Tengkong Technology’s distribution transformer monitoring program based on GPRS+ AC sampling small RTU
chrispeng [ad_1]
1 Introduction
With the rapid development of wireless communication technology and measurement and control technology, it has become a trend to realize the monitoring of distribution transformers based on GPRS + AC sampling RTU.
The distribution transformer monitoring system is a SCADA system, that is, a remote data collection, monitoring and control system. It is divided into three parts: monitoring center, communication, and terminal.
The hardware of the monitoring center adopts industrial computer, and the software platform adopts the latest configuration software technology, based on the B/S mode, which can be browsed through the network. The monitoring center software provides users with a visual monitoring interface. The monitoring interface allows users to understand the operating status of the transformer intuitively, conveniently and quickly. Through this interface, users can understand the working conditions of various transformers in time, and have functions such as sound and light alarms. At the same time, the user can retrieve the historical operating state curve of the transformer by querying the historical database, thereby predicting the load condition of the transformer, and completing the corresponding data management function of the upper computer.
The use of GPRS for communications and the use of wireless network platforms provided by mobile operators to implement SCADA are an important development direction for power system modernization. Since the communication technology of the GSM network is mature and the coverage is wide, the use of GSM wireless communication to realize real-time acquisition of transformer parameters is undoubtedly the greatest use of existing resources. The most important thing is that the GSM network is invested and controlled by mobile operators, which can save hundreds of billions of wire materials and labor costs, achieve the purpose of environmental protection, energy saving, and maximum sharing of resources, and eliminate the daily modification and maintenance of the network. , Which saves investment to the greatest extent. No matter when and where, as long as there is a computer and a telephone line with Internet access, the transformers in various places can be monitored. Compared with the wired method, the cost is low, easy to install, easy to maintain, and high in reliability.
RTU uses industrial-grade RTU to monitor the working conditions of transformers in real time, including three-phase voltage, three-phase current, three-phase power (load), three-phase reactive power, three-phase unbalanced current, power factor, harmonics, and pulses. The power of the meter, the temperature of the transformer, etc., can be optimized for the operation of the distribution network through the working condition of the transformer. When a fault occurs, an alarm will be issued and troubleshooting will be carried out in time to reduce the time of power outage, reduce economic losses and reduce the cause to users Inconvenience, improve the quality of power supply.
2. System architecture
3. Three-dimensional force control PCAUTO3.62 configuration software introduction
1 Main features
(1) Integrated management and control software
Powerful Web functions and Internet/Intranet browser technology directly support multiple documents. WWW functions are all realized by VC++, so when remotely accessing the monitoring screen on the Internet, it has better real-time performance. At the same time, it is easy to use ASP and other rapid development tools to construct the B/S system structure, and can directly access the single window.
The domestic leading network system architecture supports B/S and C/S access methods, and supports multi-level network redundancy and failover. Provide multiple redundant structures, support IO device redundancy, network redundancy, database redundancy, etc.;
On the basis of a large number of applications of the PC-based “soft PLC” suite, the control strategy generator is more complete and conforms to the characteristics of the site, and it is easy to construct a complex control system based on the PC;
Equipment communication and force control network nodes support GPRS, CDMA and other mobile communication functions; GSM mobile phone SMS alarm management system facilitates the management of alarm information;
Redesigned encryption system to support engineering encryption;
(2) New features of HMI
Redesigned HMI development system, more components and controls to facilitate you to form a powerful system; rich functions and device drivers make it easier for you to integrate;
The enhanced transition color and progressive color function fundamentally solves the problem that many similar software use transition color and progressive color too much, which seriously affects the screen refresh speed and system operating efficiency;
The optimized design of the toolbox and palette makes color selection more intuitive and convenient; the development is more flexible, more vector submaps, and project screen creation is faster.
Provide object-oriented programming methods, built-in indirect variables, intermediate variables, database variables, support custom functions, support large screens and custom menus, it is convenient for you to construct a powerful enterprise-level operating system,
Script types and triggering methods are diverse, and support array operations and loops.
