Laser Length Measuring Device Buying Guide

Laser Length Measuring Device Buying Guide

2021-10-24
NOYAFA
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laser length measuring device has greatly affects on SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED. It passed through the extremely harsh quality control and inspection. Materials are the soul of this product and well-selected from top grade suppliers. Long operation life absolutely manifests superior performance of it. It is proved that this quality product has been won high recognition.We are vigilant in maintaining the reputation of NOYAFA in the market. Facing with the international market, the rise of our brand lies in our persistent belief that every product reaches to customers is of high quality. Our premium products have helped customers achieve their business goals. Therefore, we are able to maintain long-term relationships with our customers through providing high quality products..At Best Cable Tester Supplier in China _ Noyafa, customers can get laser length measuring device and other products together with more considerate services. We have upgraded our distribution system, which enables a faster and safer delivery. Besides, to better cater to customer's actual need, the MOQ of the customized products is negotiable.
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Design Features of Cable Fault Locator
Design Features of Cable Fault Locator
Cable fault locator is a set of comprehensive cable fault detection instrument. It can test the faults such as high resistance flashover fault, high and low resistance grounding, short circuit, cable disconnection and poor contact. The cable fault locator is equipped with an acoustic pointing instrument, which can be used to accurately determine the accurate position of the fault point. It is especially suitable for testing power cables and communication cables of various models and different levels of voltage. The cable fault locator adopts a variety of detection methods and applies the achievements of contemporary advanced electronic technology. Using computer technology and microelectronics technology, it has the characteristics of high intelligence, complete functions, wide range of use, accurate test, convenient use and so on. It is very important in civil aviation maintenance to detect aircraft cable fault; According to the characteristics of aircraft cable, a method that can effectively test and diagnose it, low voltage pulse method, is proposed, and an aircraft cable defect detection and positioning device is designed by using single chip microcomputer and CPLD technology; The positioning instrument is mainly composed of three parts: signal acquisition circuit, system control circuit and human-computer interaction circuit; At the same time, two sets of product vibration are adopted, which not only ensures the high-speed signal acquisition, but also meets the low-speed processing of the system. It has the characteristics of low cost, portability and dexterity, accurate test and so on; At the same time, in addition to being applied to aircraft cable maintenance, it can also be further applied to short-distance cable testing and defect detection in telecommunications, electric power and other departments. 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 main products are intelligent cable fault tester, underground cable fault tester, street lamp 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!
Detection Method of Power Cable Fault
Detection Method of Power Cable Fault
1. Rough measurement of power cable fault (1) bridge method bridge method is a classical method of power cable fault location, which has a long history. Including DC resistance bridge method, DC high voltage resistance bridge method and capacitance bridge method. The resistance bridge method can only test some cable faults with low insulation resistance between single phase and ground or between two phases; High voltage bridge method is mainly used to test single-phase grounding fault or phase to phase and ground fault of main insulation with resistance greater than 10k Ω but less than megohm; The capacitance bridge method is mainly used to test the open circuit and broken wire fault of cables. The bridge method is relatively simple and convenient to operate, but it needs to know the original data such as the accurate length of the cable in advance. At the same time, it is not suitable for detecting high resistance faults. Most of the actual power cable faults are high resistance faults. Because the bridge current is very small when the fault resistance is very high, it is difficult for general sensitive instruments to detect. (2) Traveling wave method 1) low voltage pulse method low voltage pulse method is mainly used to measure the fault distance of open circuit, short circuit and low resistance faults of cables; At the same time, it can also be used to measure the cable length, wave velocity and identify and locate the middle head, T-joint and terminal head of the cable. Test principle: input a low-voltage pulse signal from the test end to the cable, and the pulse signal propagates along the cable. When encountering the impedance mismatch point in the cable, such as open circuit point, short circuit point, low resistance fault point, etc., a reflected pulse will be generated. The position of the fault point is calculated according to the round-trip time difference DT between the reflected pulse and the transmitted pulse and the pulse propagation speed v. 2) High voltage pulse method high voltage pulse method uses high voltage signal to turn cable fault into short circuit or low resistance fault instantly, so that the reflection coefficient of fault point is close to - 1, and the fault point almost produces total reflection. There are usually two basic flashover methods, namely direct flashover method and impulse flashover method. When testing cable fault by flashover method, the reflected wave formed at the cable fault point is high-voltage pulse wave, which cannot be displayed directly through the instrument. Generally, a sampler is needed