Application of Power Management System in Wusong Central Hospital
1. Project Introduction Wusong Central Hospital was founded in 1934. The hospital covers an area of ​​42 acres, with a construction area of ​​21,500 square meters and a green area of ​​6623 square meters. There are 402 approved beds in the hospital, and 524 beds are actually opened. There are 804 staff members and 668 technicians, including 47 senior titles and 132 intermediate titles. There are 25 clinical medicine departments (including Chinese medicine for Shanghai demonstration Chinese medicine) and 36 second-level departments. 
In order to strengthen the scientific management of hospital electricity and the technical transformation of electrical equipment and improve the utilization rate of electric energy, Wusong Central Hospital needs to design a power management system. The monitoring scope of this project is: the operation of smart meters in the substation of Wusong Central Hospital Parameters, Wusong Central Hospital has a substation. There are 2 transformers (1# transformer, 2# transformer) outlet and 93 ordinary feeders in the substation.
Shanghai Ankerui Electric Co., Ltd. undertook the system integration work of Wusong Hospital in October 2012, and selected our ACREL-3000 power management system according to the actual situation of Wusong Hospital.
The incoming circuit uses ACR220ELH multi-function harmonic instrument, which is a network power meter designed for power monitoring needs of power systems, industrial and mining enterprises, public facilities, and intelligent buildings. It can measure all conventional power parameters, such as three-phase voltage, Current, active power, reactive power, power factor, frequency, active power, reactive power, and can monitor a variety of electrical parameters such as 2-31 harmonic components of voltage and current. And the instrument has 4 photoelectric isolation switch input contacts and 2 relay control output contacts, these contacts can be used with the intelligent circuit breaker to realize the remote signaling and remote operation of the circuit breaker. This series of network power meters are mainly used in substation automation, distribution network automation, residential power management, industrial automation, energy management systems and intelligent buildings. The common feeder circuit adopts PZ96L-E4/C intelligent programmable power meter, which mainly measures all conventional power parameters, such as: three-phase voltage, current, active power, reactive power, power factor, frequency, active power, no Power and electricity.
2. System design scheme 2.1 Design standard GB2887-2000 "Technical Requirements for Computing Station Sites" GB/T13729-2002 "General Technical Conditions for Telecontrol Terminals" DL478-2001 "General Technical Conditions for Static Relay Protection and Safety Automatic Devices" DL/T400-2010 Technical Specification for Relays and Safety Automatic Devices DL/T 814-2002 "Functional Automation System Functional Specification" DL/T634-2002 "Remote equipment and system transmission protocol basic telecontrol task supporting standard" DL/T721-2000 "Distribution network automation system remote terminal" DL/T770-2001 "Microcomputer transformer protection device general technical conditions" GB/T50063-2008 Design Specification for Electrical Measuring Instrumentation of Electric Power Equipment GB-14285-2006 "Technical Regulations for Relay Protection and Safety Automatic Devices" GBJ232-2002 "Code for Acceptance of Construction Electrical Engineering Quality" GB/T15145-2001 General Technical Conditions for Microcomputer Line Protection Devices GB50171-2006 "Code for Construction and Acceptance of Installation Work Disks, Cabinets and Secondary Circuits of Electrical Installations" GB/50198-2011 "Monitoring System Engineering Technical Specification" GB/T17626.5 Surge (Impact) Immunity Test DL/T5003-2005 "Technical Regulations for Power System Dispatching Automation Design" 2.2 System Target Design Enterprise power management system is a power management ERP system built for enterprises by using IoT technology and smart grid concept combined with modern power demand side power management ideas. The goal is to enable enterprises to scientifically manage electrical energy through the power management system to achieve the goal of "safe, reliable, economical, efficient, clean" and the "four modernizations" of power management.
