Correct Use of Live Cable Identifier

The cable identifier has the main function of identifying a cable from a bundle of cables. The utility model is composed of a receiver and a connector of a signal generator and a sensor. It is commonly used in cable erection, migration, maintenance and fault handling. It is divided into live cable identifier and non live cable identifier. Let's talk about their own search methods. 1. Search method of live cable recognizer: when the line is live, we can't affect the normal operation. When identifying the cable with points, we use the induction method to measure. The high-frequency signal is transmitted through the caliper. After receiving the signal characteristics, the receiver filters through software and hardware. During phase identification, when the receiving caliper clamps the cable according to the current direction, the identified cable ammeter deviates to the right, Accompanied by audible and visual indication. The current direction of other cables is opposite to that of the identified cable, and the ammeter pointer deviates to the left. No audible and visual indication. This reflects the uniqueness of the identified target cable. It is easy to distinguish the identified cable from multiple cables. Since the signal current strength on the identified cable is the same throughout the line, the electromagnetic signal strength received by the receiving caliper along the cable is the same. In principle, the identified cable is not limited by the length of the identified cable. 2. Search method of dead cable identifier: the search method of dead cable identifier is basically connected with live identification. The generator feeds periodic unipolar voltage pulses into the cable to be identified. The cable needs to be grounded at the far end to ensure that enough current flows through the cable. The direction of pulse current fed into the cable can be used as an obvious identification standard, The outgoing current only passes through this cable. All other adjacent cables flow through the return current, but their polarity is opposite. The direction and size of the current flowing through the cable are detected through the receiver. It is equipped with an amplifier and connected in series in the circuit. The sensor clamps the measured cable. The magnetic field generated by the current flowing through the cable induces a voltage in the coil of the sensor, The voltage polarity is determined by the current direction and the direction of the sensor coil, so as to identify the cable. Since the cable shielding layer is usually connected to the ground, if other cables in the cable bundle are also connected to the public ground, the black output jack on the generator can be connected to the public ground. The return current is distributed in several cable shielding layers and divided into many tributaries, which means that the difference current of the identified cable is large and the useful signal is clear, The difference means that the output current and its divided return current are in the same channel.

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Cable Identifier Manufacturers Popularize Science on Information Security of Power System
Cable Identifier Manufacturers Popularize Science on Information Security of Power System
China's science and technology are developing continuously and its economy is growing steadily. In this environment, the development speed of China's power industry is not the same as before. However, in today's society, facing the increasing demand for power in people's production and life, the power industry can ensure people's power consumption only by doing a good job in safe production. Now let the cable recognizer manufacturer popularize some knowledge about power system information security. In recent years, with the rapid development of power grid, especially power grid dispatching automation system, power dispatching control business has become the lifeblood of power system. According to the security protection regulations of power grid, power plant computer monitoring system and dispatching data network, the power control system must be effectively and safely isolated from the office automation system. The above-mentioned isolation means that the dispatching data network used by the power control system must be physically isolated from the public information network and the Internet, and a national power system information security protection system, security responsibility system and security joint defense system must be gradually established. The goal of power grid information security is to prevent the power grid, power plant computer monitoring system and dispatching data network from being attacked, prevent power system accidents caused by attacks, ensure the safe, stable and economic operation of power system, and protect the safety of important national infrastructure. Therefore, building the security protection system of dispatching automation system has become an important task of power grid dispatching automation in the future. Power grid information security has become an important link in the production, operation and management of power enterprises. 1、 Security protection scheme of main station of network dispatching automation system security protection strategy of main station of network dispatching automation system. Security zoning, network dedicated, horizontal isolation and vertical authentication are the basic strategies for security protection of power secondary system. Its core idea is two isolation, namely, effective and safe isolation between control system and office automation system, and physical isolation between dispatching data network, public information network and Internet. 2、 The basic principle of security protection of power real-time data network system. In theory, although the power real-time data network system with absolute security and confidentiality can not be established, if some reasonable principles are followed at the beginning of construction, the corresponding security and confidentiality will be greatly improved. When designing the security mechanism of power data network, we should follow the following principles from the perspective of Engineering Technology: among them, the integrity principle of network information security system comprehensively considers the factors such as security protection, monitoring and emergency recovery. Because the security and confidentiality of network information can not be guaranteed, it is required that when the network is attacked and damaged, the service of the network information center must be restored as soon as possible to reduce losses. Therefore, the security protection mechanism, security monitoring mechanism and security recovery mechanism of information security system should be included. Principle 2: Barrel Principle of security and confidentiality; It is necessary to consider the balance and comprehensive security protection of network data and information. The cable identifier manufacturer believes that it is a necessary prerequisite for designing the information security system to fully, comprehensively and completely analyze, evaluate and detect the security vulnerabilities and security threats (including simulated attacks) of the system.
