What Is High Voltage Power Cable?

What Is High Voltage Power Cable?

2021-11-06
NOYAFA
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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.
Location Method of High Resistance Damage in Power Cable Line
Location Method of High Resistance Damage in Power Cable Line
In order to preliminarily determine the high resistance damage in power cable lines, the combination method of high voltage reflection method is usually used: pulse arc method and vibration discharge method. In this paper, we will consider the main ideas embedded in these methods and how they work. In addition, we will discuss the equipment to implement these two methods. 1、 Pulse arc method (ARM) is used to determine high resistance damage. The main idea of pulse arc method is to use a special high-voltage pulse generator. For example, in the arc cable generator of power cable, oil first creates conditions for the generation of high resistance defects and causes short-term arc (breakdown). According to the magnitude of the leakage current and the power of the current source, use one of two ways for the generator to act on the cable line: 1. Smoothly charge KL's own capacity (cable) from the generator current source until breakdown occurs. This method can be used if the leakage is so small that the power supply of the high voltage pulse generator is sufficient to charge before breakdown. For defects with serious leakage, this method is not applicable. 2. Charge the built-in capacitor of the generator to the required voltage (not exceeding the test standard), and then discharge the cable instantaneously. In this case, the high-voltage pulse propagates in the cable, which will lead to failure when it reaches the location of the defect. This method can be used to search for defects on cable lines with serious leakage. In both cases, the use of inductors integrated in the generator will delay the arc combustion time. The current pulse from the breakdown (propagating from the defect to the input of the generator) triggers a synchronous circuit that starts the low-voltage sounding through the cable fault locator (also known as the cable fault tester). The physical characteristics of the arc have low resistance, and the detection pulse of the cable fault locator is also reflected from medium and low impedance defects (short circuit). Advantages of pulsed arc method the pulsed arc method (ARM) for determining high resistance damage has several advantages. This is a non-destructive method, because unlike combustion, the impact of high voltage on the cable is short. Unlike combustion, this method will not reduce the cable parameters as a whole, and will not cause new damage where the insulation resistance is still within the normal range. Arm is actually a high-precision method, because the measurement is actually carried out by pulse method. 2、 The vibration discharge method (ice / attenuation) should deal with high resistance damage. The vibration discharge method is used to find damage on a long cable line, or when the pulse damping of the underground cable fault locator is too large for some reason to apply the pulse arc method. The vibratory discharge method allows you to locate most faults that can be detected using the pulsed arc method, but usually reduces accuracy. It should be noted here that the function of the cable is not displayed when operating by the vibration discharge method. Current oscillation discharge method (current fluctuation method, ice) when the wave current method is used, the oscillation circuit is formed by the system: capacitor on the source side - Cable - low transition resistance (or arc) at the defective part. When the method of vibration discharge through current is used, according to the leakage current value and the power of the current source, here, as with the pulse arc method, one of the two methods of exposing the cable to the generator is used: 1. Smoothly charge the CL capacitor from the generator current source until breakdown occurs. This method can be used if the leakage is so small that the power of the current source is sufficient to charge before breakdown. For defects with serious leakage, this method is not applicable. 2. Charge the built-in capacitor of the generator to the required voltage (not exceeding the test standard), and then discharge the cable instantaneously. In this case, the high-voltage pulse propagates in the and reaches the defective part, resulting in breakdown or large discharge current. This method can be used to search for serious defects. The discharge current pulse returned to the source will charge its capacitor, which in turn. The wave reaching the defect may cause a discharge in it again (in this case, its polarity will change), or if a second discharge does not occur, it will reflect with the same polarity and repeat the process again until all the energy of the initial pulse disappears. These vibrations are displayed on the screen of the cable fault locator connected to the cable through the inductive sensor.