to convert the high-voltage pulse formed at the fault point under the action of high voltage into the low-voltage pulse signal required by the instrument. According to different sampling methods, it is divided into voltage method, current method and voltage induction method. Wherein, R1 is the voltage dividing resistance, R2 is the sampling resistance, LP is the current sampler, C is the energy storage capacitor and B is the transformer. DC high voltage flashover method (direct flashover method): apply DC voltage to the fault cable to make the fault click through the room for discharge and flashover. Then, the fault distance can be calculated according to the transmission speed V of the traveling wave in the cable. The direct flash method is mainly used to test the flashover high resistance fault of power cable, and can also be used to test the leakage high resistance fault with particularly high resistance but lower resistance compared with the intact phase. Figure 6 shows the principle circuit of direct flash test. Impulse high voltage flashover method (impulse flashover method): due to the large equivalent internal resistance of DC high voltage power supply used in direct flashover method, the power output power is limited to a certain extent. For most leakage high resistance faults, direct flashover method cannot be tested. The impulse flashover method uses the high-capacity charging capacitor as the DC high-voltage power supply, which is connected to the fault cable to cause the flashover and discharge at the fault point to form an instantaneous short circuit. It is mainly used to test the leakage high resistance fault of power cable, and can also be used to test the low resistance, open circuit and flashover high resistance fault of power cable. The test principle circuit is basically the same as that of the direct flash method, except that a spherical gap is inserted between the energy storage capacitor and the cable, as shown in Figure 7. 2. Precise measurement of power cable fault point (1) acoustic measurement method uses the sound wave generated when the fault point is discharged for fixed point. The sound sensor detects the sound signal above the power cable. The place with loud sound is the location of the fault point. The farther away from the fault point, the smaller the vibration sound. (2) When the fault point flashover discharges under the action of impulse voltage, the acoustic magnetic synchronization method receives the electromagnetic wave and vibration sound wave generated by the discharge of the fault point at the same time, and judges whether the measured signal is generated by the discharge of the fault point to accurately judge the location of the fault point. (3) The audio induction method adds a certain power low-voltage audio signal to the fault of the cable at one end of the tested circuit. When the tested signal is transmitted to the short-circuit or disconnection point, it cannot continue to transmit along the cable, so there will be obvious signal size changes on both sides of the cable fault point. If the signal changes are detected through the receiver above the cable path, The location of the fault point can be determined. At the same time, the accuracy and integrity of various basic data of cables are also very important to improve the efficiency of fault point finding, such as cable laying direction, total cable length, distribution of cable intermediate joints, etc.
Cable Tester to Test Your Home Network
Cable Tester to Test Your Home Network
The introduction of cable testerA cable tester is a market expert who looks into a specific product and finds flaws in it. They are usually looking for products that are either faulty or un-performing, so they make sure to find out which product is the most likely to break. Although, their job is not necessarily related to the product itself, but they look for any sort of issues with the basic properties of an item.Tips for cable testerA cable tester is a person who reviews the quality of cables in different locations and makes sure that they meet the standards. They do this by making inspection decisions, often at short deadlines.The most important thing to remember while reviewing cables is that no part of a cable should touch the ground or any of its power sources because doing so can affect the performance and reliability of cables in those places. In addition, when inspecting cables for damage, there should be other requirements as well - for example, according to ISO-IEC 61631-1 (or equivalent) standard, cable manufacturers have to report any kind of deviation from safety standards.How to use cable tester?This page will provide you with information on the best way to use cable testers.In this article we are going to discuss about how to use cable testers and their pros and cons.The specifications of cable testerThe cable tester is a very important part of the electronics system and it's always in high demand. Also, the industry experts are always looking for more information on this subject.The product instructions of cable testerIt is now possible to test cable products, determine the quality of their performances and reviews, without having to physically go inside the box.##Section topic: Movies and television series of the next generationIntroduction: “The new generation” refers to all people born after 1985 and up. The biggest trend in this context is the increase in the number of young viewers who are looking for different kinds of content. This creates a big opportunity for film makers and television producers. For example, recent films such as "Black Panther" have been successful because they capitalized on this trend by making a character who was not like other characters that had appeared before. It seems that there is an opportunity for movie makers to get inspiration from these trends in order to create feature oriented movies. The same applies forThe application of cable testerThe application of a cable tester is a process that an electrician uses to check the wire and cable system in a building or industrial site before the building is occupied.
