Guide to Buy Power Cable Fault Location in NOYAFA

Guide to Buy Power Cable Fault Location in NOYAFA

2021-11-11
NOYAFA
41

On this page, you can find quality content focused on Power cable fault location. You can also get the latest products and articles that are related to Power cable fault location for free. If you have any questions or want to get more information on Power cable fault location, please feel free to contact us.

The Power cable fault location, as the main contributor to the financial growth of SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED, is highly recognized in the market. Its production technique is a combination of industry knowhow and professional knowledge. This helps greatly in improving the production efficiency, reducing the production cost, and ensuring the production quality. Of course, its performance and application are also guaranteed. This has been certified by authorities and proven by end users already. NOYAFA may be expected to influence a new generation with our highly innovative ideas and modern design concepts. And we own a highly professional R&D engineer team who has done a lot of work to support our progressional science and technology innovation, which is the main reason that our NOYAFA branded products have taken precedence in the buying trend and that they are very popular in the industry now.Having developed for years, we have established a full set of service system. At Best Cable Tester Supplier in China _ Noyafa, we guarantee the products to come with varied styles and specifications, the goods to be delivered on time, and professional after-sales service to be offered.
more products
recommended articles
Info Center News
Power Cable Fault Location Method
Power Cable Fault Location Method
Fault location method of power cable: Aiming at the problem that it is more difficult to determine the fault location of buried power cable than overhead line, this paper selects a representative example of fault location process of 10 kV cable in case of high resistance fault, and introduces the method of locating and locating the fault point by using secondary pulse method according to the fault nature. For the high resistance fault during cable operation, first consult the relevant data of the cable and master the detailed information of the cable; Use multimeter and insulation resistance meter to judge the cable fault type, and determine the corresponding test method according to the fault type; Use the fault tester to test the length of the cable, check whether the test results are consistent with the data, and preliminarily determine the distance of the fault point; Finally, the secondary pulse method is used to accurately locate the fault point, find out the fault point, peel off the cable and find out the cause of the cable fault, so as to take corresponding preventive measures. This method is easy to master, especially for short-distance faults, the test waveform is easier to analyze, and the fault distance can be determined quickly, which makes the cable test more efficient and the fixed-point positioning time shorter. Power cable faults are complex and diverse, which can be divided into open faults and closed faults according to fault surface phenomena; According to the grounding phenomenon, it is divided into grounding fault, phase to phase fault and mixed fault; According to the fault location, it is divided into joint fault and cable body fault; According to the nature of resistance, it is divided into broken line fault, mixed line fault and mixed fault. Among them, mixed line fault is divided into low resistance fault, high resistance fault and flashover fault. 1. Fault detection methods for different cable faults, the common detection methods include low voltage pulse method, pulse current method, secondary pulse method, bridge method, pulse voltage method, etc. [3]. This paper only introduces the three commonly used detection methods. 2. Low voltage pulse method low voltage pulse method is suitable for detecting low resistance fault (short circuit fault with fault resistance less than 200 & omega;) and open circuit fault. It can also be used to measure the length of cable and the propagation speed of electromagnetic wave in cable, and distinguish the middle head, T-joint and terminal head of cable. 3. Pulse current method pulse current method generally includes impulse flash method and direct flash method. The linear current coupler is used to collect the current traveling wave signal in the cable and generate the fault test waveform, so as to judge the fault condition and measure the distance between fault points through the waveform. The direct flash method is used to detect flashover breakdown faults, that is, the resistance at the fault point is very high, and flashover breakdown faults will occur when the voltage is raised to a certain value with high-voltage test equipment. The impulse flashover method is also suitable for testing most flashover faults. Because the waveform of the direct flashover method is relatively simple and it is easy to obtain more accurate results, the direct flashover method should be used as much as possible. 4. Secondary pulse method with the cooperation of high voltage signal generator and secondary pulse signal coupler, the secondary pulse method can be used to measure the fault distance of high resistance and flashover faults. The waveform measured by this method is simpler and easy to identify.
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.
