Shop Best Cheap Voltage Tester in NOYAFA

Shop Best Cheap Voltage Tester in NOYAFA

2021-10-20
NOYAFA
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The most up-to-date and effective cheap voltage tester is developed by SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED. We draw on years of experiences to the production. The manpower and material resources are invested in the product from the beginning to the completion, which goes through strict controls. In terms of design style, it has been praised by experts in the industry. And its performance and quality have also been highly evaluated by authoritative testing organizations.Since the establishment, we know clearly the value of brand. Thus, we try every effort to spread the name of NOYAFA over the world. Firstly, we promote our brand through enhanced marketing campaigns. Secondly, we collect the customer feedback from different channels for product improvement. Thirdly, we work out a referral system for encouraging customer referral. We believe that our brand will be highly popular in the next few years.With years' development of our company in the industry, the cheap voltage tester stands out in the crowd. All products information can be viewed at Best Cable Tester Supplier in China _ Noyafa. Customized services can meet the different needs of customers. Samples can be delivered free, on time and safe!
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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.
Brief Introduction of Intelligent Handheld Cable Tester
Brief Introduction of Intelligent Handheld Cable Tester
Intelligent handheld cable tester Handheld cable tester generally adopts pulse reflection method. Judge the fault point according to the returned waveform. The waveform returned during each test will be different due to some external reasons. Therefore, the requirements for the working experience of users are relatively high. In view of this situation, TFN launched an intelligent handheld cable fault tester. The intelligent handheld cable fault tester is equipped with AGC (digital gain automatic control) system; Digital waveform automatic recognition technology; ARM CPU with FPGA technology. The machine automatically recognizes the waveform and judges the fault point. There is also waveform comparison function, which can make you learn waveform recognition faster. Instrument introduction: D131 series cable fault obstruction intelligent rangefinder is suitable for automatically measuring the precise position of core wire obstacles such as broken wire, mixed wire and ground gas of power cable and communication cable. The d131 series is characterized in that it can automatically test many typical faults. The specific features are as follows: 1) DAGC (digital gain automatic control) system: digitally adjustable gain. Eliminate the waveform distortion of the original instrument of the same type due to the potentiometer knob. It can also be used for pure linear adjustment, which is conducive to manual testing. 2) Digital waveform automatic recognition technology: rely on the machine to automatically recognize the waveform that is difficult to judge manually. 3) Using ARM CPU and FPGA technology, it can quickly carry out various complex operations and accurately judge the fault waveform. 4) Waveform comparison function is convenient to compare the test waveforms of fault line and normal line, and clearly locate the fault point. 5) Large screen color LCD display, humanized interface menu design, fast digital buttons, convenient for users to operate. 6) High energy lithium battery can be used for up to ten hours (charging with a special charger). 7) Wave speed memory, power on after power off, and the wave speed is automatically set to the wave speed at the last power off. fqj
Dry Goods Sharing Brought by Power Cable Pathfinder Manufacturers
Dry Goods Sharing Brought by Power Cable Pathfinder Manufacturers
It is generally believed that wear and aging caused by daily time accumulation and sudden faults caused by external factors will affect the use of cables. Both of them will cause fault trip, interrupt power supply operation, and cause power grid paralysis in serious cases. Among these factors, the time accumulation factor can be controlled artificially, resulting in a very small probability of failure, while the external environmental meteorological factors can not be controlled, resulting in a very high probability of failure and great destructive power. Below, the manufacturer of power cable Pathfinder summarizes this problem. 1、 Lightning strike power cable Pathfinder manufacturers believe that lightning weather is common in rainy season and has great randomness. A large number of transmission lines erected in the field have the characteristics of large tower span and large height difference, which makes the lightning resistance level of the line relatively poor and vulnerable to lightning. In harsh terrain, there are many single circuit lines, and there is no shielding and shunt protection provided by parallel lines, which increases the incidence of lightning accidents. Lightning trip accounts for the largest proportion of transmission line faults, and the lower the voltage level, the higher the probability of lightning fault. In order to reduce the probability of lightning accidents on transmission lines, it is necessary to prevent flashover, arc building, direct strike and line interruption. The following protective measures shall be taken: 1. Erect lightning conductor. 2. Add coupling ground wire. 3. Reduce the impact grounding resistance of iron tower. 4. Neutral point indirect grounding system is adopted. 5. Strengthen the line insulation level. 6. Automatic reclosing shall be installed. 7. Install tubular lightning arrester. 2、 Typhoon weather is accompanied by strong wind and rainstorm, and accidents such as conductor galloping, wind deviation, line breaking and tower falling will occur on the transmission line. Broken lines and inverted towers are prone to North-South disconnection. With the increase of the designed wind speed of the power system on the transmission line, the probability of line breaking and tower falling accidents decreases, but the probability of accidents caused by violent swing of conductors, wind bias discharge and damage of floating objects is high. For the vibration lines with low wind speed, most of the lines can be controlled by installing anti vibration devices. In case of strong wind speed, the following measures can be taken: 1. Add anti vibration hammer and heavy hammer device to increase the vertical load carrying capacity of the transmission line and reduce the left and right swing amplitude of the line. 2. Install damping wires and armour rods, increase the number of split wires, strengthen conductors, and ensure the safe distance between conductors and iron tower. 3. The suspension mode of V-shaped insulator string is adopted to enhance the insulator resistance to lateral drift with the wind and reduce the wind deflection swing angle of insulator string. 4. When designing tower type and erecting transmission line, it is considered to leave a large distance between conductors, move down the hanging point, or lengthen and widen the cross arm. 3、 Mountain fire is caused by high temperature, human factors and other factors, which makes the air in the state of high temperature and low humidity for a long time. It is located in the mountainous terrain, between the transmission line crossing forest vegetation and the earth or between phase lines. Due to the rise of thermal dissociation of air particles, the increase of charged charge and the acceleration of particle movement The occurrence of line flashover tripping due to the formation of conductive channel accounts for 90%%uff0c of mountain fire tripping, which is the main cause of mountain fire tripping. It also includes the burning of line insulation at high temperature and the discharge of conductor to tower. In view of the mountain fire phenomenon, we should start with the fire prevention measures to reduce the incidence of mountain fire: 1. Control the height, quantity and type of trees near the tower base. 2. Emergency response measures shall be established, and safety passages with sufficient length and width shall be reserved. 3. The line protection system is reliable and sensitive. 4. Establish a real-time monitoring system and improve the monitoring effect; ⑤ Increase line inspection and eliminate hidden dangers by season, time period and weather conditions.
