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2021-10-25
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In SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED, ethernet lan tester is recognized as an iconic product. This product is designed by our professionals. They closely follow the trend of the times and keep improving themselves. Thanks to that, the product designed by those professionals has a unique look that will never go out of style. Its raw materials are all from the leading suppliers in the market, endowing it with the performance of stability and long service life.NOYAFA products have been winning increasing trust and support from customers which can be seen from the growing global sales of each year. The inquiries and orders of these products are still increasing without a sign of declining. The products perfectly serve customers' needs, resulting in good user experience and high customer satisfaction, which can encourage customers' repeat purchases.We have a service team consisting of seasoned professionals for quality service. They have multiple years of experience and go through vigorous training on effective communication. Together with the Best Cable Tester Supplier in China _ Noyafa platform, this kind of service team can ensure we deliver the right products and bring tangible results.
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Negative Sequence Current and Negative Sequence Voltage Components Appear in Cable Fault Tester
Negative Sequence Current and Negative Sequence Voltage Components Appear in Cable Fault Tester
Relays used in the circuits of relay protection devices and electrical automatic devices are generally made of electromagnetic, inductive, electrodynamic and magnetoelectric principles. In recent years, there have been magnetoelectric devices using rectified current, magnetic relays with saturated inductance coils and electronic relays, and relays using semiconductors are being studied. The purpose of studying and adopting these new principles of relays is to simplify the structure of relays, improve their reliability and improve their parameters. Use indirect methods to indicate that there is a fault or improper working state in the power system. For example, this kind of relay has the ability to react with the generation of gas, the generation of heat, the increase of pressure, etc. The relay protection device must have the function of correctly distinguishing whether the protected element is in normal operation state or has a fault, whether it is a fault in the protection area or a fault outside the protection area. In order to realize this function, the protection device needs to be composed based on the characteristics of changes in electrical physical quantities before and after power system failure. The three-phase / six phase relay protection tester is developed by using Zui new digital technology, high-precision electronic devices, microcomputer system and new structure of line and cable fault tester. It can independently complete the device test in professional fields such as microcomputer protection, relay protection, excitation, measurement, cable fault tester and fault recording. It is widely used in scientific research, production and electrical test sites in electric power, petrochemical, metallurgy, railway, aviation, military and other industries. After power system failure, the main characteristics of power frequency electrical quantity change are: (1) current increase. In case of short circuit, the current on the electrical equipment and transmission line between the fault point and the power supply will increase from the load current to greatly exceed the load current. (2) Voltage drop. In case of phase to phase short circuit and grounding short circuit faults, the phase to phase voltage or phase voltage value of each point of the system decreases, and the closer to the short circuit point, the lower the voltage. (3) The phase angle between current and voltage changes. During normal operation, the phase angle between current and voltage is the power factor angle of load, generally about 20. In case of three-phase short circuit, the phase angle between current and voltage of cable fault tester is determined by the impedance angle of the line, generally 60 85. In case of three-phase short circuit in the opposite direction of protection, the phase angle between current and voltage is 180 (60 85). (4) The measured impedance changes. Measuring impedance is the ratio of voltage and current at the measuring point (protection installation). During normal operation, the measured impedance is load impedance; In case of metal short circuit, the measured impedance changes to line impedance. After fault, the measured impedance decreases significantly and the impedance angle increases. Negative sequence current and negative sequence voltage components appear; In case of single-phase grounding, negative sequence and zero sequence current and voltage components appear. These components do not appear during normal operation. The relay protection of various principles can be formed by using the change of electrical quantity during short-circuit fault.
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.
