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.
- 1. Generate better designs by comparing
- 2. Improve accuracy with DAPPER’s rigorous
- 3. Save time by sharing a common project
database and interface.
- 4. Improve consistency with standard design
- 5. Design safer systems by comparing
calculations with short circuit and continuous ratings.
- 6. Communicate designs effectively with
presentation quality graphics, reports, and equipment schedules.
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
- Models radial, loop, and multiple independent
- Models utility and generator equivalent
impedance calculated from short circuit duty.
- Models up to 50 utilities/swing bus generators.
- Models up to 400 regulated and unregulated
- User definable per unit driving voltage at each
utility and swing bus generator.
- Models transformer primary and secondary taps
and off nominal rated voltages.
- Full transmission line modeling with built in
line parameter calculators.
- Models any combination of motor and non-motor
loads with global and/or local load factors.
- Models any combination of constant kVA,
constant impedance and constant current loads.
- Reports bus voltage, voltage angle, and voltage
drop at each bus.
- Reports branch voltage drop, power flow in kW,
kVAR, kVA, Amps and power factor.
- Reports branch loss in kW, kVAR, kVA, and total
- User definable report criteria for bus and
branch voltage drops.
- Percentage voltage drops based on system
voltage per ANSI standards.
- Double precision calculations improve solution
- Rapid solution convergence.
- Suitable for impact motor starting, capacitor
placement and power factor studies.
- Load flow results validated to match with
benchmark calculations and IEEE examples.
The DAPPER Comprehensive Fault
provides a network solution of three-phase, single-line to ground,
line-to line, and double line to ground 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.
- Symmetrical and Asymmetrical values reported at
1/2, 3, 5, and 8 cycles.
- Asymmetrical values reported at user selected
- Asymmetrical values reported as peak or RMS
- Models two and three winding transformer taps,
phase shift, and off nominal rated voltages.
- Asymmetrical exponential DC decay is based on
X/R to each contribution.
- Reports Thevenin equivalent impedance and X/R
at the faulted bus.
- Detailed and summary reporting options.
- Reports bus voltages and branch flows
throughout the system for each faulted bus.
- Reports phase or sequence current and voltage.
- Reports ground return current for double line
to ground faults.
- Models transformer and generator neutral
- Reports Connected, Demand, and Design loads.
- All load calculations account for individual
load power factors.
- Automatically creates input load data for Load
Flow and Voltage Drop Studies.
- Automatically creates loads for sizing feeders
- System demand loads calculated using methods
recognized by the NEC.
- Automatically tracks largest motor fed by each
bus to meet NEC requirements.
- Automatic compliance with NEC and local codes
for multi-level load diversity.
- Sensitivity studies, future load growth studies
and load diversity studies by scaling load factors globally.
- "What if" analysis of loading conditions, i.e.
light loading versus normal loading, or winter versus summer loading.
utility company requirements for providing a load summary by load type
for connected, demand, and design loads at each utility bus.
- Generate sufficient information for sizing
feeders, transformers, and other elements of the power system.
AND TRANSFORMER SIZING:
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.
- AWG, Bus Duct, ACSR, or metric sizes may be
- Feeders and transformers with "Do Not Size" are
evaluated for capacity.
- Feeder libraries permit user to include metric
sizes and ampacity.
- Transformers can be sized to Demand or Design
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
- Schedules are automatically updated with
available short circuit values and sub-feed totals.
- Switch board schedules are automatically
generated from connected branch loads.
- MCC schedules can reference a default design
library for automatic
selection of feeder and raceway sizes, or the complete cable library
for more detailed specification.