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DAPPER Demand Load
Analysis
Demand Load
Analysis
The DAPPER Demand Load Analysis
program provides a consistent summary of the loads throughout the power
system. Connected loads, demand loads, and design loads are calculated for
each load bus. All load calculations are based on the global application
of demand and design factors and on the complex addition of the loads, to
properly account for the differences between load types. This method
assures complete compliance with local and national electrical code
requirements while permitting flexibility in design for special
applications.
Loads can be divided into user definable load
categories such as lighting, receptacles, heating, or complete industrial
processes. Different design and demand factors can be assigned to each load
category.
The demand load information can be used directly by the DAPPER sizing and load
flow and voltage drop modules. This data calculation procedure greatly
simplifies the user interface while providing rigorous analytical results.
Feeder, Raceway and Transformer Sizing
DAPPER will size feeder cables,
earth wires,
raceways, bus ducts, duct banks and transformers throughout the power system
to the load requirements calculated by the Demand Load Analysis program.
Feeders are selected to meet user-defined criteria for conductor material,
voltage level, insulation type, and environmental conditions.
A transformer's
primary and secondary feeders are sized to the transformer's
full load as
specified by the user. Feeders can be specified as new or existing. New
elements will be sized to meet loading conditions; existing elements are
reported and evaluated to the system loading. Notices are issued if the
loading exceeds the rating of the existing branch element.
Load Flow/Voltage Drop
The voltage drop on each feeder branch, the
voltage on each bus, the projected power flow through the power system, and
the losses in the power system are calculated by this program. The program
will evaluate the actual branch and bus voltage drops then compare them to
user-specified voltage drop criteria. Values that exceed the specified voltage
drop criteria are flagged.
Loads can be modelled as any combination of constant kVA, constant current and
constant impedance. Transformer tap positions can be specified by the user.
This program can be used for conventional voltage drop analysis, loss
analysis, power factor studies, capacitor placement, long-line charging
effects, impact loading for motor starting studies and co-generation analysis.
System loading conditions can be automatically and selectively scaled by load
category for analysis of full and light loading conditions by using the demand
load library. Individual system loads can be scaled or removed from service to
represent different operating conditions.
Traditional Fault Analysis
The DAPPER Comprehensive Fault Analysis program
provides a network solution of three-phase, single-phase to earth, phase to
phase, and two-phase to earth fault currents; RMS momentary fault currents;
asymmetrical fault duties at three, five, and eight cycles; and the positive,
negative, and zero sequence impedance values at each fault location. The
program accounts for all impedance values between each fault location and
contributions from utilities, generators, and motors. At each fault location,
the direction, X/R, and magnitude of fault currents are reported, thus
providing a clear view of the conditions that exist during the fault.
Load Schedule Documentation
The DAPPER Load Schedule module provides detailed
documentation of load fed through Panels, Motor Control Centers (MCCs) and
Switchboards. Input is simplified through the use of libraries and copy and
paste functions. The schedules can be displayed and printed in a variety of
different formats.
Download the brochure in PDF format:
PTW_DAPPER.pdf (1.3MB)
Download
Acrobat Reader - version 5.0 (or above) required.
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