5 Reasons a Voltage Detector Pen Is Good for You
5 Reasons a Voltage Detector Pen Is Good for You
A voltage detector is a quick and inexpensive method to check the presence of voltage in an AC circuit, switch or socket without actually working with it. Also known as a voltage rod, rod, sniffer or pin, a voltage detector clings to a shirt pocket and beeps or glows when it detects voltage in a conductive part of the insulation.Voltage detectors are used to repair electrical circuits, detect live neutral wires and in other situations where you need to verify the presence of electric current. These types of voltage detectors are designed for the non-contact detection of electrical circuits in residential, commercial and industrial buildings. Random contact with live electrical conductors is no problem, and the detector evaluates the voltage level in the electrical safety category for which it is used.The voltage tester Klein Tools ET40 is ideal for checking regular electrical cables, door bell sockets, lights and other devices. It has functions for displaying positive and negative DC polarity and is able to detect DC voltage currents as low as 1.5 V. In addition to detecting standard voltages and low voltages, voltage detectors and LED testers can also detect rated voltages.A good voltage tester not only saves you time, but also gives you the certainty that your electricity prices are normal. The best voltage detector pins operate in a wide voltage range and are able to provide acoustic and acoustic feedback when detecting voltage. They are small enough to be transported and provide a precise reading that tells the user whether voltage is present or not.Reinforced electronic testers (also called electrical testers, pins and voltage detectors) rely on capacitive currents to detect changes in the electric field of an energy-charged object. Non-contact voltage testers (test pins, voltage sensors, voltage testers and pins they know) are the safest way to ensure that an electrical conductor has no voltage without touching it or suffering an electric shock. They work by detecting changes in an electric field surrounding an object conducting alternating or alternating current.Non-contact testers allow you to check the voltage of a wire or device without having to touch the wire or part. A voltage tester can be used to test the presence of voltage when a multimeter cannot detect it and to measure and display the exact amount of available voltage. These testers are designed to detect the main voltage and do not provide any indication of low voltage control circuits used in the bells or HVAC controls.A further limitation is that DC voltage can not be detected with this method because DC currents do not flow in a uniform state through capacitors and non-contact testers that detect electrical fields cannot be activated. You cannot detect voltage through shielded or armoured cables, and this is a basic limitation due to the Faraday cage effect. A TONG or AMmeter detects changes in magnetic fields, while a detector uses current flowing through the wire in question, and it senses alternating electric fields emitted by AC conductors.Given the variety of products in the contactless voltage tester category, you can expect different types of NCVTs, but you can imagine that there are more contactless DC voltage testers and contactless DC voltage testers than there are regular DC testers on the market. Remember to use a quality insulation resistance tester when you need to measure the insulation around your circuit. You want a non-contact voltage tester that comes with a hook so that you can put it in your shirt pocket.I call it the voltage sniffer, but the technical name for it is the capacitive voltage sensor. It is supplied with an alligator clip, which is interchangeable with test cables, and a holster to keep it handy. It uses black magic to determine whether wires are live or not, and it is 100% reliable at all times.
