The continuous growth of power demand and power grid construction investment provides guarantee for the development of low-voltage miniature circuit breaker accessories market
Low voltage circuit breaker accessories are one of the important components in power distribution and power consumption in the power system, so power has also become one of the important application fields of China's low-voltage circuit breaker industry. Its demand, power grid construction investment and new power generation equipment demand all affect the market demand trend of low-voltage circuit breaker.
According to the report on the development trend research and future prospect analysis of China's low voltage circuit breaker accessories industry (2022-2029) released by Guanyan report network, the power consumption of the whole society in China maintained a rapid growth from 2016 to 2021, and the investment scale of power engineering showed a rising trend. According to the data of the National Bureau of statistics, in 2021, the power consumption of China's whole society was 8312.8 billion kwh, a year-on-year increase of 10.3%; The investment in power engineering construction of major power generation enterprises completed 553 billion yuan, a year-on-year increase of 4.5%; The installed capacity of power generation was about 2.38 billion kw, a year-on-year increase of 7.9%.
What are the precautions for the use of miniature circuit breaker
1. After the circuit breaker is connected, it is necessary to check whether the circuit is connected correctly. If the circuit breaker can break the circuit correctly, it means that there is no problem with the installation of the circuit breaker and it can be used normally. On the contrary, if it cannot be broken correctly, it is necessary to check the specific line problems and repair them in time.
2. After the circuit breaker leaves the factory, its internal leakage and overload functions are set. No matter what reason, individuals can't adjust the circuit breaker, otherwise its performance will be reduced, so it can't normally protect the line safety. In addition, it is necessary to check the button of the circuit breaker to see whether the breaking of the circuit breaker can be controlled to ensure safe use.
3. When there is a fault in the circuit, the circuit breaker will break by itself. At this time, it is necessary to find the cause of the fault in time and repair it. If the circuit breaker is disconnected due to the short circuit of the line, it is necessary to carefully check the contact of the circuit breaker to see if it is burnt out. If so, it shall be replaced in time.
Manufacturing process of crosslinked cable accessories
The process is to make polyethylene (PE) material with linear molecular structure form cross-linked polyethylene with three-dimensional network branching structure through specific processing methods, so that the long-term allowable working temperature is increased from 70 ℃ to 90 ℃ (or higher), and the short-circuit allowable temperature is increased from 140 ℃ to 250 ℃ (or higher), which greatly improves the actual service performance on the premise of maintaining its original excellent electrical performance.
Cable accessories are widely used because they solve the problem of cable tapping in the transformation of overhead line to cable and have the characteristics of full insulation, full sealing, maintenance free and flexible installation and combination. Crosslinked cables are most commonly used in 10kV distribution network. The cable accessories used in matching refer to the terminal head, middle head and cable junction box. In the early days, the traditional oil paper insulated cable terminal head is now rarely used. At present, the most commonly used are heat shrinkable cable head, cold shrinkable cable head and cold shrinkable middle head. The cold shrinkable cable head and cold shrinkable middle head are also called prefabricated cable accessories, which are widely used in the cable distribution network. Because of full insulation, full sealing and full shielding, prefabricated cable accessories are suitable for all kinds of harsh environments, reliably ensure equipment and personal safety, and greatly improve the reliability of power supply. Therefore, they are the direction of future development.
Cross linked polyethylene (XLPE) insulated power cable (hereinafter referred to as cross-linked cable) will produce dendritic discharge channels under the action of electric field and water, which is called water tree. Water tree will continue to grow with the development of time, and eventually lead to insulation breakdown, which has become an important cause of early damage of power cables.
The production and application of ordinary cross-linked cable has a history of nearly 30 years. It has excellent electrical and mechanical properties in dry environment, but in practical application, the cable laying environment is usually bad. The cable often needs to be immersed in water for a short time or a long time, or in an environment with high moisture and humidity, while the ordinary cross-linked cable has no water tree resistance at all, Under long-term use, the insulation will gradually absorb the water in the environment. Due to a large number of small voids in the cable insulation, the micropores will be filled with water, and the water filled micropores can produce water trees under very low voltage. Under the long-term action of electric field, a large number of water tree will be caused in the cable insulation layer, and the aging of water tree will crack the insulation molecules; When the water tree in the micropore reaches the saturation state, the electrical and mechanical properties of the insulation will decline sharply. The conductive water tree (electric tree) will lose a lot of electric energy and eventually cause the breakdown of the cable insulation layer, which will greatly reduce the service life of the cable.
