News

Electrical accessories, If you have any inquiries, please feel free to contact us.

Dear valued customers: Good day, As Labor Day holiday will coming , our office will be closed from 1st to 5th May. 2020. for a total of 5 days. Will recover work on 6th May.2020. Sorry for the inconvenience. Thanks & Best regards Fuzhou Singree Electric Co.,Ltd Fuzhou Singree Imp & Exp Co.,Ltd

Protect yourself and others around you by knowing the facts and taking appropriate precautions. Follow advice provided by your local public health agency. To prevent the spread of COVID-19: Clean your hands often. Use soap and water, or an alcohol-based hand rub. Maintain a safe distance from anyone who is coughing or sneezing. Don`t touch your eyes, nose or mouth. Cover your nose and mouth with your bent elbow or a tissue when you cough or sneeze. Stay home if you feel unwell. If you have a fever, a cough, and difficulty breathing, seek medical attention. Call in advance. Follow the directions of your local health authority. Avoiding unneeded visits to medical facilities allows healthcare systems to operate more effectively, therefore protecting you and others.

Dear valued customers: We would like to let you know,the goods are risk-free! First, the virus is mainly transmitted from person to person through contact and droplets. So far, there have been no cases of infection from objects. Second, WHO issued a special notice stating that packages and cargo were not at risk of infection. Not to mention cross-border trade. Third, our government has taken strong measures to prevent the spread of the virus, even extending holidays and suspending some industrial production. The area where our factory is located is not a major outbreak area. and none of our employees are sick. So please don't worry. Should you have any questions , please feel free to contact me. Warm regards Fuzhou Singree Electric Imp & Exp Co.,Ltd

Dear valued customers: We would like to take this opportunity to thank you for your kind support all this while. Please kindly be advised that our company will be closed from Jan 23th to Jan 30th,2020, to commemorate traditional Chinese festivals,Spring Festival . Any orders will be accepted but will not be processed until Jan 31th, 2020, the first business day after the Spring Festival. Sorry for any inconvenience caused. Thanks & Best regards

Dear valued customers: We would like to take this opportunity to thank you for your kind support all this while. The 2019 National Day holiday arrangement will be adjusted to Oct 1st to 7th, 2019, for a total of 7 days. Please kindly be advised . Any orders will be accepted but will not be processed until Oct 8th, 2019, the first business day after the National Day holiday. Sorry for any inconvenience caused. Thanks & Best regards Fuzhou Singree Electric Co.,Ltd

Dear valued customers: We would like to take this opportunity to thank you for your kind support all this while. The 2019 Mid-Autumn Festival holiday arrangement will be adjusted to Sep 13th to 15yh, 2019, for a total of 3 days. Please kindly be advised . Any orders will be accepted but will not be processed until Sep 16th, 2019, the first business day after the Mid-Autumn Festival holiday. Sorry for any inconvenience caused. Thanks & Best regards "Zhong Qiu Jie", which is also known as the Mid-Autumn Festival, is celebrated on the 15th day of the 8th month of the lunar calendar. It is a time for family members and loved ones to congregate and enjoy the full moon - an auspicious symbol of abundance, harmony and luck. Adults will usually indulge in fragrant mooncakes of many varieties with a good cup of piping hot Chinese tea, while the little ones run around with their brightly-lit lanterns. Mooncakes are to Mid-Autumn Festival what mince pies are to Christmas. The seasonal round cakes traditionally have a sweet filling of lotus seed paste or red bean paste and often have one or more salted duck eggs in the center to represent the moon. And the moon is what this celebration is all about. Mid-Autumn Festival falls on the 15th day of the 8th month; it is the time when the moon is said to be at its brightest and fullest.

