Product List
Contact Us
Email：qiao@hvtest.cc
Mobile：+8615871365102
What's app：+8615871365102
-
What are the advantages of motor test benches in power systems?
2025-09-17A motor test bench is an integrated testing platform that combines power sources, loads, measurement systems, controls, and data acquisition. It is primarily used for type tests, factory acceptance tests, commissioning tests, and performance verification of rotating electrical machines such as generators and motors after maintenance.Its advantages in power systems can be elaborated from multiple perspectives, centering on ensuring system safety, improving economic efficiency, and driving technological progress.1. Advantages for Power System Safety and StabilityThis is the most critical and essential value of motor test benches.1）Fault Prediction and Prevention: Before a motor is connected to the grid, rigorous tests (such as temperature rise tests, overload tests, insulation withstand voltage tests, and short-circuit characteristic tests) can identify potential design, material, manufacturing, or installation defects and weaknesses. This prevents "operating with hidden faults," avoidin
MORE -
What should be noted when using a motor test bench
2025-09-17Using a motor test bench is a highly cautious and professional task that involves three core aspects: personal safety, equipment protection, and data accuracy. The following are key points that require special attention.1、 Safety First: Core Security Standards1. Electrical safety:Grounding protection: Ensure that all equipment on the test bench (power supply, dynamometer, frequency converter, electrical parameter meter, etc.) have good and reliable grounding wires. This is the lifeline to prevent electric shock accidents.Insulation inspection: Before connecting the tested motor, check the insulation resistance of its winding to the casing (using a megohmmeter) to ensure good insulation and prevent leakage or short circuit.Anti electric shock: All high-voltage wiring and exposed terminals must be covered with insulation shields. When wiring, disconnecting or changing the circuit, the power must be completely cut off and a "Do not close" warning sign must be hung. Operate after dischargi
MORE -
Safety operating procedures for motor test bench
2025-09-17As a key equipment for motor performance testing, the safe operation of the motor test bench is a prerequisite for ensuring the safety of laboratory personnel and equipment. This article will provide a detailed explanation of the safety operating procedures for the motor testing bench, in order to enhance the safety awareness of operators and reduce the possibility of accidents.1、 Equipment inspectionBefore conducting any experiments, operators should conduct equipment checks on the motor test bench to ensure that all equipment is in good condition. Specifically, it includes:1) Power systemEnsure that the power cord is securely connected and there are no worn or exposed cables. Check if the power switch and emergency stop button are flexible and reliable.2) Mechanical structureCheck whether the transmission system, bearings, and connecting components are loose or worn. Ensure sufficient lubrication of the mechanical parts.3) Control systemCheck if the buttons, switches, and indicator l
MORE -
Working principle of fully automatic motor test bench
2025-09-17The motor test bench is an important equipment in the field of motor manufacturing and testing. It can comprehensively and accurately evaluate motors by integrating various testing functions. This article will delve into the working principle of the motor test bench.1. Structure and compositionMotor architectureThe basic architecture of the fully automatic motor comprehensive test bench includes mechanical structure, electrical system, and automatic control system. Mechanical structures are usually composed of motor brackets, rotors, sensors, measuring instruments, etc. The electrical system includes motor windings, power supply, frequency converter, etc., while the automatic control system is the brain of the entire test bench, responsible for coordinating and monitoring the operation of each part.Sensors and measuring instrumentsThe test bench is equipped with various sensors to monitor the operating status of the motor. These sensors include but are not limited to temperature sensor
MORE -
What are the contents usually included in the test report of the motor test bench
2025-09-17The motor test bench test report is a comprehensive and structured document used to record the performance, quality, and compliance of the motor under specific testing conditions. It is not only the final output of testing work, but also the key basis for product acceptance, quality traceability, and problem analysis.A professional motor testing report typically includes the following core contents:1. Report informationReport number, product model, serial numberTest date and testing criteria2. Test objectKey parameters such as motor model, rated power, rated voltage, and rated speed.3. Main testing equipmentList key instruments (such as dynamometers, power analyzers) along with their identification numbers and calibration status.4. Test items and resultsNo load characteristics: No load current, No load loss.Load characteristics: efficiency, power factor, speed vs torque curve.Locking test: starting torque, starting current.Temperature rise test: winding temperature rise (Δ T).Insulatio
MORE -
