Featured post

What Is Fluid and Its Properties?

Science helps to understand things in a better way. We know about fluid but science helps to understand different aspects of it in a better ...

08/03/2022

Drying out of Switchgear

 

  • A 1000 V megger is used for measurement of insulation resistance, for higher rating motorized megger of 2.5 kV shall be used.
  • The switchgear equipment first dried out before it is switched when

Insulation Resistance of switchgear


Insurance Resistance

Voltage Rating

< 1 Mega ohm

Rated 1000 V

100 Mega ohm

Rated voltage above 1000 V and up to including 33 kV

1000 Mega ohm

Rated voltage above 33 kV

 

Drying out of switchgear

  • It is noted that continuously apply heat for a considerable time so as to dry out moisture. 
  • It is recommended to takes insulation resistance periodically during drying out period. 
  • It is generally found that at the beginning of drying out, moisture is redistributed. 
  • The value of insulation resistance becomes minimum after some time and stability this value for some time, after that its value increases and reaches its maximum value. 
  • This value is generally much greater than value specified in above table.
  •  The switchgear equipment is safer to put into service when the insulation resistance has been reached.

You may also like to read these articles :

What is blue hydrogen?

What is green hydrogen?

Microphone transformer

India’s Renewable Energy Generation

Types of Resolver

 


1 comment: