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How to select a complete set of equipment for power frequency withstand voltage test
2025-09-03Wuhan UHV specializes in the production of series resonance (also known as power frequency withstand voltage test equipment). Next, we will share with you how to select the power frequency withstand voltage test equipment.Overview of Series Resonance Test DeviceThe series resonance test device is a series resonance test device that uses tuned inductors and load capacitors to generate power frequency series resonance and obtain power frequency test voltage. A resonant series is composed of isolation and transformer, frequency and voltage regulation system power supply, excitation for transformer, reactor, and capacitive voltage divider. The capacitors and resistors of the subjects form a series resonant connection, and the voltage molecules are connected in series with the main body to measure the resonant voltage on the main body and provide overvoltage protection signals. The frequency modulation power output is coupled with the excitation transformer and the series resonant circuit t
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Guidelines for Safe Operation of AC Withstand Voltage Test Equipment
2025-09-03Wuhan UHV specializes in producing series resonance (also known as AC withstand voltage test equipment). Next, we will share with you the safety operation guidelines for AC withstand voltage test equipment.1. It is not allowed to suddenly cut off the system power during testing. Before performing the series resonance test, the test state must be exited before the power can be cut off. 2. After the host malfunctions, do not open the chassis for maintenance, otherwise the consequences will be borne by yourself. 3. Do not store or use the instrument in high temperature, high humidity, flammable, explosive, or strong magnetic fields. 4. Use a damp cloth and neutral cleaning agent to clean the instrument casing for maintenance and upkeep. Do not use abrasives and solvents. 5. Before testing, please check whether the series resonant instrument is intact, whether the connecting wires are intact, ensure power output, whether the signal sampling cable is firmly connected, and whether the co
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The reason why the series resonance test equipment cannot be improved
2025-09-03Wuhan UHV specializes in producing series resonance (also known as series resonance test equipment). Next, we will share with you the reasons why series resonance test equipment cannot be improved.There are two main reasons why series resonance testing equipment does not boost voltage when understanding voltage. For example, whether the boost point did not rise after finding the resonance point, or whether the boost did not rise during the search for the resonance point. By analyzing these two situations, determine whether there is a problem with the series resonance testing device itself or whether the insulation of the test item is damaged.For example, the first scenario is damage to the cable insulation layer (this possibility is very small, and if it is damaged, the resonance point cannot be found).The second scenario is that the reactor you are using is damaged. This kind of hardware damage will definitely not increaseUsually, series resonance does not enhance. In most cases, prob
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Characteristics of Variable Frequency Series Resonant Device
2025-09-02Wuhan UHV specializes in producing series resonant devices (also known as variable frequency series resonant devices). Next, we will share with you the characteristics of variable frequency series resonant devices.The main characteristics of series resonance are:1. Easy to operate: Two modes of automatic testing (automatic search for resonance point and automatic boost) and manual testing (manual search for resonance point and manual boost) are suitable for different testing requirements. 2. Can set the test voltage, frequency range, protection current, and pressurization time.3. Automatic mode: only need to set the test voltage and time; Automatic precision of equipment Quasi frequency regulation and voltage regulation; Complete the experiment and save the data. 4. It has grounding and flashover protection functions. In the event of flashover of the test sample or sudden loss of resonance in the resonant circuit caused by other reasons, the variable frequency control power supply wi
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Do you understand all these principles of series resonance
2025-09-02Wuhan UHV specializes in producing series resonance (also known as series resonance test device). Next, we will share with you the principles of series resonance. Are you clear about them.Resonance is a physical harmonic vibration in which the acceleration of an object is proportional to the displacement from the equilibrium position, and always points towards the restoring force at the equilibrium position. Its dynamic equation is f=- KX. The resonance phenomenon occurs when the current increases, the voltage decreases, and the closer it is to the resonance center, the faster the power meter rotates. However, the difference between short circuit and short circuit is not a zero order quantity. resonant circuitA circuit composed of inductance L and capacitance C can resonate at one or more frequencies, known as a resonant circuit. In electronic and wireless engineering, it is often necessary to select the electrical signals we need from many electrical signals, while suppressing or fil
