ഉൽപ്പന്ന ലിസ്റ്റ്
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ഇമെയിൽ:qiao@hvtest.cc
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Introduction to Series Resonance Knowledge
2024-12-16The series resonance under UHV power can help many power workers conduct various power tests more conveniently.The series resonance test device is a series resonance test device that uses tuned inductance and load capacitance to generate power frequency series resonance and obtain power frequency test voltage. Series resonance consists of an isolation transformer, a frequency and voltage regulating power supply, an excitation transformer, a reactor, and a capacitive voltage divider. The capacitor and reactor of the test sample form a series resonant connection; The voltage divider is connected in parallel to the test sample to measure the resonant voltage on the test sample and provide an overvoltage protection signal; The frequency modulation power output is coupled to the series resonant circuit through an excitation transformer, providing excitation power for series resonance.working principleA device that uses tuned inductors and load capacitors to generate power frequency series r
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What are the tips for using a cable fault tester?
2024-12-13The cable fault tester under UHV power can help many power workers conduct various power tests more conveniently.Some techniques for cable fault location: Cable faults occur with the laying of cables, and with different cable laying methods, cable fault location becomes increasingly difficult. Among them, the open application mode for bridge, tunnel, and trench positioning search is relatively simple, while the direct buried mode positioning search is the most difficult. When the nature of the fault is relatively simple, a dedicated cable fault locator device can be used to locate the fault within tens of minutes. When the fault is special, it usually takes 4-5 days or even longer to locate the fault.When using the echo method to locate cable faults, sometimes by transferring the fault phase and wiring method, complex faults are often transformed into simple faults and the fault location is quickly determined. The procurement time for on-site line repair is of great significance to the
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Common problems and solutions of circuit breaker tester
2024-12-13The circuit breaker tester under UHV power can help many power workers conduct various power tests more conveniently.1. Check if the working power supply of the instrument has DC outputUse a multimeter to check the voltage of the working power supply provided by the instrument. If the voltage output is normal, perform other checks; If there is no voltage output, then:(1) The fuse on the operation control line is burnt out or the control line is damaged.Solution: Replace the fuse or reconnect the control wire.(2) The internal power supply of the instrument is damaged.Solution: Use the on-site switchgear to operate the power supply, using the "external triggering" method. At the same time, notify the purchasing equipment company to carry out repairs or provide backup instruments.2. The switch has a protective lock (such as SIEMENS/ABB)Solution: ① Conduct closing/opening tests using the internal power supply of the instrument. The lock must be unlocked, and on-site technicians or manufact
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Two main cable fault location methods and their working principles
2024-12-12The cable fault tester under UHV power can help many power workers conduct various power tests more conveniently.Before locating faults in underground cables, it is necessary to know the route of the cable. How to locate the fault if you do not know where the cable is? Sometimes, you may find a cable route map in the document (which is why every job requires a good document), but when you don't have a cable route map, you need to find and track it. Locating underground cables is not only necessary for discovering faults, but also for any possible excavation near the cable route. This article will explain the types of underground cable fault locators and their working methods.Basically, there are two main methods for cable positioning:Activity location: This method involves injecting specific frequency signals through a transmitter and tracking them through a receiver to locate specific lines/cables.Passive positioning: This method involves searching for unknown lines by detecting e
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Analysis of several common safety faults in HV and LV Switchgear Test Bench
2024-12-11The HV and LV Switchgear Test Bench under UHV Power can help many power workers conduct various power tests more conveniently.HV and LV Switchgear Test Bench is a very important electrical equipment in the power system. The deterioration of the operating status of switchgear is one of the reasons for power system failures. What are the causes of faults in high-voltage switchgear? Mainly occurs in insulation, conduction, and mechanical aspects.(1) Inaction or malfunctionThis type of fault is the most common fault in high-voltage switchgear, and its causes can be divided into two categories. One type is caused by mechanical faults in the operating mechanism and transmission system, manifested as mechanism jamming, component deformation, displacement or damage, loose and jammed opening and closing iron cores, loose shaft pins, tripping faults, etc. Caused by electrical control and auxiliary circuits, it manifests as poor contact of secondary wiring, loose terminals, wiring errors, mechani
