Guide to Buy Laser Range Finder in NOYAFA

Guide to Buy Laser Range Finder in NOYAFA

2021-11-10
NOYAFA
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Laser Range Finder is the 'chosen representative' of SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED. By digging into the industry dynamics and market trends, our designers keep innovating ideas, designing the prototype, and then screening out the best product design. In this way, the product has a very competitive compact design. To bring an excellent user experience, we carry out millions of tests on the product to make it stable in its performance and be of long lifespan. It proves to be not only in line with the aesthetic taste of consumers but also satisfy their actual needs.We wish to maintain the hard-earned reputation for bringing added value to the business of customers with our NOYAFA branded products. Throughout the entire development process, we urge to build long-term relationships with customers, bringing them the most dependable products to help their business achieve results. NOYAFA products always help customers maintain a professional image.We continue to work on gaining a greater understanding of global consumers’ expectations for more sustainable Laser Range Finder and suchlike products and related purchase motivations. And we render the best customer service through Best Cable Tester Supplier in China _ Noyafa.
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Fluke MicroScanner PoE Network Tester   Insight
Fluke MicroScanner PoE Network Tester Insight
When connected to an Ethernet Alliance certified power source, the device displays the maximum available power class in the microscanner POE compared to the required power, as the logo of the powered device shows. The performance requirements are marked with numbers from one to eight, indicating the amount of energy sources required in each class. Microscope POE kit for technicians $39 Copper Verifi-Ion Tester Swift Simple POE Verifier Ion.Mauritius, Mozambique, Rwanda, Seychelles, Somalia, South Sudan, Tanzania, 131. I purchased this tool in order to solve a recent installation of new Cat6 Ethernet cables in the range of 50-140 ft. Cat6 Gigabit Solid Conductor - Snagless UTP Ethernet Cable (RJ45M / M Blue) 7.5 ft (2,286 m ).These are quality certified cables with a bandwidth of up to 10 Gbit / s transmission speed. The cheaper $10 connectivity tester showed that the new Cat 6 Ethernet cables, which run in the 50-140ft range, were well connected, but I could see a pattern of failure when they eventually ran out of throughput on Iperf when they got 100Mbps connections. For 60 times the price, the tester ranged the cable up to $10, and he said the connectivity was fine.Communication technicians of today have much more problems than just wiring. Technicians need to rule out a whole range of cable service problems to determine the cause of connection problems. If you know anything about copper soldering, I found it in this article on HowStuffWorks.You may create your own design with washi ribbons in dark blue tones or elegant white lace trim if required for your order. Fluke Network Link Sprinter 100% Network Tester has a chamfer to fit different pipe sizes and thicknesses. Your motorcycle's Pro Life value is an essential product for motorcycle owners to protect your bike from weather damage. You can take off and leave no marks or stains, and we do not change the distance as required by the Fluke network clincher.James Sinn, owner of Sinn Development, an Oakville-based design, installation and troubleshooting service provider, said that the ability to display Switch ports, VLANs, PoE power and Ethernet information on LinkIQ-IE is a great addition to their toolkit. Fluke Networks says that by combining its state-of-the-art cable measurement technology with basic testing of industrial Ethernet switches, the Linkiq-IE accelerates and simplifies the detection of network failures with a touch screen interface similar to that of a smartphone. Link Sprinter Network Tester uses expert troubleshooting techniques with its colored LEDs to achieve actionable results with a LED interface that highlights problem areas, switch names and links between switches at the push of a button on each switch.The Link Sprinter Network Tester detects Ethernet problems in less than nine seconds. Read more about the increasing use of Ethernet in industry-based Automation World Research. MicroScanner (tm) PoE reduces confusion during your PoE installation by providing fast and easy PoE verification.
Which One Is Lying: Multimeter Or Voltage Tester? Why?
Which One Is Lying: Multimeter Or Voltage Tester? Why?