How Much Do You Know About the Cable Fault Tester
How Much Do You Know About the Cable Fault Tester
In recent years, China's computer technology and electronic technology are developing rapidly, so the product performance of many industries has been continuously improved. The cable fault tester is also like this. Its functions are more reliable and rich, and its service life has been improved to a certain extent. Today we are going to talk about the new highlights of the cable fault detector. 1、 New intelligent modules are added to the cable fault test: new sensors such as optical fiber sensors, polymer sensors and biosensors continue to appear and will develop rapidly. 2、 The emergence of new cable fault test fieldbus structure: expand the self diagnosis function of cable fault test instrument and facilitate maintenance. The connection of cable test system is more reliable and simple. Therefore, the installation cost is greatly reduced and the control scale is variable. 3、 Function integration of electronic cable test system: it is more closely combined with computer, power electronic devices and strong current control, and the continuous control and intermittent control are used at the same time. In the selection of cable fault tester, such products can be scientifically selected according to the cable characteristics of their industry, and the most suitable tester combination can be selected, which can greatly improve the work efficiency and avoid unnecessary waste of funds. At present, the cable fault testers used by power departments are basically designed and produced based on the principle of impulse flash method; In terms of its principle, it is most appropriate to solve the high resistance leakage and high resistance flashover faults. At this time, when the fault point is discharged, the voltage is high and the sound is loud, so it is easy to point on the ground. At present, there is only one solution in the world, but such faults are not very common. Use advantages: 1. Complete functions, safe, rapid and accurate test failure. 2. The instrument adopts low-voltage pulse method and high-voltage flashover method to detect various cable faults. It can directly test the flashover and high resistance faults of power cables without burning through. If equipped with a sound point meter, the position of the fault point can be measured accurately. 2. High test accuracy. The instrument adopts high-speed data sampling technology, with reading resolution of 1m and high intelligence. The test results are automatically displayed on the large screen LCD with small and data, and the fault judgment is intuitive. It is also equipped with menu display operation function, without special training for operators. 3. It has the functions of wave opening, parameter storage and call out. Nonvolatile devices are adopted, and the waveform and data are not volatile after shutdown. 4. With dual trace display function. The test waveform of the fault cable fault tester can be compared with the normal waveform, which is conducive to further judgment of the fault. 5. With waveform scaling function. Changing the waveform proportion can expand the waveform for accurate test. 6. Control the measurement cursor to automatically search along the line and stop automatically at the inflection point of the fault waveform. 7. The position of the double cursor can be changed arbitrarily to directly display the direct distance or relative distance between the fault point and the test point. 8. With printing function. Print and archive the test results.
Introduction to Technical Indexes and Characteristics of Cable Identification Instrument
Introduction to Technical Indexes and Characteristics of Cable Identification Instrument
Today, we will give you the technical indicators and technical characteristics of popular science cable recognizer. Friends interested in this aspect can refer to this article. Come with Xiaobian. It is a common technical problem for power cable engineers and cable workers to accurately identify one of the target cables from a bundle of cables. This sometimes requires not only professional cable identification equipment, but also rich experience of staff. The purpose of the cable identification instrument is to avoid serious accidents caused by sawing live cables by mistake. The cable identification requires professionals to ensure that the double number of cable equipment is accurate from both ends of the cable. No matter how reliable the memory of on-site staff is, it can not replace the identification of professional instruments. Cable identification instrument is a special instrument developed according to the special needs of cable application. It is used to identify the power cut cables from a bundle of cables in cable management, erection, migration, maintenance and fault treatment. For the cable maintenance industry, the cable identification instrument is a very familiar instrument. It is indispensable to use this product in the installation and maintenance of power cables. The main reason is that it can help us provide accurate measurement data. The cable identification instrument consists of a signal generator, a receiving identification clamp and an indicator. When using the receiving identification clamp signal detector, 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 by the electric meter. Let's take a look at its main technical indicators. 1. Detection route and farthest fault location distance: 3km for cables with diameter less than 0.5, and 20km for other cables. 2. Fault insulation resistance at accurate point: 0-50m & omega;. 3. Positioning test accuracy: 10cm. 4. Detection cable depth: 3M technical features: 1. The transmitter and receiver of the complete cable identification instrument are powered by battery, which completely gets rid of the dependence on 220V mains power and is more conducive to field work. 2. The cable identification receiving coupling clamp adopts flexible clamp, which is more conducive to the occasions with dense cables and heavy cables. 3. Large screen color LCD display and voice prompt are adopted on the display interface, which improves the efficiency in cable recognition and is simple and easy to operate.