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Introduction to the New Series Resonant Withstand Voltage Device
2025-09-02A newly disclosed series resonant voltage withstand device (also known as series resonant). The capacitors and reactors of the test object are connected in series resonant connection, the high-voltage discharge device is connected in parallel with the test object, and the output of the variable frequency power supply is coupled to the series resonant circuit through a driving transformer. The lower output voltage of the variable frequency power supply can generate a higher test voltage on the test object through circuit resonance.technical fieldThis utility model relates to an electric power testing device, particularly to a testing unit that uses the principle of circuit resonance to obtain the required high voltage test. Background technologyAt present, due to the large capacitance of general test specimens or high expectations for test voltage, there are higher requirements for the power supply capacity of test specimens. For traditional industrial grade withstand voltage devices,
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Characteristics of using power frequency withstand voltage test equipment
2025-09-01Wuhan UHV specializes in producing series resonance (also known as power frequency withstand voltage test equipment). Next, we will share with you the characteristics of using power frequency withstand voltage test equipment.Variable frequency series resonance consists of a variable frequency control power supply, excitation system transformer, reactor, and capacitive voltage divider. The test object forms a series resonant connection with the capacitor of the reactor; The voltage divider is connected in parallel with the test object to measure the resonant voltage on the test object and issue an overvoltage protection signal; The frequency modulation power output is coupled to the series resonant circuit through an excitation transformer to provide excitation power for series resonance. The test and detection device for frequency conversion series resonance structure is based on the working principle of knowledge series resonance. The excitation transformer can be used to excite the s
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When LC parallel circuit resonates, it is equivalent to an open circuit, and when connected in series, resonance is equivalent to a short circuit
2025-09-01Wuhan UHV specializes in producing series resonance (also known as series resonance withstand voltage equipment). Next, we will share with you that LC parallel circuit resonance is equivalent to an open circuit, and series resonance is equivalent to a short circuit.When in parallel resonance, there are currents on both L and C components, which are equal in magnitude and opposite in phase. Combining L and C together as a whole, this whole has a current of '0' and no current exchange with the external circuit, so it is considered an open circuit. At this point, the resonant circuit can be seen as a two terminal component with infinite impedance. On the contrary, when connected in series, the resonant impedance is 0, which is equivalent to a short circuit.The essence of resonance is the mutual conversion between the electric field energy in the capacitor and the magnetic field energy in the inductor, which completely compensates for each other. The sum of electric field energy an
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A Brief Analysis of the Principle of Series Resonance
2025-09-01Wuhan UHV specializes in producing series resonance devices (also known as variable frequency series resonance devices). Next, we will share with you an analysis of the principle of series resonance.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 min
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Do you know about series resonance and parallel resonance
2025-08-29Wuhan UHV specializes in producing series resonance (also known as cable withstand voltage test equipment). Now, we will share with you the series resonance and parallel resonance. Do you know about themCharacteristics of parallel resonance and series resonanceParallel resonance refers to the phenomenon in which the resistance, capacitance, and inductance in a parallel resonance circuit have the same phase as the circuit terminal voltage and total current. We call it a parallel resonance circuit. In the parallel resonance test, when the voltage remains constant and the current is added, the corresponding parallel resonance is series resonance. The characteristic of series resonance is to form a series connection between the capacitance of the test object and the reactor to generate resonance. The electrical characteristic of voltage addition and current remains constant is called series resonance, which can also be called a series circuit.Composition of parallel resonance and series re
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What are the hazards of non sinusoidal waves on AC withstand voltage testing?
