GIS Bays

I believe you are talking of a gas insulated substation (GIS)

To answer one question, many pressure gauges does not mean many motors get started at once.

How many motors are started depends on how many there is in the first place and what the starting logic says.

Besides the single line diagram there should be more documentation about the station. The more information you provide here and the clearer the question the better the help you can get from the people in this forum.

All the best

I am not able to upload pictures from attachment.

GIS is not supposed to require topping up or filling of gas in its life time.

The pressure gauges are provided to monitor the gas pressure and sound an alarm in case the pressure goes down to a level that is unsafe to operate.

The pressure loss to that extent could only happen if there are leaks due to improper installation etc.

Since, the leakage rate is so low and no topping up is envisaged during the life time, no automatic refilling is provided for this gas.

Moreover SF6 gas comes under 'Green house gas' category and is subject to restrictions in use and disposal due to environment concerns.

See this slide giving a few examples of how to trip on low gas pressure:

https://www.slideshare.net/ercachaq/presentation-for-seminar-fixed