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Power frequency voltage tester product features:
1. Due to full compensation of resonance and reactive power, the power of the power supply and equipment is only 1/10 of the required capacity of the tested product; the volume of the same capacity is small, the weight is light, the output capacity of the device is large, and the required power supply capacity is small. Cheap, easy to use and safe to use.
2. The generator AC withstand voltage test device is actually a current filter circuit, so that the current through the test object is basically the fundamental current, the output voltage waveform distortion rate (THD) is extremely small, superior to all existing types of AC withstand voltage equipment.
3. The short-circuit current after flashover or breakdown of the test sample is only 1/10 or less of the test current before the short-circuit, which can effectively prevent damage to the fault point after breakdown.
4. After the flashover, the arc extinguishes immediately. After the arc extinguishes, the process of restoring the resonant voltage is established. It is a steady-state setup process. There is no concern about voltage overshoot and no micro second-level millisecond transient recovery. The danger of voltage.
The frequency withstand voltage tester adopts the method of adjusting the frequency of the power supply, so that the reactor and the capacitor to be tested resonate, and obtaining a high voltage and a large current on the test object is a new method and trend of the current high voltage test. It has been widely used at home and abroad.
The frequency withstand voltage tester adopts a dedicated SPWM digital waveform generator chip with 16-bit frequency resolution and a frequency fineness of 0.1 Hz at 20-300 Hz. The use of orthogonal non-synchronized fixed carrier modulation ensures that The output waveform is good throughout the frequency range; advanced IPM modules are used in the power section to ensure the stability and safety of the instrument at minimum weight.
The frequency withstand voltage tester consists of a frequency modulated voltage regulator power supply, an excitation transformer, a reactor, and a capacitive voltage divider. At present, there are two major types of test devices used in the field, namely the imported square wave modulation type and the standard sine wave FM frequency modulation and resonance type. The two resonant test devices use the principle of loop resonance to meet the voltage and current requirements for the test.
When the cross-linked cable is used for AC voltage withstand test, if the test voltage of the cable is relatively high, but the length of the short sample is not large, the current of the sample is small, and the test only needs to consider the output voltage requirement of the test power supply device. The series resonance is used for testing. When the length of the cable to be tested is long, the capacitance of the sample is large, the current of the sample is large, and the single series resonant mode cannot meet the test requirements, so the “series-parallel resonant method†is proposed, ie, the serial resonance added in parallel is added. In this way, using a portable, small-capacity resonant test device, AC withstand voltage tests were successfully performed on several kilometers of cross-linked cables.
Obviously, when the cable length increases and the test current required for the test increases, only a further increase in the number of reactors can always meet the test requirements. Practical and theoretical analysis shows that the number of reactors that can be compensated in parallel in the test loop cannot be increased indefinitely.