Structure of Mine Cable Fault Tester
Structure of Mine Cable Fault Tester
1. The mine cable fault tester is composed of control part (low voltage) and high voltage rectifier, discharge and test part. Sufficient safety space shall be reserved between high and low pressure room, high and low pressure room and shell. 2. In order to ensure the safety of equipment and personnel, special personnel must operate with keys before high-voltage startup. 3. During each flaw detection or cable test, it can ensure that the high voltage rises slowly from the zero position, with the shape of high and low voltage limit. The pressure rise or fall process is controlled by the button, the voltage rise and fall rate is stable, and the operation is safe and simple. 4. The DC withstand voltage test time can be automatically carried out after digital (or manually controlled), and the test time is accurate and reliable. 5. The leakage current can be measured at any time according to the needs of the withstand voltage test process. 6. The mine cable fault tester has over-current and short-circuit protection, startup warning and over-current protection. 7. The control panel is equipped with power switch, high-voltage start, high-voltage stop, step-up, step-down and other switches or buttons, voltage withstand test, digital time timing relay, etc. 8. There are high voltage, leakage current, low voltage total current and other measuring meters on the display board, power supply, high voltage, timing and other indicator lights, curve observation window for ball gap discharge, etc. 9. Special high voltage discharge * * is equipped for discharge after each flaw detection or test to ensure safety. There is a grounding mark at the bottom of the box. 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!
How to Diagnose and Solve Cable Leakage with Cable Fault Tester
How to Diagnose and Solve Cable Leakage with Cable Fault Tester
How can the cable fault tester diagnose and solve the cable leakage? As the main cable fault, when the power cable leaks to the earth, it will produce a strong to weak directed electric field gradient around the fault point on the ground. The amplitude and direction of the signal can be measured by Bao Shun Tong cable fault measuring equipment along the cable path. Before and after the fault point, the direction pointed by the galvanometer pointer is opposite, so as to find the fault point of the cable and achieve the purpose of accurate positioning. 1. Cable fault diagnosis depends on the nature of the fault. Cable fault can be divided into low resistance grounding or short circuit fault, high resistance grounding or short circuit fault, wire break fault, wire break and grounding fault and flashover fault. Cable fault diagnosis can determine the type and severity of cable fault, and it is also convenient for testers to test it with different test methods according to different fault types. For example, for high resistance faults, the impulse flash method can be used to locate the fault location. 2. Cable fault location. Cable fault location is also called rough measurement. There are two rough measurement and location methods: electric bridge method and wave reflection method. At present, wave reflection locator is more popular. However, several cable faults are difficult to find by wave reflection method, such as insulation defect points of high-voltage cable sheath, steel tape armored low-pressure cable, PVC cable and short cable can not be located. In addition, some high breakdown points cannot be broken down under impulse voltage and are difficult to locate. 3. Cable fault point. It is also called precise measurement. The cable fault can be accurately fixed through the methods of acoustics, electromagnetism, electronic signal processing and electronic cancellation theory. The LCD can display the sound pulse, magnetic pulse and the distance between the fault point and the probe test point at the same time. At present, the cable fault can be accurately fixed by the following four methods: (1) Acoustic measurement method: the high-voltage pulse generator discharges the fault cable, the fault point generates an arc and generates a discharge sound. When the cable is directly buried, it generates a seismic wave. The acoustic probe of the pointing instrument picks up the seismic wave signal and amplifies it and outputs it through the headset or meter head. (2) Step voltage method: it is mainly aimed at the fixed point of outer sheath grounding fault with requirements for cable outer sheath insulation. Now, step voltage method can also be used for the fixed point of some directly buried unarmored low-voltage cables and wire core grounding fault. (3) Electromagnetic method and audio method: fix the point with electromagnetic wave or audio method, that is, determine the fault point by using the change of electromagnetic wave signal or audio signal at the front and rear points of cable fault. (4) Acoustic magnetic synchronization method of cable fault tester: it is the comprehensive application of acoustic measurement method and electromagnetic wave method. Then, according to the above operation methods, we believe that the fault point can be found soon, and we can quickly repair and restore the normal operation of power.