Liu Duo: promoting the integrated development of 5g and industrial Internet
The 2018 central economic work conference proposed to accelerate the pace of 5g commerce and strengthen the construction of new infrastructure such as artificial intelligence, industrial Internet and Internet of things. 5g will open a new digital era of interconnection of all things. Industrial Internet is the most important application scenario of 5g. The integrated development of the two has become an important direction for the current industrial exploration and will have a significant impact on China's economic and social development.
1、 The development of "5g + industrial Internet" is of great significance
5g is the key support for digital transformation, and the industrial Internet is an important cornerstone of the fourth industrial revolution. "5g + industrial Internet" is of great significance to accelerate the development of digitization, networking and intelligence, expand and strengthen the digital economy, and promote the integration of digital economy and real economy.
(1) "5g + industrial Internet" is an internal requirement to comply with the trend of global industrial change.
With the deepening of a new round of scientific and technological revolution and industrial reform, countries around the world have accelerated the promotion of 5g application, and industry is the key field. At present, China's 5g and industrial Internet have started and developed synchronously with major countries. Actively exploring the integrated application of "5g + industrial Internet" is not only an inevitable choice to comply with the industrial development trend, but also an objective need for China to grasp the historical opportunity of the fourth industrial revolution and take the lead in the new round of global science and technology industry competition.
(2) "5g + industrial Internet" has injected a strong driving force into digital transformation.
5g supports the application scenario from the interconnection of everyone to the interconnection of all things, and expands from the mobile Internet to the interconnection of mobile animals, which can meet the needs of massive information collection, big data processing and remote control. The collection and processing of a large amount of data will gradually narrow the differences in products and services caused by the technical gap. The integrated application of "5g + industrial Internet" in the vertical field will drive the digital expansion of industry, form new organizations, new products and new models centered on intelligence in the industrial field, promote the improvement of quality and efficiency and the optimization of economic structure by providing high-quality services, and realize the reconstruction and upgrading of all social production factors, the whole industrial chain and the whole value chain, Boost the digital transformation and development of the real economy. With the gradual penetration of "5g + industrial Internet" into agriculture, service industry and other fields, it will give birth to new modes and new formats such as smart energy and smart transportation, constantly cultivate new growth points and expand new space, so as to inject inexhaustible power into the development of digital economy.
(3) "5g + industrial Internet" accelerates the evolution and upgrading of new infrastructure.
Industrial Internet is the product and specific carrier of the deep integration of the new generation of information and communication technology and the real economy. It integrates advanced achievements in information and communication such as mobile communication, big data and artificial intelligence, and creates an important infrastructure for digital, networked and intelligent development. 5g has the characteristics of high rate, low delay and large connection, which is highly consistent with the needs of industrial Internet connection diversity, performance differentiation and communication diversification. It is a key enabling technology for the evolution and upgrading of industrial Internet network. The integrated development of 5g and industrial Internet will accelerate the building of a new generation of high-speed, intelligent, ubiquitous, safe and green information network, further improve the intelligent level of traditional infrastructure, build new infrastructure and support the high-quality development of entities.
2、 China's exploration of "5g + industrial Internet" has accelerated
In recent years, China's domestic industry has always been driven by innovation and development, adhered to the combination of enterprise subject and government guidance, independent innovation and open cooperation, and accelerated the R & D and industrialization of 5g and industrial Internet. With the joint efforts of government, industry, University, research and application parties, China's "5g + industrial Internet" continues to make new progress, the integration effect is beginning to show, and the development prospect is broad.
(1) The industrial foundation has been continuously consolidated.
