Cat5e Tester Buying Guide

Cat5e Tester Buying Guide

2021-10-21
NOYAFA
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One important reason for the success of cat5e tester is our attention to detail and design. Each product manufactured by SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED has been carefully examined before being shipped with the help of the quality control team. Thus, the qualification ratio of the product is greatly improved and the repair rate is dramatically decreased. The product conforms to the international quality standards.To successfully built a global brand image of NOYAFA, we are dedicated to immersing our customers in the brand experience in every interaction we engage with them. We continue to inject new ideas and innovations into our brands to meet the high expectations from the market.cat5e tester is supplied together with many professional services. In Best Cable Tester Supplier in China _ Noyafa, customers can customize design, size, color, and others as requested. We can also provide custom samples for reference.
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The Secret of Using Pipeline Detector
The Secret of Using Pipeline Detector
The pipeline detector basically has the following three detection methods: direct connection method, clamp method and induction method. However, the use frequency of pipeline detector can be basically divided into two categories: high frequency and low frequency. Low frequency attenuation is slow, transmission distance is long, radiation is small, it is not easy to connect in series, but penetration is poor; High frequency band high frequency band, strong penetration, large radiation, but fast attenuation and close distance. Therefore, the appropriate working frequency should be selected according to different methods. 1、 Direct connection method direct connection method is to load the signal sent by the transmitter directly onto the pipeline to be detected by the pipeline detector. Direct connection method is the best signal processing method, which is usually preferred when conditions permit. Direct connection mode is adopted, the signal is stable and not easy to be disturbed by other pipelines. In practice, cast iron pipelines and steel pipes are recommended to be tested by direct connection method, in which the use frequency can be selected according to the material of the pipeline, and the steel pipe can use low frequency, because the steel pipe has good conductivity, and the use of low frequency can be transmitted further. However, it should be noted that the signal of direct connection mode will be transmitted in two directions along the pipeline and distributed unevenly. The grounding point should be a certain distance (& gt; 5m) from the pipeline. The ground wire needle should be inserted in the soil and watered if necessary to reduce the ground wire resistance, which is conducive to signal transmission. 2、 Clamp method can be used when the signal cannot be directly loaded on the pipeline. The method is to connect the signal of the transmitter with the target pipeline through a clamp. The invention is applicable to communication, power and other pipelines. Generally, when this method is adopted, the use frequency can be selected according to the external interference. In the case of small external interference and extremely poor conductivity of the pipeline, high frequency can be used as induction. Generally speaking, we can detect with a frequency of about 33 kHz. Pay attention when using the pliers. The jaws of the pliers should be closed. In addition, although it is convenient to apply signals, the transmission distance and signal stability of this method are worse than those of the direct connection method. 3、 As the name suggests, induction method is to directly sense the signal of the transmitter to the target pipeline through non-contact mode. Generally speaking, this method can be used only when direct connection and clamp cannot be used. However, this method is greatly affected by the surrounding environment, and will produce a lot of interference when the vehicle passes through or the pipeline is close to the metal. Therefore, when selecting the frequency again, we must pay attention to avoid using high frequency for detection as far as possible, because the high frequency excitation range is large, which will cause serious interference between pipeline signals. In use, it should be noted that the distance between the transmitting end and the receiving end should be kept 10m as far as possible to avoid the frequency of the transmitting end interfering with the signal. In terms of methods, such a rule is generally followed. Direct connection can be used without pliers, and induction can be used without pliers. Frequency selection is also to select low-frequency detection as much as possible according to specific conditions. This ensures that more accurate conclusions can be drawn when using the pipeline detector.
How Does the Doctors Screwdriver Run a Calculation Whilst Destroyed?
How Does the Doctors Screwdriver Run a Calculation Whilst Destroyed?
