Accommodating the air-insulated switchgear (AIS) substation on the hill's slope with an elevation difference of 34 meters between the highest and the lowest points was facilitated by a customized approach to design and structure. The solution included spreading the equipment across 25 tiers with walls up to 12 meters high and 2 meters wide to stabilize the tiers of the terraced substation.

"We commend the ABB team on their creative and problem-solving approach and their commitment to executing this challenging project at multiple tiers taking all safety measures," said Deep Sah, Chief Engineer (Projects) at PTCUL.

As part of the turnkey contract, ABB India designed, supplied, installed and commissioned the 400/220 kV substation including switchgear, power transformers as well as a reactor. Reactors are used for reactive power compensation, helping to increase energy efficiency on long transmission lines. The substation is also equipped with IEC 61850-compliant automation, protection and communication systems to enable local and remote monitoring and control of all substation assets.

ABB India has previously built a 400 kV substation at Kashipur, Uttarakhand, successfully and commissioning the project on time, which laid the foundation for the award of the Khandukhal project.

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