Main Features of Cable Fault Tester
Main Features of Cable Fault Tester
Cable fault tester is a comprehensive cable fault detection instrument. It can test the cable flashover fault, low resistance grounding, short circuit, cable disconnection, poor contact and other faults. If equipped with an acoustic point detector, 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. The cable fault tester has the following remarkable characteristics: 1. It has complete functions and can test faults safely, quickly and accurately. The instrument adopts low-voltage pulse method and voltage flashover method for detection, which can test various faults of cables, and directly test the flashover and resistance faults of power cables without burning through. If equipped with a sound point meter, the position of the fault point can be measured accurately. 2. Test accuracy. The instrument adopts fast data sampling technology with a reading resolution of 1m. Degree of intelligence. The test results are automatically displayed on the large screen LCD with small and data, and the fault judgment is intuitive. It is also equipped with menu display operation function, without special training for operators. 3. It has the functions of wave opening, parameter storage and call out. Nonvolatile devices are adopted, and the waveform and data are not volatile after shutdown. 4. With dual trace display function. The test waveform of the faulty cable can be compared with the normal waveform, which is conducive to further judgment of the fault. 5. With waveform scaling function. By changing the waveform proportion, the waveform can be expanded for testing. 6. Control the measurement cursor to automatically search along the line and stop automatically at the inflection point of the fault waveform. 7. The position of the double cursor can be changed arbitrarily to directly display the direct distance or relative distance between the fault point and the test point. 8. With printing function. Print and archive the test results.
What Companies Are Developing Fiber Optic Testing Procedure Independently in China?
What Companies Are Developing Fiber Optic Testing Procedure Independently in China?
Mainly there are 3 types of production standards - industry, national and international standards. Some fiber optic testing procedure manufacturers may even establish their unique production management systems to guarantee the product quality. The industry standards are made by industry associations, national standards by administrations and international standards by certain authorities. It is a common sense that international standards such as CE certification, are necessities if the manufacturer intends to do export business.SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED is a strong fiber optic testing procedure company. To save the energy, NOYAFA puts the eco-friendly materials into use during the production. SHENZHEN NOYAFA ELECTRONIC CO.,LIMITED has strong manufacturing strength to meet the global market demand of fiber optic testing procedure.Our mission is to provide a friendly professional service which exceeds our customer’s expectations, and to build long lasting and satisfying working relationships. Welcome to visit our factory!· Related Questions:1. What standards are followed during fiber optic testing procedure production?Mainly there are 3 kinds of production standards - national and international standards, industry. Some fiber optic testing procedure manufacturers can even establish their particular production management systems to ensure that the product quality. The industry standards are created by industry associations, nationwide standards by administrations and international standards by certain authorities. It is a frequent sense that international standards such as CE certification, are essentials if the manufacturer intends to perform export business.
Pulse Method of Cable Fault Tester
Pulse Method of Cable Fault Tester
Cable plays a very important role in daily life. If the cable fails, find the fault point in time and then repair it. Cable fault detector is the preferred tool for cable maintenance. It can accurately find the fault point, and then the construction personnel can carry out maintenance quickly, which is very effective in improving work efficiency. Today, we follow the cable fault tester manufacturer to understand what pulse method is. Working principle of power cable fault tester power cable fault tester consists of three main parts: power cable fault tester host, cable fault locator and cable path tester. 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 location of the cable fault point based on the approximate location 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. The working principle of the application of arc reflection method (secondary pulse method) in cable fault location: firstly, a high voltage pulse with a certain voltage level and energy is applied to the faulty cable at the test end of the cable to make the high resistance fault point of the cable break down and burn arc. At the same time, add the low-voltage pulse for measurement at the test end. When the measurement pulse reaches the high resistance fault point of the cable, it encounters an arc and reflects on the surface of the arc. When arcing, the high resistance fault becomes an instantaneous short-circuit fault, and the low-voltage measurement pulse will change obviously in impedance characteristics, so that the waveform of flashover measurement becomes a low-voltage pulse short-circuit waveform, making the waveform discrimination particularly simple and clear. This is what we call the secondary pulse method. The received low-voltage pulse reflection waveform is equivalent to the waveform of a complete short circuit between the core and the ground. Superimpose the low-voltage pulse waveform obtained when releasing the high-voltage pulse and when not releasing the high-voltage pulse. The two waveforms will have a divergence point, which is the reflected waveform point of the fault point. This method combines low-voltage pulse method with high-voltage