Best Wire Tracker for Finding the Hidden Data on Your Website
Best Wire Tracker for Finding the Hidden Data on Your Website
The introduction of wire trackerThis article is about a new service that provides you tools to understand your audience and the things that they are interested in. This will help you in creating better content for them.Tips for wire trackerThe role of wire tracker in a digital agency is changing from an analyst to a full-time employee.How to use wire tracker?There is a certain amount of power that is still in the hands of the content creators, and this can be obtained through different tools. However, it comes at a cost.The specifications of wire trackerWe want to talk about the topic of tracking.The best way to improve the productivity of a team is to enable them to focus on their core competencies. Even when there are other aspects that can be done at a higher level, it's most important for people from different functions within an organization to collaborate in order for it to work well.This is what makes the 'wire tracker' one of the most popular tools among managers and leaders, who are seeking ways to keep teams together and work together without distractions. It's built according to a high-level architecture, making it easy for any team member or administrator from different departments or divisions within an organization, who has some knowledge in software development or IT infrastructure operations, to implement its features using their own skillset. And it's made withThe product instructions of wire trackerProduct instructions should be written for all of the products that a company sells. The instructions should be clearly written so that customers can understand what they need to do to use the product. They should also be easy to follow as the instructions are meant for various types of users and not just the high paid professionals like salespeople.The application of wire trackerIdentity theft and fraud is one of the biggest threat for online businesses. Therefore, they are trying to use more and more sophisticated methods to protect their customers.
Cable Fault Detection and Search Method
Cable Fault Detection and Search Method
For direct short circuit or broken cable fault, the multimeter can be used for direct measurement and judgment; For indirect short-circuit cable fault and grounding cable fault, use a megger to telemeter the insulation resistance between core wires or the insulation resistance between core wires and ground, and judge the cable fault type according to its resistance value. The following describes the method of cable fault finding: zero potential method. Zero potential method is also known as potential comparison method. It is suitable for short cable core to ground fault. This method is simple and accurate, and does not need precision instruments and complex calculation. The measurement principle is as follows: connect the cable fault core wire in parallel with the comparison wire of the same length. When applying voltage ve at both ends of B and C, it is equivalent to connecting the power supply at both ends of two parallel uniform resistance wires. At this time, the potential difference between any point on one resistance wire and the corresponding point on the other resistance wire must be zero. On the contrary, the two points with zero potential difference must be the corresponding points. Because the negative pole of the micro voltmeter is grounded and equipotential with the cable fault point, when the positive pole of the micro voltmeter moves to the point when the indicated value is zero on the comparison wire, it is equipotential with the cable fault point, that is, the corresponding point of the cable fault point. S refers to single-phase knife switch, e refers to 6e battery or 4 No. 1 dry batteries, and G refers to DC microvolt meter. The measurement steps are as follows: 1) connect battery E on phase B and C core lines, and then lay a comparison conductor s with the same length as the fault cable on the ground. The conductor shall be bare copper wire or bare aluminum wire, with equal cross section and no intermediate joint. 2) The negative pole of the micro voltmeter shall be grounded, and the positive pole shall be connected with a long flexible conductor. The other end of the conductor shall be fully contacted when sliding on the laid comparison conductor. 3) Close the knife switch s, slide the end of the flexible conductor on the comparison conductor, and the position when the microvolt meter indicates zero is the position of the cable fault point. High voltage bridge method high voltage bridge method is to measure the DC resistance of cable core with double arm bridge, then accurately measure the actual length of cable, and calculate the cable fault point according to the positive proportional relationship between cable length and resistance. For direct short circuit between cable cores or short circuit point, the contact resistance is less than 1 & omega; The judgment error is generally not greater than 3m, and the contact resistance at the fault point is greater than 1 & omega; The resistance can be reduced to 1 & Omega by increasing the voltage and burning through; Next, measure according to this method. When measuring the circuit, first measure the resistance R1 between core wires a and B, R1 = 2RX R, where Rx is the phase resistance value from phase a or phase B to the cable fault point, which is only the contact resistance of the short