Guide to Shop Detect the Fault Point of Low-voltage Cable in NOYAFA

Guide to Shop Detect the Fault Point of Low-voltage Cable in NOYAFA

2021-11-11
NOYAFA
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For Detect the fault point of low-voltage cable and suchlike products development, SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED spends months on devising, optimizing and testing. All our factory systems are created in-house by the very same people that operate, support and continue to improve them afterward. We are never satisfied with 'good enough'. Our hands-on approach is the most effective way to ensure the quality and performance of our products.Lots of signs have shown that NOYAFA is building solid trust from customers. We have got lots of feedback from various customers with regards to the appearance, performance, and other product characteristics, almost all of which are positive. There are a quite large number of customers keeping buying our products. Our products enjoy a high reputation among global customers.Always ready to listen to customers, teams from Best Cable Tester Supplier in China _ Noyafa will assist in guaranteeing the constant performance of Detect the fault point of low-voltage cable throughout its service life.
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How to Quickly Detect the Fault Point of Low Voltage Cable
How to Quickly Detect the Fault Point of Low Voltage Cable
In many years of specific work, people have found that there are many differences between the common faults of high-voltage cables and low-voltage cables. Most of the faults of high-voltage cables are dominated by common faults of operation, and most of them are common faults of high resistance, which can be divided into leakage and flashover; The common faults of cable can only be led, short circuit and open circuit (naturally, high-voltage cable also includes these three conditions). In addition, the cable also has the following characteristics in the whole process of specific application: 1. The laying is blind, and the relative path is not very clear. 2. When laying, it is not buried after filling sand and bricks like high-voltage cables. On the contrary, the buried depth is shallow, which is easy to be damaged by external forces and common faults occur. 3. Cables are generally short, ranging from tens of meters to 500 meters, unlike high-voltage cables, which are usually 500 meters to many kilometers. 4. The compressive strength of the insulating layer is low. When solving common faults and making connectors, the processing technology is relatively simple. 5. Most cables are often burnt and damaged at common fault points. The common fault point is that there is no mark on the surface of the cable, which is very rare. ⒍ the required load changes greatly, and the two colors are usually unbalanced, which is very easy to get hot, resulting in common faults. Considering the above characteristics of the cable and the proposals clearly put forward by many customers and the specific application status of people in each region, the scientific research staff has successfully developed and designed the DW cable fault test mobile phone positioning system: the system software includes two parts: rangefinder and detector. The range finder of hn-213x system software is a completely intelligent system and personalized design scheme. It automatically detects the cable fault point without manual service, analyzes the common fault wave type, and immediately gives the distance between common fault points and common fault characteristics. The rechargeable battery power supply system is selected, which is convenient for field work, small in size, light in weight, easy to use, and does not need all auxiliary machinery and equipment. The cable fault detector of hn-213x system software is an instrument and equipment for simultaneous and accurate positioning and detection of the laying relative path, buried depth and common fault points of directly buried cables. Because it is a mobile phone positioning system for common cable faults based on the magnetic effect of current and the basic principle of step voltage, it mostly considers all standards of cable fault test. This kind of detection system software has many advantages compared with the cable fault detector based on the impulse flash method: 1. A variety of test standards are integrated and the results are mutually certified to clarify the uniqueness of common fault points. 2. Small size, light weight, easy operation by one person, no auxiliary machinery and equipment. 3. The rechargeable battery power supply system is selected, which is suitable for field work without ignition, charge and discharge. 4. The relative path search of cable (which can be clearly in the middle of 30cm), buried depth detection and accurate positioning of common fault points are carried out in the same step with high efficiency. 