What Is Led Voltage Tester?

What Is Led Voltage Tester?

2021-10-23
NOYAFA
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The goal of SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED is to provide led voltage tester with high performance. We have been committed to this goal for over years through continuous process improvement. We have been improving the process with the aim of achieving zero defects, which caters to the customers' requirements and we have been updating the technology to ensure the best performance of this product.The success of NOYAFA is possible due to our commitment to producing high quality products for all price ranges and we have offered a broad range of features and benefits in products to provide more choices for our customers. This commitment has resulted in high approval ratings and repeat purchases of our products while gaining a good reputation at home and abroad.At Best Cable Tester Supplier in China _ Noyafa, customers don't need to worry about the transportation of the products like led voltage tester. By cooperating with reliable logistics companies, we guarantee the goods arrived safely and effectively.
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Best Wire Tracker to Cut, Tame,& Protect Home Wires
Best Wire Tracker to Cut, Tame,& Protect Home Wires
The introduction of wire trackerWire tracker is a robotic and autonomous material handling system that helps to automate the manual process of tying wire bundles. With the help of this machine, wire bundles are automatically wrapped around a bundle wrapping machine to be transported.Wire tracker saves time and manpower by decreasing material handling cost and increasing productivity. It also increases efficiency by automating the manual process of tying wire bundles. This system has many benefits in terms of safety as well as environmental impact.With the introduction of this machine, the automation process improves labor efficiency as well as safety in various applications such as power lines, water lines, solar panels, etc. Wire tracker reduces environmental impact by decreasing fuel consumption and greenhouse gas emissions from forklifts and trucks for transportation purposes.Tips for wire trackerWire trackers are among the most vital part of any electronics assembly or electronics manufacturing. They are responsible for accurately locating and tracking the wires on an electronic device during a production run.Wire tracking is not just about precision and accuracy - it’s also about efficient use of time, so a wire tracker needs to be able to handle multiple tasks at once.In this article, we will highlight some tips for finding the best wire tracking machines for your production facility.For starters, you need to decide what type of wire tracker you want. There are two main types: manual and automatic wire trackers. The former is more precise but it requires more time-consuming set-up while the latter can be adjusted easily from one machine type to another but they require more investments in automation equipmentHow to use wire tracker?Wire trackers are used by wire-tracing artists to work on creating their designs. They use a variety of tools such as wire, pens, paper and cardboard to create artworks.The process is similar to crocheting or weaving one fiber at a time. The artist has to form the wire into different shapes and coils. To start working with the wire, the artist needs to take it out of its packaging and unravel it from its plastic casing. This process is done by pulling it through one’s fingers and wrapping it around the hand until it forms a coil that they can continue working on.The specifications of wire trackerWire trackers are a tool used in the wire trade to ensure that items are accurately transported and separated. They work by allowing items to pass through a narrow slot without getting stuck.Wire trackers come in various shapes and sizes, but all of them are made from steel with a smooth-walled interior. The surface of them is not very rough, which makes it difficult to hook or grab the item by mistake.Wire trackers have many uses across the different industries. They can be found at airports, factories, warehouses, shopping malls, libraries and other places where valuable goods need safe transport.The product instructions of wire trackerWire trackers are the most widely used DIY tool in home improvement projects. They are used to hold wires, pipes, and cables.The instructions for using wire trackers are simple - however there is still an overwhelming number of problems that people have with them. It is important for manufacturers to make sure that their product instructions are easy to understand and don't include any spelling mistakes or grammatical mistakes.This section discusses how product instructions can be improved by AI writing assistants so that they can become more effective in improving the user experience.The application of wire trackerWire tracking is the process by which a wire is used to measure the progress of a drill.Wire tracking systems enable drill operators to easily and quickly set up their own equipment and work, keeping them safe. It also ensures greater efficiency and accuracy with each drilling job.Wire tracking allows for an increased level of control over drilling operations, which makes it perfect for high-quality production jobs where quality control is important
