Effect of voltage dips on frequency relays: Case study of Power Quality improvements in a petrochemical plant

Industrial process interruption is one of the major power quality issues. Load-shedding schemes based on sub-frequency monitoring are normally employed to disconnect loads so that the balance between the system generation and loading is restored. This procedure should be very reliable and well adjus...

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Bibliographic Details
Main Authors: Bronzeado, H.S., Zimath, S.L., Coser, J.
Format: Conference Proceeding
Language:English
Subjects:
Chemical industry
Frequency
Frequency Measurement
Frequency Protection
Industrial Process Interruption
Load Shedding Scheme
Monitoring
Petrochemicals
Power quality
Power system relaying
Power system reliability
Power system restoration
Relays
Voltage Dip
Voltage fluctuations
Voltage Phase Jump
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Summary:Industrial process interruption is one of the major power quality issues. Load-shedding schemes based on sub-frequency monitoring are normally employed to disconnect loads so that the balance between the system generation and loading is restored. This procedure should be very reliable and well adjusted. In this paper, a case study is presented, wherein an industrial process of a petrochemical plant was tripped out by frequency relays that were not suppose to operate as the system disturbances were not associated to the imbalance between load and generation, but to a voltage dip in the supply transmission system. This case study is based on actual recorded data, showing evidences that voltage dips may affect the frequency measurements, leading to load interruptions that should be avoided. Recommendations to prevent this sort of false trip are discussed.
ISSN:1540-6008
2164-0610
DOI:10.1109/ICHQP.2008.4668858