Voltage Detector Pen: a History of Voltage Detector Pen
Voltage Detector Pen: a History of Voltage Detector Pen
The tester is designed to detect the main voltage and does not provide any indication of low voltage control circuits as used in doorbells and HVAC controls. A voltage detector is used to detect sockets, power supplies and insulated wiring. Unlike a tonne or an ammeter, which detects changes in a magnetic field, a detector uses the current flowing through the wire in question as it detects alternating electric fields emitted by the AC conductors.In order to reduce the potential for false alarms on low voltage devices, I recommend inspectors to use a voltage tester starting at 90 volts. I don't buy voltage sniffers that run on button batteries because they're hard to find.It costs a little more than most other voltage sniffers, but it's worth the price. I've had it for three years and it's the most reliable and robust non-contact electrical tester I've ever owned. The non-contact voltage tester is a great voltage tester that can be called Fluke, and is characterized by a compact design that is easy to use.A good voltage tester should be small enough to carry and provide an accurate measurement that tells the user whether voltage is present or not. Each time you use the tester, voltage sniffer manufacturers recommend testing with a known power source to ensure proper function.To use a non-contact voltage tester, touch the tip of the tester with the wire you test with the socket and the tip must be placed with a small slot on the front panel. Manufacturers of voltage sniffers also recommend holding a tester with bare hands and keeping it close to the body. Fluke 1AC-II Non-Contact Voltage Test Tip: A bright red beep that sounds when voltage is detected.The invention of the non-contact voltage tester described above is a kind of voltage indicator that produces a signal of limited duration when the operator switches on to turn the tester on, which is operated by the user when no voltage at the probe tip is detected. The signal tells the operator that the battery is on, indicating that the device has a light or sound source at work. The use of voltage testers consists of touching one probe on a wire connection and the other probe on the opposite wire connection.Under certain circumstances, the voltage sniffer may not be able to detect the current if you do not hold it down, as shown in the following clip. In the United States, the Consumer Product Safety Commission states that the button can remain pressed during a power-to-power cycle, causing the tester to work incorrectly.Voltage is the potential difference between the two conductors and the ground. Measured as voltage in phase, a phase of zero volts indicates that the two energized conductors are in the same phase.The reading is the product of the current flowing through the circuit and is calibrated to read the voltage in kilovolts. The test lamp, the test light or the main test meter is an electronic tester used to determine the presence of electricity in the device under test. A test light is a simple but expensive measuring instrument, such as a multimeter, which is sufficient to check the presence of a voltage in a conductor.Choose a detector that displays the power level with an acoustic, visual or vibrating signal. Find a variety of Grainger voltage detectors to test battery and circuit integrity.CAP-40 houses the battery [41], which supplies the voltage detector circuit with energy (Fig. The additional energy from the lamp and the power amplifier is supplied by a small internal battery that does not flow through the user's body.The socket tester is about the size of an electrical plug and works by plugging it into the socket. They have grooves that hook into the surrounding wires and detect the voltage of the lead wire at the point where the tester checks the contact with the socket. The tester can test voltage and polarity and check the outlet wire, but it is not able to test the circuit directly at the outlet itself.Techineer is not responsible for any import duties or taxes, including VAT, that occur when a shipment reaches your destination country, and these are only your responsibility as a customer.We approach each case on a case-by-case basis and try our best to find a satisfactory solution. After talking to a 20-year veteran electrician and testing seven leading models for eight months we found that the Klein NCVT-3 was the best model.
