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Advantages and disadvantages of Karl Fischer titration method
2024-11-22The trace moisture analyzer under UHV power can help many power workers conduct various power tests more conveniently.Karl Fischer titration is a titration method that determines the amount of water (moisture) present in a given sample by using two different techniques, such as volumetric titration or coulometric titration. Many quality control applications require the determination of water content, including chemicals, pharmaceuticals, and food. Karl Fischer titration (KF) is a widely used quality control method that can meet the needs of various industries and research work. The oxidation reaction between iodine and sulfur dioxide is the fundamental principle of Karl Fischer.Karl Fischer reagent contains iodine, sulfur dioxide, alkali, and solvents such as alcohol and anhydrous methanol, which are also used in the KF process.Advantages of Karl Fischer titration:The main advantage of Karl Fischer titration is that it can be used for volatile substances as well as non-volatile substan
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The function of adjustable high-voltage digital megohmmeter
2024-11-22The megohmmeter under UHV power can help many power workers conduct various power tests more conveniently.Adjustable high-voltage digital megohmmeter is a small instrument commonly used in power testing and testing. Although sparrows are just small instruments, they are small and complete. The function of the megohmmeter is also very powerful. Here is an introduction by professional technical engineers from Huayi, as well as the operation part of the adjustable high-voltage digital megohmmeter function.1. L "high voltage output terminal:This is the end of an LSO southern compilation. A megohmmeter uses high-voltage cables to connect the tested circuit, such as the windings of transformers or motors, as well as the core wires of the cables.2. G "protection terminal:When measuring the volume resistance of insulation materials and cables using the three electrode method with a megohmmeter, connect the "G" to the protective ring electrode of the three electrodes. The protective ring is use
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The grounding resistance tester is the key to ensuring circuit safety
2024-11-21The grounding resistance tester under UHV power can help many power workers conduct various power tests more conveniently.DC resistance testing is a very important testing item after transformer handover, overhaul, and replacement of tap changers. It refers to the resistance of buried grounding bodies and the resistance of soil stray currents. Generally speaking, using traditional methods (bridge method and voltage drop method) to measure the DC resistance of transformer windings and high-power inductive devices is both time-consuming and laborious. Usually using a testing instrument for measurement can effectively improve product quality and prevent power accidents from occurring. It consists of a high-power switching power supply circuit, a precision small signal measurement circuit, a protection circuit, and a high-speed microcontroller control circuit. It has functions such as instrument self checking, signal measurement, data processing, rapid discharge, and printing results.The a
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What is an insulation resistance tester
2024-11-21The insulation resistance tester under UHV power can help many power workers conduct various power tests more conveniently.The insulation resistance tester can be used to measure the resistance values of various insulation materials and the insulation resistance of transformers, motors, cables, electrical equipment, etc. Below we will discuss some common issues.What does the output short-circuit current of the insulation resistance tester mean?Long cables, motors with many windings, transformers, etc. belong to capacitive loads. When measuring the resistance of such objects, the output short-circuit current of the insulation resistance tester can reflect the internal resistance of the high-voltage source output inside the megohmmeter.Why use the external "G" terminal to measure higher resistanceThe external "G" terminal (shielded terminal) is used to eliminate the influence of humidity and dirt in the testing environment on the measurement results. When measuring high resistance, if th
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Karl Fischer coulometric titration
2024-11-20The trace moisture analyzer under UHV power can help many power workers conduct various power tests more conveniently.The Karl Fischer titration reaction uses volumetric or Coulombic titration to determine the amount of water present in the sample based on the oxidation of sulfur dioxide by iodine, where water is consumed in the buffer solution.This technology was discovered by Karl Fischer. Karl Fischer titration is a method for determining the moisture content of different types of substances. This depends on the reagent that reacts with the water content and turns it into a non-conductive chemical. Volume KF titration and Coulomb KF titration are two techniques that can be used for Karl Fischer titration of water:Volumetric Karl Fischer titration: Using this technique, the moisture content depends on the volume or quantity of reagents used to convert water. Volume determination is suitable for measuring the moisture content of water as low as 1%. In these types of KF techniques, the
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What is the testing method for insulation resistance tester?
