How to Select a Suitable Diesel Generator
by Starlight Generator dieselgeneratortechDiesel generator set is
a common emergency power supply in civil buildings, the proper selection of
diesel generator set is an important problem in the electrical design of civil
buildings. So when we choose self-contained diesel generator set, how to select
a suitable capacity according to the load?
1.Setting
principle.
Class I high-rise
buildings shall be supplied power according to class I load requirements. Class
II high-rise buildings shall be supplied power according to class II load
requirements.
Article 3.1 of code for
electrical design of civil buildings (JGJ / t16-92): The primary load shall be
supplied by two power sources, when one power supply fails, the other power
supply should not be damaged at the same time; When the secondary load
conditions permit, two-way power supply should also be used for power supply,
especially the secondary load for fire protection, the power supply shall meet
the requirements of two return circuits. For the particularly important load in
the primary load, in addition to the above two power supplies, emergency power
supply must be equipped.
According to these
regulations, Starlight manufacturer summarizes the setting principles of the
self-contained diesel generator set:
A.When the power supply
of civil buildings is required to meet the requirements of class I load, ff the
city power grid can provide two independent power sources (one for use and one
for standby or mutual standby), we do not need to equip with diesel generator
set. However, when there is a particularly important load in the primary load,
the diesel generator set shall be generally set as the emergency power supply.
B.When the grid can only
provide one way of power supply, in order to meet the power supply requirements
for the primary and secondary loads, diesel generator sets shall be set
generally. At this time, the diesel generator set will be used as standby power
supply and emergency power supply. In large and medium-sized commercial
buildings, in order to ensure that the interruption of power supply will not
cause great economic losses, it is also advisable to set up diesel generator
set. Because the city power grid cannot be completely independent, sometimes
when one power supply sources fails or is overhauled, another power supply
sources may fail at the same time. Therefore, in order to ensure the reliable
power supply of fire fighting and other important equipment (such as
intelligent equipment, communication equipment, etc.) in civil buildings,
diesel generator sets are generally set, even if there are two or more power
supplies.
2.Selection
of diesel generator set capacity.
For selection of
self-contained diesel generator set capacity, there is not a unified
calculation formula. Some are simply determined by 10% - 20% of the capacity of
power transformer. Some count by the total capacity of fire fighting equipment.
If the capacity selection is too large, it maybe cause a waste of investment,
the capacity is too small, it maybe not meet the use requirements in the event
of an accident. So, how to choose the capacity of self-contained generator set?
A.Scheme or preliminary
design stage.
The capacity of the
self-contained generator set is calculated as 10% - 20% of the total capacity
of the power supply transformer.
B.Construction drawing
stage.
The power load of
buildings can be divided into three categories:
The first type is
security load. It means the load to ensure the safe and reliable operation of
people and equipment in the building. Such as fire pump, fire elevator, smoke
control equipment, emergency lighting, communication equipment, important
computer and related equipment, etc;
The second type is the
guaranteed load, that is, the basic equipment load to ensure the operation of
the building, mainly including the working area lighting, part of the elevator
and the passage lighting;
The third type is
general load, i.e. other loads besides the above loads, such as air
conditioning, water pump and other general lighting and power equipment.
When the buildings must be equipped with diesel generator, the first type of load shall be taken into account.
The second type of load
is determined according to the function of the building and the situation of
the power grid. If the functional requirements of the building are high or the
power supply of the city power grid is unstable, the second type of load shall
be taken into account. However, if the first and second types of loads are
simply added to select the diesel generator capacity, the selected capacity is
too large. Because in the state of fire protection, only the operation of
fire-fighting equipment shall be ensured, and the second type of load has not
be used. While the power grid is cut off in non fire-fighting state, the
fire-fighting equipment will not be used. We can select the larger one of the
two capacities as the capacity of diesel generator set.
We should select
different diesel generator capacity according to different requirements. If
you do not know how to select, you can ask engineer or electrician to count for
you.
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Created on Dec 3rd 2019 01:34. Viewed 317 times.