Underground Cable Tracker Buying Guide

Underground Cable Tracker Buying Guide

2021-10-05
NOYAFA
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Characteristics and Principle of Cable Fault Locator
Characteristics and Principle of Cable Fault Locator
Cable fault locator is a comprehensive cable fault detection instrument, which can test the faults such as high resistance flashover fault, high and low resistance grounding, short circuit, cable disconnection and poor contact. The cable fault locator is equipped with an acoustic pointing instrument, which can be used to accurately determine the * * position of the fault point. It is especially suitable for testing power cables and communication cables of various models and different levels of voltage. Adopt a variety of detection methods and apply contemporary * advanced electronic technology achievements. Using computer technology and microelectronics technology, it has the characteristics of high intelligence, complete functions, wide range of use, accurate test, convenient use and so on. 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 * * position of the cable fault point based on the approximate position 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. Dear customers: the company also has cable fault detector, buried cable fault detector and underground pipeline detector products. You can call the company's service phone through the web page to learn more product details. Perfect service is our pursuit. New and old customers are welcome to buy their favorite products at ease. We will serve you wholeheartedly!
Best Wire Tracker for Finding the Hidden Data on Your Website
Best Wire Tracker for Finding the Hidden Data on Your Website
The introduction of wire trackerThis article is about a new service that provides you tools to understand your audience and the things that they are interested in. This will help you in creating better content for them.Tips for wire trackerThe role of wire tracker in a digital agency is changing from an analyst to a full-time employee.How to use wire tracker?There is a certain amount of power that is still in the hands of the content creators, and this can be obtained through different tools. However, it comes at a cost.The specifications of wire trackerWe want to talk about the topic of tracking.The best way to improve the productivity of a team is to enable them to focus on their core competencies. Even when there are other aspects that can be done at a higher level, it's most important for people from different functions within an organization to collaborate in order for it to work well.This is what makes the 'wire tracker' one of the most popular tools among managers and leaders, who are seeking ways to keep teams together and work together without distractions. It's built according to a high-level architecture, making it easy for any team member or administrator from different departments or divisions within an organization, who has some knowledge in software development or IT infrastructure operations, to implement its features using their own skillset. And it's made withThe product instructions of wire trackerProduct instructions should be written for all of the products that a company sells. The instructions should be clearly written so that customers can understand what they need to do to use the product. They should also be easy to follow as the instructions are meant for various types of users and not just the high paid professionals like salespeople.The application of wire trackerIdentity theft and fraud is one of the biggest threat for online businesses. Therefore, they are trying to use more and more sophisticated methods to protect their customers.
Location Method of High Resistance Damage in Power Cable Line
Location Method of High Resistance Damage in Power Cable Line
In order to preliminarily determine the high resistance damage in power cable lines, the combination method of high voltage reflection method is usually used: pulse arc method and vibration discharge method. In this paper, we will consider the main ideas embedded in these methods and how they work. In addition, we will discuss the equipment to implement these two methods. 1、 Pulse arc method (ARM) is used to determine high resistance damage. The main idea of pulse arc method is to use a special high-voltage pulse generator. For example, in the arc cable generator of power cable, oil first creates conditions for the generation of high resistance defects and causes short-term arc (breakdown). According to the magnitude of the leakage current and the power of the current source, use one of two ways for the generator to act on the cable line: 1. Smoothly charge KL's own capacity (cable) from the generator current source until breakdown occurs. This method can be used if the leakage is so small that the power supply of the high voltage pulse generator is sufficient to charge before breakdown. For defects with serious leakage, this method is not applicable. 2. Charge the built-in capacitor of the generator to the required voltage (not exceeding the test standard), and then discharge the cable instantaneously. In this case, the high-voltage pulse propagates in the cable, which will lead to failure when it reaches the location of the defect. This method can be used to search for defects on cable lines with serious leakage. In both cases, the use of inductors integrated in the generator will delay the arc combustion time. The current pulse from the breakdown (propagating from the defect to the input of the generator) triggers a synchronous circuit that starts the low-voltage sounding through the cable fault locator (also known as the cable fault tester). The physical characteristics of the arc have low resistance, and the detection pulse of the cable fault locator is also reflected from medium and low impedance defects (short circuit). Advantages of pulsed arc method the pulsed arc method (ARM) for determining high resistance damage has several advantages. This is a non-destructive method, because unlike combustion, the impact of high voltage on the cable is short. Unlike combustion, this method will not reduce the cable parameters as a whole, and will not cause new damage where the insulation resistance is still within the normal range. Arm is actually a high-precision method, because the measurement is actually carried out by pulse method. 