Power frequency parallel resonance withstand voltage test method based on incomplete compensation
A technology of withstand voltage test and parallel connection, which is applied in the direction of testing dielectric strength, measuring devices, instruments, etc., can solve the problems of increased insulation of excitation transformers, inconvenient manufacturing and on-site transportation, and low reliability, so as to save compensation capacitors , reduce volume and weight, and reduce difficulty
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Embodiment 1
[0029] Power frequency parallel resonance withstand voltage test method based on non-full compensation, including:
[0030] Step 1, establish a withstand voltage test model based on non-fully compensated power frequency parallel resonance; figure 1 As shown, the withstand voltage test model includes a power frequency test power supply, a power frequency step-up transformer, a compensating reactor and the tested product. The power frequency test power supply is connected to the low voltage end of the power frequency step-up transformer, and the tested product is connected The compensation reactor is connected to the high voltage end of the power frequency step-up transformer.
[0031] Step 2, compare the capacitive current value I flowing on the tested product in the withstand voltage test model C And the rated output current value I of the high voltage end of the power frequency step-up transformer in the withstand voltage test model 2 ; if I C greater than I 2 , when cal...
Embodiment 2
[0038] In order to verify the practicability and effectiveness of the power frequency parallel resonance withstand voltage test method based on non-full compensation, a corresponding circuit model is established in this paper. The specific circuit parameters are as follows: tested product (30kV, capacitance 0.0222μF), power frequency step-up transformer (50kV, 0.01A, transformation ratio 250:1, high-voltage side coil resistance 23kΩ, weight 25kg), reactor (40kV per section , 1.5A, inductance 76H, resistance 400Ω, weight 38kg) a total of five sections, requiring 21.75kV, 5min AC withstand voltage test on the tested product.
[0039] The first step is to calculate the capacitive current value flowing through the tested product at power frequency AC withstand voltage:
[0040] I C =ωC x U=2×π×50×0.0222×10 -6 ×21.75×10 3 = 0.1517A is far greater than the rated output current 0.01A of the high voltage side of the power frequency step-up transformer, so a parallel compensating r...
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