Four types of voltages that the series resonance test device can withstand
2025-09-17The insulation structure of electrical equipment can withstand the following four voltages during operation:1. The insulation structure of electrical equipment must be able to withstand the maximum working voltage of the power frequency for a long time throughout the entire operation process. Usually referred to as the maximum operating voltage of the system, it is usually 1.15 times the rated voltage.2. Transient overvoltage, including rising frequency voltage and resonant overvoltage, is caused by the capacitance effect, load shedding, and asymmetric grounding of the no-load line in the resonant AC power frequency voltage of the series resonance test device. When the load suddenly unloads, due to the fact that there is only one unloaded transmission line in the power supply, and the grounding reactance of the transmission line can be represented by X0, the current flowing through the internal resistance of the power supply becomes a capacitive current. This current flows through the
MORE -
Precautions for the use of variable frequency series resonant devices
2025-09-17Precautions for the use of variable frequency series resonant devices:1. Before conducting a voltage withstand test using a variable frequency series resonant device. Please measure the insulation resistance of the test sample according to the test procedure and confirm that it meets the relevant insulation requirements before proceeding to the next step of the voltage withstand test.2. Before conducting a voltage withstand test and starting the frequency converter series resonant device, please recheck if the wiring is correct. For example, the voltage output terminal of the excitation transformer should be connected to the lower end of the lowest level reactor using a grounding cable. The high-voltage output line at the upper end of the upper level reactor should be suspended as much as possible from the ground or surrounding objects to prevent the high-voltage line from discharging to the ground or objects. Every small mistake you make can cause irreparable damage to equipment and p
MORE -
Working principle of variable frequency series resonance test device
2025-09-17The variable frequency series resonance test device applies the working principle of knowledge series resonance. The excitation transformer can excite the series resonance control circuit, adjust the output signal frequency of the variable frequency controller, and make the circuit inductance L and the test sample C resonate in series. The resonance voltage is the voltage applied to the test sample. During the operation of power equipment, insulation materials gradually degrade under the action of temperature, electric field, and mechanical vibration for a long time, including overall and local degradation, resulting in defects. For example, due to the concentration of local electric fields or weak local insulation, there are local defects. Various preventive testing methods can detect some defects and reflect the condition of insulation materials. However, the test voltage of the testing method is often lower than the working voltage of the power equipment, which is not enough to ens
MORE -
Safety measures and operating precautions for transformer test bench
2025-09-16The transformer comprehensive test bench under UHV power can help many power workers conduct various power tests more conveniently.Safety measures for transformer test bench1. Before using this instrument, it is necessary to carefully read this manual.2. The operator of the instrument should have general electrical knowledge.3. The transformer comprehensive test bench should be used in places that are not exposed to rain, corrosive gases, excessive dust, high temperatures, direct sunlight, etc.4. Instruments should avoid severe vibrations.5. After the test is completed, be sure to wait for the discharge alarm to stop before turning off the power and removing the test line.6. When measuring an unloaded voltage regulating transformer, be sure to wait for the discharge indicator alarm sound to stop before switching gears.7. During the testing process, it is prohibited to move the test clamp and power supply line.Precautions for transformer characteristics comprehensive test bench1. It is
MORE -
Application scenarios and analysis of transformer comprehensive testing bench
2025-09-16Transformer comprehensive testing bench (or transformer comprehensive tester) is a device used for comprehensive testing and analysis of transformer performance. It can play an important role in various situations, and the following are some typical application scenarios:1. Quality control before leaving the factorySituation description:After the completion of transformer production, manufacturers need to ensure that each transformer meets quality standards and technical specifications to ensure the reliability and safety of the product.Analysis:The transformer comprehensive testing platform can conduct comprehensive pre factory tests on transformers, such as no-load tests, short-circuit tests, DC resistance tests, insulation resistance tests, etc. These tests can evaluate the performance parameters of the transformer, such as no-load loss, short-circuit loss, power factor, etc., to ensure that the transformer meets the design requirements.2. Preventive maintenance and fault diagnosisS
MORE -
What are the differences between transformer comprehensive test bench and ordinary testing equipment?