5. Clarify the common fault points, and the instruments and equipment have visual display information without wave type analysis. ⒍ it will not be harmed by underground conditions (such as bifurcation of cable, bundling, distortion of connector, etc.). Like detecting bombs, it searches common fault points point by point, and the accurate positioning deviation is within more than ten centimeters, which is very accurate. ⒎ it will not be harmed by ground conditions, such as floor tiles, road greening, concrete ground, etc. 8. Check the safety on the spot, there is no risk to the inspector, and there is no secondary damage to the cable. ⒐ high quality and low price are acceptable to ordinary customers. We know that the insulation layer of cable is relatively low. In addition, the electric flow is very large in the whole process of operation, and there are significant characteristics after common faults. The actual classification is as follows: the first kind of common faults: a piece of cable is burned out or a phase is burned out. This kind of common faults lead to the posture of current relay on the distribution box, and the cable is seriously damaged at the common faults. The second type of common fault: short circuit fault of each phase of the cable. Similarly, this type of common fault causes the current relay and voltage relay on the distribution box to be in a bad position, and the cable is also seriously damaged at the common fault point (possibly caused by external force). The third type of common faults: the cable can only be short circuited in one phase, the current relay posture, and the common fault points are slightly damaged but significantly exposed. It may be due to the high voltage of this phase or the quality of the cable. The fourth type of common fault: internal short circuit fault of cable, no mark can be seen on the surface. This kind of common fault is generally caused by the quality of cable, which is relatively rare. Common faults of hn-213x cable can be easily detected by the fusion application of rangefinder and detector in mobile phone positioning system. In addition, the characteristics of different common faults and the length of cable can also be detected separately. The actual situation is as follows: the first type of common faults and the second type of common faults. If the cable is short (less than 500m), the common fault detector can be used to accurately locate the common faults immediately without the cooperation of the distance finder. The common fault points can be identified by stepping in the hand receiver along the relative path (the relative path can be measured while walking). The third type of common fault: because the cable is slightly damaged at the common fault point, the data signal sent by the transmitter leaks less here. When accurately locating the common fault with the detector, the marking scope is narrow. At this time, the distance between the common fault points can be measured with the distance meter, and then the accurate positioning with the detector is also very convenient. The fourth type of common fault: this type of common fault is the most difficult to predict among all cable faults at this stage. At this time, you can use a rangefinder to detect the cable on both sides of the cable, and then compare the detection results with the specific length, so that the common fault point can be defined in a small range (1-3m). At this time, dig the cable and find the problem, Or decisively cut off this section of cable (because the cable is very cheap, the insulation layer is low, and the connector is easy to do), or use a detector to select the audio frequency for accurate positioning in this section, which can also identify the common fault points. At this stage, the cable fault detector based on impulse flashover method, which is applied by many customers of cable fault detector in power engineering, generally can use a distance meter to roughly measure the distance between common fault points when dealing with common faults of low resistance of cable and common faults of dead grounding device (the distance detection of such common fault points does not need high-voltage charging and discharging machinery and equipment, and the bottom pressure single pulse method is used) However, ignition, charging and discharging and listening to sound are still used for accurate positioning of common fault points. In addition, the relative Pathfinder of such instruments and equipment is separated from the designated instrument, which makes it impossible to specify the relative path at the same time when selecting the correct relative path, and usually deviates from the relative path when specifying. Moreover, due to the limitation of the basic principle, the relative Pathfinder of such instruments and equipment finds the relative path of the cable It is impossible to find the exact relative path of the cable when the cable is in the middle of the total width of 1-2m. Considering the applicability, hn-213x cable fault detector just fills the shortcomings of the application. It can accurately locate the common fault points of the cable, detect the buried depth and the relative path smoothly. The instruments and equipment are very vivid in the marking of common faults, relative path and buried depth No need to do technical index analysis or rely on the working experience of the operator. It makes the original complex fault test work become a relaxed and interesting thing. Therefore, many customers of impulse lightning cable tester can form a set of extreme low-voltage cable fault tester if they have another DW cable fault detector and the original distance finder. In addition, the The common faults of low resistance and short circuit of external high-voltage cable can also be specified quickly to improve the efficiency many times.
