8/13/2019 Power Quality Issue

1/24

8/13/2019 Power Quality Issue

2/24

2A

Typical power quality issues vary dependingon customer type

Residential Commercial Industrial

Typical power quality issues vary dependingon customer type

Residential Commercial Industrial

8/13/2019 Power Quality Issue

3/24

3A

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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4A

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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5A

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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6A

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

8/13/2019 Power Quality Issue

7/24

7A

ResidentialResidential

TV Interference

HAMM Radio

AM Radio Reception High Frequency Carrier Signals

TV Interference

HAMM Radio

AM Radio Reception High Frequency Carrier Signals

8/13/2019 Power Quality Issue

8/24

8A

CommercialCommercial

Complaints Stem From:

Undersized Service

Harmonics, Transients Motor Protection Schemes Others.

Complaints Stem From:

Undersized Service

Harmonics, Transients Motor Protection Schemes Others.

8/13/2019 Power Quality Issue

9/24

9A

CommercialCommercial

Undersized Service

Bad information from customer

Unannounced load growth

Undersized Service

Bad information from customer

Unannounced load growth

8/13/2019 Power Quality Issue

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10A

CommercialCommercial

Harmonics, Transients

Affects sophisticated machinery (CNC,Variable Frequency Drives, etc)

Harmonics, Transients

Affects sophisticated machinery (CNC,Variable Frequency Drives, etc)

8/13/2019 Power Quality Issue

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11A

CommercialCommercial

Motor Protection Schemes

Settings not adjustable

Warranty requirements

Motor Protection Schemes

Settings not adjustable

Warranty requirements

8/13/2019 Power Quality Issue

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12A

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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13A

Industrial: Northstar EthanolIndustrial: Northstar Ethanol

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14A

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

8/13/2019 Power Quality Issue

15/24

15A

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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16A

Industrial: Northstar EthanolIndustrial: Northstar Ethanol

The substation that serves Northstar is located