(3) Openness
Directly access the database by way of EXCEL and VBA;
Design in compliance with engineering specifications: More functional components are designed to meet the needs of engineering and technical personnel, and sufficient flexibility ensures that it has a wide range of adaptability;
The data forwarding component is flexible and convenient, and OPC technology directly supports time stamp and quality stamp;
Multi-language version guarantees the expansion of your project
(4) Development system
Force Control provides a highly integrated and visual development environment. The extremely friendly interface style makes it very easy for you to “get started”.
* Gallery
Integrated development environment, enhanced graphic functions, rich graphic elements and super sub-picture sprite library collection, providing sub-picture sprite development tools, users can easily generate their own library; force control? Optimal design of the library provides a wealth of The sub-pictures and “sprites of the sub-pictures” can be dragged arbitrarily without being deformed, making your project picture better.
* Internal components
Video component: for video capture and playback;
Temperature control curve component: automatic temperature rise and heat preservation control can be carried out;
Browser component: can be used as a standard browser client;
Standard WINDOWS components: support standard text boxes, single selection boxes, list boxes and other components;
Enhanced alarm components: integrated alarm management and query;
X-Y curve components: curve analysis and query can be carried out freely;
Slideshow component: flexible slideshow, free control;
Free curve component: convenient to draw various curves and animation connections;
Universal report component: EXCEL-like report tool to facilitate you to complete management reports;
Stereo bar graph component: analysis tool of histogram;
Historical recall component: can recall data with millisecond tags to facilitate accident inquiry;
Mobile phone text message component: simple mobile phone text message sending component
* Report component:
Historical report:
Convenient and fast historical report generation tool that can generate daily, monthly, quarterly, and annual reports. The time range, interval, and start time of data storage can be arbitrarily specified, and historical data can be queried according to the stored time. Select the historical report in the drawing menu of Force Control.
Embedded multi-function report:
Flexible report generation method, you can set the report format arbitrarily, realize various calculations, data conversion, statistical analysis, report printing, etc. Both real-time reports and historical reports can be made. Real-time data and historical data at any time can be displayed on the report at the same time, and statistical processing, such as taking the row average, column average, and statistics of the maximum and minimum values. The embedded multi-function report provides the corresponding report function. Various report templates can be made and used for multiple times to avoid repetitive work. The configuration is in the sub-picture of the force control.
Built-in data sheet:
The built-in data table is a built-in real-time relational data table developed by the developers of Force Control to summarize the characteristics of the relational database. Using the report template, the variables of the Force Control real-time database and the report fields can be bound arbitrarily, and any data can be inserted or deleted. , Traverse, save, the built-in report filter can arbitrarily set the query conditions in different situations, and select the found records according to the query conditions to participate in data processing.
Action script
Action script types and triggering methods are diverse, with custom function functions, support for array operations and loop control. Built-in multiple printing functions, the printing range can be set arbitrarily according to the size of the screen.
Custom run menu
Force Control supports user-defined menus, including window pop-up menus and right-click menus defined on various graphical objects. With script programs and custom menus, a more flexible and complex human-computer interaction process can be realized.
System security
Force Control provides a complete safety protection mechanism to ensure the safety and reliability of the production process. The user management of Force Control® divides users into multiple levels such as operators, monitors, engineers, and system administrators, and can restrict the modification of important process parameters according to the levels to effectively avoid misoperations in the production process.
Alarm and event logging
Force Control automatically records important events such as system status changes and operating procedures during operation. Once an accident occurs, it can be used as a basis for analyzing the cause of the accident, and providing basic data for the realization of accident recall.
(5) Distributed network
Features
Force control is a real () () type network system. In engineering projects, users can flexibly construct a network structure that meets the requirements according to actual needs. Each force control node in the network can be constructed in B/S and C/S methods.
Network redundancy
Force Control? Supports multi-level network redundancy, and supports the synchronization of alarms, historical data and network clocks. On the basis of dual-computer redundancy, other network nodes automatically track the switch of redundant master/slave. Each network node can not only monitor, but also control.
Open way
The software is an open architecture and fully supports DDE, OPC, ODBC/SQL, ActiveX, and DNA standards.
It provides external access interfaces in various forms such as OLE, COM/DCOM, dynamic link library, etc., which is convenient for users to use various common development tools (such as: VC++, VB, etc.) for in-depth secondary development.
Multi-language support
Likong also has English, traditional, and simplified Chinese versions. There are application examples of Likong? software in Sudan, Egypt, Malaysia, Bangladesh, and Myanmar.