2025-08-29Wuhan UHV specializes in producing series resonance (also known as series resonance test withstand voltage device). Next, we will share with you the hazards of non sinusoidal waves on AC withstand voltage testing?1. When conducting AC withstand voltage tests, some voltage measuring instruments measure the effective value of the voltage. Power frequency discharge or breakdown generally determines the amplitude of the voltage. When the test voltage waveform is non sinusoidal, the ratio of the amplitude of the voltage to the effective value (i.e. the crest factor) is not √ 2. When the waveform is severely distorted, a large third harmonic component is mainly superimposed on the sinusoidal fundamental component, resulting in a crest factor of 1.45-1.55. At this time, if the amplitude is calculated by multiplying the effective value by √ 2, it will cause significant test errors.2. The waveform of the power frequency test voltage also has a certain impact on the insulation test results of ce
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Precautions for AC withstand voltage test
2025-08-29Wuhan UHV specializes in producing series resonance (also known as AC voltage withstand test device). Next, we will share with you the precautions for AC voltage withstand test.Precautions for communication withstand voltage test:1. Before conducting the AC withstand voltage test, the outer insulation surface of the test object should be wiped clean. For oil filled equipment, the oil should be allowed to stand still for a period of time according to regulations to eliminate any residual air inside.2. The AC withstand voltage test is a destructive test that must be conducted only after all insulation test items have passed the test. 3. During the boosting process, the voltage rises slowly while the current rises sharply. This may be due to the presence of a short circuit or similar situation in the tested equipment, or it may be due to the tested equipment having a large capacity or approaching resonance. 4. During the boosting process, the current decreases while the voltage remains
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Do you know the conditions for resonance in series and parallel circuits
2025-08-28Wuhan UHV specializes in producing series resonance (also known as power frequency withstand voltage test equipment). Next, we will share with you the conditions for resonance in series and parallel circuits. Do you know.1. In a series resonant circuit of resistors, capacitors, and inductors, the phenomenon of power supply, voltage, and current being in phase occurs, which is called series resonance. Its characteristics are: the circuit is purely resistive, the power supply, voltage, and current are in phase, the reactance X is equal to 0, and the impedance Z is equal to the resistance R. At this time, the impedance of the circuit is the smallest and the current is the largest. High voltages that are many times larger than the power supply voltage may be generated on the inductor and capacitor, so series resonance is also known as voltage resonance. 2. Parallel resonance refers to the phenomenon in which the voltage at the circuit end and the total current are in phase in a resistor,
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Calculation of series resonant withstand voltage frequency and current
2025-08-28Wuhan UHV specializes in producing series resonance (also known as power frequency withstand voltage test equipment). Next, we will share with you the frequency and current calculation of series resonance withstand voltage.At present, there are three common types of communication testing devices:1. Power frequency AC withstand voltage device. 2. Inductive series resonant withstand voltage device.3. Frequency modulation series resonant withstand voltage test device. Due to its large and bulky size, the power frequency AC withstand voltage device is rarely used on site and is only used during the withstand voltage test of electrical equipment at a voltage level of 10kV. The inductive type has been abandoned due to its use of adjustable iron core air gap reactors, which have disadvantages such as high noise, complex structure, and bulky equipment. IEC517 and GB7674 consider that the test frequency in the range of 10-300Hz is basically equivalent to the power frequency voltage test, so c
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AC withstand voltage test overcurrent protection setting value
2025-08-28Wuhan UHV specializes in producing series resonance (also known as AC withstand voltage test equipment). Next, we will share with you the overcurrent protection setting values for AC withstand voltage test.The voltage, waveform, frequency, and distribution of the internal voltage of the tested insulation in the AC withstand voltage test all conform to the actual situation when operating under AC voltage, and can truly and effectively detect insulation defects. It is one of the methods to test the insulation withstand overvoltage ability of the tested insulation and has important significance for ensuring the safe operation of equipment.In the process of AC withstand voltage of electrical equipment, in order to ensure that the test power can be quickly and reliably cut off in case of short circuit and breakdown of the test object during the test, we must set the overcurrent protection setting in advance.According to engineering experience, the overcurrent protection setting is generally
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Series resonant harmonic control method
