Post on 04-Jun-2018
transcript
8/13/2019 Power Quality Issue
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Typical power quality issues vary dependingon customer type
Residential Commercial Industrial
Typical power quality issues vary dependingon customer type
Residential Commercial Industrial
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Tools For Diagnosis
Communication with customer
Communication with Line/serviceman Recording Voltmeter Power Quality Monitor
TVI Monitor
Tools For Diagnosis
Communication with customer
Communication with Line/serviceman Recording Voltmeter Power Quality Monitor
TVI Monitor
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ResidentialResidential
Complaints stem from:
Excessive Flicker
Blinking Lights (Recloser Operations) TV interference
Complaints stem from:
Excessive Flicker
Blinking Lights (Recloser Operations) TV interference
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ResidentialResidential
Causes of flicker
Motor Startup (A\C, well pumps, etc.)
Faults on adjacent taps or circuits Loose Neutral
Causes of flicker
Motor Startup (A\C, well pumps, etc.)
Faults on adjacent taps or circuits Loose Neutral
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ResidentialResidential
Blinking Lights
Try to educate your customers (blinking is
better than an outage) Tree trimming and Recloser Fast Curves
Blinking Lights
Try to educate your customers (blinking is
better than an outage) Tree trimming and Recloser Fast Curves
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ResidentialResidential
TV Interference
HAMM Radio
AM Radio Reception High Frequency Carrier Signals
TV Interference
HAMM Radio
AM Radio Reception High Frequency Carrier Signals
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CommercialCommercial
Complaints Stem From:
Undersized Service
Harmonics, Transients Motor Protection Schemes Others.
Complaints Stem From:
Undersized Service
Harmonics, Transients Motor Protection Schemes Others.
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CommercialCommercial
Undersized Service
Bad information from customer
Unannounced load growth
Undersized Service
Bad information from customer
Unannounced load growth
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CommercialCommercial
Harmonics, Transients
Affects sophisticated machinery (CNC,Variable Frequency Drives, etc)
Harmonics, Transients
Affects sophisticated machinery (CNC,Variable Frequency Drives, etc)
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CommercialCommercial
Motor Protection Schemes
Settings not adjustable
Warranty requirements
Motor Protection Schemes
Settings not adjustable
Warranty requirements
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IndustrialIndustrial
Similar to commercial, but:
Effects are increased in scale
Larger facility introduces more possibilities
Similar to commercial, but:
Effects are increased in scale
Larger facility introduces more possibilities
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Industrial: Northstar EthanolIndustrial: Northstar Ethanol
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Industrial: Northstar EthanolIndustrial: Northstar Ethanol
Plant built in two phases
Phase 1 began operation in mid 2005 Phase 2 will be built in the future
Consumes 17.5 million bushels of corn annually Produces 50 million gallons of ethanol annually
Employs approximately 40 people
Plant built in two phases
Phase 1 began operation in mid 2005 Phase 2 will be built in the future
Consumes 17.5 million bushels of corn annually Produces 50 million gallons of ethanol annually
Employs approximately 40 people
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Industrial: Northstar EthanolIndustrial: Northstar Ethanol
The plant has Variable Frequency Drives (VFDs)
that control processes and operations in sevenparts of the plant.
These VFDs are controlled by a 600 VDC
source. To protect the units, they are designed to trip
offline for voltages over 800 VDC
The plant has Variable Frequency Drives (VFDs)
that control processes and operations in sevenparts of the plant.
These VFDs are controlled by a 600 VDC
source. To protect the units, they are designed to trip
offline for voltages over 800 VDC
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Industrial: Northstar EthanolIndustrial: Northstar Ethanol
The substation that serves Northstar is located