On the one hand, 5g development continues to accelerate. In terms of standard formulation, as of May 2019, the number of patents declared by Chinese enterprises accounted for more than 30% of the global total. In terms of product R & D, Huawei, ZTE and other enterprises take the lead in intermediate frequency system equipment; Hisilicon took the lead in releasing the first 5g base station core chip and multi-mode terminal chip. In terms of network construction, as of November 21, 2019, 113000 5g base stations have been opened in China, and it is expected to reach 130000 by the end of the year. In terms of application promotion, actively promote the application of 5g in industrial Internet, Internet of vehicles, ultra-high definition video, smart city and other fields. On the other hand, the construction of industrial Internet has made positive progress. Manufacturing enterprises actively use new network technology to carry out factory intranet transformation, and basic telecom enterprises speed up the construction of high-quality external benchmarking network; Five national top-level nodes have been built and operated, and the number of logo registrations has reached 1.1 billion; The number of platforms with certain industry and regional influence exceeds 50, the average number of industrial equipment connections of key platforms exceeds 650000, the average number of registered users is 500000, and the average number of industrial apps is 1950; The construction of a national, provincial and enterprise level linkage security system has been accelerated. It has been connected with 12 provinces, covering 91000 enterprises and monitoring 135 industrial Internet platforms.
The continuous progress and improvement of industrial robot technology has promoted the great development of society
As a master of automation technology, industrial robot is known as "the Pearl on the crown of manufacturing industry". It integrates the latest achievements in the fields of machinery, electronics, computers, sensors, automatic control and artificial intelligence. It is increasingly replacing operators to complete monotonous, frequent and repetitive long-time work. In the traditional manufacturing field, industrial robot has become an indispensable core automation equipment after its birth, growth and maturity. The industrial robot industry is a new industry rising rapidly after the automobile industry. In the 21st century, with the rapid development of science and technology, the industrial robot industry has thrived in this "hotbed". The continuous progress and improvement of industrial robot technology has improved social productivity and promoted social development.
Remote monitoring of industrial robots using the Internet can realize remote condition monitoring. It is the premise of remote fault diagnosis and maintenance. It is conducive to improve the maintenance response speed and advance processing ability, reduce the failure rate, and has high practical application value to ensure the efficient operation of industrial robots. In industry, network communication technology has been more and more used in foreign industrial robot remote monitoring service system. ABB Sweden has developed the "remote service" platform. Its core device is a hardware service box with communication unit, which can realize the functions of remote real-time monitoring, data analysis and processing, fault prediction and so on, and can effectively reduce the use and after-sales cost of industrial robots.
Fanuc Japan (FANUC) also put forward its own remote monitoring service scheme. Different from ABB's scheme, FANUC industrial robot itself supports remote monitoring and remote diagnosis and maintenance operation without adding equipment similar to the service box. FANUC's remote service system can carry out remote communication and fault analysis, and timely notify the on-site operators and Fanuc's service engineers to enter Perform troubleshooting.
In academic circles, Jay Lee of the University of Cincinnati and others applied remote prediction analysis to the health management of industrial robots of Nissan company, and successfully predicted the early fault characteristics of industrial robot manipulator through torque and temperature signals [4]. Ken Taylor of the University of Western Australia remotely monitors an ABB industrial robot with six degrees of freedom when connected to the Internet. He can successfully grasp and carry objects to build complex models. Carter et al. Studied the design and implementation of the controller wireless access network of FANUC industrial robot r-j3ib, and successfully designed and developed a prototype network for remote monitoring of industrial robots in Nissan training institution in Mississippi.
Bjerkeng et al. Studied the industrial robot with active camera control based on the weighted pseudo inverse redundancy solution, proposed a systematic remote monitoring solution, and obtained successful experimental verification on KUKA kr-16 manipulator [7]. Sallinen et al. Proposed a framework for remote monitoring and maintenance of industrial robots based on Web user interface, which plays a key role in the implementation of safety monitoring and remote maintenance of industrial robots.
Leutert et al. Developed a remote information control system for remote monitoring of industrial robots. The system allows rapid analysis of the current work cycle and data processing of industrial robots, and makes the data more intuitive. Suzuki et al. Proposed using the tactile interface of tactile information to evaluate the remote monitoring of industrial robot, and completed the experiment of vibration tactile information of industrial robot. In China, Chen Yong of Southeast University proposed a remote monitoring method of industrial robot based on Ethernet network, processed multi-sensor signals through information fusion technology, and was applied to the industrial robot of automobile production line of NAC group. Li Changfeng of Harbin University of technology proposed a network control system of parallel robot based on TCP / IP protocol, which solved the remote control problem of parallel robot in inertial nuclear confinement fusion device, and realized the remote real-time control of parallel robot.
