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The role of photovoltaic anti-islet devices

         The State Grid has more specific regulations for distributed photovoltaic power plants, which are based on the installed capacity of the photovoltaic power and the transformer's own capacity, and installation of anti-islet devices . If no anti-islet is installed, the capacity of the connected PV can only be up to 25% of the transformer. If anti-islet equipment is installed, it can increase to 80% of the transformer. From this perspective, installing anti-islet devices is very important for distributed photovoltaic power plants and plays a very important role.

          First of all, the anti-islet device is in the form of a cabinet, which is different from anti-islet devices. Anti-island protection devices are generally installed in the grid-connected cabinets. When an abnormality occurs in the grid, the grid-connected switches are tripped. Therefore, there are active anti-islet and passive anti-islet in the concept of anti-islet. The anti-islet device is a power distribution cabinet. The core components inside are disturbance resistors, control components, anti-islet switches, etc. Its main function is to activate the anti-islet device if the 400V busbar still has power when the power grid loses power. The 400V bus voltage is disturbed by throwing in anti-islands, forcing the inverter to stop. Ensure the safety of maintenance personnel. The typical design specifications of the State Grid are shown in the figure below:

                            Photovoltaic anti-islet device system map

                                          Photovoltaic island protection device           

In general, the JP cabinets used by the State Grid are all three-way feeders. In this case, anti-islet devices are required to be equipped with three sets of switches for use. Generally used for low voltage 400V voltage level. If the voltage level is 10KV or higher, anti-islet protection should be used. Today, centralized photovoltaic power stations are gradually decreasing. Roof-type photovoltaic power stations are gradually increasing. Moreover, for most poverty alleviation projects, the installation capacity is relatively small and the installation is relatively dispersed, and most of them are used for public change. As a result, the immediate power grid has lost power. The inverter may also be in a state of power generation. This kind of isolated network operation is not allowed to exist. Therefore, if there is such a phenomenon in the power grid before the maintenance, the anti-islet will be immediately put into operation.

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Why is the anti-islanding protection device rcx-9390d used so well in low-voltage distributed photov

         With state support for new energy photovoltaic industry has been rapid development, the industry increasingly stringent acceptance standards, maximize efficiency and safety has become a core issue of the owners and two power companies are concerned, and network anti-islanding protection device is an important control element for photovoltaic power generation security assurance. Its rationality and reliability are also very important. Many people in the photovoltaic industry may know that the rcx-9390D photovoltaic island protection device has a particularly good reputation. Also very large, as a member of the industry, of course, also used, and really understand why the rcx-9390D anti-islanding protection device is so popular, the following author will elaborate on the rational design of the next rcx-9390D anti-islanding protection device