Basement  Businesses
Basement Businesses
So, you want to be your own boss. And you figure a business in your basement is a good way to set up something to be a boss of. Trouble is, you'll probably end up with more bosses than you ever had - every customer who gets you on the phone.Don't worry. Your own business has other benefits, and you'll get to remember a whole lot of them every April, when you find out how much of your money you're keeping out of the tax collector's hands.Your small business doesn't have to be in the basement, of course, but that location often gives people the biggest tax writeoff, says chartered accountant Sheldon Buchalter. If your home is a bungalow with a big full basement, you may well be able to claim half of many of the costs of your house. Buchalter shudders at the number of self-employed people who don't know they can claim the cost of a home office, or forget about it from one April to the next."I see it all the time," he says. "I had one guy who had been missing a tax deduction of five grand a year for the last four years. That's close to 10 grand he shouldn't have paid the government."Buchalter himself has an office in his home as well as his cheerfully cluttered, fountain-bedecked place of business at Tepperman Buchalter LLP. He doesn't try to claim the expenses at home, though."You know what they say. Pigs get fat. Hogs get slaughtered," he says. "I'm not using the office at home every day. I use it maybe 10, 15 times a year. It has to be regular, continuous use to be claimed. It's intended for when you have no other office or place to do business."What Buchalter does do, though, is claim for the mountains of clients' files he stores in his basement."If I rented a storage space, it would probably cost $300 a month. Instead, our company pays me $75 a month."The situation can be much more clear cut if your home office is the only place you have to do business. You may not, in that case, even have to set aside a room in the house that's used for nothing but business, although you're much safer with the tax collector if you do. Either way, you need to figure out how much of the expenses for your entire home could reasonably apply to the business.The Canada Revenue Agency prefers that you get a tape measure out of your tool drawer, but Buchalter will have none of that.He usually tells his clients to figure things out on the basis of one floor, say, in a three-floor house, or one room out of however many you have, not counting bathrooms or closets, no matter how big they are. So what's eligible? "You can claim your cleaning lady," Buchalter chortles, "or at least a part of her."Other claimable expenses are more obvious. They include mortgage interest (but not the part of the payments that goes toward the principal owing), property taxes, heat, hydro, water and home insurance. "Don't forget cutting the grass and shovelling the snow," Buchalter says. "You have to make the place attractive for the clients." Repairs and renovations come into the picture, too, but they're a tougher call in terms of what to claim, and tax advisers and collectors may have differing opinions on what's legitimate and what's not."I tell my clients not to claim any portion of general house repairs," Buchalter says. He points to a new roof as an example. Sure, your office won't be much good to you if the rain is as bad inside as out, but then the house won't be habitable either, and won't be worth anything when you go to sell it.Similarly, don't claim the cost of a major renovation - tearing down and putting up walls, and the like - to create your home office.Besides, that kind of work could easily cost $20,000 or more, and that's not the kind of money you can claim as an expense in any one year. Meanwhile, the courts have been pushing the tax collector into a kinder corner in recent years when it comes to expense claims for home offices."You can have a bit of personal use in a home office these days, and CRA still says okay," Buchalter says. "That's a big change in recent years."Buchalter doesn't like to go too far with the tax rules."I tell people they can't use their living rooms or dining rooms as a home office," he says. "But a bedroom or a den is okay."Getting back to the computer in your home office, if you bought the machine since March 2007, you can write off 55 per cent of the cost in the first year, with the rest to follow in later years. That's up from only 30 per cent to start - and may get a little closer to the speed with which computers collapse into the category of obsolete and worthless.All the deductions you do take, though, can add up, so it's not surprising that the tax collector has thrown a wrench into the works. You have to make enough of a profit on your business to cover the home-office expenses, or you don't get to claim them in the current year.The tax collector is giving you more latitude with your other expenses, producing a loss in your business even when you have a "day job" and are using the business loss to reduce the tax you owe on your regular employment income.Whether you're in a home office or an outside office, however, the Canada Revenue Agency may take exception to the kind of business you run and whether you're allowed to claim expenses against your revenue at all."It's the hobby issue," Buchalter says. If you start a mortgage lending business, even the tax collector isn't likely to accuse you of having so much fun that you shouldn't be allowed to deduct expenses. But if you love collecting stamps, and then decide to go into the business of buying and selling them, and you lose money ..."
