Keywords: power monitoring software; four remote units; timely alarm; application
0 Overview At present, many domestic building power distribution still use box-type substations with low-voltage cable tap boxes to achieve decentralized power supply, which brings a lot of inconvenience to the operation and management of the entire system. Computer technology and network communication technology are becoming more mature. Intelligent and networked functions such as system measurement and control are inevitable trends, and various problems in the operation of the power distribution system can be fully solved by microcomputers.
The intelligent power distribution system is composed of switches and intelligent components with communication functions connected to the computer system network through digital communication to realize the automatic management of the operation of the switch equipment in the distributed low-voltage cable distribution box. The system can realize the functions of real-time data collection, digital communication and program control, and equipment maintenance information management.
This article takes the power monitoring system of the First Hospital of Harbin Medical University as an example to briefly introduce the intelligent management of the following substations.
1 System analysis The First Affiliated Hospital of Harbin Medical University was founded in 1949. It is a large-scale comprehensive tertiary Grade A hospital integrating medical treatment, teaching and scientific research. As the largest medical center in Heilongjiang province, the medical specialties are fully equipped and the technical force is strong. The hospital has business departments such as outpatient department, inpatient department, emergency department, remote consultation center and so on. There are 87 clinical departments, 24 medical technology departments, and 3,524 open beds. In 2009, there were 1.64 million outpatient and emergency visits, 118,000 discharges, and nearly 58,000 surgeries. The hospital also undertakes the health care and diagnosis tasks of deputy provincial and above leaders and important foreign guests.
The Harbin Medical University First Hospital's power monitoring system project is a project that began in July 2010. It aims to realize the Harbin Medical University First Hospital's fault alarm detection, realize remote and precise timeliness, and avoid medical accidents caused by power outages.
Before the project starts, the buyer needs to provide the primary system diagram, floor plan, secondary system diagram, etc. of the power distribution system for the seller's design reference. The seller completes the design of the system according to the actual needs of the buyer and the functions of the intelligent components. The main functions are: primary interface display of the main wiring diagram; electrical parameter telemetry; event recording, system operation abnormal monitoring; fault alarm and operation record; energy report query And printing; system load and other main functions, the actual refinement function seller can make feasibility modifications according to the buyer's usage habits and needs.
The entire system adopts a network distributed structure, and the monitoring host is located in the power center of the report hall and the underground floor of the surgical building. The project realized remote and precise alarms in 2 buildings of the First Hospital of Harbin Medical University. The design plan is 2 power distribution rooms in 2 buildings, the instrument data is transmitted through the 485 interface, and the MODBUS communication protocol is transmitted to the host of the duty room through the data collector.
2 System structure
This system uses a layered distributed computer network structure, that is, station control management layer, network communication layer and field equipment layer.
The field equipment is: PZ series multi-function network power meter and ARTU four remote unit. These devices are respectively installed in the electrical cabinet, through the RS485 communication interface, through the on-site MODBUS bus network communication, to achieve on-site data collection.
The equipment of the network communication layer is: a communication server, whose main function is to centrally collect the distributed collection devices at the same time, and transmit them to the station control management layer at the same time to complete the data interaction between the field layer and the station control layer.
The equipment of station control management layer is: high-performance industrial computer, monitor, UPS power supply, printer, alarm buzzer 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. RS485 uses shielded twisted pair transmission, the wiring is simple and convenient; the communication interface is half-duplex communication, and the maximum data transmission rate is 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.
3 Acrel-3000 power monitoring configuration software solution
Acrel-3000 power monitoring configuration software is a special software for collecting and process control of on-site production data. The biggest feature is that it can be used for flexible and diverse "configuration mode" instead of programming mode for system integration, which provides a good The user development interface and simple engineering implementation method, as long as the various software modules preset by it are simply "configured", you can easily implement and complete the functions of the monitoring layer, such as in distributed network applications All applications (such as trend curves, alarms, etc.) refer to remote data in exactly the same way as local data. The "configuration" method can shorten the time of automation engineers' system integration and improve integration efficiency.
After the implementation of the system, a system diagram display of various types of electrical equipment was realized, the energy report of the incoming circuit, and the load electricity trend of the incoming circuit, the opening and closing power failure alarm of all circuits, and the graphs are shown in Figure 1, respectively. 2, 3, 4.
Figure 1 System once diagram
System primary diagram: intuitively displays the status of each circuit of the low-voltage system. When the power is turned off or closed, the green knife gate on the primary diagram will automatically change to red and a prompt box will pop up with an audible alarm.
Figure 2 Real-time electrical parameters
Real-time electrical parameters: query, print and export three-phase current, voltage, power, frequency, energy data of low-voltage circuits.
Figure 3 Alarm query
Alarm information of opening and closing: remote signal alarm of opening and closing of each important circuit, real-time alarm and historical alarm query.
Figure 4 pop-up prompt box
Pop-up prompt box: The pop-up prompt box can display the loop name and the cause of the fault alarm.
System features: fewer communication line contacts, intuitive screen display, fast data refresh, and timely response to the operating status of field devices. At the same time, the system is simple to operate and convenient for users to use. Various functions can be flexibly changed according to user needs. The design of the system is quick and convenient. Modifying the software is also not cumbersome.
4 Conclusion The configuration of network power meters in the power monitoring system has the obvious advantages of concise implementation and low investment. It can easily and real-time monitor the operation status of the distribution system, and manage the electrical equipment on site in a unified manner, eliminating the need for staff to On-site recording of tedious work, the system manages and analyzes the historical operating data and status of various electrical equipment, which is convenient for maintenance personnel to clarify the equipment status, formulate a detailed equipment maintenance plan, reduce staff, and improve efficiency. At the same time, based on the established electricity metering system, you can understand and analyze the overall energy consumption of buildings, propose a reduction plan, take energy-saving and reduction measures, and gradually improve the efficiency of electricity consumption.
references
[1] "Principle and Application Guide of Digital Instruments for Electric Power Measurement", Ren Zhicheng, Zhou Zhong, China Electric Power Press
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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