Why CCTV Monitor Testers Is the Better of the Other
Why CCTV Monitor Testers Is the Better of the Other
CCV testers, also known as LCD field monitors or CCTV field monitors, provide installers with an ideal solution that allows them to view, calibrate and correct the camera's video feed in real time based on the additional features that they provide. The basic feature of a CCTV tester is an LCD display (25 inch x 3.5 inch diagonal) that allows the installer to view a camera feed on the spot. If the camera is set up in a separate area, the installer must run the feed to refine the settings.Other features of video calibration include video test patterns, the brightness, contrast and saturation adjustment, video signal intensity testing and support for PAL and NTSC video. Another aspect of the functionality that should not be overlooked by a CCTV tester is the ability to work with analog and IP cameras.If you are a professional installer, you probably have heard of closed circuit television testers (also called LCD field monitors, CCTV video testers, CCTV camera testers or IP camera testers). The ability of CCTV testers to work with both analogue and IP cameras is particularly important as digital surveillance cameras become increasingly popular. A closed circuit TV tester is a handy tool for professional CCTV installers and do-it-yourselfers to set up and configure CCTV cameras from any source.NKTech's 3.5-inch CCTV Tester is a portable device designed to install and maintain existing on-site CCTV video surveillance systems. The 1920x1200 resolution allows the 5-inch touchscreen IP camera tester to display network HD cameras and high resolution analog cameras. As with all our CCTV test monitors, we offer a one-year warranty of CCTV Camera Pro.All three options can be used together, but there is a higher tendency for IP camera systems than for digital video cameras. IP cameras have the ability to contain more cameras than one to cover wide angles captured by multiple cameras and camera systems to cover everything.The warranty does not cover operating system errors caused by third-party apps. On the Software Update screen, select Manual Updates and select Apps to Update. All features, including apps installed since the last factory reset, can be removed.Send your physical sample copy of your Dreiklang order to the address above. This allows you to store your videos in the cloud with EUFy's own subscription storage plan. For 10 days cloud video storage for a camera, you need to subscribe to a 200GB iCloud storage plan for $3 a month.Prisons use video surveillance to prevent drones from selling drugs and other contraband to prisoners. Disaster management uses CCTV cameras to allow emergency services and responders to assess and monitor events in real time and video the situation to the disaster management team.The CCV technology was first developed in 1942 by German scientists to monitor the launch of the V2 rocket. With road surveillance cameras and traffic lights, cities can monitor people, collect traffic statistics, evidence and speed. The legacy of the IoT (AOT) is the Chicago Initiative, which collects real-time weather and environmental data in Chicago.It is essential to constantly clean, pre-test and calibrate CCTV testers. To ensure accurate testing, it is important to study CCTV systems and conduct tests with tools that measure the performance of multiple indicators. A man on a ladder who manipulates a camera not only walks around, he measures the video signal and evaluates the running camera.This is a quick test for the effect of measuring the input and output video signal by examining a device. The same man who climbs a ladder and manipulates a camera can also do so with other video devices such as video splitters, disconnectors, switches, route switches, cable connectors, etc.With this connector we can connect the camera to its output and check the level of the video signal. It's a handy solution for men who have a ladder to manipulate the camera. You can connect the cable to the LED cable of the monitor to check the signal.Contrary to the impression, the 1.2V voltage causes many problems when we supply the camera with a long cable. The voltage loss caused by the greater resistance of the cable reduces the value of the camera clamp and interferes with proper operation.A tester with a USB port can charge mobile devices, but does not have a data interface. Android devices, mobile phones and tablets do not support hosting of USB sticks.As soon as the power switch is in position, press the power button to switch the tester to off mode and dim the backlight. The tester wakes up when the button is pressed. When the power switches are pressed and held down, the button selects the option Turn off to shut down the device.Brush - I could use two brass rods and a set of adapters for different brush sizes on a children's apron suitable for children 3-7 years. Bust 40, "Waist 38," Length 19 "(if you have smaller or larger sizes) Girl Nautical Miss Crab Fabric Personalized Crab.Note the handmade texture of the piece using hand stamping techniques using butterflies, butterfly cookie cutters, sunflowers and sugar. Hand cut and polished for participation in 2 Mineralogical exhibitions in Finland and Sweden, this is one favorite piece of ours that will be brought with you by Etsy if you wish a shipping offer for the purchase. The buyer of IP camera test equipment writes: "It is worth every penny.CCTV testers feature a colour LCD screen, video connection, rechargeable lithium batteries and several types of colour bars for signal output. A shopper who bought a CCTV camera tester used it to test his camera before he started installing it in his home.