Design Features of Cable Fault Locator
Design Features of Cable Fault Locator
Cable fault locator is a set of 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 and poor contact. The cable fault locator is equipped with an acoustic pointing instrument, which can be used to accurately determine the accurate position of the fault point. It is especially suitable for testing power cables and communication cables of various models and different levels of voltage. The cable fault locator adopts a variety of detection methods and applies the achievements of contemporary advanced electronic technology. 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. It is very important in civil aviation maintenance to detect aircraft cable fault; 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, electric power and other departments. 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 intelligent cable fault tester, underground cable fault tester, street lamp cable fault tester, etc. The enterprise adheres to the tenet of building a business in good faith, keeping the business with quality and developing the business with enterprising. It continues to climb new peaks with a firmer pace and make contributions to the national automation industry. New and old customers are welcome to buy their favorite products at ease. We will serve you wholeheartedly!
What Are the Functions of the Cable Identifier
What Are the Functions of the Cable Identifier
1. Left and right direction indication: the left and right arrows show the cable position, which is convenient and intuitive. 2. Tracking error prompt: the innovative patented technology of AC signal direction measurement is used to eliminate the ground wire return and induced current interference of adjacent and cross pipelines. When correctly tracking the cable to be tested, the pointer points to the front; When tracking to the adjacent cable, the pointer will be backward and a question mark will be displayed to prompt the tracking error. 3. High anti-interference: the unique digital processing method can completely suppress the power frequency and harmonic interference of adjacent operating cables. 4. Sound prompt: when it is very close to the top of the cable, there is a sound prompt. 5. Single key measurement of pipeline depth and current intensity: it can directly read the depth value and the current carried by the cable. 6. Multiple detection methods: in addition to the traditional sound peak method and sound Valley method, innovative and accurate methods are especially provided. The sensing range of the traditional sound peak method is too large, which is not conducive to accurate detection. Although the sound Valley method is accurate, it can not distinguish the parallel cable. The accurate method has a very narrow response range, is very accurate, and can distinguish the parallel cable. It is a better way to find the path in the complex area of the pipeline. 7. Two active detection frequencies: 1kHz, suitable for basic off-line detection; 15KHz is suitable for special situations. 8. Passive detection: it can directly detect the running cable without connecting the signal generator, and can also be used to detect other pipelines. 9. Historical curve display: the screen displays the historical curve of signal amplitude to visually judge the signal change. 10. Uniqueness identification: the detection caliper is used to identify the uniqueness of the cable. Through the combined signal sent by the detection generator, the amplitude and direction of the current on the cable can be accurately measured, and the identification results can be clearly given. 11. Built in battery for easy replacement: built in Ni MH battery provides reliable charging mode. Rechargeable batteries and dry batteries can be used interchangeably and can be replaced easily. Even if the battery fails, it can be easily replaced without repair, and it is conducive to emergency use without timely charging. 12. Low power consumption and long battery life: the instrument can work continuously for more than 30 hours by using a fully charged Ni MH battery or a new alkaline battery. 13. Automatic shutdown function: when the instrument does not operate within 30 minutes, it will automatically shut down to reduce battery consumption; When the battery is under voltage, the instrument will also shut down automatically to protect the battery. 14. The casing is durable, light and easy to carry.
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!
Working Principle of Cable Identification Instrument
Working Principle of Cable Identification Instrument
The working principle of the cable identification instrument needs to add a special signal to the identified cable, which should be received by a special receiver. Using this characteristic, the cable to be found can be identified. The cable identification instrument works according to the following principles: the cable identification instrument consists of a signal generator, a receiving clamp signal detector and an indicator. The signal generator mainly generates special pulse modulation signals, which are added to the stopped tested cable through the output line. The receiving clamp is used to find the tested cable on site. When the receiving clamp detector detects the special signal applied to the cable, The electric meter pointer on the signal detector swings synchronously with the frequency of the applied signal, while the signals detected on other cable lines are much smaller and in the opposite direction. It is easy to determine the tested cable by indicating the amplitude and direction of the electric meter. When the receiving clamp signal detector is used in combination with the signal generator, it can be used to distinguish the charged state of the cable, or assist in finding the short circuit position of the cable. When receiving clamp signal detector is used, clamp the cable with clamp. Dear customers: the company also has high-voltage cable fault locator, underground pipeline detector, power cable fault tester and other products. You can call the company's service phone through the web page to learn more product details. Perfect and beautiful service is our pursuit. New and old customers are welcome to buy their favorite products at ease. We will serve you wholeheartedly!
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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.
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