What Is Fiber Optical Power Meter?

What Is Fiber Optical Power Meter?

2021-10-22
NOYAFA
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The fiber optical power meter is the excellent profit maker of SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED. Its performance is guaranteed by both ourselves and the third party authorities. Every step during the production is controlled and monitored. This is supported by our skilled workers and technicians. Having been certified, it is sold to many countries and regions where it is recognized for wide and specific applications. When customers search the product online, they would find NOYAFA frequently mentioned. We establish the brand identity for our trending products, all-around one-stop service, and attention to details. The products we produce are based on customer feedback, acute market trend analysis and compliance with the latest standards. They greatly upgrade customer experience and attract exposure online. The brand awareness is continuously improved.At Best Cable Tester Supplier in China _ Noyafa, we realize the importance of customer service. All products including fiber optical power meter can be customized to cater to the needs of the various customers. And, samples can be made and delivered to customers all over the world.
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How to Use Network Cable Tester_ Application Method of Network Cable Tester
How to Use Network Cable Tester_ Application Method of Network Cable Tester
Now cables are used in all aspects of people's production and life, so mastering the operation method of network cable tester is the most basic requirement for cable users. So how to use network cable tester?Application method of computer network cable tester1. Insert the two ends of the network cable above the main and auxiliary survey lines respectively, and you can insert any head at will;2. Then turn on the switch of the line measuring instrument;3. Observe whether the indicator lights of 1-8 on the main and auxiliary line measuring instruments are on, and the order of lights is correct.4. For example, 1 light on the main survey line instrument should be on, and 1 light on the auxiliary survey line instrument should also be on. If the 1 light on the main line measuring instrument is on and the 2 light on the auxiliary line measuring instrument is on, it indicates that there is a problem with the network cable and it can not be used normally;5. Among the eight lights, as long as the lights 1, 2, 3 and 6 are on, the network cable can be used, because the data is transmitted through these four lines, and the other four lines are not used to transmit data.There are two standards for the order of network cables:1: The standard of t568-b is orange white, orange, green white, blue, blue white, green, brown white and brown.2: The standard of t568-a is green white, green, orange white, blue, blue white, orange, brown white and brown.The first standard is generally used.Second, insert the crystal heads at both ends of the network cable into the RJ45 port of the main tester and the remote test end respectively, and turn the switch to "on" (s is slow gear). At this time, the indicator heads of the main tester and the remote test end should flash one by one.Test of direct connection: when testing the direct connection, the indicator lights of the main tester should flash one by one from 1 to 8, and the indicator lights of the remote test end should also flash one by one from 1 to 8. If this is the case, it means that the connectivity of the through line is OK, otherwise it has to be redone.Test of interleaved lines: when testing interleaved lines, the indicator lights of the main tester should also flash one by one from 1 to 8, while the indicator lights at the remote test end should flash one by one in the order of 3, 6, 1, 4, 5, 2, 7 and 8. If so, the connectivity of interleaved lines is OK, otherwise it will have to be redone.If the line sequence at both ends of the network cable is incorrect, the indicator lights of the main tester still flash one by one from 1 to 8, but the indicator lights of the remote test end will flash one by one according to the order of the line numbers connected with the main test end. In other words, the remote test end cannot flash in the order of the above steps.Phenomenon of wire open circuit testWhen one to six wires are open circuit, the indicator lights of the corresponding wire number of the main tester and the remote test end are not on, and other lights can still flash one by one.When 7 or 8 wires are open circuit, the indicator lights at the main tester and remote test end are not on.Phenomenon of wire short circuit testWhen two wires are short circuited, the indicator lights of the main tester will still flash one by one in the order from 1 to 8, while the indicator lights corresponding to the two short circuits at the remote test end will be lit at the same time, and other indicator lights will still flash one by one in the normal order.When three or more wires are short circuited, the indicator lights of the main tester still flash one by one from 1 to 8, while the indicator lights corresponding to all short circuits at the remote test end are not on.
