Cat5e Cable Tracer Buying Guide

Cat5e Cable Tracer Buying Guide

2021-10-24
NOYAFA
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Functions of Professional Cable Identifier
Functions of Professional Cable Identifier
In order to quickly and accurately identify a specific cable from a bundle of cables, special instruments are needed, such as professional cable identification instrument. It is a compact instrument with relatively simple operation. So, what other functions should the cable identifier have? This is what Xiaobian wants to discuss with you today. Cable identification instrument is a special instrument used to identify a specific cable from a bundle of cables. It is a compact instrument, which is installed in an aluminum alloy box and consists of a signal generator, a receiver with sensor and wiring. In order to identify the cable reliably and accurately, it is necessary 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 generator feeds periodic unipolar voltage pulses into the cable to be identified, which needs to be grounded at the far end to ensure that a large enough current flows through the cable. The system shall be designed so that the return current does not return from the same cable. This can be achieved. The direction of the pulse current fed into the cable can be used as an obvious identification standard. The outgoing current only passes through this cable, and all other adjacent cables flow through the return current, but their polarity is opposite. In addition to the actual difference in current direction, the current amplitude is also an identification feature. The outgoing current only passes through one cable, while the return current can pass through several cables, which means that the outgoing current is greater than the return current flowing through other cables. The task of the receiver is to detect the direction and magnitude of the current flowing through the cable. In order to achieve this purpose, the current sensor is used as a sensor, which 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 polarity of the voltage is determined by the current direction and the direction of the sensor coil. In order to obtain the voltage polarity with obvious current direction, all cables in a bundle shall be tested in the same correct direction. The voltage induced in the sensor coil is displayed in the meter. If the sensor is connected in the above way, the pointer swing direction can display the current direction, that is, only the cable with current flowing out deviates to one side, and this is the cable to be found. All other cables only flow return current, the pointer deviates to the other side, or there is no pulsating current, and the pointer does not deflect. The amplifier regulator on the receiver can adjust the signal strength. What we need for professional cable identification instrument is, on the one hand, of course, to have good accuracy. If the accuracy is not enough, we will use it in vain. If it is not accurate, it will affect the later stage. In addition to accuracy, it is necessary to ensure the service life. When an ordinary voltage current ratio meter type grounding resistance meter (commonly known as grounding megger) is used to measure the grounding resistance, the grounding device passing through the tower shall separate the grounding down lead from the tower for measurement; Through the grounding device of non prestressed reinforced concrete pole, the measurement shall be carried out after the grounding down lead is separated from the lightning conductor from the top of the pole. In the initial state of the system, press the setting key of the DC resistance tester to enter the setting function state, set the material option to unknown, set the measurement mode to resistance, set the working mode to standard, set the measurement speed to standard, and press the return key to return to the initial state of the system.
Working Principle of Cable Fault Tester
Working Principle of Cable Fault Tester
Working principle of 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 exact 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 wire core completely short circuited to 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 the simplest low-voltage pulse short-circuit fault waveform, so the interpretation is very simple and the fault distance can be accurately calibrated. The triple 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. The triple 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 third pulse method is an upgrade of the second 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.
Correct Opening Method of Cable Fault Tester
Correct Opening Method of Cable Fault Tester
Why can't the fault point be found when using the cable fault tester? What is the correct opening method of cable fault tester? We need to understand some common problems of cable fault first, and then effectively solve the fault problems according to different problems. With the development of China's power system, the laying of high-voltage cables is becoming more and more common. Basically, the cables connected between distribution stations are very long. As long as the cables fail, it is very difficult to troubleshoot, and most of them are buried cables, which is difficult to judge. At this time, we need a cable fault tester to judge the correct fault point for us, So that we can quickly restore the power supply, we can analyze the problem according to several common cable faults. Cable faults are commonly divided into high resistance short circuit fault, phase to phase short circuit fault, low resistance fault, flashover fault and other common faults on site. 1. The low voltage pulse reflection method is applicable to low resistance (less than 10 times of wave impedance), grounding and open circuit faults, and can test the full length of the cable and the propagation speed of radio waves in the cable. In case of low resistance or grounding fault of the cable, the equivalent impedance at the cable fault point shall be the parallel connection of fault resistance and cable characteristic impedance. The smaller the cable fault resistance is, the more obvious the reflected waveform is. When the cable fault resistance is zero, it is total reflection. Because the equivalent impedance at the test end (input impedance of the test instrument) is greater than the characteristic impedance of the cable, the same polarity reflection pulse is generated at the test end. At the low resistance or ground fault, because the fault resistance is less than the cable characteristic impedance, the incident pulse generates the reverse polarity pulse after the fault point and transmits it to the test end. The falling edge of the received reverse polarity pulse corresponds to the reflected waveform of the cable fault point. In case of open circuit fault of cable, the equivalent impedance of cable fault is the series of fault resistance and cable characteristic impedance. Open circuit is equivalent to infinite fault resistance. In this case, the incident pulse will form total reflection, and the reflection pulse of the same polarity will be generated at the test end. The rising edge of the received pulse of the same polarity corresponds to the reflection waveform at the fault point. 2. First, use a certain voltage level The high voltage pulse with certain energy is applied to the faulty cable at the test end of the cable, causing breakdown and arcing at the high resistance fault point of the cable. 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 wire core completely short circuited to 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 cable 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 cable fault point. Compared with the traditional cable fault test method, the advantage of the secondary pulse method is to simplify the complex waveform in the impulse high-voltage flashover method into the low-voltage pulse short-circuit fault waveform, so the interpretation is very simple and the fault distance can be accurately calibrated. 3. The triple 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. The triple 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 third pulse method is an upgrade of the second 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 find the fault point waveform than the secondary pulse method. The cable fault tester often has to solve the following problems: 1. The diversity and complexity of cable faults determine that the cable fault tester needs complete functions and diverse test methods. 2. 2. To solve the fault, many instruments should be used together in order to achieve the result of solving the fault. 3. Different test methods are needed for cable insulation, fault location and different faults. 4. Sometimes the difficulty of cable fault test lies in the snow with a thickness of more than one meter and bad weather (the temperature is more than minus 20 degrees), which is also a test for underground cable detectors and testers to pass the above understanding. I believe you basically have some general and judgment on the cable fault problem and how to use the cable fault tester normally.
The Evolution of the Handheld Laser Measuring Device in China
The Evolution of the Handheld Laser Measuring Device in China
The Great Wall of China, the Taj Mahal, the Roman Colosseum and the pyramids are just some of the largest and small gauges in the world in critical buildings. The development and mastery of these tools has been crucial to the evolution of the human species. Laser pointers are also used in robotics, for example, laser guidance guides a robot into a target position using a laser beam. Green laser pointers are used for similar purposes in daylight and over long distances. Another common use of lasers in entertainment is the special effects used in laser shows. Clubs, parties and outdoor concerts often use high-power lasers as security for the spectacle. For example, construction companies use high-quality laser pointers to increase the accuracy of displaying certain distances when working on large-scale projects. In astronomy, laser pointers can be mounted on a telescope to align the telescope at certain star locations. Green laser pointers are also used by astronomers for star parties or lectures on astronomy. Laser rangefinders have built-in processing capabilities that allow them to triangulate, calculate and measure distances, as well as calculate area and volume. They are accurate enough to measure long distances and display fast measurement results, compared to traditional bands used for measurement applications. With the various functions that digital handheld meters offer, the demand for these devices via tape increases. A major factor in the growth of hand-held laser rangefinders is the growing construction sector. Noyafa is committed to scientific and technological applications of laser detection. The growing demand for digital measuring instruments for precise measurements and the resulting growing demand for hand lasers and distance meters in the construction industry is a key factor in the growth of the market for hand lasers and distance meters worldwide. Measuring tools continue to evolve with technological advances such as lasers. With the development of mass production of integrated circuits (IC), the measuring tapes have become digital. This is different from 100-foot measuring tapes, which are made of fabric and used to mark the exterior dimensions of large buildings.
