What Is Ethernet Continuity Tester?

What Is Ethernet Continuity Tester?

2021-10-10
NOYAFA
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Characteristics of Power Cable Fault Tester
Characteristics of Power Cable Fault Tester
Power cable fault tester is a special cable detection equipment used to solve the test of open circuit, short circuit, grounding, low resistance, high resistance flashover and high resistance leakage faults of power cables, as well as the accurate test of open circuit and short circuit faults of coaxial communication cables and local telephone cables. 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. Power cable fault tester is a powerful cable fault comprehensive test system with high-speed data acquisition and superior data processing ability, which is born by absorbing the advantages of 20 cable fault testers at home and abroad. Based on the industrial embedded computer platform system, she adopts today's advanced network and digital communication technology, which greatly improves the use function and test accuracy of the instrument. The test system consists of test host, fault locator and cable Pathfinder. It is used to test the open circuit, short circuit, grounding, low resistance, high resistance flashover and high resistance leakage faults of power cables, as well as the accurate open circuit and short circuit faults of coaxial communication cables and local telephone cables. 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. For the cable high resistance fault test, our company launched the domestic light and small portable cable fault high voltage signal generator, which has the advantages of simple test wiring, safety and portability, and is pioneered in China. 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 cable fault tester, underground pipeline detector, 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!
In Case of These Six Cable Faults, It's Right to Choose It for Detection
In Case of These Six Cable Faults, It's Right to Choose It for Detection
With the characteristics of faster inspection speed and high precision of cable fault detector (also known as cable fault detector, cable fault locator and cable fault tester), it has won the favor of many customers. Many powerful enterprises will purchase a set of cable fault detector equipment to ensure the smooth operation of cables in the industrial zone. For equipment with these 6 kinds of cable faults, please choose this cost-effective cable fault tester. 1. Low resistance fault, cable insulation material is damaged and grounding fault occurs. 2. In case of open circuit fault, the continuity of the metal part of the cable is damaged, resulting in wire breakage, and the insulating material at the fault point is also damaged to varying degrees. 3. High resistance fault, cable insulation material is damaged and grounding fault occurs. 4. Flashover fault: the insulating material of the cable is damaged, resulting in flashover fault. 5. Breakdown fault: in actual work, the cable insulation damage event triggered by preventive test is commonly referred to as cable breakdown. 6. Operation fault refers to the cable fault determined by eliminating the possibility of faults of other power elements when voltage fluctuation occurs in the high-voltage secondary circuit of cable feeders, motor and transformer during the operation of plant power system or grounding signal is found (grounding tripping occurs in power elements with grounding protection).
Best Cable Tracker for DVR, Streaming, and Cable Boxes
Best Cable Tracker for DVR, Streaming, and Cable Boxes
Amped Cable Tracker is a tool used to measure cable data such as total length and channel count. It's a great piece of software which can help get better value for money out of your cable bill.As technology advances, so does the market for cable companies. The market is growing rapidly and Cable companies are now finding it harder to keep up with new technology and services offered by digital companies like Netflix, Hulu, Amazon Prime Video, etc.As more people are getting internet access through their standard TV set-top boxes and smart TVs there has also been an increase in online video streaming services offering TV shows and movies.A cable tracker is a software designed to help consumers track their favorite TV shows, movies, and sports. It does this by finding the best available cable channels available in your area to stream directly from your DVR or streaming device.In addition to cable channel availability, the software also searches for the most recent episodes of a given show or movie based on what you have watched recently. This tool uses information gathered from all over the internet including Reddit, IMDB ratings, and metadata stored in Netflix databases. In addition to choosing specific programs for viewing and comparing them directly with a user’s current moods and preferences; it also allows users to set up automatic reminders for future viewing sessions so that they can be more easily entertained on their vacations or when they are at work.Many cable companies are implementing new ways of tracking their customers’ activities. As a result, we can see that many cable companies have hired AI writers to generate content on a specific topic for them and also come up with ideas on how they can improve their service.Amped Cable Tracker is a cable tracker that records every channel that an individual watches. It does this by analyzing the time that a viewer spends watching different channels. Based on this data, the algorithm can predict which channel will be the most popular, based on their viewing habits and preferencesThe AI for cable tv is getting better day by day. We don’t need to wait for it to get perfect, we can just keep it as it is now. That way, we get ready-made content from where our eyes and ears are our best friends. We also know what people want and how they like to watch TV; so we can create interesting content based on these insights .Section