Telephone Wire Tracker Buying Guide

Telephone Wire Tracker Buying Guide

2021-10-01
NOYAFA
11

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telephone wire tracker is a highly recommended product of SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED. Designed by the innovative designers, the product is of attractive appearance attracting many customers' eyes and it has a promising market prospect with its fashionable design. Regarding its quality, it is made of well-selected materials and precisely made by the advanced machines. The product conforms to the strict QC standards.NOYAFA brand is created and get through to customers together with a 360-degree marketing approach. Customers are very likely to get pleased during their initial experience with our products. The trust, credibility, and loyalty that come from those people build repeat sales and ignite positive recommendations that help us reach new audiences. So far, our products are broadly distributed worldwide.We have professional staff forming an efficient service team. After confirming the receipt, customers can enjoy worry-free services in a fast manner at Best Cable Tester Supplier in China _ Noyafa. Our after-sales team regularly participate in the service training conducted by industry experts. The staff usually show great passion and enthusiasm about these activities and are good at applying theoretical knowledge to practice - serving customers. Thanks to them, the goal of being a responsive enterprise has been achieved.
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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.
What Is the Difference Between Medium and Low Voltage Cable Fault Tester and Traditional Tester
What Is the Difference Between Medium and Low Voltage Cable Fault Tester and Traditional Tester
Since the buried cable appeared in our life, cable fault detection has become a test of people's work. How to accurately find out the cable fault point through layers of soil requires not only the experience of maintenance personnel, but also corresponding equipment support. Cable fault tester is one of the commonly used detection equipment. Today, we mainly discuss the difference between the medium and low voltage cable fault tester and the traditional one. Difference analysis between medium and low voltage cable fault tester and traditional cable fault tester: first, introduction of fixed-point method of cable fault. There are two kinds of cable fault rough measurement methods: electric bridge method and pulse reflection method. There are the following methods for cable fault fixed point: 1. Acoustic measurement method: acoustic measurement method is used for fixed point, which is a common method for cable fault fixed point from the past to the present. And it is the most effective method. However, the instrument used has developed from a simple acoustic electric amplifier to an acoustic magnetic synchronous fixed-point instrument widely used now. The fixed point of acoustic measurement method is applicable to high-voltage cable, low-voltage cable, directly buried cable, cable trench cable, etc. 2. Step voltage method: step voltage method is adopted for fixed point, which is mainly aimed at the fixed point of outer sheath grounding fault with requirements for cable outer sheath insulation. Now, step voltage method can also be used for fixed point of grounding fault of some directly buried unarmored low-voltage cables and wires. 3. Electromagnetic method and audio method: it is feasible to fix the point with electromagnetic wave or audio method in principle. However, from the current situation, there is no fixed-point instrument with reliable performance and practical application. In other words, the fixed-point instrument using electromagnetic wave fixed-point is still being developed by various scientific research institutions, which needs to be further verified and improved in practice to reach the practical application level. 2、 Introduction to medium and low voltage cable detector (bridge tester): most of the medium and low voltage cable detectors in circulation in the market now complete the function of cable fault rough measurement. Its principle is generally using the electric bridge method, but now it has adopted computer technology and intelligent electric bridge. There are low-voltage bridge, high-voltage bridge and so on. Some instruments also use the principle of ultra-high voltage digital bridge. The voltage applied to the fault point is generally more than 200V, and the most Gao can be added to 20kV. For cable fault with low fault resistance (resistance less than 600m & omega;). The fault distance can be roughly measured with medium and low voltage cable detector. Scope of application: applicable to leakage fault test with low fault resistance value. It is generally used for cable fault test below 6000V & lt; Rough measurement of fault distance & gt Advantages: for cable faults suitable for testing, it is simple to use and has low technical requirements for users. Fool test. In addition, for some fault points, such as some cable joint faults, due to the long creepage distance of the fault point, the fault of flashover discharge cannot be formed. Because the pulse flash method cannot be used to roughly measure the fault distance, the electric bridge method has its advantages. In the actual test, when the insulation resistance of the fault point is lower than 100m, but the high-voltage flashover test (impulse voltage is greater than 20kV), the low-voltage measured discharge current displayed by the operation box does not exceed 5a, and the sound is clear when the ball gap is discharged, which indicates that the fault point has not formed flashover discharge, and the flash tester displays the full-length waveform of the cable. In this case, we can basically conclude that the cable intermediate joint is faulty. The middle head can be excavated directly, and the cable fault pointing instrument can be used for accurate pointing, so as to further diagnose the fault point.