How to Select the Appropriate Cable Fault Tester
How to Select the Appropriate Cable Fault Tester
Cables bear the great responsibility of transmitting electric energy, so it is very important to ensure the normal use of cables. What if the cable fails? This requires the use of cable fault tester to find out the fault point, and then repaired by professional staff. Different types of equipment have different configurations, so how to select the appropriate cable fault tester? Let's have a look. As the cable fault types are divided into high resistance, low resistance, broken wire and composite faults, the cable fault detectors sold in the market are generally high and low voltage complete sets, including many components and accessories. A set of equipment components are as few as 5-6 pieces and as many as 10-11 pieces. As a cable manufacturer, it is necessary to timely locate and deal with various cable faults in the production process in the plant to ensure timely delivery of products; At the same time, we should also take into account the location of sudden cable faults after the cable laying at the customer's site or during operation. Therefore, as a cable manufacturer, when purchasing the cable fault detector, it is a complete set of high and low voltage purchase configuration, and the equipment components are 6-10 pieces. In case of direct buried cable fault location at the customer's site, the handling and transportation of the whole set of equipment must be transported by a special cable fault detection vehicle, otherwise the transportation quality of the instrument is not guaranteed. There are also some special cable fault detectors, such as the railway household coat cable fault detector. More specifically, it can be called the railway single core cable outer sheath fault tester. These two configured cable fault testers are suitable for railway. According to the characteristics of railway cable outer sheath fault, under the condition of separation of cable sheath and shielding layer, The bridge method or voltage drop method is used to initially measure the grounding fault of the cable outer sheath, and then cooperate with the special receiver to accurately find the fault point. The instrument has a built-in high-precision measurement unit. If there is a good auxiliary cable sheath, the fault is initially measured by the bridge method. Without moving the instrument to the opposite end, the test instrument can directly display the fault distance and realize rapid measurement. If there is no good auxiliary cable sheath, the fault distance of the outer sheath can also be calculated by testing both ends of the outer sheath of the faulty cable and using the resistance (voltage) comparison method, If the resistance value of the sheath per kilometer is known, the fault distance of the outer sheath can be calculated through the single end voltage drop test of the outer sheath of the faulty cable. The outer sheath transmitter and the fixed-point receiver can realize the accurate fixed-point of cable sheath grounding fault. At present, the cable fault detectors sold on the market are mainly divided into two types: one is the cable fault detector designed according to the principle of echo method: the components mainly include intelligent waveform detection analyzer, Pathfinder, DC high-voltage generator (including console and AC / DC dual-purpose high-voltage test transformer), capacitance, ball gap, pointing instrument, etc. The second is a cable fault detector designed and manufactured according to the principle of bridge method: the components mainly include fault location bridge (high and low voltage bridge), pointing instrument, path instrument, wave reflection fault location instrument, etc.
What Should We Pay Attention to When Using Live Cable Identifier
What Should We Pay Attention to When Using Live Cable Identifier
The emergence of electricity has broken people's original lighting mode and provided us with a convenient and comfortable living environment. Cable has the function of transmitting electric energy and plays a very important role in life. The demand for electricity is so great that sometimes the cable will inevitably have problems. Live cable identification instrument is one of the commonly used fault detection equipment. 1. The operator shall read the operation manual in advance, master the function, working method and work preparation of the instrument, and carry out correct test requirements. 2. Before the test, disconnect both ends of the tested wire with armored grounding, and ground the far end (one end) of the core wire. 3. The two output wires of the cable identifier shall be clamped in red on the core wire of the tested wire and grounded in black. 4. Before turning on the transmitter, the output adjustment knob must be turned counterclockwise to zero before starting. Slowly adjust the output adjustment knob to make the output reach 5a-15a (usually adjust the adjustment knob in the range of two-thirds). If the grounding resistance of the distribution station system is greater than 4 ohms, the output current is less than 8a, and the receiver instrument head can work normally, as long as it can deflect in the positive and negative directions. 5. Note: during field use, if the grounding resistance is too small and the output adjustment knob of the transmitter is zero in one clock cycle, the output current will be very large, and there is a protective circuit action in the transmitter (indicating a small swing of the plug). In Article 2, in the actual test, there are more than two connections between the two transformer chambers between the same cable conduit and other cables, The grounding resistance is connected because there are other armored cables in operation, and the change is very small, even close to zero. If the output current of the transmitter is too large and there is a protection circuit, the resistance can be tested in series in the transmitter loop test. After the test, the temperature of the test resistance is very high. Note that other 1-2 ohm resistors greater than 20W can also be used instead of the test resistance. 6. Before identifying the cable on site, please calibrate the receiver of the live cable identification instrument at the beginning of the wire according to the instrument calibration requirements in the instruction manual. 7. Standard for cable field identification: when the sensor is pasted on one of the cables for test, the header of the receiver will lean to one side and swing more. When testing on other cables (keeping the clamping direction of the sensor the same), the receiver instrument head will lean to the other side and swing less. The cable with the receiver instrument head leaning to one side and swinging sharply is the cable to be identified.
