NOYAFA's Power Voltage Tester

NOYAFA's Power Voltage Tester

2021-10-05
NOYAFA
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power voltage tester helps SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED win a good reputation in the market. Regarding the product's production process, it is totally made by the state-of-the-art technology and completed by our professional technicians. One thing that should be emphasized that it has an attractive appearance. Supported by our strong design team, it is exquisitely designed. The other thing that should not be overlooked is it won't be released unless it withstands the strict quality test.NOYAFA products have made great achievements since its launch. It becomes the best seller for several years, which consolidates our brand name in the market gradually. Customers prefer to have a try of our products for its long-term service life and stable performance. In this way, the products experience a high volume of repeat customer business and receive positive comments. They become more influential with higher brand awareness.There is a variety of services tailored to customers' needs at Best Cable Tester Supplier in China _ Noyafa, such as product customization, sample, and shipment. power voltage tester and other suchlike products are supplied with short lead time and adjustable MOQ.
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Model Prototyping and OXO Electric Screwdriver
Model Prototyping and OXO Electric Screwdriver
This project is part of a UX Prototyping class that involves weekly prototyping challenge.ChallengeCreate a two model prototypes of an electric screw driver for OXO. First create a quick and rough cardboard model to visualize the placement of controls and functionality. The second prototype will be higher fidelity with a strong focus on ergonomics.The electric screw drivers must have the following variable speed control mechanism/interaction for changing between speeds screw-driver selection mechanism allows you to automatically select and switch between either Phillips or flathead shape and five different sizes of each shape. direction selection mechanism (non-digital) to either screw in or unscrew digital readout (monochromatic, non-touch sensitive) Displays number of screws screwed and screws unscrewed for tracking your progress as a handyman/handywoman. can be used right or left-handed product dimensions are a minimum of 6 inches long 2.5 inch x 2.5 inch battery with charge port attached product weight is between 11.5 poundsResearchBefore ideating, I researched the OXO company brand and their products. OXO is known for their signature non-slip and comfortable handles. They are advocates for universal and easy to use products for everyone.Looking closely at the product handles they have similar round rubber handles that are sized appropriately to the average grip. The paddle and plow handles in Figure 1 are good example of OXOs comfortable handles. The plow has curves that leverage a persons thrust. I took inspirations from these designs into the model prototypes handles. Design: 1st ModelThe priority of the screwdriver was the comfort of the grip, so I focused on the handle first and then designed the rest of the screw driver around it. I used a similar angled handle on the screw driver like the plow above. This angled handle fit the natural angle of the human hand. In this position users could comfortably hold the screw head level and apply weight without straining the wrist. Influenced by the OXOs ease of use I placed the majority of the functionality near the handle. I placed scroll wheels to change the speed and direction of the drill within comfortable reach of the thumb. The digital read out is also close the grip. I added a reset button for the read out right below the screen. Lastly, I used a screw-driver selection mechanism that can be changed by first pulling out the head of the screw driver and the twisting it to a different size and shape. Feedback: 1st ModelAfter completing the first model I received critique from two peers. I specifically asked for feedback on three criterions: comfort, ease of use, and ease of access to controls. The table below summarizes their feedback. This feedback guided redesigns for the second model.Design: 2nd ModelTo address the negative feedback I focused on fixing three things- Longer handle with added weight and better grip- Curved elbow between handle and base- Clear instructions for changing screw driver size and shapeBefore I drafted these changes, I visited the art store to look for materials that would give me freedom to form the grip well. I then drafted a redesigned screwdriver that addressed the feedback. I spent most of the time forming the foam that made up the grip and controls on the elbow. I then added clay to give the grip better shape and add weight to it. I used foam stickers and markings to emphasize buttons and functions of the screwdriver. ModelPrototype. mp4Edit descriptiondrive. google. comFeedback: 1st ModelAn in class critique session helped evaluate the usability and comfort of the screwdriver. I got good reviews from most of my class mates with suggestions on small design choices.IN/OUT for digital read out isnt as clear as Screwed/UnscrewedThe screw-driver selection mechanism is confusing. The large red arrow misleading because it is on the part of the screwdriver that doesnt moveThe prototype is balanced but too light to get a good sense of how it would be usedLessons LearnedI enjoyed the challenge making these two models out of random materials and learning a few lessons in process.Iterating and testing provides valuable feedback and a better product.Weight is important for testing how the real prototype would feelEveryone has different bodies so it is important to test ergonomics with many people. RELATED QUESTION Why are courier