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What should be noted when using a series resonant device?
2024-10-10The series resonance under UHV power can help many power workers conduct various power tests more conveniently.The variable frequency series resonant device utilizes the principle of series resonance and the output characteristics of the excitation transformer to excite the series resonant circuit. By adjusting the output frequency of the variable frequency controller, the inductance L in the circuit resonates with the sample C. The resonant voltage is the voltage applied to the sample. On site inspection of the laying quality of cross-linked cables and the installation quality of accessories is an effective means. By connecting series and parallel reactors, the AC withstand voltage requirements of 10kV-500kV high-voltage cross-linked cables can be met.The variable frequency series resonant device is suitable for AC withstand voltage testing of various large power transformers, power cables, steam turbines, hydroelectric generators and other capacitive devices, and must be strictly car
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A Review of Trace Moisture Titration
2024-10-10The trace moisture analyzer under UHV power can help many power workers conduct various power tests more conveniently.In the presence of water, the water in the sample undergoes redox reactions with SO2 and I2 in the Karl Fischer reagent.I2 + SO2 + 2H2O → 2HI + H2SO4But this reaction is reversible, and when the concentration of sulfuric acid reaches 0.05% or more, a reverse reaction can occur. If we want the reaction to proceed in a positive direction, we need to add an appropriate alkaline substance to neutralize the acid generated during the reaction process. It has been experimentally proven that adding pyridine to the system can cause the reaction to proceed to the right.3 C5H5N+H2O+I2+SO2 →+Pyridine sulfatePyridine sulfate is unstable and can react with water, consuming a portion of the water and interfering with the measurement. To stabilize it, we can add anhydrous methanol.Pyridine sulfate+CH3OH (anhydrous) → Pyridine methylsulfateWe write the above three steps of the reaction
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The process of battery charging and discharging and the principle of battery charging and discharging tester
2024-10-09The battery charging and discharging tester under the UHV power company can help many power workers conduct various power tests more conveniently.1. When the battery is charged, under the action of an external power source, lead metal sulfate is reduced to pure lead and lead in the electrolyte, and a large number of electrodes return from the negative electrode to the positive electrode plate. This forms a charging current. As the battery is charged, the sulfuric acid in the electrolyte continues to increase, and the density of the electrolyte gradually increases. The more it is charged, the higher the density of the electrolyte.However, after all the sulfation is completed, the density of the electrolyte also reaches its highest. If charging continues, this electricity will electrolyze water, generating hydrogen and oxygen, which is the charging process. "Foam". This process involves converting external electrical energy into chemical energy and storing it in the battery.2. When the b
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The Generation and Application of Series Resonance
2024-10-09The series resonance under UHV power can help many power workers conduct various power tests more conveniently.The generation of resonanceIn AC circuits with resistors, inductors, and capacitors, the voltage, current, and phase at both ends of the circuit are slightly different. If the parameters of inductance and capacitance or the power frequency are adjusted, the phase can be made the same, the circuit becomes purely resistive, and the circuit reaches this state as resonance.Resonance is the simple harmonic vibration in physics, where the acceleration of an object is proportional to the displacement away 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 a short circuit is that there wil
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Main functions of microcomputer relay protection tester
2024-10-08The relay protection tester under UHV power can help many power workers conduct various power tests more conveniently.The main functions are as follows:Action device transmission device1. Circuit tester microcomputer environmental protectionWhen accidents such as wind, snow, lightning strikes, external damage, insulation damage, and external insulation flashover pollution occur during the operation of transmission lines, the relay protection tester can quickly and selectively switch the faulty circuit breaker (switch).If the fault is non permanent, when the instantaneous fault disappears, the switch is successful and the power supply line is restored to safety. If the fault is permanent and the overlap switch fails, quickly troubleshoot the faulty circuit and ensure that the power supply to the circuit is normal.2. Overcurrent protection deviceThe protective device adopts the characteristic that the fault current line of the power grid can significantly affect the increase of current,
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Definition and harmfulness of series resonance
2024-09-30The series resonance under UHV power can help many power workers conduct various power tests more conveniently.1、 DefinitionIn a series circuit composed of resistors, inductors, and capacitors, when the capacitive reactance XC is equal to the inductive reactance XL, i.e. XC=XL, the phase of the voltage U and current I in the circuit are the same, and the circuit exhibits pure resistive behavior. This phenomenon is called series resonance. When a series resonance occurs in a circuit, the impedance of the circuit and the total impedance in the circuit are minimized, and the current will reach its maximum value.2、 HarmfulnessWhen resonance occurs, due to the equal inductance and capacitance, the effective values of the voltage across the inductance and capacitance are equal, that is, UL=UC. Due to their opposite phases, these two voltages cancel each other out. The effective voltage value of a capacitor or inductor is: UL=UC=XLI0=ω 0LIO=ω 0LU/R. In the formula, ω 0L/R is referred to as th
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How to install and operate the petroleum flash point and ignition point tester?