Basement  Businesses
Basement Businesses
So, you want to be your own boss. And you figure a business in your basement is a good way to set up something to be a boss of. Trouble is, you'll probably end up with more bosses than you ever had - every customer who gets you on the phone.Don't worry. Your own business has other benefits, and you'll get to remember a whole lot of them every April, when you find out how much of your money you're keeping out of the tax collector's hands.Your small business doesn't have to be in the basement, of course, but that location often gives people the biggest tax writeoff, says chartered accountant Sheldon Buchalter. If your home is a bungalow with a big full basement, you may well be able to claim half of many of the costs of your house. Buchalter shudders at the number of self-employed people who don't know they can claim the cost of a home office, or forget about it from one April to the next."I see it all the time," he says. "I had one guy who had been missing a tax deduction of five grand a year for the last four years. That's close to 10 grand he shouldn't have paid the government."Buchalter himself has an office in his home as well as his cheerfully cluttered, fountain-bedecked place of business at Tepperman Buchalter LLP. He doesn't try to claim the expenses at home, though."You know what they say. Pigs get fat. Hogs get slaughtered," he says. "I'm not using the office at home every day. I use it maybe 10, 15 times a year. It has to be regular, continuous use to be claimed. It's intended for when you have no other office or place to do business."What Buchalter does do, though, is claim for the mountains of clients' files he stores in his basement."If I rented a storage space, it would probably cost $300 a month. Instead, our company pays me $75 a month."The situation can be much more clear cut if your home office is the only place you have to do business. You may not, in that case, even have to set aside a room in the house that's used for nothing but business, although you're much safer with the tax collector if you do. Either way, you need to figure out how much of the expenses for your entire home could reasonably apply to the business.The Canada Revenue Agency prefers that you get a tape measure out of your tool drawer, but Buchalter will have none of that.He usually tells his clients to figure things out on the basis of one floor, say, in a three-floor house, or one room out of however many you have, not counting bathrooms or closets, no matter how big they are. So what's eligible? "You can claim your cleaning lady," Buchalter chortles, "or at least a part of her."Other claimable expenses are more obvious. They include mortgage interest (but not the part of the payments that goes toward the principal owing), property taxes, heat, hydro, water and home insurance. "Don't forget cutting the grass and shovelling the snow," Buchalter says. "You have to make the place attractive for the clients." Repairs and renovations come into the picture, too, but they're a tougher call in terms of what to claim, and tax advisers and collectors may have differing opinions on what's legitimate and what's not."I tell my clients not to claim any portion of general house repairs," Buchalter says. He points to a new roof as an example. Sure, your office won't be much good to you if the rain is as bad inside as out, but then the house won't be habitable either, and won't be worth anything when you go to sell it.Similarly, don't claim the cost of a major renovation - tearing down and putting up walls, and the like - to create your home office.Besides, that kind of work could easily cost $20,000 or more, and that's not the kind of money you can claim as an expense in any one year. Meanwhile, the courts have been pushing the tax collector into a kinder corner in recent years when it comes to expense claims for home offices."You can have a bit of personal use in a home office these days, and CRA still says okay," Buchalter says. "That's a big change in recent years."Buchalter doesn't like to go too far with the tax rules."I tell people they can't use their living rooms or dining rooms as a home office," he says. "But a bedroom or a den is okay."Getting back to the computer in your home office, if you bought the machine since March 2007, you can write off 55 per cent of the cost in the first year, with the rest to follow in later years. That's up from only 30 per cent to start - and may get a little closer to the speed with which computers collapse into the category of obsolete and worthless.All the deductions you do take, though, can add up, so it's not surprising that the tax collector has thrown a wrench into the works. You have to make enough of a profit on your business to cover the home-office expenses, or you don't get to claim them in the current year.The tax collector is giving you more latitude with your other expenses, producing a loss in your business even when you have a "day job" and are using the business loss to reduce the tax you owe on your regular employment income.Whether you're in a home office or an outside office, however, the Canada Revenue Agency may take exception to the kind of business you run and whether you're allowed to claim expenses against your revenue at all."It's the hobby issue," Buchalter says. If you start a mortgage lending business, even the tax collector isn't likely to accuse you of having so much fun that you shouldn't be allowed to deduct expenses. But if you love collecting stamps, and then decide to go into the business of buying and selling them, and you lose money ..."