packaging bags so popular? Courier packaging bags also known as tamper proof courier bags or security bags are the packaging material of choice for a variety of reasons. A few of the most important reasons for their popularity is : Versatility - These bags work for almost every kind of industry, since they can be fabricated to any size required - big or small. Environment Proof - These bags are made of plastic and hence are protected from environmental factors such as dirt , moisture , dust, water etc. Easy to Use - All you have to do is place the item inside and close the bag, no advance machinery required :) Tamper proof features - These bags have mechanisms in built into the bag that help detect any kind of tampering or pilferage during transit. Easy to brand - These bags can be branded in low quantities and customised courier bags have become the staple for every eCommerce startup looking to scale quickly. Budget Friendly - Probable the biggest reason for their popularity. These bags are available for a very budget friendly price, that is a big lure for companies looking to improve their bottom line. I hope this quick list helps :)
Advantage Analysis of Cable Fault Tester
Advantage Analysis of Cable Fault Tester
With the development of the market, cable fault tester is mainly divided into common and three pulses. What are the advantages and functions of these two kinds? Yuange will explain them to you. [functional advantages of common cable fault tester] 1. It can measure high and low resistance faults of all cables below 35KV, with wide adaptability. 2. It has user-friendly software and full Chinese menu. Key definition is simple and clear. The measurement method is simple and fast. 3. Excellent fault detection success rate, test accuracy and test convenience. As the display terminal, the 4.8-inch color LCD touch screen 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. With computer communication interface, it is convenient to save data and graphics in the computer. 7. No test blind area. 8. 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. [functional advantages of triple pulse cable fault tester] 1. It can measure high and low resistance faults of all cables of 35kV and below, and has a wide range of adaptability. 2. The "three-stage pulse method" and "three-stage multiple pulse method" are adopted. At the same time, it also has the traditional high-voltage flashover method and low-voltage pulse method. 3. Any high resistance fault presents simple waveform characteristics similar to low voltage pulse short circuit fault, which is very easy to interpret. 4. It has user-friendly software and full Chinese menu. Key definition is simple and clear. The measurement method is simple and fast. 5. The central control unit is used for one key control to trigger three levels of signal output in sequence to ensure safety and success rate. The central control unit can prompt the operation steps and monitor the work process. 6. It has the function of test waveform storage, which can easily store the waveforms tested on site in the instrument according to the specified sequence for call and observation at any time. A large number of field test waveforms can be stored. 7. The measured fault point waveform and good phase full-length open circuit waveform can be displayed on the screen at the same time for the same screen comparison and superposition comparison, and the fault distance can be judged automatically. 8. 11 inch bright color touch LCD display, with strong data processing ability and friendly display interface. 9. Sampling high voltage protection measures are provided. 10. With 232 computer communication interface and USB communication interface, it is convenient to save data and graphics in the computer. 11. 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. [functional advantages of cable fault locator] 1. The data display part adopts a highlighted 4.3-inch OLED color LCD to make the display interface clearer. 2. The function and parameter adjustment part adopts a one key programmable pulse coding keyboard, which makes the operation panel more concise and the operation more convenient. 3. The instrument will collect and display the waveform of the audio part in real time. The distance of the fault point can be roughly observed by observing the repetitive waveform characteristics and distance axis, and the operator is not easy to be tired. 4. There are single and continuous modes in the acoustic magnetic fixed-point mode. If the discharge frequency is too fast and the gap time is too short, the user can select the single mode to carefully analyze the relevant data such as the primary discharge waveform, and the waveform page turning is supported in the single mode. 5. In the acoustic signal acquisition, four filter bands are adopted, including low frequency band, intermediate frequency band, high frequency band and full frequency band, which can be selected by the user according to the actual situation on site. 6. The step voltage part adopts waveform display to continuously sample and refresh the signal, so that the user can enhance the continuity analysis of the signal and the resolution of the jump signal. 7. The step voltage part is subdivided into multiple gears, and the large signal is automatically attenuated during the adjustment process to ensure that the display signal is not limited when the maximum voltage amplitude within the test range is input. 8. FIR digital filtering technology is adopted for audio filtering, which makes the characteristic frequency band more obvious and the filtering performance better. 9. Display the distance of the fault point. The distance of the fault point can be displayed within 0-25m. 10. In continuous mode, the compressed waveform within 15m can be displayed. In single mode, the waveform within 15m can be analyzed.
