Transcript Controlled Power Co. Welcomes MGE

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
• 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
• Standby (Off-Line)
• Line-Interactive
• On-Line Single Conversion (Ferro
resonant UPS)
• 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
MD 5000 Regulation
EDGE
REGULATION
260
255
250
Output Voltage (240)
*
-38%
245
*
-58%
0% load
*
-32%
25% load
50% load
240
*
-25%
75% load
100% load
235
* Battery
Operation
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