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DAPPER
Studies
DAPPER is an integrated set of modules for
three-phase power system design and analysis including rigorous load flow and
voltage drop calculations, impact motor starting, traditional fault analysis,
demand and design load analysis, feeder, raceway and transformer sizing, and
panel, MCC, and switchboard schedule specification.
Benefits:
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Generate better
designs by comparing alternatives quickly. |
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Improve
accuracy with DAPPER’s rigorous solution methods. |
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Save time by
sharing a common project database and interface. |
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Improve
consistency with standard design libraries. |
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Design safer
systems by comparing calculations with short circuit and continuous ratings. |
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Communicate
designs effectively with presentation quality graphics, reports, and
equipment schedules. |
LOAD FLOW/VOLTAGE DROP:
With DAPPER, users can calculate the voltage
drop on each feeder and transformer branch, voltage on each bus, projected power
flow, and losses in the power system.
This program may be used for conventional
voltage drop analysis, loss analysis, power factor studies, capacitor placement,
long-line charging effects, impact loading for motor starting studies, generator
sizing, and for cogeneration analysis. With DAPPER, a single load flow program
models loop and radial power systems. Double precision sparse matrix current
injection solutions are used for faster, more accurate conver-gence. This allows
for better modeling of ill-conditioned systems.
Features:
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Models radial,
loop, and multiple independent systems. |
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Models utility
and generator equivalent impedance calculated from short circuit duty. |
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Models up to 50
utilities/swing bus generators. |
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Models up to
400 regulated and unregulated co-generators. |
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User definable
per unit driving voltage at each utility and swing bus generator. |
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Models
transformer primary and secondary taps and off nominal rated voltages. |
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Full
transmission line modeling with built in line parameter calculators. |
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Models any
combination of motor and non-motor loads with global and/or local load
factors. |
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Models any
combination of constant kVA, constant impedance and constant current loads. |
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Reports bus
voltage, voltage angle, and voltage drop at each bus. |
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Reports branch
voltage drop, power flow in kW, kVAR, kVA, Amps and power factor. |
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Reports branch
loss in kW, kVAR, kVA, and total system losses. |
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User definable
report criteria for bus and branch voltage drops. |
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Percentage
voltage drops based on system voltage per ANSI standards. |
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Double
precision calculations improve solution accuracy. |
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Rapid solution
convergence. |
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Suitable for
impact motor starting, capacitor placement and power factor studies. |
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Load flow
results validated to match with benchmark calculations and IEEE examples. |
COMPREHENSIVE FAULT ANALYSIS:
The DAPPER Comprehensive Fault Analysis
program provides a network solution of three-phase, phase-earth, phase-phase,
and phase-phase-earth fault currents; RMS momentary fault currents; asymmetrical
fault duties at three, five, and eight cycles; the positive, negative, and zero
sequence 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.
Features:
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Symmetrical and
Asymmetrical values reported at 1/2, 3, 5, and 8 cycles. |
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Asymmetrical
values reported at user selected fault time. |
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Asymmetrical
values reported as peak or RMS values. |
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Models
two-winding and three-winding transformer taps, phase shift, and off-nominal
rated voltages. |
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Asymmetrical
exponential DC decay is based on X/R to each contribution. |
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Reports
Thevenin equivalent impedance and X/R at the faulted bus. |
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Detailed and
summary reporting options. |
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Reports bus
voltages and branch flows throughout the system for each faulted bus. |
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Reports phase
or sequence current and voltage. |
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Reports ground
return current for double line to ground faults. |
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Models
transformer and generator neutral grounding impedances. |
DEMAND LOAD ANALYSIS:
Features:
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Reports
Connected, Demand, and Design loads. |
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All load
calculations account for individual load power factors. |
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Automatically
creates input load data for Load Flow and Voltage Drop Studies. |
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Automatically
creates loads for sizing feeders and transformers. |
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System demand
loads calculated using methods recognized by the NEC. |
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Automatically
tracks largest motor fed by each bus to meet NEC requirements. |
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Automatic
compliance with NEC and local codes for multi-level load diversity. |
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Sensitivity
studies, future load growth studies and load diversity studies by scaling
load factors globally. |
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"What if"
analysis of loading conditions, for example light loading versus normal
loading, or winter versus summer loading. |
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Meet utility
company requirements for providing a load summary by load type for
connected, demand, and design loads at each utility bus. |
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Generate
sufficient information for sizing feeders, transformers, and other elements
of the power system. |
FEEDER AND TRANSFORMER SIZING:
DAPPER will size feeder cables, ground 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. Transformer primary and
secondary feeders are sized to the transformer full load as specified by the
user. Feeders and transformers may be included, excluded or evaluated in the
sizing study.
Features:
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AWG, Bus Duct,
ACSR, or metric sizes may be used. |
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Feeders and
transformers with "Do Not Size" are evaluated for capacity. |
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Feeder
libraries permit user to include metric sizes and ampacity. |
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Transformers
can be sized to Demand or Design load. |
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Sizing to the
IEE wiring regulations is available. |
LOAD SCHEDULES:
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, printed, and exported in a
variety of different formats.
Features:
Download the brochure in PDF format:
PTW_DAPPER.pdf (1.3MB)
Download
Acrobat Reader - version 5.0 (or above) required.
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