Why You Want a Cable Length Testers
Why You Want a Cable Length Testers
Today there are many different manufacturers and types of network cable testers on the market. Standard testers are used by those who want to check the quality of their cables. Bridge cables are a one-piece technology and are often used by certification testers as they can perform a greater variety of tests and there are short training videos on how to use them.Professional network testers are used in commercial environments and by certified professional cable installers at work. Professional testers have more skills when it comes to troubleshooting cables while maintaining a high level of accuracy. As an added bonus, professional testers allow you to track and archive your test results for future references.Some verification tools contain additional features such as a Time Domain Reflectometer (TDR) to determine the length of the cable and the distance between interruptions and short circuits. Some test tools do not provide information about bandwidth or suitability for high-speed data communication.There are many different types of network testers on the market today. LinkIQ cable network testers are easy to use, as explains Eric Webb, Fluke Network Product Manager in the video below. It shows how the settings can be used to perform a cable test with a network cable tester, save the results and upload them to link ware where they are available.To help you find the best network or cable tester for your use, I have compiled a list of test products that work well. The most obvious difference between a generic or standard tester and a professional tester is the brand cost, where professional network testers are more expensive than other testers.I came across the Elegiant Network Cable Tester while working on establishing a LAN connection for a local company. With my extensive experience as an electrician, I can say that this is the best tool for testing cable connections.Selecting, selecting and purchasing a suitable network cable tester can be a complicated and challenging task. However, there are some essential factors that consumers should consider when purchasing a good network cable tester and absolutely should consider, as they can make or break the tester you are buying.For example, suppose you are looking for a good Ethernet cable tester or Ethernet cable speed tester. Network cable testers are sensitive products that are exposed to various extreme elements, suggesting that you should get a tester with a long warranty. In this case, you should look at the reviews of the Ethernet cable testers from previous buyers, who can confirm the star rating of the products.These three basic tests are performed in accordance with the EIA standards for twisted pair cables, wire mapping and cable length for high-speed performance. Check that the signal is strong and fast enough to meet network performance requirements. If you are testing the cable length with a calibrated capacitive tester it is better to test with a time domain reflector tester, as it can measure the distance to the location where the error is displayed.Make sure that the two ends of the cable you want to test are not connected to a TV, cable distributor, or any other related device. Find the right cable and touch the cable to one or the other so that a beep is generated. Connect one end of the coaxial cable tester to the wall plate on your coaxial cable wall and point the other end to the tester so that the entire cable can be assembled.This situation is indistinguishable from a real insulation break when the triggering current is exceeded. As the length of the cable increases, its capacity is limited by the rise time. The shorter the rise time, the higher the voltage, and the larger the DV / DT, the greater the amount of current required to charge the cable (parasitic capacity). Increasing the wire resistance of a longer cable helps to slow the charging current but requires a minimum dwell time of 10 s to ensure that the full cable length is reached before the test voltage is performed (leak measurements).Dirty contacts, bad bruising, cable damage and poor quality can provide strange and wonderful reading results. In order to reach the test voltage without damaging the traction current, it should be taken care to adjust the voltage ramp to the length of the cable so that it slows down. Cami Research ramp tester has a ramp which can be adjusted from 150 V / s to 5,000 V / s.The flagship cable tester VDV-II Pro uses a TDR to measure cable length and provide distance and error information. A TDR works by injecting a signal into the cable and measuring the time the signal reflects an impedance change caused by a short circuit.Standard testers are manual, while professional testers work automatically. Automatic testers allow you to apply contrasting IA- and ISO-testing methods and highlight many individual tests to verify conformity.The PocketHornet comes standard with a limited warranty of 1-2 years, depending on the region. Customers in the EU receive a 2-year warranty, while others only receive a 1-year warranty. It is not a cable certification device, but conducts cable qualification and verification.There are various types of cables on the market, but the most popular and widely used cable for modern technology is the coaxial cable. This article describes how to test a coaxial cable signal with a multimeter in situations where the transmitter does not work well. We may receive a small commission if you purchase a product through our selected links but the price of the product remains the same.In a house with a wired network connected to the TV, the cable coming from the family room should connect to a cable modem or router upstairs. There are 2 cables in the family rooms, the one marked "upstairs" is connected to the office upstairs and the other "downstairs" to the basement.
