Guide to Buy Network Cable Detector in NOYAFA

Guide to Buy Network Cable Detector in NOYAFA

2021-10-05
NOYAFA
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SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED is an expert when it comes to the production of quality network cable detector. We are ISO 9001-compliant and have quality assurance systems conforming to this international standard. We maintain high levels of product quality and ensure proper management of each department such as development, procurement and production. We are also improving quality in the selection of suppliers.In the process of NOYAFA expansion, we try to persuade foreign customers to trust our brand, though we know that a similar product is also made in their home country. We invite overseas customers who have cooperation intention to pay visits to our factory, and we work hard to convince them that our brand is trustworthy and better than the competitors'. Customer's ideas and requirements for network cable detector will be fulfilled by a team of dedicated and skilled professionals who find solutions to meet your design and development needs. At Best Cable Tester Supplier in China _ Noyafa, your customized product will be handled with the utmost quality and expertise.
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What Are the Methods of Cable Fault Detection
What Are the Methods of Cable Fault Detection
The fault types of power cable mainly include parallel fault and series fault. Series fault refers to the disconnection of multiple or one conductor in the cable. Usually, it is difficult to detect the series fault before disconnecting a conductor in series. It is easy to find the series fault only when there is a real short circuit. Parallel fault is caused by external insulation aging caused by cable overload operation for a long time, and then partial discharge, resulting in parallel fault. The cable fault different from the length difference and resistance value is broken down, and the cable fault can be divided into high resistance type, low resistance type and open circuit fault. So what are the methods of cable fault detection? Bridge method: bridge method is a traditional method of cable fault detection, which can achieve very ideal results. This method is convenient and fast with high detection accuracy. It belongs to a common cable fault detection method. However, due to the low bridge voltage difference and galvanometer sensitivity, it is only suitable for fault detection with small cable resistance. Moreover, it is difficult to detect the open circuit fault of equipment and cable with high resistance. High voltage bridge method: high voltage bridge method is a common fault detection method in cable fault detection. Its detection principle is that in the high-voltage bridge, when the constant current power supply pierces the cable, it will ensure a large bridge current to a certain extent, so as to form a certain potential difference on both sides of the overall bridge, so as to count the fault points on the basis of coordinating the bridge. This method is suitable for high voltage constant current power supply, and can effectively expand the detection range of high resistance of bridge. Relatively speaking, the result is more convenient and accurate. In addition, for the research theory of bridge method, the characteristics of cable centerline resistance and proportional distribution of the whole line can promote the formation of bridge detection system. Impulse high voltage flashover method: impulse high voltage flashover method is widely used in some methods of cable fault detection. The detection principle of this method is to apply impulse high voltage at the beginning of the faulty cable, so that it can quickly puncture the place where the fault occurs, and record the data information of voltage sudden change at the moment of the fault place. Through the analysis of wired fault point and wired initial data information, the time distance is tested, so as to obtain the fault location and uncertain countermeasures. Low voltage pulse reflection method: when low voltage pulse emission method is used to detect cable fault, low voltage pulse shall be injected into the damaged line. When the pulse is transmitted along the cable to the fault point, when the inappropriate impedance is encountered in the process of transmitting current, the reflected pulse is displayed on the detection device and reflected through the data record of the device, and then the round-trip time difference of the output pulse and the cable wave speed are calculated, so as to obtain the distance between the fault point and the test point. This method is very simple and can make the test results particularly significant. When it is difficult to determine the fault data, it can be detected directly. However, it also has disadvantages, that is, it is not suitable for high resistance fault and flashover fault. Secondary pulse method: for the secondary pulse method, it is effectively applied to form the impulse high-voltage pulse at the moment of the integrated high-voltage generator and introduce it to the cable fault location. On the premise of effectively piercing the fault location, it can prolong the uninterrupted time of arc formation at the fault location after breakdown. Obviously, it must be clear that at the same time, a trigger pulse can trigger the automatic trigger device of the secondary pulse and the operation of the cable detection instrument. On the basis of starting the automatic trigger device of the secondary pulse, two low-voltage pulses are transmitted. Through the device of forming the secondary pulse, the cable is effectively transmitted on the fault detection cable, so as to break down the cable. Using the cable fault detector, observe the floating characteristics of voltage waveform and the reflection wavelength in the whole process of forming arc, comprehensively and systematically record the screen of detection equipment, and distinguish various current fluctuations, one of which reflects the actual length of cable and the other reflects the actual distance of short-circuit fault.