This Paper Briefly Introduces the Fault Detection Method of High Voltage Cable
This Paper Briefly Introduces the Fault Detection Method of High Voltage Cable
The discovery and fixed-point work of cable faults has always been a big problem in the electrical measurement industry, mainly because most cables are deeply buried underground, the laying distance ranges from a few meters to a few kilometers, and the on-site environment is complex. In addition to the high quality requirements for cable fault test equipment, the comprehensive quality of technicians is also very strict. There are three common types of cable faults: low resistance fault, high resistance short circuit grounding fault and flashover fault. For different types of cable faults, the fault point detection methods are also very different. The following is a brief introduction to the fault detection method of high-voltage cable. There are two kinds of traditional fault detection methods for high voltage cables: bridge method and pulse method. 1、 Electric bridge method is a classical method for ranging power cables. This method is relatively simple, but it needs to know the data such as cable length in advance, and it is only suitable for low resistance and short circuit faults. However, in actual operation, faults are often high resistance and flashover faults. Due to the high fault resistance, the bridge current is very small, so it is difficult for general sensitivity instruments to detect. 2、 Pulse method 1. Pulse current method this method is safe, reliable and simple. The method is to break down the cable fault point with high voltage, collect and record the current traveling wave signal generated by the fault click through with the instrument, and calculate the fault distance according to the round trip time between the current traveling wave signal at the measuring end and the fault point. In this method, the pulse current is coupled with a transformer, and the waveform is simple and safe. This method also includes direct flash method and impulse flash method. Different from the pulse voltage method, which uses resistance and capacitor voltage dividers for voltage sampling, the pulse current method uses linear current couplers placed parallel to the low-voltage geodesic and has no direct electrical connection with the high-voltage circuit. It is particularly safe and convenient for recording instruments and operators. So people usually use this method. 2. Pulse voltage method this method can be used to measure high resistance 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. An important advantage of pulse voltage method is that it does not have to burn through high resistance and flashover faults. It directly uses the instantaneous pulse signal generated by fault breakdown. The test speed is fast and the measurement process is simplified. 3. For low resistance and open circuit faults, the pulse echo method uses the low-voltage pulse reflection method to measure cable faults. Compared with the above bridge method, it is simple and direct. It only needs to observe the time difference between the reflection and transmission pulses at the fault point to locate the fault. During the test, a low-voltage pulse is injected into the cable. When the pulse propagates to the fault point, it will be reflected, and the pulse is reflected and sent back to the measuring point. The time difference between the transmitted and reflected pulses is recorded by the instrument, and the distance of the fault point can be calculated only by knowing the pulse propagation speed. This method is simple and intuitive. It does not need to know the original data such as cable length. It can also identify the position of cable joint and branch point according to the reflected waveform.
Composition of Cable Fault Tester
Composition of Cable Fault Tester
Composition of cable fault tester: the cable fault tester can test the high resistance flashover fault, high and low resistance grounding, short circuit, cable disconnection, poor contact and other faults of the cable. If equipped with an acoustic point tester, it can 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. System composition 1. Host of cable fault tester 2. Cable path and fault locator 3. Cable fault integrated high voltage generator 4. Cable identifier 5. High voltage cable safety pricker 6. High voltage equipment: current sampler, cable fault integrated high voltage generator, pulse capacitor, complete set of special test lines, etc. Cable fault tester is a set of comprehensive equipment. It is used to test the open circuit, short circuit, grounding, low resistance, high resistance flashover and high resistance leakage faults of power cables, as well as the open circuit and short circuit faults of coaxial communication cables and local telephone cables. It can also test the cable path, buried depth, radio wave velocity, verify the cable length, and establish cable files for daily maintenance and management. The instrument adopts a variety of detection methods, computer technology and microelectronic technology. It has the characteristics of high intelligence, complete functions, wide range of use, accurate test and convenient use.