Cable Grounding Troubleshooting and Precautions
Cable Grounding Troubleshooting and Precautions
There are three main reasons for cable grounding fault. First, cable manufacturing defects are unqualified products; Second, poor operating environment, natural aging and external damage; Third, the installation is not standardized and the wiring is rough. There is only one root cause of grounding fault --- the insulating material of the cable. China's large-scale ground power stations are generally located in the West. These places are generally desert, saline alkali land, large temperature difference in the daytime, serious rat damage and very humid environment. For cable buried laying, the filling and excavation requirements of cable trench are relatively high; The operating environment of the distributed power station cable is no better than that of the above ground. The cable will bear a very high temperature, which is measured and controlled by technicians. The roof temperature can even reach the high temperature of 100-110 ℃. The fire and flame retardant requirements of the cable and the high temperature have a great impact on the insulation breakdown voltage of the cable. Therefore, the following points should be considered in the type selection design: 1. The insulation performance of the cable 2. The moisture-proof, cold proof and weather resistance of the cable 3. The heat-resistant and flame-retardant performance of the cable 4. The laying mode of the cable 5. The conductor material of the cable (copper core, aluminum alloy core and aluminum core) 6. The Section specification of the cable
How to Make a Handmade Vfl Fiber Tester
How to Make a Handmade Vfl Fiber Tester
Inspection with a red light source in a fibre optic network requires a number of connection / separation operations. Optical troubleshooting devices illuminate fibers that are defective or damaged connectors, patched cords, defective splices, splice trays that are too narrow, or fibers that are bent into gear trays. The choice between perm output mode for continuous error illumination or flash output mode facilitates fault locating. Visual Troubleshooting Devices (VFL) are an important tool for locating defective or in some cases excessive bending in fiber optic cables. A visual fault locator produces high-intensity red laser light when a fiber optic ends in a factory-polished fiber optic connector. VFLs are optimized for use with singlemode fibers called OS1 and OS2, but can also be used with the multimode fiber families OM1, OM2, OM3, OM4 and OM5. The VFL is also used as a tester to check fiber-to-cable continuity by tracing the fiber-to-fiber for faults such as brakes, faulty splices, sharp vessels, etc. In the fiber-to-fiber cable. A visual error locator, also known as visual error detection, is used to locate errors. And of course the technician must be able to see the cable to locate a fault. It is a cost-effective method to detect defects in the fiber optic, such as sharp curves, broken or faulty connectors, and other defects that transmit red or green light. A visual fault locator (VFL) is a basic fiber optic troubleshooting for fiber connections. It is also known as Visible Laser, Fiber Fault Detection, Fiber Fault Detection, or Visual Fault Detection and is available as a red laser or light design that injects visible light energy into the optical fiber. The optical time domain reflectionometer (OTDR) is used as a fiber optic cable tester to test optical losses. Using a high-intensity laser light that emits predefined pulse intervals and is connected to the cable at one end, the cable is guided through an OTDR to analyze the backscattering of the light and return to the source location. It locates errors in the OTDR (dead zones) and allows the identification of fibers from one end to the other. The One-End Fiber Test is a method used by fiber optic testers to analyze a loss and determine its location for installation, maintenance and troubleshooting. The Hobbes Fiber Checker Pro and Visual Fault Locator (VFL) can be used to inspect and detect fiber optic cable defects. With VisifaultTM and VFL you can diagnose and repair simple fiber connection problems and flukes in the network. Whether it's installing new fibers or troubleshooting an existing network, the Visual Fault Identifier is a useful and convenient kit. You can diagnose fiber-optic connection problems with fiber-optic cables or fiber-optic pigtails using a visual troubleshooting device. Some fiber optic troubleshooting devices are equipped with adapters that are not compatible with your connector type, so use an additional adapter if necessary. VFI and VFL are ideal tools for locating the large number of problems that can occur at connection