LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
in General by (30.0k points)
closed by
Outdoor switchgear is generally used for voltage beyond
1. 11 kV
2. 33 kV
3. 66 kV
4. 132 kV

1 Answer

0 votes
by (54.0k points)
selected by
Best answer
Correct Answer - Option 3 : 66 kV


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

Type of Substation

Area Required

132 kV Substation

10 acres

220 kV Substation

25 acres

400 kV Substation

50 acres


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.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.