The Basics of Using the CCTV Monitor Testers
The Basics of Using the CCTV Monitor Testers
Our security camera testers are designed to facilitate the installation, maintenance and testing of security cameras. All our CCTV test monitors are backed by a 1 year warranty from CCTV Camera Pro.CCV safety tester is a kind of multifunction test tool for CCTV security camera installation professionals. A CCTV tester (short for closed circuit television tester) is a tester and monitor that supports the installation and installation of CCTV security systems. It is used to check if the configured CCTV camera is in the right place, at the right angle, with free view and more.A CCTV tester can be used to display video, control the PTZ, generate images and acquire data from the RS485 test LAN cable. It also has a multi-meter feature to provide AC / DC voltage and resistance measurements to provide the installer with additional diagnostic capabilities to locate localized faults.The CCTV tester analyzes the video signal and displays peak, average video signal level, synchronization and pulse levels to determine the optimum level to display the best picture and synchronization to avoid cable loss. A multifunction tester can save you time and money on your next CCTV installation. In order to ensure accurate testing, it is important to study the CCTV system thoroughly and carry out a test with a tool that measures the performance of several indicators.Once the camera is set up in a separate area, the installer must run a video feed from the camera to refine the settings. Not only do you see the camera video and adjust the focus of the variofocal lens, you also have to supply the camera with its lithium-ion battery. This means a ride up and down the ladder to mount the camera, test the cables and adjust the settings.CCV testers, also known as LCD field monitors or CCTV field monitors, provide installers with an ideal solution that allows them to view, calibrate and correct the video feed of the camera in real time based on the additional features they provide. The basic features of a CCTV tester are an LCD screen (2.5 inch x 3.5 inch x 0.5 inch diagonal) that allows the installer to display a camera feed in place. Other features for video calibration include video test patterns, brightness, contrast and saturation adjustment, video test of signal intensity and support for PAL and NTSC video.The built-in 24-inch TFT LCD display enables the display and adjustment of camera settings and functions. The display monitor can also be connected to a DVR display to allow viewing of a CCTV camera with multiple cameras. The closed-circuit TV tester is a handy tool for professional installers of CCTV security systems and do-it-yourselfers to set up and configure a CCTV camera source.The NKTech 35-inch CCTV tester is a portable device designed to install and maintain existing on-site CCTV video surveillance systems. If you are a professional installer, you may have heard of closed circuit TV testing (also known as IP camera testers, CCTV video / LCD field monitors, CCTV camera testers or IP / CCTV camera testers ).The device can be used for TVI cameras as well as cameras in HD, SDI cameras and network IP cameras. IP cameras have the ability to record more than one camera and cover a wider angle, and can record multiple cameras so that the camera system is covered. The CCTV tester is handheld for good reason, it is for installation and convenience.Prisons use video surveillance to prevent drones from delivering drugs and other contraband to prisoners. Video encoders enable migration from an analog CCTV system to a network system, allowing users to take advantage of cheaper hardware with advanced features. There are three possibilities, which are used with high tendency: IP camera systems, digital video cameras or both.Perform real-time camera settings such as focus, zoom, optimization of advanced settings such as BLC, send-up, lighting adjustment, etc. Disaster management uses CCTV cameras for emergency services and responders to assess and monitor events in real time and report the situation to the disaster management team via video. City and community streets monitor cameras and traffic lights in cities to monitor people, collect traffic statistics, evidence and speed.A CCTV tester is a portable handheld service monitor that helps installers configure the camera at the touch of a finger. Market-buying reviewers looking for a video tester or an IP camera monitor kit can get an angle on where the camera is set up and how it should work. A shopper who bought a CCTV camera tester used it to test his camera before he started installing it in his home.The completion of the CAPTCHA proves that you are a human being and gives you temporary access to the web property. It takes 10-25 working days at best, and I cannot keep it in stock according to your order quantity. Your order has been put on hold for 14 days while we await the Woods trial.