What Problems Will Be Encountered in the Use of Underground Pipeline Detector
What Problems Will Be Encountered in the Use of Underground Pipeline Detector
As a new type of intelligent stethoscope, underground pipeline detector is used to survey underground pipelines. It is composed of transmitter, receiver and accessories. It is mainly used for underground pipeline positioning, buried depth measurement and long-distance tracking, as well as pipeline insulation fault point measurement and search. The equipment adopts multi coil electromagnetic technology, which greatly improves its depth determination accuracy and target pipeline identification ability. It can accurately track and locate the target pipeline even in the area with dense and complex pipelines. However, due to the complexity and diversity of underground pipelines, a better method is to combine various technical methods for general survey. The common site conditions in the operation of underground pipeline detector are as follows: 1. Track from the joint or handover box. Before the cable applies the transmitter signal, the common connector on the cable needs to be removed to track the target pipe. If all cables are to be tracked from the junction box, the transmitter can work in an inductive manner, placed on one side of the junction box and in line with the cable to be tracked. 2. Long distance tracking cable. In order for the transmitter signal to transmit a sufficient distance, it is necessary to remove the grounding connection of the cable. When the joint or joint is grounded for safety or lightning protection, surge arrester (anti overload) can be used to replace the grounding of the joint or joint, so as to protect the cable and make uninterrupted positioning possible. 3. Is the connector spike. Most cable connectors or connectors will generate spike pulse when the receiver responds. Working experience and understanding the local situation will help the operator to judge whether the spike pulse indicates that there is a connector box. 4. It's a metal guardrail. The cable is usually buried directly under the road outside the road metal guardrail, and the signal is combined with the continuous metal guardrail. The metal guardrail is close to the antenna at the lower part of the receiver, which is difficult to track. When it comes to the receiver, this difficulty can be overcome by making the internal antenna at the lower end flat with the metal guardrail. 5. Street lighting. Generally, the metal column of street lamp and the metal shielding layer of lighting cable are connected with the metal column. At this time, the transmitter signal can be connected to the metal column of street lamp. If the cement lamp post - unless the lighting cable can be connected to the maintenance rack and grounded, the transmitter signal needs to be connected to the metal shielding of the lighting cable. Knowing the relevant location and depth of lighting cables (and other street facilities on the same lighting system) can help track lighting cables. A connection point may apply signals to a large area of cables. It is also feasible to use street lamp posts to apply signals to other power cables, but the signal may be weak because the signal may have been transmitted for a long distance before returning to the substation and can flow out of the system again. At this time, the transmitter can increase the output power mode and increase the output power. This method can locate cables that are difficult to apply signals or inconvenient. For cables coming down from wooden poles, cement poles or lighting columns, the transmitter can be placed in sensing mode to apply a signal by making a right angle to the ground on the pole.
In Case of These Six Cable Faults, It's Right to Choose It for Detection
In Case of These Six Cable Faults, It's Right to Choose It for Detection
With the characteristics of faster inspection speed and high precision of cable fault detector (also known as cable fault detector, cable fault locator and cable fault tester), it has won the favor of many customers. Many powerful enterprises will purchase a set of cable fault detector equipment to ensure the smooth operation of cables in the industrial zone. For equipment with these 6 kinds of cable faults, please choose this cost-effective cable fault tester. 1. Low resistance fault, cable insulation material is damaged and grounding fault occurs. 2. In case of open circuit fault, the continuity of the metal part of the cable is damaged, resulting in wire breakage, and the insulating material at the fault point is also damaged to varying degrees. 3. High resistance fault, cable insulation material is damaged and grounding fault occurs. 4. Flashover fault: the insulating material of the cable is damaged, resulting in flashover fault. 5. Breakdown fault: in actual work, the cable insulation damage event triggered by preventive test is commonly referred to as cable breakdown. 6. Operation fault refers to the cable fault determined by eliminating the possibility of faults of other power elements when voltage fluctuation occurs in the high-voltage secondary circuit of cable feeders, motor and transformer during the operation of plant power system or grounding signal is found (grounding tripping occurs in power elements with grounding protection).
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.
Does the LG Dare Come with a USB Data Cable Cord?
