With the development of power grid infrastructure and the development of electric energy input, the demand for electrical complete sets of equipment has increased year by year, the speed of product upgrading and replacement has been accelerated, production equipment and processing technology have been significantly improved, electrical equipment has been intelligentized, and secondary and secondary integration technologies have been integrated. Equipment performance has improved significantly.
Primary equipment refers to the high-voltage electrical equipment that is used directly in the production process of producing, transporting, and distributing electrical energy. It includes circuit breakers, disconnectors, automatic switches, knife switches, cable buses, transmission lines, Power Cables, etc. The electrical equipment that is connected to each other by a primary device to form a switch of a power distribution device or perform a process of its closing and closing operations is called a primary device. Also known as a passive component. Secondary equipment refers to the low-voltage electrical equipment needed to monitor, control, regulate, and protect the work of the primary equipment and to provide operation and maintenance personnel with operating conditions or production command signals. Secondary equipment connected to each other constitutes an electrical equipment that monitors, controls, regulates, and protects primary equipment as a secondary equipment. Also known as active components.
First, the intelligent integration (a second integration) switchgear technical characteristics:
Complete sets of integrated equipment have been used in the production of the first and second fusion technology.
It has plug-and-play effect in the construction of distribution automation system. The automatic management of automatic alarms, emergency handling, real-time monitoring of operations, maintenance inspection and information monitoring, and statistical analysis of background data are implemented directly after accelerated communication. The SCADA system can monitor 10kV line load conditions and perform remote control operations. Therefore, when the main network is faulty, the main network is powered off, the user is connected to the fire, and the fault is transferred, the distribution network mode is less adjusted. The “telemetry†function of the distribution network automation system allows accurate calculations of the operating mode adjustment; combined with its “remote control†function, the operating mode can be flexibly adjusted at any time.
(1) Switchgear intelligent control device DTU The secondary device (embedded intelligent terminal) is the core component of the switchgear automation equipment. The electronic controller is a new type, multi-function, electric operation control mechanism developed for the current medium voltage system switch cabinet.
(2) Intelligent digital dynamic indication of field terminal information collection DTU device. The upgrading and transformation of information technology for traditional equipment is to integrate the embedded intelligent control unit that integrates industrial automation technology, and to increase the electrical performance of switchgear through the addition of components and technology, so as to realize complete automation of distribution networks. The series of matching products provide a reliable solution for the design and modification of distribution automation equipment.
(3) The compatibility of the equipment is the key. The electronic controller must be able to safely control various types of switchgear.
(4) The switch cabinet shall be upgraded from a manual operation to a remote operation. The first step is to install a motor drive structure and convert the manual lever operation into a button operation.
(5) personalized customization program
The difference between customized high-end equipment and common standard equipment
The biggest difference between high-end equipment and traditional equipment is:
Traditional equipment relies on traditional craftsmanship, low technical level, low labor efficiency, and high labor intensity.
High-end equipment relies on high-tech advantages, and it is easy to replace traditional equipment.
The biggest gap between traditional equipment manufacturing and high-end manufacturing lies in the strength of science and technology. The transformation and promotion of traditional manufacturing by high-end manufacturing is an inevitable process of manufacturing development.
High-end equipment adopts customized and personalized production to meet the needs of some equipment upgrades.
Technical features of high-end equipment
High-end equipment manufacturing is a high-end link in the manufacturing value chain. It has the characteristics of high technology, knowledge, high added value, good growth, strong keyness, and high mobility. High-end equipment is based on powerful general-purpose equipment manufacturing. It extends from the traditional general equipment manufacturing to the high end of the value chain.
Complete set of non-standard customized equipment basic features;
The flexible combination of assembly variants.
Large application coverage.
Process and technology form a comprehensive application.
Combination of high efficiency
Simple operation can shorten working hours,
Provide a variety of machines and the best quality service.
Second, intelligent integrated switchgear technology
(I. Secondary equipment) Integration of key technologies is often referred to as integration and technology.
