10kv/35kv AC Withstand Voltage Test Device
It uses the principle of series resonance, excites the series resonance circuit with an excitation transformer, and adjusts the output frequency of the variable frequency controller so that the reactor inductance L and the test object capacitance C in the circuit resonate in series, and the resonance voltage is the voltage applied to the test object.The variable frequency resonance test device is widely used in electric power, metallurgy, petroleum, chemical and other industries, and is suitable for handover and preventive tests of large-capacity, high-voltage capacitive test objects.
Technical indicators:
(1) Working temperature range: -10~45℃
(2) Working 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) Working frequency range: 30-300Hz (the frequency range 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 full automatic protection such as IGBT, overvoltage, overcurrent, and test object flashover
Main features:
1. Small size, light weight, suitable for on-site 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 on-site 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 IGBT and drive circuits make the output waveform distortion small, frequency output stability good, and have good IGBT, overcurrent, overvoltage (protection value can be manually set as needed) and discharge protection functions, which can protect 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 current of the test object, 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 power supply in both equivalence and *ness, ensuring the reliability and authenticity of test results.
Precautions:
1. Before powering on the whole machine, be sure to carefully check whether all input and output wiring is correct and firm, 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 variable frequency controller prompts 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.