2024-09-30The open flash point tester under UHV power can help many power workers conduct various power tests more conveniently.Installation and operation of petroleum flash point and ignition point tester?1. Before using the petroleum flash point and ignition point tester, carefully read the instruction manual.2. According to the test object, carefully read GB/T3536 "Determination of Flash Point and Ignition Point of Petroleum Products" to understand and familiarize yourself with the test methods, steps, and requirements outlined in the standard.3. According to the requirements specified in the standard, the petroleum flash point and ignition point tester should be placed in a dark and sheltered place to observe the flash fire, and various testing instruments, materials, etc. should be prepared for the test.4. Check the working status of the petroleum flash point and ignition point tester to ensure that it meets the working environment and conditions specified in the instructions.5. Check the c
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What are the applications of series resonance and parallel resonance circuits?
2024-09-29The series resonance under UHV power can help many power workers conduct various power tests more conveniently.1、 The applications of series circuit resonance include:1. Series resonance can be used to select the desired signal from numerous frequency signals. By utilizing the characteristic that the voltage of the inductor (or capacitor) during resonance is higher than the applied signal voltage, a voltage Q times higher than the original signal can be obtained and amplified. This not only screens useful signals but also suppresses interference from other frequency signals.2. Series resonance can also absorb interference signals at the resonance frequency. By utilizing the principle of minimizing impedance during resonance, LC series branches are connected in parallel in the circuit, allowing the signal at the resonance frequency to be bypassed to the maximum extent, while other frequency signals can be unobstructed, forming a band stop filter.3. By connecting the LC series branches i
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Introduction to Soil Electrical Resistance Testing
2024-09-27The grounding resistance tester under UHV power can help many power workers conduct various power tests more conveniently.Soil resistivity is an indicator that measures the degree of resistance of soil to electrical current. The soil resistivity test is currently determining this measure. Therefore, it is a key factor in designing systems that rely on the current passing through the Earth's surface. Understanding soil resistivity and how it varies with soil depth is essential for designing electrical grounding systems. In substations, or used for lightning rods. This measurement is also required for the grounding electrode design of substations and high-voltage direct current transmission systems. Because most substations use the earth to conduct all or most of the fault current when a grounding fault occurs in the system.What is soil resistivity testingSingle line return lineIn a single line power transmission system. The Earth itself serves as a pathway for conduction from end cu
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What factors affect the measurement results of kinematic viscosity?