First we look at the functional design of the rcx-9390D anti-islanding protection device          Protective function:          01. Overvoltage (trip)          02. Low Voltage (Tripping)          03. Frequency too high (trip)           04. Frequency is too low (trip)          05. Frequency mutation (trip)          06. Reverse power (trip)          07. External Link 1 (trip)          08. System Failure (Alarm/Trip)          09. Automatic pressure closing          10. High frequency fault recovery closing              11. Low frequency fault recovery closing               12. High-voltage fault recovery closing             13. Low frequency fault recovery closing                14. Quick break (trip)          15. Limited Speed ​​Break (trip)          16 Overcurrent (trip)          17. Residual current protection (trip)           First, we look at the tripping function; overvoltage, low voltage, high frequency, low frequency, abrupt change of frequency, reverse power, three-phase current protection, residual current protection, this is easy to understand, that is, the photovoltaic system is in operation. The rcx-9390D anti-islanding protection device can immediately detect and send a trip command to the grid-connected switch to allow it to trip, thus ensuring the safety of the system and avoiding the explosion of the accident; then why design these functions? This requires in-depth understanding, first of all talk about high-frequency, low-frequency, high-voltage, low-voltage protection, because the photovoltaic generation with the strong light conditions, photovoltaic system frequency, voltage will also change, and the system can withstand The scope is one, if you do not control him, he will cause damage and impact on some equipment on the grid and photovoltaic side, but also seriously threaten the safety of the operation and maintenance personnel, and install rcx-9390D anti-islanding protection After installation, these problems will be solved fundamentally.           Second, we take a look at the closing function; there is pressure loss tripping, there is a pressure closing function; high frequency fault recovery closing, low frequency fault recovery closing, high pressure fault recovery closing, low frequency fault recovery closing, industry practitioners People may see that the rcx-9390D anti-islanding protection device has more high-frequency fault resuming closing, low-frequency fault resuming closing, high-voltage fault resuming closing, and low-frequency fault resuming closing closing compared to other products on the market. Function, but these four functions really help the distributed photovoltaic power plant solve a lot of troubles. Just mentioned above, the photovoltaic system may appear high-frequency, low-frequency, high-voltage and low-voltage trip in the system. Once the trip, the fault is lifted. Failure to close them in time will affect the overall efficiency of power generation. At the same time, manual closing will also increase the operating costs. The rcx-9390D anti-islanding protection device solves these problems well, resulting in high, low, and high frequencies. The low-voltage fault can be tripped in time. After the fault is removed, it can be closed in time, realizing the maximization of user interests.           Third, there may be many users who say that other manufacturers' equipment does not have a voltage-lost trip and does it have a press-closing function? Remember, do not think that the high, low frequency, high, low pressure fault recovery can be closed, because he is a loss of pressure trip, rather than high, low frequency, high, low voltage trip, the function of these two is not the same thing, so Never be deceived by unprofessional manufacturers.           Fourth, many users may ask why they cannot switch on after tripping of the current protection during the three segments. I once asked this question. Later, the rcx-9390D anti-islanding protection device R&D technology and I said that 1. The voltage is low. Mostly, the grid is in a fault state, the access point's power grid is disconnected, and the grid is under maintenance. When the inspection is completed, the power supply is resumed, and the switch can be automatically closed. 2. High voltage For photovoltaic power plants, the transient voltage of the power grid is often high, or lightning strikes and other reasons. However, the power grid is relatively stable and will return to normal in an instant, so the switch can be automatically closed. 3, high frequency and low frequency, this problem is also mostly the fluctuation of the power grid (does not rule out the transformer failure, in a project in Jilin, and after one month of grid-connected island protection device always high-frequency trip, after checking the reason is the transformer failure Therefore, according to the actual situation, the grid-connected switch can also reclose itself. 4, current quick-break protection, over-current protection and residual current protection. When over-current protection occurs, this generally causes over-current protection to be mostly caused by a two-phase or three-phase short circuit. This is a serious power failure and must be tripped and cannot be re-closed. The appearance of the residual current shows that the three-phase current appears unbalanced, and when the protection setting value is reached, the switch must also trip. Avoid causing big faults.           These solutions instantly made me understand their professionalism. Also let us understand the rationality of the rcx-9390D anti-islanding protection device design, it can be said that it is really from the perspective of safety, from the perspective of efficiency, standing on a professional point of view to solve the problem of photovoltaic grid connection, Using this product also really saved me a lot of things. The design of device functions does not require blind roots, but it requires meaningful solutions to practical problems. This requires understanding of the operating conditions of photovoltaics in order to design a reasonable product. This is also an anti-islanding protection device rcx-9390d. Why is such a good reason used in low voltage distributed photovoltaic systems?

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In 2017, the company won the bid for the island project