contact. Then move the bridge to the other end of the cable and measure the DC resistance R2 between A1 and B1 core wires, then R2 = 2R (l-x) r, and R (l-x) is the phase resistance from A1 phase or B1 phase core wire to the cable fault point. After measuring R1 and R2, short circuit B1 and C1 according to the circuit shown in Figure 3, and measure the DC resistance value between B and C core wires, then 1 / 2 of the organization is the resistance value of each phase core wire, expressed by RL, RL = RX R (l-x), from which the contact resistance value of the fault point can be obtained: r = R1, r2-2rl table. Therefore, the resistance value of the core wires on both sides of the fault point can be expressed by the following formula: RX = (r1-r) / 2, R (l-x) = (r2-r) /2. After the three values of Rx, R (l-x) and RL are determined, the distance X or (l-x) between the fault point and the cable end can be calculated according to the proportional formula: x = (Rx / RL) l, (l-x) = (R (L-2) At the end of the cable, measure the capacitance currents IA1, IB2 and IC3 of the core wire of each phase to check the capacitance ratio between the intact core wire and the broken core wire, and preliminarily judge the approximate point of the broken wire distance. According to the capacitance calculation formula C = I / (2 & PI; Fu), when the positive voltage U and frequency f do not change, C is directly proportional to I. because the frequency of power frequency voltage is f (frequency) Constant, as long as the applied voltage is kept constant during measurement, the ratio of capacitance to current is the ratio of capacitance. If the total length of the cable is l and the distance of the core wire breaking point is x, then IA / ic = L / x, x = (IC / IA) 50. In the process of measurement, as long as the voltage remains unchanged, the reading of ammeter is accurate and the total length of cable is measured accurately, the measurement error is relatively small. The so-called sound measurement method is to find out according to the discharge sound of faulty cable. This method is more effective for the flashover discharge of high-voltage cable core to insulating layer. The equipment used in this method is DC withstand voltage tester. TB is high-voltage test Transformer, C refers to high-voltage capacitor, ve refers to high-voltage rectifier silicon stack, R refers to current limiting resistance, Q refers to discharge ball gap, and l refers to cable core. When capacitor C is charged to a certain voltage value, the ball gap discharges to the cable fault core, and the cable core discharges to the insulating layer at the cable fault, producing a loud and loud spark discharge sound. For open laying cables, it can be found directly by hearing. If it is buried electricity For cable, first determine and mark the cable direction. When searching, put the pickup close to the ground and move slowly along the cable direction. When the sound of Zi and Zi discharge is the largest, this is the cable fault point. Pay attention to safety when using this method, and assign special personnel to monitor at the end of the test equipment and the end of the cable. The cable fault locator produced by our company can not only measure the sound, but also To detect the magnetic signal, the signal strength is displayed visually and synchronously, which can locate the cable fault point faster and more accurately.
Introduction of Power Cable Fault Tester
Introduction of Power Cable Fault Tester
Main features of power cable fault tester power cable fault tester is a special cable testing equipment used to test the open circuit, short circuit, grounding, low resistance, high resistance flashover and high resistance leakage faults of power cable, as well as the open circuit and short circuit faults of coaxial communication cable and local telephone cable. It can also test the cable path, buried depth, radio wave velocity, verify the cable length, and establish cable files for daily maintenance and management. Free on-site guidance, training and testing until the user is proficient and satisfied, and there are actual faults to be solved on site. The power cable fault tester is battery powered and truly portable; The test distance is greater than 40km. The host test error is less than 0.2m. The host adopts industrial embedded computer system and 12.1-inch large screen LCD touch screen. Automatically select the sampling frequency, * low is 6.25mhz, * high is 100MHz. Arbitrary dual wave comparison function, test waveform arbitrary storage, call, compression and expansion. The fault distance is automatically displayed, and the double cursor can move * * to 0.18m, which improves the test accuracy. Built in a variety of field waveforms and field physical wiring diagrams for reference and learning. Cable data management software can establish perfect cable file management information. High precision digital display fixed-point instrument, direct indication of the distance between the test end and the fault point, pioneered in China. It can support wireless network card and carry out technical communication with our company anytime and anywhere. The whole machine is guaranteed for three years, free training, free tracking service and free software upgrade. 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!
Why Mainstream Language Is so Opposed to Built on a Small Core of Orthogonal Features?
Why Mainstream Language Is so Opposed to Built on a Small Core of Orthogonal Features?
