Widespread use of electronic equipment(for e.g. VSD, PLC, automation & data processors, inverters,computerized numerical control, etc.) in today’s industrial environment, various PQ problems like voltage dips, short / long interruptions, harmonics, transients & surges and other PQ related problems are frequently encountered. Such interruptions cause huge financial losses both – to the utility and to the end-consumer.
Some of the key physical manifestations of the PQ issues are mentioned below:
Equipment affected due to poor PQ
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External Manifestation of poor PQ
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Electrical PQ problem
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Relays, contactors and circuit breakers
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Nuisance tripping of protective devices
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Distorted voltage waveform because of voltage dip
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Telecommunication system
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Noise interference to telecommunication lines
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Electrical noise causing
interference signals |
Variable speed drives, welding equipment, security, converters, access control systems, etc.
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Motors or process equipment are damaged / Overheating of motors
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Capacitor bank failure, shocks due to neutral voltage, Flickering of lights, noise in telecom lines
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Motors and process devices
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Motors or other process equipment fails or malfunctions
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Presence of voltage and current harmonics in the power supply
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Sensitive measurements of process control equipment
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Loss of synchronization of processing equipment
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Severe harmonic distortion creating additional zero-crossings within a cycle of the sine wave
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Data Processing / IT equipment (that are sensitive to change in voltage signal)
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Computer Screen Freeze, lock-ups / Loss of Data
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Voltage Variation
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