Operation Precautions of Mine Cable Fault Tester
Operation Precautions of Mine Cable Fault Tester
Coal mines and oil wells are large users of cables. Due to the harsh underground operating environment, the annual damage of various cables is relatively large. In order to save expenses and reduce production costs, each mine and oil well is generally equipped with its own cable maintenance department. However, due to the limitation of testing equipment, the maintenance of cables is often unsatisfactory; The AC / DC cable detection device independently developed and produced takes the high-voltage breakdown method as the principle, so that users can accurately find the cable damage point in the maintenance process. Moreover, the mining cable fault tester also has the function of testing after the old cable is repaired. Therefore, this device is an essential maintenance equipment for cable maintenance companies in coal mines and oil wells. 1. Insulating rubber pad shall be added before the equipment. 2. Operators shall wear insulating rubber shoes and insulating gloves. 3. The tested cable core and high-voltage terminal shall be firmly fixed with nuts to maintain good contact and avoid leakage and current increase caused by * * discharge. 4. Irrelevant personnel shall be prohibited from approaching the work site. 5. After one year of use, the transformer oil shall be subject to withstand voltage inspection in time, and the withstand voltage shall not be less than 30KV / 2.5in. 6. Regularly (depending on the strength of the equipment), carefully polish the surface of the discharge copper ball with zero sandpaper, and keep the surface and surrounding clean and free of dust. 7. The use effect of the equipment depends on the careful maintenance of the user, the continuous accumulation of operation experience, and the mastery of the relationship between the ball gap spacing and the discharge voltage of different cables. 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 high voltage cable fault locator, underground cable fault tester, intelligent 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!
The Product Instructions of Cable Tracker
The Product Instructions of Cable Tracker
You should always read and understand product instructions before using a product. The product descriptions of cable trackers also have to be read carefully.This is an example of a technical description written for the cable tracker. The first paragraph is rather long and given in two sentences, so it's not really useful for someone to read the whole thing. The second paragraph uses a lot of words that are easy to remember but might be hard for average users since they might not know what they mean - so we'll need some rephrasing here.What time trackers seamlessly incorporate into Asana?TimeCamp time tracking software does it - with just few clicks you can integrate those two tools directly.First, you have to go to Setting, then to Addo-ons and find Asana Integration and click "Enable" on it.If you are not logged into Asana, you will be redirected to login page and asked for a confirmation to enable the integration. Otherwise, your integration will proceed automatically.Your next step will be choosing which of your workspaces should be synchronized to TimeCamp. Optionally, you can invite people assigned to workspaces. TimeCamp will automatically import all of your projects and tasks. From now on you will be able to track the time spent on each assignment.If you are using Google Chrome, you can install our plugin to track time spent on tasks directly in Asana. Can People Fool Benevolent Brother's 'Alibi Trackers' and Escape?The Museum of Brother Benevolent has been broken into, and his Kindergarten Lunch Box has been vandalized. Both the Box and its glass case was destroyed by a small bomb. This happened at night.It is not clear how the vandal(s) got into the building, but it is huge and has many possible entrance points. There were no Alibi transmissions nearby at the time. Investigators are puzzled.What actually happened was that the sacred Lunch Box had been sent on a tour a few months earlier. Somebody took the opportunity to place the bomb in the Box then, and it was counting down until the fateful night.This was inspired by the novelCan bug trackers be used for tracking tasks other than programming?Bug trackers can definitely be used to track tasks other than programming bugs. As an example, our organization has successfully configured JIRA to handle our customer service department. JIRA is hugely configurable, and the manager at the time spent several weeks creating components, and custom fields to handle everything from new client signups, client setups, billing issues, client complaints and work requests, all the way to cancellations. We've been doing this now for several years, and the sales, client services, and the account management and accounts receivable departments are extremely comfortable with the process.A task is created for the client, and subtasks are created for each of the above issues that come up, whether it be the actual setup, work request, etc.Of course, whether or not something like this will work for you depends on your exact needs. With the examples you gave, I know JIRA would work for you. However, in your case, if you are just needing something like this for you and you only, there are many free or cheap lightweight online task management systems out there that would most likely work better. See the pm-software tag wiki info page or check some of the open or closed questions under the pm-software tag or the tools tag.Are there any cell phone trackers that work with non android/iphone phones?i send it to my email and my other phone and it tells me if its mms or txt.netwhy wont my 2000 chevy trackers trunk open?you need a trunk monkey! google = "trunk monkey suburban ford"How do private BitTorrent trackers monitor how much users upload/download?Some private trackers will identify users by IP address but most give each user a different .torrent file where the announce URL inside the .torrent file is unique for each user to identify them when connecting to the tracker. Combined with the fact that bittorrent clients constantly inform the tracker about how much data they have downloaded and uploaded, this allows the tracker to record a users stats between sessions and even dynamic IP changes
