Bharat Heavy Electricals limited (BHEl) has successfully indigenously developed, manufactured and commissioned India’s first Phase Shifting Transformer (PST) Kothagudem Thermal Power Station (KTPS) Stage-VI in Telangana
Reposing faith in BHEl’s capability to successfully introduce new technology products, Telangana State Power Generation Corporation limited (TSPGCl, erstwhile APGENCO) had placed an order to BHEl for the country’s first Phase Shifting Transformer (PST).
The 400 KV/220 kV, 315 MVA rating PST shall be utilised to control and improve the power flow between 400 kV and 220 KV network in either direction by providing phase shift as per the system requirement. The PST has been designed to provide phase shift of +15 degree.
A Flexible AC Transmission System (FACTS) device, the PST is a combination of a shunt and a series transformer. Significantly, with the commissioning of the above PST, the existing overloaded 220 KV lines shall be relieved and power can be pushed through the 400 KV transmission line, thus improving the transmission efficiency of both 400 KV and 220 V lines, and also avoiding grid collapse in case of system instability. In fact, the remarkable benefits derived by transmission networks through deployment of PST, is an outstanding smart grid solution in true sense.
In the field of power quality improvement, the company has fully established its capability to undertake new products/systems using technologies developed in-house like Controlled Shunt Reactors and Grid Compensation Schemes like FSC, STATCOM for utility applications.
BHEl’s transmission business group and corporation, R&D have carried out system studies and substation design while the PST was being manufactured at the company’s Bhopal plant. It has an overall capacity of manufacturing power transformers of 45,000 MVA per annum out of which its Bhopal plant has an annual capacity of 30,000 MVA. The plant is equipped with state-of-art facilities to manufacture transformers up to 1,200 KV.