2、 The vibration discharge method (ice / attenuation) should deal with high resistance damage. The vibration discharge method is used to find damage on a long cable line, or when the pulse damping of the underground cable fault locator is too large for some reason to apply the pulse arc method. The vibratory discharge method allows you to locate most faults that can be detected using the pulsed arc method, but usually reduces accuracy. It should be noted here that the function of the cable is not displayed when operating by the vibration discharge method. Current oscillation discharge method (current fluctuation method, ice) when the wave current method is used, the oscillation circuit is formed by the system: capacitor on the source side - Cable - low transition resistance (or arc) at the defective part. When the method of vibration discharge through current is used, according to the leakage current value and the power of the current source, here, as with the pulse arc method, one of the two methods of exposing the cable to the generator is used: 1. Smoothly charge the CL capacitor from the generator current source until breakdown occurs. This method can be used if the leakage is so small that the power of the current source is sufficient to charge before breakdown. For defects with serious leakage, this method is not applicable. 2. Charge the built-in capacitor of the generator to the required voltage (not exceeding the test standard), and then discharge the cable instantaneously. In this case, the high-voltage pulse propagates in the and reaches the defective part, resulting in breakdown or large discharge current. This method can be used to search for serious defects. The discharge current pulse returned to the source will charge its capacitor, which in turn. The wave reaching the defect may cause a discharge in it again (in this case, its polarity will change), or if a second discharge does not occur, it will reflect with the same polarity and repeat the process again until all the energy of the initial pulse disappears. These vibrations are displayed on the screen of the cable fault locator connected to the cable through the inductive sensor.
Negative Sequence Current and Negative Sequence Voltage Components Appear in Cable Fault Tester
Negative Sequence Current and Negative Sequence Voltage Components Appear in Cable Fault Tester
Relays used in the circuits of relay protection devices and electrical automatic devices are generally made of electromagnetic, inductive, electrodynamic and magnetoelectric principles. In recent years, there have been magnetoelectric devices using rectified current, magnetic relays with saturated inductance coils and electronic relays, and relays using semiconductors are being studied. The purpose of studying and adopting these new principles of relays is to simplify the structure of relays, improve their reliability and improve their parameters. Use indirect methods to indicate that there is a fault or improper working state in the power system. For example, this kind of relay has the ability to react with the generation of gas, the generation of heat, the increase of pressure, etc. The relay protection device must have the function of correctly distinguishing whether the protected element is in normal operation state or has a fault, whether it is a fault in the protection area or a fault outside the protection area. In order to realize this function, the protection device needs to be composed based on the characteristics of changes in electrical physical quantities before and after power system failure. The three-phase / six phase relay protection tester is developed by using Zui new digital technology, high-precision electronic devices, microcomputer system and new structure of line and cable fault tester. It can independently complete the device test in professional fields such as microcomputer protection, relay protection, excitation, measurement, cable fault tester and fault recording. It is widely used in scientific research, production and electrical test sites in electric power, petrochemical, metallurgy, railway, aviation, military and other industries. After power system failure, the main characteristics of power frequency electrical quantity change are: (1) current increase. In case of short circuit, the current on the electrical equipment and transmission line between the fault point and the power supply will increase from the load current to greatly exceed the load current. (2) Voltage drop. In case of phase to phase short circuit and grounding short circuit faults, the phase to phase voltage or phase voltage value of each point of the system decreases, and the closer to the short circuit point, the lower the voltage. (3) The phase angle between current and voltage changes. During normal operation, the phase angle between current and voltage is the power factor angle of load, generally about 20. In case of three-phase short circuit, the phase angle between current and voltage of cable fault tester is determined by the impedance angle of the line, generally 60 85. In case of three-phase short circuit in the opposite direction of protection, the phase angle between current and voltage is 180 (60 85). (4) The measured impedance changes. Measuring impedance is the ratio of voltage and current at the measuring point (protection installation). During normal operation, the measured impedance is load impedance; In case of metal short circuit, the measured impedance changes to line impedance. After fault, the measured impedance decreases significantly and the impedance angle increases. Negative sequence current and negative sequence voltage components appear; In case of single-phase grounding, negative sequence and zero sequence current and voltage components appear. These components do not appear during normal operation. The relay protection of various principles can be formed by using the change of electrical quantity during short-circuit fault.
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.
