Shop Best Rj45 Tester in NOYAFA

Shop Best Rj45 Tester in NOYAFA

2021-10-20
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Cable Identifier Manufacturers Popularize Science on Information Security of Power System
Cable Identifier Manufacturers Popularize Science on Information Security of Power System
China's science and technology are developing continuously and its economy is growing steadily. In this environment, the development speed of China's power industry is not the same as before. However, in today's society, facing the increasing demand for power in people's production and life, the power industry can ensure people's power consumption only by doing a good job in safe production. Now let the cable recognizer manufacturer popularize some knowledge about power system information security. In recent years, with the rapid development of power grid, especially power grid dispatching automation system, power dispatching control business has become the lifeblood of power system. According to the security protection regulations of power grid, power plant computer monitoring system and dispatching data network, the power control system must be effectively and safely isolated from the office automation system. The above-mentioned isolation means that the dispatching data network used by the power control system must be physically isolated from the public information network and the Internet, and a national power system information security protection system, security responsibility system and security joint defense system must be gradually established. The goal of power grid information security is to prevent the power grid, power plant computer monitoring system and dispatching data network from being attacked, prevent power system accidents caused by attacks, ensure the safe, stable and economic operation of power system, and protect the safety of important national infrastructure. Therefore, building the security protection system of dispatching automation system has become an important task of power grid dispatching automation in the future. Power grid information security has become an important link in the production, operation and management of power enterprises. 1、 Security protection scheme of main station of network dispatching automation system security protection strategy of main station of network dispatching automation system. Security zoning, network dedicated, horizontal isolation and vertical authentication are the basic strategies for security protection of power secondary system. Its core idea is two isolation, namely, effective and safe isolation between control system and office automation system, and physical isolation between dispatching data network, public information network and Internet. 2、 The basic principle of security protection of power real-time data network system. In theory, although the power real-time data network system with absolute security and confidentiality can not be established, if some reasonable principles are followed at the beginning of construction, the corresponding security and confidentiality will be greatly improved. When designing the security mechanism of power data network, we should follow the following principles from the perspective of Engineering Technology: among them, the integrity principle of network information security system comprehensively considers the factors such as security protection, monitoring and emergency recovery. Because the security and confidentiality of network information can not be guaranteed, it is required that when the network is attacked and damaged, the service of the network information center must be restored as soon as possible to reduce losses. Therefore, the security protection mechanism, security monitoring mechanism and security recovery mechanism of information security system should be included. Principle 2: Barrel Principle of security and confidentiality; It is necessary to consider the balance and comprehensive security protection of network data and information. The cable identifier manufacturer believes that it is a necessary prerequisite for designing the information security system to fully, comprehensively and completely analyze, evaluate and detect the security vulnerabilities and security threats (including simulated attacks) of the system.
Structure of Mine Cable Fault Tester
Structure of Mine Cable Fault Tester
1. The mine cable fault tester is composed of control part (low voltage) and high voltage rectifier, discharge and test part. Sufficient safety space shall be reserved between high and low pressure room, high and low pressure room and shell. 2. In order to ensure the safety of equipment and personnel, special personnel must operate with keys before high-voltage startup. 3. During each flaw detection or cable test, it can ensure that the high voltage rises slowly from the zero position, with the shape of high and low voltage limit. The pressure rise or fall process is controlled by the button, the voltage rise and fall rate is stable, and the operation is safe and simple. 4. The DC withstand voltage test time can be automatically carried out after digital (or manually controlled), and the test time is accurate and reliable. 5. The leakage current can be measured at any time according to the needs of the withstand voltage test process. 6. The mine cable fault tester has over-current and short-circuit protection, startup warning and over-current protection. 7. The control panel is equipped with power switch, high-voltage start, high-voltage stop, step-up, step-down and other switches or buttons, voltage withstand test, digital time timing relay, etc. 8. There are high voltage, leakage current, low voltage total current and other measuring meters on the display board, power supply, high voltage, timing and other indicator lights, curve observation window for ball gap discharge, etc. 9. Special high voltage discharge * * is equipped for discharge after each flaw detection or test to ensure safety. There is a grounding mark at the bottom of the box. Dear customers: the company also has cable fault detector, buried cable fault detector and underground pipeline detector products. You can call the company's service phone through the web page to learn more product details. Perfect service is our pursuit. New and old customers are welcome to buy their favorite products at ease. We will serve you wholeheartedly!
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
Overview of Cable Fault Locator
Overview of Cable Fault Locator
Overview of cable fault locator cable fault locator is a 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, poor contact and so on. The cable fault locator is equipped with an acoustic pointing instrument, which can be used to accurately determine the * * position of the fault point. It is especially suitable for testing power cables and communication cables of various models and different levels of voltage. Detection mode the cable fault locator adopts a variety of detection modes and applies contemporary * advanced electronic technology achievements. 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. The design of locator to detect aircraft cable fault is very important in civil aviation maintenance; 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, power and other departments. Dear customers, the company also has cable recognizer, cable tie tester and underground pipeline detector products. You can call the company's service phone through the website to learn more about the details of the products, Perfect and beautiful service is our pursuit. Welcome new and old customers 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!