In 2017, the company won the bid for the big projects won

    In February 2017, the company successively won the bidding for dozens of RCX-9390D photovoltaic power projects in Tianyu County of the State Grid; RCX-9590D low voltage anti-islanding device for photovoltaics ;     In April 2017, the company won the bid for more than 100 sets of PVX Poverty Reduction Projects of State Grid Nanyang Power Supply Company in the same month; RCX-9390D; RCX-9590D photovoltaic island protection device;     In May 2017, the company successively won over 100 sets of RCX-9390D photovoltaic island protection devices in Zhaoxian, Xinji and Pingshan County in Shijiazhuang;     In June 2017, the company has successively installed more than 100 sets of RCX-9390D photovoltaic anti-poor and anti-islanding protection devices in Chicheng County, Kangbao County, and Yangyuan County;     In June 2017, the company won the bidding for more than 200 sets of RCX-9390D photovoltaic anti-islanding protection devices from Cao County Power Supply Company in one time.     In June 2017, the company successively won bids for more than 120 sets of RCX-9390D photovoltaic anti-islanding protection devices in Jinhua Pujiang;     In July 2017, the company successfully won several bids for rcx-9390D photovoltaic anti-islanding protection devices in Ningbo area.      In August 2017, the company successively won the bid to install dozens of RCX-9590D photovoltaic island protection devices in Qixia and Laiyang in Yantai;      In September 2017, the company successively won bids for dozens of sets of RCX-9390D in Inner Mongolia region; RCX-9590D photovoltaic low voltage anti-islanding device;     In October 2017, the company won the bid for 100 sets of RCX-9390D photovoltaic low voltage anti-islanding device in Zhumadian, Henan     In November 2017, the company successively won the bidding for Sunny Island Solar, Solar Energy, Zhengtai Group, Hunan Wesson, and Xiamen Hongfa dozens of RCX-9590D island protection devices; In addition, in 2017, the company also successively won 27 VIP-9590Ds from Liuhe Power Supply Company of State Grid, more than 20 sets of VIP-9590D in Chengde, and more than 30 sets of RCX-9390D and RCX-9590D from Xingjin County and Xingtai County; Some few small projects are countless bases

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Photovoltaic anti-isolating device use FAQ

         In small distributed photovoltaic power plants, the national grid requires the installation of anti-islanding protection devices . As a low-voltage microcomputer protection, it has many differences compared to conventional high-voltage protection. However, it is similar.

Question one: installation problems          Under normal circumstances, the installation of anti-islanding protection devices, no matter whether they are conventional 380V grid-connected or 10KV grid-tied, are all installed on the side of grid-connected switches. The presence of faults can be determined by detecting the grid voltage conditions. However, some situations are different. There are several branches under a transformer, and several branches are summarized by the power grid cabinet and then to the grid. In this case, the grid connection should be at the branch or the total grid-connected switch. In this general case, the main switch is installed, and then the branch switch has a voltage-lost trip. In general, the use of switches is also selective. There are two options for switching. One is a plastic shell switch with an electric operation mechanism. The anti-islanding device controls the integration of the grid connection switch by controlling the electric operation mechanism on the switch. There is also an automatic reclosing switch, which can also be used with anti-islanding protection. All of the above are relatively small-capacity photovoltaic power plants. The switch used is a molded case. When the capacity is too large, frame-type circuit breakers are generally used. Question two: Do ​​not use UPS          For conventional microcomputer protection, it is installed in the switch cabinet or in the form of a screen cabinet installed in the relay room. The power supply is a DC screen. In this way, when the utility power fails, the microcomputer protection device can operate stably and can complete the protection function of the device for a relatively long period of time. There is no DC screen for distributed photovoltaics, so some projects require the installation of UPS as a power supply. However, the addition of a UPS is undoubtedly an increase in cost, so most of the time the switch is required to have a loss of voltage, which means that when the voltage monitored by the switch side is momentarily depressurized, the switch itself will trip. In other non-de-energized cases, a fault occurs by the device to achieve a trip of the switch. Question 3: How can the switch fail to reclose?          Nowadays, photovoltaics are widely distributed and it is relatively troublesome to operate and maintain them. If it is simply switched on and off due to a trip, it would not be able to follow manually. More importantly, it affects the amount of electricity generated. Therefore, for some transient faults, the switch should close. If the fault recovers, the switch should close automatically. This will neither affect the grid nor affect users. But if it is a permanent failure, it is another matter, such as current protection. When the switch cannot automatically reclose several considerations:         1, fixed value. Whether it is an automatic reclosing switch or a switch with an electrically operated mechanism, the closing must be constant. It is allowed to close at a fixed value.         2, wiring. Correct wiring, and no false connection.         3. Check whether the closing and tripping points of the switch can work normally.         4. For some grid-connected switches, if the recloser fails to reclose at the same time, the anti-islanding protection device must check the value to see if the number of closings can be set.  