In The Almost People, and The Eleventh Hour, the Doctor's screwdriver is destroyed and later regenerated. However, in The Day of the Doctor, the Doctor(s), run a calculation running over 400 years. How is this possible, if the screwdriver was destroyed between the start and finish? This is technically trivial. Anyone running a very long computation (and some real computations can last for weeks) will regularly save the state of the computation on some reliable medium that does not need power, so that the computation can be restarted after any kind of failure. Actually there can even be several levels of back-up, balancing reliability and cost.The computation does not need to be restarted with exactly the same software, as long as the intermediate results that have been saved can be interpreted and reused by the new software. Actually this can even be a way to improve the software (or the hardware) while the computation is on-going. This is standard technology, even for people who are not time-lords.The screwdriver could simply save its state on the Tardis whenever there are close enough to communicate by whatever means. It could also be saved in various places known to be stable in time by someone who travels through time.If the screwdriver is destroyed, only that part of the computation done since the last back-up is lost and must be redone.By the way, since the Doctor travels through time, he could well organize the computation and back-up to get a lot more than 400 years worth of computation, depending on the structure of the algorithm and the computational capacity of the screwdriver.It is to be expected that the computation does not take all the computational power of the screwdriver. If a computational thread actually leaves a lot of untapped computational power, it can be parallelized with a future fragment of the same thread by getting from the future the starting state for the later thread. Time travel extends the possibilities for parallelizing computations. OTHER ANSWER: Like Rose said in The Day of The Doctor" Same Software different case"Therefore the Doctor's screwdriver was not completely destroyed, only the case containing it was; the software was safe making it possible for the TARDIS to repair the case and give the Doctor a seemingly "new" screwdriver with the computation still intact
Cable Tracker to Find the Right TV Service
Cable Tracker to Find the Right TV Service
The introduction of cable trackerCable tracker is a device used by cable providers to check the status of their lines. It is a simple, non-invasive and quick way to detect faults in cables or cables that are not working at all. It helps technicians to effortlessly identify and repair issues quickly and efficiently.The introduction of cable tracker began when the National Cable Television Association (NCTA) first came up with this idea as it wanted to prevent service interruptions by providing an easier method for cable providers to spot faults in their lines. The NCTA was founded in 1972 as the United States’ first cable television industry trade organization for the American cable television industry.This article discusses how important it is for communications companies like Cable TV companies in order to avoid disruptions and access uninterrupted service.Tips for cable trackerCable trackers are a type of device used to identify the location of underground cables. This device is mostly used for utility and construction companies.This article is going to help you understand how the cable tracker works, how you can use it, and common mistakes to avoid.In this article, we will go over the following:1) How does a cable tracker work? 2) Common mistakes people make when using cable trackers 3) Tips for making your life easier with cable trackersHow to use cable tracker?Cable trackers are used to guide the cable wire through the wall. There are two types of cable trackers: straight and angled. Straight trackers can be used when drilling holes through a plasterboard wall, while angled ones can be used to guide cables through a brick or stone wall.I recommend that you use straight cable trackers if you need to drill holes in your walls, but if you want to use them for other purposes, then I recommend that you use angled ones. This is because they can be more difficult to install in brick or stone walls than straight ones.There are different types of cable tracker on the market and depending on their designs, some of them have more features than others. However, as long as they follow the same principle with their design, then they should workThe specifications of cable trackerCable tracker is a device that is used to align the cables in the house which are going through walls and floors.The cable tracker attaches to a wall, and then the cables go through its slots. The cable tracker can be placed on any surface and as soon as it touches the surface, it starts tracking over it.Most of these trackers have a slot for attaching a charger.These trackers also come with an app which you can use to control them remotely. The app makes it easy for you to see what your cable tracker is doing at all times.The product instructions of cable trackerCable tracker is a small device used for television cable and satellite TV. A cable tracker is a device that can tell you the right distance between your current location and the closest location to the desired channel.The product instructions of cable tracker say that it should be used on flat surfaces. This means that if you are using it on carpet, you should be extra careful when using it.It’s important to read the product instructions of cable tracker before using it so that you don’t get in trouble with your TV provider because of their terms and conditions.The application of cable trackerMany companies in the cable industry are using cable tracker machines to put together bundles. Cable tracking is a process of assembling, bundling and assigning individual price points to the various channels in a package.Cable tracker machines are used by cable operators and suppliers. They help bundle channels together for a specific customer contract. The operator can also use them to track the activity of their customers on their own side of the business to see what they want and what they don't want.