Does the LG Dare Come with a USB Data Cable Cord?
i think it does i would just go to the place where u got it from and tell them what happened theyll be glad to get you another one1. how USB data cable used for transferring data from cellphone to the memory of the computer?Well you will need to connect the cellphone to the computer through the USB cable provided with the cellphone and install the software that will make the computer recognise the cellphone, otherwise connecting the cellphone via the USB cable alone will not work (except maybe the cell phone has the relevant bios in the operating system you have running on your computer). It is this software contained in the installation CD that comes with your cellphone, that contains the required suites that allows you to download/transfer datafrom the cellphone to your computer. All you ned do after proper installation is to connect the part of the USB cable to the port indicated on your cellphone (you will get this from your phone manual) and then the other part to the USB port on your computer.2. What Website Is More Reliable, For a LG Electronics USB Data Cable for LG EnV2 VX9100?a good one is PENisland.com3. what are the best deals on wireless cell, wireless data, cable and internet service right now?AT&T is bout the only one that does that forreal everybody else has somethin missin (Sprint, Verizon, and TMobile) unless you do cell service with one company and do everything else with somebody else4. Data cable for cell phone helpppp!!!?maybe ur system not support or software not support so,go to lg chocolate home page and download ur correct driver and ur pc suite software.the sofware is free.download ur sofware manually in ur phone site.......... if u think ur sofware and ur sytem requirement is correct try to connect using bluetooth or infra red5. From where i can download LG B2050 USB Data Cable Driver?Try looking here6. which is better? nokia N75 or N76? or is there any other fold phone from nokis is good?Nokia's are pretty good phones. A lot of different styles with functions and features. Nokia N75 (Multimedia Phone) The fantastic Nokia N75 for AT&T is a phenomenally capable "next generation" phone. The Nokia N75 lets you enjoy streaming AT&T TV and Radio, or surf the Web or email at near-broadband download speed. Plus, the Nokia N75 has Bluetooth, a built-in music player and FM stereo with great sound, a 2.0 Megapixel camera/camcorder, and an expandable memory card slot. With all this in a thin, eye-catching shell, you may find that your Nokia N75 spends more time in your hand than in your pocket Highlights Super-loaded Entertainment Phone With High-speed Data Download Capability Watch Streaming AT&T TV, or Listen To Streaming Radio Bluetooth Wireless Technology Built-in Music Player and FM Stereo Radio With Equalizer And Stereo Speakers 2.0 Megapixel Digital Camera Takes Print-quality Stills Record Extra-long And High-quality Video Clips Expandable Memory Card To Store Your Songs, Pictures and Videos What is In The Box With The Phone Additional Items Included - Battery, Data Cable, Charger, User Guide Advanced Features Digital Camera - 2.0 Megapixels (1600 x 1200 Pixel Resolution Max), 4x Digital Zoom, LED Flash, PictBridge Software Streaming Multimedia Support - Yes, Enjoy Streaming AT&T TV With HBO Or AT&T Music With MTV, XM and Yahoo! Your more then welcome to them. Feel free to email me at7. Soldering a SATA-Data cable to a HDDActually, there's only 4 pins that matter You have 4 wires for signal, 2 per 'channel' and 3 grounds (which should be tied together anyway). The 4 bare wires on the outside of each pair/channel are ground, and any three should work.You absolutely do not want to do this without a multimeter. That said, I strongly recommend plugging one end into a switched off PC or drive and checking continuity between all 4 ground wires (on the outside) and checking each pin and its corresponding wire to ensure you know which wire is which. If you do not have a multimeter, you ought to get one and learn the basics of using it - continuity testing is about the simplest function in one. I am also not sure if trace lengths matter here, and that may be an issue. Not sure how to deal with that considering everything I've seen in the question though
What Are the High Voltage Test Transformers_ Use of High Voltage Test Transformer
What Are the High Voltage Test Transformers_ Use of High Voltage Test Transformer