First off you should be checking for voltage with the voltmeter with one lead on the black wire and one lead on the white wire..the voltmeter should read 120 volts /-10% if it does then that is what it should read...If you check with a voltmeter with one lead on the black wire and one lead to ground you still should read 120 volts /- 10% as long as you do not have an isolated ground for the system. ..now with one lead on the white wire and one lead to ground you should not read any voltage with the voltmeter... I always use a Simpson 260 voltmeter to tets for voltage ,ohms ,or contunity.. I have never ever used any other kind of voltage tester other than some good digital voltmeter. 1. If the function/range switch is set at 200 VAC, what will the multimeter read if a measurement is made directl? A. 0 volts. At least theoretically. If there is current flowing in the circuit connected to the fuse, you may measure a tiny PD across a good fuse due to its resistance. You should also read 0 volts across a blown fuse if the load is DISconnected. If the load is connected and the fuse is blown/ breaker has tripped, you will measure 120V. 2. Analog multimeter won't calibrate to zero Analog meters can get knocked out of whack from being banged around or a modest drop. It may need a trip to the repair shop. A cost conscious move might dictate a replacement is in order 3. Why is resistance increasing while I'm measuring using a multimeter? The question which led me here was in regard to the increasing resistance of an agarose gel petri dish over time. As suggested by Olin, I tried changing my electrodes from copper to another material, but saw no difference.After some more research, and taking into consideration that agarose gel contains salt ions which carry the current, it is likely that the Ohmmeter is in a way depleting the ions available for conductance since they have been drawn to their respective poles. 4. Can I use 1 to 2 power adaptor to measure current with multimeter No this is not possible with a standard multi-outlet adapter. They are wired so that all outlets are in parallel. So you could measure voltage but not current, as you need a series connection to measure current. There are specialized measurement adapters available which allow you to measure both, current and voltage and with the right tools you can measure power then 5. Multimeter shows different voltages for positive and negative voltage(interchanging multimeter probes) for same source Different positive and negative readings on a dual-slope ADC can be caused by the maker using a crummy integrating capacitor with a large amount of dielectric absorption. It's also possible the battery is dying and the integrator is saturating on one side but not the other. Your other issue sounds like a grounding problem. 6. Blown fuse on car by using multimeter The other possibility is that with the probe you touched earth or ground at the same time as the live terminal or wire - sometimes making a small probe extension is good. I have used a paper clip before 7. How do you test a 30 amp RV outlet with a multimeter? Set the meter at AC volts. Insert the two multi meter leads into the 2 slotted holes in the outlet. The amperage is irrelevant. The meter will only test for voltage. If you want to test for amps, you'll need an amp clamp.How do you test a 30 amp RV outlet with a multimeter?. 8. kv to volts using multimeter? Impossible! You could change the pulsed DC voltage to a more steady voltage using capacitors, but you can not measure kVolts on a device that only measures upto 500V. If you are a real smart guy you could use resistors in series to lower the measured voltage, and from there calculate how much volt the pulses are, but that would require some thorough knowledge in electric theory (formula's and methods to calculate)
Working Principle of Cable Fault Tester
Working Principle of Cable Fault Tester
Working principle of power cable fault tester consists of three main parts: power cable fault tester host, cable fault locator and cable path tester. The host of the cable fault tester is used to measure the nature and total length of the cable fault and the approximate position between the cable fault point and the test end. The cable fault locator determines the exact location of the cable fault point based on the approximate location of the cable fault point determined by the host of the cable fault tester. For buried cables with unknown direction, a pathfinder shall be used to determine the underground direction of the cable. The basic method of power cable fault test is to apply high-voltage pulse to the fault power cable to produce breakdown at the cable fault point. When the cable fault breakdown point discharges, it generates electromagnetic wave and sound at the same time. The working principle of the application of arc reflection method (secondary pulse method) in cable fault location: firstly, a high voltage pulse with a certain voltage level and energy is applied to the faulty cable at the test end of the cable to make the high resistance fault point of the cable break down and burn arc. At the same time, add the low-voltage pulse for measurement at the test end. When the measurement pulse reaches the high resistance fault point of the cable, it encounters an arc and reflects on the surface of the arc. When arcing, the high resistance fault becomes an instantaneous short-circuit fault, and the low-voltage measurement pulse will change obviously in impedance characteristics, so that the waveform of flashover measurement becomes a low-voltage pulse short-circuit waveform, making the waveform discrimination particularly simple and clear. This is what we call the "secondary pulse method". The received low-voltage pulse reflection waveform is equivalent to the waveform of a wire core completely short circuited to ground. Superimpose the low-voltage pulse waveform obtained when releasing the high-voltage pulse and when not releasing the high-voltage pulse. The two waveforms will have a divergence point, which is the reflected waveform point of the fault point. This method combines low-voltage pulse method with high-voltage flashover technology, which makes it easier for testers to judge the location of fault point. Compared with the traditional test methods, the advantage of the secondary pulse method is to simplify the complex waveform in the impulse high-voltage flashover method into the simplest low-voltage pulse short-circuit fault waveform, so the interpretation is very simple and the fault distance can be accurately calibrated. The triple pulse method adopts the double impact method to prolong the arc burning time and stabilize the arc, which can easily locate the high resistance fault and flashover fault. The triple pulse method has advanced technology, simple operation, clear waveform and fast and accurate positioning. At present, it has become the mainstream positioning method of high resistance fault and flashover fault. The third pulse method is an upgrade of the second pulse method. The method is to first measure the reflected waveform of the low-voltage pulse without breaking through the fault point of the measured cable, then impact the fault point of the cable with the high-voltage pulse to generate an arc, trigger the medium voltage pulse when the arc voltage drops to a certain value to stabilize and prolong the arc time, and then send the low-voltage pulse, Thus, the reflected waveform of the fault point is obtained. After the superposition of the two waveforms, it can also be found that the divergence point is the corresponding position of the fault point. Because the medium voltage pulse is used to stabilize and prolong the arc time, it is easier to obtain the fault point waveform than the secondary pulse method. Compared with the secondary pulse method, the triple pulse method does not need to select the synchronization time of arc burning, and the operation is also more simple.