LC Duplex Fiber Connector for High-density Cabling
LC Duplex Fiber Connector for High-density Cabling
Due to its small size, LC connector is the mainstream fiber optic connectors and is widely used in optical communication networks, data networks, and cable television networks. In daily application environment, LC duplex connector used more often because of its cabling space saving. LC duplex fiber optic connector is two simplex LC connectors encased in a common housing. Compared with LC simplex connector, the installation steps are reduced, saving time and money.HYCs LC duplex connector is superior to traditional LC duplex connector, providing an innovative solution for quick unlocking. Compared to the traditional two single connectors, this duplex connector only needs one press to achieve double releasing. As shown in Figure 2,3, the design of this two-core connector has two advantages, one is the longer clip and another is a lower clip. The extended longer latch on top of the connector body makes it easier to disengage from the adapter, even in high-density packaging. If you have the experience of releasing LC duplex connectors in patch panels in high-density cabling, you may know why this is important. Because in the cabling case, thumbs and forefingers are not ideally suited to operate the release lever and pulling the connector. The handle portion of a conventional duplex connector will be slightly higher than the adapter, which will take up more space during the cabling installation. The lower clip design of this LC duplex connector can save more space. In the high-density environment of the data center, the space saved by multiple connectors is combined to have a great advantage.Another important advantage is the ability to reverse polarity. In the optical signal transmission, the optical signal is divided into a receiving end and a transmitting end. The optical fiber link transmitting signal (Tx) at one end of the optical cable must be matched with the corresponding receiver (Rx) at the other end, and the matching is called polarity.Conventional LC fiber jumpers have significant limitations in achieving polarity switching. It is necessary to pay special attention to the direction of polarity transformation to avoid the failure of termination and face the possibility of replacing the jumpers and re-cabling. The ability to switch the polarity of this LC duplex connector makes this operation easier, saving a lot of time and wiring costs by easily switching polarity without any tools.With the rapid application of 5G, how to provide a high-density, low-cost, easy-to-manage, and highly reliable network cabling system for data centers has become an increasingly important requirement. The LC duplex fiber optic connector is a high-reliability, low-cost, high-density cabling solution. Originally published at wordpress. com on April 27, 2019. RELATED QUESTION What is the pipe schedule, pipe class, and which kind of pipes are used? Pipe schedule always signifies the wall thickness of pipe /pipe fittings ,In simple words how thick the pipe is given by schedule , According to Asme standard For butt weld fittings B16.9 std gives you schedulePipe class refers to the material specifications of pipe ,it gives you the grade of pipeFor eg A403 Grwp gives austenite stainless steel pipe classA234 Grwp is for wrought carbon steel pipeDifferent types of pipes1.MetalsA.weldedB .Seamless2.Non metals3.HdpeWhat is the pipe schedule, pipe class, and which kind of pipes are used?.
