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Experience

with Custom

PowerApplications

for Critical

Manufacturing

Facilities

September 2003

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Medium Voltage UPS Systems

Systems commonly at 5, 1525 & 34.5 kV

Ratings up to 20,000 kVA / 16,000 kW

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PureWave Medium Voltage UPS

Configurations For 5,000 kVA and Larger

PES Available Ratings: 600 and 1200 ampsPES Available Ratings: 600 and 1200 amps

Available Voltages: 4.16, 6.6, 11.0, 13.8 and 22 kVAvailable Voltages: 4.16, 6.6, 11.0, 13.8 and 22 kV

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Building Block - 250 kW Power Module

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Merck Pharmaceutical Puerto RicoTypical Medium Voltage System Layout

4,000 kVA @ 4160V

Rating: 5000 kVA/ 4000 kW at 12.47 kV

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Power Electronic Switch

Modules stackedin series

Three modules per

pole for 15 kV

Three poles per

switchN+1 design for

reliability

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Medium Voltage System Power Electronic

Switch

Rating: 600 amps @ 5 or 15 kV

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Medium Voltage Source Transfer System

(STS)

Mechanical andElectro-Mechanical systems

Less than 3 seconds

Less than 2 cycles

Solid State Electronic systems 2-4 milliseconds (1/4 cycle)

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Electronic Source Transfer System

Seamlessly transfers in 1/4 cycle

Maintains load within CBEMA/ITIC

curve

Protects entire load from distribution

system disturbances

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Semiconductor FabAlbuquerque, NM

Rating: 2 x 10,000 kVA UPS @12.47 kV

With Source Transfer and Generators

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Semiconductor FabAlbuquerque, NM

Rating: 2 x 10,000 kVA UPS @12.47 kV

With Source Transfer and Generators

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Dynamic Voltage Restorer

(Sag Correction System)

Dynamic Voltage Restorers (DVRs) are being applied up

to protect loads up to 100 MVA

Capacitor energy storage provide voltage boost up to 50%

for up to 1 second on all three phases.

Most economical solution for voltage sags and swells forlarge loads

Ideal when only one source is available or with twosources when sags/swells are transmission related

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DVR Performance

Transmission

System Switching

or Fault Clearing

Fault occuring on

adjacent feed

Primary FeedersDistribution

Substation

DYNAMIC

VOLTAGE

RESTORER

RestoredVoltage

PU

+1

0

-1

=+

PU

+1

0

-1

Line VoltageWith Sag

CompensatingVoltage

PU

+1

0

-1

Protected

Sensitive Load

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Dynamic Voltage Restorer (DVR)

Semiconductor Fab Chandler, AZ

Worlds largest DVRinstallation

Two sets of twin 5- or 6-MVADVR systems

Substation dedicated to twomajor semiconductor fab

plants

12.5-kV substation fed bythree 69-kV overhead lines;five 50-MVA transformers

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Typical DVR Performance

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Dynamic Voltage Restorer (DVR)

Large Paper Mill Critical Load Bus ProtectionLarge Paper Mill Critical Load Bus Protection

UPM

Continuous process coated

paper production

47MVA total plant load;

8.3MVA critical

23 synchronized motor drives

Largest 1300 hp

DVR provides critical loadbus protection for orderly

shutdown to avoid costly web

damage.

Low Voltage PureWave UPS System

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Low Voltage PureWave UPS System

Single Line Diagram w/ Generator

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Precision ManufacturerNewark, NJ

2,500 kVA UPS @ 480Vwith backup generator

di l li i

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Medical ClinicSoutheastern US

313 kVA UPS @ 480V