Shop Best Custom Cable Tester in NOYAFA

Shop Best Custom Cable Tester in NOYAFA

2021-11-05
NOYAFA
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Custom cable tester from SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED represents the finest in design and craftsmanship. It is elaborately designed by a group of innovative experts who have years of experience in the industry and know well about the market changing demands. And it is delicately crafted by the skillful workers by using the well-selected materials and the modern advanced production equipment. The product has a long service life which delivers greater economic value to customers.The influence of NOYAFA branded products in the international market is growing. These products are manufactured in line with world-class specifications and are known for their superior quality. These products gain a high market share, capturing customers' eyes with superior performance, long service life and reasonable price. Its constant innovation, improvement and potentially broad application prospects have won the reputation in the industry.The ability and willingness to provide customers with small quantities of Custom cable tester have been one of Best Cable Tester Supplier in China _ Noyafa's points of differentiation from our competitors for decades. Now learn more by exploring the selection below.
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How to Customize Cable Fault Tester
How to Customize Cable Fault Tester
Customization is now a very popular concept, and many enterprise products can be customized. In many people's minds, customized things will be more in line with their own requirements and more comfortable to use. Can the cable fault detector also be customized? Do you need to explain the requirements to the manufacturer during customization? Let's discuss these problems today. With the growth of China's economy, all walks of life in China have changed to varying degrees. Take the power detection equipment industry where Xiaobian is located. The enterprises manufacturing cable fault tester, transformer tester and relay protection tester are expanding and increasing. However, with the rise of made in China, customization has become an industry norm. What should be paid attention to in the customization of cable fault tester? First of all, we must understand the power, resistance and current data of the cable fault tester we need, because different electric forging fault testers will have different detection values. When we fully feel its convenience and accuracy in the detection process, we did not determine the power before customizing the cable fault tester The electric forging fault tester customized by yourself due to resistance can not be suitable for yourself at all, which will also bring great negative impact to yourself. Therefore, before customization, confirm the data with the staff of the cable fault tester manufacturer, so as to ensure that the cable fault tester you customized is suitable for your own product needs. When selecting the manufacturer of customized cable fault tester, it is also necessary to select a more powerful enterprise. Not all electric forging manufacturers can customize their own products. If they cannot be carefully screened during selection, they will bring great losses to themselves. When customizing the electric forging fault tester, we must understand the strength of various manufacturers, especially the comparison of its manufacturing process and customization process, which is very necessary and more conducive to making our own choice. It can customize an electric forging fault test which is very suitable for the actual needs of its own power grid department. According to their own use scenarios, specify and enlarge some data values, which are all customized data, as well as some personalized characteristics of customized cable fault tester. The simple is to extract some of the most needed data according to their own needs and combined with the test value range of the cable fault tester, so as to make it closer to their own needs.
Hybrid Circuit Fault Diagnosis Based on Current Test
Hybrid Circuit Fault Diagnosis Based on Current Test
Abstract: in the process of hybrid circuit fault diagnosis using wavelet neural network, the selection of test parameters is very important. A fault diagnosis method based on current test is studied. Through the static and dynamic current information of PSPICE analog circuit and the combination of wavelet neural network, this method proves the feasibility of this method in hybrid circuit fault diagnosis, and provides a new method to improve the fault diagnosis rate of hybrid circuit.Keywords: wavelet neural network; Hybrid circuit; Current test; fault diagnosis0 IntroductionWith the rapid development of electronic technology and the continuous improvement of manufacturing technology, the complexity of the circuit is increasing and the chip size is decreasing. More and more mixed signal circuits are integrated on the system level chip, not just digital circuits or analog circuits. Because of the different testing methods of two circuits, traditional testing can no longer meet the development needs. This brings hitherto unknown challenges to designers, users and maintainers of the instrument and equipment, and also makes the detection of mixed mode signal circuits more and more seriously. The hybrid circuit fault diagnosis based on current test proposed in this paper is proposed under this background.1. Theoretical knowledge of current testCurrent test is to detect and locate the circuit fault by measuring the power supply current and effectively extracting the circuit fault information. It includes static current test technology IDDQ and dynamic