Model Prototype: Electric Screwdriver
Model Prototype: Electric Screwdriver
For this assignment I decided to design the electric screwdriver with OXOs design practices in mind. Of the three options, I thought this one sounded the most exciting in terms of its features and shape. Once I gathered the necessary tools and information, I dove into the design process. DesignI wanted to use OXOs design practices to design a screwdriver with a comfortable grip and intuitive control. I begun by drawing up some sketches using OXO devices like vegetable peelers and other simple handheld tools for reference. I wanted to emphasize the shape of the handle and make sure that the button locations were logical and quickly accessible. . I came up with a variety designs thinking about the ways a user could interact with the device. Overall, most of my designs had the same shape but some of the features jumped around. Once I settled on a design, I began to plan what materials Id need to build my first prototype. PrototypesI used thick paper and tape to create my first prototype for a quick and rough go at capturing the basic shape and visualizing the main features. I followed my sketches to try and form the handle shape.Once the prototype was finished, I conducted a few informal user tests to determine what aspects could be changed. I noticed that it would be better to switch the placements of the LED screen and speed settings. This seemed like a more logical set up as the the setting buttons would be grouped together. I created a couple more sketches thinking about changes I wanted to make and then set out to create a second prototype. Along with the placement swapping, I realized I should add an off option to the speed settings to avoid accidental activation.I also improved the fluidity of the screw head selector making it closer to the ideal way it should function.In order to create a more accurate sense of the weight , I used foil and clay to build the device. I made my changes for the button and screen locations and used the clay to try and achieve the OXO like handle shape. This prototype was successfully weightier than the previous one.AnalysisOnce the second prototype was completed I began critiquing and gathering feedback from my peers. One feature I noticed while evaluating was that the spin dial for the head selection could have been reversed: instead of spinning a selector to land on a head, one could spin on the heads and line one up with a static selector. This could have made the head selection process more streamlined and might have matched more users mental models but it is hard to tell without testing it.Another interesting idea from critique was that the speed setting would mostly be the most commonly used setting making it more logical for that feature to be the main thumb control. This would then require the the power button to be on the reverses side of the device making it more like a trigger. I realized that I hadnt thought about the actual use of the speed settings and how they play a major role in giving the user control as they use the the device. In my next iteration of the device, I would definitely take this into account. RELATED QUESTION An HOA member dug a hole in my yard saying it was a drainage basin, the water is crossing the road uphill from my house, what can I do to stop him? An HOA member dug a hole in my yard saying it way a drainage basin, the water is crossing the road uphill from my house, what can I do to stop him? Well, if the hole is already dug, then you cant stop him. Its done. Did the HOA send you a notice that work would be done on your property? If so, then your time for doing something has long passed. If not, then you need to contact the HOA (in writing) and ask what is going on, why you werent notified, and how the HOA intends to compensate you for the use of your property for its drainage basin. You can also contact your city/county planning commission and ask whether the drainage basin was authorized and if not, what the commission can do about it.
How to Use Live Cable Identification Instrument to Identify Power Failure and Live Cable
How to Use Live Cable Identification Instrument to Identify Power Failure and Live Cable
Before we use the instrument.. Let's first understand the functions of the instrument panel buttons and what they are used for? Live cable identifier transmitter 1) signal output port: this port sends the signal to the cable to be tested through direct connection coupling. The instrument can automatically detect the connection mode (direct connection or coupling). When no output line is connected to this port, the screen mode menu displays "idle", and no signal is output at this time; 2) Frequency switching: the instrument has four output frequencies: low frequency, intermediate frequency, high frequency and radio frequency. It is suitable for different test systems and has strong anti-interference ability. When this button is pressed, the frequency will be switched between the above frequencies in turn; 3) Power regulation: the instrument adopts constant power output mode, and low, medium and high gears are optional. When this button is pressed, the power will be switched between the above gears. 