How to Carry Out Fault Location of High Voltage Cable
How to Carry Out Fault Location of High Voltage Cable
The speed of China's economic development is obvious to all. The country's economic development has driven the development of all walks of life, and all kinds of construction work has been strengthened. The construction scale of national power grid is expanding. Although China has also popularized and applied multi-channel high-voltage cable technology, its structure is becoming more and more complex, resulting in multi-channel failure of high-voltage cables. Next, we discuss the problem of fault location of high voltage cable. High voltage power transmission lines have been affected by environmental changes in recent years. The insulation layer of cables is damp due to rainy weather and ponding, the overall overheating in the process of cable use, and the high voltage of cables will not only affect people's power consumption experience, but also cause irreparable loss of economic benefits to relevant power consumption enterprises. How to accurately locate and quickly remedy the fault of multi branch high-voltage transmission line cable has become the focus of power supply departments and power companies. 1、 The construction and analysis of cable simulation model great changes have taken place in the current natural environment, and the natural wear of cable lines is becoming more and more serious in the harsh natural environment. Therefore, the stable and continuous operation of the cable requires the cable protective layer to protect the cable, and the cable protective layer usually plays a key role in protecting the cable. We need to consider the cable, so we should select the power supply equipment matching the cable in the test. However, we should note that when setting the data of the power supply, we need to select the conventional settings of the circuit and resistance, and do not exceed the range borne by the cable. 2、 Simulation and analysis of two-t lines the application of two-t lines is an innovative technology for today's multi branch cable erection, but no country can widely use this technology. We can evaluate the design idea, design scheme, design results and the effect after being put into use in a small scale. We can improve the cable technology in some large cities and areas with complete urban power grid construction. We can transform the original main power supply line into a power supply line of two t lines. If we use this technology, we can increase the investment of the corresponding part in the project and complete it as soon as possible. 3、 Firstly, when the fault location is in Section D, set the fault point in phase a of Section D and carry out the simulation process test. Based on the grounding wire at the beginning of a section, it is concluded that after a problem occurs, the current has a continuous transient process. Then, the metal sheath current that is slowly stable and connected to the fault is large, and the high amplitude reaches 5A. At the same time, the large amplitude of the non fault phase also reaches 1 A. there is no great difference between the current wave detected by this stage and the normal grounding wire. The main route of fault location of high-voltage cable and the route of fault section are cross connected, and the attenuation amplitude of high-frequency voltage will appear after fault. If the insulation layer in the cable breaks down, we can measure the grounding current in different sections and the attenuation amplitude of high-frequency voltage, and analyze the location of cable accident from the measured data.