Take Measures to Prevent Cable Failure
Take Measures to Prevent Cable Failure
According to the cause analysis of insulation, accessories and outer sheath faults, it can be seen that the cable line project is a systematic project. Only by managing the whole process from the aspects of design, construction, operation and maintenance can its safe operation be guaranteed to the greatest extent. (1) From the beginning of the design, the grounding system used by the cable shall be fully understood, and the cable conforming to its voltage level shall be selected to avoid the cable working under long-term overvoltage. The selection of outer sheath shall meet the requirements of service environment and service life. At the same time, the selection of cable sheath protector shall meet the principle that the protector can reliably pass through the grounding current without damage during relative grounding. (2) The selection of cable route shall avoid the influence of external environment such as overheating, corrosion and external force damage on the cable. At the same time, it shall also avoid the influence of internal factors causing overheating due to too concentrated cable laying, resulting in the failure of timely diffusion of heat. In addition, the cable path of double circuit power supply is not recommended to be laid in the pipeline of the same path to prevent simultaneous damage and large-area power failure. (3) Strengthen the selection of cables and cable accessories, manufacturer supervision, arrival acceptance and other work to ensure the quality level of cables and cable accessories. During the on-site inspection, the manufacturer, the construction party, the supervisor and the project competent department shall be present, check one by one according to the packing list, timely record the problems found and put forward rectification suggestions, which shall be signed and approved by many parties. After the inspection, the parts susceptible to moisture shall be sealed in time to prevent moisture from affecting normal use. (4) Strengthen personnel training, conduct necessary business qualification and technical evaluation for cable head fabrication personnel, and work with certificates. In case of two consecutive failures due to manufacturing reasons within the warranty period, the cable head manufacturing qualification shall be cancelled, and it can be re employed only after passing the re training and assessment. (5) Strengthen the acceptance of concealed works and intermediate links in all links of cable engineering, strictly control the quality acceptance, thoroughly rectify the defects and hidden dangers found in the acceptance of civil engineering, electrical and other projects, make various records, and leave photos, films and other materials if necessary. (6) Advanced on-line monitoring technologies such as outer sheath circulation on-line monitoring technology, on-line optical fiber temperature measurement technology and on-line partial discharge detection technology are used to strengthen the real-time on-line operation monitoring of cables, find hidden defects in advance and avoid power failure.
New Technology of Optical Fiber Communication
New Technology of Optical Fiber Communication
1. Concept of WDMWDM (wavelength division multiplexing) technology is a technology that transmits multiple wavelength optical signals in one optical fiber at the same time.The basic principle of optical wavelength division multiplexing (WDM) is that the optical signals of different wavelengths are combined (multiplexed) at the transmitting end and coupled to the same optical fiber on the optical cable line for transmission, and the optical signals of combined wavelengths are separated (demultiplexed) at the receiving end for further processing, and the original signals are recovered and sent to different terminals. Therefore, this technology is called optical wavelength division multiplexing, Referred to as optical wavelength division multiplexing technology.How wide is the bandwidth of optical fiber?As shown in Fig. 7.6, there are two low loss transmission windows in the optical fiber: the wavelength is 1.31 μ m(1.25~1.35 μ m) Window, corresponding bandwidth (| Δ f|=|- Δλ c/ λ 2|, λ and Δλ Are the central wavelength and corresponding band width respectively, C is the speed of light in vacuum) is 17700 GHz; Wavelength 1.55 μ m(1.50~1.60 μ m) The corresponding bandwidth is 12500 GHz.When the two windows are combined, the total bandwidth exceeds 30thz. If the channel frequency interval is 10GHz, ideally, one fiber can accommodate 3000 channels.At present, some optical devices and technologies are not very mature, so it is difficult to realize optical frequency division multiplexing (OFDM) with dense optical channels. In this case, wavelength division multiplexing with small channel spacing in the same window is called dense wavelength division multiplexing (DWDM).At present, the system is an optical communication system composed of 8, 16 or more wavelengths on a pair of optical fibers (single optical fiber can also be used) in the 1550nm wavelength range, in which the spacing between each wavelength is 1.6nm, 0.8nm or less, which corresponds to the band width of 200ghz, 100GHz or narrower.WDM, DWDM and OFDM are not much different in essenceIn the past, technicians used to use WDM and DWDM to distinguish between 1310 / 1550nm simple multiplexing and 1550nm intensive multiplexing, but at present, DWDM technology is used in telecom applications.Since the multiplexing of 1310 / 1550nm exceeds the gain range of EDFA and is only used in some special occasions, WDM is often used to replace DWDM.WDM technology is of great significance for network upgrading, developing broadband services (such as CATV, HDTV and IP over WDM), fully tapping the potential of optical fiber bandwidth and realizing ultra-high speed optical fiber communication. Especially WDM and EDFA have a strong attraction to modern information network.At present, "erbium doped fiber amplifier (EDFA) dense wavelength division multiplexing (WDM) non-zero dispersion optical fiber (NZDSF, i.e. G.655 fiber) photonic integration (PIC)" is becoming the