Power monitoring system in Jiashan Wanlian City - Database & Sql Blog Articles

Ren Hua

Abstract: Based on the rapid development of science and technology, people rely more and more on power resources. At present, the operating costs of domestic power systems are relatively high. Therefore, it is imperative to improve all aspects of power systems. The power monitoring system plays an important role in the entire power system. It can effectively promote the efficiency of power grid management and reduce the operating cost of the power system. This paper introduces the power monitoring system in the commercial complex through the application of Jiashan Wanliancheng Power Monitoring System. Applications.

Keywords: power system; data acquisition; commercial complex ; monitoring system

0 Preface

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 power supply reliability, improve power quality, provide quality services to users, reduce operating costs, and reduce the labor intensity of operators.

With the continuous development of power networks, the continuous increase of power load, various new types of loads continue to emerge, users pay more attention to power quality issues, but also put more stringent requirements on power quality. Users need more effective power monitoring and management solutions to meet the challenges of these changes in order to achieve continuous, reliable, efficient and low-cost operation of the distribution system. This paper introduces the application of power monitoring system in commercial complex through the construction of Jiashan Wanlian City power monitoring.

1 Project overview and construction goals

Jiashan Wanlian City is built by Wanlian Real Estate. The project covers an area of ​​208 acres and has a total construction area of ​​570,000 square meters. It consists of Wanlian Shopping Center, Wanlian Plaza and Wanlian Garden. It integrates large-scale fashion department stores, large-scale integrated supermarkets, five-star cinemas, food courts, amusement centers, business hotels, Grade A office buildings, and boutique garden residences. It is a city center that fully contributes to urban development.

The whole project includes two parts of the east and west districts. The 10kV distribution system of the western district adopts two-way incoming line, single busbar section connection, two-circuit power supply one master and one standby, 0.4kV power distribution system main supply 7200kVA, ready for 1600kVA, set 2000kVA Two dry-type transformers and two 1600kVA dry-type transformers (one of which is also used as spare); the east 10kV power distribution system adopts two-circuit incoming line, single-bus line segment connection, and two-loop power supply one master and one standby. The main capacity of the power distribution room is 8500kVA, which is available for 2000kVA, with three sets of 2000kVA dry-type transformers (one of which is also used as spare) and two sets of 1250kVA dry-type transformers.

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

1. Remote monitoring. The system is required to accurately monitor information such as current, voltage, active power, reactive power, active energy, reactive energy, apparent power, power factor, frequency, switching state, and residual current. 2. Remote communication. The system is required to transmit the equipment operating status and fault information in a timely manner. 3. Alarm. The system is required to be able to alert various information through settings. 4. Display. The system is required to display the operational information of each part in situ.

2 Design of power monitoring system

In the design of the monitoring system, it is necessary to fully consider the actual needs of the customer, as well as the actual structure of the power system, the actual load capacity of the power system, etc., and then rationally select the monitoring equipment, which is beneficial to reduce the cost of the system operation, and also Conducive to the realization of system functions. The power monitoring system of the project sets up a set of power monitoring systems in the east and west areas to realize real-time monitoring of the high and low voltage distribution circuits in the Wandong City East and West District, which is conducive to power management. On the other hand, the power monitoring system can not only accurately indicate the power consumption status of the circuit, but also has the functions of network communication, etc., and can be combined with computers, serial servers and other devices to display the operation status of each power distribution circuit in time. When the load of the power system is exceeded, the power monitoring system can quickly alarm and issue a voice prompt. In addition, the power monitoring system can also generate statistical information such as reports and graphs, so that relevant personnel can analyze the power consumption status of each part, and make the electricity activities of Wanlian City safer, thus ensuring the safety of Wanliancheng personnel and improving their lives. The efficiency of office workers. 2.1 System structure According to the power distribution situation and office distribution of the newly built office building, the power monitoring system construction adopts a layered and distributed structure. The system includes: station control management layer, network communication layer and field equipment layer. The system network structure is shown below:

The station controls the management personnel to directly interact with the computer for human-computer interaction, calculate, analyze and process all kinds of data information on the collected site, and reflect the operation status of the site in the form of graphics, digital display, sound, etc., which is the most Upper part. Mainly consists of system software and necessary hardware equipment, such as industrial grade computers, printers, UPS power supplies and so on.

The device used by the communication layer is the NPORT5610 serial server. This layer is a bridge for data information exchange. It is responsible for collecting, classifying and transmitting the data information returned by the field devices, and at the same time relaying various control commands of the host computer to the field devices.

