EDGEEDGE

ROUGH DUTY UPSROUGH DUTY UPS

Rough Duty UPSRough Duty UPS

Power Quality Problems Power Quality Problems on Rigson Rigs

• Critical Federal Signal loads require clean, Critical Federal Signal loads require clean, regulated, uninterrupted power to operate.regulated, uninterrupted power to operate.

• Diesel Generators are subjected to a Diesel Generators are subjected to a constant step load change every time the constant step load change every time the top drive motor starts or stops (which is top drive motor starts or stops (which is frequent)frequent)

• 3 Phase, six pulse SCR motor controllers 3 Phase, six pulse SCR motor controllers produce power for the top drive motor.produce power for the top drive motor.

Voltage Fluctuations from Voltage Fluctuations from GeneratorsGenerators

• Voltage Sag created when top drive motor Voltage Sag created when top drive motor starts to move; loaded generators accelerate starts to move; loaded generators accelerate to supply power.to supply power.

• Voltage Surge created when the top drive Voltage Surge created when the top drive stops, the generator “overshoots” and the stops, the generator “overshoots” and the governor tries to slow the generator down.governor tries to slow the generator down.

• Step load changes on generators result in Step load changes on generators result in short term voltage sags and surges.short term voltage sags and surges.

Voltage Fluctuations From Voltage Fluctuations From GeneratorGenerator

Wave-Shape Faults

• Also, during these step load changes on the generators, the frequency (60Hz nominal) varies slightly as the generator speed changes.

• 6 Pulse SCR controllers on the top drive motor distort the waveshape from a perfect sine wave, and introduce severe notching and transients.

Wave-shape FaultsWave-shape Faults

• Generator Frequency Variations

• Generator Voltage Harmonic Distortion

Top Drive SCR Notching

Using a Commodity UPS in a Using a Commodity UPS in a harsh electrical environmentharsh electrical environment• If the UPS cannot correct for the voltage, If the UPS cannot correct for the voltage,

wave shape or track frequency, it switches wave shape or track frequency, it switches to batteries to protect the load.to batteries to protect the load.

• If the UPS is subjected to this electrical If the UPS is subjected to this electrical environment constantly, it runs on its environment constantly, it runs on its batteries until they are depleted and drops batteries until they are depleted and drops the load.the load.

• Battery life is limited due to extended use.Battery life is limited due to extended use.

UPS TopologiesUPS Topologies

• Standby (Off-Line)Standby (Off-Line)

• Line-InteractiveLine-Interactive

• On-Line Single Conversion (Ferro On-Line Single Conversion (Ferro resonant UPS)resonant UPS)

• On-Line Double ConversionOn-Line Double Conversion

• HybridHybrid

Why won’t a commodity UPS Why won’t a commodity UPS survive in this application?survive in this application?

• Testing has shown that the voltage Testing has shown that the voltage conditions on the rig exceed the standard conditions on the rig exceed the standard input window of a commodity UPS during a input window of a commodity UPS during a majority of their operating time. These majority of their operating time. These UPS topologies use their batteries to supply UPS topologies use their batteries to supply the load continuously and are not effective the load continuously and are not effective when power fails.when power fails.

Why won’t a commodity UPS Why won’t a commodity UPS survive in this application?survive in this application?• Wave Shape Faults and Transients-These Wave Shape Faults and Transients-These

faults will cause continuous switching to faults will cause continuous switching to batteries to protect the loads. The result is batteries to protect the loads. The result is depleted batteries and loss of protection depleted batteries and loss of protection when critically required.when critically required.

• Frequency Deviations-Frequency fluctuations Frequency Deviations-Frequency fluctuations outside of common specifications cause outside of common specifications cause continuous switching.continuous switching.

• Only a robust/hybrid topology UPS Only a robust/hybrid topology UPS should be used to protect critical loads should be used to protect critical loads in the electrical environment common in the electrical environment common on oil rigs. The EDGE will protect the on oil rigs. The EDGE will protect the load without abusive use of the load without abusive use of the batteries. Ideal for safety critical batteries. Ideal for safety critical systems where reliability is critical.systems where reliability is critical.

Federal Signals SolutionFederal Signals Solution

ED GE H asExtended Input R angeActive Input F iltering

Extended Frequency R ange

M ajor Power P roblem s:Voltage F luctuationsW ave Shape FaultsFrequency C hanges

MD 5000 Regulation

220

225

230

235

240

245

250

255

260

100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280

Input Voltage (208)

Ou

tpu

t V

olt

ag

e (

240) 0% load

25% load

50% load

75% load

100% load

* Battery Operation

*-15%

*-25%

+10% +20% +30%

*-32%

*-38%

*-58%

EDGE REGULATIONEDGE REGULATION