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, lack of testing equipment measurement methods, and large-scale electrical equipment is bulky, 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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