Some Tips for Using Cable Fault Locator
Some Tips for Using Cable Fault Locator
Some tips of cable fault locator: the occurrence of cable fault is accompanied by the laying and use of cable. The positioning of cable fault is gradually increasing with the different laying methods of cable. Among them, the positioning and search of bridge, tunnel and open laying in ditch is relatively simple, and the positioning and search of direct burial is difficult. When the fault nature is simple, the cable fault locator adopts special cable fault location equipment, which can locate the fault within dozens of minutes. When the fault is special, it often takes 4-5 days or even longer to locate the fault. When using echo method for cable fault location, sometimes by transferring the fault phase and wiring mode, complex faults are often transformed into simple faults, and the fault location is quickly determined to win time for the emergency repair of on-site lines, which is of great significance to the power supply user department. Low voltage power cables are generally multi-core cables. After laying and continuous use, they generally show two core and multi-core phase to phase or phase to ground short circuit faults. Sometimes, when it is detected that the fault waveform collected by a core is not ideal, it can be considered to convert the wiring to other fault cores for fault waveform detection, which often has unexpected effects. The collected and detected waveforms will become more typical and regular, so the specific location of cable fault point can be determined quickly. During the long-term on-site measurement of cable customers, it is found that the fault of small cross-section copper core directly buried power cable (35mm2 and below) and aluminum core cable may be accompanied by short-circuit and wire breaking fault at the same time. During on-site detection, changing the short-circuit fault to wire breaking fault measurement according to the different fault nature of each fault core will often double everything with half the effort. For the medium voltage direct buried power cable with extruded armor as the inner lining, the fault is mostly caused by external mechanical damage. When the insulating core fails, the inner lining may have been damaged. In case of special cable insulation fault, it is difficult to collect waveform with professional cable fault instrument. It can be considered to use the acoustic method to apply the high-voltage pulse directly between the steel strip and copper shielding layer of the cable, which will often be fixed quickly. In the field measurement process, we also found that when using the acoustic measurement method to locate the fault point of low-voltage cable, when the high-voltage line and ground wire are connected between the bad phase and the metal shield or armor, the sound is very small, so the probe can not be used to listen to the fixed point, and the effect is not ideal. Through the actual listening side on site for many times, it is found that if the distance between the discharge ball gap is appropriately increased, and the high voltage and grounding wire are connected between the two phases of the fault, the discharge sound will become larger and the fault point will be determined quickly.
Tips to Clean Stainless Fiber Optical Tester
Tips to Clean Stainless Fiber Optical Tester
Dry plug cleaners (also known as click cartridges) can be cleaned by slight contamination. However, connectors can be charged during drying, and this method can attract additional impurities.Laboratory tests have shown the attraction of metal powders to optical connectors that are electrically charged after being wiped with the dry tissue of a typical fiberglass cleaner cassette style (Berdinskikh, Fisenko, Daniel, Bragg & Phillips, 2003 ). Dry wiping creates a static charge which can attract contaminants onto the plug after cleaning (IEC TR 62627-01, 2010, p. Similar contamination can also occur in the practice of front surfaces on non-cleaned surfaces that are cleaned during the dry cleaning process.The static charge of dry cleaning can be reduced by exposing cleaned connectors and the end face during the cleaning process to deionized air for 5-10 seconds. Dry cleaning, however, hardens the contamination and requires