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Electric Power Voltage Sag Solutions: Coil-Hold-in-Devices (Coil-Locks)

Electric Power Voltage Sag Solutions: Coil-Hold-in-Devices (Coil-Locks). Presented by: Power Quality Solutions, Inc. (PQSI) Knoxville, Tennessee USA. February 2009. Symptoms of Electric Power Quality Problems. Power Quality problems are … … failure or misoperation

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Electric Power Voltage Sag Solutions: Coil-Hold-in-Devices (Coil-Locks)

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  1. Electric Power Voltage Sag Solutions:Coil-Hold-in-Devices (Coil-Locks) Presented by: Power Quality Solutions, Inc. (PQSI) Knoxville, Tennessee USA February 2009

  2. Symptoms of Electric Power Quality Problems Power Quality problems are … … failure or misoperation … of customer end-use equipment … caused by voltage, current or frequency deviations

  3. The Voltage Sag Solution: PQSI Coil-Locks A cost-effective, low intrusive way to protect your vital equipment from voltage sags and dips.

  4. Energy User Surveys* Typical Number of Facility Voltage Incidents/Year Your Text Most devices will operate here Devices protected by a Coil-Lockswill operate here *Electric Power Research Institute (EPRI), Canadian Electric Associations (CEA), and National Power Laboratory (NPL)

  5. Typical Number Facility Voltage Sag Events* The PQSI Coil-Lock is not time based, therefore it maintains operation during sag events. *Electric Power Research Institute (EPRI), Canadian Electric Associations (CEA), and National Power Laboratory (NPL)

  6. Typical Voltage Sags in RMS Terms Your Text Power Quality Variation Category Example of a Voltage Sag RMS Variation Voltage Sags (RMS Disturbance) Your Text Method of Characterization Your Text • Magnitude & Duration Your Text Typical Causes Your Text • Utility System Faults • Motors Starting • Load Variations • Weather Conditions

  7. Duration (4 Cycles) 1 0.5 – 0 -0.5 – -1 – 8 0 1 2 4 5 6 7 3 Magnitude (50% of Nominal) Typical Voltage Sag Events* in Real-Time Terms * Voltage sag 50% depth with duration that can vary from 8 milliseconds to > 3 seconds due to across the line motors starting in industrial processes, air conditioners, and utility activities.

  8. Process Solenoid Relay & Contactor OperatedDevices that can “trip” with 25% Voltage Sag Events

  9. PQSI Coil-Lock Coil-hold-in-DeviceProtects for 75% Deep Sags(i.e. 25% Remaining Voltage)

  10. PQSI Coil-Lock Coil-hold-in-DeviceProvides SEMI F47 Voltage Sag Immunity Duration of Voltage Sag in Seconds 0.1 100 0.02 1 10 0.01 100 90 80 70 60 50 40 30 20 10 0 Equipment required to Operate in this region Percent of Equipment Nominal Voltage * See Note 1 for Explanation of this Pass/fail point Legend Pass Fail, but not required to pass Fail Equipment not required to Operate in this region * Area included in Specification 0.05 to 1 Second Voltage Sag Immunity – SEMI F47 SEMI Stepper/Washer, 240V 50 Hz power Model 2200, SN 99SW4502, 5/00 Note 1: This point (50% sag for 12 cycles) initially failed for L3-L1 sags with a “High Velocity Pressure Sprayer” fault, but passed for L1-L2 and L2-L3 sags.

  11. 2 3 PQSI Coil-Lock Applications 1 Coil-Locks Eliminate Weak Links … Relays, contactors, and motor starters are used extensively in commercial and industrial facilities to control business machines and process equipment. These devices often have a low tolerance to electric service voltage sags, and are frequently diagnosed as “weak links” in automated production lines. Coil-Locks Eliminate Costly Equipment Shutdown … During common voltage sags, the solenoid coils in these motor-driven systems may de-energize long enough to cause the power circuit mechanical contacts to open (chatter), and the connected electrical equipment to shutdown. The Coil-Lock eliminates costly process shutdown, installs in minutes, and can be a cost-effective alternative to other voltage sag protection methods. Coil-Locks Eliminate Disruption of Operations … This situation can impact an entire manufacturing facility The Coil-Lock is available in different models to be compatible with most solenoid operated relays and contactors, and is ideal for protecting master control relays, and E-stop circuits. .

  12. Good Place to Begin “Hardening”:Emergency Off (EMO) Circuit (Simplified)

  13. PQSI Coil-Lock: Simple Installation

  14. Coil-Lock Coil-Lock Coil-Lock Coil-Lock PQSI Coil-Lock: Field Installations NEMA Size 1 NEMA Size 3 NEMA Size 5 SEMI F47 Equipment

  15. PQSI Coil-Lock: 120Vac & 240Vac Models Coil-Lock 120Vac Models Coil-Lock 240Vac Models

  16. PQSI Coil-Lock: Selective Power Conditioning

  17. Summary Power line variation impacts such as Voltage sags can be minimized with PQSI Coil-Locks. Strategy Challenges Forward History

  18. Thank You! Special Thanks to: EPRI, CEA, and NPL Corporations for use of their ongoing Power Quality System Compatibility Research Prepared by Power Quality Solutions, Inc. Knoxville, TN USA

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