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Charlotte Stonestreet
Managing Editor |
Editor's Pick
Current probes
07 April 2016
Motor installers and design engineers can deal more effectively with high frequency (hf) common-mode currents caused by variable-frequency drives, using the latest non-contact current probes from Power Electronic Measurements (PEM).
The new CMC series of current probes, using Rogowski technology, empower engineers to assess the magnitude of the threat posed by hf common-mode currents, that can damage motor bearings and interfere with nearby electrical equipment. The current measurements can help determine suitable corrective action, such as fitting brushes, insulated bearings, or choke coils, and with further measurements assess the effectiveness of the chosen remedy.
The screened coils have excellent immunity to voltage disturbances and a low frequency (-3dB) bandwidth that attenuates unwanted 50/60Hz magnetic fields while maximising the SNR of the measurement of the high frequency common mode currents.