Cable Tester Buyer's Guide
Cable Tester Buyer's Guide
After I had read about the AI-enabled cable tester, I visited an exhibition and saw a demonstration. It was very impressive. The analyst who demonstrated it showed me how the software could detect different aspects of a TV, including its size and weight. He showed me how the software would constantly update itself based on what it found and how well it was able to predict which device would be best for my needs as a consumer.In order to give you the best deals on the latest technology, we have created a simple tool called "Cable Tester". With this tool, you can find the best prices for TVs and Blu-ray Players.In this era of unprecedented competition for every consumer and a shrinking channel space, the TV market is becoming more and more competitive. As a result, there are not enough ways to choose from, while keeping costs down.The TV industry has long been dominated by a handful of companies. If you are a consumer, you may have to buy several TVs before you find one with the best features and price.Various tech companies are incorporating AI into their products. They want to sell machines that can do this for them, but they also want to make sure that the machine is not harmful and does not break any safety regulations.Computer vision is getting better at identifying objects in the room, even when there are people around. This allows us to recognize faces in photos and other features such as hair color or age that we would not notice otherwise. It can represent people and objects accurately so that users do not have to do much work in order for their needs be met. It can also recognize specific elements of what it sees like"Tv Tester" is a feature that was added to the Netflix app. The purpose of this feature is to make it easier for people to find the best deals on TV. To do so, it provides recommendations based on the user's preferences and content of interest.Cable tester is one of the most popular tools for discovering great deals on TV, Blu-ray players and other electronics. However, generally speaking, cable testers aren't very useful unless you already know what features each brand offers. That's why we decided to make it a whole lot easier to find the best TVs and Blu-ray players for you by providing an overview of 10 of the best cable testers in each category.Since most people buy a TV or a Blu-ray player, they have to think about the best price.With an AI writer, you can get rid of all those guess-work and come up with an idea in the right context. The AI will suggest you the right price and provide you with information on brands and models that might suit your needs.Because of the sheer number of TV offers on the market, it can be difficult for consumers to choose the best TV for them. Rather than spend too much time finding the best deal or scouring through endless reviews, a cable tester can give you just enough information to make an informed decision before you buy that new TV.A cable tester is someone who tests cables. It is an activity that needs to be performed very carefully and must not be done in haste.The main purpose of the cable tester is to check the quality of a cable, whether it has any defects or if there are any loose connectors. When a cable fails, this can lead to fire or other forms of damage. Hence, it is important that the test results are accurate and accurate testing equipment should be used. Also, it must be mentioned that some cables fail because they are damaged during transit and not in use.The cable tester is a device that is capable of detecting a number of different kinds of faults in cables. This article will discuss the most common types of faults and what the cable tester can do to help diagnose them.Cable testers come in three types: video, audio, and fibre optic. Each type has its own set of specific characteristics and can be used to detect faults in your cables (see our article on each type). Here's a brief overview:
Brief Introduction of Cable Identification Instrument
Brief Introduction of Cable Identification Instrument
The working principle of the cable identification instrument needs to add a special signal to the identified cable, which should be received by a special receiver. Using this characteristic, the cable to be found can be identified. The cable identification instrument works according to the following principles: the cable identification instrument consists of a signal generator, a receiving clamp signal detector and an indicator. The signal generator mainly generates special pulse modulation signals, which are added to the stopped tested cable through the output line. The receiving clamp is used to find the tested cable on site. When the receiving clamp detector detects the special signal applied to the cable, The electric meter pointer on the signal detector swings synchronously with the frequency of the applied signal, while the signals detected on other cable lines are much smaller and in the opposite direction. It is easy to determine the tested cable by indicating the amplitude and direction of the electric meter. When the receiving clamp signal detector is used in combination with the signal generator, it can be used to distinguish the charged state of the cable, or assist in finding the short circuit position of the cable. When receiving clamp signal detector is used, clamp the cable with clamp. Dear customers: Hello, our company is a high-quality development group with strong technical force, providing users with high-quality products, complete solutions and superior technical services. The enterprise adheres to the tenet of building a business in good faith, keeping the business with quality and developing the business with enterprising. It continues to climb new peaks with a firmer pace and make contributions to the national automation industry. New and old customers are welcome to buy their favorite products at ease. We will serve you wholeheartedly!