points and fiber optic cabinets hidden from OTDRs, blind spots and dead zones. Sharp curves, breakages, faulty connectors and other faults such as leaks and lamps allow technicians to quickly detect defects. Colors can be difficult with red laser light, but optical error localizations such as brown, black and green (e.g. The signal transmitted in fiber optic cables is between 1,300 and 1,650 nm wavelength, which is invisible to the naked eye. Lower wavelengths such as 630 nm and 635 nm are bright enough to locate disturbances easily, but cannot travel much higher than 670 nm wavelength. Several manufacturers choose wavelengths below 650 nm for their optical fault spot specification, which can cover a distance of 5-8 km from the center of a singlemode fiber with minimal attenuation. The Noyafa Power meter uses absolute and relative power measurements at 50 and 26dBm at 850, 980, 1300, 1310, 1490, 1550, 1625 and 1650nm wavelengths. The Fiber Checker Pro is a pen-like design case that makes it a portable and practical tool for checking fiber optic cables. Rhodium Plated 925 Silver 1 Nut Pendant 2.4 Necklace Leader Metal Impeller Integration for Superior Durability. The vinyl we use is designed for outdoor vinyl for 10 years, 3 AA batteries are required (not included). Easy to assign and show a new look, contact us for return / exchange permission within three days of delivery date and mark me on your photo with sugar. Filled non-commercial plaster on glass tube, topped with a layer of natural sand and hooded raincoat to facilitate any outdoor activity. The same attention to cleanliness applies to reference cables and test equipment connections. When using a VFL as an optical fault location fiber tester, fault location and eye safety are important. The VFL uses a high intensity laser light source and its fiber core is illuminated so that it can be viewed with the naked eye.
Free Wire Tracker
Free Wire Tracker
Developing a good wire tracker would be one of the best things for any copywriter. This is because it will maximize the number of prospects you get to speak with and increase your revenue.The best wire tracker will tell you how many prospects have responded to your message, what they bought, which products they've tried and why. You can then read this information out loud during phone calls and in emails. This is crucial for turning your leads into sales!A wire tracker is a tool that allows you to find out what your competitors are working on. It shows you the products and services your competitors have launched, in case you need to know how to develop an effective marketing strategy.This article is relevant for digital agencies like us who often work with our clients and partners, who get involved in multi-channel marketing. This tool helps us identify opportunities, measure growth and feedback from customers.In the current digital era, it's becoming more and more frequent to use multiple platforms to share content. One such is Wire Tracker. The service is a mobile app that helps clients easily share content through messaging (text, image or video) by just tapping on the relevant options and pressing “Send” to send a message.There are many ways to track your copy. You can type it into a document or use an online tool. But which one is right for you?The best way to manage your time is by reducing it. The best way to do that is by using a wire tracker app.Wire trackers are a tool that helps in tracking the creation of content. They can be used on multiple channels, such as email, social media, blogs and so on. Wire trackers help us keep track of the work we are doing by providing us with a comprehensive overview of our work and allowing us to have an overview of our progress in completing tasks without having to keep track ourselves manually.Wire Tracker is a tool to help writers and copywriters to identify and track the words they use, those that come up in the content that they write.Wire tracking is a complex task that needs to be done by the best copywriters. They have to be able to understand the audience, present them with a compelling and relevant message, and craft innovative content that will convey the right message to their chosen audience.A wire tracker is a software application that allows you to keep track of your email and social media campaigns. It does this automatically, while you are busy with other tasks. No need to constantly check up on the status of your campaigns. It can also help you manage different strategies for each campaign and send out notifications when specific events occur or trends break out.Wire trackers can be used to automate the publishing process:Section topic: How can I improve my content writing skills?Introduction: A good content writer