Ren Hua
Ankerui Electric Co., Ltd., Jiading, Shanghai 201801, China
Abstract: Intelligent monitoring of user-side power distribution systems has become increasingly common in commercial settings. This system involves the installation of smart meters at key energy nodes on the user side, enabling real-time monitoring of each energy circuit through a back-end platform. It measures electricity, water, and gas consumption for each circuit. By continuously tracking energy usage and related parameters, it enhances safety, reliability, and maintenance efficiency, reduces labor costs, and supports unattended monitoring of the power distribution system. Real-time data collection and storage clarify the operational status of the system, helping users save on maintenance costs and manage property charges more effectively. The ACREL-3000 power management system used in the Sinotrans Changhang Shanghai World Expo office building project is briefly introduced here.
Keywords: Sinotrans, Changhang, Shanghai World Expo, office building, power monitoring, unattended, intelligent distribution system, distribution automation
0 Introduction
In commercial power distribution systems, traditional manual meter reading and system maintenance can no longer meet modern economic development needs or the requirements for intelligent configuration. As a result, the intelligentization of power supply and distribution systems has become essential for commercial building owners and property management companies. Using an intelligent system to monitor user-side energy in real time allows for the accumulation and analysis of distribution system data, leading to effective and reasonable maintenance of the power distribution system.
The ACREL-3000 power management system was developed to address these trends. It displays energy consumption and the operational status of the entire power distribution system using tables or graphs, and quantifies the system's performance through real-time measurement, storage, and analysis of incoming and outgoing circuit energy data from the substation of the Shanghai World Expo Office Building. This provides data support for daily management and maintenance by the administrators.
This article takes the Sinotrans Shanghai World Expo office building as an example to introduce the application of the ACREL-3000 power management system in its distribution system.
1 Project Introduction
The Sinotrans Changhang Group Expo project is located in Zone B of the Expo Site. Construction began on December 11, 2012. The site covers 5,295 square meters, with a total construction area of 33,035 square meters, including 10 floors of above-ground office space and three levels of underground buildings totaling 16,843 square meters. The exterior curtain wall was completed by the end of August 2015, and the final acceptance was completed by the end of December 2015.
In this project, a power management system was designed for the floor’s distribution system. Through system implementation, the energy measurement of important circuits in the office building was completed. The current measurement range includes energy metering for the incoming loop in the floor substation. The ACREL-3000 power management system collects, stores, and processes smart meter data, presenting it in graphical and report formats to provide management personnel with detailed power consumption information.
2 User Needs
In this project, the main focus is on real-time data collection, energy reporting, and display of comprehensive protection equipment in the substation. After analyzing the basic needs, they are categorized into the following aspects:
1) Real-time data acquisition and display of the incoming circuit of the power distribution cabinet on each floor;
2) Energy collection and metering of each incoming circuit;
3) Real-time data display of important loops with customizable loop names;
4) Real-time display of the working status of each smart meter;
5) Drawing of the distribution diagram according to the area based on the actual distribution structure;
6) Data collection, real-time integration, and sharing with third-party systems;
7) User privilege level management, allowing different operations based on access levels.
3 Design
3.1 Reference Standards
The system is designed to meet the following manufacturing and testing standards:
JGJ/T16-92 "Electrical Design Code for Civil Buildings"
GB/J63-90 "Design Specification for Electrical Measuring Instruments for Electrical Installations"
GB/T13730 "General technical conditions for regional grid data acquisition and monitoring systems"
GB2887 "Technical Requirements for Computing Station Sites"
GB/50198-94 "Technical Specifications for Monitoring System Engineering"
DL/T698.31-2010 Part 3.1: Technical Specifications for Power Information Collection Terminals - General Requirements
DL/T698.35-2010 Part 3-5: Technical specification for power information collection terminal - Particular requirements for low-voltage centralized meter reading terminal
DL/T698.41-2010 Part 4-1: Communication Protocol - Communication between the primary station and the energy information collection terminal
DL/T698.42-2010 "Part 4-2: Communication Protocol - Concentrator Downlink Communication Protocol"
DL/T/814-2002 "Functional Automation System Functional Specifications"
3.2 System Architecture Design
Based on the scale and nature of the Sinotrans Changhang Shanghai World Expo office building and the follow-up joint development projects, Ankerui Electric Co., Ltd. designed the intelligent power distribution system as follows: All monitoring points of the Shanghai World Expo Office Building have been equipped with intelligent power meters that use the standard Modbus-RTU protocol. Smart meters installed on-site are connected via shielded twisted pair cables, and the data bus is directly laid to the substation duty room where the host is located. Data is transmitted to the system host through a protocol conversion isolator. A system diagram is shown.
Figure 2 Communication shows
4.2.2 Monitoring Details
The monitoring details reflect the name of the entire system distribution circuit, the corresponding distribution system, and the main electrical parameters of the circuit. Through the display of real-time data, the operation data of each monitoring loop of the project is visually reflected, which is convenient for the manager to know the running status of the system in real time. The interface is shown in Figure 3.
Figure 3 Monitoring Details
4.2.3 Parameter Reading
The parameter report reflects the operational data of the monitoring loop of the project at a certain point in time, and the real-time parametric data at a current or past time point reflects the loop status. The main data includes: three-phase voltage, three-phase current, electric energy, active power, reactive power, power compensation factor, frequency. The interface is shown in Figure 4.
Figure 4 Parameter Reading
4.2.4 Energy Report
The energy report is the management of the power consumption in the form of a report. The report can realize the functions of monthly meter reading, daily meter reading, hour meter reading, etc., and can be exported or printed in Excel at any time during the system operation. The interface is shown in Figure 5.
Figure 5 Energy Report
5 Conclusion
The intelligent, transparent, and high-efficiency requirements of the building distribution system have driven the market to offer corresponding solutions. Currently, the company mainly installs smart meters in the power supply and distribution system of the building, i.e., at the entrance and exit nodes of the substation, and uses computer network integration technology to provide customers with remote meter reading, data storage, and data processing services to help them monitor the real-time energy status of the building and achieve intelligent management of building energy.
The Sinotrans Changhang Shanghai World Expo Office Building Energy Management System realizes real-time collection, storage, display, and export of power distribution system data. A smart meter is installed at an important node of the power distribution system, thus establishing a real-time data monitoring system. During the system design, installation, and commissioning, the parameters of the power distribution system were also carefully checked and verified; the verification of the power supply system was carried out by checking the power parameters of the site. The system analyzes and processes the collected data, displays the power usage status of each distribution circuit of the owner in real time, and generates various energy reports. The installation of the system facilitates the collection of various power parameters. Through the analysis and research of the data, the management party formulates the corresponding energy service plan. The system is safe, reliable, and stable. It also solves the problem of unclear specific power consumption of each distribution circuit for the end users of the distribution system, and provides a real and reliable basis for the maintenance of the power system and the development of reasonable property services.
References
[1]. Ren Zhicheng Zhou Zhong. Principles and Application Guidelines of Digital Meters for Electric Power Measurement [M]. Beijing. China Electric Power Press. 2007.4
[2]. Zhou Zhong. Application of power meter in electric energy metering of large commercial hotels [J]. Modern Building Electric 2010.6
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