Due to the different mounting positions of various electrical components, it is necessary to divide the components when forming a complete electrical control system.
1. Combine functionally similar components in a modular format;
(1) Reduce the number of connections between components as much as possible, while placing control devices with close wiring connections in the same assembly;
(2) Reduce the voltage level with a uniform supply voltage
(3) It is possible to combine electrical modules with similar physical dimensions and functions.
(4) In order to facilitate the inspection and debugging of the electrical control system, it is necessary to combine the constant adjustment, maintenance and wearing components.
2. In order to divide the components of the electrical control cabinet, it is necessary to solve the connection mode between the components, between the electrical boxes and between the electrical box and the controlled device:
The wiring between the various parts and components of the electrical control cabinet should generally follow the following principles:
(1) Switching electrical appliances, control board inlet and outlet lines generally use the terminal head or wiring nose connection, which according to the size of the current and the number of incoming and outgoing lines use different specifications of the terminal head or wiring nose;
(2) Electrical cabinets, control cabinets, cabinets (tables), and between them and the controlled equipment, connected by terminal blocks or industrial connectors;
(3) Various types of standard connectors should be used between weak control components and printed circuit board components;
(4) The connection between the components in the electrical cabinet, control cabinet and cabinet (table) can be directly connected by using the terminal of the component itself; the transitional connection line should be connected by terminal block transition, and the terminal should adopt the corresponding specification of the connection terminal. deal with.
(5) The on-site acquisition equipment is mainly the contact pressure sensor of the switch opening and closing position, the voltage transformer, the current transformer, and some auxiliary information contacts.
To increase the electric operating mechanism, it is necessary to distinguish between different performance mechanisms such as circuit breakers, breaking switches and load switches.
The operating mechanism is modular, and the customer directly participates in the design and manufacturing process of the complete equipment through a complete interaction process, and accurately locates the customer's actual needs. In the process, we make various prototype templates based on the customer's different demand data to improve the user. Experience.
Modification of the remote signaling part: It is mainly to determine the position of the switch opening and closing, the position of the grounding switch, and the energy storage of the electric operation mechanism.
Motor rotation direction and other technical principles.
Retrofit part of remote control: Loop switch remote control closing control output. Remote closing and closing control output. Satisfy the different application functions of all switches: five kinds of commonly used switches such as circuit breakers, reclosers, inlet switch C type, outlet switch F type, and load switch.
For the development of smart grids and the automation of distribution networks, a positive and beneficial exploration was carried out. Utilizing the manual load switch cabinet on the line, through the structural process improvement of the ring network cabinet, the technical upgrading of the manual local operation to the remote automatic control operation is completed. After installing the electric operation mechanism on the manual ring network cabinet, the intelligent electronic type electric operation Controllers, PT transformers for power take-up, and CT for cable measurement, convert manually operated load switch cabinets into distribution automation terminals with “three remote†functions, and replace key nodes in distribution networks with distribution network automation terminals. The equipment realizes the overall technical solution of the manual RMU for distribution network automation technology transformation.
(6) The key items of the retrofit program include: structural design improvement of the RMU cabinet; PTs on site are customized according to the type of RMU; installed electronic intelligent controller to realize the integration of the secondary control. Integrated AC/DC conversion backup battery pack, safety operation controller, and DTU are integrated. The RMU solves the AC220V power supply problem of automation equipment without a separate power PT cabinet. The installed electronic intelligent controller integrates battery, safety operation controller and DTU. It has five cores: composite sensor technology, load dispatching alarm control technology, mechanical and electrical safety control technology, integrated wiring technology and central integrated monitoring platform technology. The key technology has realized the technical upgrading of the manual switchgear cabinet and has met the safety and reliability requirements of the integrated remote control of the switchgear cabinet.