The Benefits of Using the Right Non Contact Voltage Tester
The Benefits of Using the Right Non Contact Voltage Tester
You hear continuous chirping and see a series of flashes confirming that the tester has detected the voltage. This type of voltage tester allows you to test voltage without having to open or splice wires. This tool can also be used to dim the basement in situations where the light does not work, a small but helpful feature as it is the only model we have tested.In fact, the mere presence of an electric field can trigger this type of voltage tester. Non-contact voltage testers work by measuring a small amount of current coupled to the circuit between the tester and ground. Since they are light, they can detect this current without direct contact.A contactless tester is a device which allows the user to check the voltage of a variety of electrical appliances without touching wires or parts. The functioning of these devices is based on the use of capacitor couplings to detect electric fields. The built-in sensors at the top of the tester detect the presence of voltage without touching the conductor, socket or power cable.Volt sticks are designed for a specific purpose: to detect the presence of AC voltage. The electric fields connected to the AC voltage are present in the current conductor, and the reason for this is the requirement of direct contact with the conductor. Another reason is that electric fields have to build up and collapse in order to induce a current in the volt rod circuit, which happens with alternating voltages.If you refer to the capacitors in the video above, you can see that the current flows at an AC voltage. With a DC voltage, the electric field must build up and remain in one direction until a current is induced in the voltage stick circuit, and since there is no volt stick in the circuit it does not indicate the presence of a DC voltage. This is the reason why testers do not work with DC capacitors and why transformers do not work with DC voltage.A few ticker markers, including the Southwire Dual Range non-contact voltage tester can detect two voltage ranges. The higher voltage range is the default, while the lower voltage range (tension range) at the upper end is kept at 1,000 V. Most voltage testers do not register voltages below, giving Southwire a significant advantage over simpler models.Electrical testers are a good value option with impressive IP67 water resistance. Mid-range models such as the SouthWire non-contact voltage tester are designed to withstand the elements. If you need an outdoor quality tester, you will appreciate the IP67 waterproof housing of these pins.The Small Non-Contact Voltage Tester (NCVT) is ideal for NCVT electricians working with HVAC, ventilation and air conditioning systems (HVAC). Not only is it the most reliable model in the price range of non-contact voltage testers, but also has the new Voltbeat technology that enables self-testing. When something goes wrong the problem can be detected by the sensor or from a device such as a nearby voltmeter or oscilloscope.
