Motor Power Frequency (AC) Withstand Voltage Test Device
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Features:
1. Automatically find the resonant frequency, automatically boost, step down, and time the withstand voltage. During automatic tuning, the system sweeps from 30Hz to 300Hz and finally locks the resonant frequency precisely.
2. Supports multiple test modes: "automatic tuning + manual voltage regulation", "automatic tuning + automatic voltage regulation", "manual tuning + manual voltage regulation", etc.
3. The system has a friendly human-machine interface: test parameter settings, test control, and test results are displayed on the same screen, which is intuitive and clear, and has automatic timing and operation prompt functions.
4. Complete protection functions. Overvoltage protection, overcurrent protection, flashover protection, and zero-position protection ensure the reliability of the system.
5. The system uses imported power components, stable voltage output and frequency output, reasonable electromagnetic compatibility design, and complete protection functions.
6. After multiple high-voltage direct short-circuit tests, the system remains intact, and the system also has strong overload capacity.
Equipment Introduction
The motor power frequency (AC) withstand voltage test device consists of a variable frequency power supply, an excitation transformer, a high-voltage reactor, and a capacitive voltage divider. The capacitance of the test object and the reactor form a series resonant connection; the voltage divider is connected in parallel to the test object to measure the resonant voltage on the test object and serve as an overvoltage protection signal; the frequency-modulated power output is coupled to the series resonant circuit through the excitation transformer to provide the excitation power for the series resonance. Professionally developed and produced, it adopts a split design, greatly reducing labor.
Product Principle
We know that when the circuit frequency f=1/2π√LC, the circuit resonates. At this time, the voltage on the test object is Q times the output voltage of the high-voltage end of the excitation transformer. Q is the quality factor of the system, i.e., the voltage resonance multiple, generally ranging from tens to over a hundred. First, adjust the output frequency of the variable frequency power supply to make the circuit resonate in series, then under the condition of circuit resonance, adjust the output voltage of the variable frequency power supply to make the voltage on the test object reach the test value. Due to the resonance of the circuit, a relatively small output voltage of the variable frequency power supply can produce a high test voltage on the test object CX.
Main Technical Parameters of the Equipment
*Working power supply: 220V/380V, 50HZ *Test capacity: 30-30000KVA
*Test voltage: 1000KV and below *Resonant frequency range: 20-300Hz
*Test voltage waveform: sine wave, waveform distortion rate less than or equal to 0.3%
*Test voltage accuracy: level 1
*Frequency adjustment: 0.01Hz *Protection response time: less than 1 microsecond
*The system has overvoltage protection, overcurrent protection, discharge protection, breakdown trip protection, and overheating protection.
Note: The above information and technical parameters are compiled and released by Yangzhou Dary Electric Co., Ltd.