current test technology IDDT.When the circuit works normally, the quiescent current is very small, but the quiescent current of the defective circuit is very large. Therefore, when the quiescent current in the circuit is detected to be abnormal, it can be determined that the circuit has failed. This is also the principle of IDDQ test. However, some faults in CMOS circuits, such as open circuit fault, do not cause abnormal quiescent current. Therefore, it is necessary to introduce dynamic current test here. Based on this, this paper considers the combination of quiescent current and dynamic current test, rather than simple quiescent current test. IDDT is a short conduction current, that is, during the state transition of CMOS circuit, PMOS transistor and NMOS transistor are turned on at the same time, so that a conduction circuit is formed between power supply and ground, as shown in Figure 1. Since IDDT is the change of current in the process of dynamic conversion, the size of IDDQ does not affect its result. Therefore, it also avoids the influence of the increasing static leakage current of deep submicron circuits on the test. This paper studies the significance of the combination of the two in hybrid circuit fault diagnosis.2 wavelet neural network for hybrid circuit fault diagnosisWavelet neural network is a combination of wavelet analysis theory and artificial neural network ANN theory. At present, there are two ways to combine the two:(1) Loose combination. That is, wavelet analysis, as a preprocessing means of neural network, provides input eigenvectors for neural network.(2) Compact combination. Wavelet and neural network are fused directly, that is, wavelet function and scale function form neurons.This paper adopts the combination of loose wavelet and neural network. Firstly, the modeling and Simulation of normal circuit and fault circuit are carried out through PSpice, and the static current IDDQ and dynamic current IDDT parameters are extracted. The characteristics of the obtained current are extracted by wavelet analysis in MATLAB, and analyzed in combination with neural network. The steps are as follows:(1) Parameter extraction. The current information of normal circuit and various fault circuits with bridge fault, open circuit fault and so on are extracted in PSPICE.(2) Wavelet analysis. The current information obtained in (1) is decomposed by wavelet in MATLAB, the wavelet coefficients are extracted, and the RMS is further calculated.(3) Fault location. Wavelet analysis and BP neural network are combined to analyze and judge the positioning effect. The specific steps are shown in Figure 2.
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.
Do You Know How to Purchase Cable Fault Tester
Do You Know How to Purchase Cable Fault Tester
In today's society, electricity is one of the indispensable and important resources in people's life. Cables bear the responsibility of transporting electric energy. We all know that anything used for a long time may fail, and so does cables. Cable fault detector is a special equipment to solve cable fault. Xiaobian will show you how to purchase cable fault tester today. Electric power has been a necessary resource for people's daily life. The State Grid is all over the country. Due to the actual needs of cable production process fault resolution and customer site cable fault location, not only cable manufacturers buy cable fault detectors to solve all kinds of cable faults in the actual cable production process and customer use site. Power companies rely on cable fault tester to accurately and quickly solve cable fault points and quickly modify power (or communication) faults. Therefore, the configuration of cable fault tester is different according to different occasions and requirements. As a cable manufacturer, when purchasing the cable fault detector, it is purchased in complete sets of high and low voltage, and the equipment components are 6-10 pieces. In case of direct buried cable fault location at the customer's site, the handling and transportation of the whole set of equipment must be transported by a special cable fault detection vehicle, otherwise the transportation quality of the instrument is not guaranteed. There are also some special cable fault detectors, such as the railway household coat cable fault detector. More specifically, it can be called the railway single core cable outer sheath fault tester. These two configured cable fault testers are suitable for railway. According to the characteristics of railway cable outer sheath fault, under the condition of separation of cable sheath and shielding layer, The bridge method or voltage drop method is used to initially measure the grounding fault of the cable outer sheath, and then cooperate with the special receiver to accurately find the fault point. At present, the cable fault detector sold on the market is mainly divided into two types: 1. It is a cable fault detector designed according to the principle of echo method: the components mainly include intelligent waveform detection analyzer, Pathfinder, DC high-voltage generator (including console and AC / DC high-voltage test transformer), capacitance, ball gap, pointing instrument, etc. 2. It is a cable fault detector designed and manufactured according to the principle of bridge method: the components mainly include fault location bridge (high and low voltage bridge), pointing instrument, path instrument, wave reflection fault location instrument, etc. The above two kinds of cable fault detectors include coarse side positioning part and accurate fixed point part of cable fault. Intelligent cable fault tester will be a new demand. The above is the purchasing knowledge of cable fault tester. I hope it can help those in need.