Correct Opening Method of Cable Fault Tester
Correct Opening Method of Cable Fault Tester
Why can't the fault point be found when using the cable fault tester? What is the correct opening method of cable fault tester? We need to understand some common problems of cable fault first, and then effectively solve the fault problems according to different problems. With the development of China's power system, the laying of high-voltage cables is becoming more and more common. Basically, the cables connected between distribution stations are very long. As long as the cables fail, it is very difficult to troubleshoot, and most of them are buried cables, which is difficult to judge. At this time, we need a cable fault tester to judge the correct fault point for us, So that we can quickly restore the power supply, we can analyze the problem according to several common cable faults. Cable faults are commonly divided into high resistance short circuit fault, phase to phase short circuit fault, low resistance fault, flashover fault and other common faults on site. 1. The low voltage pulse reflection method is applicable to low resistance (less than 10 times of wave impedance), grounding and open circuit faults, and can test the full length of the cable and the propagation speed of radio waves in the cable. In case of low resistance or grounding fault of the cable, the equivalent impedance at the cable fault point shall be the parallel connection of fault resistance and cable characteristic impedance. The smaller the cable fault resistance is, the more obvious the reflected waveform is. When the cable fault resistance is zero, it is total reflection. Because the equivalent impedance at the test end (input impedance of the test instrument) is greater than the characteristic impedance of the cable, the same polarity reflection pulse is generated at the test end. At the low resistance or ground fault, because the fault resistance is less than the cable characteristic impedance, the incident pulse generates the reverse polarity pulse after the fault point and transmits it to the test end. The falling edge of the received reverse polarity pulse corresponds to the reflected waveform of the cable fault point. In case of open circuit fault of cable, the equivalent impedance of cable fault is the series of fault resistance and cable characteristic impedance. Open circuit is equivalent to infinite fault resistance. In this case, the incident pulse will form total reflection, and the reflection pulse of the same polarity will be generated at the test end. The rising edge of the received pulse of the same polarity corresponds to the reflection waveform at the fault point. 2. First, use a certain voltage level The high voltage pulse with certain energy is applied to the faulty cable at the test end of the cable, causing breakdown and arcing at the high resistance fault point of the cable. 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 cable 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 cable fault point. Compared with the traditional cable fault test method, the advantage of the secondary pulse method is to simplify the complex waveform in the impulse high-voltage flashover method into the low-voltage pulse short-circuit fault waveform, so the interpretation is very simple and the fault distance can be accurately calibrated. 3. 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 find the fault point waveform than the secondary pulse method. The cable fault tester often has to solve the following problems: 1. The diversity and complexity of cable faults determine that the cable fault tester needs complete functions and diverse test methods. 2. 2. To solve the fault, many instruments should be used together in order to achieve the result of solving the fault. 3. Different test methods are needed for cable insulation, fault location and different faults. 4. Sometimes the difficulty of cable fault test lies in the snow with a thickness of more than one meter and bad weather (the temperature is more than minus 20 degrees), which is also a test for underground cable detectors and testers to pass the above understanding. I believe you basically have some general and judgment on the cable fault problem and how to use the cable fault tester normally.
The Best Wire Tracker
The Best Wire Tracker
A wire tracker is a tool that helps you get the most out of your content marketing strategy. It's a great tool to boost your content marketing ROI and increase conversion rates for your clients.A wire tracker does not need much time or money but it does require some skills. However, it can be easily learned by anyone with basic programming knowledge.We can use a wire tracker to automate our content marketing activities and make sure that we are getting the best results from them:A piece of content that will generate a lot of comments, questions and concepts.Section topic: How to create a 'Influencer' page on FacebookIntroduction: A person can be both an influencer or an authority. They have the power to influence others and are influential in their field. The infographics we seen on Facebook are created by people who have amassed thousands of followers through their posts, so it is not hard to imagine how valuable this kind of content is for brands. We must use the data gathered from these people and