What is a high voltage test transformerHigh voltage tester refers to a kind of transformer that generates high voltage for high voltage test. High voltage test transformer has the characteristics of high voltage, small capacity, short continuous working time, thick insulation layer and usually one end of high voltage winding is grounded.High voltage test transformer is called test transformer for short. The test transformer is generally a step-up transformer. The test transformer uses the power frequency high voltage induced by the secondary side to test the insulation performance of various electrical products and insulating materials. Test transformer is an indispensable electrical equipment for withstand voltage test in the repair of motor, transformer and electrical products. The test transformer is mainly used for power frequency withstand voltage test of electrical products, partial discharge measurement, thermal stability test of insulating medium, etc; For medium and high frequency electrical equipment, special frequency test transformers can also be used for withstand voltage test and measurement of relevant electrical parameters.The primary and secondary windings of the test transformer have a large voltage ratio. The primary voltage is 0.4kV, 3KV, 6kV and 10kV. The secondary voltage can be made into 100 2000kv or higher, and the capacity can be 3 9000kva. For the field test of power equipment, the light test transformer is generally used; 50kV step-up test transformer is used for withstand voltage test of 6kV, 10kV transformers and other power equipment; For the withstand voltage test of high voltage, ultra-high voltage transformers and other power equipment with voltage level above 35kV, ultra-high voltage test transformers greater than 5 times the primary rated voltage of the tested equipment, such as step-up test transformers of 500kV, 700kv, 800kV and certain capacity level.Characteristics of high voltage test transformer1) High voltage: the primary voltage of the test transformer is 220V or 380V, but the secondary voltage of a single test transformer often reaches thousands to tens of thousands of volts. The test transformer with secondary voltage exceeding 750kV usually adopts multiple cascade structures.2) Small current: the rated current of the test transformer is actually the capacitive current of the tested object, so it is generally less than 1a. However, the secondary current of the test transformer used for cable and large motor test, external insulation pollution test, line corona test and other projects can reach several amps.3) Short working time: due to the short withstand voltage time of the tested product, the test transformer is generally 0.5h or 1H short-time working system except for external insulation pollution test, line corona test and cable test.4) The test transformers are generally single-phase and indoor devices (some are also made into outdoor devices): they are oil immersed self cooling structure, the winding insulation layer is thick, and one end of the high-voltage winding is usually grounded.5) The insulation level of the head and end of the secondary winding of the test transformer is different: the head end is high potential, and the end is directly grounded or grounded through an ammeter.6) High requirements for design and manufacturing process: due to the high working voltage, the insulation structure has a decisive impact on the overall size of the test transformer. Vacuum drying is generally required for the body, and vacuum oil injection is required for above 100kV.Classification of high voltage test transformers1) In terms of structure, there are iron shell type and insulated shell type test transformers.2) In terms of power frequency, there are several frequency level test transformers such as power frequency, frequency doubling, intermediate frequency and high frequency.3) According to the voltage level, it can be divided into low voltage, high voltage and ultra-high voltage test transformers.4) According to the use form, it can be divided into light mobile type and fixed type; There are also single use and two or more cascade use test transformers.The test transformer is generally single-phase and indoor devices, which are oil immersed self cooling structure. Because of its high working voltage, its winding insulation layer is thick, and one end of the high-voltage winding is grounded.The specific structural types of the test transformer generally include single bushing type, double bushing type and insulating cylinder type.Technical requirements for high voltage test transformer①Output voltage waveform. The output voltage waveform of the test transformer shall be close to the sine wave as far as possible. In order to reduce the voltage waveform distortion caused by the harmonic voltage generated by the harmonic component of no-load current passing through the impedance of voltage regulator and transformer, the magnetic flux density should be selected in the straight line section of core magnetization curve; At the same time, voltage regulating equipment with small waveform distortion shall be selected, and filter device can be added if necessary.