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Advantages/disadvantages of different motor starters
Tags: Comparison
The advantages/disadvantages of different types of motor starters like DOL, star/ delta, korndorfer, primary resistance/reactance, shunt capacitance, slip ring, vfd, vsd, auto transformer etc.
DOL (simple start up but reflect to high voltage drop, high starting current, low starting period duration)less power saving.
star/delta decrease the starting current to 1/3 but required many relays for control change between start connection then to delta.
Auto transformer used for MV application by connect less voltage on motor during start up then change to nominal voltage on motor terminals after start up where reflect to decrease the starting current and decrease the voltage drop but increase the starting duration (very expensive where required 3 MVCB one for motor and one for primary of auto and one for secondary of auto).
VSD or VFD used for application where its worked with inlet guide van or valve (variable load) to make power saving.
Capacitor used to avoid the voltage drop during motor start up but may cause many problems like resonance.
DOL (simple start up but reflect to high voltage drop, high starting current, low starting period duration)less power saving.
star/delta decrease the starting current to 1/3 but required many relays for control change between start connection then to delta.
Auto transformer used for MV application by connect less voltage on motor during start up then change to nominal voltage on motor terminals after start up where reflect to decrease the starting current and decrease the voltage drop but increase the starting duration (very expensive where required 3 MVCB one for motor and one for primary of auto and one for secondary of auto).
VSD or VFD used for application where its worked with inlet guide van or valve (variable load) to make power saving.
Capacitor used to avoid the voltage drop during motor start up but may cause many problems like resonance.
what are the drawbacks of soft starter compared to VFD?
can you tell me selection criteria of different starters powerwise.like below 7.5KW DOL is recomended.
main advantages of dol starter are
1.cost is less(star delta starter contains 3 contactors, a timer dol
contains a contactor only).
2.protection(it contains over current protection devices.star delta
starter also contains this)
3.less space is required
but it is used only for small motors like power less than 7.5,10Hp
1.cost is less(star delta starter contains 3 contactors, a timer dol
contains a contactor only).
2.protection(it contains over current protection devices.star delta
starter also contains this)
3.less space is required
but it is used only for small motors like power less than 7.5,10Hp
How can I calculate the energy usage of an across the line motor starter vs an soft start?
what is the advantage of auto transformer over VFD and soft switch on a high lift electric motor rated 450kw
We need to consider proper cooling and insulation due to Harmonics produced by electronics soft starters.
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