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OEM Cooperation

    The company provides OEM services.This mode of cooperation is mainly suitable for the partners who want to do their own brand,we can redesign the brand for the partner, including your company's model, brand, screen printing, LOGO, product interface display, etc.which Can effectively help you enhance the company's brand image,At the same time, we will provide you with technical support, and strictly abide by the confidentiality agreement,as to after sales is the same right to ours we are the best partner for OEM user!

OEM Cooperation process:     

1、Determine OEM cooperation matters.OEM users need to prepare all relevant  documents according to the requirements in,including  the company seal cross by my company to review and confirmation and then discuss cooperation matters.         

2、Signed OEM cooperation contract.the contract shall be sign according to the arranged before.the contract will be signed once a year and in duplicate、Party A and Party B hold one copy.     

3、Production and management：After the signing of the contract,Our company will produce product according to the specified quantity of the following business, If there are other special requirements in the production process, the two sides need to consult with each other to resolve! 

OEM service     

1、After the signing of the contract,we can revise the Product specifications, drawings, product catalogue freely          

2、The company provides free technical training services.     

3,We provide free technical support for OEM users with the same after-sales rights.,If necessary, we can provide door - to - door service, 

Cooperation provisions：     

1、All users shall not be less than 500 years the number of OEM ,The purchase amount of protection relays for power systems and related comprehensive automation system shall not be less than 300 thousand RMB.    

 2、Both sides must adhere to the principles of friendship, mutual benefit ,All projects must be carried out under the premise of not violating the relevant laws and Party A and Party B shall not be out of law in any form, any excuse or illegal operation.          

3、We have the right to terminate the cooperation with the partners that did not meet the above requirements.                                                                                      Welcome all walks of life to meet the requirements of the user calls to negotiate: 13655813785 Blame sincere not faze . 

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The distribution project that company signed a contract in west Africa guinea salomon kalou's hotel

      The distribution project that company signed a contract in west Africa guinea salomon kalou's hotel         Guinea also is called the republic of guinea，lies in the West Africa in the west bank，closes to the guinea Bissau, Senegal and Mali in the North,The east and the ivory coast, south border with sierra leone and Liberia,The west faces the Atlantic ocean.        Salomon kalou's hotel is a five-star hotel,there exist a high demand especially the distribution ，the enterprise standed out in more than ten enterprises in a bid and win this project by its solid technical strength and simple style of work,        the devices that win the bidding this time have the line protection relay,transformer protection relay,Capacitor protection relay，PT protection relay，DCS control system and so on dozens of pieces of equipment,And complete the whole project of debugging in July 2016 to .        the owner of the project fed back that the relate workers have high motivated, strong responsibility, rich experience and strong technology，we are reliable partner.thanks for the spport and trust of West Africa guinea salomon kalou's hotel enterprises，we will Keep up the good work, and strive to move forward, make both the service and product  better!  

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The company won the bid for several millions project of Mourinho Suonuoyi mining ltd

      Recently,we Successful bid the millions projects in Congo,this movement  marks a pioneering step in the field of power system relay protection,Also add a new vitality and hope for the company

      For this project of Congo relay protection,we will actively form an outstanding project team, carefully do a good job search in the preliminary investigation of the background and actively choose protection technology, to ensure that the project can effectively complete the protection of the base of the project.The project has the wide area of power facilities protection, complex protection of the power system , high technical requirements of the relay protection techniques.The protection technology used in the combination of a variety of single protection technology.One of the highlights of the negotiation process is the cooperation of the project bidding party Mourinho Suonuoyi mining Ltd.And a large number of our company's protection devices has been came into use such as line protection relay, capacitor protection relay, bus protection relay, PT parallel protection, reactor protection relay, PT parallel protection, DCS system and other products.Successful bid of the project, means that the group has made a breakthrough in the field of relay protection, lay a solid foundation for the further development of the field as well.