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The difference between series resonance and parallel resonance
2024-12-11The series resonance under UHV power can help many power workers conduct various power tests more conveniently.Resonance is one of the most common phenomena in power systems. According to the different forms of harm caused by harmonic resonance, it can be divided into series resonance and parallel resonance. The former is prone to causing overvoltage phenomena. The latter can easily cause overcurrent injuries. Resonance can further exacerbate the distortion of voltage and current, and sometimes even cause damage to power equipment and connecting devices, leading to safety faults in the system.Series resonant deviceThe basic characteristic of a series resonant power supply system is the complex combination of inductors and components. When a node or branch of the system experiences nonlinear loads, it is easy to cause resonance in the system. When series resonance occurs, the impedance of the line is minimized, and when nonlinear loads appear at the nodes or branches of the system, the
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Reasons and prevention of partial discharge in transformers
2024-12-10The specialized production of partial discharge testers for UHV power can help many power workers conduct various power tests more conveniently.Partial discharge is mainly caused by high-voltage electrical engineering equipment such as transformers and transformers under the action of high voltage. Discharge occurs inside the insulation. For example, partial discharge only exists in the insulation area, and the insulation does not immediately pass through to form a complete breakdown or flashover, which is called partial discharge. The partial discharge is very weak and can be felt intuitively by humans. If neither the eyes nor the ears can detect it, only a sensitive partial discharge tester can detect it.The internal insulation of the transformer is subjected to the working voltage for a long time during operation, especially with the increase of voltage level, the electric field strength value of the insulation is very high. Weak insulation is prone to partial discharge. The reason
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Selection method and factors to be considered for experimental transformers
2024-12-10The professional production of high-voltage test transformers in UHV power can help many power workers conduct various power tests more conveniently.When selecting a test transformer, the following aspects should be considered:1) Test voltage. According to the requirements of the tested product, first select a suitable voltage test transformer, so that the rated voltage Un on the high voltage side of the test transformer is higher than the test voltage Us of the tested product. Secondly, check whether the low voltage side voltage required by the test transformer can match the on-site power supply voltage and voltage regulator.2) Test the current. The rated output current In of the test transformer should be greater than the current Is required by the tested product, that is, In>Is. The current required for testing a product can be estimated based on its capacitance, Is=UswCx, where Cx includes the capacitance of the test product and additional capacitance.3) Testing ability. Based on t
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Factors affecting the measurement results of automatic motion viscometer
2024-12-09The kinematic viscosity tester under the UHV power company can help many power workers conduct various power tests more conveniently.Kinematic viscosity is an important indicator of lubricating oil. What we need to do when purchasing is to use an automatic kinematic viscosity tester to measure the kinematic viscosity of lubricating oil. After multiple measurements, there is often a certain degree of error in the results., What are the factors that affect the measurement results of this instrument? Below is a detailed analysis of this issue for everyone, let's take a look together!1. Constant temperature and temperature control directly affect the results of viscosity measurement. When the temperature rises, the measurement results of the automatic motion viscosity tester are lower; The temperature decreases, resulting in higher viscosity measurement results. Therefore, it is necessary to carefully control the testing temperature to ensure that its temperature variation is within th
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How to choose a series resonance testing device?
2024-12-06The series resonance testing device under UHV power can help many power workers conduct various power tests more conveniently.The series resonance withstand voltage test device meets the requirements of the withstand voltage test regulations for primary electrical equipment in substations of 500kV and below. It can output high voltage and small current while meeting the testing conditions of low voltage and large current. Widely used in industries such as electricity (power supply units, power plants, substations), metallurgy, railways, petroleum, chemical engineering colleges and research institutesThe series resonant device mainly consists of a frequency converter controller, excitation transformer, high-voltage reactor, high-voltage voltage divider, etc. Variable frequency controllers are divided into two categories: consoles with 20kW and above, and suitcases with 20kW and below; It consists of a controller and a filter. The main function of a variable frequency controller is to pr
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What are the maintenance requirements for cable fault testers?