Composition of Street Lamp Cable Fault Tester
Composition of Street Lamp Cable Fault Tester
The street lamp cable fault tester consists of rt-2133 cable fault tester host, rt-2132j cable fault locator and rt-2132f cable path tester. The host of rt-2133 cable fault tester is used to measure the nature of cable fault, the total length of the tested cable and the approximate position between the cable fault point and the test end. Rt-2132j cable fault pointing instrument determines the exact location of cable fault point based on the approximate location of cable fault point determined by the host of cable fault tester. For buried cables with unknown trend, cable Pathfinder shall be used to determine the trend of underground cables. If the specific direction of underground cables is known, cable Pathfinder may not be used. The host of rt-2133 cable fault tester can be directly connected with the notebook computer for easy management and operation. The rt-213x complete set of cable fault test instruments can quickly and accurately find the fault points of various cables. It is suitable for factories and mining enterprises, metallurgy, petrochemical systems, power plants, airports, railways, power supply and other departments. Rt-213x cable fault comprehensive tester is widely used to detect low resistance, short circuit, open circuit and various high resistance faults of aluminum core, copper core power cables, high-frequency coaxial cables and local telephone cables with different sections below 35KV. It is a necessary equipment to ensure safe power supply and a powerful assistant for cable production and maintenance workers. Dear customers: Hello, our company is a high-quality development group with strong technical force, providing users with high-quality products, complete solutions and superior technical services. The main products are high voltage cable fault tester, cable fault tester, underground pipeline detector, etc. The enterprise adheres to the tenet of building a business in good faith, keeping the business with quality and developing the business with enterprising. It continues to climb new peaks with a firmer pace and make contributions to the national automation industry. New and old customers are welcome to buy their favorite products at ease. We will serve you wholeheartedly!
Advantage Analysis of Cable Fault Tester
Advantage Analysis of Cable Fault Tester
With the development of the market, cable fault tester is mainly divided into common and three pulses. What are the advantages and functions of these two kinds? Yuange will explain them to you. [functional advantages of common cable fault tester] 1. It can measure high and low resistance faults of all cables below 35KV, with wide adaptability. 2. It has user-friendly software and full Chinese menu. Key definition is simple and clear. The measurement method is simple and fast. 3. Excellent fault detection success rate, test accuracy and test convenience. As the display terminal, the 4.8-inch color LCD touch screen has strong data processing ability and friendly display interface. 5. Sampling high voltage protection measures are provided. The test instrument will not crash and damage in the impact high-pressure environment. 6. With computer communication interface, it is convenient to save data and graphics in the computer. 7. No test blind area. 8. The built-in power supply can test the open circuit and low resistance short circuit faults of the cable in the environment without power supply. [functional advantages of triple pulse cable fault tester] 1. It can measure high and low resistance faults of all cables of 35kV and below, and has a wide range of adaptability. 2. The "three-stage pulse method" and "three-stage multiple pulse method" are adopted. At the same time, it also has the traditional high-voltage flashover method and low-voltage pulse method. 3. Any high resistance fault presents simple waveform characteristics similar to low voltage pulse short circuit fault, which is very easy to interpret. 4. It has user-friendly software and full Chinese menu. Key definition is simple and clear. The measurement method is simple and fast. 5. The central control unit is used for one key control to trigger three levels of signal output in sequence to ensure safety and success rate. The central control unit can prompt the operation steps and monitor the work process. 6. It has the function of test waveform storage, which can easily store the waveforms tested on site in the instrument according to the specified sequence for call and observation at any time. A large number of field test waveforms can be stored. 7. The measured fault point waveform and good phase full-length open circuit waveform can be displayed on the screen at the same time for the same screen comparison and superposition comparison, and the fault distance can be judged automatically. 8. 11 inch bright color touch LCD display, with strong data processing ability and friendly display interface. 9. Sampling high voltage protection measures are provided. 10. With 232 computer communication interface and USB communication interface, it is convenient to save data and graphics in the computer. 11. The built-in power supply can test the open circuit and low resistance short circuit faults of the cable in the environment without power supply. [functional advantages of cable fault locator] 1. The data display part adopts a highlighted 4.3-inch OLED color LCD to make the display interface clearer. 