Quantcast Breaker/Relay Settings

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LANTNAVFACENGCOM A&E GUIDE
3/93
A.1.13
BREAKER/RELAY SETTINGS
a. The designer shall discuss proposed relay protection schemes,
including selection of relays and current transformer ratios, with
LANTNAVACENGCOM Code 163 during the design process.
b. The designer shall ensure that construction contract documents require
that the contractor submit manufacturer's published time-current
curves (on full size logarithmic paper) of primary fuses, relays, main
secondary breakers, and secondary feeder protective devices.
c. Upon completion of successful shop drawing review, the designer shall
properly select high side transformer fuses and provide settings for
main secondary breakers and secondary feeder protective devices. The
designer shall ensure that circuit components are adequately protected
against short circuits and ground faults and that protective devices are
properly coordinated. LANTNAVFACENGCOM Code 163 will be
available to assist the designer if required.
d. LANTNAVFACENGCOM Code 163 shall be directly responsible for
providing settings for protective relays and for selecting proper primary
fuses (except that high side transformer fuses shall be selected by the
designer). Required information will be forwarded to
LANTNAVFACENGCOM Code 163 by the designer upon completion
of successful shop drawing review.
e. Fuse selections and breaker/relay settings shall be promptly
determined and immediately forwarded to LANTNAVFACENGCOM
Code 05.
f. Please note that protective relays associated with Air Force and Army
bases are not the responsibility of LANTNAVFACENGCOM Code
163; the designer must obtain settings for these relays from the
appropriate command.
A.1.14
NON-LINEAR LOADS
Many types of data processing and office equipment, such as computers,
copiers, video display terminals, printers, and plotters, use switch-mode power
supplies (SMPS). While this technology provides significant reduction in
equipment losses, weight, volume, and cost, it also can cause problems in the
building electrical distribution system SMPS draw power from the source in
pulses during the peak of each voltage half-cycle, rather than continuously,
resulting in severe nonlinearity and high harmonic currents.
Attachment A-9





 


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