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Customers of Pakistan visit our company

  The Spring Festival has just passed, the company ushered distinguished guest from afar---Mr. Jon and his business partners in Pakistan.        Pakistan（Malay Language：Pakistan）is one of the countries in Southeast Asia,Independence in August 31, 1957.Pakistan is a federal system composed of thirteen states and three federal territories,Area of 329847 square kilometers,The capital city of Kuala lumpur,The political centre is located in the city of cloth.Pakistan is one of the founding members of the association of Southeast Asian nations in May 31, 1974, and China formally established diplomatic relations.BHD where the Jon work was founded in 2005,Main engage in electrical equipment and electrical automation components,whose business expand to Southeast Asia, including Philippines, Indonesia, Singapore, Thailand and Brunei and other regions.     The Ma manager and Amy enthusiastically received the party of Jon.The customer first asked to visit our factory,Under the leadership of the chief engineer Li Gong, they have visited our production workshop and testing workshop.In the high pressure experimentation area, Li Gong also introduced and made the related test for the products that customer's interested :Generator rotor grounding protection device、Generator differential protection device、Busbar differential protection、Low frequency and low voltage solution column device、Main transformer protection device、Line optical fiber differential protection device.Customers showed their  interested in our products, and also put forward some of their own requirements,such as add a protective cover on the outer box of the equipment to prevent the corrosion of sea water;The accuracy of the microprocessor protection can t be done more high and the  function of GPS synchronization；Dielectric loss voltage level can be extended and so on.Amy records the customer's questions one by one and will further communicate with customers,Strive to meet all customer’s requirements.Customer are satisfied with our service attitude,And shows that the hope to build a long-term relationship with us.      We sincerely treat every friend from afar whatever home and abroad.we pay high attention to the question and suggestion that put forward by all of you,and we must try our best to solve it. with excellent product quality, first-class customer service of the JiBaonanrui will win more customers whatever at home or abroad.

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why is the price of the Generator protection unit so expensive

        Generator protection relay usually used for high and low pressure turbine generator units, the protection and control of the steam turbine unit, compared to the ordinary microcomputer protection relay, has very big differences,whatever in technical, functions, or requirements, compared with the ordinary protection relay requirements are much more complex. Therefore, the overall price of generator microcomputer protection relay to much higher than ordinary microcomputer protection price, here we come to the market price of the detailed analysis about the why the price of the generator protection is so high

       1、 on the technical requirements, because the protection of the generator and a magnetic field generating units must work together, work environment is relatively bad. And ordinary microcomputer protection relay working environment are generally ground substation, operation environment is generally not of protection relay of energy will not cause too much impact, and starting from the whole,

generator protection relay

work, design, aging, sampling is always and ordinary microcomputer protective relay to a lot of difficult, so protection relay for generator than ordinary protection relay expensive is taken for granted.     2、Protection function: current and voltage is generally most used in ordinary microcomputer protective relay commonly, in the check and inspection are relatively simple, and generator protection and monitoring relay to distribution use loss of excitation protection, rotor grounding protection, stator sending and receiving protection, especially loss of excitation protection and

rotor grounding protection

, the protection principle and common protection are very different, the difficulty is much higher, this is destined to the generator microcomputer protection than ordinary protection requirements are much higher.        3、The measuring function: in the measurement, ordinary microcomputer protection relay generally only need measuring three-phase current, three-phase voltage, active and reactive power on the line and generator protection relay also need to measure the excitation current and excitation voltage, people may ask, both of which have what different, I answer, both are not a concept, specific circumstances, you can to the staff of our company to ask for instructions to understand!     Compared to the general, the generator microcomputer protection and ordinary microcomputer protection relay, regardless of function or on the measurement, or in the technology research and development, much more complex than the ordinary microcomputer

protective relay

, products in the choice of hardware cost should be much higher. Therefore, protection relay for generator microcomputer protection relay price than ordinary to high, is inevitable.

