Abstract
The results of development, manufacturing and testing of a special contactless maintenance-free excitation current measurement system intended for the windings with high inductance, typical for superconductive alternators, are presented. The system was assembled on the brushless exciter is intended for 1 MVA wind-power generator with the winding, manufactured of high-temperature superconductors (HTSC). The alternator with brushless exciter were manufactured and successfully tested.
Highlights
One of the specific features of alternators with superconducting excitation windings is high inductance of the windings
The main aim of the work is the development of contactless maintenance-free system of excitation current measurements
The wind power alternator operates with a brushless exciter
Summary
One of the specific features of alternators with superconducting excitation windings is high inductance of the windings. The control of the excitation current value is important because of possible quench of the winding with transition from a superconductive to normal state It results in appearance of high electric resistance and high voltage on the excitation winding terminals. It was decided to make a brushless exciter operating with conventional air-cooling It contains the main exciter and sub-exciter and is independent of external current supply [2]. The main aim of the work is the development of contactless maintenance-free system of excitation current measurements It is to be responsible for the following: possibility of measurements in the current operating range; independence of the accuracy of measurements from the rotor frequency of rotation; insensitivity to external thermal, electromagnetic or mechanical influences; repeatability in case of serial production with application of a maximum possible amount of standard elements
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