The field device layer is mainly connected to various types of instruments used for electrical parameter acquisition and measurement in the network, and is also a basic component necessary for constructing the power distribution system. According to the actual characteristics of the project, the ARCM200L-Z2 intelligent instrument is installed in each circuit of the low-voltage distribution circuit during the design of the project to realize the residual current, temperature, three-phase current, three-phase voltage, frequency, power and four of each circuit. Quadrant electric energy and other electrical parameter monitoring; and monitoring the closing state of each circuit breaker.

2.2 Network Design The network system in the power monitoring system can transmit data in time and quickly transmit operational commands, which is the basis for realizing the functions of the power monitoring system. For the Jiashan Wanliancheng power monitoring system, the monitoring equipment in the system is concentrated in one power distribution room. At this time, each device can be connected to the bus in situ, and then all the buses are connected to the communication gateway. To achieve the delivery with the host. 2.3 monitoring system software function design

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

2.3.1 Data collection and processing

Data collection mainly includes analog quantity and digital quantity acquisition. The analog acquisition is mainly to collect information such as line voltage, current, residual current, power, power factor, frequency, etc. The collection of the switch quantity is mainly the working state of the circuit breaker, the isolating switch, the grounding knife and other equipment, and Alarm information such as power failure protection and operation failure is collected to realize local real-time display of remote data. The data processing mainly displays the electric parameters collected as required in real time to the user, and achieves the automation and intelligent requirements of the power distribution monitoring, and simultaneously stores the collected data into the database for the user to inquire.

2.3.2 Data Recording

The data recording function of the power monitoring system is mainly to record the switching state of the circuit breaker and the sequence of protection actions. It requires sufficient memory space in the system, so that the data information is recorded and stored for a long time. Secondly, the data recording function of the power monitoring system also includes recording of fault information, that is, recording and storing data such as real-time current and real-time voltage at the time of occurrence of the fault. It can be seen that the data recording function can accurately reflect the problems existing in the system by recording the working state of the protection device and recording the fault information, thereby facilitating the staff to solve.

2.3.3 Remote operation

The remote operation of the power monitoring system includes remote monitoring, remote communication, remote control and other links to realize remote control of the power system, enabling the staff to remotely observe the current, voltage and other information, analyze the system failure, and protect the device. The status is evaluated, which makes it easier for the staff to operate the equipment such as the isolating switch remotely, which greatly reduces the workload of the staff. However, in the power supply and distribution design, not only the power monitoring system but also the manual operating system must be designed. When the power monitoring system fails, it can be processed manually. 2.3.4 Power Management

In order to realize the supervision of the electricity consumption of each circuit in the building, the system designed the electricity management report. The system automatically generates the daily report, the monthly report and the annual report and prints the report according to the difference of the circuit name. Function, and can query the electricity consumption in a certain period of time of a certain loop, which can help the property to establish an effective energy management assessment system. Through the construction of the system and the establishment of the system, the awareness of energy conservation of the managers who have settled in the store is greatly improved, and the energy consumption of the office management office is effectively saved.

3. Significance of applying power monitoring system in power supply and distribution design

In summary, the power monitoring system helps the power unit to improve efficiency, reduce losses, and reduce operating costs. The power monitoring system can effectively ensure grid management efficiency, reduce power operation costs, and become an indispensable component in power supply and distribution design. section. The power monitoring system's communication, fault alarm, data storage and record functions make the staff more convenient in actual work. They can directly understand the operating status of the power system through the man-machine interface, and can quickly transmit the operation commands. The data transmission of the equipment is realized through network transmission. Therefore, different power monitoring systems can design different networking modes to ensure that data information can be transmitted quickly and accurately. On the other hand, in the power supply and distribution design, the power monitoring system should be used, and the monitoring equipment should be selected according to the actual situation. Generally, power monitoring systems usually use devices with functions such as remote communication, remote observation, and remote control, while some high-end power monitoring systems require smart devices with more complete functions. Setting up a power monitoring system in a shopping mall, hotel, etc., can realize real-time monitoring of high-low voltage distribution circuits in commercial integrated bodies, which is conducive to power management. On the other hand, the power monitoring system can not only accurately indicate the power consumption status of the circuit, but also has the functions of network communication, etc., and can be combined with computers, serial servers and other devices to display the operation status of each power distribution circuit in the building in time. When the load of the power system in the building exceeds the standard, the power monitoring system can quickly alarm and issue a voice prompt. In addition, the power monitoring system can also generate statistical information such as reports and graphs, so that relevant personnel can analyze the power consumption status of various parts in the building, and make the electricity activities in the building safer, thus ensuring the safety of the people in the building and improving the office. Staff efficiency.

references

[1] "Application of Power Monitoring System in Power Supply and Distribution Design", Gao Shihong, Technology Wind [2] "Power Monitoring for 10kv Power Supply and Distribution Design", Yao Qiang, Technology World