Dry Goods Sharing Brought by Power Cable Pathfinder Manufacturers
Dry Goods Sharing Brought by Power Cable Pathfinder Manufacturers
It is generally believed that wear and aging caused by daily time accumulation and sudden faults caused by external factors will affect the use of cables. Both of them will cause fault trip, interrupt power supply operation, and cause power grid paralysis in serious cases. Among these factors, the time accumulation factor can be controlled artificially, resulting in a very small probability of failure, while the external environmental meteorological factors can not be controlled, resulting in a very high probability of failure and great destructive power. Below, the manufacturer of power cable Pathfinder summarizes this problem. 1、 Lightning strike power cable Pathfinder manufacturers believe that lightning weather is common in rainy season and has great randomness. A large number of transmission lines erected in the field have the characteristics of large tower span and large height difference, which makes the lightning resistance level of the line relatively poor and vulnerable to lightning. In harsh terrain, there are many single circuit lines, and there is no shielding and shunt protection provided by parallel lines, which increases the incidence of lightning accidents. Lightning trip accounts for the largest proportion of transmission line faults, and the lower the voltage level, the higher the probability of lightning fault. In order to reduce the probability of lightning accidents on transmission lines, it is necessary to prevent flashover, arc building, direct strike and line interruption. The following protective measures shall be taken: 1. Erect lightning conductor. 2. Add coupling ground wire. 3. Reduce the impact grounding resistance of iron tower. 4. Neutral point indirect grounding system is adopted. 5. Strengthen the line insulation level. 6. Automatic reclosing shall be installed. 7. Install tubular lightning arrester. 2、 Typhoon weather is accompanied by strong wind and rainstorm, and accidents such as conductor galloping, wind deviation, line breaking and tower falling will occur on the transmission line. Broken lines and inverted towers are prone to North-South disconnection. With the increase of the designed wind speed of the power system on the transmission line, the probability of line breaking and tower falling accidents decreases, but the probability of accidents caused by violent swing of conductors, wind bias discharge and damage of floating objects is high. For the vibration lines with low wind speed, most of the lines can be controlled by installing anti vibration devices. In case of strong wind speed, the following measures can be taken: 1. Add anti vibration hammer and heavy hammer device to increase the vertical load carrying capacity of the transmission line and reduce the left and right swing amplitude of the line. 2. Install damping wires and armour rods, increase the number of split wires, strengthen conductors, and ensure the safe distance between conductors and iron tower. 3. The suspension mode of V-shaped insulator string is adopted to enhance the insulator resistance to lateral drift with the wind and reduce the wind deflection swing angle of insulator string. 4. When designing tower type and erecting transmission line, it is considered to leave a large distance between conductors, move down the hanging point, or lengthen and widen the cross arm. 3、 Mountain fire is caused by high temperature, human factors and other factors, which makes the air in the state of high temperature and low humidity for a long time. It is located in the mountainous terrain, between the transmission line crossing forest vegetation and the earth or between phase lines. Due to the rise of thermal dissociation of air particles, the increase of charged charge and the acceleration of particle movement The occurrence of line flashover tripping due to the formation of conductive channel accounts for 90%%uff0c of mountain fire tripping, which is the main cause of mountain fire tripping. It also includes the burning of line insulation at high temperature and the discharge of conductor to tower. In view of the mountain fire phenomenon, we should start with the fire prevention measures to reduce the incidence of mountain fire: 1. Control the height, quantity and type of trees near the tower base. 2. Emergency response measures shall be established, and safety passages with sufficient length and width shall be reserved. 3. The line protection system is reliable and sensitive. 4. Establish a real-time monitoring system and improve the monitoring effect; ⑤ Increase line inspection and eliminate hidden dangers by season, time period and weather conditions.