Due to the high mechanical strength of the surface layer of the tempered glass insulator, cracks are less likely to occur on the surface. The electrical strength of the glass generally remains constant throughout the operation, and its aging process is much slower than that of porcelain. Therefore, the glass insulator is mainly scrapped due to self-damage, which occurs during the first year of operation, but the defects of the porcelain insulator are only in operation. It was only discovered after the year. The creepage distance, structure and material of the pin insulator are closely related to the flashover voltage. Under normal circumstances, the flashover voltage increases with the increase of the creepage distance. The structural shape of the insulator directly affects the antifouling performance of the insulator, and the reasonable structural design has a smooth surface, is not easy to form eddy currents, and has a small amount of accumulated dirt, thereby increasing the flashover voltage. The polymer organic composite material is used because of its large shape coefficient, large surface resistance and good water repellency, and good antifouling performance. Therefore, in the selection of insulators, the geometric creepage and structure must be reasonably selected according to the specific conditions, and new composite technology is used to actively promote the use of composite insulators. The glass insulator insulator is an insulator made of tempered glass. The surface is in a state of compressive prestressing. If cracks and electrical breakdown occur, the glass insulator will break into small pieces by itself, commonly known as "self-explosion." This feature eliminates the need for "zero value" detection of the glass insulator during operation. Composite insulators are also called composite insulators. The insulating member is composed of a glass fiber resin core rod (or core tube) and an insulator of an organic material and an umbrella skirt. The utility model has the advantages of small size, light weight, high tensile strength, excellent anti-pollution and flashover performance. But anti-aging ability is not as good as porcelain and glass insulators. Composite insulators include: rod-shaped suspension insulators, insulated cross-arms, post insulators, and hollow insulators (ie, composite sleeves). Composite bushings can replace porcelain sleeves used in a variety of electrical equipment, such as transformers, surge arresters, circuit breakers, capacitive bushings and cable terminations. Compared with the porcelain sleeve, it has the advantages of high mechanical strength, light weight and small dimensional tolerance, and can avoid damage caused by blasting. Since some enhancers are located upstream of the promoter and some are downstream, the effect of the insulator does not depend on the relative position of the insulator to the promoter. Therefore, the reason for the directionality of the insulator effect has not really been clarified. It has now been found that two loci affect the function of the insulator in a transactivation manner. The white identification insulator encoded by the gene S2J (Hw) has an insulating effect only after it is combined with the insulator. When the gene was mutated, although an insulator was inserted into the y locus, the insulation was lost and y was expressed in all tissues. Another locus is mod (mdg 4). After mutation, the effect of this gene is opposite to that of Su(Hw), that is, these mutants enhance the insulation and expand the insulation effect of the insulator without directionality. That is, blocking the effects of enhancers on both the upstream and downstream sides. There is an explanation that the first is Su (Hw) combined with the insulator DNA, so that the insulator has an insulating effect. Mod(mdg4) is combined with Su(Hw) to lose the insulation effect of the insulator; the mutated mod(mdg4) cannot be combined with Su(Hw), so the insulator enhances the insulation. A few hundred nucleotide pairs in length are a regulatory sequence usually located between a promoter and a positive regulatory element (enhancer) or a negative regulator (which is heterochromatin). The insulator itself has neither a positive effect nor a negative effect on the expression of the gene, and its function is simply to prevent other regulatory elements from acting on the activation or inactivation effects of the gene.

At present, China's ultra-high pressure and ultra-high voltage power grids have become a prominent symbol of rapid economic and social development. The sights of line towers, wire racks and wire nets are quite spectacular. However, what is not known is the achievement of power. Among the elements of the Great Wall, there is a small thing that is vital and often overlooked. It is an insulator. Without an insulator, there is no high-voltage power grid. As a porcelain bottle weighing more than ten kilograms to several tens of kilograms, the appearance of the insulator is really inconspicuous, but the technology it contains is extremely rich. As an important part of the substation and high-voltage transmission line infrastructure, the insulator bears three major tasks: insulation, support and mechanical connection. In ultra-high-voltage transmission lines, the voltage can exceed 1 million volts, and the transmission cable between the two towers exceeds 15 cm in diameter, which can generate more than 50 tons of tensile force. These high-voltage and strong tensile forces must first It is assumed by the insulator. Porcelain insulators need to pass through raw material inspection, batching, ball milling, sieving, iron removal, pulping, granulation, billeting, glazing, firing, magnetic inspection, cutting and grinding, etc. Aiming at the requirements of the use of UHV power grids in China, it is the core performance of insulator products to withstand millions of volts and tens of tons of tensile force. It is also the main technology research and development direction of Jingcheng insulators.