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The photovoltaic power will become the main battleground in the electric power industry during

        In recent years, along with the country played high attention to the electric power industry,the power generation system with high energy consumption headed by fire power has gradually withdrawn from the stage of history .Since 2010,the clean energy headed by garbage power and photovoltaic power has begun to enter the stage of history quickly.Under the national promotion and enticement of high profits sustainable development with clean energy, the photovoltaic power has got a fast development. With the rapid development of 13th Five-Year plan, The photovoltaic power will become the main battleground in the electric power industry! Let us analyze the reasons in details:

        1. The national support.With the rapid development of global industry,some irrational development modes have a bad effect on earth's environment. As the biggest developing country,the environment is more serious relatively, which makes the nation pay more attention to it, while the electricity as the impulsion of economic development has become  more important. Compared with conventional thermal power, the greatest advantages of photovoltaic is environment,low energy consumption, sustainable and better repeated utilization, which one consistent with the National Sustainable Development Strategies.          2.High rate of return on investment. the 1W in photovoltaic power invests 10 yuan,1000W invests 1000 yuan.which makes you earn your capital about eight years ,but the life of photovoltaic power station is around twenty years ,and then you will get a return of 2.5 times. So more and more entrepreneurs have sawn the business opportunity and gushed into photovoltaic industry. Besides,the capital market's involvement provides a capital protection for development of photovoltaic industry,meanwhile which offers the necessary condition.          3.Chinese technology is enough to support the development of this field. Althoughthe photovoltaic needs high requirement in all respects, the major equipment conclude line protection,

transformer protection

and associated settings,in addition,it needs some software systems,such as power prediction system and integrated automatic system ,until now, china is leading in electric power automation technology ,and it is also enough to support the development of this field.          4.Bad macro environment and saturated traditional industry. Whether it is switch gear industry or

protection relay

t industry,some firms have found it is hard to do this project in the last two years,there are two main reasons for it, one is the bad macro environment, coupled with the increase of the efforts to fight corruption,a lot of electric power distribution project can not be taken,that 13th Five-Year plan,and also allows more entrepreneurs in the traditional power industry pay attation to this field, bring  power to the development of industry.

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Will the intelligent power station replace the conventional power station?

     The substation is important in the power system,It plays a very important role in the transmission of electrical energy.when relay protection has just started until 2000,the conventional power station is mainly power station in china. At present,the state grid mainly implement the intelligent power station.State Grid  determine the first batch of national pilot smart power plant project in August 2009,Intelligent power plants in the state grid power station is very common until today,But in the user station and some thermal power, and photo-voltaic power plant, the smart power plant is rare.many people forecast that intelligent power station will replace conventional power plant,I will talk about my own views on this issue.       The conventional power station is the most common power plant we have seen at the usual time,Microcomputer protection, switch cabinet, circuit breaker, transformer and so on are all conventional.The analog and switching capacity of the transmission are used in the second line cable.And the use of smart power plant equipment is also corresponding to the smart devices, the use of the provisions of the statute is also the international statute of 61850.         In contrast,intelligent of the intelligent power plant  is relatively high,From this view the superiority of intelligent power plant is still relatively high.But it is not realistic that build the power plant in a short time in China's power market.For the state grid power station, they must be responsible for the cuntry’s fund. then use intelligent equipment and high stability.But for ordinary stations, especially for those switching station factories of the power plant, the intelligent requirements is not very high.who requires the computer protection, the stability of a device and the safe operation.And in contrast to the cost of smart power plants than conventional power plants,it is much higher in the installation of the use of optical fiber, the use of the two line is very rare,it is also more difficult in maintenance and repair in power station,So it looks more trouble.       Not only that, intelligent power plant cost is relatively high, at present the factories who can do intelligent power station, with good and well reputation is not many in China.Even if there will be more manufacturers produce intelligent microcomputer but it also need a relatively long process. In view of this, conventional power station in the power system will continue to exist for a long period of time, it should be not easily replaced.