Do You Understand the Function of Cable Fault Tester
Do You Understand the Function of Cable Fault Tester
In the whole process of application of high-voltage wires and cables, if a common fault occurs, it will lead to the final disconnection of the power supply system. It is necessary to carry out inspection immediately and quickly find the common fault point. The cable fault tester must be used. In this paper, we will briefly introduce in detail the functions of the cable fault tester. System software composition of cable fault tester: the cable fault tester is composed of test host, relative path signal generator, relative path signal receiver and detector. The cable fault tester includes integrated computer, bottom pressure single pulse generation and data processing methods to detect the spacing of common faults, and can also be used to accurately measure the length of cable and the rapid propagation of electromagnetic wave in cable. The relative path signal generator generates intermittent sinusoidal waveform data signals with a frequency of 30kHz and a force of 30V to find the relative path of the cable. The relative path signal receiver is used to receive the relative path data signal to search the cable route and estimate the depth of cable laying. The detector is used to accurately locate common fault points. Technical characteristics of cable fault tester: 1. Fault test system software: it can detect various common faults of various wires and cables, as well as the common faults of lead and short circuit faults of coaxial output power cables and local call cables. It can measure the propagation rate of electromagnetic waves in all known cable wires. The detection distance shall not be less than 16km 2. Relative path signal generator: output data signal frequency 30kHz, oscillation method, intermittent 3. Detector: detection sensitivity: 50 & omega; The video signal of the internal resistance outputs a 300Hz data signal, and the designated instrument inputs the data signal no more than 10&mu under the condition that the output remains 2V and the signal-to-noise ratio is better than 20:1; v. Input impedance: not less than 1.2k & omega;. Fault test method: the fault test is generally divided into the following processes: first find out the basic situation of common fault cable: measure the grounding resistance of common fault cable with megger and multimeter, and accurately measure the total length of cable with bottom voltage single pulse, whether there is disconnection, short circuit fault, etc. Second, according to the details of common faults, determine the appropriate detection methods and accurately measure the cable fault spacing. Generally, people set the common disconnection faults and resistance measurements at 100 & omega; The following cable faults are called low resistance (pilot) common faults, which are detected by bottom voltage single pulse method, and other common faults are detected by impulse flash method or direct flash method. Third, detect the relative path and depth of cable laying around common fault points. Identify the exact location of common fault points. Disconnect all connections between the cable head end and the terminal equipment head before testing. The control panel of the detection system software is equipped with two buttons for inputting amplitude and offset, which are respectively used to adjust the left and right parts of the input data signal strength and wave pattern for the next sampling.
Cable Tracker, Cable Management Software for Residential Homeowners
Cable Tracker, Cable Management Software for Residential Homeowners
Cable Tracker Software is a free software that allows you to track and control your cable network.It allows you to monitor incoming and outgoing cable signals and send email alerts when a signal goes down or up. You can also use it to manage your cables remotely, do security checks on them, as well as get updates on their status.The automated cable tracker can save you time by identifying all the cables that go to your property or business and follow them to determine the source of the power.Cable Tracker Software is the most popular software for monitoring your cable TV service. With Cable Tracker you can quickly and easily view your subscription history, watch TV shows, get alerts when new episodes of your favorite shows are on demand, set reminders to watch a show or go back to some other channel.It is a piece of software that tracks all the TV& cable channels for subscribers and shows the complete list of all channels in a user's reach.Cable Tracker Software is an office product that allows users to manage all their cable connections and subscriptions.Cable Tracker Software is a professional software for TV/Cable network data analysis. It detects the end-user channel usage and compares it to the cable's own data. It can also provide a report on the advertising commission paid to each of these channels.This section is dedicated to the latest technology that has been adopted in the industry.Choosing the right cable company is one of the most important decisions you can make. If you're going to buy your cable service, make sure that the options are in line with what is best for your needs.Cable Tracker for Residential and Business provides a number of different options to choose from and filters them according to features, price and package. The idea is simple: if you can't decide which option will be best for your needs, Cable Tracker should help you by giving an overview of all possible alternatives.The cable tracker is one of the best-selling digital video recorder products in the market. The device allows users to record all kinds of properties, such as homes, offices and shopping centers. This device has several benefits:We should not think of these devices as an alternative to traditional video recorder solutions. Instead they are a complementary tool that provides more features to enable better recording and longer recording times for a fixed price.Cable Tracker is an innovative, multi-dimensional tool that enables cable companies to monitor and track all the homes and businesses in their networks. Once installed, it provides data on subscribers, company owned IP address and IP port numbers, cable companies’ technical data such as fiber optic cables and access points, IP address for each customer’s account manager (AMR), etc. Also keeps track of numerous other details such as current/past billing cycle dates, internet traffic measurements (download/upload speeds), weather app usage (solar