On website there are programming languages, statements about them and voting that associates languages with statements. In particular, there are statements: "This language is built on a small core of orthogonal features" "This is a mainstream language" Why they are so opposed to each other? Is being incoherent, history-encumbrant, ridden with extra special cases a must for being popular, "mainstream" programming language? Maybe is it similar reason as why beautiful and coherent artificial natural languages (like Esperanto) are not that popular? There are three reasons why you learn a natural language:As it happens, the languages you'd learn under point 3 are ususually not spoken in public or at home, and are not taught in school in place of French or Spanish. Therefore, they are all very niche.Oh wow, so A and B seem to have some correlation. Does A cause B? Or the other way round? Or are there other factors that I didn't consider?Your question seems to ask if a programming language can only become mainstream if it is not orthogonal. This is misleading. Languages change over time. Their standard library gets reworked. New syntax is added. Object orientation is made available. Lambda expressions start looking useful. But closures and objects can be implemented in terms of each other, so why would I need both? Why would I want generics or other type system additions? I clearly do not need themA language that does not evolve is probably dead.For some languages, practicality is of utmost importance. It doesn't matter if there are five or more screwdrivers in my toolbox, because not all screws are equal. An experienced user will pick the right one for the situation.Other languages strive to be more minimal and/or elegant. This can be useful for didactic purposes, or in research settings. Small languages are easier to port. They are often useful, but not always when you have to ship your application yesterday.A language that tries to be relevant tomorrow has to keep evolving, and include new concepts. For example, the C standard is slowly but constantly being reworked. Each release of Java is a step forward. C# is often ahead of the pack as far as mainstream languages go. A language like SML or Smalltalk has no serious ambitions to go mainstream.A language that already is widely used has to stay backwards compatible, or it will loose market share. Features that were there yesterday have to stay available even if a better alternative was introduced. In Java, type parameters are erased during compilation for back-compat. In PHP, the main namespace is riddled with dangerous and deprecated functions that can't be removed without breaking a good part of the internet. I would suggest that successful languages tend to become less orthogonal over time, not only that less orthogonal languages tend to become mainstream more easily. However, there is no clear causation because there are more factors to consider.If I look through the list of languages you linked to we see as orthogonal languages: Scheme and Lua had minimalism as a design goal, academic languages like Coq, Haskell, SML are less useful for day-to-day programming or difficult to learn, and some languages like Forth and APL are barely used any longer. The less orthogonal languages are all quite mainstream, or have a long history. Fortran and COBOL are ancient, but still have a strong niche. Languages like PHP and Shell grew beyond what they where intended to do. Some languages are explicitly pluralistic, e.g. Perl and its descendant Ruby. The C# language is in direct competition to Java and tries to score with better features. Some languages have a religious commitment to backcompat, e. g. C or Perl. OTHER ANSWER: Because reducing the feature set of a language requires a compromise. Taking a feature out of the language means either:the language no longer has that feature, so people who need/value that feature will not want to use that language (aside: this is the reason I've never tried golang. while I like some of their ideas I find exceptions too useful to abandon), orthe feature must be implemented as a library within the language. But it is hard to design a language such that a wide variety of useful features can be implemented without compromising on syntax, and syntax is critical in gaining market share (if it wasn't, we'd all be using LISP by now).LISP is a good case study: it is built on an extremely small set of basic primitives, and those primitives can be combined and recombined in very useful ways, such that just about any language feature you can think of can be (and probably has been) implemented in LISP somewhere. Unfortunately, in order to become flexible enough to achieve this, LISP has compromised on almost all syntactic niceities, leaving a language that (to put it bluntly) only hardcore hackers can stand using. I'm not suggesting that this is the only way to make a small core language do useful and interesting things, but certainly it is harder to do it without making such compromises. And given that language success is a hit-and-miss kind of thing, ruled by primarily by what developers are trying to do that their existing languages don't do nicely and a new language might do better, the size of the core doesn't really figure much in whether a language becomes popular. And because making a nice language with a small core is more difficult than sacrificing either of those features, fewer such languages are made, which makes it substantially less likely (due to the law of averages) that they will gain traction.
