Who knows what are the characteristics of the variable frequency series resonant complete test set?

The complete set of frequency modulation series and parallel resonance test device uses the principle of series resonance, by adjusting the output frequency of the frequency conversion controller, so that the inductance L of the reactor in the loop and the capacitance c of the sample product resonate in series, and the resonant voltage is the voltage applied on the sample.

The frequency modulation series and parallel resonance test device is widely used in electric power, metallurgy, petroleum, chemical and other industries, and is suitable for large capacity.

High-voltage capacitive test products, such as generators, transformers, GIS, high-voltage cross-linked cables, transformers, bushings, etc.

Trials and preventive trials.

In terms of frequency modulation series and parallel resonance high-voltage test, our company has developed its own frequency modulation and voltage regulation software technology, which is ahead of the country.

In the internal high voltage test industry, this technology is used to use 16-bit fine frequency modulation, 10kHz carrier frequency, SPWM and imported original IPM

The overall module design, the manufacturing of frequency modulation series and parallel resonance high-voltage test device, frequency conversion series resonance complete set of test device, what is the work.

How does it work? It is fully in line with the national regulations and requirements for high-voltage testing.

High stability and reliability. The system adopts imported power components as the core of power conversion, the voltage output and frequency output are stable, the electromagnetic compatibility design is reasonable, the protection function is perfect, and the system is still intact after many high-voltage direct short-circuit tests, and the system also has a strong overload capacity.

Auto-tune is powerful. When the system is automatically tuned, it automatically sweeps the frequency from 30Hz to 300Hz, and displays the sweep curve, so that the user can intuitively see the system tuning process; After the sweep is completed, the system scans the frequency for resolution in the 5hz range according to the resonant frequency point initially found by the sweep, and finally accurately locks the resonant frequency.

Supports a variety of trial modes. The system supports "automatic tuning, manual voltage regulation", "automatic tuning, automatic voltage regulation", "manual tuning, manual voltage regulation" and other test modes, and it is recommended to use the "automatic tuning manual voltage regulation" mode, which can not only quickly find the resonance point, but also control the test process through manual voltage regulation, which is more safe.

The system has a friendly human-computer interface. Test parameter setting, test control, test results and other data display on the same screen, intuitive and clear, and with automatic timing and operation prompt functions. Full touch screen operation and display, with test data saving and query functions.

The protection function is perfect. It has the functions of zero protection (when the voltage output control knob is not in the zero position, the system is prohibited from starting), over-voltage protection, over-current protection, flashover protection and other functions to ensure the reliability of the system.

Wuhan Sanxin power equipment manufacturing **** professional design and production, you can learn more about it.

Variable frequency series resonance test complete set of device is an indispensable test method for the daily debugging of electrical equipment, and the circuit of the complete set of frequency conversion series resonance test is well used in the withstand voltage test of electrical equipment such as transformers and power cables. This paper mainly introduces the physical application of the circuit of the complete set of variable frequency series resonance test.

1) AC withstand voltage test of power cable, at present, there are more and more XLPE-XLPE insulated power cables at home and abroad to replace the original oil-filled paper insulated power cables. However, there are many problems in the DC withstand voltage test of traditional XLPE cables; Because the cross-linked cable is a large capacitance test, the use of series resonance test method is simple and convenient, and good AC voltage frequency and waveform can be obtained, which has become an ideal test method in the AC withstand voltage test of cross-linked cable.

2) AC withstand voltage test of power transformer, reactor and transformer, the world clearly stipulates that the AC withstand voltage test of power transformer, reactor and transformer can be used to use power frequency voltage test or induced voltage test method, and the test voltage waveform should be as close to sinusoidal as possible. According to this standard, the circuit of the complete set of variable frequency series resonance test device can be tested under any conditions. The device has a wide frequency and voltage range, is highly adaptable to the test object, and can be used with a wide range of voltage levels of test objects.

3) AC withstand voltage test of SF6 closed combiner, AC withstand voltage test is an important method to check the GIS main insulation when SF6 is closed. In most cases, a series resonant test setup is used.

4) AC withstand voltage test of other equipment, for circuit breakers, bushings and other equipment, it is generally required that the withstand voltage test is a power frequency voltage test. If the power frequency test device cannot meet the on-site requirements, the resonant withstand voltage test method can also be used instead. When the resonance withstand voltage test is adopted, the test frequency is higher due to the small capacitance of the device, but the series resonance test device can also use appropriate compensation capacitance to reduce the test frequency, so that the instrument can reach the test frequency close to the power frequency.

Respondent: Huatian Power.