flashover technology, which makes it easier for testers to judge the location of fault point. Compared with the traditional test methods, the advantage of the secondary pulse method is to simplify the complex waveform in the impulse high-voltage flashover method into a simple low-voltage pulse short-circuit fault waveform, so the interpretation is very simple and the fault distance can be accurately calibrated. The multiple pulse method adopts the double impact method to prolong the arc burning time and stabilize the arc, which can easily locate the high resistance fault and flashover fault. Cable fault tester manufacturers believe that the multiple pulse method has advanced technology, simple operation, clear waveform and fast and accurate positioning. At present, it has become the mainstream positioning method of high resistance fault and flashover fault. The multiple pulse method is an upgrade of the secondary pulse method. The method is to first measure the reflected waveform of the low-voltage pulse without breaking through the fault point of the measured cable, then impact the fault point of the cable with the high-voltage pulse to generate an arc, trigger the medium voltage pulse when the arc voltage drops to a certain value to stabilize and prolong the arc time, and then send the low-voltage pulse, Thus, the reflected waveform of the fault point is obtained. After the superposition of the two waveforms, it can also be found that the divergence point is the corresponding position of the fault point. Because the medium voltage pulse is used to stabilize and prolong the arc time, it is easier to obtain the fault point waveform than the secondary pulse method. Compared with the secondary pulse method, the triple pulse method does not need to select the synchronization time of arc burning, and the operation is also more simple. Cable fault tester is a comprehensive cable fault detection instrument. It 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 the acoustic method pointing instrument, 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. The above is the introduction of the pulse method by the cable fault tester manufacturer, hoping to provide help to those in need.
Top Rated Wire Testers, Cable Tracer, RJ45 Crimper
Top Rated Wire Testers, Cable Tracer, RJ45 Crimper
The introduction of wire testerWire tester is used to measure the electrical current of an electrical wireWire testers are used in the manufacturing industry to measure the electricity flowing on a metal wire. This proves that there is no current leakage or any other problems with the wiring.The most basic advantages of using wire testers are cost and efficiency. They are simple devices that can be set up quickly and require less person-power to work. The other advantage is accuracy - they provide data that helps manufacturers identify small faults before it becomes big one.Tips for wire testerWire testers are the engineers who design, build, and test the electronic circuits on a circuit board. They are responsible for ensuring that the product is ready for production and that it works just like designed.A wire tester’s job is not only to make sure that electronics function properly but also to detect any electrical bugs or faults in the circuit board during testing. It’s important to note that finding a problem early is key when it comes to testing.In order to achieve this, wire testers need a variety of skillsets such as understanding electronics and electrical circuits, troubleshooting malfunctions, reading schematics, managing time efficiently, and more.How to use wire tester?Wire testers are an electronic device that helps you test wires. It can be used for electric wiring and cable wiring. When wire testers are used, they let you know if the wire is providing electricity or not.Wire testers are used in many fields, including aerospace, construction, computer engineering, electronics, fire alarm systems and many more. Because of their versatility and cost-effectiveness, they are highly demanded by professionals in different industries.If you want to use a wire tester to test a wire or cable for electricity then all you need to do is connect it and press the start button before connecting the positive terminal of a 12V battery and wait for 30 seconds and compare the readings of the LED with those on your meter reading.The specifications of wire testerWire testers are used in the process of electric wire installation. They are also used for other purposes, such as PCB manufacturing and repairing.For any type of wire installation, there are a few general tasks that need to be done before the wire can be connected to something else. These include connecting a wire to a terminal by using an insulating washer, attaching an insulated conductor, and making sure that the contact is good enough to conduct electricity. A tool called a wire stripper is typically used for this purpose.A wire tester is typically made from metal and plastic materials with two terminals at either end, one positive and one negative. One terminal will usually be fitted with an insulating washer while the other has a stripping wheel on it.The product instructions of wire testerWire testers use these instructions to help create the perfect circuit. This tutorial is useful for beginning as well as advanced wire testers.Wire Testers use these instructions to help create the perfect circuit. These instructions are useful for beginners and advanced wire testers, whether they are hand-soldering or using a pre-made PCB.Here is a list of what you will need: Wire, copper tape, needle nose pliers, soldering iron, solder wickThe application of wire testerWire tester is an application that can identify electronic devices that may have unprotected and unsecured data.Wire tester is an application that can identify electronic devices that may have unprotected and unsecured data. Wire Tester’s features include identifying WPA/WPA2-protected wireless networks, scanning Wi-Fi for open access points, scanning the local network for open ports, and using its own automated tools to assess the security of a device.