Best Cable Tester and Reviewer
Best Cable Tester and Reviewer
The introduction of cable testerA cable tester is a device that is used to test the quality of a cable. It can be used when people install their first home network to make sure that they have everything in place and are ready to connect all the devices.When people are setting up their first home network, there is always the fear that they might not have everything in place to connect all their devices efficiently. That's when they need a cable tester like this one.Cable testers come in different shapes and sizes, but this particular one makes it easy for users to test plugs and cables with ease. It also comes with an on/off switch for convenience purposes. There are multiple companies selling these types of products like Amazon or Best Buy, but it’s really important that you go through reviews before buyingTips for cable testerCable testers are the best way to ensure that you have the ideal cable for your TV. However, they come in a wide range of shapes and sizes.This guide contains tips to help you find the right one for your needs.How to use cable tester?As a cable tester, you need to identify if your cable has any problems. Here is a step-by-step guide of how to use a cable tester.If the connection is not strong or there are no picture and sound, troubleshooting starts by using the remote control provided in the package. You should also check if you have a faulty power cord as it may cause intermittent connections.When trying to fix the connection, make sure that you have an HDMI port on your TV and that it is connected with an HDMI cable. If both of these are not present, it causes signal loss and prevents viewing or sound from existing on your TV or speakers.The specifications of cable testerAs the technology is developing, more and more people are beginning to use these cable testers. Cable testers are designed with two screens that show both live video as well as a map of the cable's conductor.The manufacturer offers a three-year warranty on the tester. It also has a wireless remote control for viewing and controlling the program in real time.The product instructions of cable testerIn designing a new product, an engineer must consider many things - the needs of the customer, the needs of the company, and how to make sure they are meeting those needs. All of these factors will determine what instructions will be written for a product. In this section, I'm going to focus on product instructions and what they need to cover.The product instructions are an important part of your customer relationship. They should provide information about what your current customers need and how to use your products in detail. This includes wiring diagrams and other helpful information that can help people use it correctly and effectively.Product instruction should also include warnings about safe use as well as safety concerns about using it improperly could lead to personal injury or deathThe application of cable testerThe cable tester comes in handy during the installation of cables and wires, where it is used to ensure that the cables are safely and securely fixed.The cable tester facilitates the installation process by providing a safe way for users to connect wires without difficulty. It also provides an easy way of testing cables and ensuring that they are working properly before continuing with the installation process. Despite being a rarely used device, it is one of those indispensable tools which can be found in every home or office.The device has a simple design - it has two pieces of metal at either side which serve as terminals that connect to different points on data cables or electrical wires and provide an easy way for users to test if there is any voltage or current flowing through them.