Global Torque Screwdriver Market Status by Types, Applications 2020- Industry Overview Covers Manufa
Global Torque Screwdriver Market Status by Types, Applications 2020- Industry Overview Covers Manufa
Latest Research on Torque Screwdriver Market report offers detailed profiles of the key players to bring out a clear view of the competitive landscape of the industry. The report provides precise market outlook in relation to CAGR, market size by value and volume, and market shares. The company share analysis included in this study helps players to improve their business tactics and compete well against leading market participants. Further, the report also takes into account the impact of the novel COVID-19 pandemic on the Torque Screwdriver market and offers a clear assessment of the projected market variations during the forecast period.Get a Sample Copy of the Report At Torque Screwdriver Market:The global Torque Screwdriver market was valued at million US$ in 2018 and will reach million US$ by the end of 2025, growing at a CAGR of during 20192025. This report focuses on Torque Screwdriver volume and value at global level, regional level and company level. From a global perspective, this report represents overall Torque Screwdriver market size by analyzing historical data and future prospect.Regionally, this report categorizes the production, apparent consumption, export and import of Torque Screwdriver in North America, Europe, China, Japan, Southeast Asia and India. For each manufacturer covered, this report analyzes their Torque Screwdriver manufacturing sites, capacity, production, ex-factory price, revenue and market share in global market.Global Manufacturers of Torque Screwdriver Market Report Are:CDI Torque ProductsKlein ToolsCapri ToolsWihaPowerbuiltDEWALTGeneral ToolsHiltiWeraTohnichiSchneider ElectricMountzMatatakitoyoGedore TorqueNorbarIngersoll RandKolverMac ToolsLindstrom Precision ToolsRequest For Covid-19 Impact Sample Screwdriver Market Segmentation by Types:Electric Torque ScrewdriverManual Torque ScrewdriverTorque Screwdriver Market Segmentation by Applications:AutomotiveEngineering & ConstructionMachinery ManufacturingShipping & AerospaceOtherIn this study, the years considered to estimate the market size of Torque Screwdriver Market:History Year: 20142018Base Year: 2018Estimated Year: 2019Forecast Year 2019 to 2025Torque Screwdriver Market Production by Regions:North America (the United States, Canada, and Mexico)Europe (Germany, France, UK, Russia, and Italy)Asia-Pacific (China, Japan, Korea, India, and Southeast Asia)South America (Brazil, Argentina, Colombia, etc. )The Middle East and Africa (Saudi Arabia, UAE, Egypt, Nigeria, and South Africa)The analyzed data on the Torque Screwdriver market help you put up a brand within the industry while competing with the giants. This report provides insights into a dynamic competitive environment. It also offers a progressive viewpoint on different factors driving or restricting the market growth. Inquire or Share Your Questions If Any Before the Purchasing This Report does this report deliver?Comprehensive analysis of the global as well as regional markets of the Torque Screwdriver market.Complete coverage of all the segments in the Torque Screwdriver market to analyze the trends, developments in the global market and forecast of market size up to 2025. Comprehensive analysis of the companies operating in the global Torque Screwdriver market. The company profile includes analysis of product portfolio, revenue, SWOT analysis and the latest developments of the company.The growth matrix presents an analysis of the product segments and geographies that market players should focus to invest, consolidate, expand and/or diversify. The study objectives of this report are:To analyze global Torque Screwdriver status, future forecast, growth opportunity, key market and key players.To present the Torque Screwdriver development in North America, Europe, China, Japan, Southeast Asia, India and Central & South America.To strategically profile the key players and comprehensively analyze their development plan and strategies. To define, describe and forecast the market by type, market and key regions.Purchase this Report (Price 3500 USD for a Single-User License) Screwdriver Market TOC Covers the Following Points:1 Study Coverage1. 1 Torque Screwdriver Product Introduction1.2 Key Market Segments in This Study1.3 Key Manufacturers Covered1.4 Market by Type1.5 Market by Application1.6 Study Objectives1.7 Years Considered2 Executive Summary2.1 Global Torque Screwdriver Production2.2 Torque Screwdriver Market Growth Rate (CAGR) 201920252.3 Analysis of Competitive Landscape2.4 Market Drivers, Trends and Issues3 Torque Screwdriver Market Size by Manufacturers3. 1 Torque Screwdriver Production by Manufacturers3.2 Torque Screwdriver Revenue by Manufacturers3.3 Torque Screwdriver Price by Manufacturers3. 4 Mergers & Acquisitions, Expansion Plans4 Torque Screwdriver Production by Regions4.1 Global Torque Screwdriver Production by Regions4.1.1 Global Torque Screwdriver Production Market Share by Regions4. 1. 2 Global Torque Screwdriver Revenue Market Share by Regions4.2 North America4.3 Europe4.4 China4.5 Japan4.6 India5 Torque Screwdriver Consumption by Regions5.1 Global Torque Screwdriver Consumption by Regions5. 