Analysis on Fault Location Mode of Power Cable
Analysis on Fault Location Mode of Power Cable
Cable faults also occur in the process of cable laying. Due to different cable laying methods, the difficulty of cable fault location increases gradually. Among them, the positioning of bridge, tunnel and groove is relatively simple, and the direct buried positioning is relatively difficult. Generally, a special cable fault location device (also known as cable fault tester) is used, which can be located in dozens of minutes, Special faults often take 4-5 days or even longer to locate. Now let's analyze the fault location mode of power cable. When using echo method to locate power cable fault, sometimes by transferring fault phase and wiring mode, complex fault will often be transformed into simple fault to quickly determine fault location. It is of great significance for the power supply user department to win time for the emergency repair of on-site lines. Low voltage power cables are generally multi-core cables. When faults occur in continuous use after laying, they generally show two core and multi-core phase to phase or phase to ground short circuit faults. Sometimes when it is detected that the fault waveform collected by one core is not ideal, it can be considered to convert the wiring to other fault cores for fault waveform detection, which often has unexpected effects, The collected and detected waveforms will become more typical and regular, so the specific location of cable fault point can be determined quickly. During the long-term on-site measurement of cable customers, it is found that the fault of small section copper core directly buried power cable (35mm2 and below) and aluminum core cable may be accompanied by short circuit and wire breakage at the same time. During on-site detection, converting short-circuit fault into broken line fault measurement according to the different fault nature of each fault core will often double everything with half the effort. For the medium voltage direct buried power cable with extruded armor as the inner lining, the fault is mostly caused by external mechanical damage. When the insulation core fails, the inner lining may have been damaged. When the cable insulation fault is special and it is difficult to collect the waveform with a professional cable fault tester, the acoustic method can be considered, When the high voltage pulse is directly applied between the steel strip and copper shielding layer of the cable, it will often be fixed quickly. In the field measurement process, we also found that when using the acoustic method to locate the fault point of low-voltage cable. When the high-voltage line and ground wire are connected between the bad phase and the metal shield or armor, due to the low resistance metal connection state of the insulation resistance of the two, the sound is very small, so the probe can not be used to listen to the fixed point, and the effect is not ideal. Through the actual listening side on the site for many times, it is found that the distance between the discharge ball gaps is appropriately increased. At the same time, if the high voltage and grounding wire are connected between the two faulty phases, the discharge sound will become louder and the fault point will be determined quickly.
Configuration and Management of Cable Fault Tester
Configuration and Management of Cable Fault Tester
With the development of the times, the use of electricity has also developed. Now electricity is everywhere around us. Electricity is transmitted to various places through cables, which provides great convenience for our life and work. Subsequently, the production of cables is becoming more and more perfect, and the types of instruments used to detect cables - cable fault tester are becoming more and more abundant. Today, let's talk about the configuration and management of cable fault tester. With the production scale, type and sales volume of cable manufacturers increasing year by year. As the cable fault is divided into high resistance value, low resistance value, broken line fault and composite fault, the cable fault tester sold on the market is generally configured in sets of high and low voltage, including many components and accessories. A set of equipment components are as few as 5-6 pieces and as many as 10-11 pieces. As a cable manufacturer, it is necessary to timely locate and deal with various cable faults in the factory production process to ensure the timely delivery of products; At the same time, it is also necessary to consider the location of sudden cable faults after the cable laying at the customer's site or during operation. Therefore, as a cable manufacturer, when purchasing the cable fault tester, it mostly adopts the complete set of high and low voltage procurement configuration. In case of direct buried cable fault location at the customer's site, the handling and transportation of the complete set of equipment must be transported by a special cable fault detection vehicle to ensure the quality of transportation. At present, the cable fault testers sold on the market are mainly divided into two categories. One is the cable fault tester designed based on the principle of echo method: mainly including intelligent waveform detection analyzer, conductor instrument and DC high-voltage generator, including console and DC dual-purpose high-voltage test transformer, electric container, ball gap, pointing instrument, etc. The other is a cable fault tester designed and manufactured according to the principle of electric bridge method: the components mainly include fault locator, capacitor, ball gap, pointing instrument, etc. The above two instruments for detecting cable faults are both coarse side positioning part and accurate positioning part of cable faults. When used at the production site and customer service site, the cable fault tester often needs frequent transportation or long-distance transportation. In order to ensure the normal transportation and use of cable fault tester, the daily maintenance and management of cable fault tester is particularly important. At the same time, the actual use frequency of cable fault tester is not high. Therefore, the probability of equipment failure during transportation is not very high. Optical cable fault detector is a kind of precision and valuable equipment. In order to ensure the integrity of the actual use of the equipment, as a cable manufacturer who purchases and uses the cable fault tester, the actual use of the cable fault tester must be subject to daily maintenance and management, so as to give full play to its role at the critical moment of cable fault in production and customer site, Ensure timely delivery of products and rapid resolution of cable faults at customer site. The following suggestions are put forward for the daily maintenance and management of the cable fault tester: the user of the cable fault tester must receive professional training to ensure the safe use of the equipment and prevent damage and electric shock during the use of the equipment. Establish the equipment account for the use of cable fault tester, designate a special person for the use and management of cable fault tester, and have a proper fixed place for storage and management. Before using the cable fault tester every time, the quantity, integrity, user and service time of each component of the cable fault tester shall be strictly checked and recorded. File the equipment with a debit note. After the cable fault tester is returned to the factory or workshop for use, a secondary point inspection must be carried out. The number of points shall include the number of equipment and the number of all accessories. The integrity of the equipment shall be checked before acceptance. In case of equipment failure and missing accessories, it shall be handled in time, and the corresponding economic losses shall be investigated to ensure that the equipment is in good condition before use, And signed by the user and the manager for confirmation.
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