Karan

• Jul 4th, 2006

 

When Synchronous Motor's field winding is 'Over Excited' it supplies the KVARs back to the the supply lines. This property is similar to the Capacitor/Condenser. Hence its name.

Moreover its more effective then any capacitor and used to be smaller in size to the equvelent capacitor bank.

For more details you can refer 'Power System' by 'CL Wadhwa'.

Or, directly mail me at karan.sorout@gmail.com  

v.sudhirV

• Jul 7th, 2006

 

When the field winding of the syncronous motor is over is over excited it acts like a synchronous capacitor provided the mechanical load is not connected.

cvk

• Oct 6th, 2007

 

For a synchronous motor to continue running, the required reactive power for magnetic field creation is normally supplied by the by system to which it is connected. But if the motor is over excited i.e. it is made to generate reactive power in excess of self requirement, it supplies reactive power to the system. At the position where reactive power generated is just self sufficient, the power factor is unity. When the synchronous motor supplies reactive power, like a capacitor / condenser, it is called a synchronous condenser. For this operating condition the motor has to be lightly loaded to take care of temperature rise of the motor.

Ankit naugraiya

• Oct 21st, 2007

 

When synchonous motor is in over excited mode and run at leading power factor, it works like a sychonous condensor.

ASIF JAVAID

 Profile Answers by ASIF JAVAID 

• Dec 9th, 2007

 

overexcited  synchronous motor behaves like a condenser  or a capacitor

arun uday rana

 Profile Answers by arun uday rana 

• Aug 8th, 2008

 

A synchronous motor act as a synch. Condenser when the its field winding is overexcited and there is no load attached with it. The basic application of this phenomenon can be seen in the hydro power plant  in peak load hours, when the grid supplies power to the plant to improve the power factor of the grid. Then the generators in the plant act like motor and in over excited mode act as synchronous condenser (capacitive load).