Glass insulator insulator is made of tempered glass insulator. The surface is in a state of compressive prestressing. If cracks and electrical breakdown occur, the glass insulator will break into small pieces by itself, commonly known as "self-explosion." This feature eliminates the need for "zero value" detection of the glass insulator during operation. The main chain of silicone rubber is composed of a siloxane (Si-O) chain. Since the electronegativity of Si and O on such a bond is greatly different, the polarization structure formed has an ionic bond property. Thus, the bond energy of Si-O is higher than that of C-C bond. In addition, 1. Due to the nature of the ionic bond of the main chain, the ionic properties of the side chain methyl C-H are weakened and are not easily attacked by other molecules, so the chemical stability is good; 2. Since Si does not form double bonds and triple bonds, it is difficult to form a starting point of decomposition of the main chain (for this reason, the Si-C bond is relatively stable), which in turn leads to a more stable main chain of the silicone rubber. Based on the establishment of the above model. The researchers of CJCELE also established a finite element model for the ice-column insulators and an improved finite element model for the open-field problem of the insulators using KelV, n-transformation. These models have certain guiding significance for solving the electric field problem of ice-covered insulators. However, these models not only have to be improved in modeling, such as not considering the change of electric field distribution when the arc occurs, the conductivity of water film and the effect of ice coating on the electric field distribution of ceramic insulators; It is only the model of the post insulator. In the calculation of the electric field along the surface of the ice-suspended insulator series composite insulator, the electric field calculation model of the wide 3-1 ice-covered insulator can not be simply used in summer. Pillar insulators are mainly used for insulation and mechanical fixing of busbars and electrical equipment in power plants and substations. In addition, post insulators are often used as part of electrical equipment such as disconnectors and circuit breakers. Among the post insulators, it can be further divided into a pin post insulator and a bar post insulator. Pin-type post insulators are mostly used in low-voltage distribution lines and communication lines, and rod-shaped post insulators are mostly used in high-voltage substations. Insulators can be divided into suspension insulators and post insulators according to different installation methods. According to the different insulation materials used, they can be divided into porcelain insulators, glass insulators and composite insulators (also called composite insulators). According to different voltage levels, they can be divided. Low-voltage insulators and high-voltage insulators; according to the different environmental conditions used, the pollution-resistant insulators used in the contaminated areas are derived; DC insulators are derived according to the type of voltage used; there are various special-purpose insulators, such as insulated cross-arms, Semiconductor glaze insulators and tensioning insulators for distribution, bobbin insulators and wiring insulators. In addition, according to the different possibility of breakdown of the insulating member, it can be divided into two types: the A type, that is, the non-breakable type insulator and the type B, which can be the breakdown type insulator. With glass insulators, it is possible to eliminate the periodic periodic preventive test of the insulator during operation. This is because every damage to the tempered glass will cause damage to the insulator, which is easy for the operator to find when patrolling. When the insulator is damaged, the glass fragments near the steel cap and the iron foot are stuck, and the mechanical strength of the remaining portion of the insulator is sufficient to prevent the insulator string from breaking off. The self-breaking rate of glass insulators is one of the important indicators to measure product quality, and it is also the quality basis for the evaluation of bidding and bidding in current transmission projects.

