The Constant Voltage Transformer- CVT is specially used in institutional, government, Railway sectors, etc. Bhawani Digital Systems Pvt. Ltd. Manufactures Constant Voltage Transformer- CVT. Bhawani Digital Systems Pvt. Ltd. Is an ISO 9001:2008 certified company that offers UPS Systems, Automatic Voltage Regulators, Constant Voltage Transformer, Voltage Stabilizers/Correctors, Inverters, Transformers, Power Supply, Battery and Chargers. In the Constant Voltage Transformer no semiconductor or moving part used and thus it is very reliable.