Ren Hua
Ankerui Electric Co., Ltd., Jiading, Shanghai 201801, China
Abstract: Intelligent monitoring of user-side power distribution systems for commercial users has become increasingly common. These systems are designed to install smart meters at key energy nodes on the user side and monitor the status of each energy circuit in real-time through a backend system. The system measures power, water, and gas consumption across different circuits. By continuously monitoring energy usage and related parameters, it enhances safety, reliability, and maintenance efficiency while reducing labor costs and enabling unattended monitoring of the power distribution system. Through real-time data collection and storage, the operational status of the power supply and distribution system becomes clear, offering users valuable insights to reduce maintenance costs and implement reasonable billing for property management. This article briefly introduces the ACREL-3000 power management system used in the Sinotrans Changhang Shanghai World Expo office building project, highlighting its role in achieving user-side intelligentization.
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 have long been inadequate for modern economic development and intelligent requirements. As a result, the intelligentization of power supply and distribution systems has become a fundamental requirement for commercial building owners and property management companies. Real-time monitoring of energy usage via intelligent systems allows for the accumulation and analysis of distribution system operation data, enabling effective and efficient maintenance of the power distribution system.
The ACREL-3000 power management system is specifically developed to meet these trends. It presents energy consumption and the operational status of the entire power distribution system in tabular or graphical form. Through real-time measurement, storage, and analysis of incoming and outgoing circuit energy consumption, the system provides essential data for daily management and maintenance. This article takes the Sinotrans Changhang Shanghai World Expo office building as an example to introduce the application of the ACREL-3000 power management system in the building's 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 project covers a total area of 33,035 square meters, including 10 floors of office buildings above ground and three underground levels totaling 16,843 square meters. The outer curtain wall closure was planned to be completed by the end of August 2015, with final acceptance scheduled by the end of December 2015.
In this project, a power management system was designed for the building’s distribution system. The system completes energy measurement for important circuits and provides detailed power consumption information through data sorting and processing. The ACREL-3000 system collects, stores, and processes smart meter data, presenting it in graphs and reports to help managers make informed decisions.
2 User Needs
This project primarily focuses on real-time data collection and energy reporting from protective equipment in the substation. After analyzing basic needs, the following aspects were identified:
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 display of important loop data with custom loop names;
4) Real-time display of the working status of each smart meter;
5) Drawing of the distribution diagram according to area based on actual layout;
6) Data uploading and real-time integration with third-party systems;
7) User privilege level management to support different levels of operational access.
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
Considering the scale and nature of the Sinotrans Changhang Shanghai World Expo office building and the joint development of follow-up projects, the system department of Ankerui Electric Co., Ltd. designed the intelligent power distribution system based on user needs and similar engineering experience. All monitoring points in the building are equipped with intelligent power meters that use the standard Modbus-RTU protocol. Smart meters are connected via shielded twisted pair cables, with data buses directly laid to the substation duty room where the host is located. Data is transmitted to the system host through a protocol conversion isolator.
Figure 2 communication shows...
4.2.2 Monitoring Details
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 growing demand for intelligent, transparent, and efficient building distribution systems has led to the development of corresponding solutions in the market. Currently, companies mainly install smart meters at key nodes in the power supply and distribution system, such as the entrance and exit of the substation, and use computer network integration technology to provide remote meter reading, data storage, and processing services. This helps customers monitor real-time energy usage and achieve intelligent energy management for buildings.
The Sinotrans Changhang Shanghai World Expo Office Building Energy Management System enables 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, creating a real-time data monitoring system. During the design, installation, and commissioning of the system, detailed checks and verification of the power distribution system parameters were conducted, and the power supply system was verified by checking site power parameters. The system analyzes and processes collected data, displays the power usage status of each distribution circuit in real-time, and generates various energy reports. The installation of the system facilitates the collection of various power parameters. Through data analysis and research, the management party develops appropriate energy service plans. The system is safe, reliable, and stable, solving the problem of unclear specific power consumption for end users and providing a solid basis for power system maintenance and the development of reasonable property services.
References
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