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analysis the future development trend of the relay protection

       Recently,National Bureau of Statistics announced the latest data,by November 2015,the purchasing manager index(PMI) of the manufacturing industry in China is 49.6%，fall after rise 0.2% than last month,but the PMI of the High-tech manufacturing and the Equipment manufacturing industry keep the growth all the time.though the good overall situation,the relay protection of small and medium enterprises still develope relatively difficult.         According to the personage inside course of study analysis,the main reason of the PMI of the manufacturing industry fall is following:firstly the influence of the low spirits market demand at home and abroad and the production low season,secondly,the recently persistent low turbulence of the plenty of commodity prices;thirdly,face with the pressure of the economic,the activities of the cooperate procurement have slowed,Replenishing inventory is shortage.          The data presented,though the PMI of the manufacturing industry fall after rise，With the adjustment of manufacturing structure in our country continue to advance,November the PMI of high-tech manufacturing  and the equipment manufacturing industry is respectively 53.1% and 51.6%,Continue to maintain growth while China's protection industry as a high-tech manufacturing industry is also maintained a rising ,the reason that the growth of the relay protection even though in the less optimistic environment of the manufacturing industry development cannot be success without business strategy，In the first three quarters of 2015 and the favorable conditions of policy of the relay protection,constantly adjust the direction of development and  open up a broader market,among with them the China World Trade Center weiertai acquisition of assets, achieved business diversification.Welltech hold jibaonanrui ITC 55% of the shares, also make full use of jibaonanrui trade overseas channel, open up overseas markets, forming double relay manufacturing and international trade owners, have made to the development of relaying protection.         《Research Report on the development and investment potential of China's components industry in 2015-2020》had showed，when When the manufacturing industry is on the rising,The contribution of enterprises is the highest but also some disobey the principle.PMI of the medium and small enterprises is respectively 48.3% and 44.8%,Respectively, down 0.4 and 1.8 percentage points.The development of enterprises is in the contraction range, especially in the manufacturing industry, the difficulties and problems in the production and operation are still outstanding.For example, the relay protection industry enterprises show where the problem lies. some microcomputer integrated protection enterprise has very far sighted in the market layout,But in the acquisition of the interests of the changes, led to the development of Nanjing Yu can Instrument Co., Ltd. in the development of the difficulties, there have been workers to ask for wages.          The difficult in the development of the Protection of small and medium enterprises has always been a common market,This is the topic of a commonplace talk of an old scholar.But why has it been in such a situation? the reason is more and more complex, one of the main reasons is the funding problem, medium-sized and small enterprises  have no the abundant capital as the large-lot producer, they have difficult in the financing,which made the development of enterprises said of an aged person.And the times are changing, small and medium enterprises in the previous project has not been fully realized, the market has emerged a new way of development.and then,Small and medium-sized enterprises in a common state,there is no competition for large enterprises,the protection of small and medium-sized enterprises has been stagnant.Even if the policy is introduced,mostly around the transformation and development of small and medium enterprises,however，The historical problems left over by the small and medium enterprises in the line protection have not been thoroughly resolved.under the condition of the market development ,capital and self conditions,Protection of small and medium enterprises in the transformation and development is difficult,But small and medium enterprises must meet the protection of the relay, the siege, only the development can reach the top.         The great development of the industry is not just a part of the factors that contributed to  all together formed. In the development of small and medium enterprises struggling, large enterprises need to their leaders, pull them out, walking in the way, effort for the development of the industry .

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The importance of relay protection in electric power system

    The microcomputer protection device exists in the power system by the way of  two equipments,Generally installed in the switch cabinet and the screen cabinet. there are equipped with different types of microcomputer protection devices for different voltage levels, different power plant models,whose use has insteaded  of the traditional relay protection,When the line or power failure, you can accurately determine the analysis, and timely response, tripping or alarm, to avoid  unnecessary losses by the failure.