Secret of Pipeline Detector Selection Method
Secret of Pipeline Detector Selection Method
Pipeline detector is a common pipeline detection equipment with stable performance and accurate detection. Depth and direction of gas pipeline, water pipeline, cable, etc. How to select a pipeline detector? Many netizens want to know. Today's Xiaobian will give you a brief introduction. If you are interested, you might as well refer to this article. The pipeline detector can quickly and accurately detect the position, direction and depth of underground water pipeline, gas pipeline, metal pipeline and cable, as well as the position and size of the damage point of the anti-corrosion coating of steel pipeline without damaging the ground covering soil. Pipeline detector is one of the necessary instruments for water supply companies, gas companies, railway communications, municipal construction, industrial and mining, capital construction units to transform, maintain and survey underground pipelines. How to select the pipeline detector: 1. According to your own needs: many pipeline detectors are only suitable for some detection requirements. When selecting, you should understand the application scope of the pipeline detector. 2. Understand the test method of the pipeline instrument, whether the operation is simpler and the interface is more intuitive. 3. Understand the function of the pipeline instrument and whether the sounding capacity meets your needs. 4. Whether the configuration of accessories is complete, such as clamp (generally used for cable detection in dense areas), rechargeable battery (saving detection cost), etc. 5. The sustainable development of the instrument and the ever-changing technology are also a test standard of the instrument. 6. The compatibility of the instrument, whether the reception and transmission frequencies are wide, which is conducive to detection and expansion of use. According to the detection principle of pipeline detector, it can be divided into two categories: 1. One is to detect metal pipelines, electric / optical cables and some non-metallic pipelines with metal marker lines by using the principle of electromagnetic induction, which is referred to as pipeline detector for short. Advantages: fast detection speed, simple and intuitive, convenient operation and high accuracy. 2. The other is to use electromagnetic wave to detect underground pipelines of all materials, which can also be used to find underground buried objects, commonly known as radar, also known as pipeline radar. Advantages: it can detect pipelines of all materials. Any instrument is not perfect and needs to be used together to give full play to their perfection.
New Technology of Optical Fiber Communication
New Technology of Optical Fiber Communication
1. Concept of WDMWDM (wavelength division multiplexing) technology is a technology that transmits multiple wavelength optical signals in one optical fiber at the same time.The basic principle of optical wavelength division multiplexing (WDM) is that the optical signals of different wavelengths are combined (multiplexed) at the transmitting end and coupled to the same optical fiber on the optical cable line for transmission, and the optical signals of combined wavelengths are separated (demultiplexed) at the receiving end for further processing, and the original signals are recovered and sent to different terminals. Therefore, this technology is called optical wavelength division multiplexing, Referred to as optical wavelength division multiplexing technology.How wide is the bandwidth of optical fiber?As shown in Fig. 7.6, there are two low loss transmission windows in the optical fiber: the wavelength is 1.31 μ m(1.25~1.35 μ m) Window, corresponding bandwidth (| Δ f|=|- Δλ c/ λ 2|, λ and Δλ Are the central wavelength and corresponding band width respectively, C is the speed of light in vacuum) is 17700 GHz; Wavelength 1.55 μ m(1.50~1.60 μ m) The corresponding bandwidth is 12500 GHz.When the two windows are combined, the total bandwidth exceeds 30thz. If the channel frequency interval is 10GHz, ideally, one fiber can accommodate 3000 channels.At present, some optical devices and technologies are not very mature, so it is difficult to realize optical frequency division multiplexing (OFDM) with dense optical channels. In this case, wavelength division multiplexing with small channel spacing in the same window is called dense wavelength division multiplexing (DWDM).At present, the system is an optical communication system composed of 8, 16 or more wavelengths on a pair of optical fibers (single optical fiber can also be used) in the 1550nm wavelength range, in which the spacing between each wavelength is 1.6nm, 0.8nm or less, which corresponds to the band width of 200ghz, 100GHz or narrower.WDM, DWDM and OFDM are not much different in essenceIn the past, technicians used to use WDM and DWDM to distinguish between 1310 / 1550nm simple multiplexing and 1550nm intensive multiplexing, but at present, DWDM technology is used in telecom applications.Since the multiplexing of 1310 / 1550nm exceeds the gain range of EDFA and is only used in some special occasions, WDM is often used to replace DWDM.WDM technology is of great significance for network upgrading, developing broadband services (such as CATV, HDTV and IP over WDM), fully tapping the potential of optical fiber bandwidth and realizing ultra-high speed optical fiber communication. Especially WDM and EDFA have a strong attraction to modern information network.At present, "erbium doped fiber amplifier (EDFA) dense wavelength division multiplexing (WDM) non-zero dispersion optical fiber (NZDSF, i.e. G.655 fiber) photonic integration (PIC)" is becoming the main technical direction of long-distance high-speed optical fiber communication lines in the world.If all optical fiber transmission links in an area are upgraded to WDM transmission, we can set an optical cross connection device (OXC) for cross connection of optical signals in wavelength units or an optical add drop multiplexer (OADM) for optical uplink and downlink at the intersection (node) of these WDM links, and a new optical layer will be formed on the physical layer originally composed of optical fiber links.In this optical layer, the wavelength channels in adjacent optical fiber links can be connected to form an optical path across multiple OXC and OADM to complete end-to-end information transmission, and this optical path can be flexibly and dynamically established and released according to needs, which is the eye-catching and new generation WDM all-optical network.2. Basic form of WDM systemOptical wavelength division multiplexer and demultiplexer are the key components of WDM technology. The device that combines signals of different wavelengths and outputs them through an optical fiber is called multiplexer (also known as multiplexer).On the contrary, the device that decomposes the multi wavelength signal sent by the same transmission fiber into each wavelength and outputs it respectively is called demultiplexer (also known as demultiplexer).In principle, this device is reciprocal (bidirectional reversible), that is, as long as the output and input of the demultiplexer are used in reverse, it is a multiplexer.Therefore, the multiplexer and demultiplexer are the same (unless there are special requirements).The basic composition of WDM system mainly includes the following two forms: dual fiber unidirectional transmission and single fiber bidirectional transmission.(1) Dual fiber unidirectional transmission.Unidirectional WDM transmission means that all optical paths are transmitted in the same direction on one optical fiber at the same time.As shown in Figure 7.7, dimmed signals with different wavelengths containing various information will be sent at the transmitter λ 1, λ 2,…, λ N is combined by optical multiplexers and transmitted unidirectionally in one optical fiber.Since the signals are carried through different light wavelengths, they will not be confused with each other.At the receiving end, signals of different wavelengths are separated by optical demultiplexer to complete the task of multi-channel optical signal transmission.The principle of transmission through another optical fiber in the opposite direction is the same.(2) Single fiber bidirectional transmission. Bidirectional WDM transmission means that the optical path transmits to two different directions on one optical fiber at the same time. As shown in Figure 7.8, the wavelengths used are separated from each other to realize bidirectional full duplex communication.Several key system factors must be considered in the design and application of bidirectional WDM system:For example, in order to suppress multi-channel interference (MPI), we must pay attention to the influence of light reflection, isolation between bidirectional paths, type and value of crosstalk, power level value and mutual dependence of two-way transmission, optical monitoring channel (OSC) transmission and automatic power shutdown, and use bidirectional fiber amplifier at the same time.Therefore, the development and application of bidirectional WDM system are relatively demanding, but compared with unidirectional WDM system, bidirectional WDM system can reduce the number of optical fibers and line amplifiers.In addition, by setting an optical add drop multiplexer (OADM) or optical cross connector (OXC) in the middle, the optical signals of each wavelength can be merged and shunted, and the wavelength add / drop and route allocation can be realized. In this way, the inserted or separated signals can be reasonably arranged according to the traffic distribution of optical fiber communication lines and optical networks.3. Performance parameters of optical wavelength division multiplexerOptical wavelength division multiplexer is an important part of wavelength division multiplexing system. In order to ensure the performance of wavelength division multiplexing system, the basic requirements for wavelength division multiplexer are:• low insertion loss• high isolation• flat in band and steep out of band insertion loss• good temperature stability• multiple channels• small size, etc(1) Insertion loss insertion loss refers to the additional loss caused by the addition of optical wavelength division multiplexer / demultiplexer, which is defined as the ratio of optical power between the input and output ports of the passive device, i.e(7.1)Where Pi is the optical power sent into the input port; Po is the optical power received from the output port.(2) Crosstalk suppression system crosstalk refers to the influence degree that the signals of other channels are coupled into a channel and degrade the transmission quality of the channel. Sometimes, this degree can also be expressed by isolation. For demultiplexer(7.2)Where Pi is the wavelength λ I is the input optical power of the optical signal, and PIJ is the wavelength λ The optical signal of I is connected in series to the wavelength of λ Optical power of channel J.(3) Return loss return loss refers to the ratio of the optical power returned from the input port of the passive device to the input optical power, i.e(7.3)Where PJ is the optical power sent into the input port, and PR is the return optical power received from the same input port.(4) Reflection coefficient reflection coefficient refers to the ratio of reflected light power PR to incident light power PJ at a given port of WDM device, i.e(7.4)(5) Working wavelength range working wavelength range refers to the wavelength range in which WDM devices can work according to the specified performance requirements( λ Min to λ max)。(6) Channel width channel width refers to the wavelength interval between light sources to avoid crosstalk.(7) Polarization dependent loss (PDL) refers to the maximum change of insertion loss caused by the change of polarization state.
