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CHAPTER-8 SWITCHYARD EQUIPMENT- HV Bus Bars, …

CHAPTER-8 . SWITCHYARD EQUIPMENT- HV Bus Bars, SWITCHYARD Structures, Isolating Switches, Current Transformers, Voltage Transformers, Lightning Arresters Introduction Outdoor step up substations at hydroelectric stations are provided to step up power at generated voltage generally for interconnection with the grid to evacuate power. Generation voltage varies from 415 volts to 11 kV (or higher) and step up voltage of small hydro up to 5 MW capacity may not exceed 36 kV. In case of large hydro stations the step up voltage may be up to 420 kV. SWITCHYARD equipment comprises of main equipment, ancillary equipment and SWITCHYARD structures. Step up transformers and circuit breakers are discussed in Section 6 & 7. Insulators SWITCHYARD structures, isolating switches current and voltage transformers and lightning arrestors are discussed in this chapter.

(Tamil Nadu Electricity Board Practice - TNEB Practice). iv) Maximum spans adjacent to stations: a) Lines rated 66 kV and above …. 152.40 m b) Lines rated 33 kV and below … 60.96 m Table 8.2: Wind Pressure & Temperature Data The table below gives the values of wind pressure and maximum and minimum temperatures specified in ...

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INDIAN INSTITUTE OF TECHNOLOGY, ROORKEE - …

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