construct our own page based on their data instead.Wire Tracker is a custom text and image editor for wireframes and visual designs. It can be used to produce high-quality mockups, sketches, or even full products. It can be used to create prototypes on the go with the free service that is offered by Wire Trackers.The best wire tracker will be able to automatically create a report of all the content generated during the day for your client.The best wire tracker for professional automation is Wire.it.Wire.it is a real-time messaging and collaboration platform that makes it easy for businesses of all sizes to generate content and communicate with any number of people at any time, anywhere. It provides real-time, on-demand collaborative processes that enable organizations to use the latest tools in digital communication with anyone at any time, anywhere.In this section we will talk about the best Wire Tracker for professional automation in detail:The best wire tracker is an application that allows the content writer to keep track of all the links on a website. The content writer can use it to create valuable backlinks, analyze them and then submit them for approval.We should not think of this as a replacement for human programmers. Although it does help in promoting more automated writing process and also saves time in submitting content ideas to review teams etc, it also has its own limitations in most cases. It cannot do anything about copywriting mistakes (e.g., using “can” instead of “could”), so we need to remember that there is a very fine line between a useful tool and a useless tool for professional writers who are trying to do their job properly.When you need to generate a list of words that describe a given item, or even when you need to create a list of actors from different movies or TV series and then choose the best of them for your advertisement. We can use this feature to quickly make our work easier and save time.A good wire tracker will help you to keep track of your work and complete tasks on time. It will also allow you to know the progress of each task from start to finish.This guide will help you to find the best wire tracker for professional automation.This is a comprehensive guide to every type of wire tracker available on the market. It covers everything from simple projects to complicated solutions with detailed and clear descriptions of how each one works. The author has also developed a comparison chart which shows the pros and cons of each wire tracker so that you can decide which one suits you best based on your skill set and budget limitations. You can also use our comparison chart to find out which one is best suited for your specific needs. This article provides an overview of different types of wire trackers and their features as well as their pros and cons, covering everything from simple projects to complex solutions, showing all possibilities in details along with comparative charts for easy comparisons between them.An automation is a set of processes that are performed to some given task.In the text world, automation includes things like automatic spellchecker, spell checker, automatic grammar checker etc.
Knowledge About Frequency Counter & Crystal Tester Kit Circuit & Schematic
Knowledge About Frequency Counter & Crystal Tester Kit Circuit & Schematic
1. KSWG of frequency counter & crystal tester kit circuit & schematicKSWG (96.3 MHz) is a commercial FM radio station licensed to Wickenburg, Arizona. It is owned by Barna Broadcasting Company and airs a classic country radio format, using the moniker "Real Country 96.3." The station is considered a rimshot broadcaster because its transmitter is more than 50 miles from downtown Phoenix, Arizona. KSWG's signal is primarily heard in northwest suburbs of the Phoenix market.The studios and offices are on West Wickenburg Way in Wickenburg. The transmitter is off South Vulture Mine Road, also in Wickenburg.------2. History of frequency counter & crystal tester kit circuit & schematicKFMA, KMEO and KBSZToday's KSWG began life in September 1992 on 93.7MHz as modern rock station KFMA. The station was owned by Harold Shumway alongside KTIM 1250 AM, and as KFMA, it was run by former KUPD/KUKQ general manager Lloyd Melton. However, when KEDJ-FM was born months later, it pushed KFMA, with its partial-market signal, out of the format. Early in 1993 KFMA became KMEO, an easy listening music station using call letters made famous in Phoenix by KMEO-AM-FM (now KIDR and KMXP); Melton sued Shumway in Maricopa County Superior Court.On March 24, 1995, KMEO flipped to new age music as KBSZ "The Breeze". Geoff Stirling, a new age enthusiast and Canadian-American media mogul, had an unspecified stake in the station. KBSZ also made moves to increase its coverage; it picked up use of a translator from KEDJ at 96.3MHz, improving its signal in metro Phoenix. It also moved its main signal to 94.1 with increased power in March 1996; the KBSZ call letters also turned up on the AM station on March 1, 1996, where they remain today (even though the station has moved across the Valley to Apache Junction). However, low audience turnout for the last concert the station sponsored and low ad sales prompted Circle S to move in a new direction.KSWGIn July 1996, KBSZ-FM became KSWG "94 Country" with a classic country as KSWG. It was one of two new country stations in the Phoenix market that month, alongside KXLL/KBUQ "Young Buck Country".In 2006, KSWG relocated from 94.1 to 96.3. The station was sold to Barna Broadcasting in 2012.In 2017, an interference dispute lodged by KSWG against KXEG translator K241CS (96.1) prompted a counter-filing alleging that the facility on which KSWG was operating was not the one it was licensed for; it was directional toward Phoenix, and the tower was 57 feet (17m) higher than authorized.