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.
Wire Tracker Software, Low-Cost Wire Recorder& Data Collector
Wire Tracker Software, Low-Cost Wire Recorder& Data Collector
Just like other digital marketing services, the best wire tracking service also provides a percentage of leads for free. But the percentage will vary depending on your company and industry.A wire tracker is a website where you can upload your content and see how it was distributed, but the ability to track which pages on which devices got a particular piece of content is limited. In addition, there are limitations about the number of devices allowed to connect.Content is king and also data. Data needs to be collected in a form that can be analyzed and used for better product marketing.Wire Tracker is an AI writing assistant that helps content writers generate content ideas based on data streams they collect through all kinds of sources - web, email, downloads, videos, Instagram etc. It easily generates hundreds of articles per day for its client.The main idea is to find and track all of the web pages that contain your content.The best wire tracker can not only help with the tracking of your leads, but also provides you a qualitative analysis of them - what kind of people they are and how they react to your marketing materials.If your business sells products that need to be tracked, here are a few tools that can help you with that.Best Wire Tracker is a free tool for business owners to track their sales in real time. It helps businesses to forecast inventory needs, monitor sales and expand their customer base.With the help of a wire tracker, we can easily keep track of what content we have written and how long it took us to write it.Wire Tracker can be used to track various pieces of content, such as blog posts, articles, press releases etc. It allows you to easily record the time spent on each article you have written.The powerful, intuitive and easy-to-use Wire Tracker allows you to search for and track content on any topic. You can even generate custom reports with just one tap.The Wire Tracker uses artificial intelligence to analyze the content on a specific topic. It categorizes words in the text as well as segments of the text on that particular phrase or event, then automatically generates segmentation data based on those segments. This helps marketers find what they need more easily.The machine learns how to understand your content by analyzing it, and eventually becomes smarter than you are as an individual author of that content combined with your knowledge and expertise.This is a great way to get content ideas for your clients. It's very easy to setup and can be used on any platform.The wire tracker is a software that helps you to track your email and contacts. You can also use it to share files with people.One of the best-known online wire tracking sites is Wire Trackr. It is a great tool to track your online marketing campaigns. It provides you with a full picture of how well and efficiently you are doing your marketing activities. This means that you can focus on what really matters, which is making money from it, instead of worrying about the overall performance.Wire Tracker is the name of a new AI writing assistant that has been developed by a startup. It uses artificial intelligence to help writers write more effective and more engaging content:The idea of "wire tracker" is to organize the content writing process. It consists of three phases, namely:Wire Tracker is an online tool that enables teams to follow the content of a document from start to finish. It allows them to see what the document is doing, and track it as it is being created.Wire Tracker can be used by different types of clients, for example: legal teams, internal teams or third-party agencies.The purpose of this blog is to give you a review of the top 3 services for generating wire content.Being a creative person is hard. You often get stuck in the creative mode and don't know how to open your creative powers. To relieve you of this pressure, we have come up with this article that will help you out. It will guide you through all the steps and tricks to start putting your creativity into action.Wire Tracker is a free service that helps you to create wireframes for your website, landing pages and blog posts in just five minutes by tracking all the interactions on social media such as Linkedin, Twitter, Facebook etc. It gives real-time visual feedback of each interaction so that you can see what is happening at any given point in time on social media channels like LinkedIn or Twitter etc. The tool provides you with useful analytics to understand which links are being opened by users and
Cable Fault Detection and Search Method
Cable Fault Detection and Search Method
For direct short circuit or broken cable fault, the multimeter can be used for direct measurement and judgment; For indirect short-circuit cable fault and grounding cable fault, use a megger to telemeter the insulation resistance between core wires or the insulation resistance between core wires and ground, and judge the cable fault type according to its resistance value. The following describes the method of cable fault finding: zero potential method. Zero potential method is also known as potential comparison method. It is suitable for short cable core to ground fault. This method is simple and accurate, and does not need precision instruments and complex calculation. The measurement principle is as follows: connect the cable fault core wire in parallel with the comparison wire of the same length. When applying voltage ve at both ends of B and C, it is equivalent to connecting the power supply at both ends of two parallel uniform resistance wires. At this time, the potential