should be able to write a great first draft for each article they write. They should know their craft and be able to make sure their work will get published, so it does not suffer from editorial errors or lack of impactful elements. They should also be aware about how marketing works,The AI technology is a great way to automate repetitive tasks. For example, in the past, when you had to track all the content created by your staff, you would have to manually count them and check whether they were satisfied with their work. Now with Wire Tracker, you only have to count them and see if they are satisfiedWire Tracker is a tool that will not only automatically analyze all the content in your organization but it will also show how many people contributed to it. It can provide concrete evidence of what works and what needs improvement.Best Wire Tracker is a premium content creation service that offers top quality content for short period of time. It offers the best experience and features to its customers.We should not think of these AI writers as a replacement for human content writers. They just provide assistance to the content writers by getting rid of writer’s block and generating interesting and relevant ideas at scale.AI writing assistants are increasingly getting popular in the workplace. Some companies use them when they need to generate content for a specific topic or niche. While digital agencies use them to generate all kinds of content for their clients, but since it is very convenient, it has become one of the top trending topics in 2018 with businesses spending more money on this type of marketing automation service than ever before! The reason being that AI writing assistants
How to Contact Your After-sale Service Division?
How to Contact Your After-sale Service Division?
This will be emailed to you once the 4 in 1 cable tester are delivered. Tracking info will be attached so that you can follow the logistics. Any questions can be asked after the delivery.SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED concentrates on developing high-quality products such as 4 in 1 cable tester and 4 in 1 cable tester. At the same time, it also guarantees the upgrade and maintaince of 4 in 1 cable tester. We have successfully applied for patents of technology for 4 in 1 cable tester.We are there to support you with our dedicated, highly trained staff. Inquire now!· Related Questions:1. What services are offered for 4 in 1 cable tester?NOYAFA's services don't restrict to supplying 4 in 1 cable tester. Customer support is available to requirements. One of our key values is that we never leave customers alone. We promise we'll take good care. Let's find out together the correct solution for your problem! ——————— 2. Does NOYAFA have forwarder?At NOYAFA, we work closely with logistics partners so that we can deliver your products promptly. We have built stable partnerships with reliable and experienced logistics companies. Whether it is sea freight or air transport, we can meet your requirements and ensure the accurate, safe, and on-time delivery of your products. Our long-term cooperation relationships with logistics companies also allow us to get more favorable freight. Of course, if you have your own freight forwarder, we can deliver the products to the designated location. ——————— 3. How about NOYAFA shipping services?NOYAFA renders professional shipping services. We have co-operated with reliable and experienced third-party-logistics companies to handle the shipping of our global business. And inside our company, we have established a mature shipment management system. Before the shipment, we carefully treat not only the printing of packing and shipping slips but also the various sizes of boxes or packages to avoid any shipping damage. More importantly, we always make sufficient communication with customers as to how their packages were shipped and when to expect it. ——————— 4. What are NOYAFA shipping modes?The mode of transportation is an important consideration when planning the shipment process. NOYAFA provides several shipping methods for customers by working with several international logistics companies. In the current market, there are mainly three kinds of transportation modes which are respectively air freight, ocean freight, and rail/road freight. You may choose any of the three different modes of transport depending on several factors such as budget, time, and types of goods being transported. Normally, shipping by sea has been practiced for thousands of years and remains pivotal to today's global trade. 90% of all international trade is accomplished through maritime transportation. However, if the order is urgent, you may choose air freight which may cost more.