------3. Transfusion therapy (Sickle-cell disease) of frequency counter & crystal tester kit circuit & schematicRed blood cells (erythrocytes) from donors contain normal hemoglobin (HbA), and transfusion of normal red blood cells into people with sickle cell disease reduces the percentage of red cells in the circulation containing the abnormal hemoglobin (HbS). Although transfusion of donor red blood cells can ameliorate and even prevent complications of sickle cell disease in certain circumstances, transfusion therapy is not universally beneficial in sickle cell disease.------4. Practical Mechanics of frequency counter & crystal tester kit circuit & schematicPractical Mechanics was a monthly British magazine devoted mostly to home mechanics and technology. It was first published by George Newnes, Ltd., in October 1933, and ran for 352 issues until the magazine's termination in August 1963. Practical Mechanics was edited by Frederick J. Camm until his death in 1959.With an emphasis on things its readers could reasonably construct themselves, the magazine featured numerous articles on how to build things around one's house, such as a sink or bathtub. It also regularly featured more fanciful articles on how to build things with less obvious applications around the home, for example a Geiger counter, or an aeroplane for 25 (not including the cost of an engine).The early issues were in black and white. The magazine began printing in color at an unknown date.Practical Mechanics was one of a number of DIY British publications, including Practical Householder, Practical Motorist, and Practical Wireless, also founded by Frederick J. Camm.------5. CKHR-FM of frequency counter & crystal tester kit circuit & schematicCKHR-FM is a Canadian radio station that broadcasts community radio programming on the frequency 107.3 FM in Hay River, Northwest Territories.The station is owned by the Hay River Community Service Society. The current volunteer station manager is Mark Lundbek. Aside from broadcasting, Lundbek is also an internet professional who specializes in website design, social media management, telecommunications, video game development and international counter-terrorism.------6. WLTY of frequency counter & crystal tester kit circuit & schematicWLTY is a variety hits radio station licensed to Cayce, South Carolina and serves the Columbia, South Carolina market. The iHeartMedia, Inc. outlet is licensed by the Federal Communications Commission (FCC) to broadcast at 96.7MHz with an effective radiated power (ERP) of 9kW. Its studios are in Columbia (west of the Congaree River) and the transmitter is east of downtown Columbia------7. Types of transfusion therapy of frequency counter & crystal tester kit circuit & schematicThere are two main types of transfusion, simple red cell transfusion and exchange transfusion.Simple transfusionInvolves transfusing red blood cells without removing any of the patients blood. It is used when the patient's hemoglobin is much lower than normal, for example an aplastic crisis.Exchange transfusionExchange transfusion involves removal of the patients blood and replacement with donor red blood cells. It is used to treat life-threatening complications of sickle cell disease such as stroke or acute chest crisis.There are three main benefits of an exchange transfusion compared to a simple transfusion, these relate primarily to the ability to remove hemoglobin S containing red blood cells:Higher percentage of normal (donor) hemoglobin (HbA) containing red cells after the transfusionLarger volumes of donor blood can be given without increasing the hematocrit to levels that excessively increase blood viscosityReduced net transfused volume of red blood cells, which reduces iron overload.However, there are also potential risks associated with an exchange transfusion:Red cell alloimmunization due to increased donor exposureHigher costsNeed for specialized equipmentNeed for good venous access.Automated red cell exchangeThe exchange is performed using a machine (pheresis). This method rapidly and substantially reduces the concentration of sickle cells within the blood without increasing the overall hematocrit or blood viscosity.Manual red cell exchangeThe exchange is performed manually. It refers to manually phlebotomizing a percentage of the patients blood prior to or concomitantly with giving a red cell transfusion.Frequency of red cell transfusionsRed cell transfusions can be further classified as episodic or chronic.Episodic transfusionEpisodic transfusion is used either acutely in response to a complication of sickle cell disease such as acute chest syndrome or to prevent complications prior to surgery.Chronic transfusionChronic transfusion is used when sustained, low levels of HbS are needed to prevent sickle cell-related complications, most commonly stroke in children.