1. 1 Global Torque Screwdriver Consumption by Regions5.1.2 Global Torque Screwdriver Consumption Market Share by Regions6 Market Size by Type6.1 Global Torque Screwdriver Breakdown Dada by Type6. 2 Global Torque Screwdriver Revenue by Type6.3 Torque Screwdriver Price by Type7 Market Size by Application7.1 Overview7.2 Global Torque Screwdriver Breakdown Dada by Application7. 2. 1 Global Torque Screwdriver Consumption by Application7.2.2 Global Torque Screwdriver Consumption Market Share by Application (20142019)Click Here for Detailed TOCContact Us:Name: Ajay MorePhone: US 14242530807/ UK 44 20 3239 8187Email: Our Other Reports:Personal Protective Equipment (COVID-19) Market 20202026 Industry Insights by Key Manufacturers, Global Countries Data, Major Drivers, Effecting Factors, Investment Scenario Forecast to 2026 | Industry Research. coWater-Based Anti-Corrosion Coatings Market 2020 | Global Boosting Technologies, Industry Growth Analysis, Demand Status, Industry trends and Forecast to 2025 Industry Research.coBulk Container Packagings Market by Global Technologies, Size & Share 2020 Top Countries Data by Regions, Market Driving Factors, Development Trends till 2025Video Laryngoscopes Market Size with Current Industry Scenario, Latest Opportunity, Top Key Players, Industry Share with Growth Analysis Forecast to 20202024 with COVID-19 AnalysisSmart Water Management Market Growth Dynamics 2020 Outlook by Global Size and Share | Segmentation Analysis and Impact of COVID-19 on Global Industry Forecast to 2026Pneumatic Bending Machine Market Size Expansion by Prominent Players, Industry Share, Global Industry Trends, and Forecast Analysis 20202026 | Report Includes COVID-19 Impact on IndustrySurgical Microscope Market Analysis, Business Size, Statistics, Global Growth Rate, Revenue, Strategies of Key Players Forecast to 20202026 | Industry Research.coVenous Catheter Market Forecast Report 20202026 Global Analysis by Competitive Landscape, Types, Applications, Industry Segmentation, and Worldwide Growth InsightsSericin Market 2020 Size, Global Industry Analysis by Business Plans, Import/ Export Value, Production Plans, Price and Revenue Forecast to 2025Short Radar System Market Size by Growth Status 2020 Global Key Players, Development Plans, Topmost Opportunities, Industry Trend and COVID-19 Impact on Geography Forecast till 2026Honeysuckle Granules Market Size Analysis Report 2020 to 2025 | Growing Status of Top Key Players, Industry Demand Status, Manufacturing Size & Process AnalysisFlea and Tick Carpet Powder Market Size, Global Growth Rate Forecast by Regions 2020 | Future Trends with Key Manufacturers, Development Status till 2024.
Instructions for Use of Cable Fault Tester
Instructions for Use of Cable Fault Tester
When using the cable fault tester, we should first look at some simple waveform diagrams to analyze different cable faults, and then find out the fault points through the corresponding methods. The following is our simple analysis and description. 1. Test the low resistance grounding, short circuit and open circuit faults of the cable with the low voltage pulse method. A. no other auxiliary equipment is needed at this time. A clip wire is directly connected to the input and output interface of the cable fault location host. Clamp the red clamp of the clamp wire on the faulty phase core wire of the faulty cable, and the Black clamp on the sheath ground wire of the cable. B. Start the power switch of the instrument, the screen saver picture will appear on the screen, and click to enter the interface automatically. At this time, the default state of the instrument is "low voltage pulse method". The use method shall be selected according to the type and length of the tested cable on site and the fault nature preliminarily judged. When it is set to "low voltage pulse method", wave velocity measurement can also be carried out on this interface, and historical files can be opened to view previous test results. C. After setting the equipment parameters, click the "sampling" button, and the instrument will automatically send out test pulses. This interface will display the (open circuit) full-length waveform of the cable (as shown in Figure 5) or the low resistance grounding (short circuit) fault waveform (as shown in Figure 6). If the waveform is not good, the operator shall adjust the "median" and "amplitude" and observe the collected echo until the operator thinks that the amplitude and position of the echo are suitable for analysis and positioning. Basic information such as instrument parameter setting is also displayed at the bottom of the screen. During operation, pay attention to the operation status at the bottom of the screen. D. Waveform positioning reading distance. It is easy to judge the distance of low-voltage pulse, as long as the cursor is positioned to the starting point of transmitted and reflected waves respectively. E. When "saving", the test results need to be retained or reserved for comparison. The "saving" function in the instrument should be used to save the measured waveform in the instrument database. If the tester thinks it is necessary to save the test results, he can click "save" and operate according to the prompt in the submenu. 