2. The function and parameter adjustment part adopts a one key programmable pulse coding keyboard, which makes the operation panel more concise and the operation more convenient. 3. The instrument will collect and display the waveform of the audio part in real time. The distance of the fault point can be roughly observed by observing the repetitive waveform characteristics and distance axis, and the operator is not easy to be tired. 4. There are single and continuous modes in the acoustic magnetic fixed-point mode. If the discharge frequency is too fast and the gap time is too short, the user can select the single mode to carefully analyze the relevant data such as the primary discharge waveform, and the waveform page turning is supported in the single mode. 5. In the acoustic signal acquisition, four filter bands are adopted, including low frequency band, intermediate frequency band, high frequency band and full frequency band, which can be selected by the user according to the actual situation on site. 6. The step voltage part adopts waveform display to continuously sample and refresh the signal, so that the user can enhance the continuity analysis of the signal and the resolution of the jump signal. 7. The step voltage part is subdivided into multiple gears, and the large signal is automatically attenuated during the adjustment process to ensure that the display signal is not limited when the maximum voltage amplitude within the test range is input. 8. FIR digital filtering technology is adopted for audio filtering, which makes the characteristic frequency band more obvious and the filtering performance better. 9. Display the distance of the fault point. The distance of the fault point can be displayed within 0-25m. 10. In continuous mode, the compressed waveform within 15m can be displayed. In single mode, the waveform within 15m can be analyzed.
Buried Cable Fault Tester
Buried Cable Fault Tester
With the continuous strengthening of China's national strength, the development of power system is getting better and better. Cables have been widely used, and have high security because of their own characteristics. However, because most power cables are buried underground, it is inconvenient for people to determine the fault location. If the fault can not be eliminated in time, the resulting loss will be very serious. Underground cable fault tester introduces the underground cable fault tester, which is used to locate underground buried utilities. The basic form is divided into two parts, - one is the transmitter and the other is the receiver. The transmitter part is used to sense the signal to the pipeline or cable, and then the rod or receiver is used to locate the signal generated by the line. Can you find electricity, cable TV, telephone, water or gas pipes and tracer lines? Yes, any underground utility with metal structure and linear and preferably grounded along the path or end point can be located by any so-called cable fault locator. Did you find plastic (or any non-metallic tools)? No, the utility must have metal linearity for the signal of the locator to be transmitted downward. However, if a tracer line is buried next to or included in a non-metallic utility, the metal is metallic and can be located. Sometimes, a metal linear device (such as a plumber's snake or an electronic fish belt) can be inserted into the interior of a non-metallic pipe and positioned by applying a signal to the inserted device. What is the best choice of cable fault locator when there are many utility cables working underground and nearby? Multi frequency mode is preferred. By selecting frequency and power adjustments, this provides a way to isolate utilities from other facilities and reduce interference. Function introduction of underground cable fault tester the underground cable fault tester covers what is necessary to locate and track the path of wires, cables, pipes and conduits, whether buried underground or behind the wall. When you want to dig underground and avoid crossing buried utilities, this section contains a combination of locators and tracers to enable users to identify and mark routes and locations, saving thousands of dollars in maintenance costs. The function of cable fault tester (also known as cable fault tester) is the same as that of most buried utility locators. The transmitter is used to supply power to metal wires (cables or pipes) at a certain frequency by directly conductive connection to metal wires. Connect a single conductor of the transmitter to the pipe. The other - conductor is grounded perpendicular to the line and as far away from the line as possible. This forms a closed circuit that allows the current to flow. The current flowing through the pipe generates a magnetic field, which forms a columnar area around the pipe and represents a signal. A magnetic field is produced by an electric current rather than a voltage. The capacitance increases with the increase of conductor surface area. Therefore, the larger the conductor or pipe, the shorter the signal transmission distance. Buried cable fault detection is quite common in the actual power work, and the cable fault types and causes are also diverse. Therefore, there are enough advanced detection equipment to escort the power. Once a fault occurs, first analyze the fault types and causes, and then determine the fault location according to the fault state, Finally, the fault is handled to ensure the normal operation of the power supply system.
Which Laser Distance Meter Fluke Company Doing OBM?
Which Laser Distance Meter Fluke Company Doing OBM?