What Is the Difference Between Medium and Low Voltage Cable Fault Tester and Traditional Tester
What Is the Difference Between Medium and Low Voltage Cable Fault Tester and Traditional Tester
Since the buried cable appeared in our life, cable fault detection has become a test of people's work. How to accurately find out the cable fault point through layers of soil requires not only the experience of maintenance personnel, but also corresponding equipment support. Cable fault tester is one of the commonly used detection equipment. Today, we mainly discuss the difference between the medium and low voltage cable fault tester and the traditional one. Difference analysis between medium and low voltage cable fault tester and traditional cable fault tester: first, introduction of fixed-point method of cable fault. There are two kinds of cable fault rough measurement methods: electric bridge method and pulse reflection method. There are the following methods for cable fault fixed point: 1. Acoustic measurement method: acoustic measurement method is used for fixed point, which is a common method for cable fault fixed point from the past to the present. And it is the most effective method. However, the instrument used has developed from a simple acoustic electric amplifier to an acoustic magnetic synchronous fixed-point instrument widely used now. The fixed point of acoustic measurement method is applicable to high-voltage cable, low-voltage cable, directly buried cable, cable trench cable, etc. 2. Step voltage method: step voltage method is adopted for fixed point, which 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 fixed point of grounding fault of some directly buried unarmored low-voltage cables and wires. 3. Electromagnetic method and audio method: it is feasible to fix the point with electromagnetic wave or audio method in principle. However, from the current situation, there is no fixed-point instrument with reliable performance and practical application. In other words, the fixed-point instrument using electromagnetic wave fixed-point is still being developed by various scientific research institutions, which needs to be further verified and improved in practice to reach the practical application level. 2、 Introduction to medium and low voltage cable detector (bridge tester): most of the medium and low voltage cable detectors in circulation in the market now complete the function of cable fault rough measurement. Its principle is generally using the electric bridge method, but now it has adopted computer technology and intelligent electric bridge. There are low-voltage bridge, high-voltage bridge and so on. Some instruments also use the principle of ultra-high voltage digital bridge. The voltage applied to the fault point is generally more than 200V, and the most Gao can be added to 20kV. For cable fault with low fault resistance (resistance less than 600m & omega;). The fault distance can be roughly measured with medium and low voltage cable detector. Scope of application: applicable to leakage fault test with low fault resistance value. It is generally used for cable fault test below 6000V & lt; Rough measurement of fault distance & gt Advantages: for cable faults suitable for testing, it is simple to use and has low technical requirements for users. Fool test. In addition, for some fault points, such as some cable joint faults, due to the long creepage distance of the fault point, the fault of flashover discharge cannot be formed. Because the pulse flash method cannot be used to roughly measure the fault distance, the electric bridge method has its advantages. In the actual test, when the insulation resistance of the fault point is lower than 100m, but the high-voltage flashover test (impulse voltage is greater than 20kV), the low-voltage measured discharge current displayed by the operation box does not exceed 5a, and the sound is clear when the ball gap is discharged, which indicates that the fault point has not formed flashover discharge, and the flash tester displays the full-length waveform of the cable. In this case, we can basically conclude that the cable intermediate joint is faulty. The middle head can be excavated directly, and the cable fault pointing instrument can be used for accurate pointing, so as to further diagnose the fault point.
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