additional pressure from the operator, which can lead to surface scratches that can cause permanent damage to the end face.The only way you can guarantee that your connectors will do their job is to thoroughly inspect and clean them. Once the fiber optic connectors are cleaned, it is best to reconnect them and cover them with a cap to ensure that they are not dirty.Owners of fiber networks should explore their options for cleaning fiber connections and choose the method that best suits their business. It is essential to inspect and, if necessary, clean the fiber optic connections before mating.Choose from cleaners for many types of appliances such as SC, ST, FC, LC, and Mu (clinking cloths) designed for multiple applications. This one-put-cleaner is designed to clean male connectors, female bulkheads, adapters, fiber optic patches, cables and testing equipment. It also cleans the end faces of the ferrule to remove dust, oil and other impurities from scratches on the end faces.The F offers several types of slide-in cleaners including a push-in cleaner for LC and Mu (1.25 mm ferrule), a push-in cleaner for SC, ST, FC and LSH (2.5 mm ferrule) and a push-in cleaner for MTP and MPO connectors.The easiest way to clean your test port is to use Quick Clean (tm) Cleaner. A handheld connector removes dirt, dust, oil, grease and dirt from the front of the connector.The CKF Fiber Optic Cleaning Kit includes our TravelSafe Fiber Connector Cleaner (FCS3), Plug Cleaning Pen (MCC25), Lint-Free Wipe (LFW90) and Hand Connector Cleaner (FCC 7020) and Replacement Roll (FCC 7021). Many products use the procedures shown in the Fiber Cleaning Techniques tab. The following hints are helpful to pay attention when cleaning connectors.IPA alcohol can be used to clean fiber optic connectors, but is not the best solution to clean them. An optical cleaning fluid to clean the fiber optic connection is the better choice. It will help to clean the connectors without the risk of damage.Calculating a force of 2.2lbs per 200mm will bring you to 45,000 psi, so contaminated migration in dusty environments should not be a problem. You do not have to worry about dust residues contaminating migration, as there is no physical contact with the plug and it is cleaned during the mating process. The best way to avoid the risk of contaminated migration is to clean the uncovered plug and cable assembly with a wipe and then glue the cleaner to the plug that is in the adapter.Several fibers are installed in its own sheath to separate from the buffer tube, and these fibers are surrounded by a common sheath. Scattering light causes a change in the refractive index of the fiber used, and the Bragg grid distributes the Bragg reflector. Coherent fibers are bundles of fibres arranged in the same way at the end of the transmitted images and are used to protect the fiber optic cable from physical damage by mechanical insulation. See macro bends for a small radius around the fiber optic cable so that it can be bent without excessive attenuation or breakage. This type of fiber optic connector consists of two tapered, ferrule-shaped receptacles that work in both directions.Please contact me if you need additional photos or information about this high-end upgrade. Silver Bird Bangle Bracelet sterling silver square hammer bangle with cute market of things that do not fit into your handbag, spare shoes or your tablet. Archive quality dry ink, inch cut surface, stainless steel cheese tool with rubber wood handle including fork tip, cheese knife, VFL visual troubleshooting, 20MW fiber optic cable tester, 650nm CatV, custom longboard, croozerboard, etc.Contamination of the fibre-optic end surfaces remains the main cause of problems with the fibre-optic network. Look at your face and follow the golden rule of inspecting, cleaning and re-inspecting. After cleaning, do not forget to inspect the front face. It only takes one second for a network to have Fi-7000 FiberInspector Pro certified front face according to IEC 61300 3: 35 standard.A digital microscope is a normal hand-held microscope to which a camera is added. The usual magnification range is 100x to 800x, but the most popular magnifications are 400x and 200x for this task. The latter is a better choice because you can see more of the area being inspected.
