EDGE Rough Duty UPS ROUGH DUTY UPS

Power Quality Problems on Rigs

• • •

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

Diesel Generators are subjected to a constant step load change every time the top drive motor starts or stops (which is frequent) 3 Phase, six pulse SCR motor controllers produce power for the top drive motor.

Voltage Fluctuations from Generators

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

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

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

Voltage Fluctuations From Generator

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 Faults

• Generator Frequency Variations • Generator Voltage Harmonic Distortion

Top Drive SCR Notching

Using a Commodity UPS in a harsh electrical environment

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If the UPS cannot correct for the voltage, wave shape or track frequency, it switches to batteries to protect the load.

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

Battery life is limited due to extended use.

UPS Topologies

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Standby (Off-Line) Line-Interactive On-Line Single Conversion (Ferro resonant UPS)

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On-Line Double Conversion Hybrid

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

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

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

• Wave Shape Faults and Transients-These faults will cause continuous switching to batteries to protect the loads. The result is depleted batteries and loss of protection when critically required.

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

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

Federal Signals Solution

Major Power Problems: Voltage Fluctuations Wave Shape Faults Frequency Changes EDGE Has Extended Input Range Active Input Filtering Extended Frequency Range

260 255 250 245 * -58% 240 * -38% * -32% * -25% 235 0% load 25% load 50% load 75% load 100% load 230 * -15% 225 220 100 110 120 130 140 150 160 170 180 190 200

Input Voltage (208)

210 220 230 +10% 240 250 +20% 260 270 +30% 280 * Battery Operation