Fiber Optical Tester - How to Use the Best One for Your Needs
Fiber Optical Tester - How to Use the Best One for Your Needs
Small portable microscopes were once developed to test fiber optic cables. One of the best applications of such a device was the identification of trace fibres to determine the correct connection. This made it possible to find a specific fiber in a multifiber cable for proper connection and installation.Fiber optic is a fantastic medium for spreading light signals, but it needs to be amplified in contrast to copper cables. High-quality singlemode fibers have attenuation and a power loss of only 0.1 dB per kilometer. The signal power (measured in dB) is higher at the head of the network connection than at the end of the customer connection, and it is impossible to suffer light degradation over the length of the connection.When testing fiber optic cables for optical losses, the fiber tester must be connected to a test source that provides optical light on a standard launch cable calibrated to a 0 dB loss reference. For example, when the light source operates at a wavelength of 1310 nm, the optical power meter for testing should be set to 1310.A power meter at the other end of the circuit measures the test source for each fiber tested and quantifies the loss (dB) of each fiber during the test. For double-end loss tests, attach the cable to be tested to two reference cables connected to the source, one per meter. This allows you to measure the two connectors lost at one end for each power cable in the cable.If your electricity meter has an internal memory for data recording, make sure you know how to use it. Use your equipment in the office to test one of your reference tests (bridging cables in each direction) and use the end loss test to make sure it is good.Connect the optical source to Jumper 1, testing one end of the system fiber. Apply the adapter and insert the second jumper for the test, Jumper 2, which contains the same size fiber as the first, and an optical power meter. For the receiver, a separation cable is attached to the receiver socket to measure the performance of the meter.The power of the fiber optic cable or optical return loss is the light pulse that enters the end of the fiber optic core and the percentage of light reflecting back to the source. Optical fiber loss varies according to wavelength, so the optical power meter uses the same wavelength as the light source. The optical performance at the end of the fiber is the basis for the loss measurement, and the power source is presented to the receiver.Both singlemode and multimode fibers (VCSEL) are sensitive to optical return losses (ORL) expressed in decibels (dB). It affects the fiber and laser light source and reduces the data transmission speed.The OTDR test measures the backscattering of light to assess the quality of fiber optic cables. If the light at the other end is not visible, fractures or other problems may occur along the length of the fibre strand.The best way to test such impurities is to use a fiber optic or fiber optic microscope, a special microscope developed for inspection of fiber optics. Fiber optic communication systems operate in the electromagnetic spectrum in the infrared range which is invisible to the human eye.Fiber optic cables have become a more popular choice than Ethernet for network and telecommunications applications due to their high data transmission speeds over long distances. Fiber is the dominant medium for all types of mission-critical data center connections, backbone buildings, and remote campus networks. As the popularity of bandwidth-intensive applications increases, demand for fiber-optic installations and infrastructure is accelerating.Fibre optic cables play an essential role in the telecommunications industry. Testing fibre optic cables is considered one of the most confusing and misunderstood stages of installing a fibre optic system, but it is one of the last and most important procedures for installing a fibre optic network. For optimal savings in system performance, it is important to select a fiber optic cable that is matched to a spectroscopic analysis system.AFL Optical Fiber Identifier (OFIS) is a robust, easy-to-use test instrument that detects the presence of signals in optical fibers. The OFI is an important tool for field technicians to ensure live fibres are not separated and provides the ability to track the fiber from end to end.The optical time domain reflection (OTDR) is used as a fiber optic cable tester to test optical loss. The fiber optic cable is guided to one end through an OTDR to analyze the backscattering of light returning to the source using a high-power laser light that emits a predetermined pulse interval and is connected to the cable. This is the one-sided fiber test method used by fiber optic testers to analyze losses and pinpoint their location for installation, maintenance and troubleshooting.Fiber optic testing requires special tools and instruments to select the appropriate components and cables for the equipment to be tested. The most important test of insertion loss in an installed fiber optic cable system is carried out with a light source power meter (LSPM) and an optical loss tester (OLT), which is required by international standards to ensure that the cable is not lossless within the acceptance and installation budget.If it is a long installation cable with intermediate connections, you should verify each individual connection with an OTDR, as this is the only way to ensure which is the best. For this purpose, the loss testing method specified in OFSTP 1.4 is tested for losses in the installed cable system. Power Meter Optical Loss Test Set (OLT) Test Kit With the right equipment and adapter, the cable system you are testing (e.g.