The complete set of variable frequency series resonance test device is composed of variable frequency power supply, excitation transformer, high-voltage reactor and capacitance voltage divider; The complete set of frequency conversion series resonance test device adopts the method of adjusting the frequency of the power supply, so that the reactor and the tested capacitor can achieve resonance, and obtain high voltage and high current on the tested product. The capacitance and reactor of the sample are connected in series resonance, the voltage divider is connected in parallel with the sample, and the resonant voltage is measured by the complete set of frequency conversion series resonance test device, and the overvoltage protection signal is issued; The excitation transformer couples the FM power output to a series resonant circuit to provide the excitation power of the series resonant.

The complete set of frequency conversion series resonance test device has a high degree of automation, small size and light weight. The weight of each unit of the complete set of equipment does not exceed 40kg, which is suitable for on-site handling. The reactor adopts dry epoxy casting, which is reliable in operation and easy to handle, and the on-site test does not need to be hoisted, and the installation test can be carried out manually.

Inverter series resonance test equipment is widely used in electric power, metallurgy, petroleum, chemical and other industries.

Functional characteristics of the complete set of frequency conversion series resonance test device:

1. High stability and reliability, the system adopts imported power components as the core of power conversion.

2. The automatic tuning function is powerful, and the frequency sweep curve is displayed between 30 Hz and 300 Hz when the frequency conversion series resonance test system is automatically tuned.

3. Support a variety of test modes, the system supports the test modes of "automatic tuning manual voltage regulation", "automatic tuning automatic voltage regulation" and "manual tuning manual voltage regulation".

4. The system has a friendly human-machine interface, test parameter setting, test control, and equivalent screen display of test results, which is intuitive and clear, and has the functions of automatic timing and operation prompts.

5. The protection function is perfect, and the complete set of frequency conversion series resonance test device has the functions of zero protection, overcurrent protection, overvoltage protection, flashover protection, etc., which ensures the reliability of the system.

Advantages of series resonance in power system applications:

The required power capacity is greatly reduced. The series resonant power supply is to use the resonant reactor and the capacitance resonance of the tested product to generate high voltage and large current, in the whole system, the power supply only needs to provide the active consumption part of the system, therefore, the power supply power required for the test is only 1 q of the test capacity.

The weight and volume of the equipment are greatly reduced. In the series resonant power supply, not only the cumbersome high-power voltage regulating device and the high-power test transformer are omitted, but also the resonant excitation power supply only needs 1 q of the test capacity, so that the weight and volume of the system are greatly reduced, generally 1 5-1 30 of the ordinary test device

The waveform of the output voltage is improved. The resonant power supply is a resonant filter capacitor, which can improve the waveform distortion of the output voltage and effectively prevent the accidental breakdown of the harmonic peak to the sample.

Prevent large short-circuit currents from burning the point of failure. In the series resonance state, when the insulation weakness of the test product is broken down, the circuit is immediately detuned, and the loop current rapidly drops to 1 q of the normal test current. When the withstand voltage test is done in parallel resonance or test transformer mode, the breakdown current immediately rises dozens of times, and compared with the two, the short-circuit current and breakdown current differ by hundreds of times.

Therefore, series resonance can effectively find the insulation weakness, and there is no worry about the fault point of large short-circuit current burns.

There will be no recovery overvoltage. When the breakdown occurs in the sample, due to the loss of resonance conditions, the high voltage also disappears immediately, the arc is extinguished immediately, and the re-establishment process of the recovery voltage is very long, it is easy to disconnect the power supply before reaching the flashover voltage again, and the recovery process of this voltage is an intermittent oscillation process of energy accumulation, and the process is long, and there will be no recovery overvoltage.

The model of the complete set of frequency conversion series resonance test device is shown below.

Technical characteristics: 1. Reliable quality to ensure the safety of test personnel, tested products and test equipment itself;

2. Small size, light weight, especially suitable for on-site use;

3. It can flexibly set the experimental voltage, frequency modulation range and pressurization time;

4. It has a computer communication interface, which is convenient for communication and test data management;

5. High resolution, frequency resolution;

6. Meet the requirements of the national standard: it has the function of monitoring peak 2, which can monitor the test waveform in real time;

7. Overvoltage, overcurrent, discharge, overheat and zero start protection are comprehensive and reliable, and the action time is 1 microsecond;

8. The equipment comes with a micro printer, which can print and save the test data in time;

9. According to the standard anti-vibration and dust-proof design, resistant to long-distance transportation and harsh use environment;

10. One-key mouse knob"Fool-style"Operation, large-screen LCD display test data, test status, and real-time operation step prompt function;

11. Software calibration function, convenient for users to calibrate the meter to ensure the accuracy of high voltage value;