Power Cable Fault Location Method
Power Cable Fault Location Method
Fault location method of power cable: Aiming at the problem that it is more difficult to determine the fault location of buried power cable than overhead line, this paper selects a representative example of fault location process of 10 kV cable in case of high resistance fault, and introduces the method of locating and locating the fault point by using secondary pulse method according to the fault nature. For the high resistance fault during cable operation, first consult the relevant data of the cable and master the detailed information of the cable; Use multimeter and insulation resistance meter to judge the cable fault type, and determine the corresponding test method according to the fault type; Use the fault tester to test the length of the cable, check whether the test results are consistent with the data, and preliminarily determine the distance of the fault point; Finally, the secondary pulse method is used to accurately locate the fault point, find out the fault point, peel off the cable and find out the cause of the cable fault, so as to take corresponding preventive measures. This method is easy to master, especially for short-distance faults, the test waveform is easier to analyze, and the fault distance can be determined quickly, which makes the cable test more efficient and the fixed-point positioning time shorter. Power cable faults are complex and diverse, which can be divided into open faults and closed faults according to fault surface phenomena; According to the grounding phenomenon, it is divided into grounding fault, phase to phase fault and mixed fault; According to the fault location, it is divided into joint fault and cable body fault; According to the nature of resistance, it is divided into broken line fault, mixed line fault and mixed fault. Among them, mixed line fault is divided into low resistance fault, high resistance fault and flashover fault. 1. Fault detection methods for different cable faults, the common detection methods include low voltage pulse method, pulse current method, secondary pulse method, bridge method, pulse voltage method, etc. [3]. This paper only introduces the three commonly used detection methods. 2. Low voltage pulse method low voltage pulse method is suitable for detecting low resistance fault (short circuit fault with fault resistance less than 200 & omega;) and open circuit fault. It can also be used to measure the length of cable and the propagation speed of electromagnetic wave in cable, and distinguish the middle head, T-joint and terminal head of cable. 3. Pulse current method pulse current method generally includes impulse flash method and direct flash method. The linear current coupler is used to collect the current traveling wave signal in the cable and generate the fault test waveform, so as to judge the fault condition and measure the distance between fault points through the waveform. The direct flash method is used to detect flashover breakdown faults, that is, the resistance at the fault point is very high, and flashover breakdown faults will occur when the voltage is raised to a certain value with high-voltage test equipment. The impulse flashover method is also suitable for testing most flashover faults. Because the waveform of the direct flashover method is relatively simple and it is easy to obtain more accurate results, the direct flashover method should be used as much as possible. 4. Secondary pulse method with the cooperation of high voltage signal generator and secondary pulse signal coupler, the secondary pulse method can be used to measure the fault distance of high resistance and flashover faults. The waveform measured by this method is simpler and easy to identify.
Introduction to Technical Indexes and Characteristics of Cable Identification Instrument
Introduction to Technical Indexes and Characteristics of Cable Identification Instrument
Today, we will give you the technical indicators and technical characteristics of popular science cable recognizer. Friends interested in this aspect can refer to this article. Come with Xiaobian. It is a common technical problem for power cable engineers and cable workers to accurately identify one of the target cables from a bundle of cables. This sometimes requires not only professional cable identification equipment, but also rich experience of staff. The purpose of the cable identification instrument is to avoid serious accidents caused by sawing live cables by mistake. The cable identification requires professionals to ensure that the double number of cable equipment is accurate from both ends of the cable. No matter how reliable the memory of on-site staff is, it can not replace the identification of professional instruments. Cable identification instrument is a special instrument developed according to the special needs of cable application. It is used to identify the power cut cables from a bundle of cables in cable management, erection, migration, maintenance and fault treatment. For the cable maintenance industry, the cable identification instrument is a very familiar instrument. It is indispensable to use this product in the installation and maintenance of power cables. The main reason is that it can help us provide accurate measurement data. The cable identification instrument consists of a signal generator, a receiving identification clamp and an indicator. When using the receiving identification clamp signal detector, 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 by the electric meter. Let's take a look at its main technical indicators. 1. Detection route and farthest fault location distance: 3km for cables with diameter less than 0.5, and 20km for other cables. 2. Fault insulation resistance at accurate point: 0-50m & omega;. 3. Positioning test accuracy: 10cm. 4. Detection cable depth: 3M technical features: 1. The transmitter and receiver of the complete cable identification instrument are powered by battery, which completely gets rid of the dependence on 220V mains power and is more conducive to field work. 2. The cable identification receiving coupling clamp adopts flexible clamp, which is more conducive to the occasions with dense cables and heavy cables. 3. Large screen color LCD display and voice prompt are adopted on the display interface, which improves the efficiency in cable recognition and is simple and easy to operate.
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