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Frequently Asked Questions about Frequency Conversion AC Series Resonant Test
2024-11-27The Frequency Conversion AC Series Resonant under UHV power can help many power workers conduct various power tests more conveniently.Q: What are the AC withstand voltage testing methods using the series parallel resonance principle?Answer: For AC withstand voltage testing of large capacity test objects such as long cable lines, capacitors, large generators, transformers, etc., large capacity testing equipment and power sources are required, which are often difficult to achieve on site. In this case, series parallel resonance or series parallel resonance (also known as series parallel compensation) can be used according to the specific situation to solve the problem of insufficient capacity of the testing equipment.(1) Series resonance (voltage resonance) method. When the rated voltage of the test transformer cannot meet the required test voltage, but the current can meet the test current of the tested object, the problem of insufficient test voltage can be solved by series resonance.(
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Detailed explanation of testing steps for cable fault location detector
2024-11-27The cable fault location detector under UHV power can help many power workers conduct various power tests more conveniently.The basic steps of fault testing are to measure the insulation resistance of the faulty cable with a megohmmeter or multimeter, determine the nature of the fault, and determine the testing method; Test the fault distance; Detecting the path of cable burial near the fault point; Fixed point. This testing system has three basic methods for fault testing: low voltage pulse, direct flash, and impulse flash. Combined with different sampling methods, there are a total of eight testing methods. Disconnect all connections at the cable terminals before testing. There are two knobs on the panel of the testing system, "Input Amplitude" and "Displacement", which are used to adjust the signal amplitude and up and down position for the next sampling, respectively.1. Low voltage pulse method is used to test the speed of radio wave propagation in cables, the total length of cable
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Introduction to series resonant reactor
2024-11-26The AC Resonant Test Set under UHV power can help many power workers conduct various power tests more conveniently.At the resonant frequency, the reactor and load convert the excitation square wave voltage into an ideal sine wave. The parameter selection of high-voltage reactors must fully consider the power and frequency range of the test sample. The existing reactive power compensation equipment in the power system includes two types: static reactive power compensation devices and dynamic reactive power compensation devices. The former includes parallel capacitors and parallel reactors, while the latter includes synchronous compensators (phase-shifters) and static reactive power dynamic compensation devices (SVS).The combination of single-stage reactors can meet the optimal configuration of the circuit, ensuring the output voltage and frequency range. The voltage level of each stage reactor can be determined separately. The advantages of this type of reactor are easy combination and
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Operation steps of open flash point tester
2024-11-25The open flash point tester under UHV power can help many power workers conduct various power tests more conveniently.The open flash point tester adopts microcomputer technology and a large screen LCD display. The instrument heats up, automatically raises and lowers, automatically ventilates, automatically ignites, automatically displays, automatically locks the flash point value, and automatically prints the results according to standard methods. After testing, it can automatically cool down, achieving full automation of the working process. The automatic open flash point tester has the advantages of accurate measurement, good repeatability, stable performance, and simple operation. It has a wide range of applications in petroleum, chemical, light industry, and power industries.The flash point value and ignition point value are used to indicate the presence of highly volatile or flammable substances in relatively non-volatile or flammable substances, and are important parameters for t
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Classification of test transformers
2024-11-25The professional production of high-voltage test transformers in UHV power can help many power workers conduct various power tests more conveniently.A test transformer is a transformer used for conducting power frequency withstand voltage tests on various electrical products and insulation materials, also known as a high-voltage test transformer. The main features of this system are as follows:A. High voltage. The rated voltage of a single machine is 50, 100, 150, 250, 500, and 750 kV.B. High voltage waveform requirements. Usually, power is supplied by a generator set, filters are used, and the magnetic density of the transformer itself should not be high.C. Short working hours. Due to the short withstand time of the tested product (1 minute or 5 minutes), the working time is generally within half an hour.D. The current is small. The rated current of the experimental transformer is actually the capacitance current of the measured object, so it is usually less than 1a.There are four typ
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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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