What Are the Components of the Underground Pipeline Detector
What Are the Components of the Underground Pipeline Detector
The underground pipeline detector can quickly and accurately detect the location, direction and depth of underground water pipelines, metal pipelines and cables, as well as the location and size of damage points of anti-corrosion coatings of steel pipelines without damaging the ground covering soil. It is one of the necessary instruments for the transformation, maintenance and general survey of underground pipelines in water supply companies, gas companies, railway communications, industrial and mining and infrastructure units. Explain the components of underground pipeline detector 1. High voltage source: used to support discharge; Raise the DC and AC power supply to 3 4KV high voltage, the current is about 20mA high voltage power supply, and the other is 20kHz or 40KHz high frequency power supply. 2. Discharge electrode: send out high-voltage arc to melt the optical fiber; A pair of electrodes * * in a 30 degree conical shape are processed from gold tungsten rods and installed on the electrode frame. The electrode * * spacing is generally 0.7mm; When the high-voltage source is connected, an arc will be generated to fuse the optical fiber at the center of the arc. The service life of the electrode is generally 4000 times. If the electrode is consumed excessively and continues to be used, the connection loss will be increased. Underground pipeline detector 3. Optical fiber regulating device: used to align the optical fiber; The fine adjustment of the V-groove is realized by a spiral micrometer installed at the end of the long benchmark. The optical fiber placed in the v-lane slot is fixed by the mechanical pressing plate. The fine adjustment of the X and Y directions and the Z axis of the optical fiber are orthogonal to each other. The fine adjustment range is more than ± 10um and the adjustment accuracy is ± 0.1mm. Slide rail of optical fiber welding machine 4. Controller: system algorithm processing; It includes telepresence unit and microprocessor, which is used to complete automatic adjustment, pre fusion, fusion and connection loss estimation. 5. Microscope (optical system): used to help observe the state of optical fiber and welding quality. 6. Underground pipeline detector heater (heat furnace): it is used to heat shrink the heat shrink pipe and increase the strength of optical fiber connection.
Detection Method of Power Cable Fault
Detection Method of Power Cable Fault
1. Rough measurement of power cable fault (1) bridge method bridge method is a classical method of power cable fault location, which has a long history. Including DC resistance bridge method, DC high voltage resistance bridge method and capacitance bridge method. The resistance bridge method can only test some cable faults with low insulation resistance between single phase and ground or between two phases; High voltage bridge method is mainly used to test single-phase grounding fault or phase to phase and ground fault of main insulation with resistance greater than 10k Ω but less than megohm; The capacitance bridge method is mainly used to test the open circuit and broken wire fault of cables. The bridge method is relatively simple and convenient to operate, but it needs to know the original data such as the accurate length of the cable in advance. At the same time, it is not suitable for detecting high resistance faults. Most of the actual power cable faults are high resistance faults. Because the bridge current is very small when the fault resistance is very high, it is difficult for general sensitive instruments to detect. (2) Traveling wave method 1) low voltage pulse method low voltage pulse method is mainly used to measure the fault distance of open circuit, short circuit and low resistance faults of cables; At the same time, it can also be used to measure the cable length, wave velocity and identify and locate the middle head, T-joint and terminal head of the cable. Test principle: input a low-voltage pulse signal from the test end to the cable, and the pulse signal propagates along the cable. When encountering the impedance mismatch point in the cable, such as open circuit point, short circuit point, low resistance fault point, etc., a reflected pulse will be generated. The position of the fault point is calculated according to the round-trip time difference DT between the reflected pulse and the transmitted pulse and the pulse propagation speed v. 2) High voltage pulse method high voltage pulse method uses high voltage signal to turn cable fault into short circuit or low resistance fault instantly, so that the reflection coefficient of fault point is close to - 1, and the fault point almost produces total reflection. There are usually two basic flashover methods, namely direct flashover method and impulse flashover method. When testing cable fault by flashover method, the reflected wave formed at the cable fault point is high-voltage pulse wave, which cannot be displayed directly through