Lu Lu of Fudan University adopts the three-tier network model structure and puts forward a scheme of remote monitoring industrial robot system based on WWW. the scheme carries out real-time remote monitoring through Internet / Intranet and can be connected with other automation systems to realize the whole Bureau Management of the whole production process.
Liu Lei of Dalian University of technology studied the remote service system developed by ABB in Sweden and Fanuc in Japan. After analyzing their respective advantages and disadvantages, a remote monitoring system with both advantages is proposed and successfully applied to Xinsong sr6c industrial robot. Aiming at the establishment of socket and the development of multithreading technology, Zhang Aimin and others of Guangzhou CNC Equipment Co., Ltd. proposed the implementation process of industrial robot remote monitoring and diagnosis system based on TCP / IP protocol. Through this system, the position, running state and other relevant parameter information of on-site industrial robot can be viewed or modified anytime and anywhere.
On the basis of studying the traditional web-based industrial robot monitoring scheme, Zhou Li of Central South University proposed a robot remote monitoring system scheme based on CORBA and JSP / JavaBean technology, realizing the application of web technology and CORBA Technology in the field of industrial control [16]. Xu Qian of Jiangsu University has studied the integration of web server and industrial robot network control platform on embedded system. Operators can remotely monitor industrial robots through web browser.
Mei Xuhong of Hangzhou University of Electronic Science and technology proposed C / s for remote monitoring of industrial robots (client and server) mode. Yin Hongli of Central South University proposed an architecture based on Internet and sensor drive, so as to ensure no distortion of control information, reduce the action time difference between local simulated virtual industrial robot and remote real-time industrial robot, and combine remote monitoring and control friendly.
At present, industrial robot remote monitoring mainly realizes the remote monitoring function with the help of Internet-based remote monitoring technology, Internet communication technology, computer visualization technology and virtual reality technology. Industrial robot remote monitoring technology has a strong theoretical foundation and good technical support. However, in real life, the confidential data in remote monitoring and fault diagnosis may have potential security risks of leakage, tampering or loss. It is imperative to strengthen the data security research in industrial robot remote monitoring and fault diagnosis.
The collection, processing and fusion of industrial robot field signals is the basis of realizing industrial robot remote monitoring and fault diagnosis. After the on-site signal acquisition of industrial robot, the signals obtained from multi-sensor can not be directly used to evaluate, diagnose and predict the operation state of industrial robot. Because the amount of data of multi-sensor signals is large, there may be redundancy and contradiction between information, so it is difficult to analyze and apply directly. These signals must be processed, transformed and fused, Extract the signal eigenvalues that can accurately reflect the state of industrial robot. By establishing the mapping relationship between these signal eigenvalues and performance, life and fault, we can realize the reliable identification of the specific state of industrial robot. In terms of signal acquisition, David Alejandro et al. Proposed a new method to complete the signal acquisition of industrial robot vibration phenomenon by using accelerometer and gyroscope sensors.
Zhang Xingwu of China University of science and technology and others have designed an industrial robot intelligent signal acquisition and processing module with wide adaptability by using the signal acquisition and information processing technology with digital signal processing (DSP) as the core and combined with the design concept of modern intelligent sensor technology. Hu Xudong of Zhejiang University discussed the case of remote signal acquisition of industrial robot based on network. In terms of signal processing, Chen Xijun, Institute of automation, Chinese Academy of Sciences, and others proposed a method of using multiple DSPs to control and process all kinds of non visual sensors, and gave the principle and specific implementation process of sensor signal processing. Wang Jun of Huazhong University of technology and others introduced a high-precision multifunctional six dimensional wrist force sensor and its signal processing system for real-time detection of force / torque signals of mechanical wrist. Ma Yulong, State Key Laboratory of robotics, Shenyang Institute of automation, Chinese Academy of Sciences, discussed the application of colorless Kalman filter based on acceleration signal enhancement in robotics.
