Variable-frequency series resonance test device for substation. This series of withstand voltage devices are mainly designed and manufactured for AC withstand voltage test of primary electrical equipment in substations of 220kV and below. Satisfy the AC withstand voltage test of capacitive equipment such as transformers, GIS systems, SF6 switches, cables, bushings, etc. according to regulations. It can not only meet the requirements of high voltage and small current equipment test conditions, but also meet the requirements of low voltage and large current equipment test conditions. It has a wide range of applications and is suitable for local, city and county high-voltage test departments and power installations. , Repair and test engineering units.
This product is mainly composed of a variable frequency control power supply, an excitation transformer, a reactor, and a capacitor divider. Among them, the variable frequency control power supply adopts imported special SPWM digital waveform generator chip, the frequency resolution is 16 bits, and the frequency fineness can reach 0.1Hz at 20～300Hz. At the same time, the orthogonal non-synchronous fixed carrier modulation method is adopted to ensure the The output waveform is good in the entire frequency range; the power part adopts the IPM module to ensure the stability and safety of the instrument.
Product nickname: substation resonance
Reactors of the same voltage level and capacity are smaller in size and lighter in weight;
The temperature rise is small at rated load;
Using dry epoxy casting, high mechanical strength, good electrical insulation performance, beautiful and reliable;
The variable frequency control source has a large capacity margin;
Strong protection function, good output waveform and good stability;
With multiple working modes, easy to operate;
It adopts 220V or 380V single-phase power supply, which is convenient to get electricity on site.
The configuration is flexible, and different types of reactors can be selected to meet the requirements of different test products, realize one machine with multiple functions and high cost performance.
Performance characteristics:
Placement method: The placement of the variable frequency power supply is vertical and horizontal, which is especially suitable for on-site operation and observation.
Anti-vibration protection: Special shock-absorbing rubber support feet and protective aluminum boxes are provided inside and outside, which can effectively reduce the bumps and vibrations during transportation and the impact during lifting. To ensure the long-term stability and reliability of the variable frequency power supply.
Parameter display: touch or external mouse large-screen LCD interface display system.
Can display resonance voltage (that is, the target voltage set before the test), test frequency, measurement frequency, low voltage voltage, low voltage current, withstand voltage time, overvoltage protection, overcurrent protection, flashover protection, stage boost and stage timing, operation Mode switching, capacitance, inductance, frequency interchange calculation, parameter query, etc.,
It can display frequency curve, voltage curve, etc. It can intuitively judge the accuracy and stability of the resonant frequency of the current test.
Parameter setting: large-screen touch LCD color screen and external mouse directly complete the setting of various parameters.
It can control the start frequency, stop frequency, start voltage, stage boost and timing, measure the voltage divider ratio, excitation transformation ratio, overvoltage protection, overcurrent protection, flashover protection, test mode, capacitance and inductance frequency mutual Change calculations, parameter setting prompts and help parameters for setting or selection.
Test mode: touch screen and external mouse operation, there are three operating states: fully automatic, semi-automatic and manual. It has the functions of boosting, tuning (including manual and automatic), segmented pressure and timing, operating status, mode switching, fault prompt, capacitor and inductor frequency interchange calculation functions.
Protection function and information prompt: with high-voltage over-voltage protection, low-voltage over-current, over-current protection, and multiple protection functions such as detuning protection, zero position, flashover protection, emergency shutdown, under-voltage protection, etc.
Data storage function: test results save, print, upload, back-check, etc.
a. Test result: After the manual or automatic test is completed, the detailed parameters of the test can be displayed in the test result interface. When the test is interrupted, the interruption status can be prompted. The parameters can be saved in the memory, which is a non-volatile memory and can save 50 test records.
b. Data query: The saved test result data can be displayed on the screen. At the same time, it has a USB interface, which can output and print data or use the printer carried by the device to print.
Automatic voltage stabilization function: The system automatically tracks and maintains a stable test voltage according to the set test voltage or the result of manual boosting, and the voltage stability can reach 1.5%.
Both the frequency modulation range and frequency resolution can be set: the frequency modulation range can be set to 20～300Hz, 45～65Hz, 50Hz, and can be set as required, which can speed up the tuning process; the frequency resolution can be preset to 0.1Hz, 0.2Hz as required , 1.0Hz, or 2.0Hz to achieve an optimal balance between tuning efficiency and tuning accuracy.
Frequency adjustment is divided into coarse adjustment and fine adjustment, and can automatically find the test resonance point to ensure that the resonance frequency does not drift during the entire test process.
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