Best Wire Tester
Best Wire Tester
The introduction of wire testerWire testers are nothing but a tool used to test the strength and security of a wire. Wire testers are designed in such a way that they break in just one or two attempts.Wire testers can be found in any hardware store and are not difficult to use. They can also be purchased online for less than $10. They are very handy during construction or renovation work where there is a chance of breaking something fragile like wiring, pipes, or gas lines that need to be tested before use.It’s important for homeowners to know how much voltage their wiring is capable of handling when it comes to fire safety and home security..Tips for wire testerWire tester is an important job that most people don't know much about. The primary goal of the wire tester is to provide a safe and secure connection for the computer network. They have to find out whether the connections are working properly by checking the cables, connectors, and more importantly – with a voltmeter.Working as a wire tester can be difficult because they need to perform many tedious and detailed tasks such as: testing cables, connecting cables together, etc. However, it's definitely a rewarding career because when one successfully tests their connections they get paid!If you're interested in testing your abilities as a wire tester, create your own online profile on icanworkwiretetherules.com or check out career opportunities on Indeed.comHow to use wire tester?A wire tester is a device used to test a wire's resistance by applying a voltage to it and measuring the current.A wire tester can be used for checking whether an electrical wire or cable is faulty or not.The most common usage of a wire tester is in testing and repairing wiring circuits.The specifications of wire testerWire testers are used to test the integrity of cables. They are also known as cable testers or wire testers.Wire testers are instruments that measure electrical resistance and reactivity in a type of wire used for electric circuits. The instrument is normally a hand-held piece of metal with insulated blades called probes, capable of measuring electrical resistance in conductors and insulators.The main purpose of wire tester is to find out if the cable has any faults or not.The product instructions of wire testerWire tester is a product that helps in the process of connecting wires and cables. It comes with a power button and LED light.The product instructions are very helpful in understanding the function and use of the wire tester. It also offers safety precautions that need to be taken while using the device.An introduction to this section topic should include:- Section topic: What is Wire Tester?- Introduction: Wire Tester is a product that helps in the process of connecting wires and cables. It comes with a power button and LED light.The application of wire testerWire testers are used to measure the quality of a wire by testing its insulation and electrical resistance. They can be applied in industries such as electrical, automotive, computer, and serviceIn this day and age, wire testers are being replaced by automated testing machines calledwire tester. This is because they are much faster and easier to use than manual wire testers. In the future, with more automation in the work place, there will be less need for humans to do tasks that robots can handle instead.Automation will make tasks easier for humans to do their work efficiently as well as eliminating repetitive processes that human workers find tiring.
Cable Tracker for TV and Internet Providers
Cable Tracker for TV and Internet Providers
The introduction of cable trackerCable tracker is a device that allows a cable to be cut off from the power source. It is mostly used in cases when the power line has been cut or disconnected.This technology has been around since 2005 but it was not until recently that it gained popularity due to reduced cost and its ease of use. Cable tracker is now widely used for various purposes such as electrical work, building maintenance, and even home security.Cable tracker allows you to stop power by disconnecting the line from the main circuit breaker without having to turn off all of your appliances which may incur an expensive bill if turned off incorrectly.Tips for cable trackerCable tracking tools are designed to help people find the best cable companies in their area. These tools provide a list of options that can be narrowed down with ease.If you've been living without cable for a long time and are ready to make the switch, one of these tools can help you find the best deals and package services that will suit your needs.Making the switch to cable is a big decision, and it's important to know what you're getting yourself into before committing.How to use cable tracker?Cable tracker is a small device that we use to measure the distance between two points and it is found in almost every room in our home.Today, there are a lot of new ways for us to enjoy watching TV in the comfort of our own homes. The cable tracker helps us find the best angle for watching TV and even lets us pause while we cook dinner.Cable tracking devices can help you with many tasks around your house like finding the right position for an antenna or measuring distance between two points. They are inexpensive and easy to use.The specifications of cable trackerCable tracker is a device used to measure the distance between a point and a cable laying on the ground. It consists of a rod, an "O" ring, and an attached meter.The cable tracker was developed by Alfred J. Butler in 1883 and patented in 1885. It was originally meant for measuring the distance between two points on a long piece of wire. However, it became popular after being adapted for use with cables.A favorite use for this device is to measure the height of trees by running it through each tree's trunk, taking care not to come in contact with the metal rods inside which could damage them or cause rusting that would eventually lead to breaking off branches.The product instructions of cable trackerThe product instructions of cable tracker is a website that helps customers to choose the perfect cable and subscription for their needs. In order to better assist customers, the company has decided to put in AI writing assistants.It is important for companies who are working with AI writing assistants to make sure that they are not taking away from human employees and instead enhancing their work. They can do this by collaborating with other departments.The main purpose of product instructions of cable tracker is to help people find the right cable subscription for them, which will help them save time and avoid potential mistakes.The application of cable trackerCable tracker is a technology that helps in the installation of underground cables. It is mainly used for making the installation easier and faster.The device consists of a sensor, an on-board computer, and an automatic control software. Cable tracker can be used in different types of environments with varying conditions such as drilling through hard rock or through water or mud.Cable tracker is useful for many industries, and it has been most widely used in telecoms construction. The first application was done by Telstra's Cabling Systems division in 1995 at a construction site near the Sydney Harbour Bridge in Australia.