3, Siemens SIEMENS 8DJ20 intelligent integrated switchgear demonstration
SIEMENS 8DJ20 RMU All insulation bushings for electrical and mechanical connection are welded to the air chamber. They do not use any type of sealing ring or plastic sealing device, which completely guarantees the airtightness of the entire air chamber. Temperature-compensated pressure indicating devices are completely unaffected by the environmental climate. The use of a single-blade three-position load switch eliminates the possibility of simultaneous grounding of the load switch in the closed state from the mechanical principle.
The Siemens family of power and process automation products provides solutions such as IT systems for electrical systems with a complete product portfolio. Siemens is committed to providing high-reliability products. With its innovative industrial design and intelligent manufacturing technology, Siemens can simplify the entire manufacturing and installation process through the modular manufacturing of the system. Improve efficiency.
Siemens offers open and flexible solutions and service architectures through the industry's most comprehensive energy management product line: in particular in the area of ​​intelligent distribution networks, the promotion of new Siemens smart grid kits, with which a large number of customized solutions can be realized. With smarter grid infrastructure and further development of stable systems, Siemens has driven information technology as its business owner. It aims at technologies such as Internet of Things, cloud computing, and big data, integrates the current global advanced production management system, and constantly develops new business models.
(1) Siemens 8DJ20 switchgear solutions are fixed and cannot be expanded. They are mostly used in outdoor switching stations, cable distribution boxes and other secondary distribution systems that do not require metering. Suitable for a variety of substations - including in extremely harsh environmental conditions such as industrial environments, wet, sandy or dusty areas, simple outdoor substations.
(2) Overall dimensions
Siemens 8DJ20 Body Dimensions Length 1400mm Width 850mm Height 1400mm
After opening the door, the cabinet size is 1600mm high and 1600mm high
(3) Siemens 8DJH upgrade process system test
After the completion of the construction, a thorough system test is required.
Now complete a pre-shipment experiment according to the test system requirements.
There are four items in the public information box door open, external power loss, battery failure, low box pressure
Retract the grounding switch, turn the computer and display panel
Manual opening information status monitoring
Electric closing test
Remote control test
Factory production efficiency is high and product quality is stable.
Third, distribution network automation upgrade comprehensive solution.
The program includes: upgrading of safety control level, layout of cabinet structure, one-to-two integrated wiring, different control models and control technology for cable network automation and overhead feeder automation, standardization of switch cabinet functions, appropriate reduction of switch cabinet types, fault location technology, and standardization Construction process, software online monitoring, system safety evaluation, operation mode and protection setting analysis, late operation maintenance, system experimental testing, line fault simulation and practical training.
The task of retrofitting is to install a drive motor on the operating mechanism, which is upgraded to an electric button operation by relying on the manual lever operation. Make full use of the old equipment for upgrading, so that the primary equipment and secondary equipment can be closely combined.
1. The intelligent first- and second-integrated complete sets of equipment bring together the protection, control, monitoring, and measurement of the entire transmission and distribution system, realizing the automation of the distribution network and laying the foundation for the wide-area monitoring and diagnostic system to ensure the safety of the power system. Reliable and economical operation. With the development of computer technology, data processing technology, information sensor technology, communication and data storage technology, power electronics technology, and the integration of various disciplines, the intelligent, compact and compact equipment of electrical complete sets of equipment has gradually become an industry development. Important trends.
The application of electrical complete equipment is mainly achieved through 3 ways.
(1) Install smart electrical equipment directly in the future incremental power grid construction.
(2) The technical upgrading of the existing equipment for operation has increased the level of intelligent electrical equipment.
(3) Fiber to the home
Optical fiber communication has the advantages of stable communication, large capacity, and high speed, and it fully meets the communication requirements of distribution automation, telemetry, remote signaling, and remote control. The power fiber-to-the-home community can achieve power consumption information collection.
2. The construction of an economical, efficient, and reliable smart grid is inseparable from modern and advanced communication technology platforms. The power supply reliability of the smart grid is the primary condition of the intelligent electrical equipment, and the power communication network is further optimized and perfected to realize the digitization of data transmission of the power grid operating status. Power fiber-to-the-home is a basic construction to improve the automation level of distribution network and improve the quality of power supply services.