You have a great idea on laser distance meter fluke and have done its research and knows it can market such a product, but do not really know how to design it or do not have the manufacturing capability to make it. Then you may turn to ODMs. NOYAFA is such a manufacturer. In most cases, ODMs also manufacture the product they design and their clients get the products branded in their own names and sell them in the market. In the case of an ODM, you may have little to no control over product specifications and so you need to set adequate parameters and frameworks within which the ODM needs to work.SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED is a manufacturer specializing in the laser distance meter fluke field for many years. Our laser distance meter fluke is compact in outline for convenient transportation. Remarkable success has been achieved by SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED in laser distance meter fluke field.Customers value partners who strive to understand and take action to exceed expectations. We can make a difference by serving our customers better than anybody else. Contact!· Related Questions:1. Any laser distance meter fluke factories instead of trading companies recommended?As the laser distance meter fluke itself becomes more and more popular in the market, there has arisen an increasing number of factories in China. Some of them are certified and professional in the industry while others are unqualified and unscrupulous, so you should give 100% concentration and attention to the whole selection process. Here, NOYAFA is a perfect choice for you. We are a professional company with a long-standing history. All production processes involving performance testing and quality assurance testing are carried out strictly following international quality standards. The products manufactured by us are ensured to meet the requirements of product certification. ——————— 2. What are SMEs for laser distance meter fluke?There are large quantities of SMEs for laser distance meter fluke. Please ascertain the needs in finding a manufacturer. Location, production capacity, technology, services, etc. are all factors. NOYAFA is focused on this business. The exports to foreign countries make up a large proportion to the total sales. ——————— 3. Reliable company for laser distance meter fluke“Reliable” is a word to mention those laser distance meter fluke manufacturers who can supply quality products at fair price and can ensure the sustained supplies for long-term cooperation. NOYAFA is one of them. We have been involved in this business for decades, with a strong research and development team and a dedicated service team. We are “reliable” because the products which have gone through 5-10 steps in production, and 2-5 checks in quality control, are quality-high. We are “reliable” because our production lines are operating steadily and are suspended just once every year for maintenance. You are welcome to pay a visit to our factory. ——————— 4. Any brands for high end laser distance meter fluke?Yes, though the manufacturing of laser distance meter fluke is started a few years ago, there have been already some high-end brands established to attract target audience with high-end taste. These brands help solidate the impression of the products, bringing extra value to customers with value-added services like warranty, on-time shipment, and dedicated consultation. Though the price of high-end products under these brands is much higher than the average, they continue to take up some market shares as there exists market demands for ultimate quality products.
How to Choose the Right Bnc Coax Cable Tester
How to Choose the Right Bnc Coax Cable Tester
This type of cable supplies power to the device in question and transmits the video signal to the output. The prefabricated Siamese cable is available in various lengths to keep most camera cables at a distance. The optical cable tester includes a plug for visible light sources that is compatible with the optical cable installation.A cable tester is a microcontroller that displays and automates the test process and displays the test results for multi-wire cables. It connects to the end of the cable separately with a display of the current source portion to allow the injection of test current from one end of a cable to detect the results from a remote end.To check a USB cable, you can perform simple USB tests by connecting the cable end to the appropriate port on the cable tester. You can also check your cloud services, data communications and data transmission by testing connection stability with network cable testers.There are a number of methods to test coaxial cables to obtain a reliable signal frequency. Following are the steps to test a coaxial cable with the help of a multimeter probe. This is a reliable method to test the coaxial cable without signal loss.A network cable tester is a revolutionary device designed to test the reliability and capability of cable connections. It is a necessity for network technicians, network testers, cable testers and other related work in this field. Cable network testers are not only reliable, but also able to fix problems and help you identify cable problems and connection problems.The coaxial cable RG-179 uses a 7.5 Ohm BNC connector and can be used in high temperatures. RG-6 coaxial cable is the "coaxial cable for the Internet" - it is used to transmit the signal over the Internet connection (the Internet signal runs at a higher frequency than traditional analog video). It