Guida Tecnica Technical Guide Ratings Book Potenze

Environmental Considerations
Temperature and Altitude
ALTITUDE DERATIONS / ENVIRONMENTAL
Temperature and altitude – individually or combined, have an effect on the generator power
available. Temperature may be considered as both the air inlet to the generator and also the
ambient air around the generator. When the ambient air or air entering the generator exceeds 40º
C, or 104º F, it becomes necessary ALTITUDE to derate DERATIONS the output of the / generator. ENVIRONMENTAL
The chart below gives
the recommended amount to adjust for the higher temperatures.
Higher Environmental altitudes also Considerations
require a derate, specifically when it exceeds 3300 ft., or 1000 Meters. Again,
please refer to the Altitude Deration Chart below to determine the necessary derate.
Temperature and Altitude
Environmental Concerns
Both temperature and altitude have a parasitic effect on generator operation- they both may require a 'derate'
of the available kW that is displayed on the nameplate. When the ambient or outside temperature exceeds
Generators are often exposed to harmful airborne pollutants, like sand and saltwater which may
require 40 o C, or some 104 o F, form it becomes of protection necessary to reduce to derate or the eliminate output of these generator. harmful The agents. chart below Common gives elements the
like recommended dirt, gravel amount or rock to dust adjust can for this create higher abrasive temperature. and potentially damaging effects on the windings
of Higher the generator. altitudes also While require the a addition derate, specifically of filters, when baffles, it exceeds or housings 3300 ft., will or certainly 1000 Meters. help Again, extend please the
life refer of to the the protective Altitude Deration insulation, Chart it below may to be determine equally the effective necessary to overcoat derate. the windings at point of
manufacture. Environmental It is Concerns also extremely important to recognize that filters and other devices can affect
the Generators airflow are through often the exposed generator harmful and airborne create pollutants, additional like heat sand in the and windings. saltwater which It is also may require important someto
understand form of protection that the to reduce use of or filters eliminate requires these a harmful strict maintenance agents. Common regime. elements like dirt, gravel or rock dust
Mecc can create Alte abrasive has a variety and potentially of insulation damaging treatments effects on which the windings can add of years the generator. of life to While your the generator, addition of and
ensure filters, baffles, that the or housings windings will are certainly protected help in extend these the harmful life of the environmental protective insulation, applications. it may be Please equallyrefer
to effective our separate to overcoat Technical the windings guide: at point Insulation of manufacture. Protection It Systems is also extremely for further important guidance. to recognize that
filters and other devices can effect the airflow through the generator and create additional heat in the windings.
Please consult your Mecc Alte Representative for application reviews and recommendations
Mecc Alte has a variety of insulation treatments which can add years of life to your generator,
and insure that the windings are protected in these harmful environmental applications.
Please consult your Mecc Alte Representative for application reviews and recommendations.
Humidity and Moisture
Humidity and Moisture
Another Another common common enemy enemy of the of the insulation insulation system system is high is humidity, high humidity, salt air and salt moisture. air and While moisture. the windings While the
windings
are certainly
are
protected
certainly
against
protected
these
against
conditions,
these
space
conditions,
heaters and
space
housings
heaters
with proper
can be
ventilation
added insurance
can be
to promote long life and trouble free operation. The location of the unit and operating conditions
added insurance to promote long life and trouble free operation. The location of the unit as well as the
with proper ventilation are both important considerations when determining what protection is
operating conditions are important considerations when determining what protection is required. Once again,
required. Once again, please consult your Mecc Alte Representative for assistance in selecting
Please consult your Mecc Alte Representative for assistance in selecting proper protection and modifications.
proper protection and modifications.
Altitude and Ambient Temperature Deration Coefficients
AMBIENT TEMPERATURE ( o C)
ALTITUDE (Meters) 25 40 45 50 55 60
< 1000 1.07 1 .96 .93 .91 .89
1000 - 1500 1.01 .96 .92 .89 .87 .84
1500 - 2000 .96 .91 .87 .84 .83 .79
2000 - 3000 .90 .85 .81 .78 .76 .73
Technical Guide: Ratings Book 29