2025-09-16We all know that transformers are devices that convert high voltage into low voltage or low voltage into high voltage to meet the needs of different voltage levels in power systems. They are widely used in power systems, and in order to ensure the normal operation of transformers, it is often necessary to use transformer testing equipment to test them. Among them, there is a device called transformer comprehensive test bench. Compared with many other transformer testing equipment, what are the advantages of transformer comprehensive test bench?The advantages of the transformer comprehensive test bench compared to other power testing instruments are mainly reflected in these five points:1. Scope of testingThe transformer comprehensive test bench can perform various tests, including transformation ratio test, no-load loss test, short-circuit impedance test, insulation resistance test, partial discharge test, etc. However, ordinary testing equipment can usually only perform a single test
MORE -
How to Maintain a Transformer Comprehensive Test Bench Daily?
2025-09-16Daily maintenance of the transformer comprehensive test bench is key to ensuring its measurement accuracy, stability, and prolonging equipment life.1.Cleaning and Visual Inspection:Cleaning: Use a dry, soft cloth to gently wipe dust and oil stains from the test bench surface, display screen, and test lead clips. Never use any corrosive chemical solvents or spray a wet cloth directly onto the equipment to prevent liquid from seeping inside and causing short circuits or corrosion.Visual Inspection: Carefully check test leads, power cords, and ground wires for damage, aging, exposure, breakage, or signs of burning. Inspect test clips for looseness, oxidation, or breakage.2.Connection Check:Before Connection: Ensure all connections are correct and secure. Pay special attention to the ground wire, which must be reliably connected to an earth ground rod. This is the primary condition for ensuring personal safety and measurement accuracy.After Connection: Before powering on, double-check that
MORE -
Application Fields of Transformer Comprehensive Test Benches
2025-09-16A transformer comprehensive test bench is a high-precision, automated testing device that integrates multiple testing functions. It is primarily used for comprehensive factory inspection and maintenance verification of the electrical performance, mechanical performance, and protection performance of transformers (including power transformers, distribution transformers, special transformers, etc.).Its core application fields can be divided into the following categories:1. Power Transformer Manufacturing Industry (Core Application)This is the primary and largest application field for transformer comprehensive test benches. After transformer production is completed, strict factory tests must be conducted to ensure they meet national standards (e.g., GB), international standards (e.g., IEC), and customer-required performance indicators.Routine Tests: Tests that must be performed on every newly manufactured transformer.Type Tests: More comprehensive tests conducted on new product prototypes
MORE -
What factors affect the results of the variable frequency series resonance test?
2025-09-16What factors affect the results of the variable frequency series resonance test? These uncertain factors include:1. The influence of test time: As the test process progresses for a long time, the equipment gradually heats up, the equivalent resistance increases, and the Q value also decreases. During the high heat period, this phenomenon is very important. Generally, the equipment needs about half an hour of rest before it can continue to be used.2. The influence of weather: Under high humidity conditions, the corona loss of wires increases significantly, the interference of surrounding electromagnetic fields increases, and the Q value decreases. When the temperature is high, the equivalent resistance of the circuit increases significantly, and the Q value decreases.3. The impact of not selecting a good resonance point for high-voltage testing frequency on Q value: It has been found in applications that when the voltage rises close to the test voltage, the voltage rises too quickly, ac
MORE -
Principle and operation method of series resonance test device
2025-09-16Basic principle of series resonance test deviceThe series resonance test device usually includes a frequency modulation power supply, a resonant reactor, an excitation transformer, and a voltage divider, among which the series resonance circuit is composed of a capacitor and a resonant reactor. The capacitor voltage divider is connected in parallel with the test object to measure its resonant voltage value, and is also used for overvoltage protection signal; The frequency and voltage regulation power is coupled to the series resonant circuit through an excitation transformer to provide excitation power for it.Operation method of series resonance test deviceBefore the experiment, the test voltage should be determined based on the test sample, and the capacitance of the test sample should be measured or consulted to determine its capacitance. Then select the appropriate parameters (inductance, rated current, rated voltage) and quantity of resonant reactors for testing and wiring. (1) Co
MORE -
How to conduct AC withstand voltage test for series resonant device?
