TM5-811-1/AFJMAN
32-1080
proposed will be obtained in the criteria develop-
(4) Fuel adjustment charge. This charge is a
ment or early design stages of a project.
surcharge or a credit to the energy charge and is
f. Short-circuit capacity. The available short-
based upon the price paid by the utility for fuel for
circuit capacity of the electrical power sources
its generating stations.
(5) Facility charge. This is a fixed monthly
influences the design of circuit-controlling and
charge which is based upon the sophistication of
protective devices located in the station, and those
the utility's revenue metering equipment, owner-
provided in the distribution system. The serving
utility's future planned short-circuit current
ship (utility or user) of the main supply station(s),
and number of points metered.
should be considered in the design as well as the
b. Revenue metering. A utility provides a totaliz-
short-circuit current available at the time of de-
sign.
ing watthour meter equipped with a demand regis-
ter that is supplied by highly accurate instrument
g. Coordination study. A short-circuit study and
transformers. A demand type of varhour meter
a protective devices coordination study will be
will be provided by the utility when the rate
performed for each new or modified station or
schedule includes a power factor charge. Utility
substation. The studies will be performed at a date
meters cannot be used for any other purpose
early enough to ensure that proper equipment can
without prior approval by the utility. Revenue
be specified and proper protection provided. Refer
metering equipment will be provided by the Gov-
to IEEE Std 242 and TM 5-811-14 for guidance
ernment only when required by the utility, and
regarding coordinated power system protection. A
will comply with the utility requirements.
short-circuit and protective devices coordination
c. Energy conservation requirements. Reduction
study will be prepared to be used as a basis for
in energy usage is a national goal. Several pro-
equipment ratings and protective devices settings,
grams have been implemented to effect energy
and, for large projects, will include settings for 20,
reduction, including utility monitoring and control
40, 60, 80, and 100 percent load using typical
systems (UMCS). Provide for future UMCS moni-
devices.
toring by installing the following equipment dur-
ing substation construction: potential and current
4-5. Environmental Aspects.
transformers, watt and VAR transducers, circuit
The main electric supply station/substation should
breakers with auxiliary contacts, and watt-hour
be as environmentally pleasing as possible without
meters with pulse initiators for interface to UMCS
a significant increase in costs. The environmental
equipment. See TM 5-815-2 for additional infor-
impact will be evaluated for compliance with
mation.
current local and Federal regulations. Army regu-
d. Power factor correction. Provisions for future
lations are listed in AR 200-2.
installation of shunt capacitor equipment will not
be initially provided in the main electric supply
noise will be considered, particularly in developed
station. Power factor correction capacitors should
be provided at or near the terminals of inductive
areas or areas of planned development where noise
devices to minimize energy losses in the electrical
abatement will be mandatory. In warehouse and
supply systems.
industrial areas, noise impact will also be evalu-
e. Protection. The ratings and settings of over-
ated. Transformers with 115 kV primaries, that
current protective devices will be selected to afford
comply with ANSI and NEMA standards for noise
optimum protection of the electrical equipment
levels, will transmit only about 50 to 55 decibels
and systems. Utilities will have additional require-
to a point 100 feet from the transformer. The most
ments when any electric power generating units
economical way of obtaining acceptable noise lev-
on the site are to be paralleled with the utility.
els is to locate the station at least 100 feet from
The utility may also have special requirements for
the nearest facility.
b. Appearance. The following requirements not
protection and coordination of its system on a
nonparalleled installation. Some utilities have car-
only assure that the physical appearance of the
rier relaying schemes, and may require the Gov-
station will be acceptable, but should decrease
ernment to provide line relays, or companion type
maintenance problems.
(1) Structure-mounted equipment. The use of
relays, power supplies and housing for carrier
relaying equipment. Auxiliary equipment such as
metal structures with tubular or H-beam supports
batteries and chargers, annunciator panels, and
is considered the most desirable design. The con-
ventional lattice structure is unattractive in ap-
supervisory or telemetering equipment may need
to be provided or housed or supplied. Written
pearance and more difficult to maintain. Except
utility requirements and approval of the system
for incoming line structures which require the
4-3
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