2024-09-26The kinematic viscosity tester under the UHV power company can help many power workers conduct various power tests more conveniently.The influencing factors of the measurement results of the fully automatic kinematic viscosity testerThe fully automatic kinematic viscosity tester is based on a microcontroller. After setting a constant temperature point, the instrument automatically heats up, maintains a constant temperature, and turns on the stirring motor. When the temperature is constant, the experiment can be conducted according to the methods specified in GB/T standards.Kinematic viscosity is an important indicator of lubricating oil. Kinematic viscosity is a conditional viscosity that measures the time it takes for a certain volume of liquid to flow through a calibrated glass capillary viscometer under gravity at a constant temperature. A friction surface with too low viscosity cannot form a firm oil film, which cannot guarantee reliable lubrication of engine components and will in
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How to choose a cable fault tester? The cable fault tester manufacturer informs you
2024-09-25The cable fault tester under UHV power can help many power workers conduct various power tests more conveniently.The cable fault tester is a commonly used cable fault detection equipment, with guaranteed accuracy and detection speed. We are accustomed to evaluating an item before making a purchase, assessing its performance, value, price, and other aspects before deciding whether to make a purchase. So, what aspects should be evaluated when purchasing a cable fault tester?When choosing a cable fault tester, it is necessary to understand its performance, whether its overall performance is stable, or whether it is convenient to operate throughout the entire process? If there are problems with the operation and unstable performance of the cable fault tester you have chosen, it will definitely lead to more problems throughout the entire use, not to mention that the cable fault tester you have chosen is suitable for your own use and cannot highlight its entire value.Therefore, when choosing
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How to customize a cable fault tester?
2024-09-23The cable fault tester under UHV power can help many power workers conduct various power tests more conveniently.Customization is now a very popular concept, and many companies' products can be customized. Customized things in many people's minds will better meet their requirements and be more comfortable to use. Can cable fault detectors also be customized? What requirements do we need to explain to the manufacturer when customizing? Let's discuss these issues today.With the growth of the Chinese economy, various industries in China have undergone varying degrees of changes. Take the power testing equipment industry we are in as an example. Enterprises that manufacture cable fault testers, transformer testers, and relay protection testers are constantly expanding and increasing. However, with the rise of Made in China, customization has become a norm in the industry. What should be paid attention to when customizing cable fault testers?Firstly, we need to have a good under
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Introduction to issues related to circuit resistance
2024-09-19The circuit resistance tester under UHV power can help many power workers conduct various power tests more conveniently.What does circuit resistance mean?The DC circuit resistance is the total resistance of two conductors that form a circuit at one end of the link. This is usually a function of the conductor diameter, which varies only with distance. DC resistance is often confused with impedance, which is a term used to describe the dynamic resistance of a signal flow, typically at a specified frequency.What is cyclic testing?Loop testing is defined as a type of software testing that focuses entirely on the effectiveness of loop structures. It is one of the components of control structure testing (path testing, data validation testing, condition testing). Loop testing is a type of white box testing. This technique is used to test loops in programs.What is a circuit tester?We specialize in producing circuit resistance testers for ultra-high voltage power. You can contact ultra-high vol
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How to solve the fault of DC high-voltage generator?
2024-09-14The DC high-voltage generator under the UHV power company can help many power workers conduct various power tests more conveniently.DC high-voltage generators have the characteristics of small size, light weight, beautiful and reliable appearance, simple operation, and complete functions, and are widely used in the power sector of enterprises such as electric power, mining, metallurgy, and steel. Mainly conduct DC withstand voltage tests on high-voltage electrical equipment such as zinc oxide lightning arresters, power cables, transformers, generators, and high-voltage switches.As a large electrical equipment, DC high-voltage generators may encounter some common faults during use. First, let's talk about the common faults and solutions of DC high-voltage generators.1. Turn on the battery switch of the DC high-voltage generator, but the battery indicator light and green light are not on?Fault analysis: Check the battery fuse, battery cable, and battery switch;Solution: If there is a
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How to safely connect series resonant circuits?