2. The high resistance leakage fault (including high resistance flashover fault) of the cable is tested by the impact high voltage flashover method. The instrument can test the high resistance leakage fault of the cable by the impact high voltage flashover method. Impulse high voltage flashover method is a popular traditional detection method in China. Many users are used to this method. The external circuit is relatively simple, but the waveform analysis is more difficult. Only on the basis of a large number of tests and some experience can we master it skillfully, but it is still an effective test method. Connect the current sampler attached to the instrument with the host with the signal wire and place it next to the grounding wire between the cable and the high-voltage equipment. As long as the output voltage of the impulse high voltage generator is high enough, the fault point will be broken down under the impulse of this impulse high voltage, and the radio wave reflection will be generated in the cable. The current sampler transmits the induced reflected wave obtained from the current signal on the ground wire through magnetic coupling to the cable fault location host for a / D sampling and data processing, and displays the collected waveform on the screen for fault distance analysis. After the cable type and sampling frequency are determined, you can click the "sampling" button to wait for sampling. Once the high-voltage generator has impulse high-voltage flashover, the instrument will automatically carry out data acquisition and waveform display. The red waveform at the top of the screen is the waveform after local amplification, and the blue waveform at the bottom is the full picture of the test waveform. When the ideal waveform is collected, the "waveform scaling" and displacement and moving cursor can be operated to calibrate the fault distance. The operation method is consistent with the low-voltage pulse method. 3. Wave velocity measurement cables produced by different manufacturers, although the models are the same, the differences in process and medium formula will lead to the differences in radio wave propagation velocity. If the average wave propagation speed given by the instrument is directly used, it will cause a certain test error. In order to test the fault distance more accurately, it is often necessary to recheck (test) the radio wave propagation speed of the cable.
What Is a Cable Pricker
What Is a Cable Pricker
Cable stabbing device Preface: according to the relevant safety work regulations of the power industry, manual stabbing is unsafe and will cause personal injury in case of error. In order to solve this problem, we have made a cable identification instrument and safety stabbing device, which can identify and stab the cable when it is impossible to judge whether the cable is charged at the construction site. The high-voltage cable safety stabbing device is divided into single gun and double gun. The main difference is that one can stab at one angle or two angles, and adopts non-contact control (remote control and timing). The instrument and provides power supply. The battery can be isolated from the power system to ensure the safety of the power system. At the same time, people can also stand at a far position and stab completely through remote control. Disassembly of cable stabbing device: where the final removal work needs attention after each test is completed, each stabbing shall be completed once. The voltage level electroscope corresponding to the power supply cable shall be used to confirm that the bound cable and equipment are dead, and then the stabbing device can be removed or stabbed at another angle. A cable must be pricked in two to three directions. After that, remove the pricker and finally remove the grounding wire. After pricking, use the equipped through needle to push the piston rod in the barrel back into the bottom of the barrel, and wipe and maintain the device for reuse. Safety of cable stabbing device: 1. Electronic control ensures that even if the device power is turned on and the "confirm" key is pressed by mistake to enter the selected mode, it is necessary to conduct secondary confirmation or mode selection again; The device will not act automatically because it enters the timing mode by mistake. A second confirmation is required to enter the selected mode. 2. The electronic control ensures that even if the power supply of the device is turned on and a key of the remote controller is pressed by mistake, the device will not act. The device will not act until the C and D keys on the remote controller are pressed at the same time. 3. The electronic control ensures that the device will not operate until you press the C and D keys of the remote control at the same time after prompting to stay away from the site. 4. In the timing mode, the remote controller does not work, and there will be no misoperation caused by mispressing the remote controller. Through the above understanding.. I believe you have a more detailed understanding and understanding of what the cable pricker is. If you have any questions, please feel free to discuss it at any time.
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