Power harmonic problems at a plastics extrusion plant
- Failure Analysis Associates, Inc., Framingham, MA (United States)
- Failure Analysis Associates, Inc., Cambridge, MA (United States)
A plastics extrusion plant in Massachusetts operated a 250-hp thyristor dc-adjustable speed drive from a 300-kVA 13.8 kV to 480 V utility service transformer on two miles of 13.8-kV line. The operation was marginal. Tripping of the drive occurred on undervoltage dips. To raise the power factor and reduce the voltage drop, the plant personnel installed 300 kvar of capacitors on the 480-V system. The installation was made without a power-harmonic study. The result was frequent tripping of the drives and noisy operation. It was apparent that a resonance occurred between the capacitors and the source impedance. To gain insight into the system operation, a PSpice computer simulation was performed on the plant electrical system. It was determined that the modified power system, with the capacitors installed, had a resonance frequency at the 5th harmonic. This resonance condition caused severe problems of harmonic voltage distortion, aggravated voltage drop, and caused the dc drives to trip. The PSpice computer simulation was also performed using power harmonic filters, consisting of tuning reactors in series with the capacitors.
- OSTI ID:
- 427973
- Report Number(s):
- CONF-9510203-; TRN: IM9708%%300
- Resource Relation:
- Conference: IEEE/Industrial Application Society conference, Orlando, FL (United States), 8-12 Oct 1995; Other Information: PBD: 1995; Related Information: Is Part Of Conference record of the 1995 IEEE Industry Applications Society 30. IAS annual meeting. Volume 3; PB: 961 p.
- Country of Publication:
- United States
- Language:
- English
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