With the accelerated pace of energy interconnection, the planning and construction of UHV is getting better and better. As an insulator that plays an important role in overhead transmission lines, the significance in the field of high-end power equipment manufacturing is self-evident. To this end, electrical manufacturing companies have promoted the development of the insulator industry from extensive manufacturing to intelligent manufacturing, and promoted the structural adjustment of the insulator manufacturing industry, from high energy consumption, labor-intensive, to low-energy, intelligent equipment. Glass insulator into the main force of UHV lines According to different production processes, insulator products currently used in the market include composite insulators, glass insulators, porcelain insulators, and the like. The glass insulator insulating member is composed of a glass fiber resin core rod (or a core tube) and a sheath of an organic material and an umbrella skirt. The utility model has the advantages of small size, light weight, high tensile strength, excellent anti-pollution and flashover performance. There are relatively many glass insulators applied on China's DC and AC UHV lines. Domestic enterprises have achieved independent innovation through years of technical reserves and experience accumulation, and glass insulator products have significant advantages. First, the strength is higher, second, the anti-pollution ability is stronger, and third, the self-explosion rate is low. This feature eliminates the need for [zero value" detection of the glass insulator during operation, ensuring safe operation of the grid. In recent years, China's power industry has developed rapidly, and the installed capacity of generators has increased year by year. As an indispensable part of power transmission and transformation equipment, insulators are inseparable from the development of the power industry. Meeting new opportunities in the insulator market According to the statistics of relevant departments, since 2004, the main business income of major enterprises in China's insulator industry has continued to grow rapidly. With the improvement of the technical level of China's insulation products manufacturing industry and the accelerated economic development of countries such as East Asia and South Asia, major domestic enterprises Seize the opportunity and actively explore the international market, the export delivery value of the industry has increased year by year. The power industry is the most important application market for insulator arrester products. The launch of many power projects in China at present has not only provided a broad market space for the development of the insulator arrester industry, but also put forward new requirements for the industry product market and promoted The adjustment of the market structure of insulator arrester products and the research and development of new technologies. Insulators are mainly used in the power grid field. The construction of [smart grid" will bring huge development opportunities for the insulator industry. First, a large amount of investment will provide a broad market space for the industry. Secondly, the upgrading of power grid construction will help the industry to optimize and integrate, form a new competitive landscape, and guide companies with new technologies, new materials and new products to obtain more. Large market space, so that there are more resources to support technological innovation, continue to drive industry upgrades and progress. The large-scale investment in power grid construction provides a fundamental guarantee for the development of the insulator industry. In addition, the construction of electrified railways and the continuous expansion of overseas markets have also provided new market opportunities for the insulator industry. Based on the development level of the global power industry and investment planning, experts predict that the overall demand of the global insulator industry will maintain steady growth. Due to the continuous improvement of the reliability and economic requirements for the insulation of substations and overhead transmission lines, more insulator manufacturers will continue to invest in R&D around customer needs and continue to advance the industry.

Main functions and advantages of FXB-35/70CT composite insulators. Stain-resistant insulators mainly adopt measures to increase or increase the insulator shed or umbrella edge to increase the creepage distance of the insulator to improve the electrical strength of the insulator. At the same time, the shape of the shed structure is also changed to reduce the amount of natural dirt on the surface to improve the anti-smudge performance of the insulator. The creepage ratio of the stain-resistant insulator is generally 20% to 30% higher than that of the ordinary insulator, or even more. In areas where the power grid is frequently flashed, it is customary to use a double-layer umbrella structure with a stain-resistant insulator. This insulator has a strong self-cleaning capability and is easy to clean manually. According to our investigation of insulators used in overhead lines, pin insulators, butterfly insulators, suspension insulators, porcelain crossarms, rod insulators, LXY-70 glass insulators and tension insulators are commonly used. We produce complete specifications of insulators. In general, electrical faults of insulators are flashover and breakdown. Flashover occurs on the surface of the insulator, and burn marks are visible. The insulation performance is usually not lost. The breakdown occurs inside the LXY-70 glass insulator, and the ceramic body is discharged through the iron cap and the iron foot. The appearance may not be traced, but it has been lost. Insulation properties may also cause complete destruction of the insulator due to arcing. For breakdown, attention should be paid to checking the discharge marks and burns of the iron feet of the LXY-70 glass insulator. After a flashover occurs, the voltage between the electrodes drops rapidly to zero or close to zero. Sparks or arcs in the flashover channel cause localized overheating of the insulating surface to cause charring and damage to the surface insulation. We caution that safety must be taken into account during use or maintenance. 1) In terms of the microscopic morphology of the crust-breaking mandrel: on the surface of the broken mandrel, it is observed that the glass fiber is broken, the glass fiber and the epoxy resin matrix are separated from each other, the epoxy resin matrix is corroded, and the residue remains. "Stomach" and "bubble" phenomenon appear on the epoxy resin matrix on the surface of the glass fiber; on the section of the broken core fiber surface of the broken mandrel, it can be observed that the single glass fiber section is not a complete circular shape, glass The fiber section is flat and the interface failure between the glass fiber and the epoxy resin matrix can be observed. With glass insulators, it is possible to eliminate the periodic periodic preventive test of the insulator during operation. This is because every damage to the tempered glass will cause damage to the insulator, which is easy for the operator to find when patrolling. When the insulator is damaged, the glass fragments near the steel cap and the iron foot are stuck, and the mechanical strength of the remaining portion of the insulator is sufficient to prevent the insulator string from breaking off. The self-breaking rate of glass insulators is one of the important indicators to measure product quality, and it is also the quality basis for bid evaluation at the current transmission engineering recruitment and bidding. Product structure: The product consists of iron cap, tempered glass and steel feet, and is glued together with cement glue. This product is all made of a cylindrical head structure, which is characterized by a small head size. Light weight, high strength and large creepage distance. It can save metal materials and reduce the cost of the line. In order to meet the needs of live working, the traditional structural shape of the domestic is adopted on the brim. Suspension insulators are widely used in the insulation and mechanical fixing of high-voltage overhead transmission lines and soft and busbars of power transmission and distribution. In the suspension insulator, it can be further divided into a disc-shaped suspension insulator and a rod-shaped suspension insulator. Disc suspension insulators are the most widely used insulators for transmission lines.