Technical Specifications of Cable Fault Detector
Technical Specifications of Cable Fault Detector
1. Long test distance: 32km2. Detection blind area: 1m3. Reading resolution: 1m4. Power consumption: 5va5. Service conditions of cable fault detector: ambient temperature 0 ℃ 40 ℃ (limit temperature - 10 ℃ 50 ℃), relative humidity 40 ℃ (20 90)% RH atmospheric pressure (86 106) kpa6. Volume: 225 × one hundred and sixty-five × 125mm38. Weight: 2kg1 traditional cable fault detection method 1.1 measuring resistance bridge method this method has hardly changed for decades. For short circuit fault and low resistance fault, this method is very convenient. The bridge method is based on the principle that when the bridge is balanced, the product of the corresponding bridge arm resistance is equal, and the length of the cable is directly proportional to the resistance. 1.2 low voltage pulse reflection method low voltage pulse method, also known as time domain reflection method (TDR), means that the pulse reflector independently measures the low resistance and open circuit faults of the cable without passing through the high voltage impactor. 1.3 pulse voltage sampling method pulse voltage sampling method, also known as impulse high voltage flashover method, is a test method for measuring high resistance leakage and flashover faults. Firstly, the cable fault is broken down under the DC or pulse high voltage signal, and then the distance is measured by recording the time required for the discharge pulse to go back and forth between the measuring point and the fault point. Pulse voltage method mainly includes DC high voltage flashover (direct flashover method) and impulse high voltage flashover (impulse flashover method). 1.4 traditional method of cable fault location ①acoustic measurement method this method uses the breakdown and discharge sound of the fault point during high voltage impact to locate the * *. ② Dear customers: Hello, our company is a high-quality development group with strong technical force, providing high-quality products, complete solutions and superior technical services for the majority of users. The main products are high voltage cable fault tester, cable fault locator, intelligent cable fault tester, etc. 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!
Model Prototype Exercise: Handheld Electric Screwdriver
Model Prototype Exercise: Handheld Electric Screwdriver
To practice designing 3D low-fidelity prototypes, I was tasked to prototype an OXO handheld electric screwdriver as a new opportunity to expand their business into new product lines.Designing for OXOs Brand IdentityBefore sketching out design ideas, I wanted to familiarize myself with the OXO brand, hoping that the form of my design will match with OXOs brand identity. OXO incorporates comfortable and easy to use tools, while also applying simple,universal design. When I was sketching, I wanted to prioritize comfort, which is why the designs for the screwdriver include a hand grip area for the user to comfortably hold the screwdriver. I also attempted to emulate the simple designs of OXO, because the interfaces to be as minimalist as possible.Additionally, the sketches addressed the product requirements of a fluid speed control, a automatic screw driver selection (shape and size), direction mechanism (screwing in vs. screwing out), and a progress digital readout (number of screws in and out).PrototypeI created a handheld electric screwdriver prototype that is 6 inches long. With rocks and Easter eggs filled with rice inside, the prototype weighs one pound, emulating the actual weight of the product. Shape & FormI wanted the shape and form of the screwdriver to be comfortable and intuitive for the user. The handle on the screwdriver is slightly curved to emulate the natural grip when holding an object around your hand. I also included tape around the area to represent different material that would be incorporated for comfort. Additionally the handle is suitable for left-handed users or right-handed users.FunctionalityThere are several functionalities that make the prototype, including speed control, screw driver shape/size selection, screw driver direction, and a digital readout component. The screwdriver will also have a rechargeable battery. Fluid Speed Control Mechanism: I incorporated a fluid speed control under tucked in the handle for easy access to change the speed of the screwdriver while holding it at the same time. The sensor will capture the pressure of the grip and change the speed accordingly. The white thumbtack shown in the left image above is located where ones index finger would be, a intuitive hold and position to be controlling the speed. Screw Driver Selection Mechanism (shape/size): For the screw driver shape and size selection, this screwdriver supports 2 different head changes (Phillips or flat) and 5 different sizes. This screw driver shape and size is presented on a touch screen, where the user can tap to select different heads and sizes. After the user will press set for the screwdriver to automatically change shape/size. This interface is above the gripped area to avoid accidental switches in screw driver. Additionally the interface faces the user when they hold onto the screwdriver, allowing for easy visibility of the current setting of the screwdriver.Screw Driver Direction Mechanism: The screw driver direction mechanism is located on the side of the screwdriver with a slider mechanism to change the direction based on