Best Cable Tester& Cable Tester Software
Best Cable Tester& Cable Tester Software
This article will help you find the best cable tester for your needs.A good cable tester is more than just a cable tester. It should be able to give a sufficient overview of the cable connections and be able to identify any problems with the connection.There are many different types of cable testers and they all do the same thing.In the cable industry, there is a need to test different cables, both for the purpose of quality assurance and in order to make sure that a certain product is compatible with different types of equipment.There are several software products available for testing cable, especially as they become more common in homes and businesses. Some of them have been designed specifically for testing cables. But the problem is that most of them require you to install it on your own computer or laptop first before you can use it. Some are hard to use and require too many settings so that you have to go through many options before finding an appropriate setting.This article will guide you through some tips on installing any cable tester properly so that you can quickly get your cable tested without having to do much research. It will also point out someWe have a cable tester, a type of cable plug that is used to ensure the quality of cables. The cable tester has four prongs and is connected to the main power supply by one wire. These wires are also connected in pairs: one goes to the positive terminal and another goes to the negative terminal. When you want to connect two wires together, you need to connect them first in pairs (with positive and negative terminals) and then separately in pairs (with positive and negative terminals) as shown below:In order for you to test whether or not two cables are connected properly, you will need a cable tester socket adapter. This device looks like an ordinary socket with only one wire on it. The connection between these two wires is made with an adapter. You can find theseIn order to make sure you get the best deals on TVs, Blu-ray players, etc., you need to do some research. You might have heard about a TV review site named "BestBuy" or a "Best Buy". You might also have found yourself going there to check out the latest offers only to be disappointed when your search didn't turn up anything interesting.As you've probably come to realize, there are a lot of possibilities when it comes to finding the best deals on TVs, Blu-ray players and other gadgets. But even if it is easier than ever before, there is still so much information that you need in order for these tradesmen and women to be able to offer quality recommendations.Best cable tester ensures that cables are properly connected to all the devices.With accurate, fast and reliable cable testers, you can easily save your business money.The cable tester software is an essential tool for any cable equipment buyer. It helps to assess the quality of a cable, measuring it's resistance and voltage.Cable testers have been in use since the 50's. The need for them is now less, but they are still widely used in the market.The best cable testers can help you to test Ethernet cables, power cables, phone wires and other wired connections. They also include various other inputs and outputs from home appliances like refrigerators, washing machines and dishwashers.The best cable testers can also be used in different situations to find out whether your device is working properly or not. If your computer isn't functioning properly, you should check the cable of it first before taking any action on it immediately to make sure that there are no faulty connections or miswired devices present in the system because of which your computer won't work properly at all. On the other hand if something goes wrong with a certain deviceToday's cable tester software/hardware is very sophisticated and works in a particular niche. This makes it a perfect fit for cable testers who are looking for precise information such as the channel number, the length of the cable and the condition of the cable.While there may be other software that can do these tasks, this software provides them quite well. This is why you should consider purchasing this software to get some competitive edge in your field.
Function of Underground Pipeline Detector in Cable Maintenance
Function of Underground Pipeline Detector in Cable Maintenance
Surface water pipelines refer to water supply, drainage (rainwater, sewage), gas, electric power, communication, heating, industrial and other pipelines. It is an important part of urban infrastructure and the basic basis of urban planning, construction and management. At present, the electromagnetic method based on the law of electromagnetic induction is the most convenient, effective and commonly used in the detection of underground pipelines. Underground pipeline detector is one such device. The receiver measures the change of the secondary field generated by the underground pipeline under the action of the transmitting airport on the ground, so as to judge the spatial position of the underground pipeline. It is generally believed that the secondary field excited by a straight line can be regarded as the electromagnetic field generated by an infinite straight line. The receiving device locates the pipeline and determines the depth according to such electromagnetic field changes. The experimental results show that the measurement results are very accurate without the interference of other