How can I provide high voltage to test equipment when supply voltage is 230 voltage ?
A variable voltage autotransformer (also known as variac) is a transformer which is able to transform or produce AC mains voltages at different desired levels at its output. Thus unlike an ordinary transformer its output voltage is not fixed, rather can be varied manually to obtain more than a single voltage. The voltage obtained from such a device is normally an AC at mains level, which may be higher or lower than the applied input voltage depending upon its settings.
Method 1:when we use single phase
Variac provide normally up to 270 voltages. but some time we will doing the test of led bulb etc load at 450-500 voltage because of some time electricity will coming phase to phase ,for solution to this problem we will using step up transformer with variac .
IMAGES: SINGLE WINDING VARIAC
IMAGE: Low voltage convert in high voltage through transformer using variac.
Method 2: when we use double winding variac
The normal output range of variac is 0 to 270 volt in single phase.
When testing of load at 2 phase supply we use special variac.This variac made up of two winding.
Image : Two winding variac
IMAGE: low voltage convert in high voltage when we use two winding variac.
Method 3: when we use 3 phase supply using variac
When testing of load at 2 phase supply we use special variac.This variac made up of three winding.
The normal output range of variac is 0 to 470 volt in three phases. Three such variable auto transformer when connected electrically in star & mechanically in tandem, became suitable for operations of 415 v 3 phase a.c. supply & to give output of 0 – 415 v or up to 470 volts.
Image: 3 phase supply variac
Image: low voltage convert in high voltage using 3 phase supply variac
Our knowledge there are some companies which are providing variac in the India. for your help we are giving below the name of some companies. For your kind of information we are not responsible for any problem.
We are providing reference of some of the companies we or our customers have recommended.
You can have direct delaing with them. We are only providing information.
Variac Suppliers Companies
Plot No.A-420, Road No.28,
Opp. Emco Co., Ram Nagar,
M.I.D.C., Wagle Estate, Thane (W) – 400604
91-22- 2582 4626 / 17
2 Green dot electric limited
G-9 Hemkunt Tower /
New Delhi 110 019
Phone : +91 11 2622 2088
FAX : +91 11 2622 2088
3 contact no.- +919910558428