TranSystems Corporation - LGM Construction

501070099 Federal Express Oakland Sort Expansion Issued for Bid 10/11
2.2 CAPACITORS, GENERAL
A. Construction: Multiple capacitor cells or elements, factory wired in three-phase groups and mounted in
metal enclosures.
B. Capacitor Cells: Dry, metallized-dielectric, self-healing type. Each cell shall be encapsulated in
thermosetting resin inside plastic container.
C. Cell Rupture Protection: Pressure-sensitive circuit interrupter for each cell.
D. Capacitor-Bank Fuses: Current-limiting, noninterchangeable type; factory installed in each phase and
located within the equipment enclosure unless otherwise indicated. Features include the following:
1. Interrupting Capacity: 200,000 A, minimum.
2. Fuse Ratings and Characteristics: As recommended by capacitor manufacturer.
3. Neon Indicator Lamp for Each Fuse: Connect to illuminate when fuse has opened, but is still in
place, and locate so it is visible from outside the enclosure.
E. Discharge Resistors: Factory installed and wired.
F. Enclosure: Arranged to contain the fluid leakage from capacitor cells; factory equipped with mounting
brackets suitable for type of mounting indicated.
2.3 FIXED CAPACITORS
A. Description: Integrally fused, unless otherwise indicated.
B. Internal Wiring: Factory wired, ready for field connection to external circuits at a single set of pressure
terminals.
2.4 EQUIPMENT SIZE/RATINGS
A. Operating voltage shall be 480 volts (line-to-line), three phase, 60 hertz.
B. Rated capacitor cell voltage shall be minimum of 570 volts for 480 volts network.
2.5 AUTOMATIC POWER FACTOR CORRECTION UNITS
A. Comply with NEMA ICS 2 “Controllers, Contactors and Overload Relays Rated 600V”
B. Description: Capacitor banks, contactors, controls, and accessories factory installed in independent
enclosures. Units include a separately mounted current transformer to sense current in the power circuit
being corrected and to provide input to unit controls.
C. Performance Requirements: Controls permit selection of a target power factor, adjustable to any value
between unity and 0.80 lagging. Controls continuously sense the power factor on circuits being corrected
and, when the power factor differs from the target setting for more than 10 seconds, operate a contractor
to switch a capacitor bank into or out of the circuit. Contactors are opened or closed as required to bring
the corrected circuit power factor closer to the target setting. Switch only one capacitor bank at a time.
POWER FACTOR CORRECTION CAPACITOR SYSTEMS 16450 - 3