The Evolution of the Handheld Laser Measuring Device in China
The Evolution of the Handheld Laser Measuring Device in China
The Great Wall of China, the Taj Mahal, the Roman Colosseum and the pyramids are just some of the largest and small gauges in the world in critical buildings. The development and mastery of these tools has been crucial to the evolution of the human species. Laser pointers are also used in robotics, for example, laser guidance guides a robot into a target position using a laser beam. Green laser pointers are used for similar purposes in daylight and over long distances. Another common use of lasers in entertainment is the special effects used in laser shows. Clubs, parties and outdoor concerts often use high-power lasers as security for the spectacle. For example, construction companies use high-quality laser pointers to increase the accuracy of displaying certain distances when working on large-scale projects. In astronomy, laser pointers can be mounted on a telescope to align the telescope at certain star locations. Green laser pointers are also used by astronomers for star parties or lectures on astronomy. Laser rangefinders have built-in processing capabilities that allow them to triangulate, calculate and measure distances, as well as calculate area and volume. They are accurate enough to measure long distances and display fast measurement results, compared to traditional bands used for measurement applications. With the various functions that digital handheld meters offer, the demand for these devices via tape increases. A major factor in the growth of hand-held laser rangefinders is the growing construction sector. Noyafa is committed to scientific and technological applications of laser detection. The growing demand for digital measuring instruments for precise measurements and the resulting growing demand for hand lasers and distance meters in the construction industry is a key factor in the growth of the market for hand lasers and distance meters worldwide. Measuring tools continue to evolve with technological advances such as lasers. With the development of mass production of integrated circuits (IC), the measuring tapes have become digital. This is different from 100-foot measuring tapes, which are made of fabric and used to mark the exterior dimensions of large buildings.
Cable Tracker& Cable Analyzer Software
Cable Tracker& Cable Analyzer Software
One of the biggest features of smart TVs is the amazing picture quality. However, sometimes you might not have enough time to watch all your favorite TV channels or movies.Cable TV is a necessity for the majority of people in the world. The most popular cable company, Comcast, has become one of the most-trusted brands in the United States. For a couple years now, they have been expanding their presence in Europe where they have been able to break into new markets and capture valuable market share.My team and I created this smart TV cable tracker. It allows you to check the status of your cable box and the channel TV provider but it also shows you if there is any change in your bill for a given period.TV and cable tracker is a very popular task for copywriters. It requires not only creativity but also very precise attention to detail. You need to be aware of the titles, terms, subtitles and other details related to your product/service. In addition, you have to be able to describe the program in a way that is easy for the viewer.TV& cable trackers are the lifeblood of the industry and need to be maintained. They can, however, be a pain in the butt for those who don't have the required skills to maintain them and still keep up with their customers.With AI assistance these tasks can be handled by software that is able to monitor and keep track of traffic data as well as provide suggestions on what content from different sources might suit a client's needs best.As TV has become a main source of entertainment, we have to study and understand how it works. The TV channel that you are watching is usually embedded in the cable box and a lot of times this information is available on the Internet. There are many people who can help you with this task.How to use a smart TV is not always easy.The idea of this application is to help home viewers to find out which channel they are watching on their cable TV without having to switch between different channels.Using video to create a brand personality for a television station can be an effective way to open up the communication with the audience and attract them to watch.A TV channel is usually not in possession of super videos, but they have other options such as trailers, promos, commercials etc. The clips that should be used are created in a way that it inspires people and their attention is drawn towards the content. The challenges of creating these clips are very high; there are many types of details involved and when they go wrong, it will spoil the whole process.The video tracker is one such tool that aims at identifying all kinds of promotional content for a given amount of time by using various processes including trending search engines.The cable companies want to provide access to their content in a way that is convenient for the consumer. This can be done through smart TVs that have Internet connections and where the content provider has an agreement with themSection topic: Social Media Optimization with automation toolsIntroduction: Automation tools are used by marketers, journalists and bloggers in order to make it easy for them to find out information on social media. These tools allow them to make the desired determination, find out how many people are actually using these channels and then create content based on this information.With the growing trend of cable TV, more and more people are getting tuned into their favorite shows. This makes it difficult to find the right channel for them.To solve this problem, authors use a popular feature of smart TVs - internet TV. The tracking feature allows you to watch channels that are not available on your local provider remotely from anywhere in the world.In order to make cable TV more efficient, some companies are building specialized scripts for their distribution. Some of them are highly based on defined rules and protocols, while other ones may be custom developed by the experts.This section is intended to introduce these custom built scripts and how they work. The authors will also show you how they can be used as a tool to save time in daily tasks - from scheduling, scripting and scheduling repeated reminders, working with data feeds and extracting relevant data from them.