2024-12-06The cable fault tester under UHV power can help many power workers conduct various power tests more conveniently.1. Load monitoringMonitoring cable load can help us understand changes in cable load and analyze how cables work. Since overloading can seriously damage cables, the load on the cables should be measured and monitored regularly. Clamp on ammeter can be used to measure the load of cable lines. To avoid premature aging of cable insulation, the line voltage should not be too high - below 15% of the rated voltage.2. Temperature monitoringThe operation of cables is affected by the environment and heat dissipation. In addition, the temperature tends towards the early stages of the malfunction. Therefore, it is necessary to monitor the temperature of the cable.Use cable fault testing instruments to measure the temperature of cable sheaths, cable joints, and other components to prevent cable insulation from exceeding limits and extend cable life.The best time to measure cable tempera
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What are the causes of cable faults?
2024-12-05The cable fault tester under UHV power can help many power workers conduct various power tests more conveniently.What are the causes of underground cable failures?Nowadays, electricity has penetrated into people's lives, and power cable faults exist at any time; The factors that cause power cable failures are complex and varied. Here, after sorting and analyzing, the causes of underground power cable failures can be roughly summarized into the following categories:Firstly, poor design and manufacturing processesThe waterproof and electric field distribution design of the middle and terminal of the cable is not thorough, the material selection is improper, and it is not made according to the requirements of the regulations, all of which can cause cable head failure.Secondly, mechanical damageUsually, some mechanical damage is minor and did not cause a malfunction at the time. It takes several months or even years for the damage to develop into a malfunction. The main causes of mecha
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Introduction to Karl Fischer titration method
2024-12-05The trace moisture analyzer under UHV power can help many power workers conduct various power tests more conveniently.Karl Fischer titration (KF) is a method in analytical chemistry that uses Coulombic, volumetric, or oven titration to determine trace levels of water content in a sample.The Karl Fischer titration method is very popular because it has multiple practical advantages compared to other moisture determination methods, such as accuracy, speed, and selectivity. KF has selectivity towards water because the titration reaction itself consumes water. On the contrary, the measurement of quality loss during drying will detect the loss of any volatile substances. KF has high precision and accuracy, typically within 1% of available water, such as 3.00% displayed as 2.97-3.03%. KF response is linear and usually takes only a few minutes to complete. Therefore, using a calibrated 1% water standard for single point calibration is sufficient, and there is no need to calibrate the curve.Usi
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Capacity method and electric quantity method for trace moisture analyzer
2024-12-04The trace moisture analyzer under UHV power can help many power workers conduct various power tests more conveniently.The Karl Fischer volumetric method of the Karl Fischer moisture analyzer, also known as titration method, requires the following 5 steps for each sample measurement:1. First, inject a portion of the reagent into the titration cell.2. Titrate a portion of Karl Fischer reagent to achieve equilibrium.3. Inject the tested sample.4. Titrate Karl Fischer reagent into the titration cell again.5. Discharge fee liquid.The reagent should be replaced every time it is tested. This method converts the water content based on the amount of Karl Fischer reagent injected and the titration degree of the reagent, as Karl Fischer reagent is affected by factors such as environmental humidity, light, and sealing. Titration degree is constantly changing, leading to titration errors. During the measurement experiment, every time a measurement is made, the waste liquid from the previous measure
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Market Development of Cable Fault Testers
2024-12-03The cable fault tester under UHV power can help many power workers conduct various power tests more conveniently.With the development of the times, the use of electricity has also evolved. Nowadays, electricity is everywhere around us, and it is transmitted to various places through cables, providing great convenience for our lives and work. With the increasing production of cables, the types of instruments used to detect cable faults, such as cable fault testers, have become more diverse. Today, let's talk about the configuration and management of cable fault testers.With the increasing production scale, types, and sales volume of cable manufacturers year by year. Due to the classification of cable faults into high resistance, low resistance, wire breakage, and composite faults, the cable fault testers currently available on the market are generally equipped with high and low voltage sets, including a large number of components and accessories. A set of equipment components can ra
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Precautions for Oil Moisture Tester
2024-12-03The oil moisture tester under UHV power can help many power workers conduct various power tests more conveniently.The precautions for oil moisture testers are as follows:(1) System wide closure issue. The connection of the Karl Fischer reagent liquid circuit from the reagent bottle to the metering pump and then to the reaction tank must be tightened, otherwise reagent leakage will directly affect the detection results. Another unresolved issue is the delay in titration completion due to the absorption of Karl Fischer reagent during testing.(2) Accuracy of sampling. The calibration of Karl Fischer reagent requires 10 mg of water and the use of 10 μ l samplers as much as possible, which is not only accurate and fast, but also can prevent water droplet adhesion. Similarly, there are similar issues with the use of methanol reagents and ethyl esters. After disassembly, attention should be paid to shortening the opening time of the reaction tank as much as possible.(3) Adjust the magnetic st
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What preparations are needed in advance for series resonance?