Best Cable Tester& Viewer
Best Cable Tester& Viewer
There are a lot of cable testers available in the market today. Many of them are developed by biased software developers. The reason is that there is no need for software developers to test other significant hardware components of a system. That's why all these software testers are biased towards specific manufacturers and applications.A wide range of tools exist, however, some are better than others, depending on the criteria you may be looking for like durability, testing speed etc. We will not discuss advantages and disadvantages as they do not apply to this article but instead focus on what you should look for when choosing one over another.As we have seen with most products mentioned in this article, there are plenty of options available online today and each one has its own strengths and weaknesses so it is important to know which one you shouldI wrote about the best cable testers above.The cable tester is an important aspect of electric circuits. The main function of the cable tester is to check whether a certain cable has a fault or not.This section will introduce you with what the Cable Tester is and how it works today.In the past, the cable tester performed due diligence on a certain set of cables. She found out whether they were compatible with various equipment and what kind of performance was expected. Nowadays, the task is passed over to robotsA cable tester is one of the most important people in the cable industry. They provide quick insight into the quality of the cables that they receive from various vendors.A cable tester is an expert on cables. He/she knows the ins and outs of the cables and can tell if they are performing as expected."Cable tester" is a popular test for TV and cable connections. It measures the quality of the cable connection. The "cable test" is necessary for determining whether a set will be able to transmit TV signals without interruption, or will have to do it on an intermittent basis.Being able to test a product on real-world applications is crucial for the success of business. It ensures that the product is safe to use.Instead of buying a new product, you can simply test it on your own. You can hide its flaw and then report it when you are done with this trial run.A cable tester is a person who tests cables, such as telephone cables or power cables. They are the most critical people in the industry.The best cable testers currently available for purchase are:What’s the purpose of a cable tester? To identify which cables are in use and to report this information back to the manufacturer.The advantage of using a cable tester is that it can be automated by a computer. Once set up, it can test any type of cables from different manufacturers at high speeds. This saves a lot of time and effort for the company’s IT department, particularly if they are trying to process many orders at once.There are a whole lot of cable testers out there, but they need to be evaluated and compared. This article will try to help you evaluate the software and makes it possible for you to make informed decisions when choosing the best cable tester.To help you decide on the best cable for your project, we have gathered these tests to compare different cable brands and make sure that the cable you choose is a good fit for your project and the system."Cable tester" is a fundamental tool for cable installation and maintenance. It helps the installer check if the cable is properly installed or not.There are many types of software that can test cables for different purposes. In this article, I will discuss the best cable testers that you should consider to test your cables for different purposes and the best one to use.A cable tester can evaluate cable and wire connections between different components.The best cable testers can give accurate results for a wide range of cables and wires. They are expensive, but the results are reliable. By purchasing a tester, you can also get the latest technology for your office or house.
How to Test Your Cable/ Internet Connection: 3 Ways to Check That It's Working Or Not
How to Test Your Cable/ Internet Connection: 3 Ways to Check That It's Working Or Not
...Testing your cable/internet connection is very important, but there are three ways to test it and each of them will take a little bit of time and patience. If you have your cable/internet connection working then it will be ready to use, but if you have a problem with your cable/internet connection, you should test it first. Once you have found the problem with your cable/internet connection, you can take the cable/internet connection to a technician or look for a replacement.There are lots of ways to check your internet connection and a couple of methods that we could use would be through WIFI testers, Wire cutters and If you use your phone for internet browsing you should check that it's not a virus. Even if you do not have access to a smartphone you should check that your internet connection is working.Is your Internet connection not working as it should? Or maybe you have a problem with your cable? If you have problems with your cable, a few simple steps can be followed to see if it is working properly.... To test your cable/internet connection, do the following.In the UK and USA we have so many devices and computers connected to the internet. Most of these devices have a data plan that will provide you with a broadband connection. Some of these devices will allow you to access other internet services, like video streaming. If you have an unlimited data plan then it is a good idea to check the connection you have to see if it is working or not.This article is a great place to start if you're a blogger who wants to find out how to test your internet connection or cable. Even if you are in a business that relies on a cable connection or internet connection it is a good idea to check your connection at least once a week. It is the same for a phone line, even if you have an internet connection it is important to check it too. There are several ways to check your connection, you could get a signal on your phone but it would not give you the full picture, so you could get your signal on your computer. There are many ways to check your connection.