2024-11-19The insulation resistance tester under UHV power can help many power workers conduct various power tests more conveniently.The insulation resistance tester has three types of tests for measuring insulation resistance. Each test uses its own method, focusing on the specific insulation characteristics of the tested equipment. Users need to choose the most suitable one for testing requirements.Point test: This test is suitable for devices with minimal or negligible capacitance impact, such as short circuits.The test voltage is applied over a short distance of time until a stable reading is reached, and the test voltage can be applied for a fixed period of time (usually 60 seconds or less). Collect readings at the end of the test. Regarding historical materials, we will draw maps based on the reading of historical materials. The observation of trends is conducted over a period of time, usually several years or months.This test is usually used for testing or historical records. Changes in t
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Principle of Communication Voltage Resistance
2024-11-19The series resonance under UHV power can help many power workers conduct various power tests more conveniently.The AC withstand voltage test is an indispensable and easiest to detect problem in electrical equipment testing. The power frequency high voltage required for the AC withstand voltage test is generally generated through a high-voltage test transformer or its series device. During the boosting process, if the current increases sharply with the regulation of the voltage regulator, but the voltage remains basically unchanged or shows a downward trend, it is due to excessive experimental load and insufficient capacity of the testing equipment. Due to volume and weight limitations, the capacity of the testing equipment cannot be made very large. In order to achieve the purpose of voltage resistance, it is necessary to use reactance compensation for the experiment.For the tested equipment with a test voltage not exceeding the rated voltage of the experimental transformer and a small
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Common problems with insulation resistance tester
2024-11-18The insulation resistance tester under UHV power can help many power workers conduct various power tests more conveniently.The insulation resistance tester is suitable for measuring the resistance values of various insulation materials and the insulation resistance of transformers, motors, cables, and electrical equipment to ensure that these devices, appliances, and circuits are working in a normal state and to avoid accidents such as electric shock. Personnel casualties and equipment damage.The common problems with insulation resistance testers are as follows:1. What is the relationship between the output short-circuit current of the insulation resistance tester and the measured data when measuring the resistance of capacitive loads, and why?The output short-circuit current of the insulation resistance tester can reflect the internal resistance of the high-voltage power supply.Many insulation test objects are capacitive loads, such as long cables, motors with many windings, transform
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Voltage withstand test and insulation resistance test
2024-11-18The insulation resistance tester under UHV power can help many power workers conduct various power tests more conveniently.1、 Testing principle:a) Voltage withstand test:The basic working principle is to compare the leakage current generated by the tested instrument under the high voltage output of the voltage tester with the preset judgment current. If the detected leakage current is less than the preset value, the instrument passes the test. When the detected leakage current is greater than the judgment current, the test voltage is cut off and an audible and visual alarm is issued to determine the withstand voltage strength of the test piece.For the grounding test principle of the first test circuit, the voltage tester mainly consists of an AC (DC) high voltage power supply, a timing controller, a detection circuit, an indication circuit, and an alarm circuit. The basic working principle is to compare the leakage current generated by the tested instrument at the high voltage output o
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Types of Karl Fischer titration
2024-11-15The trace moisture analyzer under UHV power can help many power workers conduct various power tests more conveniently.Types of Karl Fischer titration:Karl Fischer titration and Coulombic Karl Fischer titration are two techniques used by Karl Fischer titration to determine water content.Volumetric Karl Fischer titration:In volumetric titration, iodine is mechanically introduced into the solvent containing the sample through the burette of the titrator throughout the entire titration process. The volume of KF reagent consumed is used to calculate the amount of water consumed.This method is used to determine the water content within the range of 100 ppm to 100%. Single component volume KF and two-component volume KF are two main types of volumetric KFT reagent systems.Coulombic Karl Fischer titration:In Coulombic titration, the titrant is generated electrochemically in the titration cell and the endpoint is detected electrochemically. The anodic oxidation of iodide in the solution provide
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Analysis and Remedial Measures for Common Malfunctions of Chromatography Instruments
2024-11-15The oil chromatography analyzer under UHV power can help many power workers conduct various power tests more conveniently.1、 The principle and application of chromatographic analyzerThe chromatographic analyzer mainly detects the characteristic information of different components contained in natural gas, in order to obtain accurate natural gas component content. In practical applications, the chromatograph will perform multiple adsorption and desorption operations, analyze the time of appearance of the chromatogram, and record the content of components in the backend system to meet the requirements of natural gas component detection.2、 Analysis and Remedial Measures for Common Malfunctions of Chromatography Analyzer(1) Airway pollution. Chromatography equipment is prone to gas path pollution in daily work. The main reason is that natural gas contains high concentrations of impurity gases. The content of impurity gases can be visually observed through charts. The main reasons for the p