Mechanical properties: Glass insulators are often subjected to the forces of gravity and tension of the wires, wind, ice weight, glass insulator weight, wire vibration, equipment operating mechanical forces, short-circuit electric power, earthquakes and other mechanical forces during operation. The relevant national standards have strict requirements on mechanical performance. For the mechanical properties of glass insulators, it is necessary to ensure that the glass insulator can withstand the gravity and tension of the wires and withstand different resistances, so that the glass insulators have good use value in different uses. Pin insulators often encounter many problems in use, affecting the normal use performance and value of the pin insulators. Therefore, they are tested according to certain methods and methods during use, and often analyze the faults that occur. The causes and influencing factors of the failure of the pin insulator: Although other polymer materials also have the advantages described above, only silicone rubber does not cause too much pollution to the environment. The polymer insulator can be made waterproof, so that leakage and surface arcing occur due to water drop. Silicone rubber insulators are more resistant to water than other polymer insulators and are durable materials that can be used in harsh environments for long periods of time. In the power system, due to various reasons, such as single-phase grounding, long-line capacitance effect and load shedding, etc., it will cause the power frequency voltage to rise or generate a transient over-voltage with a higher amplitude. Therefore, the arrester has a certain tolerance within a certain period of time. The degree of power frequency voltage rise capability, which is the power frequency overvoltage withstand time characteristic of the arrester. Pin insulators are the oldest insulators in high voltage transmission and distribution lines. Due to its simple manufacture, low cost, easy installation and reduced tower height (supreme installation of insulators, grounding part is below), it is widely used in ordinary areas where the nominal voltage of three-phase power system is 6-35kV and the frequency does not exceed 100Hz. In the area of high-voltage overhead power lines, used for insulation and support wires.

The main technical indicators of the insulator industry are: Mechanical strength and degradation rate. In terms of mechanical strength, the highest mechanical strength of the Class 3 insulators has reached the 550kN strength class. The mechanical margin of porcelain insulator and glass insulator of 240kN strength grade and below is generally 1.2-1.4, the mechanical margin of 300kN-420kN is generally 1.2-1.3, the mechanical margin of 550kN insulator is generally 1.1-1.2, and the strength grade of each strength grade Composite insulators have a mechanical margin of 1.4-1.5 or even higher. In terms of deterioration rate, the annual average degradation rate of porcelain insulators and glass insulators is generally 0.2% or more. At present, the annual average degradation rate of porcelain insulators and glass insulators of domestic mainstream manufacturers is about 0.01%-0.005%; The annual average degradation rate is about 0.03%, and it is decreasing year by year. With the continuous accumulation of industry operating experience and continuous improvement of manufacturing levels, the manufacturing technology of the domestic insulator industry has been at the international leading level. With the construction of China's unified joint power grid and the application of more ultra-high voltage and ultra-high voltage transmission lines, the market demand for technical performance such as reliability, pollution resistance and dispersion of electromechanical damage values of insulator products will become higher and higher.