panel usage), etc.Cable Tracker Software is a tool for tracking and monitoring the internet cable TV network usage.In this chapter, we will get acquainted with the term “Cable Tracker”. The purpose of this software is to be a complete solution for creating content for cable channels and digital video distribution systems.This software can generate content templates in order to save time when creating content for various types of cable channels or other digital video distribution systems. It also allows you to make changes to the template before submitting it to your client.The "Cable Tracker" is a list of cable providers' basic cable packages. It has been used by millions of people all over the world and has been a best-seller for many weeks.Cable Tracker is a service that helps you find cable TV, broadband and voice services at any time.This is a section that I thought would be useful for readers. It's the one thing that if you are a content writer you will never forget. It’s the most important thing to keep in mind while writing your articles.Cable Tracker is a real-time tracking and monitoring tool that enables users to monitor their cable TV subscriptions, VOD services and internet usage.Note: Cable Tracker is developed by Esri. Esri provides using built-in tools to manage residential and business customers' cable TV, internet, telephone etc. usage with a single interface in the cloud.Section: Media personals for children in the 21st centuryIntroduction: In this section we will discuss the different ways in which children are trying to find their way into the media industry. We will discuss how they are using social media platforms like Facebook and Twitter, and Snapchat as well as traditional ways of finding jobs like news agencies or newspapers online. We will see how technology has helped them in terms of searching jobs but also how it has helped
How to Use the Cable Identifier and How to Judge Whether the Cable Is Live
How to Use the Cable Identifier and How to Judge Whether the Cable Is Live
How does the cable identifier judge whether the cable is live? First: why should we judge that the cable is live: as an important instrument of power cable detection instrument, cable identification instrument has been used more and more widely. When there are multiple cables in the cable trench, it is necessary to identify a specific power-off cable, calibrate, move or cut off the cable, and other cables in the cable trench operate live, so the cable identification instrument shall be used for cable identification. Second: easy to use: compared with the cable fault tester, the use of the cable identification instrument is relatively simple. It is easier to use it by reading the instructions. Third: test example: since the cable shielding layer is usually connected to the ground, if other cables are also connected to the public ground in the cable bundle, the black output jack on the generator can be connected to the public ground, The return current is distributed in several cable shielding layers, and the return current is divided into many tributaries, which means that the difference current of the identified cable is large and the useful signal is clear. "Difference" means that the output current and its divided return current are in the same channel. As shown in Figure 4, there are 5 cables in Figure 4. Cable 4 needs to be identified. The "output current" of the cables to be identified is 20A. Assuming that the return current is evenly distributed among the shielding layers of all cables, there should be a return current of 4A in the cable to be measured. The difference in the cable to be identified is: 20A (output) - 4a (return) = 16A (difference). How to use the cable identification instrument I. working method of the cable identification instrument: the transmitter (host) is powered by 220V AC power supply, which is used for the power-off The cable to be identified, plus a fixed period, unipolar DC pulse signal. The output line of the transmitter is connected to the cable core and the grounding point or ground nail. The armor of the cable is disconnected from the earth, and the core is connected to the grounding point or ground nail at the far end. The loop can conduct pulse current, which can be read out by the meter on the receiver of the identifier. The current is determined by the loop resistance, and the loop resistance should be as small as possible. The wiring diagram of the identifier is shown in Figure 2. Note: during field use, if the grounding resistance is too small, the output current of the transmitter will also be large when the output adjustment knob is turned back to zero, and the protection circuit in the transmitter will act (shown as a small fast swing of the meter). At this time, the randomly configured 1 ohm 20W high-power resistor can be connected in series in the transmitter circuit. After the transmitter and receiver start working normally, the voltage induced in the sensor coil is displayed in the receiver header. The pointer swing direction of the header can display the current direction, that is, only the cable with current flowing out, the pointer deflects and swings greatly. This is the cable to be found. For all other cables, only the return current flows, the pointer deflects in the opposite direction and the swing is very small. The output adjustment knob on the receiver can adjust the signal strength. 2、 Wiring mode: 1. Before the test, cut off the tested cable, and the surrounding environment shall be in a safe state. 2. The generator is connected with the tested cable, and the red clip is connected with one or several cores of the identified cable. Connect the black clip to the ground nail. 3. Connect the core wire at the far end of the cable to the ground nail. 4. Disconnect the armor at both ends of the cable from the ground wire. 5. Plug the power cord into the power outlet. 3、 Identify the cable through the loop test. 1. In order to ensure the normal use of the instrument, pay attention to setting the test loop. 2. Connect the red output jack to the core of the cable to be identified, connect the black output jack to the ground, and connect the cable core to the ground at the far end. As shown in Figure 3, 3. The output current flows to the far end in the direction of the arrow in the cable, and all cores of the identified cable can be connected together through the earth return generator to obtain a clearer signal.
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.
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