the instrument. Generally, a sampler is needed to convert the high-voltage pulse formed at the fault point under the action of high voltage into the low-voltage pulse signal required by the instrument. According to different sampling methods, it is divided into voltage method, current method and voltage induction method. Wherein, R1 is the voltage dividing resistance, R2 is the sampling resistance, LP is the current sampler, C is the energy storage capacitor and B is the transformer. DC high voltage flashover method (direct flashover method): apply DC voltage to the fault cable to make the fault click through the room for discharge and flashover. Then, the fault distance can be calculated according to the transmission speed V of the traveling wave in the cable. The direct flash method is mainly used to test the flashover high resistance fault of power cable, and can also be used to test the leakage high resistance fault with particularly high resistance but lower resistance compared with the intact phase. Figure 6 shows the principle circuit of direct flash test. Impulse high voltage flashover method (impulse flashover method): due to the large equivalent internal resistance of DC high voltage power supply used in direct flashover method, the power output power is limited to a certain extent. For most leakage high resistance faults, direct flashover method cannot be tested. The impulse flashover method uses the high-capacity charging capacitor as the DC high-voltage power supply, which is connected to the fault cable to cause the flashover and discharge at the fault point to form an instantaneous short circuit. It is mainly used to test the leakage high resistance fault of power cable, and can also be used to test the low resistance, open circuit and flashover high resistance fault of power cable. The test principle circuit is basically the same as that of the direct flash method, except that a spherical gap is inserted between the energy storage capacitor and the cable, as shown in Figure 7. 2. Precise measurement of power cable fault point (1) acoustic measurement method uses the sound wave generated when the fault point is discharged for fixed point. The sound sensor detects the sound signal above the power cable. The place with loud sound is the location of the fault point. The farther away from the fault point, the smaller the vibration sound. (2) When the fault point flashover discharges under the action of impulse voltage, the acoustic magnetic synchronization method receives the electromagnetic wave and vibration sound wave generated by the discharge of the fault point at the same time, and judges whether the measured signal is generated by the discharge of the fault point to accurately judge the location of the fault point. (3) The audio induction method adds a certain power low-voltage audio signal to the fault of the cable at one end of the tested circuit. When the tested signal is transmitted to the short-circuit or disconnection point, it cannot continue to transmit along the cable, so there will be obvious signal size changes on both sides of the cable fault point. If the signal changes are detected through the receiver above the cable path, The location of the fault point can be determined. At the same time, the accuracy and integrity of various basic data of cables are also very important to improve the efficiency of fault point finding, such as cable laying direction, total cable length, distribution of cable intermediate joints, etc.
Introduction to Underground Pipeline Detector
Introduction to Underground Pipeline Detector
Classification of underground pipeline detectors 1. One category is to detect metal pipelines, electric / optical cables and some non-metallic pipelines with metal marker lines by using the principle of electromagnetic induction. This category is referred to as pipeline detectors for short. Advantages: fast detection speed, simple and intuitive, convenient operation and high sensitivity. Disadvantages: (underground pipeline detector) when detecting non-metallic pipelines, non-metallic probes must be used. This method is laborious and needs to invade the interior of the pipeline. 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: (underground pipeline detector) can detect pipelines of all materials. Disadvantages: high requirements for environment, poor sounding ability (it is difficult to check pipelines with deep buried depth), and high requirements for operator quality and experience. Any instrument is not superior and needs to be used together in order to give full play to their excellence. Traditionally, pipeline detectors only refer to pipeline detectors using the principle of electromagnetic induction, and also use * many instruments. Dear customers: Hello, our company is a high-quality development group with strong technical force to provide users with high-quality products Complete solutions and superior technical service companies. 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!
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