if the user is screwing in versus out. Digital Readout Component: The digital readout component shows the number of screw in and out below the direction mechanism. The reset button allows for the user to set the count back to 0.Rechargeable Battery: The screwdriver is rechargeable and the battery is placed inside the bottom of the screwdriver. AnalysisAfter finalizing the prototype, my peer members were able to give critiques and I was able to conduct one in-depth user test on all functionality. Click on the link below to view a snippet of the user test.What went well?Many users enjoyed the fit and weight of the prototype, explaining that the curved form of the screwdriver fit well with their grip and how they would intuitively hold the screwdriver. Users found the reset button on the count of the number of screws in and out practical and functional even thought it wasnt a product requirement.The speed control was intuitive for everyone, knowing that the harder they pressed the faster the head would turn. All users found the button placed in a comfortable position where their index finger was. The placement of the rechargeable battery was intuitive for all users.What needed improvement?Many users were confused with the digital readout component that indicates the count of screws in and out. Manyusers were unable to initially understand what the numbers stood for. There was uncertainty with the set button, expressing confusion on the ordering of changing the heads of the screwdriver. If the set button should be pressed before or after selecting the shape and size.The placement of the reset button may get in the way when gripping the screwdriver, possibly causing unintentionally reset of the digital readout. Additionally there was no way to reset only one of the digital readout numbers. So if a user wanted to reset only the number of screws in, this would not be possible.Takeaways & Next StepsOverall based on this analysis, the most effective component of the prototype was the shape/form of the screwdriver as well as the fluid speed control mechanisms. Both were praised and intuitive for users. However, the least effective component was the interface of the digital readout component. By using icons paired with labels of in and out the digital readout component can be more clear on what is being represented. Additionally if the slider is placed between the label and the actual readout component, the label would be on the top, possibly better indicating what the digital readout is and what the in and out slider does.Next steps would be to improve on the interfaces of the digital readout component, since this was the least effective functionality. After improving on the new interface, the next step is to do another round of critique and user testing. RELATED QUESTION Which is the best natural face mask for dark and oily skin? Hello there,The Best Face Mask for Oily SkinOily skin can be a major cause of acne because the pores are constantly clogged. This is why you need a great mask to help get rid of excess oil in the pores and on the skin.This mask works hard at regulating oiliness, soothing acne flare-ups and soothing the skin. To make the mask, you will need:1 apricot1 tablespoon of natural yogurt1/2 teaspoon of cosmetic clayDirections:Blend the apricot in a food processor. Add the yogurt and the clay and mix it until it becomes a smooth paste.Apply the mixture to your face and allow it to dry for 20 minutes before rinsing it off with lukewarm water. We love DIY face masks because of their easy to make recipes and all-natural ingredients.Heres some best face mask for all skin problems. You can make it easily at your home.1. The Activated Charcoal Acne Face Mask2. The Avocado & Honey Acne Blasting Face Mask3. The Honey Acne Face Mask4. The Cucumber Acne Face Mask5. The Turmeric Face Mask for Acne6. The Aloe Vera Acne Face Mask7. The Cinnamon Acne Face Mask8. The Apple Cider Acne-Fighting Face MaskGet the face mask recipe and benefits here:22 Of The Best Natural Face MasksI hope this might be help you to get rid of oily skin.Thank You!
A Brief Guide to Selecting Cable Length Testers
A Brief Guide to Selecting Cable Length Testers
The LinkRunner LTRA offers a variety of cable testing techniques, including TDR, wiremapping, office identification and toning. The LTRA is designed to help troubleshoot wiring problems such as excessive cable routing, cable breaks, wall panels, patch panels, etc. It uses a combination of TDR and resistance measurements to map the wire, measure cable length and detect anomalies such as short, open or split pairs.The LRAT can measure an accurate cable length of 100 m or less with an accuracy of plus or minus 2 m. It can also be used to test terminated cables connected to an internal cable mapping port (WMAP) or an external cable identification accessory, as well as undermined and open cables. For pre-assembled and non-assembled cables, the fault detection is accurate to within 0.8 m of the error distance.This tester is a wiremapper that checks connections for CAT 5E / 6 certification, but can also test performance at higher frequencies. The threshold for the low voltage resistance is set insulated for 5 mO to a contact resistance of 0.1 O. This is measured with an embedded resistance at 100 O (1 mO x 1) to achieve an accuracy of less than -0.1 o (5 mO).In fact, certification testers can test wire diagrams, length attenuation, and crosstalk from one connection to another, helping you troubleshoot and