automation, distribution network automation, community power monitoring, industrial automation, energy management systems and intelligent construction and other fields. The remote signaling and telemetry alarm function mainly completes the microcomputer protection of the substation and the switch operation status and load line monitoring of the multi-function electricity meter. The pop-up alarm interface is provided for the switch displacement and load limit to indicate the specific alarm position and sound alarm. Remind people on duty to deal with it in time. The load limit can be set freely under the corresponding authority. With historical query function, as shown in Figure (2): Figure (2) Historical Telemetry Alarm Information Query The parameter reading function mainly completes the query of the electrical parameters of the incoming and outgoing circuit of the substation distribution cabinet. Supports electrical parameter query at any time, with functions such as data export and report printing. This report inquires about the electrical parameters of the loops of the substation distribution cabinets, including: three-phase voltage U, three-phase current I, frequency Hz, power P, power factor COSφ, power EPI, and switch status. The names of the loops in this report are associated with the database to facilitate the user to modify the loop names, as shown in Figure (3): Figure (3) Parameter reading The electricity consumption report function can select the time period to inquire, supports the accumulated electricity inquiry at any time, and has the functions of data export and report printing. Provide accurate and reliable power report for duty personnel. The names of the loops in this report are associated with the database to facilitate the user to modify the loop name, as shown in Figure (4): The annual, monthly, and daily report functions of electric energy mainly complete the statistics of the year, month, and day of the incoming line of the low-voltage outlet circuit, providing the on-duty personnel with intuitive, accurate and reliable annual, monthly, and daily reports, and the customer can pass certain input. The time production system can automatically calculate the production capacity and generate corresponding reports. The name of each loop of the report is associated with the database, which facilitates the user to modify the loop name, and has the functions of data export and report printing, as shown in Figure (5): Figure 5) The schematic diagram of the system communication structure mainly shows the networking structure of the system. The system adopts a hierarchical distributed structure and simultaneously monitors the communication status of the equipment at the bay level. Red indicates that the communication is normal, and green indicates a communication failure, as shown in Figure (6): Figure (6) System Communication Structure The load trend curve interface allows you to visually check the load operation of the loop. View real-time and historical trend curves, click the corresponding button or menu item to complete the switching of corresponding functions; help the user to enter the trend analysis and fault recall, with curve printing function. Provides intuitive and convenient software support for analyzing the operating status of the entire system, as shown in Figure (7): Graph (7) Trend Graph In the over-limit alarm setting interface, the customer can set the corresponding current over-limit according to the actual situation on the site. When the system detects that a certain loop exceeds the set value during system operation, the system will automatically perform an alarm to remind the on-duty personnel to find the cause and solve the problem as soon as possible. Provides intuitive and convenient software support for the safe operation of the entire system, as shown in Figure (8): Figure (8) over limit alarm setting interface 4 Conclusion With the development of society and the wide application of electricity, the power monitoring system has become an inevitable choice for large-scale multi-substation users, such as key construction projects, landmark buildings, and large-scale public facilities throughout the country. The Acrel-2000 power monitoring system introduced in this paper is introduced. The application of the Hefei Hitachi Foundation Project can realize the real-time monitoring and power management of the substation power distribution cabinet circuit power. It can not only show the power status of the circuit, but also has the network communication function, which can be composed of serial servers and computers. Power management system. The system analyzes and processes the collected data, displays the running status of each distribution circuit in the substation in real time, has a pop-up alarm dialog box and alarm sound prompts for analog sub-switching, load over-limit, and generates various electric energy reports and analyses. Curves, graphics, etc. facilitate remote meter reading and analysis and research of electric energy. The system is safe, reliable, and stable. It provides real and reliable basis for substation users to solve electricity problems and has achieved good social benefits. references: [1]. Ren Chengcheng, Zhou Zhong. Principles and Application Guide for Digital Meters for Electric Power Measurement [M]. Beijing. China Electric Power Press, 2007. 4 [2].Zhou Zhouzhong, et al. Product Selection and Solution for Smart Grid User-end Power Monitoring and Power Management System[M]. Beijing. Machinery Industry Press. 2011.10
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Figure (4) Energy Report 