main technical direction of long-distance high-speed optical fiber communication lines in the world.If all optical fiber transmission links in an area are upgraded to WDM transmission, we can set an optical cross connection device (OXC) for cross connection of optical signals in wavelength units or an optical add drop multiplexer (OADM) for optical uplink and downlink at the intersection (node) of these WDM links, and a new optical layer will be formed on the physical layer originally composed of optical fiber links.In this optical layer, the wavelength channels in adjacent optical fiber links can be connected to form an optical path across multiple OXC and OADM to complete end-to-end information transmission, and this optical path can be flexibly and dynamically established and released according to needs, which is the eye-catching and new generation WDM all-optical network.2. Basic form of WDM systemOptical wavelength division multiplexer and demultiplexer are the key components of WDM technology. The device that combines signals of different wavelengths and outputs them through an optical fiber is called multiplexer (also known as multiplexer).On the contrary, the device that decomposes the multi wavelength signal sent by the same transmission fiber into each wavelength and outputs it respectively is called demultiplexer (also known as demultiplexer).In principle, this device is reciprocal (bidirectional reversible), that is, as long as the output and input of the demultiplexer are used in reverse, it is a multiplexer.Therefore, the multiplexer and demultiplexer are the same (unless there are special requirements).The basic composition of WDM system mainly includes the following two forms: dual fiber unidirectional transmission and single fiber bidirectional transmission.(1) Dual fiber unidirectional transmission.Unidirectional WDM transmission means that all optical paths are transmitted in the same direction on one optical fiber at the same time.As shown in Figure 7.7, dimmed signals with different wavelengths containing various information will be sent at the transmitter λ 1, λ 2,…, λ N is combined by optical multiplexers and transmitted unidirectionally in one optical fiber.Since the signals are carried through different light wavelengths, they will not be confused with each other.At the receiving end, signals of different wavelengths are separated by optical demultiplexer to complete the task of multi-channel optical signal transmission.The principle of transmission through another optical fiber in the opposite direction is the same.(2) Single fiber bidirectional transmission. Bidirectional WDM transmission means that the optical path transmits to two different directions on one optical fiber at the same time. As shown in Figure 7.8, the wavelengths used are separated from each other to realize bidirectional full duplex communication.Several key system factors must be considered in the design and application of bidirectional WDM system:For example, in order to suppress multi-channel interference (MPI), we must pay attention to the influence of light reflection, isolation between bidirectional paths, type and value of crosstalk, power level value and mutual dependence of two-way transmission, optical monitoring channel (OSC) transmission and automatic power shutdown, and use bidirectional fiber amplifier at the same time.Therefore, the development and application of bidirectional WDM system are relatively demanding, but compared with unidirectional WDM system, bidirectional WDM system can reduce the number of optical fibers and line amplifiers.In addition, by setting an optical add drop multiplexer (OADM) or optical cross connector (OXC) in the middle, the optical signals of each wavelength can be merged and shunted, and the wavelength add / drop and route allocation can be realized. In this way, the inserted or separated signals can be reasonably arranged according to the traffic distribution of optical fiber communication lines and optical networks.3. Performance parameters of optical wavelength division multiplexerOptical wavelength division multiplexer is an important part of wavelength division multiplexing system. In order to ensure the performance of wavelength division multiplexing system, the basic requirements for wavelength division multiplexer are:• low insertion loss• high isolation• flat in band and steep out of band insertion loss• good temperature stability• multiple channels• small size, etc(1) Insertion loss insertion loss refers to the additional loss caused by the addition of optical wavelength division multiplexer / demultiplexer, which is defined as the ratio of optical power between the input and output ports of the passive device, i.e(7.1)Where Pi is the optical power sent into the input port; Po is the optical power received from the output port.(2) Crosstalk suppression system crosstalk refers to the influence degree that the signals of other channels are coupled into a channel and degrade the transmission quality of the channel. Sometimes, this degree can also be expressed by isolation. For demultiplexer(7.2)Where Pi is the wavelength λ I is the input optical power of the optical signal, and PIJ is the wavelength λ The optical signal of I is connected in series to the wavelength of λ Optical power of channel J.(3) Return loss return loss refers to the ratio of the optical power returned from the input port of the passive device to the input optical power, i.e(7.3)Where PJ is the optical power sent into the input port, and PR is the return optical power received from the same input port.(4) Reflection coefficient reflection coefficient refers to the ratio of reflected light power PR to incident light power PJ at a given port of WDM device, i.e(7.4)(5) Working wavelength range working wavelength range refers to the wavelength range in which WDM devices can work according to the specified performance requirements( λ Min to λ max)。(6) Channel width channel width refers to the wavelength interval between light sources to avoid crosstalk.(7) Polarization dependent loss (PDL) refers to the maximum change of insertion loss caused by the change of polarization state.