can be operated up to a distance of RG-59 without loss of the video signal, but it is a thick and rigid cable that is not comfortable to work with.The RG-174 coaxial cable uses the 50 ohm BNC connector and is thin enough for wide applications such as GPS navigation antennas for cars and many vehicles. RG58 coaxial cables use the 50 ohm BNC connectors and are versatile due to their performance. The RG-59 coaxial cable is used to transmit video signals from a CCTV camera to a monitor in another room.Although 75 Ohm coax is likely the impedance found in most of today's applications, it is important to note that all components of a coaxial cabling system must have the same impedance to avoid internal reflections at connecting points that can cause signal loss and poor video quality. High-capacity cables can distort the transmission of digital signals by reducing the distinction between graduated peaks and sinks. 75 ohm coaxial cables are therefore of great benefit for digital transmission, and their lower capacity than 50 ohm cables ensures that all digital transmission passes through the wire with minimal losses or distortions.Digital Signal 3 signals (DS3 signals), which are used to transmit data traffic to the control panels, are called T3 lines and use coaxial cables comprising 7.5 ohms (type 735) and type 734. Type 735 cables are used for distances of up to 6.9 metres, while type 734 cables can be used for distances of up to 13.7 metres.There are various types of adapters for BNC connectors, including T connectors, cylinder connectors and terminators. They can be plugged into any type of connector or SDI signal transport connector.Choosing the right cable is a major problem that plagues most companies and teams. Choosing the right BNC connector for the cable for your project comes at a price. To avoid problems with your network, use BNC connectors instead of compressing or bolting cables.This guide to cabling security cameras provides a practical explanation of the cable types of surveillance cameras and termination cables for easy installation. Siamese cables for surveillance cameras are a two-wire solution with a cable assembly that enables easy video and power transmission to the BNC camera. Curveball Cat5E and Cat6 cables are used to send the video signal to the camera using a video balun adapter.When using a video balun network, the cable does not tip over and requires the lead wire to be exposed by removing the outer layer of the wire at each end.Connect one end of the coaxial cable tester to the socket and bring the other end to a point where several coaxial signal cables meet. The video signal and power supply are transmitted via a single network cable, similar to how Siamese cables work. Another method for network cables is to crimp the RJ45 connector and plug it into the socket of a video power baloon.When you touch the multimeter probe on the end of the right coaxial cable, the meter reads 0 but you will see different readings on the other cables.If your coaxial cable is on the wall, connect an end of the coaxial cable tester to the wall plate and point the other end to the tester to facilitate assembly of the entire cable. To find the right cable, touch the cable one way or the other and a beep will be generated. If it is the antenna on your roof, you can use a multimeter with an aluminum coil to track the right end of a particular coaxial cable.Once you traced and identified the coaxial signal of the cable that you want to test with a multimeter, the next step is to figure out how to perform the task. Touch the center of the conductor end of your coaxial cable with the multimeter probe.Confirm that the shielding patency at both ends of your coaxial cable is in good condition. A second test should be performed on the coaxial cable to determine the status of the screen continuity.
Do You Know How to Choose a Suitable Cable Fault Tester
Do You Know How to Choose a Suitable Cable Fault Tester
Cable fault tester is one of the common equipment to detect cable fault. It has stable performance, can quickly and accurately find out the fault point, and the maintenance personnel can quickly carry out maintenance work, which greatly provides work efficiency. The purchase of cable fault tester is also a problem valued by many friends. Next, we will focus on the precautions for purchase. Another situation of the power supply analysis of the damage of the cable fault tester in recent years, 80% of which is due to the poor wiring or wrong wiring during high-voltage impulse flash, resulting in the damage of the instrument. If the battery is used for power supply, even if the high-voltage is connected in series, it will not form a loop to the earth and can only cause the common mode effect, so as to completely avoid the occurrence of machine damage accidents. Problems of collector and notebook computer: the test scheme of collector notebook is a design scheme proposed by the company in 1996 and put into practice. In 1997, the cable fault test and management system was launched. Through several years of market use, it seems that it does not adapt to China's national conditions. At that time, the principle considered in the design was to give users a good tool and strong data processing ability. But for the following reasons. At present, it has been discontinued. Reasons why notebook collector is not suitable for on-site cable fault test: 1. The on-site environment is not suitable for the use of notebook computers. Generally speaking, notebook computers are relatively delicate and suitable for office or business travel. However, most of the cable fault tests are in substations or outdoors, with large dust, large interference and complex environment, which will greatly shorten the service life of notebook computers. And the sampling waveform is not good. 2. Generally, the switching power supply of notebook computer can only be used when the impact of power grid is small. When the high-voltage impulse flash of cable fault is carried out, the power grid fluctuates greatly, which is very easy to cause damage to the power supply of notebook computer. Therefore, when testing the high-voltage impulse flash of notebook computer, it is emphasized to disconnect the charging power supply and test with the internal battery. 