3. The new intelligent distribution system put into operation shows the charm of smart electrical equipment. The new intelligent electrical equipment can automatically locate the fault point, automatically isolate the fault zone, and the power failure time of the automation system will not exceed 1 minute to restore the user's power supply. .
4. On the basis of constantly summing up the experience and lessons learned from the switch cabinet renovation, we have unified our understanding to overcome technical obstacles, and completed the overall upgrade and renovation of the outdoor switchgear and the RMU through innovative technologies and methods.
The technical indicators of the electrical equipment after the transformation all meet the requirements of China Southern Power Grid "Technical Guidelines for Automation of Distribution Network Construction." And to achieve a normal operation of the hanging network, the indicators and construction quality to achieve planning and design requirements.
5. The intelligent control device (intelligent terminal) of the switch cabinet is the core component of the complete set of equipment. It is a new type, multi-functional, intelligent digital indication device for on-site terminal information collection developed for the current medium voltage system switch cabinet. The intelligent terminal device can be applied to a variety of 10KV-20KV outdoor power switch cabinets. The intelligent control device of the switchgear is powerful. It is equipped with switchgear cabinets in an "all-in-one" structure layout, which simplifies the panel design of the switchgear cabinet and beautifies the panel layout. With the functions of dynamic digital indication, live display and latching, and its control status, current value display of primary loop voltage value, remote/local operation, and remote communication, the installation and use of intelligent devices further enhance the intelligence of traditional power switchgears. Networking and digitization realize the intelligentization of power grid operation under the “Internet+†model.
6, compact structure, standardized wiring: smart device is the overall structural design, structural selection, materials and other aspects of technical research to ensure that the site has sufficient strength and stability. The intelligent integrated switch cabinet adopts the European EIB (Electrical Installation Bus) (GB/Z20965-2007) standard wiring. The most important feature is the replacement of conventional separate control cables and power cables by a single multi-core cable and ensuring that each switch can transmit control commands. Therefore, the bus cable can be laid out in a line, tree, or star shape to facilitate expansion and modification. .
The utility model has the advantages of simple electric circuit, convenient installation and maintenance, saving the consumption of large-section wire rods, lowering the investment cost and maintenance management cost, shortening the installation period, and improving the investment efficiency.
Intelligentization, miniaturization, high security and reliability can be integrated, which is the ultimate development of a new generation of smart devices for power grid integration.
Cross flow fans are mainly used for air conditioners, air curtain equipment, dryers, dry-type transformers, household appliances and equipment on grain combine harvesters
Service conditions of transformer cooling fan:
1. The ambient temperature shall be+75 ℃ ≥ - 40 ℃.
2. The industrial gas passing through the cooling fan is not allowed to have strong acid, strong alkali and various solutions.
3.Sand and dust and other sundries are not allowed to fall into the fan, so as to avoid fan burning and fan blade breakage.
Working principle
When GF series cooling fan is used for dry-type transformer, the fan is placed on both sides of the coil, and the cold air is directly blown into the high and low pressure cooling air passages of the dry-type transformer coil, which has obvious heat dissipation effect, ensuring the normal operation of the dry-type transformer and prolonging its service life. Fan start stop, transformer overtemperature alarm, overtemperature trip and other functions are provided by the temperature control device.
Maintenance and use
1. Before the fan is used, the insulation resistance shall be tested to be greater than 2 megohms. When the fan is hot or humid, the insulation resistance shall not be less than 0.5 megohms.
2. Before starting the fan, please check whether the appearance is intact, whether the connection is reliable, and whether the wind wheel rotates flexibly without blocking.
3. Clean the dust in the fan regularly to prevent affecting the air volume.
Cross Flow Cooling Fan,Copper Cross Flow Fan,Transformer Cooling Fan,Top Blowing Series Cooling Fan
Henan New Electric Power Co.,Ltd. , https://www.newelectricpower.com