Thursday, October 3, 2013


Linear Regulator with rolling contact carbon              roller assembly                                                                                                                                    
Dimmer Regulator with sliding contact carbon brush assembly (POWERWARE)
1.This design is non standard as no IS
specification has been drawn out for it.


All three phases are controlled with a
single motor and hence not suitable
for unbalanced loads.

3. Roller contact has point contact which
results in high current density causing
sparking & pitting.

4. Wear and tear of carbon rollers due to
friction and that of copper winding due to

5. Replacement cost of carbon roller is much

6. No load losses are very high,so in
case where load is fluctuating from 0 to
100% overall energy losses are more.

7. Requires more quantity of oil which
increases its size

8. Offers a warranty of 5 years
1. It is governed by the IS 9815 standard of BIS( Bureau of Indian Standards).


All three phases can be controlled with independent motors and hence can be used for either unbalanced or balanced type.

3.Carbon brush has large area of            contact hence current density is            very low and gives a smooth operation.

4. Wear & tear is only of carbon brush   which is very cheap & inexpensive.

5. Only brush has to be replaced which is much cheaper.

6. Very low No Load losses with very high efficiency of about 99%.

7. Since efficiencies are high it requires less quantity of oil in some cases.

8. Offers a warranty of 7 years.

                                                                                                                                                                                                                         Features of POWERWARE Servo Voltage Stabilizers (sliding type carbon brush)

1. Powerware Servo Voltage stabilizer is rated for continuous duty at 100% loading. Our normal model can be overloaded to 110% for 30 minutes while our heavy duty model can be overloaded to 160% for 30 minutes.
2. It is suitable for jerk loads.
3. High efficiencies upto 99 % are possible.
4. Have a robust performance with a life of 15 to 20 years.
5. Warranty upto 7 years.
you can visit our website for more updates:


At February 18, 2014 at 5:54 PM , Anonymous Anonymous said...

Thanks for sharing this info, the main fact that makes ROLLER & SLIDING TYPE CARBON BRUSH different is that the ROLLER brushes are only for balanced loads where as SLIDING brushes are used where we need to deal with unbalanced load.
Carbon Brush

At February 18, 2014 at 7:57 PM , Blogger Sai Electricals said...

thanks for your feedback Mr. Manoj. If you have any query regarding this free feel to contact us at

At April 4, 2014 at 8:15 PM , Anonymous Anonymous said...

very informative looking for more articles on desingn of buck boost transformer etc

At April 4, 2014 at 8:20 PM , Anonymous Anonymous said...

very good

At April 4, 2014 at 9:14 PM , Blogger Sai Electricals said...

Thanks for your feedback Mr. Praful Muju

At April 4, 2014 at 9:15 PM , Blogger Sai Electricals said...

Thanks for your feedback


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