How to Fix the Infamous Nook Color / Nook Tablet Charging USB Cable for Good?
How to Fix the Infamous Nook Color / Nook Tablet Charging USB Cable for Good?
I did a better fix-- I opened up my Nook and replaced the connector on the PC board with a conventional micro USB connector. I now can use any standard micro USB (even the cheap retractable kind! Another option if you are not comfortable performing surgery on your Nook is the eForCity Micro USB OTG to USB 2.0 Adapter/dongle available from Best Buy. It will allow you to use a standard full-size USB cable of any length to charge your Nook without worrying about bending and trashing your straight nook charging cable. Linky: bestbuy.com/site/eforcity-micro-usb-otg-to-usb-2-0-adapter-compatible-with-samsung-galaxy-s3-black-black/1304921534.p?idmp1304921534&skuId1304921534The Barnes&Noble Nook Color / Nook Tablet have a proprietary micro USB charging port which is longer than normal and allows power charging with 2Amps.The charging/data cable from BN is infamous to break after some time, most probably the cable's primary plastic coating is not very flexible and starts to split at the point where it enters the micro usb connector and leads to a visible secondary shielding. If nothing is done the situation worsens and in the end the internal power cables may short.I got my used B&N Nook Color with a beginning coating split and cannot get a replacement from B&N because I live outside the US and have no invoice.Seems like this problem is a common one, there are already discussions about a class action lawsuit.What can I do besides looking for a replacement?·OTHER ANSWER:The Barnes&Noble Nook Color / Nook Tablet have a proprietary micro USB charging port which is longer than normal and allows power charging with 2Amps.The charging/data cable from BN is infamous to break after some time, most probably the cable's primary plastic coating is not very flexible and starts to split at the point where it enters the micro usb connector and leads to a visible secondary shielding. If nothing is done the situation worsens and in the end the internal power cables may short.I got my used B&N Nook Color with a beginning coating split and cannot get a replacement from B&N because I live outside the US and have no invoice.Seems like this problem is a common one, there are already discussions about a class action lawsuit.What can I do besides looking for a replacement?
Overview of Cable Fault Locator
Overview of Cable Fault Locator
Overview of cable fault locator cable fault locator is a comprehensive cable fault detection instrument. It can test the faults such as high resistance flashover fault, high and low resistance grounding, short circuit, cable disconnection, poor contact and so on. The cable fault locator is equipped with an acoustic pointing instrument, which can be used to accurately determine the * * position of the fault point. It is especially suitable for testing power cables and communication cables of various models and different levels of voltage. Detection mode the cable fault locator adopts a variety of detection modes and applies contemporary * advanced electronic technology achievements. Using computer technology and microelectronics technology, it has the characteristics of high intelligence, complete functions, wide range of use, accurate test, convenient use and so on. The design of locator to detect aircraft cable fault is very important in civil aviation maintenance; According to the characteristics of aircraft cable, a method that can effectively test and diagnose it, low voltage pulse method, is proposed, and an aircraft cable defect detection and positioning device is designed by using single chip microcomputer and CPLD technology; The positioning instrument is mainly composed of three parts: signal acquisition circuit, system control circuit and human-computer interaction circuit; At the same time, two sets of product vibration are adopted, which not only ensures the high-speed signal acquisition, but also meets the low-speed processing of the system. It has the characteristics of low cost, portability and dexterity, accurate test and so on; At the same time, in addition to being applied to aircraft cable maintenance, it can also be further applied to short-distance cable testing and defect detection in telecommunications, power and other departments. Dear customers, the company also has cable recognizer, cable tie tester and underground pipeline detector products. You can call the company's service phone through the website to learn more about the details of the products, Perfect and beautiful service is our pursuit. Welcome new and old customers to buy their favorite products at ease. We will serve you wholeheartedly!
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