3. In the cable fault test, the high voltage string into the tester is a common problem due to the wiring problem. The impact resistance of the notebook computer is very weak. High voltage enters the notebook computer through the test line collector, which will eventually lead to the damage of the notebook computer interface. Such lessons have been encountered in several cases in our customers. Although current sampling can improve the safety of equipment at present, current sampling is chaotic for short-range fault waveform and difficult to identify, so it is often misjudged when testing short-range fault. 4. Computer viruses will affect the normal use of the equipment. Such problems seem to have nothing to do with our equipment, but users will inevitably make the computer impacted by various computer viruses when using the computer. When there is a problem with the cable, there will be various problems when taking it out for use, and it will not work normally. This results in delayed power supply. At present, the cable fault tester with advanced performance should be equipped with an interface for communication with the computer. Select the cable fault tester with computer interface and test with the cable fault tester on site. After the test, the test waveform needs to be saved and uploaded to the laptop or other computers for archiving, analysis, production of test reports, etc. It should be the best procurement scheme.
What Are the Places Where High Voltage Power Cables Are Most Prone to Failure
What Are the Places Where High Voltage Power Cables Are Most Prone to Failure
We all know that the cable needs to pass the test when it is officially put into the mall. However, the functions and methods of different cable tests are also different. The test method of high-voltage power cable is flicker method. Flicker method includes impulse flash and direct flash. Impulse flash method is also the most commonly used test method. Due to the high precision of impulse flash test, its operation is simple, safe and reliable. The equipment of flicker method is composed of two parts. The high-voltage attack equipment is used to generate DC high voltage or impulse high voltage, which will be applied to the faulty high-voltage power cable. The discharge at the fault point will produce a reflected signal. The current pulse meter is used to pick up the fault interval of the reflected signal, measure some faults such as open circuit, short circuit or low resistance. Fault resistance is also the place where faults are most likely to occur. Based on this measurement method. (1) When the resistance at the fault point is immeasurable, the open circuit fault can be quickly found by measuring with low-voltage pulse method. Simple open circuit faults are not often seen. Open circuit faults are phase to ground or phase to phase high resistance faults, and phase to phase or phase to phase low resistance faults exist together. (2) When the resistance of the defect point is greater than zero and less than 150 kiloohm, the cause of the low resistance problem can be found at will by measuring with the low-voltage pulse method. (3) When the resistance at the fault point is equal to zero, the defect of measuring short circuit by low-voltage pulse method can be found, but this problem is rarely encountered. (4) Flashover defects can be measured by direct flashover method. This problem is usually caused by questionable joints. When the resistance of the fault point is greater than 150 kiloohm, the value changes greatly, so it is very uncertain during measurement. The measured interval is the interval from the fault point to the cable test end; Otherwise, it is the interval from the fault point to the opposite end of the cable test. (5) With the progress of high-voltage power cable fault test skills, different methods should be used for different power cables. We should constantly improve skills and equipment. This allows the safe use of high-voltage cable power for a long time.
no data
Contact Us
Leave a message
We welcome custom designs and ideas and is able to cater to the specific requirements. for more information, please visit the website or contact us directly with questions or inquiries.
During 15 years development, Noyafa has become the most famous brand in cable testing industry in China. With excellent production capability, reliable quality, good after-sales service, we get good reputation from customers all over the world.
no data
Contact Person:Lory Liu
Contact Us

+86-0755-27530990

If you have any question, please contact Lorry via

wire@noyafa.com

Add:Wanjing Business Center, #2506 Xinyu Road, Xinqiao, Baoan District, Shenzhen, China

Copyright © 2021 NOYAFA | Sitemap 

chat online
Please message us and we ensure to respond ASAP, what product you intrested in?