Device Introduction
The TZXZB-75kVA/75kV/1A variable frequency series resonant test device is equipment used for AC withstand voltage tests using variable frequency voltage regulation. The device utilizes the principle of series resonance, allowing tests equivalent to 30 to 150 times the capacity of the power supply to be completed with a smaller capacity power source, greatly alleviating the problem of insufficient power supply capacity for on-site tests. This instrument is widely used in fourth and fifth grade power installation (repair, test) enterprises, power supply, power generation, railways, steel, petrochemicals, mining, and power transmission and transformation equipment manufacturing industries. It is suitable for large-capacity, high-voltage capacitive test objects at voltage levels of 6kV to 35kV, such as generator sets, high-voltage cross-linked cables, power transformers, high-voltage instrument transformers, high-voltage circuit breakers, high-voltage bushings, and other equipment for commissioning tests and preventive tests.
Working Principle
The variable frequency series resonant test device applies the principle of series and parallel resonance. It uses an excitation transformer to excite the resonant circuit, adjusts the output frequency of the variable frequency voltage regulating power supply, so that the loop inductance L and the test object C resonate in series, and the resonant voltage is applied to the test object, causing the high voltage on the test object to reach the required voltage value.
Product Features
1. The complete set of devices is small in size, light in weight, and easy to carry. The variable frequency voltage regulating power supply uses imported power components as the core of power conversion, with stable voltage output and frequency output, reasonable electromagnetic compatibility design, complete protection functions, and strong overload capacity.
2. The device has powerful automatic tuning functions. During automatic tuning, it automatically sweeps frequencies from 30Hz to 300Hz, allowing users to visually observe the tuning process; after the sweep is completed, the system performs a fine frequency sweep within a range of ±5Hz around the initially found resonant frequency point with a resolution of 0.01Hz, and then accurately locks onto the resonant frequency.
3. The device can flexibly set the test voltage, frequency range, and pressurization time. It supports test modes such as "automatic tuning + manual voltage regulation", "automatic tuning + automatic voltage regulation", and "manual tuning + manual voltage regulation". The "automatic tuning + manual voltage regulation" mode is recommended, as it can quickly find the resonant point and also control the test process through manual voltage regulation, providing higher safety.
4. The device uses a large-size color screen to display test data and test status, and has real-time operation step prompts. Test parameter settings, test control, and test results are displayed on the same screen, which is intuitive and clear, and it has automatic timing and operation prompt functions. The test results can calculate the capacitance value of the test object. It comes with a built-in micro printer and has test data printing capabilities.
5. The device has comprehensive protection functions, ensuring high safety and reliability. It has overcurrent, overvoltage, and flashover protection functions, effectively protecting personal and equipment safety.
Equipment Composition
The complete set of equipment mainly consists of 1 variable frequency voltage regulating power supply, 1 excitation transformer, 3 high-voltage reactors, 1 capacitive voltage divider, and 1 accessory box.
Technical Specifications
1. Instrument working power supply: AC220V±10% single phase, 50Hz
2. Power supply voltage: AC380V±10% single phase, 50Hz
3. Output voltage: 75kV
4. Output capacity: 75kVA
5. Output frequency range: 30Hz to 300Hz
6. Device measurement accuracy: 1.0 level
7. Continuous test time: >60min
8. Frequency adjustment resolution: 0.01Hz
9. Output waveform: sine wave, waveform distortion rate ≤0.5%
10. Frequency adjustment sensitivity: 0.1Hz, instability ≤0.5%
11. System quality factor: 20 to 60
Note: The product appearance is subject to the actual product. Technical parameters and models are subject to change without prior notice.