According to different production processes, insulator products currently used in the market include composite insulators, glass insulators, porcelain insulators, and the like. The glass insulator insulating member is composed of a glass fiber resin core rod (or a core tube) and a sheath of an organic material and an umbrella skirt. The utility model has the advantages of small size, light weight, high tensile strength, excellent anti-pollution and flashover performance. According to industry insiders, there are nearly 200 line insulator manufacturing enterprises in China, and about 40 companies with a certain production scale. More than 100 countries in the world have used tempered glass insulators, more than 200 million pieces. Due to the accelerated construction of the power grid, compared with porcelain insulators, the development of domestic glass insulators is more rapid, and its market is in short supply, which continues to attract other companies to compete in this field. "At present, there are relatively many glass insulators applied on DC and AC UHV lines in China. Domestic enterprises have achieved independent innovation through years of technical reserves and experience accumulation. The advantages of glass insulator products are remarkable. First, the strength is higher, and the second is anti-pollution flash. The ability is stronger, and the third is the low self-explosion rate." The person in charge of an insulator manufacturing company said that this feature makes the glass insulators do not need [zero value" detection during operation to ensure safe operation of the grid. In recent years, China's power industry has developed rapidly, and the installed capacity of generators has increased year by year. As an indispensable part of power transmission and transformation equipment, insulators are inseparable from the development of the power industry. In view of the practical problem that China's insulator equipment still has a certain gap with foreign countries in manufacturing technology, domestic insulator manufacturing enterprises continue to improve their research and development capabilities, and always regard independent innovation as the inexhaustible motive force for sustainable development, and adhere to the road of independent brand development.

High voltage insulator classification and use Insulators can be classified into high voltage insulators and low voltage insulators according to the voltage used. Insulators can be divided into porcelain insulators, glass insulators, and organic material (epoxy-resinated) insulators according to manufacturing materials. Insulators can be divided into indoor and outdoor insulators according to the location of their installations. Insulators can be divided into 11 sub-categories and 48 series according to their structures and applications. The main purpose of high-voltage insulators 1) High-voltage line insulators 1 High-voltage line rigid insulators: including pin-type porcelain insulators, porcelain cross-arm insulators and butterfly-type porcelain insulators. High-voltage circuit porcelain crossarm insulator can be divided into all-ceramic, rubber-mounted, single-armed and V-shaped according to the structure; according to the installation can be divided into vertical and horizontal two; by 50% full-wave impact flash The network voltage can be divided into 185kV, 2lOkV, 280kV, 380kV, 450kV, 6lOkV and other levels. For high-voltage overhead transmission and distribution lines, can replace the needle and suspension insulators, and save high pole porcelain dan. The high voltage line butterfly porcelain insulator is divided into 6kV, lOkV two levels according to the rated voltage. Used for overhead power transmission and distribution line terminals, tension and corner bars for insulation and fixed conductors. At the same time, it is also widely used as a component with line suspension insulators as a component of the line fittings to simplify the fitting structure. 2 High-voltage line suspension insulators : including disc-suspended porcelain insulators, disc-suspended glass insulators, ceramic puller insulators, and ground insulators. High-voltage line disc suspension ceramic insulators are divided into ordinary type and stain resistant type. For high voltage and extra high voltage transmission lines for hanging or tensioning conductors and insulating them from tower masts. Suspension insulators have high electromechanical strength and can be applied to various voltage levels through different strings. They are suitable for various strength requirements and are most widely used. The common type is suitable for general industrial areas. Comparing with ordinary type insulators, the stain-resistant type has a larger creepage distance and is convenient for weather-and-rain cleaning, and is suitable for coastal areas, metallurgical powders, chemical contamination, and more serious industrial pollution areas. When the stain-resistant insulators are used in the above areas, the size of the towers can be reduced, which has great economic value. The use of high-voltage line disc suspended glass insulators and high-voltage line disc high voltage insulators is basically the same. The glass insulator has the characteristics of high mechanical strength, resistance to mechanical impact, good cold and heat performance, long life, excellent electrical performance and lightning resistance, and the umbrella tray is automatically broken and easy to be found during operation damage, greatly reducing the amount of insulation detection work. . The high-tension porcelain insulator rod insulators are used in terminal tension and corner posts on lOkV and below overhead power lines for insulation and fixed conductors. It can be used instead of some butterfly porcelain insulators and disc-suspended porcelain insulators. Related Information High Voltage Insulator Model http://?id=5 Overvoltage protector http://?id=4 One elimination device http://?class_id=2 Lightning arrester online monitor http:// High voltage arrester http://?class_id=1 High voltage fuse model http://?class_id=3 Insulation jacket http://?class_id=9 Surge Arrester Online Monitor http://?class_id=5 Monitor 10KV overvoltage protector http:// High-voltage insulator http:// Overvoltage protector http:// Composite insulator http://?class_id=7 Lightning Protection Technology http://?id=53 Lightning knowledge http://?class_id=4 The role of overvoltage protector http://

