Keywords: Sheraton Wenzhou Hotel, intelligent instrument, switch acquisition, Acrel-2000 power distribution monitoring system
0 Overview The Sheraton Wenzhou Hotel was formerly known as the Wenzhou Jinxiu Holiday Hotel. It was jointly constructed by the Wenzhou Jinxiu Hotel Investment Company and the Starwood Group. The direct investment amount was over 300 million yuan. Sheraton Wenzhou Hotel is located at the intersection of Wenzhou Railway Station Avenue and Jinxiu Road, in the central area of ​​Wenzhou City. It is the second high-five-star hotel in Wenzhou, covering an area of ​​7,600 square meters and a total construction area of ​​about 46,000 square meters. It is mainly composed of a two-story basement, a 25-story main building and a 5-story podium. The design of the distribution monitoring system of the Sheraton Wenzhou Hotel is undertaken by Shanghai Ankerui Electric Co., Ltd. as part of its building automatic control system. The monitoring range of the distribution monitoring system covers the power installed on all high and low voltage switch cabinets in the distribution room Instrumentation, 4 transformer temperature and humidity controllers and emergency generators.
The Sheraton Wenzhou Hotel has two distribution rooms, one large and one small. They are located on the 3rd floor of the podium, and the emergency generator is located on the second floor of the podium. 6 ABB REX521 microcomputer protection devices within the monitoring range of the power distribution monitoring system, 7 ACREL ACR320EK network power meters, 128 ACREL PZ96-E4 programmable intelligent meters and 4 LD-B10 transformer temperature and humidity controllers are distributed in two Power distribution room. The British deep sea 5220 emergency generator is located in the generator room on the second floor underground of the podium. Its operation data is collected by the 555 control module and uploaded to the upper monitoring host.
1 System composition
The ACREL-2000 type distribution monitoring system adopts a hierarchical distributed structure.
The main equipment at the field equipment level are: multi-function network power meter, microcomputer protection device, transformer temperature and humidity controller, and emergency diesel generator control module 555. These devices correspond to the corresponding primary equipment or are installed in the electrical cabinet or installed on the equipment cabinet. All adopt RS485 communication interface, and perform network communication through on-site shielded twisted pair to realize on-site data collection.
The communication control layer is mainly: a communication server, whose main function is to centrally collect data scattered on the field acquisition device, and after the conversion of the data transmission protocol (convert RS485 to RS232) to the monitoring host of the station control layer, complete the field layer and station Data interaction between control layers.
Station control management: equipped with high-performance industrial computers, monitors, UPS power supplies, printers and other equipment. The monitoring system is installed on the computer, collects and displays the running status of the field equipment in a centralized manner, and displays it to the user in the form of human-computer interaction.
The above network instruments all use RS485 interface and MODBUS-RTU communication protocol on site. The communication interface is half-duplex communication, that is, both sides of the communication can receive and send data but can only send or receive data at the same time, the highest data transmission rate 10Mbps. The RS-485 interface is a combination of a balanced driver and a differential receiver, which enhances the ability to resist noise interference. Up to 32 devices can be connected to the bus, and the maximum transmission distance is 1.2km.
2 System functions
2.1 Data collection and processing Data collection is the foundation of power distribution monitoring. Data collection is mainly completed by on-site measurement and control layer instrument collection 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 COSφ, electrical Ep, remote equipment operating status and other data.
Data processing is mainly to display the electrical parameters collected according to the requirements to users in real time and accurately, so as to meet the requirements of automation and intelligence of power distribution monitoring.
2.2 Database establishment and querying mainly completes the remote measurement and remote signal collection at regular intervals, and establishes a database, and stores the collected real-time data into the database at regular intervals for customers to inquire according to time.
2.3 Historical data and real-time data output When customers query data, they can choose to output the report as an excel file or directly print it for archiving.
2.4 Fault alarm and accident recall When the power distribution system fails, the power monitoring system will give an audible and visual alarm within 0.3 seconds to prompt the user to respond to the fault circuit in time, and automatically record the time and place of the event for the user to query and recall the fault the reason.
2.5 Operating load curve Collect the incoming load and important loop current load parameters at regular intervals, and automatically generate the operating load trend curve, which is convenient for users to understand the real-time and historical operating load conditions of the equipment.
2.6 Network access The power distribution monitoring system can be accessed remotely through the IE browser, which is convenient for the hotel management company to view and process the power distribution system operating data outside the central monitoring room.
2.7 User authority management For different levels of users, set different authority groups to prevent losses caused by human misoperation to hotel operation management, and to achieve safe and reliable operation of the power distribution system.
2.8 Running interface
The figure above shows the operation of the 10KV distribution circuit;
The picture above shows the real-time temperature of the transformer;
The picture above shows real-time alarm information;
Automatically generated electrical parameter reports;
System load curve.
3 Project analysis The monitoring host of this system is placed in the monitoring center on the ground floor of the podium, juxtaposed with the elimination control and security system. In addition to local monitoring, authorized users can also access remotely through the LAN of the hotel management company.
The user's main requirement is to monitor the immediate operation status of the power distribution system, requiring low-latency acquisition of three-phase voltage U, three-phase current I, frequency Hz, active power P, reactive power Q, power factor COSφ, active wattage Epi, remote Data such as equipment operating status. At the same time, it also pays more attention to the power consumption of the 5th floor banquet hall and guest room power supply of the main building. In order to ensure the real-time nature of data collection, the number of instruments connected to each RS485 bus should not exceed 20 as the basic principle.
The switching state quantities (opening and closing, grounding knife, etc.) of the 10KV loop are directly collected from the ABB comprehensive protection. The detection function of the opening and closing signal and fault signal of the 0.4KV circuit is an additional function. It uses a shielded four-core wire to connect to the passive dry contact reserved by the electrical package manufacturer, and is collected and passed by the ACREL ARTU-K32 multi-circuit switch monitoring device RS485 field bus upload.
On the basis of the completion of the above functions, according to the user's needs, use a pin-type printer to automatically print out the power distribution mains report of the main building every 4 hours, and automatically print the electricity consumption report of the room floor at the end of each month, further simplifying the operation of the duty officer Avoid hotel management problems caused by misuse.
4 Conclusion With the development of society and the widespread application of electricity, the automatic management of distribution system has become an inevitable choice for large public buildings. The application of power meters and ACREL2000 power monitoring system introduced in this article in the distribution of Sheraton Wenzhou Hotel can achieve The real-time monitoring of the accessory system can not only display the power consumption status, but also have network communication functions. It can form a power monitoring and energy consumption management system with the BA (building automatic control) system. The system realizes the analysis and processing of the collected data, and can generate various reports, analysis curves and graphics with one click, which is convenient for remote meter reading, analysis and research. The system runs reliably and stably, and is compatible with the electrical equipment of various companies at home and abroad (such as ABB Company, British Deep Sea Company, etc.). It has been successfully applied in many large-scale public buildings and has achieved good economic and social benefits.
references
Edited by Ren Zhicheng and Zhou Zhong, Principles and Application Guide of Electric Power Measurement Digital Meters, China Electric Power Press, 2007.4
About the Author:
Yu Jing, female, undergraduate, engineer of Wuhan Ankerui Electric Co., Ltd., the main research direction is intelligent power monitoring and power management system
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