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Transient Motor Starting
(TMS) Study Module
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The Transient Motor Starting Analysis module (TMS) is a state-of-the-art
time simulation
program to analyse all aspects of motor starting problems accurately.
TMS models up to 1,500 motors dynamically throughout starting, stopping or
reacting to load changes. In order to completely examine motor starting
problems, TMS has the capability to dynamically represent motors which are
already on line at the beginning of the simulation.
The complete network is continuously modelled throughout the time simulation
in order to properly represent the interactions between motors and to be
able to examine the effects of static loads, transformer taps, generator
voltage set-points, and all other network parameters.
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Benefits:
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Quickly examine and evaluate motors in your
system for a variety of situations including group motors starting, motor
starting with different system load configurations, motor start heating
problems, and evaluation of up to 9 motor starter types for reduced voltage
starting schemes. |
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Design efficient systems by determining
optimal timing of staggered motor starting and re-acceleration schemes. |
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Customise solutions with adjustable source
voltage, include/exclude utility source equivalent impedance, and
user-definable time-step for analysis. |
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Communicate designs effectively with
professional graphics and reports. |
TMS Output:
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Bus voltage |
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Motor voltage |
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Motor rotor current |
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Load torque |
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Motor speed |
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Motor stator current |
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Motor torque |
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Accelerating torque |
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Motor slip |
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Reactive power (kVAR) |
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Power factor |
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Real power (kW) |
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Total power (kVA) |
Features:
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Compare alternative designs graphically on a
single plot. |
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Analyse torque speed characteristics of motors
in actual system operation. |
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Analyse motor load changes. |
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Determine voltage dip impact of motor
starting. |
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Determine motor accelerating times. |
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Create user defined graphical data for loads
and motors. |
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Includes typical models for pumps, fans,
compressors, grinders, blowers, and MG sets. |
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Evaluate the interaction between multiple
motors during starting conditions. |
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Evaluate motor starting with different system
load conditions and network configurations. |
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Evaluate motor starting heating problems (I2t). |
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Evaluate application of reduced voltage
starters. |
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Determine the optimal timing of staggered
motor starting and re-acceleration schemes. |
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Determine the impact of motor starting on
other on-line motors. |
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The time related output data includes bus
voltage, motor speed, motor slip, motor torque, load torque, accelerating
torque, stator voltage, stator current, input power, VARs, power factor, and
rotor current. |
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Time and voltage dependent switching is
provided to start or trip motors or to enact motor load changes. |
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Switch motors based on group and priority in
motor group acceleration setup. |
Motor Starter Options:
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Series resistance |
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Series reactance |
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Solid state, current limit |
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Solid state, voltage ramp |
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Solid state, current ramp |
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Full voltage |
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Auto transformer |
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Part winding |
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Star-delta |
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Shunt capacitors |
Solution Modelling:
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Models stator and rotor circuits of multiple
motors with the entire system network in order to model interaction between
motors. |
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Load models include torque-speed equations for
fans, pumps, linear functions of speed, and user specified torque speed
curves. |
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Utilises a load flow solution to model
multiple motors within the full network for each time step. |
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Network may include any combination of
constant kVA loads, constant current loads, and constant impedance loads as
well as generators which can schedule power and voltage within VAR limits. |
Download the brochure in PDF format:
PTW TMS (1.6MB)
Download
Acrobat Reader - version 5.0 (or above) required.
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