4) Backlight switch: turn on the backlight for test after the instrument is turned on. When this button is pressed, the backlight will turn on. When it is pressed again, the backlight will turn off. 5) Power switch: the main switch of the whole instrument. When this button is pressed, the instrument enters the test interface; 6) Liquid crystal display: the instrument uses liquid crystal display for man-machine dialogue. 7) charging interface: it is used to charge the signal transmitter and the receiver of live cable identification instrument. 1) power switch: it is responsible for turning on and off the power supply. Press the state to turn on, and then press the key to turn it off; 2) Frequency switching: the instrument has four output frequencies: low frequency, intermediate frequency, high frequency and radio frequency. It is suitable for different test systems and has strong anti-interference ability. When this button is pressed, the frequency will be switched between the above frequencies in turn; 3) Backlight switch: turn on the backlight for test after the instrument is turned on. When this button is pressed, the backlight will turn on. When it is pressed again, the backlight will turn off. 4) Volume adjustment: adjust the sound volume of the speaker according to the demand, and adjust the volume in the order of small - medium - Large - off; 5) Gain adjustment: adjust the system gain according to the demand, the dynamic range is 000-100db, and the default is 60dB after startup; 6) Charging interface: it is used for charging the signal receiver. I believe you have a preliminary understanding of the instrument. Let's explain in detail how to use the live cable identification instrument: 1. Identification of power-off cable 1.1 direct connection conditions â—Ž it must be power-off cable; â—Ž know at least one end of the cable and separate the known end from the system, including disengaging the zero line and ground line; 1.2 signal application â—Ž in this method, the direct connection method is used to apply the signal (as shown in Figure 4); Turn off the power switch of the transmitter, insert the output connecting line into the output line interface of the transmitter, as shown in Figure 4, and connect the wire core with the red clip. Turn on the transmitter power switch and select the frequency: the transmitter has four or two frequencies: low frequency, intermediate frequency, high frequency and RF; After selecting the frequency, select the gear according to the actual situation. The transmitter is divided into high gear, medium gear and low gear. Generally, try to select a relatively low gear to save the power of the battery. After selecting the gear, the instrument automatically performs impedance matching. After matching, the transmitter displays the stable fault impedance of the current system, and the icon starts to rotate. 1.3 signal detection (identification) â—Ž connect the receiving coupling clamp to the receiver with a connecting wire with four core plugs at both ends; â—Ž turn on the power switch of the receiver to make its frequency correspond to the transmitter; â—Ž clamp the red line or cable head of the transmitter straight line with the receiving coupling clamp to reduce the gain so that the signal strength is about 800. Remember the current gain and strength value, and take this value as the reference value; â—Ž at the point to be tested, clamp the exposed cable with coupling pliers and find the cable with strong signal, that is, the cable to be found. 2. Identification of live cable 2.1 coupling conditions the cable must have known exposure points, and both ends of the cable must have grounding points or points associated with the ground (the live cable has been associated with the ground through the zero line); The coupling position shall be as far away from the end as possible; 2.2 one end of the four core aviation line equipped with the coupling signal application instrument is connected with the four core aviation base on the transmitting coupling clamp, and the other end is connected with the transmitter to complete the connection between the transmitting clamp and the transmitter; Put the transmitting coupling clamp on the cable exposure point, which is the signal application point. Note that the coupler should be completely closed; Turn on the power switch, select the frequency and match the impedance of the instrument; 2.3 signal detection (identification) â—Ž connect the receiver and receiver coupling clamp with four core aviation line; â—Ž at the transmitting point, clamp the receiving coupling clamp on the cable to reduce the gain so that the signal strength is about 800. Remember the current gain and strength value, and take this value as the reference value; â—Ž at the point to be measured, clamp the receiving coupling clamp on the exposed cable and find the cable with strong signal, that is, the cable to be found. If the cable is long, the signal will have a certain attenuation. At this time, compare the cable with strong signal.