Problems Needing Attention in Field Repair of Wires and Cables
Problems Needing Attention in Field Repair of Wires and Cables
In the process of cable laying on site, the phenomenon of scratch and damage on the surface of cable sheath is common, and only the sheath is damaged slightly. How to repair can ensure the quality, short repair time and ensure the quality has increasingly become a common concern of cable consumers. Moreover, the investment is small and easy to realize under the bad conditions on site. Therefore, the repair technology and quality of on-site sheath have increasingly become the concern of users. The on-site construction conditions of cables are generally poor, which may be located in the power plant under preliminary construction, the newly-built field railway under preliminary construction, on the bridge or in the cable tunnel. Because the repair of field cable sheath is carried out with plastic welding gun, and the heating of plastic welding gun requires 220V AC, it is in the emerging field project, Generally, there is a lack of power supply on site, or there may be power supply. Due to the randomness of the laying position of on-site cables, it is difficult to provide power supply. Therefore, to repair the cable sheath, on the one hand, the personnel are in place, on the other hand, the power supply is mainly provided. Only the above two basic preparations can be made, In order to realize the normal development and progress of cable sheath repair. In order to facilitate the smooth repair of cable sheath field, the construction unit shall be equipped with field small generators. At the same time, it is convenient for on-site repair. The quality of the plastic welding gun provided now should be excellent. The heating area of the nozzle should be large and the heating speed should be fast. Moreover, the damaged parts in the cable setting out process are random. This work is easy to carry out in general cities and plain areas, but in some mountainous areas, due to the influence of complex terrain, the cable repair work is actually very difficult. Therefore, in order to reduce the investment in corresponding aspects and quickly solve the problem, a key problem is that the number of personnel in the cable laying process must be sufficient, and formal cable laying equipment shall be used for formal setting out, so as to avoid and reduce the damage of sheath in the cable setting out process. The technology required for on-site cable repair is not very high. After the cable is damaged, the cable laying construction unit must repair the cable on the premise of confirming that there is no damage inside the cable, otherwise the cable sheath repair has little practical significance. The cable must be repaired in time, otherwise the entry of external moisture and moisture will affect the service life of the cable. In Meiyu weather in the south, after the cable end is laid, the cable end is not sealed in time, resulting in the water flowing into the cable trench entering the cable end for 10-20 meters. After stripping the insulation of the end, it is found that all the conductors have been blackened, resulting in the waste of the cable after laying. Therefore, the inspection of the cable after laying should be strengthened, Maintenance and storage shall be carried out to prevent the shortening and termination of cable life caused by various external factors on site before power on. Some tools and materials used for on-site repair of cables must be fully prepared. Plastic welding gun is necessary. High voltage insulating tape, waterproof tape, peeled leather of plastic insulation and sheath, and other sealing materials must also be prepared, because cable insulation and sheath materials are mainly divided into cross-linked polyethylene, polyethylene, polyvinyl chloride and other materials. Some materials are thermosetting materials, such as cross-linked polyethylene insulation, which cannot be melted and reused again. They can only be repaired with high-voltage insulating tape and repair tape series provided by 3M company in the United States. Some materials belong to thermoplastic materials, which can be melted and used again at high temperature, such as polyethylene, polyvinyl chloride and other materials. Some materials can be taken on site, and the corner sheath material stripped from the cable end can be cut into thin strips to repair the insulation and sheath of low-voltage cables, The repair quality can fully meet the requirements of the normal service performance of the cable. In addition, the treatment of sheath damage of medium voltage cable during