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Which of the following points represent the essential features of switchgear? i) Complete reliability ii) Absolutely certain discrimination iii) Quick operation iv) Provision for manual control

Which of the following points represent the essential features of switchgear? i) Complete reliability ii) Absolutely certain discrimination iii) Quick operation iv) Provision for manual control Correct Answer (i), (ii), (iii) and (iv)

The essential features of switchgear are:

Complete reliability:

  • Switchgear is added to the power system to improve reliability
  • When a fault occurs on any part of the power system, it must operate to isolate the faulty section from the remaining circuit

 

Certain discrimination:

  • When a fault occurs on any section of the power system, the switchgear must be able to discriminate between the faulty section and the healthy section
  • It should isolate the faulty section from the system without affecting the healthy section
  • This will ensure continuity of supply

 

Quick operation:

  • When a fault occurs on any part of the power system, the switchgear must operate quickly so that no damage is done to generators, transformers and other equipment by the short-circuit currents
  • If the fault is not cleared quickly, it is likely to spread into healthy parts, thus endangering the complete shutdown of the system

 

Provision for manual control:

  • Switchgear must have provision for manual control
  • In case the electrical (or electronics) control fails, the necessary operation can be carried out through manual control

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