How to Find and Analyze the Fault Point of Buried Cable Fault Tester
How to Find and Analyze the Fault Point of Buried Cable Fault Tester
On site, the cable to be tested is high-voltage cable, and all three phases are short circuited. Usage when using the cable fault, first separate both ends of the cable from the system, and then connect the red and black clips of the instrument host to ab respectively. The measured short circuit distance between the two phases is 312m, and the total length of the cable is 639m. The same results are obtained when connecting to any other two phases. We determine that all three phases are short circuited. If the user knows the direct buried path of the cable, we can find it within 312 meters, and then use the transmitter red clip in the Pathfinder to connect phase A and the black clip to ground, and use the low-frequency high-grade loop resistance of 580 Ω. Because the cable is buried deeply before and after 312 meters, the depth measured by the 80% method is 3 meters, the gain 66db signal is about 675, and the signal is very stable without obvious attenuation. After the cable path is clear, boost and discharge phase a with high voltage, increase the voltage to 8Kv, fully discharge, start at a fixed point from 180m, and finally find the fault point. After communicating with the customer, excavate the fault point with an excavator for more than an hour. Host function of buried cable fault tester 1. It can measure high and low resistance faults of all cables below 35KV, with wide adaptability; 2. With user-friendly software and full Chinese menu, the key definition is simple and clear, and the measurement method is simple and fast; 3. Excellent fault detection success rate, test accuracy and test convenience; 4. 8-inch color LCD touch screen as the display terminal, the instrument has strong data processing ability and friendly display interface; 5. Sampling high voltage protection measures are provided. The test instrument will not crash and damage in the impact high-pressure environment; 6. The built-in power supply can test the open circuit and low resistance short circuit faults of the cable in the environment without power supply.
Automatic Screwdriver Model Prototype
Automatic Screwdriver Model Prototype
This last week, I took on the challenge of designing and creating a low-fidelity model prototype of an automatic screwdriver with several features, such as an automatic screwdriver head selection mechanism and a screen which keeps track of how many screws have been screwed/unscrewed. The main goal was to make a tool designed like OXO, which is known for applying universal design principles to make well-designed and easy to use tools for cooking.PlanningTo start, I did a quick competitive analysis on other automatic screwdrivers to see what common design elements were used across this tool. Some were very simple and looked very similar to a normal screwdriver, but with a button to automatically unscrew/screw. Others were more advanced, having systems to change the overall shape of the screwdriver between a normal and a drill like shape or being turned on using a gyroscopic mechanism to tell which way you are turning the screwdriver. I really clung to the idea of being able to easily change between a traditional and drill shape, because that would make it a lot easier to use in several different positions and orientations. After deciding on my main design form, I wrote up a list of requirements that I wanted my design to be able to do. The main goal I had was for it to work and feel the exact same no matter shape it is in. To do this, I decided that the buttons, switches, and screens would work the exact same between the two different shapes. The most novel design choice that made this possible was to have 2 different screens: one on the end of the screwdriver that would be active when the screwdriver is in its normal shape and one in the middle of the screwdriver that becomes viewable when the screwdriver is in its drill shape. This way, the screen is easily viewable in both shapes, so the experience of using its features does not change between the two shapes. Though this may not be an especially cost-effective solution, it does make the screwdriver much more usable and adjustable. After deciding on my main requirements and design choices, I started to draw some quick sketches of how I wanted the screwdriver to look like. I also drew out what the different screens and touchable elements would look like.Initial PrototypeAfter drawing out my main ideas, I attempted to make my first prototype out of materials I had in my house, which only consisted of a few toilet paper rolls and a paper clip. I attached two toilet paper rolls with a paper clip, which I form to feel like a trigger, which would control the variable speed control. I also drew on buttons to act as a switch between screwing and unscrewing. I tried to use stick notes to imitate the screen, but they did not easily fit onto the ends of the toilet paper rolls. I tested this prototype in its different shapes and on different wall positions/orientations to confirm that the main actions (viewing the screen area, pressing the trigger, and switching the screwing direction) were easy to do while using it. I also made sure that these actions could be done easily whether the user was right or left handed.Second IterationOnce I confirmed the model and form was easy to handle and use in different positions, I reiterated on my prototype using stronger and more diverse building