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.
Cable Fault Detector_ Medical Devices Will Maintain High Growth in the Coming Years
Cable Fault Detector_ Medical Devices Will Maintain High Growth in the Coming Years
The medical and pharmaceutical chamber of Commerce of the all China Federation of industry and Commerce established the medical device Professional Committee yesterday and issued the 2012 analysis statement of the medical device industry. The statement shows that the dependence of some domestic high-end medical equipment markets on imports has decreased slowly last year. According to the deployment of deepening medical reform and the spirit of the 2012 national health work conference, the statement implies that China's medical device industry achieved a total sales revenue of 68.7 billion yuan in the first half of 2012, a year-on-year increase of 20.27%, The overall requirements of this year's work are: closely focus on the central task of deepening medical reform. It is predicted that China's medical devices will maintain rapid growth in the next 5-10 years, and the industry as a whole will maintain a growth rate of more than 20%. Among them, the focus is on food safety, occupational disease prevention and drinking water safety. According to the statistics of the statement, at present, although the number of medical device enterprises across the country has reached more than 14000, the competition pattern of the medical device industry is relatively scattered. In 2012, the food safety and health supervision of the health system should pay close attention to the following aspects: first, do a good job in food safety, More than 80% of them are small and medium-sized enterprises. The scale of enterprises is small, and there are problems such as insufficient R & D investment and weak technical ability. Because of fierce competition and low profitability, enterprises can only produce medium and low-end products or provide spare parts for foreign enterprises. " The head of the association hinted.
Detection Method of Power Cable Fault
Detection Method of Power Cable Fault
1. Rough measurement of power cable fault (1) bridge method bridge method is a classical method of power cable fault location, which has a long history. Including DC resistance bridge method, DC high voltage resistance bridge method and capacitance bridge method. The resistance bridge method can only test some cable faults with low insulation resistance between single phase and ground or between two phases; High voltage bridge method is mainly used to test single-phase grounding fault or phase to phase and ground fault of main insulation with resistance greater than 10k Ω but less than megohm; The capacitance bridge method is mainly used to test the open circuit and broken wire fault of cables. The bridge method is relatively simple and convenient to operate, but it needs to know the original data such as the accurate length of the cable in advance. At the same time, it is not suitable for detecting high resistance faults. Most of the actual power cable faults are high resistance faults. Because the bridge current is very small when the fault resistance is very high, it is difficult for general sensitive instruments to detect. (2) Traveling wave method 1) low voltage pulse method low voltage pulse method is mainly used to measure the fault distance of open circuit, short circuit and low resistance faults of cables; At the same time, it can also be used to measure the cable length, wave velocity and identify and locate the middle head, T-joint and terminal head of the cable. Test principle: input a low-voltage pulse signal from the test end to the cable, and the pulse signal propagates along the cable. When encountering the impedance mismatch point in the cable, such as open circuit point, short circuit point, low resistance fault point, etc., a reflected pulse will be generated. The position of the fault point is calculated according to the round-trip time difference DT between the reflected pulse and the transmitted pulse and the pulse propagation speed v. 2) High voltage pulse method high voltage pulse method uses high voltage signal to turn cable fault into short circuit or low resistance fault instantly, so that the reflection coefficient of fault point is close to - 1, and the fault point almost produces total reflection. There are usually two basic flashover methods, namely direct flashover method and impulse flashover method. When testing cable fault by flashover method, the reflected wave formed at the cable fault point is high-voltage pulse wave, which cannot be displayed directly through the instrument. Generally, a sampler is needed to convert the high-voltage pulse formed at the fault point under the action of high voltage into the low-voltage pulse signal required by the instrument. According to different sampling methods, it is divided into voltage method, current method and voltage induction method. Wherein, R1 is the voltage dividing resistance, R2 is the sampling resistance, LP is the current sampler, C is the energy storage capacitor