Basic principles of

relay protection

  Normal circumstances, the related electrical quantity of the protected object is connected with the microcomputer protection,the protection will take the measures to deal with by the judgment of the change of the electric quantity before and after the changes. Usually there will be a significant change in the current and voltage when the fault occur,as following:1、Current increases.For lines or electrical equipment,under the circumstance of two-stage or three stage occurs short circuit,The current value is transient and will be much larger than the current value under the normal load.2、when the short circuit occurs in inter phase or grounding ,The voltage value of each point of the system will be decreased,especially when it is closer to the short circuit point, the lower the value of the voltage.3、The phase angle between the voltage and the current is changed.4、Frequency change  Several features of microcomputer protection      Safety, reliability, sensitivity, selectivity, quick action.these features are vital to the microcomputer protection device.but at present market,the development of the microcomputer protection is far mature,the users tend to be interested in the cost-effective.more closely to said that they consider the investment and operation and maintenance costs of the microcomputer based protection.       The microcomputer protection device is a very important electrical equipment,which ensure  the safe and stable operation of power system.For the electric power system, it is common to have a power accident,maybe the equipment is damaged.more serious,it endangered the lives and property of the masses of the people.For the development of the booming China ,the stability of electricity virtually guaranteed the steady development of China's economy.The function of microcomputer protection device is to ensure the normal operation of power equipment,When the fault occurs ,deal it in time, the power related personnel find the fault in time, and then deal with the fault.that will decrease the degree of the  fault in the shortest processing time,and power supply recovery in the shortest time.therefore,the process of the Production and the operation should be pay attention to.strict control from the choose of the Components and parts and the factory,Every link can not be careless.ensuring the quality of every machine is the duty of every protector.       In the debugging process,operate carefully by the manual and other related data,no mistake,no blind operation,it is prohibit for some people who can not do the Electrical commissioning and do not ask for the related people,Problem solving in time，so the ability can improve.safe is first and then obey the rules.

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Application of relay protection in life

    With the continuous opening of the electricity market,The competition in relay protection industry , like sailing against the current,move forward , or you 'll fall behind.JiBaonanrui  Constantly improve their own management, production, R & D, service to build a domestic first-class service team, provide you with a better quality of microcomputer protection products,especially the more abundant produce line,we will provide you with the 110KV and the below voltage level of the power automation solutions.        Since the development of relay protection device,great changes have taken place in the power industry about half a century!the Product features are no longer single limited,But more and more functional,universal.In the past you must communicated with the manufacturer when choose a product that has the function you need,Then the manufacturer produce it.And now you choose the product you needed ,the manufacturer will provide you with the necessary products.      Today the industry changes over ,the relay protection is widely used and also in constant change,appeared in all our life.It changes from simple to intelligent and single to a comprehensive, big to small，Widely used in our production and life.when it's getting dark,The lights of the street lamps lit up quietly;The temperature in the room turns high, the air conditioning automatic cooling it;Press a button in the hands,the bus automaticly  locked and unlocked；Press the button on the elevator to know which floor.....all these are the relay protection makes a difference.all the time,it is changing our lives.

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Main transformer protection panel

The Main transformer protection panel is that installed the main transformer protection and control device in a 2260*800*600 cabinet inside,Mainly composed by 9692 or 9693 (main transformer differential protection device), 9681 (main transformer high backup protection device), 9682 ( main transformer backup protection device), 9683 (main transformer low backup protection device), 9685 (main transformer of non electricity protection device) and some of the other switch components, it is mainly used in 110kV, 66kV, 35kV and below voltage main transformer protection and control.

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generator protection panel

the 9000 generator protection panel mainly formed by the 9698（Generator differential protection relay）、the 9688（Generator backup protection relay）、the 9689（Generator grounding protection relay）And some switching elements,Cabinet,The protection of the generator protection screen set protection, measurement, communication in one, come true the function of unattended.The product is mainly suitable for medium and small hydropower stations and thermal power station projects,It is mainly used for the control and protection of water turbine generator and turbine generator set.

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926MD low voltage motor protection relay

The 926MD Low voltage motor protection relay is a series of protective devices developed for the fault when the low voltage motor is used, set the protection device with protection, measurement, control and communication in one.the protection device collects three-phase current, three-phase voltage, and calculate F, P, Q, COS, Se, Eq and other data,When the protection meet the action condition ,the output of the driving relay is driven to achieve the purpose of protecting the low voltage motor.

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