Sectors
Power
Sub Sectors
Transmission & Distribution
Services
Design & Engineering
Location
Northern India
This project involved review engineering services for a transmission and substation system comprising approximately 150 kilometres of 400 kV double circuit HTLS transmission lines and three GIS substations at 400 kV and 220 kV levels. The transmission line packages included Aligarh to Pirthala 400 kV double circuit HTLS line of 49.24 kilometres, Pirthala to Kadarpur 400 kV double circuit HTLS line of 28.96 kilometres, Kadarpur to Sohna Road 400 kV double circuit HTLS line of 10.28 kilometres, Neemrana to Dhanonda 400 kV double circuit HTLS line of 46 kilometres, and a line in line out section at Sohna Road substation of 0.560 kilometres.
The substation scope included 400/220 kV GIS substations with two x 500 MVA transformer arrangements at Kadarpur, Sohna and Pirthala, along with reactors and provision for future expansion in each substation. The project also included a 400 kV multi circuit monopole structure for dead end towers, a vertical GIS building with two floors using pre engineered building structures, and special transmission features including 400 kV Yamuna river crossing towers. Execution was planned in multiple packages, with more than 400 tower locations, more than 50 crossings and several critical towers, including 132 kV line crossings and severe right of way constraints. The asset minimum design life requirement was 30 years.
TCE's Scope
TCE provided review engineering services. The scope included engineering review and identification of key design and operational risks. While design validation was not originally part of the scope, a major variation was identified in a pre engineered building design and was escalated for clarification, following which the design defect was acknowledged by the original design agency and TCE was awarded additional scope for structural strengthening. TCE also documented operation and maintenance philosophy for the 220 kV yard and transformer maintenance and highlighted risks, common spare adequacy and missing spares, and categorised risks based on severity with mitigation suggestions where feasible or impact highlighting where required.
Impact
The review engineering scope improved project robustness by identifying a major structural design variation and enabling corrective strengthening actions. Documented operation and maintenance philosophy and structured risk categorisation improved readiness for long term operation of 400 kV and 220 kV assets, particularly across a network involving 150 kilometres of HTLS lines, three GIS substations, more than 400 tower locations and more than 50 crossings under right of way constraints and complex multi package execution.
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