Force Control will accelerate the process of internationalization and adapt to the requirements of WTO accession.
(6) Regional real-time database
data processing:
Force control monitoring configuration software built-in regional real-time database, regional real-time database built-in multiple functional blocks to complete data processing, can achieve accumulation, statistics, control, linearization, PID control, various calculations and other functions.
The regional real-time database completes functions such as real-time data, alarm checking, and historical data storage.
The database manages production data according to area, unit, and sub-unit, and is divided into a 6-layer structure to facilitate data management
The database structure is a configurable “living structure”. Users can customize their own various database structures according to actual needs to facilitate the management and search of data.
Force control? The database possesses the distributed characteristic in the true sense. The HMI (Human Machine Interface) part and the database part of Force Control can run on different network nodes respectively, and the HMI on any operating station can access the database on any server. The databases running on different network nodes can also access each other. Realize the distributed processing of data, the centralized monitoring and management of the interface.
Rich database components:
ODBC two-way data dump component: It can perform two-way dump of real-time historical data to the relational database through ODBC driver with various relational databases;
GSM short message management component: complete alarm short message management, when there is a problem in production, the alarm information will be sent to the manager’s mobile phone in a timely manner through the mobile network;
PORT SERVER data forwarding component: support other nodes of the network to access data through serial port, network, MODEM, GPRS, CDMA, etc.;
NETSERVER component: a dedicated network data server component, which forms the core of distributed applications
DBCOM control: Standard Activex control, allows third-party development tools to access real-time database, and supports C/S network access.
SoftPLC component: The control strategy generator builds the soul of PC control;
OPC/DDE SERVER: Standard data server, third-party software can traverse various real-time and historical data of real-time database through DDE and OPC standards.
4. Introduction to Xiamen Sangrong GPRS DTU
Saro3130P GPRS DTU is a data transmission terminal based on mobile 2.5G GPRS network platform, embedded TCP/UDP protocol and powerful single-chip microcomputer system. Adopt Siemens MC35i industrial-grade communication module, industrial specification design. Provide RS232/RS485/RS422 and other standard serial interfaces, and directly transparently connect with PLC, RTU, FTU, TTU and other acquisition equipment. Realize GPRS remote real-time data transmission function.
5. Introduction to STC-2 RTU of Beijing Yikong Microgrid Technology
(1) STC-2 function indication:
(2) Brief introduction of STC-2 function:
Measure transformer three-phase voltage, three-phase current, three-phase active power, three-phase reactive power, three-phase total active power, three-phase total reactive power, frequency, power factor, 1-31 harmonics (STC-2XB has This function), integral power, three-phase unbalanced current, etc., fast data refresh speed, voltage and current inputs are isolated, and the accuracy is within 0.5%
2 DC analog inputs (0-20mA or 0-5V), the accuracy of the transformer can be measured by a temperature transmitter
3-way switch quantity relay isolation output (contact capacity 250VAC 5A, 30VDC 5A), can be used as remote control, trip or alarm
6-channel switching value photoelectric isolation input, which can also be used as pulse input (measuring the output pulse of the watt-hour meter), with SOE (event recording) function
Isolated two-way 485 or 232, MODBUS RTU communication protocol
SMD installation, no external bus, high EMC performance
Clip-on guide rail or screw fixation
Working temperature: -20℃ to 70℃
EMC test can reach level IV
6. System Features
This system is composed of high-quality products from well-known domestic manufacturers, adopts an open protocol MODBUS, and is used in many similar SCADA systems. It has the characteristics of high reliability, high comprehensive cost-effectiveness, good openness, easy expansion, easy maintenance, and easy installation.
7. System reference configuration
Assuming a transformer is tested, the list of configuration equipment is as follows:
monitoring Center:
Industrial computer one
One laser printer
UPS power supply one set
A set of configuration software PCAUTO3.62
Broadband Internet access conditions (or mobile data dedicated line, depending on the number of terminal points)
on site:
GRPS DTU (including accessories) one
One static IP GPRS SIM card
One STC-2 RTU
Temperature transmitter one
PT100 or CU50 temperature sensor one
Pulse watt-hour meter one
24V switching power supply one
Outdoor waterproof box (including internal wiring, etc.) one
[ad_2]
