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Precautions for using halogen moisture analyzer
2024-10-17The trace moisture analyzer under UHV power can help many power workers conduct various power tests more conveniently.1. Pay attention to the moisture regain and water absorption of the sample. If the sample has a certain moisture regain and water absorption rate, attention should be paid to the sealing and sampling time of the sample during the testing process. The sample should be sealed and stored to accelerate the sampling time;2. Set the appropriate temperature, not too high, to prevent items from evaporating, and ensure safety;3. Wear gloves and masks during the experiment to ensure personal safety;4. Sampling can be done by laying a layer of sample tray, do not stack it too high, and ensure complete drying;5. Determine if there are any vibrating substances around the instrument. Halogen moisture analyzer is a precision instrument. If there are too many vibrating substances around, it will affect the measurement results.6. After one experimental measurement is completed, wait for
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Working principle of trace moisture analyzer
2024-10-16The trace moisture analyzer under UHV power can help many power workers conduct various power tests more conveniently.Trace moisture analyzer is an electrochemical method. The Kjeldahl method is divided into two major methods: the Kjeldahl capacity method and the Kjeldahl Coulomb method. Both methods are established as standard analytical methods by many countries to calibrate other analytical methods and measuring instruments.Method IntroductionIn 1935, Karl Fischer first proposed the method of using volumetric analysis to determine moisture content, which is the visual method in GB6283 "Determination of Moisture Content in Chemical Products". The visual method can only determine the moisture content of colorless liquid substances. Later, it developed into the electricity method. With the development of technology, the Coulomb method was developed by combining the Coulomb meter with the volumetric method. This method is the testing method in GB7600 "Determination of Moisture Content i
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Characteristics of Power Frequency Series Resonance Testing System
2024-10-16The series resonance under UHV power can help many power workers conduct various power tests more conveniently.With the development of the power system, the capacity of operating equipment continues to increase. For example, the single unit capacity of thermal power units has exceeded 1000MW, and the maximum capacity of hydroelectric units has reached 800MW. If using transmissionThe unified testing equipment (power frequency test transformer) is used for AC power frequency withstand voltage testing of these devices. The voltage regulator has a large volume and requires a large testing capacity. It is difficult to solve the problem of large capacity testing power supply on site, so on-site testing is extremely inconvenient. The host of the power frequency withstand voltage tester has advantages in terms of testing power capacity, equipment waveform, and investment. The main unit of the power frequency withstand voltage tester focuses on the potential design and manufacturing of AC withs
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Correct usage method of discharge rod for DC high-voltage generator
2024-10-15The DC high-voltage generator under the UHV power company can help many power workers conduct various power tests more conveniently.The DC high-voltage generator adopts an intelligent voltage doubling circuit, greatly reducing the volume and weight of the control box and pressure doubling cylinder, making it more convenient for on-site use. By using aiPWM technology, the inaccurate linearity of PWM technology has been adjusted, greatly improving the accuracy of the instrument. Using AI technology to set overvoltage protection and overcurrent protection, instead of digital dip switches, can only set voltage values and cannot set current values and voltage drift issues. According to electromagnetic compatibility theory, special shielding, isolation, and grounding measures are adopted to ensure that the DC high-voltage generator achieves high quality and can withstand rated voltage discharge without damaging the machine.When the power switch of the DC high-voltage generator is turned on,
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Introduction to the Structure and Principle of Cable Fault Tester
2024-10-15The cable fault tester under UHV power can help many power workers conduct various power tests more conveniently.Cable fault tester is a commonly used cable fault detection equipment, which is used for various cable fault detection. Its stable performance and accurate detection make cable fault detection work more comprehensive. The work efficiency of the testing personnel has greatly improved. Today we will mainly explore the composition of a live cable fault tester.The testing composition of cable fault tester:1、 The live cable fault tester consists of the following components:1. Instrument host: Cable fault flashover tester, abbreviated as flashover tester. Cable path testing signal source, abbreviated as path tester. Cable fault fixed-point/path meter receiver, abbreviated as fixed-point instrument.2. High voltage accessory: High voltage pulse capacitor. A dual-purpose AC/DC high-voltage testing transformer. High voltage test transformer operation box.2、 The testing functions of th
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Application of DC High Voltage in Power Cable Testing
2024-10-12The DC high-voltage generator under the UHV power company can help many power workers conduct various power tests more conveniently.1. Measure insulation resistanceThe metal shielding or metal sheath and armor layer of the cable should be carried out on each phase and connected to the metal shielding and armor layer of the cable. For this test, as long as the cable is a capacitive device, the capacitive device is insulated. Attention should be paid to the resistance and absorption. For example, complete discharge before and after testing. After a round of fire, disconnect first.2. DC withstand voltage and leakage current testInsulated cables are only designed for DC withstand voltage and not for AC withstand voltage, as AC IG can cause thermal radiation; Uneven distribution of heat and electric field can easily damage cables. It should be noted that the cable core wire has a negative polarity, and after the cable is sorted, the moisture carries a positive charge. If the iron core is th
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Operation steps and characteristics of series resonance
2024-10-12The series resonance under UHV power can help many power workers conduct various power tests more conveniently.When using it, be sure to check its wiring because if you haven't used series resonance for a long time, it is likely to become loose, and its parts may also have some looseness that hasn't been checked. Directly detecting the resistance voltage of the equipment under the premise can easily cause problems in the entire detection process, resulting in inaccurate data and inability to solve the problems faced by the equipment So when using series resonance, everyone should consider this issue and naturally ensure a high detection effect throughout the entire use process, without considering certain things. Make yourself suffer losses.Of course, regular maintenance is required when choosing series resonance, and it should not be operated during the detection process, because series resonance can automatically or manually input data. If you choose a certain type of input,
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How to use a DC system grounding fault tester
2024-10-11The grounding resistance tester under UHV power can help many power workers conduct various power tests more conveniently.1. Connect the signal generator to the DC system:Signal connection method of the signal generator: connect the red clip to the positive busbar; Connect the black clip to the negative busbar; Connect the yellow clip to the ground wire. After ensuring that the signal generator is connected correctly, turn on the power switch of the signal generator.2. Output signal adapts to various voltage levels:The signal generator adapts to DC systems of various voltage levels. When there is no grounding fault in the system, the "normal" indicator light is on. The grounding DC system voltage, positive grounding voltage, and negative grounding voltage of the LCD display. When a grounding fault occurs in the system, the signal generator automatically determines the grounding polarity. If the system is grounded to the positive pole, the "positive ground" indicator light of the signal
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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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