materials, like cardboard, tape, velcro, etc. In this iteration, I decided on the size of the model and the main types of buttons. The screwdriver is fairly large, but definitely still felt easy to grip, use, and easily access all the buttons/functionality. I felt like it would be large when actually created so that the top half could hold several different screwdriver heads and so that the screen would not be too small to see/interact with. I filled the empty middle parts of the model with pinecones to imitate the added weight and ability to tightly grip the model. I decided on a pressure-sensitive button for speed control instead of a trigger because it made the model easier to grip in different positions. I imitated this using a piece of paper that was scrunched to feel more like a spring. I made a switch using tape, paper, and a paper clip so that the user can easily switch between screwing and unscrewing during use. I made a hinge so that the model could easily switch between the two shapes, but it was slightly weak and did not hold its shape very well. I tried using magnets to have it hold its regular shape better, though they were not strong enough. I chose to do a final iteration of this design to fix this issue and to make it look cleaner overall.Final IterationMy final iteration cleaned up all the details from the second iteration and also created the main screens. In this iteration, I added colors to make it cleaner and signify the physical parts of the screwdriver you can interact with. I added velcro to the middle of the screwdriver so that the middle could easily change shapes and hold its form. I also added it to the bottom the bottom so that the model could easily fit into a new rechargeable stand I made for it. The velcro also had the added effect of making it easy to place and replace the paper screens I made to imitate the digital displays of the screwdriver. The digital displays would always be displayed on the screwdriver no matter what mode it was in. The digital display had two major functionalities: to allow the user to automatically change the screw head and to show the user the how many screws they have screwed/unscrewed. The head selection screen allowed the user to tap or swipe between different screw heads and different sizes for the screw heads. The screw counter screen allowed the user to see how many screws they had screwed/unscrewed, and reset each count individually on a button tap. The buttons at the bottom of each screen allow the user to easily switch between the two screens.User Test and CritiquesAfter completing my final iteration, I had a friend test out my prototype. First, I gave him the prototype and let him explore it and try and figure out what each major part of the screwdriver did. Then I gave him a fake task of trying to fix an amplifier using the model, with the added difficulty of starting out with the wrong screw head and size. He seemed to understand how to do the task and how to utilize my prototype to do so. This user test is available here. I also showcased my work to my class for feedback and critiques. For the most part, people thought my prototype was easy to use and enjoyed the novelty of it having two digital displays. Most people really liked that it was designed to be used in the same way for both different shapes. The only real critique I got was that one person could not easily grip the bottom. For a final product, I would make the bottom half get skinnier towards the middle while remaining larger at the ends. This way, it would be easier to grip while keeping the space at the ends necessary for the screens. Overall, I really enjoyed this exercise and the ability to iterate multiple times on my ideas. Using cardboard and other low-fidelity materials was really fun, but after seeing the creative ways my classmates utilized these materials, I think I could one day re-iterate on this project and make it look/feel even better
What Are the High Voltage Test Transformers_ Use of High Voltage Test Transformer
What Are the High Voltage Test Transformers_ Use of High Voltage Test Transformer
What is a high voltage test transformerHigh voltage tester refers to a kind of transformer that generates high voltage for high voltage test. High voltage test transformer has the characteristics of high voltage, small capacity, short continuous working time, thick insulation layer and usually one end of high voltage winding is grounded.High voltage test transformer is called test transformer for short. The test transformer is generally a step-up transformer. The test transformer uses the power frequency high voltage induced by the secondary side to test the insulation performance of various electrical products and insulating materials. Test transformer is an indispensable electrical equipment for withstand voltage test in the repair of motor, transformer and electrical products. The test transformer is mainly used for power frequency withstand voltage test of electrical products, partial discharge measurement, thermal stability test of insulating medium, etc; For medium and high frequency electrical equipment, special frequency test transformers can also be used for withstand voltage test and measurement of relevant electrical parameters.The primary and secondary windings of the test transformer have a large voltage ratio. The primary voltage is 0.4kV, 3KV, 6kV and 10kV. The secondary voltage can be made into 100 2000kv or higher, and the capacity can be 3 9000kva. For the field test of power equipment, the light test