What Is the Difference Between a Live Cable Identifier and an Uncharged One
What Is the Difference Between a Live Cable Identifier and an Uncharged One
Cable identification instrument can accurately find out the characteristics of cables in a bundle of cables, which is a common equipment. Its wide range of applications can be used not only in cable fault handling, but also in cable erection or migration. There are two kinds of cable identification instrument, one is live cable identification instrument, and the other is not live. So what's the difference between them? Next, let's have a look. How to find a specific cable in a bundle of cables? How to accurately identify cables? Many power maintenance companies most commonly use the live cable identification instrument in power cable erection, migration, maintenance and fault treatment. However, in the face of complex cable and environmental differences, it has become very difficult to identify the running cable. What is the difference between a live cable identifier and a dead cable Identifier? How to distinguish quickly? 1. Working principle of the cable identification instrument the main working principle of the live cable identification instrument is to transmit the phase coded signal with an average value of 0 on the transmitting caliper, receive the single chip microcomputer in the caliper, filter the received signal through hardware and software, and then carry out phase identification. When the receiving clamp clamps the cable according to the current direction, the identified cable ammeter deviates to the right, Accompanied by audible and visual indication. The current direction of other cables is opposite to that of the identified cable, and the ammeter pointer deviates to the left. The working principle of the dead cable identification instrument is to add a special signal to the identified cable, which should be received by a special receiver. The periodic unipolar voltage pulse is fed into the cable to be identified. The direction of the pulse current fed into the cable can be used as an obvious identification standard, and the outgoing current only passes through this cable. 2. Basic parameters of the cable identifier: insert the red and black wiring plugs of the transmitting caliper a into the two red and black wiring posts corresponding to the transmitting source, and clamp the transmitting caliper a on the identified cable. The arrow on the transmitting caliper a points to the cable terminal. On the identified cable two meters away from the transmitting caliper, clamp the receiving caliper B to the cable, and the arrow on the caliper must point to the cable terminal. Then check the current direction and test connection direction. At the identification point, identify each cable with receiving caliper B. During identification, the arrow on the receiving caliper must always point to the terminal direction of the cable, and the cable shall be clamped one by one. On the identified cable, the current meter pointer of the receiver must deflect to the right, and the audible and visual alarm prompts 3. Precautions for the use of the cable identification instrument (1) if the operating cable has voltage and no load, there will be no current flowing on the cable. At this time, the magnetic field cannot be detected. It is considered to be an uncharged cable, which is very easy to misjudge. (2) If the cable is not running, but if this cable is parallel to other running cables, there will be induced current and magnetic field. At this time, the instrument will also have indication, and misjudgment will occur. (3) If there are multiple cables in the cable trench, these multiple cables will generate a magnetic field. At this time, there will be a magnetic field generated by 50Hz current in the whole area. At this time, there will be a magnetic field in the whole area, which makes the discrimination impossible. It is easy to misjudge.
Pulse Flashover Method for Fault Detection of High Voltage Cables
Pulse Flashover Method for Fault Detection of High Voltage Cables
Cable has a very important application scenario in our daily life. It can be said that we can't live without cable. In order to ensure the normal use of the cable, it is necessary to regularly detect and maintain the cable. In case of cable failure, the fault point shall be found out in time for maintenance. There are many cable fault maintenance methods. Today, I mainly introduce one of the high-voltage cable fault detection methods, pulse flashover method. For high resistance fault, due to the large resistance at the fault point, the reflection coefficient at this point is very small or almost equal to zero. When measured by low-voltage pulse method, the reflected pulse amplitude at the fault point is very small or there is no reflection, so the instrument can not distinguish it. There are two common high voltage flashover measurement methods, namely DC high voltage flashover measurement method (direct flashover method for short) and impulse high voltage flashover method (impulse flashover method for short). 1、 DC high voltage flashover method (referred to as direct flashover method) when the fault resistance is very high and a stable resistance channel has not been formed, the gradually increased DC voltage can be applied to the tested cable. After reaching a certain voltage value, the fault point is preferably broken down to form flashover. The flashover arc is used to form a short-circuit reflection on the added voltage, and the reflected echo is formed by a high resistance source at the input end to form an open circuit reflection. In this way, the voltage will be reflected many times between the input and the fault point until the energy is exhausted. 2、 Impulse high voltage flashover method (impulse flashover method for short) when the fault resistance is reduced and a stable resistance channel is formed, the DC high voltage cannot be added due to the limitation of equipment capacity. At this time, it is necessary to use impulse voltage test. The DC high voltage charges the cable through the ball gap until breakdown, and still generates short-circuit reflection with the flashover arc formed by it. The measuring inductance L shall be added at the cable input end to read the echo. The radio wave is reflected by short circuit at the fault point and l at the input end, and multiple reflections will be formed during this period. Due to the self induction phenomenon of inductance L, it begins to show open circuit reflection due to the current blocking effect of L, and shows short-circuit reflection after a certain time with the increase of current. The whole circuit consists of capacitor C and inductance L, which constitutes a large process of L-C discharge. Therefore, the wave process at the line input is a nearly attenuated cosine curve superimposed with fast pulse multiple reflection wave. 3、 High voltage cable fault detector is generally used. High voltage cable fault is high resistance fault, and high voltage flashover method is used to measure the distance of fault point. This method uses st-330b cable fault locator as experimental equipment. 1. Wiring mode: firstly, complete the wiring of high-voltage flashover as required; Then, connect the sampler with the ranging host with a double clamp test line, and then place the sampler next to the grounding wire of the high-voltage capacitor. 2. Equipment operation (1) start up, select the sampling method as flashover, the pulse width is the default, the cable type is the physical type, and the reading accuracy is the default. (2) Use the high-voltage equipment to discharge the cable, and then click the orange sampling button on the right to start sampling until the waveform is collected. Press the sampling key again to stop sampling. (3) Study the waveform, move the vernier ruler to the starting point and ending point of a waveform, read the waveform, and the distance of the fault point will be automatically measured in the upper left corner.