2024-09-13The series resonance under UHV power can help many power workers conduct various power tests more conveniently.The frequency conversion resonance withstand voltage test device adopts a dedicated broadband voltage regulation power supply, with a voltage regulation range of ac0-400V, a frequency modulation range of 30-300Hz, and a frequency fineness of up to 0.1Hz; The output waveform within the entire frequency range is good, ensuring the stability and safety of the instrument at the minimum weight and volume. The device consists of a frequency and voltage regulating power supply, an excitation transformer, a reactor, and a capacitor voltage divider. The frequency conversion resonance withstand voltage test belongs to the high-voltage withstand voltage test. There are many things to pay attention to during the testing process. The circuit connection and precautions of the frequency conversion resonance withstand voltage test device are as follows:Through on-site testing of the full load
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Precautions for choosing a cable fault tester
2024-09-13The cable fault tester under UHV power can help many power workers conduct various power tests more conveniently.Cable fault tester is one of the commonly used devices for detecting cable faults. Its performance is stable, and it can quickly and accurately identify the fault point. Maintenance personnel can quickly carry out maintenance work, greatly improving work efficiency. The selection of cable fault testers is also a concern for many friends. Next, we will focus on introducing the precautions for purchasing.Another situation of power supply analysis: In recent years, 80% of cable fault testers have been damaged due to poor wiring or wiring errors caused by high-voltage flashing, resulting in high-voltage signals entering the host and causing instrument damage. If battery power is used, even if high-voltage signals enter, they do not form a circuit to the ground and can only cause common mode effects, thus completely avoiding machine damage accidents.Reasons why laptops and collec
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How to purchase secondary testing equipment?
2024-09-12We specialize in producing secondary testing equipment for UHV power. Next, we will share with you how to purchase secondary testing equipment?Testing qualification equipment is indeed a device that power companies are familiar with and familiar with nowadays. Such equipment can help power companies apply for testing qualifications, and there are different levels of testing qualification equipment. Testing qualification equipment is also essential, but it also includes other instruments that power companies need to understand.As long as one is familiar with the qualification equipment for testing, it can be found that such equipment still includes other instruments and equipment that can be understood by power companies now. Therefore, it is necessary to understand the list of instruments and equipment included in it. At present, power companies can easily search for and access relevant qualification equipment websites to search for such equipment, including being able to understand wh
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How to purchase primary testing equipment?
2024-09-12We specialize in producing primary testing equipment for UHV power. Next, we will share with you how to purchase primary testing equipment?Testing qualification equipment is indeed a device that power companies are familiar with and familiar with nowadays. Such equipment can help power companies apply for testing qualifications, and there are different levels of testing qualification equipment. Testing qualification equipment is also essential, but it also includes other instruments that power companies need to understand.As long as one is familiar with the qualification equipment for testing, it can be found that such equipment still includes other instruments and equipment that can be understood by power companies now. Therefore, it is necessary to understand the list of instruments and equipment included in it. At present, power companies can easily search for and access relevant qualification equipment websites to search for such equipment, including being able to understand which
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Types and diagnostic methods of internal faults in power transformers
2024-09-11Internal faults in power transformers can be classified into two types:Overheating and discharge faults. According to temperature, overheating faults can be divided into low-temperature overheating, medium temperature overheating, and high-temperature overheating. Discharge faults can be classified into high-energy discharge, low-energy discharge, and partial discharge based on their energy density. Three types.As for mechanical failures and internal water ingress and moisture, they will eventually develop into electrical failures.Overheating faults are caused by accelerated insulation degradation due to thermal stress.If thermal stress only causes the decomposition of insulating oil outside the heat source, the special gases produced are mainly methane and ethylene, which generally account for more than 80% of the total hydrocarbons. As the fault point increases, the proportion of ethylene will increase, and severe overheating will produce trace amounts of acetylene.When overheating i
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What is weak current engineering?
2024-09-11Power applications can be divided into strong power and weak power based on the strength of power transmission. The electricity consumption of a building complex generally refers to AC 220V 50Hz and above strong electricity. Mainly providing electricity for people, converting electricity into other energy sources such as air conditioning electricity, lighting electricity, power electricity, etc.There are mainly two types of weak electricity in smart buildings. One is low-voltage electricity such as national security voltage levels and control voltages, AC/DC, AC below 36V, and DC below 24V, such as 24V DC control power supply or emergency lighting backup power supply. Another type is information sources that contain voice, image, data, and other information, such as telephone, television, computer information, etc.People are accustomed to calling it weak current technology. It can be seen that the basic meaning of weak current technology in intelligent buildings is still the original w
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