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Analysis of Cable Faults
2024-11-14The cable fault tester under UHV power can help many power workers conduct various power tests more conveniently.In our era, when many enterprises adopt structured network cabling, cable failures may raise concerns. With the development of cables and their functions, more and more components and names increase the likelihood of cable failures.When discussing cable faults, many issues may arise. What are the potential causes or cable faults, and can they be eliminated or even completely avoided? What are the possible consequences of cable failure? Can they be repaired?Network cables are made of stranded copper wires (the most common), which conduct electrical and data based currents and transmit signals from one end to the other. The twisted wire is shielded by a plastic sheath.Faulty cables may not always be easy to diagnose. Bent or folded cables do not always affect signals or cause interference or noise. Cable design is used for signal penetration through complex structural designs,
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The importance of fault detection and prevention of zinc oxide lightning arrester
2024-11-13The zinc oxide lightning arrester tester under UHV power can help many power workers conduct various power tests more conveniently.Zinc oxide lightning arrester is a widely used equipment below 1000kV.It is a common lightning protection device mainly used to prevent damage to electrical equipment in substations caused by lightning waves. It not only has the best nonlinear volt ampere characteristics, but also has low cost, no gap, no freewheeling, high current carrying capacity, and stable performance. However, sometimes accidents such as malfunctions and explosions may occur.The common cause of malfunction is mainly due to poor sealing.Reason analysis: Poor sealing of zinc oxide lightning arrester is mainly caused during the production process of the product. For example, the valve plate of the zinc oxide lightning arrester is not completely dry and contains moisture. Or during the assembly process, the sealing gasket of the lightning arrester may be placed improperly or even not inst
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What is series resonance? A brief analysis
2024-11-13The series resonance under UHV power can help many power workers conduct various power tests more conveniently.Definition of series resonanceIn an AC circuit containing resistor, inductor, and capacitor elements in series, when the power supply voltage U is in phase with the circuit current I, it is called resonance. Since the elements are connected in series, it is called series resonance.Circuit current: l=U/Z Circuit equivalent impedance: Z=R+J (XL-XC)According to the definition of series resonance, when a circuit resonates, the circuit current 1 is in phase with the power supply voltage U. According to the basic knowledge of electrical engineering, only when the AC circuit load is purely resistive, the power supply voltage and current are in phase.As can be seen from the above, circuit resonance has the following obvious characteristics:(1) The equivalent impedance of the circuit reaches its minimum value and is equal to the resistance component, Z=R.(2) The equivalent reactance co
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Principle of the complete set of equipment for frequency conversion series resonance test
2024-11-12The series resonance under UHV power can help many power workers conduct various power tests more conveniently.The principle of the complete set of frequency conversion series resonance test equipmentAccording to the principle of series resonance and the output characteristics of the excitation transformer, the series resonance circuit was excited. By adjusting the output frequency of the frequency converter controller, resonance occurs between the inductance L in the circuit and the test object C. Resonance voltage is the voltage applied to the test object.Test object of the complete set of frequency conversion series resonance test equipmentThe complete set of frequency conversion series resonance test equipment is the most effective method for on-site inspection of the quality of cross-linked cable laying and accessory installation, which can meet the AC withstand voltage requirements of 10kV-500kV high-voltage cross-linked cable series parallel reactors on site.Principle analysis o
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Cable fault location technology and its advantages and disadvantages
2024-11-12The cable fault tester under UHV power can help many power workers conduct various power tests more conveniently.Although there are many fault location techniques and considerable tools to help solve underground cable faults, cable fault location can be very challenging. Most of these issues are due to technicians not interpreting the test results correctly and choosing the wrong tools for the task at hand, ultimately wasting a lot of time because shortcuts were taken in the process. The challenge of locating underground faults can be significantly reduced by understanding the available equipment and technologies. Education and experience in cable fault location will help to correct and improve the interpretation of results, and will certainly aid in selecting which equipment and technology are most suitable for specific tasks. However, only a high level of awareness can correct the waste of time provided through shortcuts.In the following article, we will discuss various cable fault l
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What are the applications of cable fault testers?