List of Fault Finding and Detection Methods for Low Voltage Cables
List of Fault Finding and Detection Methods for Low Voltage Cables
Generally, the radiation path of high-voltage cable is easy to determine, but the high-voltage cable needs to be filled with sand bricks to be deeply buried. Its fault point is difficult to find. The radiation length of low-voltage cable is short, the radiation is random and the path is unclear. The following small series will introduce the fault finding and detection methods of low-voltage cables. You can simply understand. In order to solve the problem of low-voltage cable fault, researchers have developed and produced a cable fault tester based on the principle of impulse flash method. In order to find and detect the fault of low-voltage cable, first measure the distance with rangefinder. In fact, first judge whether the cable fault is high resistance, low resistance or grounding, and adopt different test methods according to this condition. If it is a ground fault, the low-voltage pulse method of the rangefinder is directly used to measure the distance; If it is a high resistance fault, the high-voltage impulse discharge method should be used to measure the distance. When using the high-voltage impulse discharge method to measure the distance, there are many auxiliary equipment: such as high-voltage pulse capacitor, discharge ball, current limiting resistance, inductive coil and signal sampler. The operation is troublesome, unsafe and dangerous. What is more cumbersome is to analyze the sampling waveform, The knowledge requirements of testers are relatively high. The second step is to find the path (this step can be omitted if the path is clear). When finding the path, add a signal (path signal generator) to the cable, and then the receiver receives the signal. Walk along the path with the signal once to determine the path of the cable. However, the range of this path is about 1-2 meters, which is not particularly accurate. The third step is to accurately locate according to the measured distance. It is based on the sound generated by ignition and discharge. When a loud sound is heard from the headset of the pointing instrument, that is, the location of the fault point is found. Due to listening to the sound, it takes a lot of time to find it due to the influence of environmental noise. Sometimes it can't be found until the evening. When it comes to cross-linked cables, it takes more time. Generally, the sound of internal discharge of cross-linked cables is very small. After almost no hearing, it is only measured. Therefore, this method can solve most of the power cable faults with oil impregnated paper as insulating material. For the cable faults with crosslinked material and polyethylene material as insulating material in recent years, the test effect is not ideal, because the sound generated by ignition and discharge is often very small (the cable skin is not damaged, but the internal discharge of the cable), In this case, only other methods can be used to solve it. We know that the insulation requirements of low-voltage cables are low, and the current is large during operation, which has obvious characteristics after failure. It is specifically classified as follows: class I fault: the whole cable is burned out or a phase is burned out. This fault causes the current relay on the distribution cabinet to act, and the cable is seriously damaged at the fault. Class II fault: each phase of the cable is short circuited. Similarly, this kind of fault causes the current relay and voltage relay on the distribution cabinet to act, and the cable is seriously damaged at the fault point (possibly caused by external force). Class III fault: the cable has only one phase open circuit, the current relay acts, and the damage at the fault point is light but obvious. It may be that the phase current is too large or caused by the cable quality. Four types of faults: internal short circuit of cable, no trace can be seen on the surface. Such faults are generally caused by cable quality, which is relatively rare.
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