“Based on the rapid development of science and technology, people rely more and more on power resources, and the operating cost of domestic power system is relatively high at this stage, so it is imperative to improve all aspects of the power system. Power monitoring system plays an important role in the whole power system, which can effectively promote the efficiency of power grid management and reduce the operation cost of power system. This paper introduces the application of power monitoring system in the hospital through the application of power monitoring system in Anhui provincial hospital

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Distribution automation is a comprehensive information management system integrating computer technology, data transmission technology, control technology, modern equipment and management. Its purpose is to improve the reliability of power supply, improve power quality, provide users with high-quality services, reduce operating costs, reduce the labor intensity of operators.

With the continuous development of power network, the continuous growth of power load and the emergence of various new types of load, users pay more attention to power quality problems, but also put forward more stringent requirements for power quality. Users need more effective power monitoring and management solutions to meet the challenges brought by the above changes, so as to realize the continuous, reliable, efficient and low consumption operation of the distribution system. This paper introduces the application of power monitoring system in the hospital through the construction of power monitoring system in Anhui provincial hospital.

OneProject overview and construction objectives

The general ward building of Anhui provincial hospital is located at No.17 Lujiang Road, Hefei city. The whole project is divided into two phases. The total construction area of the first phase is 153200 m2, of which the building grade is grade 1; the fire protection grade is grade 1; the seismic intensity is grade 8; the civil air defense engineering grade is grade 6; the second-class personnel shelter, with the building height of 99.5m, The investment estimate of the intelligent system part of the first phase project is about 20 million yuan.

There are two substations in the project, including one 10 / 0.4kV substation and one 0.4kV substation, 21 high-voltage microcomputer protections and 432 low-voltage outgoing circuits;

In this power monitoring system, the monitoring requirements mainly include the following aspects:

1. Remote observation. The system is required to accurately detect the current, voltage, active power, reactive power, active energy, reactive energy, apparent power, power factor, frequency, switch status and other information.

2. Remote communication. The system is required to be able to transmit the equipment operation status and fault information in time.

3. Alarm. The system is required to alarm all kinds of information through setting. 4. Display. The system is required to display the operation information of each part on the spot.

TwoDesign of power monitoring system

In the design of the monitoring system, we should fully consider the actual needs of customers, the actual structure of the power system, the actual load capacity of the power system and other factors, and then reasonably select the monitoring equipment, which is not only conducive to reducing the cost of system operation, but also conducive to the realization of system functions.

The power monitoring system of this project can realize the real-time monitoring of high and low voltage distribution circuit in the building, which is conducive to power management. On the other hand, the power monitoring system can not only accurately show the power consumption of the circuit, but also has the function of network communication, which can be combined with computers, serial servers and other equipment to timely display the operation status of each distribution circuit in the building. When the load of the power system in the building exceeds the standard, the power monitoring system can quickly alarm and send out voice prompts. In addition, the power monitoring system can also generate reports, graphs and other statistical information, which is convenient for the relevant personnel to analyze the power consumption situation of each part of the building, so as to make the power consumption activities in the building safer, so as to ensure the life safety of the personnel in the building and improve the work efficiency of the office staff.

2.1 system structure

According to the distribution of distribution rooms in the hospital, the hierarchical distributed structure is adopted in the construction of power monitoring system, which includes station control management layer, network communication layer and field equipment layer. The system network structure is shown in the figure

The direct window of human-computer interaction between the station control management and the computer, which can calculate, analyze and process all kinds of data and information collected on site, and reflect the operation status of the site by means of graphics, digital display, sound, etc., is the top part of the system. It is mainly composed of system software and necessary hardware equipment, such as industrial computer, printer, UPS power supply, etc.

Two nport5630-16 data collectors are used in the communication layer. This layer is the bridge of data information exchange, which is responsible for collecting, classifying and transmitting the data information sent back by the field equipment, and at the same time, transmitting various control commands from the upper computer to the field equipment.

The field device layer is mainly connected to various types of instruments used for electrical parameter acquisition and measurement in the network, which is also a necessary basic component of the power distribution system. According to the actual characteristics of the project, the pz96-e4 / KC intelligent instrument is installed for the low-voltage distribution incoming circuit, and the pz72-e4 / KC intelligent instrument is installed for the outgoing circuit, so as to realize the monitoring of three-phase current, three-phase voltage, frequency, power, electric energy and other electrical parameters of each circuit, and monitor the opening and closing status of each circuit breaker.

2.2 network design

The network system in the power monitoring system can timely transmit the data and quickly transmit the operation instructions, which is the basis of realizing the functions of the power monitoring system. For the power monitoring system of Anhui Provincial Hospital, there are many monitoring devices in the system, and they are distributed in two distribution hours. Because of the close distance, they are directly connected to the data collector in the duty room through shielded twisted pair, and then all the data are uploaded to the background monitoring host.