2024-12-02The series resonance under UHV power can help many power workers conduct various power tests more conveniently.Due to the high overall value of series resonance (also known as AC withstand voltage testing equipment), more and more factories choose it when testing equipment. Of course, they also ask what needs to be done before using series resonance. The following two aspects are worth choosing.Before using series resonance, it is necessary to test its structure and circuit. As it has been placed for a period of time before using series resonance, there may be aging of the circuit or other minor faults. A timely and comprehensive test can determine whether the series resonance is normal and whether it can maintain a stable personality during use. Think about it, if a series resonant circuit that has been idle for a long time ages and no problems are detected during assembly, it will definitely affect the functionality of the entire electronic equipment and cause a lot of trouble during
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Oil Open Cup Flash Point Analyzer
2024-11-29The oil open cup flash point tester under UHV power can help many power workers conduct various power tests more conveniently.Flash Point Tester A flash point tester is an instrument used to determine the flash point of a sample, which is the temperature point at which the sample vaporizes into another combustible component state in air. At that moment, the flash point meter can determine and measure the vapor pressure changes that occur, also known as the minimum flammability limit. Therefore, the steam concentration can be determined by temperature. There are two main types of flash point analyzers: open cup flash point testers and closed cup flash point testers. Open design aims to simulate open and natural environments, while closed design is more commonly used for laboratory testing.Application of flash point testingThe determination of flash point can be used for various applications, such as determining the flash point of diesel and other fuel types in petrochemical analysis, sp
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A comprehensive and detailed explanation of AC series resonant test system
2024-11-29The AC Series Resonant Test System under UHV power can help many power workers conduct various power tests more conveniently.Resonance refers to the simple harmonic vibration in physics, where the acceleration of an object is proportional to the displacement from the equilibrium position and is always directed towards the equilibrium position by the restoring force. The dynamic equation is F=- kx. The phenomenon of resonance is that the current increases and the voltage decreases. The closer it is to the resonance center, the faster the ammeter, voltmeter, and power meter rotate, but the difference from short circuit is that there will be no zero sequence quantity.In physics, there is a concept called resonance: when the frequency of the driving force is equal to the natural frequency of the system, the amplitude of the forced vibration of the system is maximized, and this phenomenon is called resonance. The resonance in a circuit actually means that when the excitation frequency in th
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Judgment of DC resistance tester results
2024-11-28The DC resistance tester under UHV power can help many power workers conduct various power tests more conveniently.1. When measuring the DC resistance of a transformer, due to the large inductance, it is necessary to charge it properly and minimize the self inductance effect. After the pointer of the DC resistance tester stabilizes, read the resistance value to improve accuracy and precision.2. The results of the DC resistance tester should be compared horizontally and vertically, and the influencing factors such as temperature, phase difference, wiring method, tap changer, poor contact, and disconnection should be fully analyzed.a. Temperature influenceDC resistance is directly proportional to temperature. The DC resistance varies at different oil temperatures. The DC resistance measured at different temperatures should be converted to the same temperature for comparison purposes. The formula for converting DC resistance temperature is:R2=R1(T+t2)/(T+t1)(Where R1 and R2 are the resist
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