save the results in a printed report for the customer. Cable certification testers are automated, so it's so easy to get a pass or fail at the touch of a button. Installers use certification testers to test cables that are being laid.There are a large number of cable testers on the market today, which means that there may be the right device for your purposes. To help you find the best network cable tester for your use I have compiled a list of test products that work well. As someone with extensive experience as an electrician, I can say that the Elegiant Network Cable Tester is the best tool for testing cable connections.I came across the Elegiant Network Cable Tester while working on establishing a LAN connection for a local company. As a consumer, I used the handheld network cable tester with RJ11, RJ12, RJ45 for the Cat 3 types Cat 5E, Cat 6 and Cat 6A. The broad compatibility of the device does not complicate your work in the analysis of cable connections.Cable Prowler (tm) provides complete cable testing for all categories of network, coaxial and telephone cables. Selecting, selecting and purchasing a suitable network cable tester is a complicated and challenging task. Purchasing the right network cable tester can save you a lot of inconvenience and trouble.Includes low-voltage and high-voltage subsystems, HVX-compliant automation, enabling extended testing of insulation resistance, dielectric breakthrough, Zener diode breakthrough, voltage upgrade, 4-wire measurements, and advanced measurements. With the changing landscape of corporate cabling, there is a demand for testing equipment you can rely on. Hopefully this article has helped you choose the best network cable tester for your profession and field of work.Advanced measurement options provide increased x5 / 2 wire resistance resolution for backplane, complex networks, capacitors, wire pairs, capacitors, twist pairs, and cable length testing. Copper remains the first choice for telephone data and video lines. Integrated Intellitone digital / analog tones are located on the cable or wire pair in the active network.It is an expensive device that requires trained operators and many failures due to problems with the wirecard. Other crews use low-cost cable ties to ensure the connections are correct before the certification tester is turned on. Instead of letting the crew find and fix their own wiremap problems, tests and fixes can be made before the cable is installed, and tester costs are not wasted on simple problems.
HYC Exclusive Patented Design  Polarization Maintaining(PM) Optical Fiber Connector
HYC Exclusive Patented Design Polarization Maintaining(PM) Optical Fiber Connector
What is Polarization Maintaining(PM) fiber?Theoretically, the fiber is a circular core which should not produce birefringence, and the polarization state in such a fiber will not change during transmission. In practice, there is always some external forces or other reasons which makes the fiber uneven or curved, and will cause a small amount of birefringence. When the fiber is subject to any external interference, such as wavelength, bending of the fiber, temperature and other factors, the polarization state of light will become chaotic when transmitted in polarization-maintaining fiber. Polarization Maintaining Optical Fiber (PM Fiber) is such a specialty fiber with strong birefringence that is generated by the design of optical fiber geometry. It can effectively solve the problem of polarization state change by eliminating the effect of stress on the polarization state of incident light. If the polarization of the light incident on the fiber is aligned with one of the birefringence axes, the polarization state will remain even if the fiber is bent. This polarization maintaining feature is extremely important for some special applications that require a polarized light input.How does the polarization maintaining (PM) patch cord work?Polarization maintaining(PM) patch cord maintains the coupling alignment of two Polarization modes by precise connector keys. Compared with the traditional optical fiber patch cord, the PM optical fiber patch cord has the advantages of polarization-maintaining optical fiber transmitting polarized light signal, keeping the direction of linear polarization unchanged, improving the coherent signal-to-noise ratio, and realizing high precision measurement of physical quantity. The polarization maintaining connector is an important component of two polarization maintaining fiber coupling, which ensures that the polarization mode of two PM optical fibers maintain the original polarization state of polarized light, and maintains a high extinction ratio for transmission. This requires precise docking of the slow or fast axes of the two fibers to minimize the angle error. By aligning the polarization direction of the polarized light with one of the axes, the polarization component assigned to the other axis is small, thereby maintaining the polarization state of the transmitted light. The polarization Angle and extinction ratio reflect the degree of polarization.360 ferrule rotation adjustable Polarization Maintaining(PM) optical fiber connectorTo meet the requirements of some special applications, HYC has developed a new type of polarization maintaining connector. HYCs exclusive patented design of this polarization-maintaining connector has a 360 ferrule adjustable. During the process of assembling, the polarization axis of fiber is aligned with the connector