difference between any point on one resistance wire and the corresponding point on the other resistance wire must be zero. On the contrary, the two points with zero potential difference must be the corresponding points. Because the negative pole of the micro voltmeter is grounded and equipotential with the cable fault point, when the positive pole of the micro voltmeter moves to the point when the indicated value is zero on the comparison wire, it is equipotential with the cable fault point, that is, the corresponding point of the cable fault point. S refers to single-phase knife switch, e refers to 6e battery or 4 No. 1 dry batteries, and G refers to DC microvolt meter. The measurement steps are as follows: 1) connect battery E on phase B and C core lines, and then lay a comparison conductor s with the same length as the fault cable on the ground. The conductor shall be bare copper wire or bare aluminum wire, with equal cross section and no intermediate joint. 2) The negative pole of the micro voltmeter shall be grounded, and the positive pole shall be connected with a long flexible conductor. The other end of the conductor shall be fully contacted when sliding on the laid comparison conductor. 3) Close the knife switch s, slide the end of the flexible conductor on the comparison conductor, and the position when the microvolt meter indicates zero is the position of the cable fault point. High voltage bridge method high voltage bridge method is to measure the DC resistance of cable core with double arm bridge, then accurately measure the actual length of cable, and calculate the cable fault point according to the positive proportional relationship between cable length and resistance. For direct short circuit between cable cores or short circuit point, the contact resistance is less than 1 & omega; The judgment error is generally not greater than 3m, and the contact resistance at the fault point is greater than 1 & omega; The resistance can be reduced to 1 & Omega by increasing the voltage and burning through; Next, measure according to this method. When measuring the circuit, first measure the resistance R1 between core wires a and B, R1 = 2RX R, where Rx is the phase resistance value from phase a or phase B to the cable fault point, which is only the contact resistance of the short contact. Then move the bridge to the other end of the cable and measure the DC resistance R2 between A1 and B1 core wires, then R2 = 2R (l-x) r, and R (l-x) is the phase resistance from A1 phase or B1 phase core wire to the cable fault point. After measuring R1 and R2, short circuit B1 and C1 according to the circuit shown in Figure 3, and measure the DC resistance value between B and C core wires, then 1 / 2 of the organization is the resistance value of each phase core wire, expressed by RL, RL = RX R (l-x), from which the contact resistance value of the fault point can be obtained: r = R1, r2-2rl table. Therefore, the resistance value of the core wires on both sides of the fault point can be expressed by the following formula: RX = (r1-r) / 2, R (l-x) = (r2-r) /2. After the three values of Rx, R (l-x) and RL are determined, the distance X or (l-x) between the fault point and the cable end can be calculated according to the proportional formula: x = (Rx / RL) l, (l-x) = (R (L-2) At the end of the cable, measure the capacitance currents IA1, IB2 and IC3 of the core wire of each phase to check the capacitance ratio between the intact core wire and the broken core wire, and preliminarily judge the approximate point of the broken wire distance. According to the capacitance calculation formula C = I / (2 & PI; Fu), when the positive voltage U and frequency f do not change, C is directly proportional to I. because the frequency of power frequency voltage is f (frequency) Constant, as long as the applied voltage is kept constant during measurement, the ratio of capacitance to current is the ratio of capacitance. If the total length of the cable is l and the distance of the core wire breaking point is x, then IA / ic = L / x, x = (IC / IA) 50. In the process of measurement, as long as the voltage remains unchanged, the reading of ammeter is accurate and the total length of cable is measured accurately, the measurement error is relatively small. The so-called sound measurement method is to find out according to the discharge sound of faulty cable. This method is more effective for the flashover discharge of high-voltage cable core to insulating layer. The equipment used in this method is DC withstand voltage tester. TB is high-voltage test Transformer, C refers to high-voltage capacitor, ve refers to high-voltage rectifier silicon stack, R refers to current limiting resistance, Q refers to discharge ball gap, and l refers to cable core. When capacitor C is charged to a certain voltage value, the ball gap discharges to the cable fault core, and the cable core discharges to the insulating layer at the cable fault, producing a loud and loud spark discharge sound. For open laying cables, it can be found directly by hearing. If it is buried electricity For cable, first determine and mark the cable direction. When searching, put the pickup close to the ground and move slowly along the cable direction. When the sound of Zi and Zi discharge is the largest, this is the cable fault point. Pay attention to safety when using this method, and assign special personnel to monitor at the end of the test equipment and the end of the cable. The cable fault locator produced by our company can not only measure the sound, but also To detect the magnetic signal, the signal strength is displayed visually and synchronously, which can locate the cable fault point faster and more accurately.
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