engleski

Vibrations measurement during hydrogenerator testing

This paper presents the results of vibration measurement during several specific tests of 35 MVA hydro-generator. The extended testing of hydro-generator (rated 35 MVA) was made because the generators working age expired and was going to be replaced with new one. This was the perfect opportunity to do some specific and not usual testing. The results of vibration measurements and comparison between two vibration measurement systems are presented in this paper. The measurement system was based on data acquisition unit (MUSYCS + PC) with 128 channels. Vibrations were recorded with two independent systems. The first measurement system was Bruel&Kjaer's vibration measurement system with three sensors (DELTA Tron) and amplifier (NEXUS). The second measurement system was custom made with accelerometers AUC40Ex and powered by standard voltage source. Output is voltage signal. The signals from both vibration measurement systems were connected to data acquisition unit based on IMCs MUSYCS and PC. The sample rate for every signal and measurement was 200 s and duration of data acquisition was 20 seconds. The generator tests, that took place, can roughly be divided into rest and de-energized, and one with generator rotation. For vibration measurement, rotation (movement) is essential so such tests will be described here. The presented data were recorded during following tests: sudden 3-pole short circuit, wrong synchronization (several types), asynchronous operation.

vibration measurement; generator; test

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