Specifications for Cable Fault Tester
Specifications for Cable Fault Tester
1. Long test distance: 32km2. Detection blind area: 1m3. Reading resolution: 1m4. Power consumption: 5va5. Service conditions of cable fault detector: ambient temperature 0 ℃ 40 ℃ (limit temperature - 10 ℃ 50 ℃), relative humidity 40 ℃ (20 90)% RH atmospheric pressure (86 106) kpa6. Volume: 225 × one hundred and sixty-five × 125mm38. Weight: 2kg1 traditional cable fault detection method 1.1 measuring resistance bridge method this method has hardly changed for decades. For short circuit fault and low resistance fault, this method is very convenient. The bridge method is based on the principle that when the bridge is balanced, the product of the corresponding bridge arm resistance is equal, and the length of the cable is directly proportional to the resistance. 1.2 low voltage pulse reflection method low voltage pulse method, also known as time domain reflection method (TDR), means that the pulse reflector independently measures the low resistance and open circuit faults of the cable without passing through the high voltage impactor. 1.3 pulse voltage sampling method pulse voltage sampling method, also known as impulse high voltage flashover method, is a test method for measuring high resistance leakage and flashover faults. Firstly, the cable fault is broken down under the DC or pulse high voltage signal, and then the distance is measured by recording the time required for the discharge pulse to go back and forth between the measuring point and the fault point. Pulse voltage method mainly includes DC high voltage flashover (direct flashover method) and impulse high voltage flashover (impulse flashover method). 1.4 traditional method of cable fault location ①acoustic measurement method this method uses the breakdown and discharge sound of the fault point during high voltage impact to accurately locate the fault point. ② Dear customers: Hello, our company is a high-quality development group with strong technical force, providing high-quality products, complete solutions and superior technical services for the majority of users. The main products are high voltage cable fault tester, cable fault locator, 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!
How to Diagnose and Solve Cable Leakage with Cable Fault Tester
How to Diagnose and Solve Cable Leakage with Cable Fault Tester
How can the cable fault tester diagnose and solve the cable leakage? As the main cable fault, when the power cable leaks to the earth, it will produce a strong to weak directed electric field gradient around the fault point on the ground. The amplitude and direction of the signal can be measured by Bao Shun Tong cable fault measuring equipment along the cable path. Before and after the fault point, the direction pointed by the galvanometer pointer is opposite, so as to find the fault point of the cable and achieve the purpose of accurate positioning. 1. Cable fault diagnosis depends on the nature of the fault. Cable fault can be divided into low resistance grounding or short circuit fault, high resistance grounding or short circuit fault, wire break fault, wire break and grounding fault and flashover fault. Cable fault diagnosis can determine the type and severity of cable fault, and it is also convenient for testers to test it with different test methods according to different fault types. For example, for high resistance faults, the impulse flash method can be used to locate the fault location. 2. Cable fault location. Cable fault location is also called rough measurement. There are two rough measurement and location methods: electric bridge method and wave reflection method. At present, wave reflection locator is more popular. However, several cable faults are difficult to find by wave reflection method, such as insulation defect points of high-voltage cable sheath, steel tape armored low-pressure cable, PVC cable and short cable can not be located. In addition, some high breakdown points cannot be broken down under impulse voltage and are difficult to locate. 3. Cable fault point. It is also called precise measurement. The cable fault can be accurately fixed through the methods of acoustics, electromagnetism, electronic signal processing and electronic cancellation theory. The LCD can display the sound pulse, magnetic pulse and the distance between the fault point and the probe test point at the same time. At present, the cable fault can be accurately fixed by the following four methods: (1) Acoustic measurement method: the high-voltage pulse generator discharges the fault cable, the fault point generates an arc and generates a discharge sound. When the cable is directly buried, it generates a seismic wave. The acoustic probe of the pointing instrument picks up the seismic wave signal and amplifies it and outputs it through the headset or meter head. (2) Step voltage method: it is mainly aimed at the fixed point of outer sheath grounding fault with requirements for cable outer sheath insulation. Now, step voltage method can also be used for the fixed point of some directly buried unarmored low-voltage cables and wire core grounding fault. (3) Electromagnetic method and audio method: fix the point with electromagnetic wave or audio method, that is, determine the fault point by using the change of electromagnetic wave signal or audio signal at the front and rear points of cable fault. (4) Acoustic magnetic synchronization method of cable fault tester: it is the comprehensive application of acoustic measurement method and electromagnetic wave method. Then, according to the above operation methods, we believe that the fault point can be found soon, and we can quickly repair and restore the normal operation of power.