2.3 software function design of monitoring system

The system is designed according to the actual needs of customers, and realizes the main functions such as primary wiring diagram interface display; electrical parameter telemetry and electrical parameter out of limit alarm; event record; system abnormal operation monitoring; fault alarm and operation record; report query and printing; system load real-time, historical curve, user rights management, etc.

The real-time monitoring system diagram of the substation is the main monitoring screen, which mainly monitors the operation status of all circuits in the substation in real time. Red represents closing and green represents opening. In the system diagram, you can directly see the operation parameters and status of each incoming line and outgoing line, and you can see all the conventional power parameters of the outgoing side of the transformer, such as: three-phase voltage, current, active power, reactive power, power factor, frequency, active power, etc. As shown in the figure below:

Primary system diagram of Substation

Remote signaling and telemetry alarm function, mainly to complete the low-voltage outlet circuit switch operation status and load line monitoring, switch displacement and load out of limit pop-up alarm interface, indicating the specific alarm position and sound alarm, remind the personnel on duty to deal with in time. The load overrun value can be set freely under the corresponding authority. It has the function of history query, as shown in the figure below:

Alarm function history query

The function of event alarm recording is mainly used to record the alarm information and the occurrence time in the query period, provide the basis for the personnel on duty and analyze the causes of the accident, as shown in the figure below:

Real time query of alarm function

Parameter meter reading function is mainly used to query the electrical parameters of low-voltage outgoing circuits. It supports the query of electric parameters at any time, and has the functions of data export and report printing. The report inquires the electrical parameters of each low-voltage circuit of transformer outgoing line in Anhui Provincial Hospital substation, mainly including three-phase current, active power and active power. The name of each circuit in the report is associated with the database, which is convenient for users to modify the circuit name. As shown in the figure below

Electric parameter reading

Power consumption report function, which can select time period for query, supports power consumption cumulative query in any time period, and has data export and report printing functions. It provides accurate and reliable electric energy report for duty personnel. The name of each circuit in the report is associated with the database, which is convenient for users to modify the circuit name. As shown in the figure below, the accurate power consumption of the power distribution circuit of the office building and the experimental building is displayed. The user can print the report directly and save it to other places in Excel format. As shown in the figure below:

Electric energy report

The schematic diagram of system communication structure mainly shows the network structure of the system. The system adopts a hierarchical distributed structure and monitors the communication status of the Bay layer equipment at the same time. Red indicates normal communication and green indicates communication failure. The figure below shows the communication status of substation.

Schematic diagram of communication structure

In the load trend curve interface, you can directly view the load operation of the circuit. View the real-time and historical trend curve, click the corresponding button or menu item on the screen to complete the corresponding function switching; help the user to analyze the incoming trend and recall the fault, with curve printing function. It provides intuitive and convenient software support for analyzing the operation of the whole system. As shown in the figure below:

Trend curve

ThreeThe significance of applying power monitoring system in power supply and distribution design

To sum up, the power monitoring system can help the power users improve efficiency, reduce losses and reduce operating costs. The power monitoring system can effectively ensure the efficiency of power grid management and reduce power operating costs, which has become an indispensable part of power supply and distribution design. The functions of power monitoring system, such as communication, fault alarm, data storage and recording, make it more convenient for the staff in the actual work, Because the data transmission of monitoring equipment is realized through network transmission, different power monitoring systems can design different networking methods to ensure the rapid and accurate transmission of data information. On the other hand, in the design of power supply and distribution, we should choose the monitoring equipment according to the actual situation. The general power monitoring system usually uses the equipment with the functions of remote communication, remote observation and remote control, while some high-end power monitoring systems need to choose intelligent equipment with more complete functions.

Setting up power monitoring system in business building, office building, school, hospital and other places can realize real-time monitoring of high and low voltage distribution circuit in the building, which is conducive to power management. On the other hand, the power monitoring system can not only accurately show the power consumption of the circuit, but also has the function of network communication, which can be combined with computers, serial servers and other equipment to timely display the operation status of each distribution circuit in the building. When the load of the power system in the building exceeds the standard, the power monitoring system can quickly alarm and send out voice prompts. In addition, the power monitoring system can also generate reports, graphs and other statistical information, which is convenient for the relevant personnel to analyze the power consumption situation of each part of the building, so as to make the power consumption activities in the building safer, so as to ensure the life safety of the personnel in the building and improve the work efficiency of the office staff.

reference

[1] Principle and Application guide of electric power digital instrument, Ren Zhicheng, Zhou Zhong, China Electric Power Press

[2] Application of power monitoring system in power supply and distribution design, Gao Shihong, science and technology wind

[3] Application of power monitoring in 10kV power supply and distribution design, Yao Qiang, science and technology world

About the author:

Wu Haiying, female, bachelor degree, ankerui Electric Co., Ltd. her main research direction is intelligent power monitoring and power management system.

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