② Impedance voltage. The secondary current of the test transformer is generally capacitive current. When the secondary current flows through the impedance of the voltage regulator and the test transformer, the output voltage will exceed the value determined by the voltage ratio. Therefore, the impedance voltage of the test transformer should not be too large, otherwise it may affect the accuracy of the test results and reduce the short-circuit capacity of the test equipment. However, if the impedance voltage is too small, the short-circuit current may increase when the test object breaks down or flashover. The impedance voltage of a single test transformer is generally 4.5 10%, and when multiple series transformers are formed, it can reach 30 40%.What are the high voltage test transformers1) DJ oil immersed high voltage test transformerOil immersed test transformer: large volume, heavy weight, large capacity, convenient maintenance and high maintenance cost in the later stage; Mainstream products.The oil immersed type is filled with 25# transformer oil, and the insulation cooling effect is the best2) GTB dry type high voltage test transformerDry type test transformer: maintenance free, light weight, small volume, inverted and high cost.3) Inflatable high voltage test transformerInflatable test transformer: it needs later maintenance, with good arc extinguishing performance, light weight and danger.The oil immersed type is filled with 25# transformer oil, and the insulation cooling effect is the best; Dry type has small volume and lightest weight, but the voltage is difficult to be high; The inflatable type is filled with SF6 gas.Application and operation method of AC / DC high voltage test transformerDuring the step-up or withstand voltage test of AC / DC high-voltage test transformer, if the following unusual conditions are found, the voltage shall be reduced immediately and the power supply shall be cut off. As of the experiment, the reasons have been found out: ①the pointer of the voltmeter swings greatly; ② The insulation of the invention burns or smokes; ③ There is unusual sound in the test object.Utilization and operation methods of AC / DC high voltage experimental transformer:1. Connect the power supply of the control box (console) and turn on the indicator light.2. Press the start button and the operation indicator light is on (otherwise, the voltage regulator is not in the zero position, please rotate the hand wheel of the voltage regulator to the zero position counterclockwise) indicating that the experimental operation can be stopped.3. Move the hand wheel of the voltage regulator clockwise to make the conditioning rate 2KV / s better, and watch the high-voltage meter rise to the required voltage value. For example, in the process of boosting, when the test object breaks down, short circuit and overcurrent occurs, the overcurrent relay acts to automatically cut off the power supply.4. If the experiment requests overcurrent control, adjust the overcurrent relay to the power supply current value required by the experiment in advance before operation, and the current relay will stop overcurrent protection according to the experiment request.5. While monitoring the high-voltage meter, an external 0.5-level voltmeter can be accepted at the instrument end for monitoring.6. Measure the insulation resistance and check the insulation condition before and after the withstand voltage test.
Analysis on Fault Location Mode of Power Cable
Analysis on Fault Location Mode of Power Cable
Cable faults also occur in the process of cable laying. Due to different cable laying methods, the difficulty of cable fault location increases gradually. Among them, the positioning of bridge, tunnel and groove is relatively simple, and the direct buried positioning is relatively difficult. Generally, a special cable fault location device (also known as cable fault tester) is used, which can be located in dozens of minutes, Special faults often take 4-5 days or even longer to locate. Now let's analyze the fault location mode of power cable. When using echo method to locate power cable fault, sometimes by transferring fault phase and wiring mode, complex fault will often be transformed into simple fault to quickly determine fault location. It is of great significance for the power supply user department to win time for the emergency repair of on-site lines. Low voltage power cables are generally multi-core cables. When faults occur in continuous use after laying, 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 one 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 section copper core directly buried power cable (35mm2 and below) and aluminum core cable may be accompanied by short circuit and wire breakage at the same time. During on-site detection, converting short-circuit fault into broken line 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 insulation core fails, the inner lining may have been damaged. When the cable insulation fault is special and it is difficult to collect the waveform with a professional cable fault tester, the acoustic method can be considered, When the high voltage pulse is directly applied between the steel strip and copper shielding layer of the cable, it will often be fixed quickly. In the field measurement process, we also found that when using the acoustic 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, due to the low resistance metal connection state of the insulation resistance of the two, 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 the site for many times, it is found that the distance between the discharge ball gaps is appropriately increased. At the same time, if the high voltage and grounding wire are connected between the two faulty phases, the discharge sound will become louder and the fault point will be determined quickly.
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