BHEL Floats Inverter Transformers Tender for Raghanesda Solar Park Phase II

Bharat Heavy Electricals Limited (BHEL) has issued a tender for the development of ONAN type, 8.8 MVA & 6.4 MVA, 33kV/690V-690V, 3-phase, 3-winding, inverter duty transformers for Gujarat State Electricity Corporation Limited’s (GSECL) 100MW Phase-II Raghanesda solar PV project.

This details concerning the technical specifications, supply conditions, erection and commissioning and post-commissioning requirements for the project are given below:

The pre-qualification criteria is the following:

• The manufacturer should have experience of supply of transformers of cumulative Capacity of 50MVA (minimum rating of each transformer 2.5MVA, 33KV) within last 5 Years prior to the publication of this tender. As evidence to this, vendor shall submit completion or commissioning certificates from end user (Developer/EPC Company) along with copies of Purchase Orders for transformers.
• The manufacturer should have experience of supply of at least 1 No. of transformer of the following rating to SPV Plants within last five years prior to the publication of this tender: MVA Rating: 5 MVA or higher Voltage Class: 33kV or more Type: 3-Winding or more. As evidence to this, vendor shall submit completion or commissioning certificates from end user (Developer/EPC Company) along with copies of Purchase Orders for transformers.

Some of the key technical specifications, as mentioned in the tender document, are as follows:

• Transformer type: Outdoor, oil-immersion type ONAN, Inverter Duty. Inverter Transformer shall be designed for at least 5% total harmonic distortion (THD)
• IP class: Transformer, including the cable box and marshalling box shall be of IP55.
• Application: Grid-connected solar photovoltaic power plant.
• Governing Standards:

• No. of phases: 3
• Frequency: 50 Hz, +/- 3%
• HV winding One 3-phase winding with Star connection. HV voltage: 33KV
• LV windings Two independent 3-phase windings, each with Delta connection.
• Winding material: Electrolytic grade copper for both HV and LV windings.
• Winding Insulation: Class A
• Neutral on HV side: Neutral terminals of HV windings shall be brought out separately through bushings.

State-owned BHEL is an engineering and manufacturing enterprise based in New Delhi. It is under the ownership of Ministry of Heavy Industries, Government of India. Established in 1956, BHEL is India’s largest power generation equipment manufacturer.