on-site laying should not be too rough. One is that the cable must be handled with care during the laying process. In addition, after the external damage of the cable, the damage of its internal insulation is sometimes hard to say, The author once conducted a return test on the cables with multiple damaged outer sheath caused by careless construction in the field laying process, and found that partial discharge exceeded the standard and breakdown occurred in the damaged parts of the cables. Therefore, for medium voltage power cables with damaged outer sheath in the field laying process, it is best to cut off the intermediate joint or replace the cable again, Because there may be hidden dangers after repairing the damaged part of the cable. Facts have proved that the repair of insulation and sheath of low-voltage cables must be slightly damaged. The repair of insulation and sheath can only be carried out on the premise that the insulation and sheath are damaged and other structures of cables are intact. The requirements of medium and high-voltage cables may be more stringent. In order to reduce the number of intermediate joints of cables in cable transmission of some projects now, All cables are long-length single core cables. Due to the long laying distance of the line, responsible terrain, the number of construction personnel and the lack of professional cable laying equipment, the probability of cable sheath damage during the construction process is greatly increased. After the above problems occur in some construction, it is irresponsible to wrap a bag of ordinary tape casually. There is no knowledge of the internal damage of the cable damage point. Insulation breakdown or potential quality hazards are likely to occur during the on-site completion test and later operation of the cable.
Principle and Application of Cable Oscillation Wave Test
Principle and Application of Cable Oscillation Wave Test
1、 Principle of cable oscillation wave test through cable oscillation wave test can not only diagnose the overall insulation of cable, but also test partial discharge and locate defects. The principle is LCR damping oscillation principle. On the basis of completing the cable pressurization, a damping oscillation voltage wave is formed through the built-in high-voltage reactor, high-voltage solid-state switch and the test cable. A sinusoidal voltage wave similar to the power frequency is applied to the test cable to excite the partial discharge signal at the potential defect of the cable. Based on the pulse current method, the partial discharge signal is detected with high sensitivity, and the detection, acquisition and upload of partial discharge signal are completed with high-speed data acquisition equipment. The single test process is about one minute, with high test efficiency and no damage to the tested cable. On the basis of obtaining the partial discharge data, the data analysis software automatically completes the cluster analysis and traveling wave positioning, which is convenient for users to comprehensively evaluate the cable state. 2、 Purpose: the cable oscillation wave test standard passes the field test to check the insulation condition and internal partial discharge condition of the cable without damaging the insulation of the cable itself, so as to evaluate the cable insulation. The high voltage unit of cable oscillation wave test can generate oscillation wave high voltage signal, and the high voltage generator can generate any high voltage of 0-30kv; For the partial discharge test device with no blind area from the partial discharge signal, there is no blind area, and it can detect the cable below 250m for partial discharge test; One laptop can be used for control; External safety control units such as operation software (Chinese / German / English version); Analysis software (Chinese / German / English version); A 7.5m high-voltage connecting line without partial discharge, with anti falling off safety design; The partial discharge under system voltage is less than 1pc III. cable oscillation wave test case analysis through the above understanding, let's talk about examples below, so that you can better understand its actual field use. Firstly, connect the test line according to the instructions, and then turn on the power supply. The waveform diagram during the test is as follows: through a waveform analysis, we found a damaged gap in the outer sheath at about 132M in the field survey, which is the cable insulation damage caused by external construction force. After disassembly, the main insulation is damaged
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