2025-08-27Wuhan UHV specializes in producing series resonance devices (also known as variable frequency series resonance devices). Next, we will share with you the methods for controlling series resonance harmonics.At present, there are four basic methods to deal with the problem of series resonant harmonic control. It is generally divided into two parts to focus on: unified centralized management of substations and on-site decentralized processing of nonlinear electrical equipment. We generally follow the principle of whoever pollutes controls it, and we need to handle non-linear electrical equipment in a decentralized manner on-site. Yes, a large number of scattered civilian equipment can only be centrally managed. 1、 Increase system capacityThis method improves the harmonic anti-interference performance of nonlinear electrical equipment by reducing the system impedance, popularizing the capacity of the power supply through series resonance, and then popularizing the level of the power supply
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Application of power cables in series resonant power systems
2025-08-27Wuhan UHV specializes in producing series resonance (also known as series resonance test device). Next, we will share with you the application of series resonance in power cables in power systems.As is well known, power cables are high-capacity electrical equipment in the power system. Before being laid and put into operation, power cables need to undergo voltage withstand tests to ensure their integrity. However, traditional voltage withstand equipment has a small capacity and cannot meet the requirements of long-distance cable voltage withstand tests. At this time, it is necessary to utilize resonance, which has both advantages and disadvantages in the power system.We know that when the circuit frequency, inductance, and capacitance satisfy the resonance condition, the circuit resonates, and the voltage on the test sample is Q times the output voltage of the excitation transformer high voltage end. Q is the system quality factor, which is the voltage resonance multiple, generally ran
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Common fault phenomena and diagnostic methods of series resonance
2025-08-27Wuhan UHV specializes in producing series resonance (also known as series resonance withstand voltage equipment). Next, we will share common fault phenomena and diagnostic methods of series resonance with you.1、 Instrument tuning failed1. Is the instrument and test sample reliably grounded2. Check if there are any broken wires in the reactor and transformer connections of this device. 3. Check the excitation transformer of this device: there are two methods of judgment① Measure the resistance of the transformer winding tap with a multimeter in 2k range. If there is an open circuit, it indicates a broken wire and a faulty transformer. ② After resonance, use a multimeter to measure whether there is voltage at the output tap of the excitation transformer. If not, it will cause tuning failure. 4. Check the reactor of this device:Use a multimeter to measure whether the resistance values at both ends of the reactor match the test report, and whether the resistance values between the react
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What are the characteristics of the AC/DC voltage withstand test device
2025-08-26Wuhan UHV specializes in producing series resonance (also known as AC/DC withstand voltage test device). Next, we will share with you the characteristics of the AC/DC withstand voltage test device.When the capacitance calculation reactance XC is equal to an inductance reactance XL, that is, the voltage U in XC=XL, the circuit and current pass through the same phase, and the circuit presents pure resistance This phenomenon is called series resonance. If a series system resonance occurs in a circuit, the impedance of circuit Z=√ R2XC-XL2=R, the minimum value of the total impedance in the circuit, and the current will reach this maximum value danger When resonance occurs, due to the presence of equivalent inductance and capacitance, the root mean square voltage across the inductance and capacitance is equal to ul=uc. High voltage wireless phase analyzer receiving system host safety check: Long press the "on/off" button to turn on the device, the screen displays normally, and the power co
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What should be noted for power frequency withstand voltage test equipment
2025-08-26Wuhan UHV specializes in producing series resonance (also known as power frequency withstand voltage test equipment). Next, we will share with you what to pay attention to for power frequency withstand voltage test equipment.1、 Preparation before the experiment1. There should be no less than 2 experimental researchers. Strictly follow the safety operating procedures for high-voltage testing when using2. In order to ensure the safety and correctness of the experiment, in addition to being familiar with the product design manual, we must also strictly follow the relevant technical standards and regulations developed by the country for analysis and testing operations; 3. When opening the packaging box, the tester should inspect the equipment according to the packing list. If the equipment is found to be inconsistent with the packing list, please contact Guodian Gaoxi immediately;4. The series resonance test device should be able to be used by professional technical personnel in high-volt
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