How to Quickly Locate Cable Faults
How to Quickly Locate Cable Faults
With the different cable laying methods, the difficulty of cable fault location is gradually increasing. Among them, the positioning and search of bridge, tunnel and open laying in ditch is relatively simple, and the positioning and search of direct burial is the most difficult. When the fault nature is simple, the special cable fault location equipment can be used to locate the fault within dozens of minutes. When the fault is special, it often takes 4-5 days or even longer to locate the fault. How to quickly locate cable faults? When using echo method for cable fault location, sometimes by transferring the fault phase and wiring mode, complex faults are often transformed into simple faults, and the fault location is quickly determined to win time for the emergency repair of on-site lines, which is of great significance to the power supply user department. Low voltage power cables are generally multi-core cables. After laying and continuous use, they generally show two core and multi-core phase to phase or phase to ground short circuit faults. Sometimes, when it is detected that the fault waveform collected by a core is not ideal, it can be considered to convert the wiring to other fault cores for fault waveform detection, which often has unexpected effects. The collected and detected waveforms will become more typical and regular, so the specific location of cable fault point can be determined quickly. During the long-term on-site measurement of cable customers, it is found that the fault of small cross-section copper core directly buried power cable (35mm2 and below) and aluminum core cable may be accompanied by short-circuit and wire breaking fault at the same time. During on-site detection, changing the short-circuit fault to wire breaking fault measurement according to the different fault nature of each fault core will often double everything with half the effort. For the medium voltage direct buried power cable with extruded armor as the inner lining, the fault is mostly caused by external mechanical damage. When the insulating core fails, the inner lining may have been damaged. In case of special cable insulation fault, it is difficult to collect waveform with professional cable fault instrument. It can be considered to use the acoustic method to apply the high-voltage pulse directly between the steel strip and copper shielding layer of the cable, which will often be fixed quickly. In the field measurement process, we also found that when using the acoustic measurement method to locate the fault point of low-voltage cable, when the high-voltage line and ground wire are connected between the bad phase and the metal shield or armor, the sound is very small, so the probe can not be used to listen to the fixed point, and the effect is not ideal. Through the actual listening side on site for many times, it is found that if the distance between the discharge ball gap is appropriately increased, and the high voltage and grounding wire are connected between the two phases of the fault, the discharge sound will become larger and the fault point will be determined quickly.
What Should We Pay Attention to When Using Live Cable Identifier
What Should We Pay Attention to When Using Live Cable Identifier
The emergence of electricity has broken people's original lighting mode and provided us with a convenient and comfortable living environment. Cable has the function of transmitting electric energy and plays a very important role in life. The demand for electricity is so great that sometimes the cable will inevitably have problems. Live cable identification instrument is one of the commonly used fault detection equipment. 1. The operator shall read the operation manual in advance, master the function, working method and work preparation of the instrument, and carry out correct test requirements. 2. Before the test, disconnect both ends of the tested wire with armored grounding, and ground the far end (one end) of the core wire. 3. The two output wires of the cable identifier shall be clamped in red on the core wire of the tested wire and grounded in black. 4. Before turning on the transmitter, the output adjustment knob must be turned counterclockwise to zero before starting. Slowly adjust the output adjustment knob to make the output reach 5a-15a (usually adjust the adjustment knob in the range of two-thirds). If the grounding resistance of the distribution station system is greater than 4 ohms, the output current is less than 8a, and the receiver instrument head can work normally, as long as it can deflect in the positive and negative directions. 5. Note: during field use, if the grounding resistance is too small and the output adjustment knob of the transmitter is zero in one clock cycle, the output current will be very large, and there is a protective circuit action in the transmitter (indicating a small swing of the plug). In Article 2, in the actual test, there are more than two connections between the two transformer chambers between the same cable conduit and other cables, The grounding resistance is connected because there are other armored cables in operation, and the change is very small, even close to zero. If the output current of the transmitter is too large and there is a protection circuit, the resistance can be tested in series in the transmitter loop test. After the test, the temperature of the test resistance is very high. Note that other 1-2 ohm resistors greater than 20W can also be used instead of the test resistance. 6. Before identifying the cable on site, please calibrate the receiver of the live cable identification instrument at the beginning of the wire according to the instrument calibration requirements in the instruction manual. 7. Standard for cable field identification: when the sensor is pasted on one of the cables for test, the header of the receiver will lean to one side and swing more. When testing on other cables (keeping the clamping direction of the sensor the same), the receiver instrument head will lean to the other side and swing less. The cable with the receiver instrument head leaning to one side and swinging sharply is the cable to be identified.
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