Method for testing impedance characteristic of large electrical equipment based on frequency-sweep method
A technology of power equipment and testing methods, which is applied in the direction of measuring resistance/reactance/impedance, measuring devices, and measuring electrical variables, etc., and can solve the problems that equipment ports cannot be connected to impedance measuring instruments, large-scale power equipment is bulky, and lack of testing equipment measurement methods, etc. problems, to achieve the effect of improving the measurement frequency range and signal strength, less interference and high precision
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[0017] The method for testing the impedance of large-scale power equipment based on the frequency sweep method proposed by the present invention, its principle diagram is as follows figure 1 shown, including the following steps:
[0018] (1) Make the measured large-scale electric equipment 2, connecting cables 1 and 3, measuring accessories 4, impedance measuring instrument 5 and computer 6 be placed in order according to the measurement position;
[0019] (2) Short-circuit and open-circuit the terminals of the connecting cable 1 respectively, and measure the short-circuit impedance Zcs and open-circuit admittance Yco of the connecting cable 1 with the impedance measuring instrument 5 at the head end of the connecting cable 1, according to the short-circuit impedance Zcs and open-circuit admittance Yco, calculate the cable attenuation constant γ and the cable natural impedance Zc:
[0020] (3) Connect the high-voltage end and low-voltage end of the large-scale power equip...
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