and B is the transformer. DC high voltage flashover method (direct flashover method): apply DC voltage to the fault cable to make the fault click through the room for discharge and flashover. Then, the fault distance can be calculated according to the transmission speed V of the traveling wave in the cable. The direct flash method is mainly used to test the flashover high resistance fault of power cable, and can also be used to test the leakage high resistance fault with particularly high resistance but lower resistance compared with the intact phase. Figure 6 shows the principle circuit of direct flash test. Impulse high voltage flashover method (impulse flashover method): due to the large equivalent internal resistance of DC high voltage power supply used in direct flashover method, the power output power is limited to a certain extent. For most leakage high resistance faults, direct flashover method cannot be tested. The impulse flashover method uses the high-capacity charging capacitor as the DC high-voltage power supply, which is connected to the fault cable to cause the flashover and discharge at the fault point to form an instantaneous short circuit. It is mainly used to test the leakage high resistance fault of power cable, and can also be used to test the low resistance, open circuit and flashover high resistance fault of power cable. The test principle circuit is basically the same as that of the direct flash method, except that a spherical gap is inserted between the energy storage capacitor and the cable, as shown in Figure 7. 2. Precise measurement of power cable fault point (1) acoustic measurement method uses the sound wave generated when the fault point is discharged for fixed point. The sound sensor detects the sound signal above the power cable. The place with loud sound is the location of the fault point. The farther away from the fault point, the smaller the vibration sound. (2) When the fault point flashover discharges under the action of impulse voltage, the acoustic magnetic synchronization method receives the electromagnetic wave and vibration sound wave generated by the discharge of the fault point at the same time, and judges whether the measured signal is generated by the discharge of the fault point to accurately judge the location of the fault point. (3) The audio induction method adds a certain power low-voltage audio signal to the fault of the cable at one end of the tested circuit. When the tested signal is transmitted to the short-circuit or disconnection point, it cannot continue to transmit along the cable, so there will be obvious signal size changes on both sides of the cable fault point. If the signal changes are detected through the receiver above the cable path, The location of the fault point can be determined. At the same time, the accuracy and integrity of various basic data of cables are also very important to improve the efficiency of fault point finding, such as cable laying direction, total cable length, distribution of cable intermediate joints, etc.
When Purchasing a Cable Fault Tester, Pay Attention to These Points to Avoid Entering the Pit
When Purchasing a Cable Fault Tester, Pay Attention to These Points to Avoid Entering the Pit
. the cable fault tester is an important tool for the power part to maintain the normal operation of the cable. It helps the power staff quickly reach the fault point and eliminate the fault in time, so as to ensure the normal operation and smoothness of the cable. Many people have introduced cable fault flashover and Gaozu fault, so pay attention to these points when buying to easily help you avoid stepping on the pit 1. You can't just look at the price, because what you need is an efficient and accurate testing equipment with perfect supporting after-sales service and pre-sales technical service guidance. These should be communicated and determined before purchase. It is worth paying attention to the details such as the list of accessories when the equipment leaves the factory, the use and installation after receiving, whether relevant technicians come to the site for guidance, or whether the use video is provided. The selection of cable fault detection equipment manufacturers is guaranteed. 2. Define your needs. This is to clarify the key parameters of the type and model of fault detection equipment you buy according to the scope of your use. The application scope of power cable fault test is relatively wide. It is compared with the communication cable fault tester, which is used to detect the fault point of communication cable. Many buyers, or purchasing departments, especially some power departments, are separated from the user department and the purchasing department. It is found that many remain unchanged in use, or even have no after-sales service at all. In fact, the basic principles of cable fault tester are almost the same, but the real competition is the service and product quality itself. I hope you can choose a cost-effective power fault detection equipment from the details when purchasing.
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