2024-11-11The cable fault tester under UHV power can help many power workers conduct various power tests more conveniently.In recent years, with the continuous development of society, computer technology and electronic technology have also become increasingly prosperous. We have briefly introduced the cable fault identification device in previous articles, so we will not elaborate on it here. Today, the editor will continue to follow the relevant knowledge of cable fault testers. Interested friends should not miss it.In recent years, with the development of electronic and computer technology, the functions of cable fault testers have become more diverse, and their reliability and lifespan have also been improved to a certain extent. And today, its development has presented new highlights.1、 The addition of new intelligent modules in cable fault testing: new sensors such as fiber optic sensors, polymer sensors, and biosensors continue to emerge and will experience rapid development.2、 The emergen
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Introduction to the search method of cable identification instrument
2024-11-08The live cable identification device under UHV power can help many power workers conduct various power tests more conveniently.Cable identification devices are generally used to identify cables from a bundle of cables. It consists of a signal generator, a receiver with sensors, and wiring. It is a commonly used equipment for cable installation, migration, maintenance, and troubleshooting. According to usage conditions, cable identifiers can be divided into live cable identifiers and non live cable identifiers. Let's talk about their respective search and usage methods.Search method for live cable identification instrumentWhen the line is live, we cannot affect normal operation. When identifying cables with points, induction method is used for measurement. High frequency signals are transmitted through calipers, and the receiver receives the signal characteristics and filters them through software and hardware before performing phase recognition. When the receiving calipers clamp th
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Advantages and precautions of series resonant devices
2024-11-08The series resonance under UHV power can help many power workers conduct various power tests more conveniently.Precautions to be taken when using a variable frequency series resonant device:1. The variable frequency series resonant device is a high-voltage experimental equipment that requires the use of high-voltage experimental professionals. Before use, carefully read the instructions and repeat the operation practice.2. There should be no less than 2 operators. The safety operating procedures for high-voltage testing should be strictly followed during operation.3. In order to ensure the safety and accuracy of the experiment, it is not only necessary to understand the specifications of the product, but also to strictly follow the relevant national standards and regulations for the experiment.4. Each connecting wire must not be misconnected, especially the ground wire. Otherwise, it may cause damage to the equipment.5. When using this device, the output voltage is high voltage or ultr
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What are the parameters and how to use the circuit resistance tester?
2024-11-07The circuit resistance tester under UHV power can help many power workers conduct various power tests more conveniently.High voltage circuit breakers increase circuit resistance due to oxidation of contact surfaces and poor contact fastening. When a large current flows, the temperature at the contact point increases, accelerating the oxidation of the contact surface and further increasing the contact resistance. The accident is serious and requires frequent or regular measurement of contact resistance. The "circuit resistance tester" is suitable for testing the contact resistance of the main contacts of high and low voltage switches. The resistance test of various switchgear conductive circuits should not be less than 100A. There are currently three main types of "circuit resistance testers" on the market:① The output current of the "circuit resistance tester" is 100A, with a range of 1999 μ Ω and a resolution of 1 μ Ω. This "circuit resistance tester" is widely used in the market and
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