transformer is generally used; 50kV step-up test transformer is used for withstand voltage test of 6kV, 10kV transformers and other power equipment; For the withstand voltage test of high voltage, ultra-high voltage transformers and other power equipment with voltage level above 35kV, ultra-high voltage test transformers greater than 5 times the primary rated voltage of the tested equipment, such as step-up test transformers of 500kV, 700kv, 800kV and certain capacity level.Characteristics of high voltage test transformer1) High voltage: the primary voltage of the test transformer is 220V or 380V, but the secondary voltage of a single test transformer often reaches thousands to tens of thousands of volts. The test transformer with secondary voltage exceeding 750kV usually adopts multiple cascade structures.2) Small current: the rated current of the test transformer is actually the capacitive current of the tested object, so it is generally less than 1a. However, the secondary current of the test transformer used for cable and large motor test, external insulation pollution test, line corona test and other projects can reach several amps.3) Short working time: due to the short withstand voltage time of the tested product, the test transformer is generally 0.5h or 1H short-time working system except for external insulation pollution test, line corona test and cable test.4) The test transformers are generally single-phase and indoor devices (some are also made into outdoor devices): they are oil immersed self cooling structure, the winding insulation layer is thick, and one end of the high-voltage winding is usually grounded.5) The insulation level of the head and end of the secondary winding of the test transformer is different: the head end is high potential, and the end is directly grounded or grounded through an ammeter.6) High requirements for design and manufacturing process: due to the high working voltage, the insulation structure has a decisive impact on the overall size of the test transformer. Vacuum drying is generally required for the body, and vacuum oil injection is required for above 100kV.Classification of high voltage test transformers1) In terms of structure, there are iron shell type and insulated shell type test transformers.2) In terms of power frequency, there are several frequency level test transformers such as power frequency, frequency doubling, intermediate frequency and high frequency.3) According to the voltage level, it can be divided into low voltage, high voltage and ultra-high voltage test transformers.4) According to the use form, it can be divided into light mobile type and fixed type; There are also single use and two or more cascade use test transformers.The test transformer is generally single-phase and indoor devices, which are oil immersed self cooling structure. Because of its high working voltage, its winding insulation layer is thick, and one end of the high-voltage winding is grounded.The specific structural types of the test transformer generally include single bushing type, double bushing type and insulating cylinder type.Technical requirements for high voltage test transformer①Output voltage waveform. The output voltage waveform of the test transformer shall be close to the sine wave as far as possible. In order to reduce the voltage waveform distortion caused by the harmonic voltage generated by the harmonic component of no-load current passing through the impedance of voltage regulator and transformer, the magnetic flux density should be selected in the straight line section of core magnetization curve; At the same time, voltage regulating equipment with small waveform distortion shall be selected, and filter device can be added if necessary.② Impedance voltage. The secondary current of the test transformer is generally capacitive current. When the secondary current flows through the impedance of the voltage regulator and the test transformer, the output voltage will exceed the value determined by the voltage ratio. Therefore, the impedance voltage of the test transformer should not be too large, otherwise it may affect the accuracy of the test results and reduce the short-circuit capacity of the test equipment. However, if the impedance voltage is too small, the short-circuit current may increase when the test object breaks down or flashover. The impedance voltage of a single test transformer is generally 4.5 10%, and when multiple series transformers are formed, it can reach 30 40%.What are the high voltage test transformers1) DJ oil immersed high voltage test transformerOil immersed test transformer: large volume, heavy weight, large capacity, convenient maintenance and high maintenance cost in the later stage; Mainstream products.The oil immersed type is filled with 25# transformer oil, and the insulation cooling effect is the best2) GTB dry type high voltage test transformerDry type test transformer: maintenance free, light weight, small volume, inverted and high cost.3) Inflatable high voltage test transformerInflatable test transformer: it needs later maintenance, with good arc extinguishing performance, light weight and danger.The oil immersed type is filled with 25# transformer oil, and the insulation cooling effect is the best; Dry type has small volume and lightest weight, but the voltage is difficult to be high; The inflatable type is filled with SF6 gas.Application and operation method of AC / DC high voltage test transformerDuring the step-up or withstand voltage test of AC / DC high-voltage test transformer, if