pipeline fields. In order to detect pipelines accurately, quickly and efficiently, different detection methods should be selected according to the characteristics of underground pipelines. The buried pipe detector uses the principle of electromagnetic induction to detect the precise direction and depth of underground metal pipelines and cables, and find out the fault points outside the pipeline. The buried pipe detector has the functions of intelligent, graphic operation indication and audio modulation indication of all Chinese characters. It is the most convenient buried pipe detector. The built-in ohmmeter of the transmitter can automatically measure the loop resistance and automatically match the continuous output impedance to ensure the excellent output signal. The instrument can select the coupling according to the needs of practical application. Under the condition of continuous power supply, it can be used to find the path of live cable for testing. Using the 50Hz detection function of the receiver, it can also track the 50Hz power frequency signal sent by the running cable, truly achieve one machine with multiple functions, and has the best performance and cost performance. Its basic working principle is that the transmitter generates electromagnetic wave and transmits the transmitted signal to the detected underground metal pipeline through different transmission connection modes. When the underground metal pipeline senses electromagnetic wave, induced current is generated on its surface, and the induced current propagates far along the metal pipeline. In the process of current propagation, The electromagnetic wave is radiated to the ground through the underground metal pipeline. Therefore, when the underground pipeline detector detects on the ground, the electromagnetic wave signal will be received on the ground directly above the underground metal pipeline. Through the change of signal strength, the position and direction of the underground metal pipeline can be judged. According to the detection principle, underground pipeline detectors are divided into two categories. One is to detect metal markings in metal pipelines, electric / optical cables and some non-metallic pipelines by using the principle of electromagnetic induction, which is called pipeline detectors for short; The other is the use of electromagnetic waves to detect underground pipelines of various materials, which can also be used to find buried objects, commonly known as radar or pipeline radar.
Cause Analysis of Insulation Failure of Power Cable
Cause Analysis of Insulation Failure of Power Cable
1. Insulation aging of insulation fault cables mainly occurs in the later stage of operation, generally in cable lines that have operated for 15 years or more, resulting in a significant increase in cable failure rate. Insulation aging is mainly divided into dendritic aging, electrothermal aging and insulation material aging. The air gap inside the cable insulation medium is free under the action of electric field, which reduces the insulation. When the insulation medium is ionized, ozone, nitrate drum and other chemicals are generated in the air gap, which corrodes the insulation layer. At the same time, the moisture in the insulation decomposes the insulation fiber, resulting in the decline of insulation strength. Overheating will accelerate the aging and deterioration of insulation. The electric dissociation generated by the air gap inside the cable insulation will cause local overheating, carbonize the insulating material and reduce the insulation strength. Cable overload is an important factor of cable overheating. Cables installed in poorly ventilated places such as cable dense areas, cable trenches and cable tunnels, cable paths parallel or cross with thermal pipelines without effective thermal insulation measures will overheat the cables and accelerate the damage of the insulation layer. When the cable insulation operates under the action of electricity and heat for a long time, its physical properties will change, resulting in the reduction of insulation strength or the increase of dielectric loss, which will eventually lead to insulation collapse and aging and failure. The main causes of insulation aging are: (1) improper cable selection, resulting in long-term over-voltage operation of the cable; (2) The surrounding of the cable line is close to the heat source, so that part of the cable or the whole cable line is heated for a long time and ages prematurely; (3) The cable is aged prematurely when working in an environment with adverse chemical reaction with insulation; (4) When multiple cables are running in parallel, one or more of them are in poor contact, resulting in overload operation of other cables in parallel; (5) When making cable accessories, the cable connecting pipe is not firmly crimped, resulting in increased contact resistance and overheating. 