In October, our company organized all employees to conduct a 2-day outdoor development training at the Qingyang Mountain Outdoor Development Base.   The two-day journey allowed everyone to relax in the usual stressful work, gained happiness and friendship, and deepened the feelings between family members. Colleagues in various departments have a better understanding of each other, which will make our later work more smoothly. This outdoor expansion activity has experienced team generation, display, and integration. Each team member saw the strengths and weaknesses of the team. After experiencing the joy of success brought by communication, collaboration, and execution, everyone also deeply felt Jinli people "gathering is a fire, scattered is the sky full of stars", each of our family members strive to shine in their respective jobs, and continue to provide a strong guarantee for the company's sustainable development.

  Metal oxide varistor (MOV) is a semiconductor element with unique grain boundary structure. Its resistance value decreases sharply with the increase of voltage. It has the advantages of excellent nonlinear volt-ampere characteristics, high current capacity, low residual voltage, no freewheeling and low cost. It has been preferred to be used in power supply and signal port as over-voltage protection components.   Although the current capacity of the MOV itself is large, the energy capacity is not large, that is, its rated continuous power is very small. The commonly used MOV rated power is generally at the mW level, which cannot withstand the constant current. For example, when MOV runs in U=53V circuit, the leakage current is 100μA due to aging. According to P=UI, substituting U=53V and I=100μA, the calculated heating power consumption is 5.3mW, which is the same level as the power of MOV itself. When the MOV leakage current reaches the milliampere level, it is enough to exceed the continuous power that it can withstand, which will cause combustion problems. To the burning problem caused by the failure of MOV, the current mainstream industry adopts the blocking method, which has many shortcomings and cannot achieve the purpose of truly solving the burning problem of MOV. The latest research technology adopts sparse methods to prevent and deal with warnings in advance, so as to truly eliminate the burning problem of MOV. At present, Anhui Jinli conducts in-depth experimental research on two aspects of abnormal temperature and abnormal leakage current.

In recent years, with the increase in the number of quality-guaranteed fans produced by major complete machine manufacturers, the demand for technical transformation and upgrading in the post wind power market has increased explosively. From the perspective of maximizing the owner's income, the overall improvement plan for the safety and efficiency of the wind farm is proposed.  The overall improvement plan is mainly divided into four parts, namely: the safety performance improvement of wind turbines; data analysis and pre-diagnosis; fault handling system upgrade; power generation increase. The four parts can be carried out independently, but they do not exist completely independently. They are interrelated and organically unified. The owner has strong demand for the improvement of fan safety performance and power generation. Now data analysis, pre-diagnosis and fault handling system upgrading can not only help owners understand the operation of wind farm and improve operation and maintenance efficiency, but also promote wind turbine safety performance and power generation, which is realized by more and more owners. At present, there are many manufacturers providing technological transformation programs for the aftermarket of wind power,, but some companies inevitably have follow-up hidden dangers due to the small number of technical teams, strong professionalism but not comprehensive enough. For example, there is no ability to check and verify the load of the whole machine while improving the power generation of the fan, high voltage ride through and pitch system, which may affect the safety of the fan in its life cycle. Therefore, it is necessary for the owners to carefully choose the technological transformation plan.

  Globally, billions of lightning strikes occur every year. If the electric vehicle is charging when a nearby lightning strike occurs, it is very likely to cause damage to the electric vehicle. This is because the conventional dielectric strength of electric vehicles only reaches 2500V, but when a lightning strike occurs, a high voltage of 20 times this will be generated. As an expert in lightning protection, surge protection, and safety equipment, Jinli Electric provides support for the sustainable development of the electric vehicle industry and protects your investment by providing comprehensive protection devices.

  At the 2021 annual meeting of the International Electrotechnical Commission IEC/SC37A "Low Voltage Surge Protective device (SPD)" held a few days ago, Chinese first international standard proposal in the field of IEC low voltage surge protective devices was approved, and its name and number are: IEC TS 61643-05 "Low voltage surge protective devices-Part 05: Monitoring device of Surge protective devices (MDS)-Requirements and test methods".   Based on China's technical accumulation and long-term practice in the field of intelligent SPD, the project is a technical specification formulated for the main component of intelligent SPD - surge protector monitoring device. The main technical contents include: monitoring the performance index and working state of surge protectors (SPD), the performance requirements and test methods of the monitoring device (MDS) that communicates with the host computer.   The successful establishment of this international standard not only indicates that China's low-voltage surge protector technology has gained a leading position in the international standard, but also shows that the intelligent SPD products developed and marketed by Chinese manufacturers have been recognized by the international market. The standard will not only improve the technical response ability of China's lightning protection industry in the international trade market, but also become an important milestone for China to use advanced technology to ensure lightning protection public safety. Anhui Jinli Electric Tech. Co., ltd is a member unit of the National Lightning Arrester Standardization Technical Committee and the Sensitive Technology Branch of the Chinese Institute of Electronics, and pays close attention to the revision of IEC standards.

  Until August 26, 2021, many global mainstream distributed inverter brands such as Sungrow, Growatt, Ginlong (Solis) Technologies, Huawei, Aiswei, Goodwe, Hopewind, etc. have issued a statement that high current series inverters used in distributed scenarios have been fully marketed, and work together with ultra-high power modules to speed up distributed photovoltaic projects and reduce the hourly power cost, build a new ultra-high power distributed ecosystem to achieve more stable system and more power generation. With the advent of the era of affordable photovoltaics, the investment yield of new projects has become more challenging. Therefore, it is imperative to reduce the cost of photovoltaic systems and increase power generation.   At present, total 15 inverter manufacturers at home and abroad have distributed inverters matching 210 high-power modules in supply.  Anhui Jinli Electric Technology Co., Ltd., a leading lightning protection solution supplier in the photovoltaic industry, escorts the safe operation of the inverter. Further contribute to the realization of "carbon peak and carbon neutrality" and jointly build a community of human and natural life.

Photovoltaic power generation is emerging and becoming an important pillar to meet the global renewable energy supply.  Reliable lightning current/ surge protection device is necessary to prevent failures and improve the service life of inverters, so as to maintain the power generation of photovoltaic power generation system. SPDs must be installed at the key points of solar system to avoid high-cost equipment damage and downtime problems. Based on IEC62305 and IEC 64643, for solar system, DC 1500V, DC 1000V, DC 800V, DC 600V, DC 500V spd, are requested.

Jinli surge protection devices are widely used in domestic and foreign projects, and have won unanimous praise and feedback from customers.