2025-09-16The method of using a series resonant device for AC withstand voltage testing is to change the inductance and frequency of the test circuit to make it in a resonant state. This method can meet the testing requirements of high voltage and high current. When using a series resonant device for AC withstand voltage testing, the following points should be noted:1. Before conducting the experiment, it is necessary to know whether the non-destructive testing items of the tested equipment are qualified. If there are any defects or abnormalities, they should be eliminated before proceeding.2. The experimental site should be fenced and warning signs hung. And there is a dedicated person to supervise.3. Wipe the insulation surface of the tested equipment before testing, and ensure that the tested product casing and unmeasured winding are reliably grounded. For multi oil equipment, it should be left to stand for a certain period of time before testing.4. Adjust the gap between the protective balls
MORE -
What are the differences between series resonance and parallel resonance
2025-09-15The difference between series resonance (also known as variable frequency resonance) and parallel resonance:Difference 1: Different load resonance modes. The load resonance modes of series resonance and parallel resonance can be divided into two types: series inverters and parallel inverters. The difference between these two types lies in their technical characteristics and oscillation circuits. Series inverters use L, R, and C in series, while parallel inverters use L, R, and C in parallel. The impedance rates of these two types of load circuits to the power supply are also different. Series inverters have low impedance, while parallel inverters have high impedance; When the series inverter has low impedance, a voltage source is required for power supply, which leads to the need to connect a large filtering capacitor to the rectified and filtered DC power supply terminal. When the inverter fails, it will cause an increase in surge current, making protection difficult; When the parall
MORE -
Do you know the function of the variable frequency series resonant withstand voltage test circuit?
2025-09-15The frequency conversion series resonance withstand voltage test is an indispensable testing method for the daily debugging of electrical equipment.(1) AC voltage withstand test for power cables. The traditional DC withstand voltage method has many problems in the testing of cross-linked cables. Due to the fact that cross-linked cables are high-capacity test samples, the frequency conversion series resonance withstand voltage test method is simple and convenient. It can also obtain good AC voltage frequency and waveform, making it the most ideal testing method for AC withstand voltage testing of cross-linked cables at present.2) AC withstand voltage test for power transformers, reactors, and transformers. The AC withstand voltage test for power transformers, reactors, and transformers has been clearly defined internationally. Both the power frequency voltage test method and the induced voltage test method can be used, and the test voltage waveform should be as close to sine as possible
MORE -
Basic principle of series resonant withstand voltage test device inverter
2025-09-15The series resonant withstand voltage test device is usually accompanied by an inverter, and this combination is called the series resonant withstand voltage test device inverter. Below is an introduction to the basic principle of the series resonant withstand voltage test device inverter:Inverter structure of series resonant withstand voltage test deviceFrom the figure, we can see some basic principles of the series resonant withstand voltage test device inverter. Firstly, it includes a DC voltage source, an inverter bridge consisting of switches S1 to S4, and a series resonant withstand voltage test device load consisting of R, L, and C; Among them, switches S1 to S4 can be selected from IGBT, SIT, MOSFET, SITH, and other power semiconductor devices with self turn off function, and the inverter is a single-phase full bridge circuit; The control method is that the driving signals of the two switching devices on the same bridge arm are complementary, and the two diagonally opposite swi
MORE -
The advantages of series resonance in power systems
2025-09-12The advantage of a series resonant (also known as an AC withstand voltage test device) circuit is that it allows for the use of smaller capacitor values, and if the capacitors are matched with appropriate inductance and resistance values. A smaller capacitor value can be used to generate series resonance effect, and the smaller the capacitor, the more accurate the circuit. For example, one-fifth of the common value of a capacitor requires a tolerance of about 10% for the capacitor and inductor components, and one tenth of the normal value of a capacitor requires a tolerance of ± 5%, and so on. It is difficult to achieve high-frequency inductors with such strict tolerances. If you think the layout inductance is fixed and plan a smaller capacitance value to place the series resonance point in the correct position. You will face the same difficulty: you cannot easily control the precise values of capacitors and inductors.Resonance must continue and repeat without interruption or space. If
MORE
