Ankerui Qingqing Jiangsu Ankerui Electric Appliance Manufacturing Co., Ltd. Jiangyin, Jiangsu 214405 Abstract: Based on the current rapid development of science and technology, people rely more and more on power resources. At this stage, the operating costs of domestic power systems are relatively high. Therefore, it is imperative to improve the work of all aspects of the power system. 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 costs of the power system. This article describes the application of power substations in the Jilin Station West Square project. Application in the field of transportation. Key words: power system; Jilin station; monitoring system 0 Preface Distribution automation is an integrated 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 the quality of power, provide users with quality services, reduce operating costs, and reduce the labor intensity of operating personnel. With the continuous development of the electric power network and the continuous increase in the power load, various new types of loads have emerged continuously. Users are paying more attention to the issue of power quality. At the same time, they also put forward more stringent requirements on power quality. Users need more effective power monitoring and management solutions to meet the challenges brought about by these changes, in order to achieve a continuous, reliable, efficient and low-cost operation of the power distribution system. This article describes the application of the power monitoring system in the railway station through the construction of the power monitoring system for Jilin Station West Plaza project. 1 Project Overview and Construction Objectives The overall project of West Plaza is divided into underground and above-ground construction. The total area is over 120,000 square meters. The project includes landscape plaza, public parking lot, underground taxi parking lot, social parking building, road passenger transport complex, and traffic transfer hall. , underground shopping malls, city corridors connecting the train station East and West Square and other projects. 2 Design of power monitoring system The power monitoring system of this project can realize the real-time monitoring of the high-level and distribution circuit in the station and is conducive to the management of power. On the other hand, the power monitoring system can not only accurately show the power status of the loop, but also has network communication and other functions. It can be combined with computers, serial servers and other devices to display the status of each distribution circuit in the station. When the load of the power system in the station 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, which facilitates the analysis of power consumption in various parts of the station and makes the power activities in the station more secure, thereby ensuring the safety of people in the station and improving the staff of the station. Work efficiency. 2.1 System Structure According to the distribution situation of Jilin Station West Plaza, the online monitoring system construction adopts a hierarchical distributed structure. The system includes: station management layer, network communication layer, and field device layer. The network structure of the system is shown in the figure: The direct window of human-computer interaction between the management and management personnel of the management team and the computer calculates, analyzes, and processes various types of data collected on the site, and reflects the operating status of the site by means of graphics, digital display, sound, etc., which is the most systematic The upper part. Mainly by the system software and necessary hardware equipment, such as industrial-grade computers, printers, UPS power supply and other components. The device used by the communication layer is the NPORT5630-8 serial port server. This layer is a bridge for data information exchange. It is responsible for the collection, classification, and transmission of data information sent back by field devices, and it also conveys various control commands from the host computer to the field devices. The direct window of human-computer interaction between the management and management personnel of the management team and the computer calculates, analyzes, and processes various types of data collected on the site, and reflects the operating status of the site by means of graphics, digital display, sound, etc., which is the most systematic The upper part. Mainly by the system software and necessary hardware equipment, such as industrial-grade computers, printers, UPS power supply and other components. The field device layer is mainly connected to various types of instruments used for the collection and measurement of electrical parameters in the network, and it is also a necessary basic element for constructing the distribution system. The on-site electric energy meter is configured to realize the monitoring of electric parameters such as three-phase current, three-phase voltage, frequency, power, and four-quadrant electric energy of the low-voltage loop; and the status of each breaker circuit breaker is monitored. 2.2 Network Design The network system in the power monitoring system can transmit data in time and quickly transfer operation instructions, which is the basis for realizing various functions of the power monitoring system. Connect each device on the spot with the bus in the scene, and then connect all buses to the communication gateway to realize the transfer with the host. 2.3 monitoring system software function design The system is designed according to the customer's actual needs, and realizes a main wiring diagram interface display; electric parameter telemetry and electric parameter crossing limit alarm; event recording; system operation abnormality monitoring; fault alarm and operation record; report query and printing; system load real-time , history curve, user rights management and other main functions. 2.3.1 Data Acquisition and Processing Data acquisition mainly includes analog and digital acquisition. The acquisition of analog quantity mainly collects the information of line voltage, current, power, power factor, frequency, etc. The collection of switch quantity is mainly the working status of the circuit breaker, isolation switch, grounding switch and other equipment, and the power-off protection. Alarm information such as operation faults is collected to realize local real-time display of remote data. Data processing is mainly to display the electrical parameters collected according to requirements in real time and accurately to the user, to achieve the automation and intelligent requirements of the distribution monitoring, and at the same time storing the collected data into the database for user query. 