Yu along of Huaiyin Normal University applies multi wavelet transform to the signal denoising of industrial robot wrist force sensor. The floating threshold method is used to eliminate the noise. The wavelet transform method can process the signal more effectively, which has incomparable advantages over the traditional methods. Fu Yili of CIMS research center of Tongji University proposed a signal processing system based on digital signal processor (DSP) and complex programmable logic device (CPLD), which is suitable for real-time signal processing.
Based on the analysis of the signal characteristics of the chip, Cheng Li and others of Central South University for Nationalities proposed a signal decoding method, designed the corresponding algorithm, and implemented it in the specific industrial robot control system. In terms of signal fusion, scholars at home and abroad have conducted extensive research on multi-sensor signal fusion technology. At present, the representative methods in the field of multi-sensor signal fusion include weighted average, Bayesian estimation, Kalman filter, S-D reasoning, fuzzy logic and artificial neural network.
Patrik Axelsson et al. Developed a sensor signal fusion method for state estimation of flexible industrial robot. Guan Tianyun of Zhejiang University proposed a multi-sensor signal intelligent fusion system based on fuzzy integral theory, which was successfully applied to the fusion of non visual sensor signals of industrial robots.
It can be seen from the above literature that the methods of industrial robot signal acquisition, processing and fusion are gradually developing from the traditional single sensor to the digital signal processing system and more intelligent. The academic circles at home and abroad are in the stage of active thinking and exploration.
The proportion of China's renewable energy consumption has steadily increased
At present, renewable energy has become the main direction of global energy transformation, the main starting point to deal with climate change, an important force to promote sustainable global economic growth and universal employment, and its impact on the global energy pattern and geopolitics is becoming more and more obvious. Recently, the new energy chamber of Commerce of the all China Federation of industry and commerce, the Energy Research Institute of the national development and Reform Commission and the global energy policy center of Columbia University jointly held the "video exchange meeting on the latest energy policy between China and the United States". Zeng Shaojun, professional vice president and Secretary General of the new energy chamber of Commerce of the all China Federation of industry and Commerce and executive president of China New Energy Industry Research Institute, believes that during the 13th Five Year Plan period, China's renewable energy scale continues to grow rapidly, the proportion of renewable energy consumption has increased steadily, and has entered a new stage of higher proportion incremental substitution and regional stock substitution.
"From 2020 to 2025, China's renewable energy will basically realize parity on the Internet, and renewable energy will become the main body of energy increment in most regions." Zeng Shaojun said.
The new energy chamber of Commerce of all China Federation of industry and Commerce launched the Research Report on several major issues of China's new energy development in the 14th five year plan in July 2019. The report points out that accelerating the development of centralized and decentralized wind power, promoting the comprehensive and diversified development of solar energy, promoting the large-scale development of biomass, promoting the industrialized utilization of geothermal energy, building a multi energy complementary smart energy system and upgrading the supporting comprehensive pipe network infrastructure will become the main tasks of China's new energy development during the 14th Five Year Plan period.
At the same time, the "14th five year plan" period is a critical period for China's energy transformation and reform. We should innovate the renewable energy power development model in combination with energy transformation and power system reform, give full play to the decisive role of the market in resource allocation, and establish a number of comprehensive energy services and industrial integration demonstration projects focusing on enterprise model innovation; Give better play to the government's macro-control role, improve the renewable energy industry system, strive to promote industrial quality, efficiency and power changes, improve total factor productivity and enhance the core competitiveness of the industry.
The report proposes that China should strengthen international cooperation in an all-round way, fully grasp the new changes and trends of international energy cooperation, carry out more active and promising international energy cooperation, and build a global industrial chain cooperation system. "In general, the development of renewable energy is a strategic issue. It can not only be used as an important measure to deal with climate change, stimulate the economy and solve employment, but also use non-governmental diplomacy, especially through the exchange and cooperation of industry business associations, to jointly explore solutions to some major problems, which is helpful to further consolidate the consensus between China and the United States and make up for the differences in understanding problems Friction has a positive effect. " Zeng Shaojun stressed.