10kv/35kv AC Withstand Voltage Test Device
It utilizes the principle of series resonance, using an excitation transformer to excite the series resonance circuit. By adjusting the output frequency of the frequency converter controller, the reactor inductance L in the circuit and the test object capacitance C undergo series resonance, and the resonance voltage is the voltage applied to the test object.The variable frequency resonance test device is widely used in industries such as power, metallurgy, petroleum, and chemical, and is suitable for handover and preventive tests of large-capacity, high-voltage capacitive test objects.
Technical Indicators:
(1) Operating temperature range: -10~45℃
(2) Operating humidity range: ≤90%
(3) Altitude: ≤1000m
(4) Power supply voltage: 380V±10%, three-phase or 220V±10%, single-phase (10KW and below)
50/60Hz
(5) Power supply capacity: 0-300KW
(6) Rated output voltage: 0-1000KV
(7) Rated output capacity: 0-35MVA
(8) Operating frequency range: 30-300Hz (can also be widened according to user requirements)
(9) Frequency adjustment resolution: 0.02Hz; Instability ≤0.05%
(10) Noise: ≤60dB
(11) System measurement accuracy: Level 1
(12) Output waveform: sine wave, waveform distortion rate ≤1%
(13) Reactor Q value: 30-120
(14) The system has fully automatic protection for IGBT, overvoltage, overcurrent, and test object flashover
Main Features:
1. Small size, light weight, suitable for field use
It integrates voltage regulation, frequency conversion, control, and protection functions, eliminating the need for bulky voltage regulators, and is easy to operate with intuitive readings. Due to the high Q value of the system (30-120), it effectively solves the constraints of insufficient power supply capacity on field tests. When the voltage level is high, the reactor adopts a multi-stage or stacked structure, which is convenient for transportation and on-site installation.
2. High installation reliability
Advanced design concepts, high-quality IGBTs, and drive circuits result in low output waveform distortion, good frequency output stability, and excellent protection functions for IGBT, overcurrent, overvoltage (protection values can be manually set as needed), and discharge protection, ensuring the safety of equipment and personnel. When the test object discharges or breaks down, due to the destruction of resonance conditions, the short-circuit current is small, only 1/Q of the test object's test current, avoiding damage to the test object caused by breakdown.
3. Good test equivalence
Using AC voltage close to power frequency (30HZ-300HZ) as the test power supply, it is very close to the 50HZ/60Hz power frequency in both equivalence and *ness, ensuring the reliability and authenticity of test results.
Precautions:
1. Before powering on the entire unit, always carefully check whether all input and output connections are correct and secure, and whether the grounding is reliable. The grounding wire adopts single-point grounding, led out from the panel (it is best to use bare copper wire for the grounding wire).
2. During the test, the reactor should not be placed on conductive materials such as iron plates or copper plates.
3. Before boosting the voltage during the test, the overvoltage protection value needs to be set to prevent accidental tripping during the test.
4. When the frequency converter controller indicates overvoltage protection, overcurrent protection, or discharge protection, please exit the test, re-set the voltage and current protection values, and then enter the test again.