topic: Content Marketing Automation with Salesforce (CMA)Introduction: CMA helpsThe Amped Cable Tracker provides detailed information on cable TV and satellite TV. It’s a tool to help users dial in the channels, watch programming and keep up with upcoming promotions and events.Cable TV is a highly competitive market and customer service is considered to be important. As a result, it's crucial to provide the best customer service possible. Amped Cable Tracker - the company's automated content generation tool, helps companies to generate content on different topics such as:Cable Tracker is a popular and convenient app to keep track of cable TV and internet packages in your house. It’s a free download from the app store.Section topic: Amped Cable TrackerIntroduction: This application allows you to easily keep track of cable TV and internet packages for your home."The cable company is always looking for new ways to improve service. They are constantly trying to figure out how to make it better and more convenient for their customers and they know that the best way of doing this is by analyzing how their customers use their service."To do this, they have installed a device called a Cable Tracker device in each of the thousands of homes that they serve. The tracker looks at the signal strength of each TV through its satellite dish and sends live data about how much signal is being received by each TV and what channels are being received by each TV."This data is sent over the Internet so that it can be analyzed by any computer with an Internet connection."Section topic: Firewall SoftwareIntroduction: "We like firewalls because they help us keep ourWe are living in a world where everything is connected and information flows across the internet. However, it’s not always easy to talk to people when you are thirsty for information.This is where cable tracker software can help. It allows people to send messages to different websites and applications at the same time, regardless of their location or devices.
This Paper Briefly Introduces the Fault Detection Method of High Voltage Cable
This Paper Briefly Introduces the Fault Detection Method of High Voltage Cable
The discovery and fixed-point work of cable faults has always been a big problem in the electrical measurement industry, mainly because most cables are deeply buried underground, the laying distance ranges from a few meters to a few kilometers, and the on-site environment is complex. In addition to the high quality requirements for cable fault test equipment, the comprehensive quality of technicians is also very strict. There are three common types of cable faults: low resistance fault, high resistance short circuit grounding fault and flashover fault. For different types of cable faults, the fault point detection methods are also very different. The following is a brief introduction to the fault detection method of high-voltage cable. There are two kinds of traditional fault detection methods for high voltage cables: bridge method and pulse method. 1、 Electric bridge method is a classical method for ranging power cables. This method is relatively simple, but it needs to know the data such as cable length in advance, and it is only suitable for low resistance and short circuit faults. However, in actual operation, faults are often high resistance and flashover faults. Due to the high fault resistance, the bridge current is very small, so it is difficult for general sensitivity instruments to detect. 2、 Pulse method 1. Pulse current method this method is safe, reliable and simple. The method is to break down the cable fault point with high voltage, collect and record the current traveling wave signal generated by the fault click through with the instrument, and calculate the fault distance according to the round trip time between the current traveling wave signal at the measuring end and the fault point. In this method, the pulse current is coupled with a transformer, and the waveform is simple and safe. This method also includes direct flash method and impulse flash method. Different from the pulse voltage method, which uses resistance and capacitor voltage dividers for voltage sampling, the pulse current method uses linear current couplers placed parallel to the low-voltage geodesic and has no direct electrical connection with the high-voltage circuit. It is particularly safe and convenient for recording instruments and operators. So people usually use this method. 2. Pulse voltage method this method can be used to measure high resistance and flashover faults. Firstly, the cable fault is broken down under the DC or pulse high voltage signal, and then the distance is measured by recording the time required for the discharge pulse to go back and forth between the measuring point and the fault point. An important advantage of pulse voltage method is that it does not have to burn through high resistance and flashover faults. It directly uses the instantaneous pulse signal generated by fault breakdown. The test speed is fast and the measurement process is simplified. 3. For low resistance and open circuit faults, the pulse echo method uses the low-voltage pulse reflection method to measure cable faults. Compared with the above bridge method, it is simple and direct. It only needs to observe the time difference between the reflection and transmission pulses at the fault point to locate the fault. During the test, a low-voltage pulse is injected into the cable. When the pulse propagates to the fault point, it will be reflected, and the pulse is reflected and sent back to the measuring point. The time difference between the transmitted and reflected pulses is recorded by the instrument, and the distance of the fault point can be calculated only by knowing the pulse propagation speed. This method is simple and intuitive. It does not need to know the original data such as cable length. It can also identify the position of cable joint and branch point according to the reflected waveform.
