Authors S.A. Kirakosyan, V.G. Galalu
Month, Year 05, 2016 @en
Index UDC 621.391.823
Abstract Research objective: an experimental assessment of noise level on ground buses at several enterprises. A development of recommendations for sensors and the precisions amplifiers installation in systems of industrial automation. The main power network inclusion schemes at the industrial enterprises have been considered. It has been shown that the best is the TN-S system which, unfortunately, is difficult for implementing at the enterprises. The worst case of breeding a power busses are the TN-C and TN-C-S systems which meet in 90 % of cases. According to requirements of industrial safety standards all equipment should be surely connected to the ground bus that leads to formation a lot of points and ground loops. The use of the thyristor converters, the AC/DC, DC/DC converters, the frequency electric drives, contact weldes, etc. leads to emergence of a large number of impulse noises on the ground bus. A basic reason of high-frequency noise emergence is switching processes in the listed devices. The experimental check has shown that even on 10 meter ground bus constant voltage to 100 mV, an alternating voltage 50 Hz (400 Hz) – to 200 mV and a large number of powerful impulse noises with up to several volts amplitude can be observed. The greatest number of impulse noises is observed in the morning when equipment turns on. The law of impulse noises distribution is close to logarithmic normal (p=0,95), separate impulse noises with amplitude exceeding 10 σ (p=0,01) are often observed. The biggest amplitudes are observed at coincidence of noises from several sources at the same time. Noises on the ground bus are synphased noises for data processing units. The experimental check of suppression cophased noises coefficient on the ground bus by means of the adjusted tool amplifier AMP02E has shown that short impulse noises are suppressed very badly, by only 5–10 times. It leads to failures of ADC and significantly reduces the measurement accuracy of physical quantities.

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Keywords Ground bus; synphased interference; impulse noise; high accuracy instrumentation amplifier
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