2.3.2 Data records The data recording function of the power monitoring system is mainly to record the sequence of the circuit-breaker-disconnected state and protection operation. It requires that there must be enough memory space in the system, and then a long time and a large amount of data information is recorded and stored. Secondly, the data recording function of the power monitoring system also includes the recording of fault information, that is, recording and storing data such as real-time current and real-time voltage when the fault occurs. It can be seen that the data recording function can accurately reflect the problems in the system through the recording of the working status of the protection device and the recording of the fault information, thereby facilitating the solution of the staff. 2.3.3 Power Management In order to realize the supervision of the power consumption of each circuit in the station, the system has designed a power management report. The system automatically generates daily reports, monthly reports, annual reports, and report printing functions by collecting the active power, according to different circuit names. It can also inquire about the electricity consumption in a certain time period 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 energy-saving awareness of all registered management personnel has been greatly improved, and energy consumption has been effectively saved. 3 Significance of Application of Power Monitoring System in Power Supply and Distribution Design In summary, the power monitoring system helps power consumers improve efficiency, reduce losses, and reduce operating costs. The power monitoring system can effectively ensure the efficiency of power grid management and reduce the cost of power operation. It also becomes an indispensable and important component in power supply and distribution design. section. The power monitoring system's functions such as communication, fault alarm, and data storage and recording make the staff more convenient in practical work. Through the man-machine interface, the operating status of the power system can be directly understood and the operating instructions can be quickly transmitted. The transmission of data to devices is achieved through network transmission. Therefore, different power monitoring systems can be designed with different networking methods to ensure that data information can be transmitted quickly and accurately. On the other hand, in the power supply and distribution design using the power monitoring system, monitoring equipment should be selected according to the actual situation. The general power monitoring system usually uses devices with long-distance communication, remote observation, and remote control functions, while some high-end power monitoring systems require smart devices with more complete functions. The installation of a power monitoring system in places such as transportation can realize real-time monitoring of the low-voltage distribution circuit within the station, which is conducive to energy management. On the other hand, the power monitoring system can not only accurately show the power status of the loop, but also has network communication and other functions. It can be combined with computers, serial servers and other devices to display the status of each distribution circuit in the station. When the load of the power system in the station 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, which facilitates the analysis of power consumption in various parts of the station and makes the power activities in the station more secure, thereby ensuring the safety of personnel in the station and improving the work of the staff. effectiveness. references [1] "Principles and Application Guide for Power Electronic Measurement Digital Meters", Ren Chengcheng, Zhou Zhong, China Electric Power Press [2] "Application of Power Monitoring System in Power Supply and Distribution Design", Gao Shihong, Science and Technology Marine Electro-hydraulic Windlass The windlass is installed on the main deck of the ship's bow, which is used for the ship to lift the anchor and drop the mooring cable. Marine Electro-Hydraulic Windlass,Windlass Anchor,Electric Windlass,Manual Windlass TAIXING HAITAI GLOBAL TRADE CO.,LTD , https://www.jshaitship.com
Windlass can be divided into manual, electric, hydraulic, pneumatic, etc. according to the driving form.
The windlass can be divided into several specifications such as φ12--φ120mm according to the diameter of the anchor chain.
Windlass can be divided into single-sided and double-sided according to the distribution of drums.
The windlass is mainly composed of base, bracket, chain wheel, brake, chain wheel, gearbox, electric control system (except manual windlass), etc. Electric windlasses have electric motors, and hydraulic windlasses have hydraulic pump stations.
The main technical indicators of the windlass include the diameter of the anchor chain, the nominal speed of the anchor, the rated load, the supporting load, several levels of speed change, electrical system, etc. The installation of the windlass on the ship should ensure that the wrap angle between the anchor chain and the sprocket is 117-120°.
Electric windlass
The electric motor directly drives the windlass, and the drive shaft is driven by the gear box to work, and the structure is simple; it is generally suitable for windlasses with an anchor chain diameter of 16mm-93mm.
hydraulic windlass
It is suitable for windlass with anchor chain diameter of 16mm-120mm. Hydraulic windlasses are also called electro-hydraulic windlasses. It drives the oil pump with a motor, drives the motor with high-pressure oil, and then drives the transmission gear through a reducer (or no reducer). To make the windlass run, its structure is relatively compact and its volume is small. Now there has been an automatic hydraulic windlass, which is equipped with an anchor chain length sensor. When the anchor chain needs to be thrown out, the windlass will automatically stop; , can automatically decelerate; the anchor will automatically stop when it enters the anchor chain drum and is properly received.