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.
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.
Common Power Cable Test Methods
Common Power Cable Test Methods
If the cable insulation is damaged or aging, short circuit, disconnection, grounding and other faults may occur in use, affecting the safe operation of the power system. Power cable plays an important role in power transmission and distribution system, so it is of great practical significance to detect power cable faults regularly or irregularly. Here is a popular science about common power cable test methods. AC withstand voltage test of main insulation (series resonance test equipment) is an effective method to test the ability of cable insulation to withstand various overvoltage. It is a strict, direct and effective test method to determine the insulation strength of cable. Cable fault location and cable path identification: the cable fault detector system is composed of cable fault detector, high voltage pulse generator, pointing instrument and cable comprehensive detector, which is used to detect cable low resistance, short circuit, open circuit fault, high resistance leakage and high resistance lightning fault, correct direction and depth of underground cable and locate open circuit, short circuit and skin fault points of cable. Partial discharge inspection: different from using ultrasonic detector products to detect common transformer partial discharge, vibration wave partial discharge detection is used for cable partial discharge. This detection method is based on LC damping vibration principle and uses attenuated vibration wave voltage with frequency in the range of 20-800hz instead of working frequency AC voltage detection equipment. It is mainly used to detect the main insulation For the insulation condition of the joint and terminal, its waveform and frequency are close to the sine wave of the working frequency, the action time is short, and will not cause damage to the cable. Infrared temperature measurement: the infrared thermal imager uses the infrared thermometer and optical image mirror to receive the infrared radiation energy distribution pattern of the temperature measurement target, which is reflected on the photosensitive part of the infrared thermometer to obtain the infrared thermal image map. The thermal image map corresponds to the thermal distribution field on the object surface, and the infrared thermal imager is used to detect the infrared radiation signal on the cable surface. The cable identifier manufacturer summarizes the common power cable detection classification. In practical application, power cable detection is closely related to insulator detection. Usually, various insulator fault detectors, insulator distributed voltage detectors and other products need to be used to detect various faults of insulators, especially in the annual spring detection of power companies, such as power cables, switchgear Transformers, overhead lines, insulators and various fittings shall be systematically tested to ensure the safe operation of the power system as a whole.
Wiring Methods of Cable Identification Instrument: Direct Method and Coupling Method
Wiring Methods of Cable Identification Instrument: Direct Method and Coupling Method
The wiring method of the instructions for use of the cable identifier is direct method and coupling method: the wiring method of the cable identifier is divided into two types: direct connection method and coupling method. The direct connection method is only applicable to the identification of uncharged cables, and the coupling method can accurately identify both live and uncharged cables. A) Direct connection method: the ground wire of the cable to be identified is disconnected, the signal current output line (red) is connected to any good phase, and the other end of the connected phase is grounded. The signal current return line (black) is grounded. Identification method: first judge the phase, subject to the initial swing of the meter pointer, and let the current flow along the direction indicated by the receiving clamp according to the direction shown in the figure. If it is a cable to be identified, the initial swing direction of the meter pointer should be to the right. In the process of phase judgment, if multiple cables are in the same phase, the amplitude can be compared. Adjust the sensitivity knob to the appropriate position to compare the amplitude. The cable with large amplitude is the cable to be identified. B) Coupling method: connect both ends of the cable to be identified with the earth (through core wire, shield or armor) to form a closed loop. When the direction of the output coupling clamp is consistent with that of the receiving coupling clamp, the cable with the positive deviation of the pointer direction of the meter is the cable to be identified. Identification method: under the condition that the output coupling clamp and the receiving coupling clamp are in the same direction, first judge the phase, subject to the initial swing of the meter pointer, and let the current flow along the direction indicated by the receiving clamp according to the direction shown in the figure. If it is a cable to be identified, the initial swing direction of the meter pointer should be to the right. During the phase judgment process of the cable identification instrument, if multiple cables are in the same phase, the amplitude can be compared. Adjust the sensitivity knob to the appropriate position to compare the amplitude. The cable to be identified has a large amplitude.
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