key by rotating the ferrule until the polarization axis is aligned with the connectors keyway. Compared with the traditional fiber adjustment method, it takes a shorter time to operate, which greatly improves the assembly efficiency. The polarization maintaining angle can be controlled within 1, and the high extinction ratio is maintained above 25dB. PM fiber patch cord products have the advantages of high precision, low loss, ultra-high extinction ratio, convenient manufacturing technology, high efficiency, higher maneuverability and patent protection, etc. They are widely used in many fields such as aerospace, navigation, unmanned driving system, communication, highly sensitive interferometer, poly-deviation wavelength division multiplexer, and other fields.HYC Co.,LtdHYCis a national Hi-tech optoelectronics company engaged in R&D, manufacture and marketing of fiber optical products. Providing professional product and service for fiber connectivity,WDM, PLC splitter and high density datacom cabling. HYC products and solutions widely applied in 4G/5G, Data Center and Cloud Computing industry
How to Quickly Locate Cable Faults
How to Quickly Locate Cable Faults
With the different cable laying methods, the difficulty of cable fault location is gradually increasing. 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 the most difficult. When the fault nature is simple, the special cable fault location equipment can be used to 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. How to quickly locate cable faults? 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.
Best Cable Tester and Reviewer
Best Cable Tester and Reviewer
The introduction of cable testerA cable tester is a device that is used to test the quality of a cable. It can be used when people install their first home network to make sure that they have everything in place and are ready to connect all the devices.When people are setting up their first home network, there is always the fear that they might not have everything in place to connect all their devices efficiently. That's when they need a cable tester like this one.Cable testers come in different shapes and sizes, but this particular one makes it easy for users to test plugs and cables with ease. It also comes with an on/off switch for convenience purposes. There are multiple companies selling these types of products like Amazon or Best Buy, but it’s really important that you go through reviews before buyingTips for cable testerCable testers are the best way to ensure that you have the ideal cable for your TV. However, they come in a wide range of shapes and sizes.This guide contains tips to help you find the right one for your needs.How to use cable tester?As a cable tester, you need to identify if your cable has any problems. Here is a step-by-step guide of how to use a cable tester.If the connection is not strong or there are no picture and sound, troubleshooting starts by using the remote control provided in the package. You should also check if you have a faulty power cord as it may cause intermittent connections.When trying to fix the connection, make sure that you have an HDMI port on your TV and that it is connected with an HDMI cable. If both of these are not present, it causes signal loss and prevents viewing or sound from existing on your TV or speakers.The specifications of cable testerAs the technology is developing, more and more people are beginning to use these cable testers. Cable testers are designed with two screens that show both live video as well as a map of the cable's conductor.The manufacturer offers a three-year warranty on the tester. It also has a wireless remote control for viewing and controlling the program in real time.The product instructions of cable testerIn designing a new product, an engineer must consider many things - the needs of the customer, the needs of the company, and how to make sure they are meeting those needs. All of these factors will determine what instructions will be written for a product. In this section, I'm going to focus on product instructions and what they need to cover.The product instructions are an important part of your customer relationship. They should provide information about what your current customers need and how to use your products in detail. This includes wiring diagrams and other helpful information that can help people use it correctly and effectively.Product instruction should also include warnings about safe use as well as safety concerns about using it improperly could lead to personal injury or deathThe application of cable testerThe cable tester comes in handy during the installation of cables and wires, where it is used to ensure that the cables are safely and securely fixed.The cable tester facilitates the installation process by providing a safe way for users to connect wires without difficulty. It also provides an easy way of testing cables and ensuring that they are working properly before continuing with the installation process. Despite being a rarely used device, it is one of those indispensable tools which can be found in every home or office.The device has a simple design - it has two pieces of metal at either side which serve as terminals that connect to different points on data cables or electrical wires and provide an easy way for users to test if there is any voltage or current flowing through them.
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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