1. Realize the visualization of power management. To realize the visual management of the intangible, colorless and odorless cost of electricity and electric energy through sensing technology, let us: see the movement of electric energy, where to buy electricity from the grid company: see the quality of electric energy, use What is the quality of power, which equipment is emitting electricity pollution; seeing the waste of electrical energy, standby power, auxiliary power, transformer loss, line loss; seeing the danger of electric energy, which equipment is hot, which equipment has safety hazards, Which equipment has abnormal power consumption indicators; seeing the increase in electricity bills, the daily electricity bill and accumulated electricity bills on each floor, dynamically seeing that the cost of the enterprise is lost with the loss of time; 2. Realizing the digitalization of power management. The electric hard tube is people who are unfamiliar with it, the electricity is good, the electricity is good, the tube is not good, the saving and the waste are used. If you don’t use no specific standards and scales, you must quantify the electricity, electricity, and electricity. The goal of digitization is to talk with more power and less power; to talk about national standards in terms of power quality; to save waste and to talk about running energy indicators; to save waste and to talk about product consumption; to safely and reliably use the percentage of electricity anomalies and faults; 3. Realize the specialization of power management. Another reason for electric hardship is sometimes professional, and people have little knowledge of it and long-term monopoly. There is no enterprise talent, no technology, no bottleneck in capital, and it is not its main business. The goal of specializing in electric energy is to have a team that manages its own electricity like a grid company; it has its own technology to manage electricity like a grid company; it has its own modern equipment like a grid company; it operates and maintains its own like a grid company. Distribution system and electrical equipment; more professional management of their own electrical equipment than the grid company; 4, to achieve power management network. The reason why the electric tube is difficult is that it has strong real-time performance, wide distribution, high risk, and boring. What we need to do is that we can manage electricity as long as there is Internet.
2.3 System Structure The Acrel-3000 power management system adopts a layered and distributed structure, namely the field device layer, the network communication layer, and the station control management layer. The system topology diagram is shown in the following figure (1):
The whole station management and management part of the power management system includes monitoring and management host, printer, UPS power supply, etc.; the network communication layer part includes a 16-port serial port server; the on-site smart instrument monitoring equipment layer is composed of ACR220ELH and PZ96L-E4. The power distribution system is distributed in a substation. All power meters of the two transformers are connected to the serial port server through the RS485 bus, and are uploaded to the monitoring background through the super five types of network cables.
The data collected by the power distribution system is mainly the operating parameters of the power circuits of the various loops of the ACR network multi-function meter and the PZ programmable intelligent electric meter, including the telemetry information such as current, voltage and power, and the closing and closing status of the circuit breaker and the protection information. Faults; the field device uploads the collected and processed signals to the communication management machine via the shielded twisted pair cable, and uploads them to the station management layer via the Super Category 5 line. ACR220ELH, PZ96L-E4 network multi-function instrument adopts RS485 interface and MODBUS-RTU communication protocol, RS485 adopts shielded wire twisted pair transmission, the wiring is simple and convenient; the communication interface is half-duplex communication, the maximum data transmission rate is 10Mbps.RS-485 The interface is a combination of balanced driver and differential receiver. The anti-noise ability is enhanced. Up to 32 devices can be connected on the bus, and the maximum transmission distance is 1.2km.
The entire power distribution system is based on the computer station control management system, using modern communication technology to uniformly manage the power consumption status of the entire power distribution system, real-time monitoring the power consumption of each link and each type of equipment; real-time monitoring and supervision of electric energy Quality, timely detection of power failures, avoiding waste of electricity.
2.4 Main Implementation Functions of the System 2.4.1 User Rights Management For different levels of users, different permissions are set to facilitate different operations of different authorized management personnel to achieve safe and reliable operation of the power distribution system. User management allows user login, user logout, password modification, and deletion to facilitate user modification of accounts and permissions.
2.4.2 System main interface
The system provides a simple, easy to use, and good user interface. Using the full Chinese interface, the CAD graphic shows the electrical main wiring diagram of the power distribution system, showing the status of the power distribution system equipment and the corresponding real-time operating parameters, the screen timing wheel patrol switching; the screen real-time dynamic refresh; analog quantity display; switch quantity display; continuous recording Display, etc., through the change of the color of the screen (red indicates the closing state, green indicates the opening state), the opening and closing state of each loop can be seen.