the following unusual conditions are found, the voltage shall be reduced immediately and the power supply shall be cut off. As of the experiment, the reasons have been found out: ①the pointer of the voltmeter swings greatly; ② The insulation of the invention burns or smokes; ③ There is unusual sound in the test object.Utilization and operation methods of AC / DC high voltage experimental transformer:1. Connect the power supply of the control box (console) and turn on the indicator light.2. Press the start button and the operation indicator light is on (otherwise, the voltage regulator is not in the zero position, please rotate the hand wheel of the voltage regulator to the zero position counterclockwise) indicating that the experimental operation can be stopped.3. Move the hand wheel of the voltage regulator clockwise to make the conditioning rate 2KV / s better, and watch the high-voltage meter rise to the required voltage value. For example, in the process of boosting, when the test object breaks down, short circuit and overcurrent occurs, the overcurrent relay acts to automatically cut off the power supply.4. If the experiment requests overcurrent control, adjust the overcurrent relay to the power supply current value required by the experiment in advance before operation, and the current relay will stop overcurrent protection according to the experiment request.5. While monitoring the high-voltage meter, an external 0.5-level voltmeter can be accepted at the instrument end for monitoring.6. Measure the insulation resistance and check the insulation condition before and after the withstand voltage test.
Model Prototype: OXO Handheld Screwdriver
Model Prototype: OXO Handheld Screwdriver
This project focused on creating a low-fi 3D prototype of a potential design for a OXO electric handheld screwdriver with the following specifications:variable speed control you decide the mechanism/interaction and whether it is fluid or distinct settingsscrew-driver selection mechanism (either digital or non-digital your choice) allows you to automatically select and switch between either Phillips or flathead shape and five different sizes of each shape (for 10 total screwhead choices)screw-driver direction selection mechanism (non-digital) to either screw in or unscrewdigital readout (monochromatic, non-touch sensitive) of number of screws screwed and screws unscrewed for tracking your progress as a handypersoncan be used right or left-handedproduct dimensions are a minimum of 6 inches long and must be able to contain a rechargeable batteryproduct weight is between 11.5 poundsFor each of the feature criteria above, I came up with an idea for how I would implement it onto the prototype:Trigger pressure or wheel to control speedDouble wheel selection to change between head type and sizeA switch to control screw and unscrew optionsA digital number display to show the digital readoutA charging port and the end of the handleHere are my sketch ideas for how the features would look on the device:After sketching the prototype, I thought I had a pretty good idea of the layout of the controls but there were some things I realized as I was conceptualizing the design. There were a lot of features to implement onto the screwdriver that would be difficult to fit onto a handheld device so as I was sketching, I tried to consider space as a constraint. Another thing I noticed was that there was a big difference in readability between putting numbers side-by-side and one top of the other.PrototypeTo build my prototype I used cardboard and tape. I made the prototype larger than the actual size it would be so that I could clearly display the features and test the interface functionality with a user. Here is what the prototype looks like:AnalysisTo test this prototype, I sat down with a participant and asked them to screw in and unscrew a screw at a specified setting while vocalizing their thought process. The user was able to complete the task but there were a few features that were unclear.Features that were unclear to the user:Used the Phillips instead of a flat head on the screwThought the unscrew/screw switch was to activate the screw driverSuggested moving the placement of the controlsThings that went well:User was satisfied with the easy controlsWas easily held and comfortable in their handsAble to complete the task without major issuesThe prototype worked well to complete specified tasks but it was a challenge trying to fit all the features onto a small device. Another challenge was how to test a trigger that would rely on users pressure. Without outright telling the user how the device is reacting to their actions, it can be difficult to simulate. I would improve the layout of the controls by minimizing their size and moving the size selection to the handle. I would also use text instead of symbols to show the different screw head types because it seemed to confuse users during testing RELATED QUESTION What are POP materials when it comes to advertising? Here are the most common POP signage. The Pop Up Counter These are used when a brand wants to give out product samples or do product demos. Image source: Portable Counters | Exhibition Tables | Fast TAT AUS Wide The Cardboard Display Stands Bunting Flags Bunting flags are not as common as before however a small number of brands still use this. Image source: Shelf Talkers Product Bins These are some of the most popular displays that brands use to promote their products in-store.
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