Correct Answer - Option 3 : 66 kV
Switchgear:
The assembly of apparatus where we have to change the characteristics of electric power such as voltage, current, power factor, etc.
Indoor Switchgear:
- In such switchgear, the apparatus is installed within the building.
- They are usually mounted up to 11 kV because of space requirements.
- It also can be erected up to 66 kV when the surrounding atmosphere is contaminated with impurities such as metal corroding gases, fumes, conductive dust, etc.
Outdoor Switchgear:
- These are either Pole Mounted or Foundation Mounted type.
- Pole Mounted type is used for distribution of power in localities by using Single Pole or H Pole or 4-Pole structure.
- Foundation Mounted type Substation used above 250 kVA and 33 kV
Land required for different substation
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Type of Substation
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Area Required
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132 kV Substation
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10 acres
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220 kV Substation
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25 acres
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400 kV Substation
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50 acres
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High Voltage Substation (HV Substation): Involving voltage between 11 kV and 66kV.
Extra-High Voltage Substation (EHV Substation): Involving voltage between 132 kV and 400kV.
Ultra-High Voltage Substation (UHV Substation): Operating on voltage above 400 kV.
Note: A switchyard is a section of a substation where transmission or distribution lines are fed, which may contain switchgear, standalone circuit breakers, transfer switches, etc.