2. Accessories: the cable intermediate joint and terminal head are usually completed by the installation personnel at the laying site, and mistakes are easy to occur without paying attention. Cable accessory failure accounts for the main part of cable line failure, which is mainly manifested in composite interface discharge and accessory material aging. The failure of cable accessories is often due to the poor manufacturing process and the carelessness of personnel. During the manufacturing process, bubbles, moisture, impurities and other defects appear in the accessories, resulting in partial discharge and insulation breakdown, which is mainly reflected in: (1) the manufacturing quality of cable intermediate joints and terminals is not high; (a) when stripping the outer semiconducting layer, Damage the lower insulation or there is half a track of particles, dust and other impurities on the insulation surface, or the removal distance of the semi conductive layer is short and the creepage distance is not enough. After the test or operation, the impurities are free under the action of strong electric field and produce electric branches. (b) During the manufacturing process, the crimping quality of the metal connecting pipe is poor, resulting in excessive contact resistance and heating of the joint, or excessive thermal shrinkage, resulting in insulation carbonization, aging and breakdown of the insulating layer, resulting in cable grounding or phase to phase short circuit fault, and may damage other nearby cables. (c) The cable joint process is not standard and the sealing is not standard, so that the insulation is invaded by moisture and moisture, resulting in the deterioration of the insulation of the intermediate joint. In serious cases, water enters into a large area inside the main insulation of the cable, resulting in the overall moisture of the main insulation, the insulation is reduced, and finally the cable breakdown fault occurs. (d) The treatment process of conductor connecting pipe is poor. The selection of crimping die for conductor connecting pipe is unreasonable, and the edges and corners are not polished smoothly. Especially at the edge of crimping die, there are sharp corners, burrs and protrusions, which is very easy to cause uneven electric field at this part, partial discharge during operation, aging insulation, degradation of insulation performance and breakdown fault. (e) The installation size is wrong, the installation position of the stress tube is too low, or the stress cone is not effectively overlapped with the half layer fracture, resulting in the failure of reliable stress evacuation at the semi conductive fracture of the cable. During the test or long-term operation, serious corona discharge occurs at the fracture, resulting in overheating, reducing the insulation, and finally leading to breakdown. (f) The connection of the grounding wire of the cable metal shielding layer is unreliable and does not meet the requirements of grounding resistance, resulting in excessive grounding resistance. When the cable is subjected to overvoltage, the metal shielding layer will produce high induced overvoltage, which will lead to aging and breakdown of the insulating part. (2) During operation, the cable expands and contracts due to the change of load and environmental factors, especially the heat shrinkable accessories can not lose the sealing effect with elastic deformation, forming a respiratory effect between the accessories and the cable insulation layer, bringing moisture and moisture in the atmosphere into the accessories, causing the internal short circuit fault of the cable accessories. Poor quality of cold shrinkable accessories, reduced shrinkage or defective sealing at the parts requiring reliable sealing will lead to external moisture intrusion and eventually cable failure. (3) When making the cable head, due to the high environmental moisture and humidity, reliable dehumidification and moisture drive measures were not taken, the cable insulation was partially affected by moisture, the insulation performance decreased, and developed into a penetrating channel during operation, resulting in cable breakdown accident. 3. The problem of outer sheath is more and more widely used in medium and high voltage power grid. The outer sheath of power cable is the first line of defense to protect the cable. Its integrity is directly related to the safety of internal structure and the service life of the cable. There are three main causes of cable outer sheath failure: (1) hard object damage or external force damage around the cable. There are sharp corners of hard objects at the top and bottom of the directly buried cable that directly contact the outer protective layer. Especially in the road section with vehicles, the sharp corners of hard objects may pierce the outer protective layer for a long time, resulting in damage to the internal structure. In addition, with the change of cable load, the thermal expansion and contraction of the cable itself and the uneven distribution of electric field at the damaged parts, resulting in damage to the insulating layer; During pipe laying, the outer protective layer may be damaged if the steps or inner wall at the pipe connection are not smooth; The outer sheath is damaged due to mechanical construction or pipe jacking around the cable path. (2) Defects and hidden dangers left during construction. During the cable laying construction, the damaged and cracked parts of the outer sheath are in the row pipe, and the personnel cannot find them in time; After running for a period of time, the bending part of 110kV and above cables will crack, the insulation of the outer sheath will be reduced, the metal sheath will be grounded at multiple points, and the circulating current will increase, resulting in thermal aging and breakdown of the insulation. (3) Termite decay. Once a termite erosion site is found, there are often multiple erosion sites on the cable line, which should be paid enough attention. Termite erosion is relatively rare in the northern power grid.
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