The glass insulator salt spray test method generally indicates coastal pollution in nature, and can also indicate industrial pollution, such as the case of thin layer pollution and moisture. The droplet size and distribution of the mist should be similar to the typical droplets of nature. Characteristics of the salt spray method: (1) A film containing an aqueous solution of sodium chloride can be cast on the surface of the insulator during the test. (2) It is not necessary to apply a contaminated layer to the insulator separately and one by one. (3) The formation of the mist can be easily automated. The salt on the surface of the insulator can be continuously replenished or the uneven dry salt layer can be uniformly wetted during the test, so the test state is easy to control. (4) The equipment required for the test is simpler than other test methods, but requires a corrosion-resistant, effectively sealed room that does not allow salt spray to escape. (5) The test preparation time is short, and the test period is relatively long. (6) The results obtained in the laboratory are in good agreement with the results in the natural environment. The salt spray solution of the salt spray test method is prepared by using sodium chloride and tap water according to the required salinity, and the salt solution is atomized by a compressed air flow, and the salt spray is sprayed through the nozzle. The test was started when the ceramic insulator was wetted to saturation. When applying voltage, the preliminary test is carried out by the lifting method, and then the tolerance test is performed later. Specific requirements are as follows: A preliminary test was carried out by the lifting method. The insulator is applied with a test voltage for 20 min under the test salinity; if it is not flashover, the voltage is stepped up by 10% test voltage every 5 min until flashover. After flashover, reapply the voltage and raise it as fast as possible to 90% of the previously obtained flashover voltage, then increase it by 5% of the flashover voltage every 5 minutes until flashover. The final boosting process should be Repeat 6 times, each time the voltage is rapidly increased to 90% of the flashover voltage obtained last time, and then stepped up to the flashover with a step of 5% every 5 minutes. After 8 flashovers, the mist was removed, the insulator was washed with tap water, and the tolerance test was performed as soon as possible. After the preliminary test is completed, the test sample is added with a given test voltage, the salt solution pump and the air compressor are actuated, and a series of tests are carried out according to the specified salinity. If no flashover occurs, then each test is performed. The duration should be th. When no flashover occurred during the three consecutive tests, the insulator was considered to have withstood. If only one flashover occurs, the fourth test shall be carried out, and no flashover will occur, and the composite insulator is considered to have passed the test. If the purpose of the test is to determine that the insulator is tolerant to the specified salinity value, then: 1 If the total number of flashovers at any salinity reaches 2, no further tests should be performed at the same or higher salinity. 2 If the total number of tolerances reaches 3, no further tests should be performed at the same or lower salinity. If the purpose of the study is to determine the resistance characteristics of the insulator, the maximum withstand voltage or 50% withstand voltage should be measured at a given test salinity. When measuring the maximum withstand voltage, each test should be selected in several voltage levels, each of these voltage levels should be approximately 1.05 times lower than the lower one. Each test is carried out according to the specified procedure, ie: 1 if the total number of flashovers at any voltage reaches 2, no further tests should be performed at the same or higher voltage levels; 2 such as tolerance at any voltage The total number of times reaches 3 and no further tests should be performed at the same or lower voltage levels. When measuring 50% withstand voltage, the insulator shall be subjected to at least 10 "effective" tests at a given test contamination level, and the applied voltage level at each test shall be changed by the lift method. The voltage level difference should be approximately 10% of the expected 50% withstand voltage.