Log in to the ordinary privileged user. Through the operation of the main interface, you can view the electrical parameters (current, voltage, active, reactive, power factor, and electrical) of each loop. Login to the highest privileged user can realize the internal electrical report and current of the system. Curve and alarm information printing and export functions.
2.4.3 Trend curve analysis
The Acrel-3000 Power Management System provides an analysis interface for both real-time curves and historical trends. The current load behavior of the loop is analyzed by calling the relevant loop real-time curve interface. For example, by calling a real-time curve of a distribution loop, the signal fluctuation caused by the electrical equipment of the loop can be analyzed. The historical trend of the system is that the system can view the historical trend of all stored data, which is convenient for engineers to analyze the quality of the monitored distribution network.
2.4.4 Report Statistics
The electric energy report in the Wusong Central Hospital system is 1# transformer and its circuit report and 2# transformer and its loop report, which is convenient for the administrator to view and analyze. At the same time, the system collects the active energy data and automatically generates the report according to the different loop names. And there is a report printing function, which can query and print the electricity consumption in a certain period of time of any loop. These reports all support Excel export function.
2.4.5 Alarm function Remote signal and telemetry alarm function, mainly complete the switch operation status and load line monitoring of the low-voltage outlet circuits. The switch position and load limit alarm pop-up alarm interface indicates the specific alarm position and audible alarm, reminder on duty The personnel deal with it in time. The telemetry alarm value setting interface can see the real-time value and alarm setting value of each monitoring point, which is convenient for the on-duty personnel to compare the incoming line settings. The load limit value can be freely set under the corresponding authority. With historical query function.
3. Operational effect 3.1 Benefit analysis The benefits brought by power management to customers are mainly reflected in three aspects: 1. Direct benefits refer to the benefits brought about by reducing the cost of electricity, which is what we usually talk about to save money. The benefits of this part generally range from 1-30% of the annual telegraph fee, mainly determined by the size, nature and current management level of the company.
2. Indirect benefits refer to the benefits of power management, equipment management, and production management through power management services. The benefits of this part are real, but difficult to measure by value. Such as: scientific implementation of orderly use of electricity, reducing the maximum load demand, the peak of power consumption is not affected by the power cut; the discovery of power pollution sources and pollution properties, to provide a basis for scientific management of power pollution; It is convenient, fast and accurate; it has established and improved the power distribution equipment, electrical equipment file management system and equipment operation management system, so that the company does not cause the loss caused by the loss of distribution system data and drawings due to personnel renewal; And the professional team of the management of electricity; management of production operations through changes in electrical energy consumption and power indicators, etc.; these indirect benefits, for customers, may be more valuable than direct benefits.
3. Social benefits refer to the benefits brought by energy conservation and emission reduction through energy management services. Mainly reflected in the following aspects: reducing the maximum load of the enterprise by 10%, making the power plant less power generation; achieving orderly power consumption at the equipment level, scientifically responding to the peak of power consumption; building energy efficiency power plants at the user level, etc.; With the wide application of development and power, intelligent power management system has become an inevitable choice for large-scale public construction. The application of electric instrument and Acrel-3000 power management system in Wusong Central Hospital project can realize remote telemetry and remote signaling. The on-site electrical parameters are displayed to facilitate the on-duty personnel to view; the setting of the fixed value modification function for the advanced users also improves the safety factor of the operation of the on-duty personnel; at the same time, the system realizes the analysis and processing of the collected data, and generates various energy reports, Analyze curves, bar graphs, etc., to facilitate remote meter reading and analysis and research of electric energy; the pop-up of the alarm window helps to remind the on-duty personnel to check the operation status of the field equipment in time.
The Acrel-3000 power management system used in the project was officially put into operation at the end of January 2013. The whole system is stable and safe, which greatly facilitates the use of users and provides a large amount of real-time and accurate energy data for managers. The internal measurement assessment provides a basis for further energy conservation management and implementation of energy conservation measures.
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